Статті в журналах: "Roller gear"

1

Lisowski, Filip, and Jan Ryś. "A Methodology of Designing the Teeth Conjugation in a Planetary Roller Screw." Archive of Mechanical Engineering 63, no. 4 (December 1, 2016): 589–603. http://dx.doi.org/10.1515/meceng-2016-0033.

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Abstract The paper presents the methodology for designing the teeth conjunction of planetary gears in the planetary roller screw mechanism. A function of the planetary gears is to synchronize an operation of rollers in order to avoid axial displacements. A condition of the correct operation is no axial movement of rollers in relation to the nut. The planetary gears are integral parts of rollers and therefore an operation of the gear transmissions has a direct impact on cooperation of the screw, rollers and the nut. The proper design of gear engagements is essential for reducing slippage on surfaces of the cooperating threaded elements. For this purpose, in a designing method, both the limitations of operation and kinematic conditions of rollers’ operation have to be taken into account.

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2

SHEU, Kuen-Bao, and Ta-Shi LAI. "KINEMATIC ANALYSIS OF ROLLER DRIVES." Transactions of the Canadian Society for Mechanical Engineering 27, no. 4 (December 2004): 401–15. http://dx.doi.org/10.1139/tcsme-2003-0023.

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The roller drive is an epicyclic gearing that consists of both the planet gear and the annular sun gear with rollers as its teeth. The roller drive thus has the advantages of easy manufacturing and low cost, and also has attractive attributes including high speed reduction ratio, compact size, and light weight as an epicyclic gearing. In this paper, a mathematical modeling for the kinematic analysis based on the vector loop approach is developed. The position, velocity, and acceleration analyses for the roller drive are performed. Furthermore, an experimental test verifying the analysis results is achieved. The analysis results show that only a single pair of teeth is meshed during gearing. It also shows that the values of gear ratio are inherently fluctuated corresponding with the number of ring gear rollers. This undesirable fluctuation can be minimized if the selected values of the design parameters satisfy a specific four-linkage constraint.

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3

Kwon, Soon-Man. "Roller Track Gear System Design based on Roller Gear Mechanism." Journal of manufacturing engineering & technology 23, no. 2 (April 15, 2014): 194–98. http://dx.doi.org/10.7735/ksmte.2014.23.2.194.

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4

Qin, Lei, Yan Ting Ma, and Chang Jie Luo. "Optimization Study on the Tooth Profile of Gear Shaping Roller of Honeycomb Semi-Cell Structures." Applied Mechanics and Materials 423-426 (September 2013): 972–77. http://dx.doi.org/10.4028/www.scientific.net/amm.423-426.972.

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In order to solve the problem of low accuracy of honeycomb semi-cell structures which are rolled by traditional trapezoidal tooth profile gear shaping rollers, conjugate trapezoidal tooth profile gear shaping rollers have been put forward to improve the quality of honeycomb semi-cell structures, basing on the theoretical analysis. Using ANSYS/LS-DYNA, a finite element model of rolling aluminum foils by two kinds of tooth profile shaping rollers was set up. Then results of numerical simulation indicate that the honeycomb semi-cell structures rolled by the conjugate trapezoidal gear shaping rollers are closer to the ideal size than those rolled by the traditional trapezoidal gear shaping rollers.

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5

Tsay, D. M., N. J. Huang, and B. J. Lin. "Geometric Design of Roller Gear Cam Reducers." Journal of Mechanical Design 121, no. 1 (March 1, 1999): 172–75. http://dx.doi.org/10.1115/1.2829420.

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A roller gear cam. reducer, composed of a turret with rollers and a globoidal cam, is often used to provide high positioning precision at low cost. In this study, a simple procedure is given to generate the surface of the cam without solving any contact equations. The method is based on rigid body transformations between the cam and the turret roller. Analyses of the pressure angle and the principal curvature of the surface geometry are also accomplished. In addition, contact forces between the roller and cam, input torque, and the reducer efficiency are evaluated. An example of the procedure is given.

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6

Dai, Zih-Chun. "Stresses Analysis of Roller Gear Drive." Journal of Physics: Conference Series 2141, no. 1 (December 1, 2021): 012001. http://dx.doi.org/10.1088/1742-6596/2141/1/012001.

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Abstract The roller worm gear drives have been widely adopted in numerous industrial applications such as robot joint reducer, heavy-duty production line. This study is to improve the performance of a roller gear drive by utilizing an iterative optimization scheme to improve the tooth profile of the hourglass worm gear in the roller gear drive. Dedicated design of the variable-pitch slot on the hourglass worm gear can remedy the power efficiency of the roller gear drive by enhancing the contact ratio dramatically. This research showed that the roller gear drive is a better mechanism for the high reduction ratio reducers. The CAD design and performance analysis of a roller gear drive by SolidWorks have provided the engineers an optimizing methodology.

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7

Лустенков, М. Е., Mihail Lustenkov, Екатерина Лустенкова, and :Ekaterina Lustenkova. "SPHERICAL ROLLER GEAR WITH DOUBLE-ROW PINION: POWER COMPUTATIONS AND PERFORMANCE COMPUTATION." Bulletin of Bryansk state technical university 2019, no. 5 (June 4, 2019): 32–43. http://dx.doi.org/10.30987/article_5cda64cd19bec2.74771159.

