Relevant bibliographies by topics / Two gear transmission

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Two gear transmission'

Author: Grafiati
Published: 28 June 2021
Last updated: 15 February 2022

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Journal articles on the topic "Two gear transmission"

1

Liu, Lei, and Zhu Qing Huang. "Novel Torus-Involute Gear Transmission." Applied Mechanics and Materials 155-156 (February 2012): 1050–55. http://dx.doi.org/10.4028/www.scientific.net/amm.155-156.1050.

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A novel torus-involute gear transmission is presented in this paper. There are two types of tooth profiles for torus-involute gears: convex tooth and concave tooth. Torus-involute gears are non-sensitive to axial misalignments and allow variable shaft angle without meshing interference. Based on revealing of essence for tooth profiles, introducing the parameter t and discretizing this type of gear into tiny linear continuous corrected gears, a design method is proposed. To testify whether the transmission ratio of torus-involute gear transmission is constant, simulation is implemented in commercial codes ADAMS. The computed results show that this novel gear drive can achieve a constant transmission ratio with variable shaft angle.
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Ye, You Dong, and Wen Xiang Zhang. "Outer Mesh and "Two Teeth Difference" Planetary Gear Transmission Parameter Optimization Design." Advanced Materials Research 308-310 (August 2011): 2237–40. http://dx.doi.org/10.4028/www.scientific.net/amr.308-310.2237.

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Based on the structure and failure features of a new type of outer mesh and “two teeth difference” planetary gear transmission, a optimize method for the gear’s parameters is pointed out avoid of structure failure. The modification coefficients of the gear pairs are obtained through optimization design, so the sliding coefficient for the driving gear, driven gear and planetary gear tending to be equal. The relative slide between gears is reduced, and the working life of the structure is increased greatly.
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Bao, Pei De, Jun Xie, Xiao Qin Yin, Qi Zhi Yang, and Lu Zhong Ma. "Elastohydrodynamic Lubrication Design of Planetary Gear Transmission." Advanced Materials Research 228-229 (April 2011): 681–85. http://dx.doi.org/10.4028/www.scientific.net/amr.228-229.681.

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Based on elastic hydrodynamic lubrication (EHL) theory, an EHL model of the meshing between the sun gear and planet gear in planetary gear transmission was established. The EHL oil film thicknesses at meshing areas and those distributions for two operation cases were calculated: one case with the sun gear as the driving gear and another case with the ring gear as the driving gear. The Lubrication with second case was worse. Through the many comparing calculations the lubrication film thickness can be significantly increased by right parameter design. Reasonable raise of lubricant viscosity can get better gear lubrication. Increased gear pressure angle can greatly increase the oil film thickness. The increase of oil film thickness can improve the lubrication of gears and prevent wearing and reduce the production cost of gears, which have great practical value.
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Zeng, Qing Dun, and Feng Zhe Tan. "Finite Element Analysis of Gear Contact on Two-Speed Transmission in Electric Cars." Applied Mechanics and Materials 341-342 (July 2013): 443–46. http://dx.doi.org/10.4028/www.scientific.net/amm.341-342.443.

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The main content of gear design is the strength design, and the contact strength design of gears is the main heart of the strength design, because the stress and deformation of gears directly affect their safety and service life and concern whether vehicle transmissions work smoothly. Therefore it is necessary to perform a finite element analysis for the gear contact in transmission. Based on the contact characteristic of helical gears, a three-dimensional solid model was established by using the software Pro/E, and the contact stress analysis of gears was carried out by the software ANSYS Workbench. The stress and strain distribution contours of helical gears were obtained, and then the check of shtrength and rigidity was performed. Thus, it is convenient for designers both to test the strength of gears and to modify the size of gears.
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Shuai, Mo, Ma Shuai, Jin Guoguang, Gong Jiabei, Zhang Ting, and Zhu Shengping. "Design principle and modeling method of asymmetric involute internal helical gears." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 233, no. 1 (February 12, 2018): 244–55. http://dx.doi.org/10.1177/0954406218756443.

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In the field of mechanical engineering, involute helical gears are widely used. Compared with the involute spur gear, helical gears have a high bearing strength, more smooth transmission, less impact and less noise. The internal gear pairs have the features of large transmission ratio, low vibration, low noise and low wear and hence are widely used in planetary gear transmission systems. In order to meet the requirements of high strength, high speed of the modern gear transmission systems, a new type of asymmetric involute internal helical gears is designed based on conventional involute gears. This paper discusses the gear shaper cutter modeling for machining this new gear, analyzes the formation principle of asymmetric tooth profile and establishes a three-dimensional modeling by SolidWorks. Through MATLAB simulation, pressure angle, tooth number, coefficient of displacement and contact ratio of conventional and asymmetric gear are compared and analyzed. Using ANSYS, two types of gears are compared on strength in order to demonstrate superiority of asymmetric tooth and further study about the asymmetric internal helical gears.
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Luo, A. C. J., and D. O'Connor. "Impacting chatter and stick in a transmission system with two oscillators." Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics 223, no. 3 (June 16, 2009): 159–88. http://dx.doi.org/10.1243/14644193jmbd202.