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The dependences of forces affecting basic elements of spherical roller gears with a double-row pinion from engagement parameters and friction coefficients are defined. The power dependences obtained allow estimating spherical roller gear (SRG) elements loading and defining optimum values of basic sphere radii and center profile amplitudes at a specified reduction ratio according to the criterion of minimum power loss in an engagement. It is defined that the performance of the SRG with the double-row pinions is comparable with the performance of planetary gear drives with two-ring gear pinions. For SRGs it depends in the inverse proportion upon a reduction ratio and increases with the increase of the roller number difference (periods of center profiles) in two rows. The SRG performance decreases considerably at friction constant increase as in worm gears. The analysis carried out confirmed the equivalence of two power circuits of gear according to the criterion of maximum output capability. The tests of the reducer experimental sample with SRG have confirmed kinematic and power dependences defined theoretically.

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8

Cao, Ju Jiang, Cheng Guo Feng, and Lei Zhang. "Finite Element Analysis of Multi-Roller Contact Roller-Gear Cam Reducer." Applied Mechanics and Materials 271-272 (December 2012): 917–21. http://dx.doi.org/10.4028/www.scientific.net/amm.271-272.917.

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This paper presents the multi-roller contact roller-gear cam reducer. It’s a special kind of the indexing roller-gear cam that changes the stopping stage of the indexing cam to zero and chooses the equal-velocity law. And with multi-roller contact the carrying capacity is greatly improved. In this paper, we created the 3D solid model of the main components of the reducer: the cam, the turntable and the rollers. After that, we used the FEA software ANSYS Workbench to calculate the static structural behavior and the results showed us the weak or dangerous part of the mechanism so that we can optimize the structural. However the static structural behavior does not always shows the working condition. Thus we calculated the flexible dynamic behavior of the reducer and it showed us vividly that which part is weak and we could see the real deformation and stress distribution of the structural while working. Then we can pay more attention to these parts.

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9

Hua, Xia, and Zaigang Chen. "Effect of roller bearing elasticity on spiral bevel gear dynamics." Advances in Mechanical Engineering 12, no. 7 (July 2020): 168781402093889. http://dx.doi.org/10.1177/1687814020938895.

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The dynamics of spiral bevel gears have gained increasing importance due to concerns relating to noise and durability. This is because the mesh force acting on the gear teeth is amplified under dynamic conditions, potentially reducing the fatigue life of the gears. Furthermore, a sizable dynamic force can be transmitted to the housing, inducing structure-born gear whine. The elasticity of the bearings can influence the dynamics of spiral bevel gears. In this article, the finite element formulation of a spiral bevel geared rotor dynamic system is applied to investigate the influence of bearing elasticity on the dynamics of spiral bevel gears. The designs and configurations of rear axles are modeled and analyzed for real-world applications, to gain an enhanced practical understanding of the effect of bearing stiffness on spiral bevel gear dynamics.

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10

Shen, Yun De, Guang Ma, Tai Hong Cheng, and Yong Li. "Modal Analyses of Rotating Gears for Compound Oscillatory Roller Transmission Gearbox." Advanced Materials Research 718-720 (July 2013): 1663–66. http://dx.doi.org/10.4028/www.scientific.net/amr.718-720.1663.

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The pre-stressed modal properties of planetary gears of compound oscillatory roller transmission gear reducer considering the external torque and rotating angular velocity were calculated in this work. For the boundary conditions, the large torque was considered to output gear and angular velocity for applying to middle gear. The resonant frequencies of output gear under external torque were a little higher than the case of no external loads, because the stiffness of gear will be changed with external loads. But the resonant frequencies of middle gear show the no changes under rotating angular velocity, because the low angular velocity and no stiffness change with structure of gear. Finally from the cambell diagram, the calculated resonant frequencies were in the range of safety.

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11

Hong-Sen, Yan, and Chen Hsin-Hung. "Geometry design of roller gear cams with hyperboloid rollers." Mathematical and Computer Modelling 22, no. 8 (October 1995): 107–17. http://dx.doi.org/10.1016/0895-7177(95)00160-4.

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12

Bai, S., and J. Angeles. "The design of spherical multilobe-cam mechanisms." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 223, no. 2 (February 1, 2009): 473–82. http://dx.doi.org/10.1243/09544062jmes1154.

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Cam—roller mechanisms can be used in transmissions and robotic devices as an alternative to their bevel-gear counterparts. As bevel gears are used to couple shafts of intersecting axes, their cam-mechanism replacements are bound to have intersecting axes as well. This means that the contact surface of the cam must be conical, which leads to spherical cam mechanisms. Compared with gear transmissions, cam—roller mechanisms feature low friction, low backlash, and high strength. However, cam mechanisms may end up with a high pressure angle if negative action, a motion in which the cam is driven by mechanism rollers, occurs. This article reports the design of transmissions with spherical multilobe cams (MLCs), as a means to reduce the pressure angle. The kinematics of MLC, including profile generation, undercutting-avoidance, and transmission-quality evaluation, is studied here. A case study has been included, in which the synthesis of a spherical MLC transmission is undertaken as a means to improve the transmission quality of a spherical epicyclic gear train. This train was introduced with the purpose of producing a singularity-free, unlimited-workspace pitch—roll wrist.

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13

Wei, Yan Gang, and Wu Chu Tang. "The Edge Effect and Longitudinal Modification of Involute Gear Drive Used in Automobile." Applied Mechanics and Materials 367 (August 2013): 136–40. http://dx.doi.org/10.4028/www.scientific.net/amm.367.136.

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Via combining parameterized modeling function of Pro/E with gear mesh principle, the accurate 3-D crowning modification models of involute gears used in automobile are made. The edge effect in meshing process of the gear pair is validated by finite element method. The longitudinal corrections of a gear pair are designed combining crowning technology of roller bearings with the characteristic of gear mesh and using gear mesh principle and contact mechanics theory. Then it is testified by FEA that the maximum stresses of the gears can be reduced effectively since longitudinal correction can avoid the edge effect in the meshing process of the gear pair.