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In this article, an investigation on non-linear dynamical behaviours of a transmission system with a gear pair is conducted. The transmission system is described through an impact model with a possible stick between the two gears. From the theory of discontinuous dynamical systems, the motion mechanism of impacting chatter with stick is investigated. The onset and vanishing conditions for stick motions are developed, and the condition for maintaining stick motion is obtained as well. The corresponding physical interpretation is given for a better understanding of non-linear behaviours of gear transmission systems. A parameter map is presented to provide a global picture of the relationship between system parameters and corresponding motion. Grazing and stick conditions are utilized to determine the existence of periodic motions. Such periodic motions are predicted analytically through mapping structures, and the corresponding local stability and bifurcation analyses are carried out. Numerical simulations are performed to illustrate periodic motions and stick motion criteria. A better understanding of the motion mechanism between two gears may be helpful for improving the efficiency of gear transmission systems.
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Zhu, Li Li, and Guang Xin Wang. "Distribution on Transmission Ratio of Cylindrical Gear Reducer." Advanced Materials Research 605-607 (December 2012): 1295–98. http://dx.doi.org/10.4028/www.scientific.net/amr.605-607.1295.

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The purpose of this paper is to provide two kinds of method to distribute the transmission ratio of three-stage cylindrical gear reducer. In the process, all the gears have the full contact stress in every stage. Besides, one method can also obtain the minimum volume of gear reducer and another one is to make all big gears have good flood lubrication. According to the two principles, the equations of distribution on transmission ratio and further a practical distribution graphic are examined, which have the applicable significance of actual engineering and can be the base of the distribution on transmission ratio of other kinds of gear reducer.
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Chaudhari, Neha. "Design and Analysis of an Open Differential." International Journal for Research in Applied Science and Engineering Technology 9, no. VI (June 30, 2021): 5255–63. http://dx.doi.org/10.22214/ijraset.2021.36181.

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A transmission or gearbox provides speed and torque conversions from a rotating power source to another device using gear ratios. The most common use is in motor vehicles, where the transmission adapts the output of the internal combustion engine to the drive wheels. Such engines need to operate at a relatively high rotational speed, which is inappropriate for starting, stopping, and slower travel. The transmission reduces the higher engine speed to the slower wheel speed, increasing torque in the process. We have designed a differential gearbox and tried to create the frictional contact between two mating gears. And we have performed the structural analysis on gear box by providing the torque to the assembly of crown gear and pinion gear, assembly of inner gears- spider gears and side gears and crown gear with the cage to attach spider gears. We have selected two kinds of alloy steel and have compared the factor of safety and structural analysis of the both.
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Huang, Wei, Jianfeng Huang, and Chengliang Yin. "Optimal Design and Control of a Two-Speed Planetary Gear Automatic Transmission for Electric Vehicle." Applied Sciences 10, no. 18 (September 22, 2020): 6612. http://dx.doi.org/10.3390/app10186612.

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Multispeed transmissions are helpful for improvement of the economy and drivability of electric vehicles (EVs). In this paper, we propose a two-speed transmission based on dual planetary gear mechanism, in which shifts are realized by torque transfer between two brakes located on ring gears. To synthesize the dynamic and economic performances of the vehicle, a multiobjective optimization problem is constructed for gear ratio optimization and Pareto-optimal solutions of gear ratio combinations are obtained by Nondominated sorting genetic algorithm-II (NSGA-II). In particular, the minimum electric energy consumption of the EV is calculated with a fast Dynamic Programming (DP) in each iteration. Following this, a constant-output-torque control (COTC) scheme is adopted for the torque phase and inertia phase of gearshift process to ensure constant output torque on the wheel. To enhance transient responses, the feedforward–feedback controller structure is applied and a disturbance observer is integrated to improve robustness. Simulation results demonstrate that the two-speed transmission has much better performance in terms of acceleration time and energy economy compared to the fixed-ratio transmission, and the proposed gearshift control method is able to achieve fast and smooth gear shift robustly while maintaining constant output torque.
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Yin, Jiao. "Analysis of Gear Static Transmission Error and Mesh Stiffness." Applied Mechanics and Materials 365-366 (August 2013): 327–30. http://dx.doi.org/10.4028/www.scientific.net/amm.365-366.327.

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In this paper, the object of study is one pair increasing gear with building a two-dimensional plane model in ANSYS. According to the gears meshing theory, considering the gear deformation, solve the static transmission error and the gear mesh stiffness in different conditions. The influence of the centre errors on static transmission error and mesh Stiffness are basis for modal analysis based on the mesh stiffness of gear and unbalanced harmonic response.
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Dissertations / Theses on the topic "Two gear transmission"

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Košík, Matej. "Koncepční návrh převodového ústrojí pro užití v elektromobilu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-444969.

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This diploma thesis deals with designing electric vehicle gearbox. Gearbox should serve as virtual replacement for actual transmission of VW ID.3 EV. Designed gearbox has two gears. In the first section there is an extensive search processed of drivetrain and transmission of battery electric vehicles. Next section contains choice of transmission concept and analyses solving of individual structural nodes – gear wheels, band breaks (components that engage individual gears), carriers, shaft, bearing. In the conclusion of diploma thesis, the two-gear planetary transmission is evaluated.
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Katariya, Ashish Santosh. "Dynamic modeling and feedback control with mode-shifting of a two-mode electrically variable transmission." Thesis, Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/45825.