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14

Lu, Fengxia, Meng Wang, Wenbin Pan, Heyun Bao, and Wenchang Ge. "CFD-Based Investigation of Lubrication and Temperature Characteristics of an Intermediate Gearbox with Splash Lubrication." Applied Sciences 11, no. 1 (December 31, 2020): 352. http://dx.doi.org/10.3390/app11010352.

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In this study, we propose a computational fluid dynamics (CFD)-based method to study the lubrication and temperature characteristics of an intermediate gearbox with splash lubrication. A volume of fluid (VOF) multiphase model was used to track the interface between oil and air. A multiple reference frame (MRF) model was adopted to accurately simulate the movement characteristics of the gears, bearings, and the surrounding flow field. The thermal-fluid coupling computational model of an intermediate gearbox with splash lubrication was then established. Combined with experimental results, we verified that the lubricating oil temperature was below the limit requirement (<110 °C). The numerical results revealed that large amounts of lubricating oil were splashed onto the tooth surfaces near the gear meshing area. A large convective heat transfer coefficient corresponds to a low gear tooth surface temperature. The tooth surface temperature of the driving gear is higher than that of the driven gear. The distribution law of oil volume fraction of the bearing roller was jointly affected by the roller rotation direction and gravity. The convective heat transfer coefficient of the roller wall was largely related to the lubrication environment of the roller, including the oil distribution inside the bearing cavity and the flow rate.

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15

Wu, Tao, Guangchun Wang, Jin Li, and Ke Yan. "Investigation on gear rolling process using conical gear rollers and design method of the conical gear roller." Journal of Materials Processing Technology 259 (September 2018): 141–49. http://dx.doi.org/10.1016/j.jmatprotec.2018.04.034.

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16

Phuc, Nguyen Thien. "Planetary cycloid roller gear reducer." Vietnam Journal of Mechanics 24, no. 2 (June 30, 2002): 115–22. http://dx.doi.org/10.15625/0866-7136/24/2/6613.

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In this paper we present some results of the shaping tooth profile and the method of the relationships between gear parameters and of the analysis for properties of the planetary cycloid roller gear reducer.

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17

Gong, Qing Shan, Min Luo, and Yue Min Wu. "A Rapid Measuring Method for Roller Gear Cam Center Distance Error." Applied Mechanics and Materials 697 (November 2014): 356–59. http://dx.doi.org/10.4028/www.scientific.net/amm.697.356.

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For the complexity of its space surface,the rapid measuring technology of machining errors for roller gear cam has always been a difficulty.In this paper, the NC machining technology of roller gear cam is introduced first, then a rapid measuring method for roller gear cam center distance error is put forward,and a error analysis model is established, last the machining experiment is done to verify the feasibility of the method.

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18

Jang, Si Youl, and Wan Choi. "A Study on the Contact Behaviors of Infinitely Variable Transmission System with Full Toroidal Shapes of Disks." Key Engineering Materials 297-300 (November 2005): 351–56. http://dx.doi.org/10.4028/www.scientific.net/kem.297-300.351.

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The torque of the continuously variable transmission system with friction drive mechanism is transmitted by contacting roller with input and output disks. For the higher transmitted torque, it is necessary to apply large load in order to get higher friction force, which in turn generates severe high stress on the contact surfaces of roller and disks. The toroidal type CVT system has simple component arrays that have three contact points between roller and each input or output disk to get the torque transmitted. However, compact assembly design of the three sets of rollers contacting with input and output disks needs the roller to stay with unsymmetrical angled position with each other. Therefore, the contact shapes between roller and disk vary according to the transmission ratio and should be investigated to avoid the excessive contact stress over than ~1.8 GPa. In this study, the contact geometries of roller and disks in the toroidal type CVT system are computed during the gear ratios. The contact area of which the size depends on the material elasticity, curvatures of roller and disk, and applied load are all of elliptic shapes because of the convex and concave curvatures of roller and disk shapes, respectively. From the computed results considering the size of roller diameter, roller stroke and applied load, it is found that the shapes of contact area changes the sizes of major and minor elliptical diameters in the rolling direction during the gear ratios due to the unsymmetrical angled position of roller.

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19

Zhang, Yong Qi, Qing Chang Tan, Jian Gang Li, and Kuo Zhang. "Fatigue Life of Taper Roller Bearings in Drive Rear Axle Main Gear Reducer." Advanced Materials Research 510 (April 2012): 112–16. http://dx.doi.org/10.4028/www.scientific.net/amr.510.112.

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Taper roller bearings are important parts of drive rear axle main gear reducers, and their work property affect behavior of the reducers.The roller bearings are obtained under applied load and inertia force that affects both meshing contact of the gears and raceways of the bearings. The influence is analyzed in this paper to improve the service life of the roller bearings by finite element method in this work. Firstly, a finite element model of roller bearings is established.Stress fields in the roller and the raceway are calculated by adding load and solving. Then,obtaining the maximum stress of the bearings, and the maximum stressand displaced shape are showed. Finally, the fatigue life of the bearings are analyzed by the obtained the maximum stress .

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20

Nachimowicz, Jerzy, and Stanisław Rafałowski. "Modelling the Meshing of Cycloidal Gears." Acta Mechanica et Automatica 10, no. 2 (June 1, 2016): 137–40. http://dx.doi.org/10.1515/ama-2016-0022.

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Abstract Cycloidal drives belong to the group of planetary gear drives. The article presents the process of modelling a cycloidal gear. The full profile of the planetary gear is determined from the following parameters: ratio of the drive, eccentricity value, the equidistant (ring gear roller radius), epicycloid reduction ratio, roller placement diameter in the ring gear. Joong-Ho Shin’s and Soon-Man Kwon’s article (Shin and Know, 2006) was used to determine the profile outline of the cycloidal planetary gear lobes. The result was a scatter chart with smooth lines and markers, presenting the full outline of the cycloidal gear.

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21

Yan, Hong-Sen, and Hsin-Hung Chen. "Geometry design and machining of roller gear cams with cylindrical rollers." Mechanism and Machine Theory 29, no. 6 (August 1994): 803–12. http://dx.doi.org/10.1016/0094-114x(94)90079-5.

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22

CHEN, Shang-Liang, and Shih-Fong HONG. "Surface Generation and Fabrication of Roller Gear Cam with Spherical Rollers." Journal of Advanced Mechanical Design, Systems, and Manufacturing 2, no. 3 (2008): 290–302. http://dx.doi.org/10.1299/jamdsm.2.290.

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23

Gong, Qing Shan, Yue Min Wu, Shan Shan Liu, and Hong Xun Zhou. "Parametric Design and Kinematics Simulation of the Roller Gear Indexing Cam Mechanism." Applied Mechanics and Materials 722 (December 2014): 112–15. http://dx.doi.org/10.4028/www.scientific.net/amm.722.112.

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The working profile of the roller gear indexing cam is sophisticated space curved surface. It is difficult to get the 3D model with conventional cartography. In this paper, a parameter molding method of the roller gear indexing cam based on VB and UG is provided. A system is compiled.The Simulation and Kinematics Analysis of the roller gear indexing cam mechanism can be done after the parameters are completely set. It hopes that the flaw and other problem in design can be found though this simulation and kinematics analysis, which is facilitate the designer to improve the design in time.

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24

Liu, Yan Song, and Wei He. "The Study on Dynamic Simulation of the Roller Gear Indexing Cam." Advanced Materials Research 503-504 (April 2012): 44–47. http://dx.doi.org/10.4028/www.scientific.net/amr.503-504.44.

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The roller gear indexing cam has irreplaceable superiority in the high-accuracy and high-speed indexing motion, but it can not keep the system’s good dynamic characteristics to improve machining accuracy of cam only. This paper studies the dynamic simulation of the roller gear indexing cam by means of virtual prototype technology, rigid multi-body dynamics, and contact mechanics, and the influences of this system’s parameters on dynamic responds of the mechanism. These works are valuable for designers, makers and users to optimal design, test, and make the mechanism, and give a new method for studying dynamics of roller gear indexing cam.

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25

Abdukarimov, A., A. Abdullajonov, and A. Abdukarimov. "Kinematics of the transmission gear mechanism for roller machines with different diameters of drive shaft." IOP Conference Series: Materials Science and Engineering 1182, no. 1 (October 1, 2021): 012002. http://dx.doi.org/10.1088/1757-899x/1182/1/012002.

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Abstract The article describes the arrangement, principle of operation and kinematic analysis of a ten-link gear-lever differential transmission mechanism with a parallelogram lever contour for roller machines with different diameters of the working shafts. The purpose of the kinematic analysis of the transmission mechanism is to determine the velocities and accelerations of the mechanism links, the gear ratio of the mechanism, and to show the constancy of the gear ratio of the transmission mechanism when the center distance of the driving and driven tooth gears changes. An important condition for the normal operation of roller machines with different diameters of the working shafts is the coincidence of the gear ratio of the working shafts and the gear ratio of the transmission mechanism between these shafts. Initially, the kinematics of the mechanism was performed using the analytical method. In the analytical study of the mechanism, the centroid method was used. Dependencies for determining the kinematic parameters of the ten-link gear-lever transmission mechanism are derived. The advantages and disadvantages of this method are shown. Further, to compare the results of the study, the kinematics of the mechanism is performed by the graphic-analytical method. The method developed by the authors was used in the graphic-analytical study.

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26

Wu, Linping, Shangjun Ma, Qi Wan, and Geng Liu. "Dynamic Model of Planetary Roller Screw Mechanism with Considering Torsional Degree of Freedom." MATEC Web of Conferences 306 (2020): 01003. http://dx.doi.org/10.1051/matecconf/202030601003.

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To predict accurately the dynamics performance of planetary roller screw mechanism, it is necessary to establish its streamline and engineering-compliant dynamic model, which is the basis of mechanical design and precision control of the system. In this paper, the relative displacement between roller and ring gear along the line of action is deduced and the relationship between nature frequencies and the number of rollers is discussed. Considering the torsional stiffness of all components and the thread mesh stiffness based on the Hertzian contact theory, the purely torsional model for planetary roller screw mechanism is presented to reveal the natural frequencies and vibration mode characteristics of the system. The results show that the natural properties of undamped system in planetary roller screw mechanism are mainly reflected by two typical vibration modes: rotational mode and roller mode.

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27

Hernandez, S., S. Bai, and J. Angeles. "The Design of a Chain of Spherical Stephenson Mechanisms for a Gearless Robotic Pitch-Roll Wrist." Journal of Mechanical Design 128, no. 2 (June 6, 2005): 422–29. http://dx.doi.org/10.1115/1.2167653.