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This thesis develops dynamic models for the two-mode FWD EVT, develops a control system based on those models that is capable of meeting driver torque demands and performing synchronous mode shifts between different EVT modes while also accommodating preferred engine operating points. The two-input two-output transmission controller proposed herein incorporates motor-generator dynamics, is based on a general state-space integral control structure, and has feedback gains determined using linear quadratic regulator (LQR) optimization. Dynamic modeling of the vehicle is categorized as dynamic modeling of the mechanical and electrical subsystems where the mechanical subsystem consists of the planetary gear sets, the transmission and the engine whereas the electrical subsystem consists of the motor-generator units and the battery pack. A discussion of load torque is also considered as part of the mechanical subsystem. With the help of these derived dynamic models, a distinction is made between dynamic output torque and steady-state output torque. The overall control system consisting of multiple subsystems such as the human driver, power management unit (PMU), friction brakes, combustion engine, transmission control unit (TCU) and motor-generator units is designed. The logic for synchronous mode shifts between different EVT modes is also detailed as part of the control system design. Finally, the thesis presents results for responses in individual operating modes, EVT mode shifting and a full UDDS drive cycle simulation.
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Wang, Hong. "MACHINE HEALTH MONITORING OF ROTOR-BEARING-GEAR TRANSMISSION SYSTEM." University of Akron / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=akron1133281063.

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Wang, Chih-Wen, and 王智汶. "Two-Dimensional Magnetostatic Field and Transmission Torque Analysis of Magnetic Gear Mechanisms." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/69809060831449002114.

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碩士
雲林科技大學
機械工程系碩士班
98
Non-contact magnetic gears have gained significant attention due to no mechanical fatigue, no lubrication, reduced maintenance, improved reliability, overload protection, physical isolation between input and output shafts, and potential for very high efficiency. The purpose of this thesis is to develop mathematical model to predict two-dimensional magnetostastic field and transmission torque of magnetic gear mechanisms. First, the literatures those are relevant to magnetic gears for the last two decades are reviewed in detail. Based on the current-sheet model, the magnetostastic fields and transmission torque of both interior and exterior magnetic gear sets are then analyzed. Finally, the finite-element analysis(FEA) is applied to assist in numerically calculating the magnetostastic field and transmission torque of magnetic gears. The errors between the analytical predictions and FEA results are also discussed.
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LI, YI-CHE, and 李宜哲. "Gear-Shift Control of a Two-Speed Clutchless Automatic Manual Transmission for Electric Vehicle." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/57f2t3.

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碩士
國立臺北科技大學
車輛工程系
107
Due to the fast and accurate response of the traction motor (TM), active speed synchronization control can be realized by controlling the speed and torque of the TM during the gear shifting process. Therefore, the clutch is no longer needed for the powertrain system. In this thesis, the vehicle longitudinal dynamics model, the powertrain system model and the synchronizer model are established for the electric vehicle equipped with a two-speed Clutchless Automated Manual Transmission (CLAMT). According to the shifting process, the equations of motion for each stage are simulated to analyze the dynamics of the vehicle during gear shift process. Such that the gear shift control strategy can be designed accordingly. The gear shift process can be divided into five processes which are torque release, gear shift to neutral, active speed synchronization, target gear engagement (mechanical synchronization), and torque recovery. A rule-based gear shift control strategy architecture is used in this thesis. Model predictive control (MPC) with the consideration of the TM dynamics is employed to control the TM speed which is during the active speed synchronization phase. Simulation results show that the dynamic response of TM has a significant impact on the jerk during the torque release and torque recovery phase. The response and overshoot of the proposed MPC are faster and smaller than those of the PI controller during the active speed synchronization process. Therefore, the time for active speed synchronization and the jerk for gear engagement are effectively reduced.
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HSU, FU BOA, and 許復堡. "Design of Gear-type Automatic Transmissions for Two-wheel Vehicles." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/31163610771291462194.

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碩士
國立中山大學
機械工程研究所
84
Gear-type automatic transmissions can provide several speed ratios by means of interengaging different elements of the gear trains and the output shaft by the centrifugal clutches, and they are widely used in mechanical systems. The purpose of this work is to develop a systematic methodology for the configurations and kinematic designs of gear-type automatic transmissions for two-wheel vehicles. First, we analyze the system and find the basic characteristics of automatic transmissions out. According to these characteristics, the design procedures for both ordinary and planetary gear systems are detablished : a caralog of automatic transmissions configurations is set up from the atlas of geared kinematic chains. Then, according to the given speed ratios, a systematic porcedure for the kinematic design of gear systems is successfully developed. The teeth numbers can easily be found by using such a procedure. Finally, we can have multi- speed transmissions by combining the ordinary and planetary gear systems and present several design examples of 4-speed and 5- speed automatic transmissions as a result of this work. The results of this work are of benefit to the design of gear-type automatic transmissions for two-wheel vehicles.
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Chang, Shan-sheng, and 張善聖. "Design of Five-Speed Gear-type Transmissions for Two Wheel Vehicles." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/e93nvq.