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Although bevel-gear robotic wrists are widely used in industrial manipulators due to their simple kinematics and low manufacturing cost, their gear trains function under rolling and sliding, the latter bringing about noise and vibration. Sliding is inherent to the straight teeth of the bevel gears of these trains. Moreover, unavoidable backlash introduces unmodeled dynamics, which mars robot performance. To alleviate these drawbacks, a gearless pitch-roll wrist is currently under development for low backlash and high stiffness. The wrist consists of spherical cam-rollers and spherical Stephenson linkages, besides two roller-carrying disks that drive a combination of cams and Stephenson mechanisms, the whole system rotating as a differential mechanism. The paper focuses on the design of the chain of spherical Stephenson mechanisms. The problem of the dimensional synthesis is addressed, and interference avoidance is discussed. An embodiment of the concept is also included.

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28

Luo, You Xin, Heng Shu Li, Hui Jun Wen, and Yu Zhou. "The Research of Drill Propulsion Mechanism with Eccentric Wheel Handspike Roller Movable Inner Gear Profile Curve Shaped-Connection." Applied Mechanics and Materials 152-154 (January 2012): 1397–400. http://dx.doi.org/10.4028/www.scientific.net/amm.152-154.1397.

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This paper deals with the existing propulsion mechanism, analyzes the disadvantages of the flat key and the spline, studies the features of the eccentric wheel handspike roller movable inner gear profile curve shaped-connection. In an existing chain propulsion mechanism, we change the fit of the inner hole of sprocket gear and the outer circle of intermediate shaft to get a eccentric wheel handspike roller movable inner gear profile curve shaped-connection (a keyless joint), then introduce the propulsion mechanism with eccentric wheel handspike roller movable inner gear profile curve shaped-connection. At last, we create the three-dimensional modeling of the propulsion mechanism, which would lay a solid foundation for the further study. This new propulsion mechanism has such advantages as self-centralizing, easy disassembly, low stress concentration, with a simple fit cross-section, transmitting big torque, suitable for the heavy loads of rock drilling.

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29

Lustenkova, E. S. "PROCEDURE FOR CALCULATION AND DESIGN OF SPHERICAL ROLLER GEARS WITH DOUBLE-ROW PINION." Mechanics of Machines, Mechanisms and Materials 2, no. 55 (June 2021): 18–24. http://dx.doi.org/10.46864/1995-0470-2021-2-55-18-24.

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The article presents a method for calculating and designing spherical roller gears with a double-row pinion. The studied gears are analogs of planetary gears with a double-wheel pinion. They make it possible to implement a wide range of gear ratios. The advantages of spherical roller gears include small dimensions, low material consumption, and layout properties. A special feature of the proposed calculation algorithm is the search for optimal geometric gears parameters according to the criteria of maximum efficiency coefficient taking into account maximum load capacity for a given maximum radial dimensions. The main criterion of strength is fatigue endurance. The method includes design and verification calculations. It makes it possible to develop the small-sized speed reducers for low-speed drives for various purposes.

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30

Liu, Hu Ran. "The Precision Conjugate Theory for the Roller Hourgrass Worm Transmission." Advanced Materials Research 179-180 (January 2011): 967–72. http://dx.doi.org/10.4028/www.scientific.net/amr.179-180.967.

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The roller Hourgrass worm transmission has the properties of high efficiency in meshing, high power transmission, large load capability, long working live, and can save nonferrous metal. This paper made deep investigation into the precision conjugate theory for the roller Hourgrass worm transmission. And the forming theory and machining of the worm gear and its cutting tool,---the hob of worm gear, has been researched as well.

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31

Kim, Chang-Hyun, Hyoung-Chul Nam, and Soon-Man Kwon. "Linear Drive Systems using Roller Gear Mechanism." Journal of manufacturing engineering & technology 21, no. 5 (October 15, 2012): 702–7. http://dx.doi.org/10.7735/ksmte.2012.21.5.702.

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32

Lo, Jie-Shing, Ching-Haun Tseng, and Chung-Biau Tsay. "NON-UNDERCUTTING CONDITIONS OF ROLLER GEAR CAMS." Transactions of the Canadian Society for Mechanical Engineering 26, no. 4 (December 2003): 413–34. http://dx.doi.org/10.1139/tcsme-2002-0025.

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The undercutting conditions in a planar cam can be predicted by comparing the radius of the curvatures of the pitch curves with the radius of the cutter. For the complexity of the spatial cam generation, the principle radius of the curvatures and the directions of the generated cam surface are different from point to point along the pitch curve so that predicting the undercutting condition becomes very difficult. The undercutting conditions on the roller gear cams use the concept of limiting conjugate motion generation. In this study, the feasible design region without undercutting is presented. The investigation results are very useful to the designer and the manufacturing engineer for understanding the undercutting characteristics of the roller gear cam.

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33

Xue, Yun Na, Yong Wang, and Zheng Wang. "Meshing Theory of New Epicycloids Gear Drive." Advanced Materials Research 383-390 (November 2011): 5238–41. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.5238.

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In order to realize the pure rolling, improve the contact ratio, remove the backlash and raise the life, a new epicycloids gear drive is put forward. The drive part of the particular mechanism is a wheel with the roller tooth and is called the roller gear. And the driven part is the epicycloids gear. The tooth profile equation is achieved and meshing characteristics is also studied. The basic parameters of the new mechanism are researched and the 3D model is achieved. The research result shows that the new drive is workable and the new mechanism has a wide application prospect.

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Plekhanov, F. I., and A. V. Ovsyannikov. "Load distribution over the roller length in a gear-roller planetary transmission." Russian Engineering Research 31, no. 3 (March 2011): 203–5. http://dx.doi.org/10.3103/s1068798x11030233.

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Alamsah, Safingi, Yaser Krisnafi, Arif Baswantara, Berbudi Wibowo, and Regil Kentaurus Harryes. "The MEKANISASI BAGAN TANCAP MENGGUNAKAN ROLLER PENGANGKAT JARING DI PANGANDARAN, JAWA BARAT." Marine Fisheries : Journal of Marine Fisheries Technology and Management 12, no. 2 (March 11, 2022): 195–205. http://dx.doi.org/10.29244/jmf.v12i2.33567.

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Pangandaran is located in the southern coast of the Java Island. Some of Pangandaran fishers operate lift net (bagan) to catch fish and shrimp. During hauling process, the net is lifted manually using a roller that potentially harm the fishers. The purpose of this study was to design a mechanical roller that applicable for lift net. The analysis of design requirement, such as calculation of torque, horse power, and reduction power with gear mechanism for operating the roller were applied in this research. The results showed that the net lifting operation required 4.8 HP or 3.6 KW of diesel engine to power a hydraulic pump. For the maximum load, when the net is fully loaded with fish, the operation required 67.91 HP or 50.64 KW. It means power from the diesel motor was not enough to support at maximum load. Therefore, a gear mechanism with a ratio of 1:14 was applied. However, this method reduces the angular speed of the gear which leads to reduction on net pulling speed. Keywords: Lift net, hydraulic, horse power, power, and lifnet roller

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Yan, Hong-Sen, and Hsin-Hung Chen. "Geometry Design of Globoidal Cams With Generalized Meshing Turret-Rollers." Journal of Mechanical Design 118, no. 2 (June 1, 1996): 243–49. http://dx.doi.org/10.1115/1.2826876.

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This paper derives the generalized surface equation for cylindrical, conical, and hyperbolic meshing turret-rollers. Based on the generalized equation of meshing turret-rollers, generalized mathematical expressions of surface geometry for globoidal cams with cylindrical, conical, and hyperbolic meshing turret-rollers are derived using theory of conjugate surfaces, differential geometry, and coordinate transformation. A design example is presented for demonstrating procedures of surface generating of the globoidal cam. The result of this work is necessary for the computer-aided design and manufacturing of roller gear cams for industrial applications.

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Ren, Jia Zhi, Guo Xin Jia, and Li Bin Zhang. "Influences of Cylinder Speed-Change Mechanism Parameter for Processing Property on High-Speed Comber." Advanced Materials Research 308-310 (August 2011): 1981–87. http://dx.doi.org/10.4028/www.scientific.net/amr.308-310.1981.

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In order to resolve the contradiction of cylinder, nipper and detaching roller in movement coordinate on high speed comber, use elliptic gear transmission make cylinder turn changeably. Use MATLAB software calculates and simulates the angular displacement, angle velocity and angle acceleration of cylinder speed change movement. Then technological parameters such as the timing of combing with cylinder speed change, and the timing of the last row of needle on cylinder through detaching roller are analyzed. The results show: cylinder transmission mechanism by the style of elliptic gear can achieve short time of cylinder combing, increase time of preparing of detaching and lapping and time of lap raise end. Meanwhile the last row of needle on cylinder passes detaching roller earlier, cylinder catches away reversed combed web from detaching roller is effectively avoided.

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SÓJKA, Michał. "THE LUBRICITY AND LOW FRICTION ADDITIVES FOR TRANSMISSION OIL." Tribologia 277, no. 1 (March 1, 2018): 95–100. http://dx.doi.org/10.5604/01.3001.0012.0003.

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The subject of this paper is the extension of the durability of multi-stage gear units working in moments or constant overloads. Gear oils in sugar conveyor systems of the DC tray extractor were tested. Lubrication parameters and modifications of this parameter have been studied by adding additional materials to the oil. Additionally, the noise levels emitted by practical transmissions before and the addition of modifiers were measured. The lubrication tests were carried out on a semi-Timken apparatus, for example, friction roller friction – roller, in oils extracted from the gear unit. Sound level tests were performed using the SoundMeter application with a MIC001 microphone adapter. The results confirmed the effectiveness of the modified equipment, which was raised to a higher value, and also the noise level of the working gear was reduced. It has been shown that, in the current operating systems, a method of increasing the lubricant parameters of the gear oils is required, which translates into the durability of the gear pairs during operation.

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Yu, Ke Qiang. "The Designment of Double-Roll Cake Breaker." Advanced Materials Research 734-737 (August 2013): 2694–98. http://dx.doi.org/10.4028/www.scientific.net/amr.734-737.2694.

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This paper combined the actual situation of crushed soybean processing, for the The double-roll cake breaker and structural design of the shafts, gears, gear plate and flexible institutions were discussed and final using UG software animation simulation,Provides a theoretical foundation for the future research for efficient processing of soybean cake breaker. Key words: double-roller, cake breaker,design.

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Belousov, Yuri V. "Method for determining the optimal parameters of the chain transmission, taking into account the design of the drive chain." RUDN Journal of Engineering Researches 22, no. 1 (August 27, 2021): 72–83. http://dx.doi.org/10.22363/2312-8143-2021-22-1-72-83.