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碩士
國立中山大學
機械與機電工程學系研究所
95
The gear type transmissions has good performance. And it can offer the proper rotating ratio to make the dynamical system and transmission of the vehicle obtain the good match result. Apply to the transmissions of various kinds of vehicles extensively. The purpose of this research lies in the five-speed gear type transmissions. And sets up the theory of a systematized design method. The type of carrying on the transmissions by way of systematization is designed, cam mechanism to design, shifter mechanism to design and dispose overallly systematically. At first, sum up the function that the transmissions and basic characteristic to the transmissions of existing motorcycle. Set up the design specification form of the transmissions. Secondly propose a systematized designing program and carrying on the design of the gear box. And then to the gear type transmissions, cylinder cam and shifter mechanism. And carry on the innovation of handling the organization to design with movement route analytic approach and morphology matrix. Dispose overallly the five-speed gear type transmissions. Finally, set up the type picture collection of the gear type transmissions, in order to benefit the design of the motorcycle gear type transmissions. The achievement of this research contributes to the cart the innovation of the five-speed gear type transmissions designed.
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Yu-LienHuang and 黃玉蓮. "Kinematic Synthesis and Evaluation of Automatic Transmissions with Two-Degree-of-Freedom Planetary Gear Trains." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/94623168690583067151.

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博士
國立成功大學
機械工程學系碩博士班
98
This study presents a systematic method to synthesize the feasible configurations and evaluate the performances of automatic transmissions with two-degree-of-freedom planetary gear trains. The methodology includes structural synthesis of planetary gear trains, clutching sequences synthesis, clutches equipment, optimal synthesis of the number of teeth on gears, force analysis, and performances evaluation for automatic transmissions. On the structural synthesis of planetary gear trains, it is proved that the number of degrees-of-freedom of basic-type planetary gear trains is always two. Sun gears, ring gears, and planet gears are added to the kernel unit of a simple planetary gear train in sequence to construct basic-type planetary gear trains. An odd-even property matrix method is proposed to detect isomorphism and equivalences for basic-type planetary gear trains. Compound-type planetary gear trains are synthesized by link-to-link connections between two or more basic-type planetary gear trains. The connections include three types: (1) coaxial links to coaxial links, (2) planet gears to planet gears, and (3) coaxial links to planet gears. The basic-type planetary gear trains and the compound-type planetary gear trains with the first type connections are suitable for automatic transmissions. On the clutching sequences synthesis, suitable planetary gear trains are detected first. Under the functional requirement for a single clutch-to-clutch shift between speeds, a screening rule is proposed to assure that the number of coaxial links must be greater than or equal to five for a planetary gear train to be suitable for five-speed to seven-speed automatic transmissions. In order to synthesize feasible clutching sequences, based on the requirement for clutch-to-clutch shifts, a systematic algorithm is presented to classify and permute feasible shift operations. The feasible clutching sequences are obtained by combining the feasible underdrive sequences, overdrive sequences, and the operations suitable for reverse speed for automatic transmissions. In the clutches equipment aspect, coding sketches for planetary gear mechanisms are proposed for determining their coaxial-link sequences and clutch codes. According to the coaxial-link sequences, the invalid clutching sequences, which lead to interference of coaxial links while equipping clutches, are detected. According to the clutch codes, all feasible equipments of clutches for a valid clutching sequence are constructed. On the optimal synthesis of the number of teeth on gears, an exhaustive searching method is used to find the global optimum solution for the number of teeth on gears. The objective function is defined as the sum of absolute value of the difference between the generated speed ratio and the desired speed ratio of the forward speeds. Five types of constraints are considered. They are (1) constraints on the step ratios, (2) constraints on the permissible errors between the generated speed ratio and the desired speed ratio for the forward speeds, (3) constraints on the speed ratio range for the reverse speed, (4) geometric constraints for a planetary gear train, and (5) constraints on the range of the number of teeth on gears. The best seven to ten solutions are then obtained. In the force analysis aspect, considering the situation that several planet gears geared together, the modified tangent force equations, modified radial force equations, and modified equations of the x-component and y-component bearing forces for planet gears are proposed. In this study, the centrifugal force equations for planet gears are also proposed for computer programming. In the performances evaluation aspect, five items are considered. They are the objective function value in the optimal synthesis of the number of teeth on gears, the average meshing efficiency, the maximum tangent force, the maximum torque, and the volume for a planetary gear train. The evaluation function is defined as the sum of the five items normalized and multiplied by the corresponding weightings. In order to illustrate the applications for the systematic methodology mentioned above, the kinematic synthesis and evaluation for six-speed automatic transmissions is taken as an example. According to the screening rule, a two-degree-of-freedom planetary gear train, which has eight links or five coaxial links, is chosen. Six valid clutching sequences and 16 feasible clutches equipments are synthesized. After the optimal design for the number of teeth on gears, the best seven solutions for each of the two valid clutching sequences are selected for evaluation. The evaluation results from the seven solutions for each clutching sequence can be used as valuable references for designers. The systematic methodology is also applied to synthesize seven-speed automatic transmissions. A 10-link basic-type planetary gear train, which has six coaxial links, is chosen as the design target. A total of 200 valid clutching sequences are obtained, but only 27 clutching sequences have the least number of clutches, i.e., six clutches. After the optimal design for the number of teeth on gears, the best ten solutions are obtained from the clutching sequence of the planetary gear mechanism with a sun gear as the output link. The results after the efficiency evaluation for the ten solutions provide good choices for designers.
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Book chapters on the topic "Two gear transmission"

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Wei, Rui, Herong Jin, and Yali Yi. "Design and Analysis of Gear Profile of Two-Tooth Difference Swing-Rod Movable Teeth Transmission System." In Intelligent Robotics and Applications, 616–28. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-27526-6_54.

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Skvorcov, Oleg B. "Selection of Vibration Norms and Systems Structures When Designing Means of Monitoring Units with Gear Transmissions." In New Approaches to Gear Design and Production, 495–511. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-34945-5_23.

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Diestmann, Thomas, Nils Broedling, Benedict Götz, and Tobias Melz. "Surrogate Model-Based Uncertainty Quantification for a Helical Gear Pair." In Lecture Notes in Mechanical Engineering, 191–207. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-77256-7_16.

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AbstractCompetitive industrial transmission systems must perform most efficiently with reference to complex requirements and conflicting key performance indicators. This design challenge translates into a high-dimensional multi-objective optimization problem that requires complex algorithms and evaluation of computationally expensive simulations to predict physical system behavior and design robustness. Crucial for the design decision-making process is the characterization, ranking, and quantification of relevant sources of uncertainties. However, due to the strict time limits of product development loops, the overall computational burden of uncertainty quantification (UQ) may even drive state-of-the-art parallel computing resources to their limits. Efficient machine learning (ML) tools and techniques emphasizing high-fidelity simulation data-driven training will play a fundamental role in enabling UQ in the early-stage development phase.This investigation surveys UQ methods with a focus on noise, vibration, and harshness (NVH) characteristics of transmission systems. Quasi-static 3D contact dynamic simulations are performed to evaluate the static transmission error (TE) of meshing gear pairs under different loading and boundary conditions. TE indicates NVH excitation and is typically used as an objective function in the early-stage design process. The limited system size allows large-scale design of experiments (DoE) and enables numerical studies of various UQ sampling and modeling techniques where the design parameters are treated as random variables associated with tolerances from manufacturing and assembly processes. The model accuracy of generalized polynomial chaos expansion (gPC) and Gaussian process regression (GPR) is evaluated and compared. The results of the methods are discussed to conclude efficient and scalable solution procedures for robust design optimization.
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Chen, C., and J. Chen. "Power analysis of two-dof epicyclic gear transmission and experimental validation." In International Gear Conference 2014: 26th–28th August 2014, Lyon, 646–58. Elsevier, 2014. http://dx.doi.org/10.1533/9781782421955.646.

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Gutsalenko, Yuriy, and Tetyana Tretyak. "FORMATION OF WORKING SURFACES AND RESEARCH OF QUALITATIVE INDICATORS OF NON-EVOLVENT GEARS (REVIEW AND PROSPECTS OF DEVELOPMENT)." In Integration of traditional and innovation processes of development of modern science. Publishing House “Baltija Publishing”, 2020. http://dx.doi.org/10.30525/978-9934-26-021-6-35.

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From the standpoint of the development of possibilities of application in theory and practice, the works of Prof. B. A. Perepelitsa from Kharkov Polytechnic Institute and his disciples to develop an applied methodology of multiparameter mappings in relation to the profiling and functioning of complex curvilinear objects and transmission mechanisms in mechanical engineering, mainly with examples of gears, are presented. The work substantiates the relevance of the study of gears with a complex non-involute profile of the side surfaces of the teeth, which in some applications have advantages over involute gears and are devoid of some of their drawbacks associated with quality indicators. A technique for obtaining mating surfaces of the teeth of non-invasive gears as envelopes of the specified surfaces of the teeth of tools is described. A scheme for forming pairs of non-involute gears, from which a gearing can be composed, is proposed. At the same time, diamond-abrasive tools are considered as shaping the working gear profile in its cutting according to the copying scheme and finishing according to the rolling honing scheme. In the first case, the profile of a special shaped tool on a high-strength metal bond is supported by a master electrode according to the scheme of the anodic connection of the tool into the electric circuit of dressing, similar to diamond spark grinding. In the second case, the use of gear wheels-hones on elastic ligaments is shown. It is shown that to obtain the mating surfaces of the teeth of two non-involute gears, two tool rails can be used with the profiles of the side surfaces of the teeth opposite to each other. As a nonlinear profile of the tooth lateral surface of the tool rail, some part of one of the simulated flat kinematic curves is considered. A description of the program developed in accordance with the described method is given, which allows you to calculate the geometric characteristics of the shaped profiles of the gear pair wheels, visualize the shaping process, and also determine the quality indicators of the gearing. Thus, the prerequisites were created for choosing from the resulting geometric modeling of the curve field of such tooth profiles of the tools, which would provide the most rational combination of the tooth profiles of the gears processed by them and the required quality parameters of the gear teeth. The results of the study of the pressure ratio between the teeth of a gear and the overlap ratio of gears when choosing the shape of the tooth profiles are presented. A series of numerical experiments for gearing, formed by pairs of tool rails with different profiles of the side surfaces of the teeth straight, convex and concave, as well as convex-concave were performed. It is shown that non-involute gearing can have large reduced radii of curvature (and consequently smaller pressure coefficients) at the points of tangency of the profiles compared to involute gearing with a slight increase or decrease in the gearing overlap ratio. The most preferable is the variant of the rails with convex and concave tooth profiles, which provides the best values of both quality indicators of the engagement.
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Nagumo, T., M. Ishizuka, Y. Satou, S. Matsumura, and H. Houjoh. "Estimation of loaded static transmission error using vibration measurement under operating conditions in a two-stage helical gear reducer." In International Conference on Gears 2017, 857–68. VDI Verlag, 2017. http://dx.doi.org/10.51202/9783181022948-857.