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Goal . Develop the design of the drive plate chain and methods for determining the optimal parameters of the chain transmission. Methods. Analysis of the designs of standard drive bushing and roller chains, as well as the drive plate chain with internal engagement. Determination of ways to increase the durability of these chains and chain gears from the condition of ensuring the wear resistance of their hinges and increasing their technical and economic indicators. Results . The analysis of designs of standard drive bushing-roller chains and drive plate chains with internal gearing is performed. A promising design of the drive plate chain has been developed. The optimization of transmission parameters, both with standard chains, and with the chain proposed by the authors, providing an increase in their durability and efficiency. In this regard, a method has been developed for determining the greatest elongation of standard chain links, as well as the chain developed by the authors, from the condition of wear resistance of their hinges. A method for determining the optimal transmission ratio of these chain gears has also been developed. It is established that the gear ratio of the transmission with the drive plate chain developed by the authors is determined primarily by the accuracy of manufacturing its hinges. With sufficiently precise manufacturing of chain hinge parts, the gear ratio can be significantly increased, up to u=10 and higher. This will allow you to use gears equipped with this chain in drives with a large gear ratio.

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Chang, De Gong, R. Zong, and Cong Feng An. "Dynamics Simulation Analysis of Roller Gear Indexing Cam Mechanism with Friction Gap." Advanced Materials Research 426 (January 2012): 213–17. http://dx.doi.org/10.4028/www.scientific.net/amr.426.213.

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Based on multi-body dynamics theory, this paper uses ADAMS to carry on the dynamic simulation for assembly model of roller gear indexing cam mechanism in the case of frictionless and consideration of friction gap, detailed analysis of the gap generated by friction has influence on contact transmission of cam mechanism, and obtained the movement rule curves of angular velocity and angular acceleration and some valuable conclusions. It provided theoretical basis and reference for the subsequent design and research of roller gear indexing cam mechanism.

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WARDA, Bogdan, and Henryk DUDA. "A METHOD FOR DETERMINING THE DISTRIBUTION OF LOADS IN ROLLING PAIRS IN CYCLOIDAL PLANETARY GEAR." Tribologia 271, no. 1 (February 28, 2018): 105–11. http://dx.doi.org/10.5604/01.3001.0010.6370.

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The power transmission system in the cycloidal planetary gear is created by a serial connection of three rolling pairs: central cylindrical roller bearings, a set of rolling pins in the straight-line mechanism, and cycloidal meshing. The paper presents the numerical method for determining the distribution of forces acting on each rolling pair of this gear. Unlike analytical methods, numerical methods allow one to find that distribution in corrected meshing. Geometrical dimensions used in the equations of balance for the planetary gear transmission Palmgren`s dependences for the deformation line contact were used to calculate forces between co-operating elements. Once the distribution of load is known, one can predict the fatigue life of Cyclo’s gears in rolling pairs. The fatigue of rolling pairs is a very good criterion to optimize geometrical parameters of the power transmission system.

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Zhou, Yi Qi, Wei Xiao Tang, H. Zhang, and B. C. Shi. "Web Based Virtual Design of Dynamics of Roller Gear Cam System." Materials Science Forum 471-472 (December 2004): 677–81. http://dx.doi.org/10.4028/www.scientific.net/msf.471-472.677.

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The remote virtual design system based on B/S framework is investigated in the paper. On reviewing the current virtual design system situation, the control system dynamics simulation is integrated into the virtual design system of roller gear cam mechanism. Simulink and Matlabserver are employed to realize the dynamics simulation for the system, and COM and VRML technologies are used to browse the virtual model on the network platform. The prototype system indicates that the system can serve as an effective tool for designing roller gear cam mechanism with the better properties of interactive dynamics performance design and expansion usage.

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Wang, Kai, Jin Yao, Jueling Wang, Jinge Wang, and Xingqiao Deng. "Theoretical Research on Load Capacity of Double-Roller Enveloping End Face Engagement Worm Gear." Open Mechanical Engineering Journal 8, no. 1 (December 31, 2014): 967–73. http://dx.doi.org/10.2174/1874155x01408010967.

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The calculation of load capacity is the key problem of worm's analysis. Taking the double-roller enveloping end face engagement worm gear as an example, a method for the numerical analysis of capacity was proposed based on finite element theory and fatigue analysis. Based on the meshing theory, the meshing equation was derived, and the accurate mathematical model for tooth surface of worm gear was established. Then the finite element modeling of worm gear was to analyze the contact stress and stress-strain effect. Finally, applying the safe life calculation method, the factors of fatigue life of worm gear were analyzed and researched. The researched result indicate that the worm gear has a quite good mesh performance when the worm meshing teeth have eight pairs. Under the same condition, with the analysis of the model's strength and finite elements performed, it was confirmed that the load capacity of end face engagement worm gear has an obvious improvement by comparison of that of enveloping hourglass worm gear, further, the maximum tooth root stress was only 6.5% of enveloping hourglass worm'. Meanwhile, the load distribution is in a declining invert L shape. And the fatigue life of end face engagement of worm gear pair could be attained 10 cycles. Therefore, this study results provided the theoretical basis and industrial applications value for transient analysis of end face engagement of worm gear and manufacturing constantly in the future.

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45

Yang, Xi, Mengxuan Yan, Yuyao Zhou, and Rui Liu. "The Dynamic analysis of Planetary roller screw in Tree-climbing robot." Journal of Physics: Conference Series 2029, no. 1 (September 1, 2021): 012060. http://dx.doi.org/10.1088/1742-6596/2029/1/012060.