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Kumar, Ashwani, Yatika Gori, and Pravin P. Patil. "Finite Element Analysis-Based Thermo-Mechanical Performance Study of Heavy Vehicle Medium Duty Transmission Gearbox." In Handbook of Research on Advancements in Manufacturing, Materials, and Mechanical Engineering, 322–36. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-4939-1.ch015.

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The main objective of this chapter is to investigate the performance of automobile transmission gearbox under the influence of load, rotational speed, and lubrication on multi speed gearbox gear surface. Gear oil SAE 80W-90 was used as gearbox lubricant, for cooling of transmission gearbox for high performance. An assumption has been made at the air-gear oil mist within transmission is under steady state condition, in isothermal equilibrium with the transmission gear oil bath of lubricant. The lubrication in multi speed transmission is subjected to thermo-elastohydrodynamic lubrication. The present chapter deals with the thermo-mechanical performance study of multi speed transmission (4 speed, excluding reverse gear) system, which combines transient structure analysis of the gear train assembly. The engaged gear teeth pairs transmit torque subjected to thermo-elastohydrodynamic arrangements of lubrication. The study here analyzed transmission in second gear pair.
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Viehmann, A., R. König, and S. Rinderknecht. "Investigation of gear shifts in a parallel-series hybrid powertrain with dog clutches in a demonstrator vehicle (two-drive-transmission with range-extender, DE-REX)." In Dritev – Drivetrain For Vehicles 2018, I—323—I—346. VDI Verlag, 2018. http://dx.doi.org/10.51202/9783181023280-i-323.

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Kumar, Ashwani. "Low to High Speed Transient Structural and Thermal Temperature Measurement of Oil-Lubricated Multi-Speed Heavy Vehicle Transmission Gearbox System Based on FEA." In Advanced Numerical Simulations in Mechanical Engineering, 1–21. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-3722-9.ch001.

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The main objective of this chapter is dynamic structural and thermal analysis of multi speed transmission gearbox (medium duty truck) using Finite Element Analysis (FEA). To evaluate the dynamic strength of transmission gearbox assembly transient structural analysis was performed. Dynamic varying loads at different rotational speed were applied to perform the transient analysis. In gear meshing operation at high rotational speed and loading condition, frictional heat is generated inside gearbox assembly. To reduce the effect of frictional heat, gear oil is used. In this research study gear oil SAE 85W140 was used for cooling and performance enhancement. Steady state thermal analysis was performed to evaluate the thermal effect of frictional heat, rotational speed of shafts (pinion, gear) and load with gear oil lubrication. In thermal effect gearbox surface temperature was measured at different points. FEA simulation results have been validated using experimental results available in literature.
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Hegger, C., T. Kruger, and J. Maas. "Two-speed transmission based on energy-efficient MRF-coupling elements and power split mechanism." In International Conference on Gears 2019, 867–76. VDI Verlag, 2019. http://dx.doi.org/10.51202/9783181023556-867.

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Conference papers on the topic "Two gear transmission"

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Macyszyn, Łukasz, Adam Myszkowski, Roman Staniek, and Stanisław Pabiszczak. "Two-Stage Precession Type Gear: Design, Geometric and Kinematic Analysis." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-70525.

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The paper presents the theoretical bases, design and the principle of operation of two-stage precession type transmission with face meshing. Description and the principle of forming the face meshing which is modified by the original method have been shown as well. Dimensional relations between particular components of the gears are established and the analysis of optimal gear ratio, depending on the number of teeth or magnets on the circumferences of meshing gear wheels is also provided in the paper. For further analysis four prototypes of mechanical precession transmission with face meshing were designed, built and investigated. Those prototypes present different sizes, reduction ratio and precession angle. Investigations, described in the paper, helped to determine the gear efficiency rate as well as the maximal torque that could be transferred for the given rotary speed. This paper presents also the conception of the design of a novel double stage precession magnetic gear with face neodymium magnets. The results of the initial studies are the background of the further research in the field of magnetic precession type transmission.
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Henriksson, Mats, and Yuet-Yan Pang. "Transmission Error as Gear Noise Excitation." In ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/detc2009-86695.

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Traditionally, transmission error (TE) has been used in order to asses the noise properties of gears. Measurements of gear noise for a complete truck gearbox have been used to correlate noise from a gear pair with the concept of calculated static transmission error as noise excitation. Two gear pairs with very similar macro geometry but different micro geometry was used. Both transmission error as excitation and the excitation proposed by P. Velex and M. Ajmi which is the difference between the loaded and unloaded transmission error, are compared with measured noise. The result shows that the difference between the loaded and unloaded TE correlates well with measure noise for gear pair A but no excitation correlates with the measurement result gear pair B. A big difference between gear pair A and B can be seen in the contact pattern. The contact pattern of gear pair B shows that despite a large tip relief, edge contact occurs where the tip relief starts. This can be one explanation to the lack of correlation between TE and the measurement result for gear pair B. Another explanation can be other excitations such as friction and bending moments. The results show the limitations of only considering transmission error when designing quiet gears.
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Azzouz, Salim, and Guy Bernard. "A Gear-Chain Based Transmission for the Machine Elements Design Laboratory." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-87107.

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This project describes the collaboration of two instructors, one from the mechanical engineering department and one from the mathematics department with a group of mechanical engineering students to build and analyze a new type of transportation transmission. Current transmissions have torque limitations when working at various vehicle loading conditions. The ideal vehicle transmission is a continuously variable transmission that delivers optimum torque at any loading condition. The motivation for this research project is to design a new transmission that would increase the number of gear ratios using a chain element, and consequentially, increasing the number of available torques to achieve better overall vehicle performance. The new transmission consists of two planetary gears systems linked by a chain. It includes multiple inputs and outputs with the possibility of using one of the outputs to drive other engine components. The system is currently investigated for all possible gear ratios and usable torque configurations. The gear ratios are determined using Willis’s formula for planetary gear systems. All possible gear combinations are investigated and their gear ratios mathematically determined. A prototype was designed and built. It is being automatized, currently.
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Mairal, Aditya A., Akash B. Pandey, and Jimil M. Shah. "Embedded Controller Based Automatic Gear Change Mechanism for Two Wheeled Manual Transmission Motorcycle." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-68127.

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For the vehicle to move forward the engine has to be connected to driving wheels so as to propel the vehicle. The engine rotates at relatively high speeds, while the wheels are required to turn at slower speeds. The torque requirements of the vehicle vary as per the prevailing conditions of load, terrain etc. Gear box provides different gear ratios between the engine and the driving wheels, to suit the varying road conditions such as when climbing hills, traversing rough road or sandy road or pulling a load. The required gear shift for providing varying torque requirements can be obtained either manually or automatically. Automatic gear shifting mechanism is a concept implementing an embedded control system for actuating the gears automatically without human intervention. The automation is achieved by using a microcontroller and suitable sensor and actuator hardware. Whenever the speed of the vehicle increases or decreases beyond a pre-defined set of values, the microcontroller based control system actuates the clutch as well as the gear and helps maintain a steady operation of the automobile. The concept of automatic gear change is applied in this work to a 4-stroke, manual transmission motorcycle. The clutch is actuated by means of a DC Motor actuated mechanism and gear lever is actuated by means of the spring loaded solenoid actuator, both controlled by a microcontroller based circuit, programmed to read the signals from an inductive proximity sensor which senses the actual speed of the wheel. The system design and development is described in this paper with control circuit and control logic.
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Mairal, Aditya A., Akash B. Pandey, and Jimil M. Shah. "Embedded Controller Based Automatic Gear Change Mechanism for Two Wheeled Manual Transmission Motorcycle." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-68128.

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For the vehicle to move forward, the engine has to be connected to driving wheels so as to propel the vehicle. The engine rotates at relatively high speeds, while the wheels are required to turn at slower speeds. The torque requirements of the vehicle vary as per the prevailing conditions of load, terrain etc. Gear box provides different gear ratios between the engine and the driving wheels, to suit the varying road conditions such as when climbing hills, traversing rough road, moving on sandy road or pulling a load. The required gear shift for providing varying torque requirements can be obtained either manually or automatically. Automatic gear shifting mechanism is a concept implementing an embedded control system for actuating the gears automatically without human intervention. The automation is achieved by using a microcontroller and suitable sensor and actuator hardware. Whenever the speed of the vehicle increases or decreases beyond a pre-defined set of values, the microcontroller based control system actuates the clutch as well as the gear and helps maintain a steady operation of the automobile. The concept of automatic gear change is applied in this work to a 4-stroke, manual transmission motorcycle. The clutch is actuated by means of a DC Motor actuated mechanism and gear lever is actuated by means of the spring loaded solenoid actuator, both controlled by a microcontroller based circuit, programmed to read the signals from an inductive proximity sensor which senses the actual speed of the wheel. The system design and development is described in this paper with control circuit and control logic.
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Roda-Casanova, Victor, Jose L. Iserte-Vilar, Francisco Sanchez-Marin, Alfonso Fuentes-Aznar, and Ignacio Gonzalez-Perez. "Development and Comparison of Shaft-Gear Models for the Computation of Gear Misalignments due to Power Transmission." In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-47895.