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Abstract In the tree-climbing robot, the sawing module is lifted and lowered by the planetary roller lead screw, so the dynamic analysis of the planetary roller lead screw is very important. In this paper, the stiffness of the mechanical joint of planetary roller lead screw is calculated according to the fractal theory, and the stiffness calculation formulas between roller and ring gear, roller and lead screw are obtained. In the dynamic simulation, the stiffness of each contact pair is set according to the formula, and two groups of models with consistent and inconsistent roller contact stiffness are established. The first six order modal analysis results of the two groups of models are compared, and the influence of uneven roller contact stiffness distribution on the whole planetary roller lead screw is obtained.

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46

Ge, Rong Yu, Qing Song Wang, and Xu Qiang Shang. "Self-Adaptive Compensation Method on the Tool Position of Roller Gear Cam Surface." Advanced Materials Research 154-155 (October 2010): 396–400. http://dx.doi.org/10.4028/www.scientific.net/amr.154-155.396.

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The roller gear cam surface is often machined by the unequal diameter manufacture method, which means the tool diameter is smaller than that of the roller and the tool position compensation method is most used. For tool position of roller gear cam, it is important to confirm the compensation vector for the tool position compensation method, including compensation value and direction. In the paper, a new self-adaptive tool position optimization method is proposed, which make minimizing the normal machining error as the object function and make two compensation factors as the optimization variables. This algorithm can find out the best compensation direction and value by the tool position optimization for any cam rotation angle and make the tool position self-adaptive and flexible compensation according to the machining error. A numerical calculation example shows that the optimization algorithm can feasibly reduce the machining error. At last a conclusion has been drawn that the radius difference between the tool and the roller is the best compensation value and the best compensation direction is not fixed.

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Chou, C. C., and J. F. Lin. "Tribological effects of roughness and running-in on oil-lubricated line contacts." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 211, no. 3 (March 1, 1997): 209–22. http://dx.doi.org/10.1243/1350650971542435.

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A gear/cam adapter was employed to study various aspects of line-contact lubrication, using oil with extreme-pressure additive at two different concentrations. The effect of run-in on the tribological performance of rollers with two different surface roughnesses was investigated in terms of friction coefficient, wear loss, oil temperature, specimen roughness and electrical resistance. The relation between roller wear loss and the time rate of electrical resistance change was established. Electrical resistance versus oil temperature underwent a dramatic change during testing, a period of rising oil temperature and relatively constant low electrical resistance abruptly becoming a period of relatively constant oil temperature and rising electrical resistance, low wear rates correlating strongly with the second period. The run-in effect on roller wear loss in smooth rollers ( Ra = 0.076 μm) is opposite to that in rough rollers ( Ra = 0.463 μm). The asperity height of the smooth rollers was increased by wear testing irrespective of run-in; however, run-in enhanced the increase in surface roughness. The extreme-pressure additive concentration instead of run-in was the decisive factor in electrical resistance. Friction coefficients during testing showed a strong positive relation with composite surface roughness.

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Kurushin, Mikhail, and Venceslas Ossiala. "Method of calculation dynamics roller bearings pinion differential gear." Journal of Dynamics and Vibroacoustics 5, no. 2 (June 21, 2019): 26. http://dx.doi.org/10.18287/2409-4579-2019-5-2-26-36.

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Grujicic, M., V. Chenna, R. Galgalikar, J. S. Snipes, S. Ramaswami, and R. Yavari. "Computational analysis of gear-box roller-bearing white-etch cracking." International Journal of Structural Integrity 5, no. 4 (November 11, 2014): 290–327. http://dx.doi.org/10.1108/ijsi-10-2013-0028.

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Purpose – A simple economic analysis has revealed that in order for wind energy to be a viable alternative, wind-turbines (convertors of wind energy into electrical energy) must be able to operate for at least 20 years, with only regular maintenance. However, wind-turbines built nowadays do not generally possess this level of reliability and durability. Specifically, due to the malfunction and failure of drive-trains/gear-boxes, many wind-turbines require major repairs after only three to five years in service. The paper aims to discuss these issues. Design/methodology/approach – The subject of the present work is the so-called white etch cracking, one of the key processes responsible for the premature failure of gear-box roller-bearings. To address this problem, a multi-physics computational methodology is developed and used to analyze the problem of wind-turbine gear-box roller-bearing premature-failure. The main components of the proposed methodology include the analyses of: first, hydrogen dissolution and the accompanying grain-boundary embrittlement phenomena; second, hydrogen diffusion from the crack-wake into the adjacent unfractured material; third, the inter-granular fracture processes; and fourth, the kinematic and structural response of the bearing under service-loading conditions. Findings – The results obtained clearly revealed the operation of the white-etch cracking phenomenon in wind-turbine gear-box roller-bearings and its dependence on the attendant loading and environmental conditions. Originality/value – The present work attempts to make a contribution to the resolution of an important problem related to premature-failure and inferior reliability of wind-turbine gearboxes.

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Cheng, Xiu Quan, Ling Yan Sun, and Qin Xiang Xia. "Processing Parameters Optimization for Stagger Spinning of Trapezoidal Inner Gear." Advanced Materials Research 189-193 (February 2011): 2754–58. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.2754.

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Spin-forming of trapezoidal inner gear is a new technology of the near-net forming in gear manufacturing field. Processing parameters, such as the initial thickness of blank and radial reductions of each roller, greatly influence the forming quality of spun part. The forming quality of trapezoidal inner gear involves the filling status of gear tooth and dimensional accuracy of root circle. An approach for processing parameter optimization of the forming quality of the trapezoidal inner gear stagger spinning is proposed. The proposed approach integrates the orthogonal experiment design, gray relational analysis, and analysis of variance (ANOVA). The experiment result indicates that the proposed approach is effective in determining the optimized processing parameters for the stagger spinning of trapezoidal inner gear.

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