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Gear misalignments cause transmission errors, the shift of the bearing contact and may reduce substantially the life of gears. Some gear misalignments are caused directly by shafts misalignments but others are mainly related with the torque transmission and shaft bending. Even for perfectly aligned gear drives, shaft bending due to power transmission causes the shifting of the bearing contact towards the edge of the gear tooth surfaces for those non-modified gear drives with theoretical lineal contact. In this paper, four different models (two based on the Bernoulli’s beam theory and two based on the finite element method) have been proposed for shaft and gear modeling in order to estimate misalignments of gears due to power transmission in a conventional spur gear transmission. The influence of transmitted torque, length of shafts and relative position of gears over the shafts on the errors of alignment has been investigated.
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Guan, Peng, and Hans DeSmidt. "Parametric Instability of Planetary Gear Transmission Mounted on Discrete Support Struts With Minimum Ring Gear Rim Thickness Design." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-87220.

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This research explores parametric instabilities of the PGT driveline system and a stability-based method for ring gear rim thickness design. Parametric excitation of a planetary gear transmission (PGT) driveline system arises from two sources: 1) gear mesh stiffness variation, 2) Interaction between moving planets, flexible ring gear and boundary struts. Many researchers have studied the parametric instability of planetary gear transmissions due to gear mesh stiffness variation, however, the effect of interaction between moving planets, flexible ring and discrete boundary struts on parametric instabilities has not been fully studied before. Especially, for sufficiently thin ring gears, this kind of effect becomes even more significant. To illustrate the novel PGT rim design proposal, firstly, a structural dynamics model of a complete PGT driveline system with elastic ring gear supported by discrete boundary struts is established. Secondly, by applying Floquet method, the parametric instability behavior due to the second parametric excitation source is fully investigated. Lastly, the design guidelines for planetary gear transmission ring gear rim thickness are proposed based on system stability from a dynamical viewpoint. The analysis and results provide new and important insights into dynamics and design of lightweight planetary gear transmission ring gear rim.
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Hebbale, Kumar, Dongxu Li, Jing Zhou, Chengwu Duan, Chi-Kuan Kao, Farzad Samie, Chunhao Lee, and Robert Gonzales. "Study of a Non-Circular Gear Infinitely Variable Transmission." In ASME 2014 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/dscc2014-6083.

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Improving automobile fuel efficiency is an important research and development effort in the automotive industry. In the transmission area, it is generally understood that optimum fuel economy can be achieved via a combination of highly efficient power transfer (gears, for example) and an ability to transmit power at an infinite number of ratios (CVT, for example). In this paper, a geared infinitely variable transmission (IVT) is analyzed for efficiency through static analysis. This IVT is based on a non-circular gear concept described in [1, 2]. This IVT consists of multiple function generators with each function generator comprising two sets of non-circular gear sets whose outputs are combined with a summing planetary gear set. Each function generator provides the desired gear ratio for only a part of the driving rotation. So, multiple function generators are combined along with multiple one-way clutches to provide an infinitely variable transmission. This paper first explains the operating principle of the geared IVT. A static analysis of the IVT powerflow is derived and it is shown that this powerflow exhibits a torque recirculation phenomenon, which is not desired. This recirculation phenomenon is expected to be present in all similarly arranged IVTs where two inputs are combined using a planetary gear set to provide infinite gear ratio capability. The efficiency of the IVT is calculated based on assumed individual component efficiency and it is shown that, owing to torque recirculation, the efficiency of this transmission may not compare well with that of current automatic transmissions for a passenger car application.
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Yang, Guanlong, Ling Su, ZhongHua Li, Jie Liu, and Xueyong Tian. "The Feasible Research of Electric Vehicle by Using Two-gear Transmission." In 6th International Conference on Information Engineering for Mechanics and Materials. Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/icimm-16.2016.17.

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Binney, David A., Harsh Vinayak, Yuiry Gmirya, Lawrence M. Zunski, D. R. Houser, and E. C. Ames. "Face Gear Transmission Development Program at Sikorsky Aircraft." In ASME 2003 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/detc2003/ptg-48039.

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Sikorsky Aircraft, under a cooperative agreement with AATD (Aviation Applied Technology Directorate), has launched a four-year program, RDS-21 (Rotorcraft Drive Systems for the 21st Century), to develop face gear transmissions. RDS-21 addresses key technologies needed to enhance the drive systems of the objective force aircraft while developing new technologies to support the development of a new face gear drive system for Unmanned Air Vehicles (UAV) and the Future Utility Rotorcraft (FUR). Some of the initial funding for face gear development came from a partnership with Army MANTECH. This paper presents an overview of the RDS-21 face gear program and summarizes major milestones achieved to-date. Sikorsky has pursued face gear technologies by partnering with two key institutions. The GearLab at The Ohio State University has developed face gear analysis and design software while the other partner, Gleason Pfauter Inc., has developed face gear manufacturing technology. The methods developed for the design and analysis of face gears and some of the results of their application are covered in this paper. A mathematical model of the face gear generation process is created. The model facilitates the calculation of quantities of interest such as sliding velocities and contact ratio. Digital master gears are created for inspection purposes. A gear analysis software package is used to compute the loads and stresses in the gears. Work is continuing at The Ohio State University to create proprietary face gear analysis software for Sikorsky that can quickly run many design configurations.
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