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Автор: Grafiati
Опубліковано: 30 травня 2022
Оновлено: 31 травня 2022

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Статті в журналах з теми "Design, roller gear"

1

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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2

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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3

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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4

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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Анотація:
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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5

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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6

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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Анотація:
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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7

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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8

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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9

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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10

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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Анотація:
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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Більше джерел

Дисертації з теми "Design, roller gear"

1

Chen, Hsin-Hung, and 陳信宏. "Geometric surfaces design of roller-gear cams." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/79345680381644797903.

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2

LIN, BO-ZHENG, and 林博正. "Geometric design and kinematic analysis of roller gear cams." Thesis, 1992. http://ndltd.ncl.edu.tw/handle/82163528940092531637.

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Анотація:
碩士
國立中山大學
機械工程研究所
80
1.1 間歇運動及其機構之比較 1.2 滾子輪式凸輪之優缺點及特徵 1.3 背景說明 1.4 論文目的與內容說明 第二章 滾子輪式凸輪輪廓的決定 2.1 簡介 2.2 利用剛體旋轉法求平面凸輪之輪廓 2.3 利用剛體旋轉法求滾子輪式凸輪之輪廓 2.4 利用接觸法求滾子輪式凸輪之輪廓 第三章 滾子輪式凸輪運動分析 3.1 凸輪及滾子輪承受的負荷種類 3.2 壓力角與作用於凸輪與滾子輪上的各分力大小 3.3 曲率與接觸應力 3.4 凸輪與滾筒之間的摩擦力 3.5 實際作動負荷的大小及方向 3.6 凸輪與滾子輪之間的機械效率 3.7 馬力數之計算 第四章 滾子輪式凸輸的設計及範例 4.1 簡介 4.2 產業機械作間歇傳動用之滾子輪式凸輪 4.2.1 設計規範與設計參數 4.2.2 運動曲線對設計凸輪的影響分析比較 4.2.3 暫停分度角對設計凸輪的影響分析比較 4.3 工具機自動換刀裝置用之滾子輪式凸輪 4.3.1 設計規範與設計參數 4.3.2 現況分析與改善對策 4.3.3 改善後比較 第五章 結論 參考文獻
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3

Tsai, Payee, and 蔡培毅. "Design of Rotary Tables Using Roller Gear Cam Mechanisms." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/33663526487147279466.

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Анотація:
碩士
國立中山大學
機械工程學系研究所
88
Rotary tables are generally regarded as the forth axis of machining tools. Traditionally, gear sets are used as reducers in the rotary tables. In order to improve the positioning accuracy, load and efficiency of rotary tables, a rotary table which applies the roller gear cam reducer is proposed. From the deduction of the theory, applications of roller gear cam reducers in the industries can be achieved. This thesis is focused on developing the procedure as follows: Firstly, the type of roller gear cam reducer and design parameters are identified. Secondly, the mechanical characteristics of the device are analyzed. Finally, a rotary table is designed and implemented to investigate the performance of the of the roller gear cam rotary table.
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4

Lin, Tsung-Yi, and 林聰益. "On the Design and Dynamic Testing of Roller Gear Cam Mechanisms." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/69973262507217584190.

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Анотація:
碩士
國立成功大學
機械工程學系
85
Roller-gear-cam mechanisms are one of the inteimittent motion mechanisms widely used in industries for their excellent performance in loading capacity, operating noise, rumimg vibration, and system reliability. This research consists of the following two parts: the discussion of the theories and methods for the design of roller-gear-cam mechanisms to construct analytical models, and the analysis and dynamic testing of the prototypes. Design parameter are decided first according to design requirements. Based on coordinate transformation and theory of conjugate surfaces, the systematic mathematical surface equations of the roller-gear-camwith different type of rollers are derived. The analytical models of kinematicdesign, dynamic design, and strength design are developed with design parameters. By controlling the values of design parameters, the performances of roller-gear-cams are obtained. By way of the surface normal vector of the cam and the velocities of the cam and the roller, the manipulability index and transmissivity index of this mechanism to evaluate the transmitting performance we derived, The lubrication angle is defined as the index of lubricant condition of the conjugate surfaces. Loading analysis of Joints and contact force, moment, friction force, friction moment, and required input torque between pairs, based on coulomb friction model, are carried. The stress distribution of different points of the roller-gear-cam by Hertz contact stress is obtained in dynamic design. And, the finite element method is applied on the points having maximum Hertz contact stress with PATRAN software. A testing machine is constructed for the experimental testing of a prototype roller-gear-cam. The experimental datum is in agreement with analytical results. The output of this work is of necessary for the design and analysis of roller-gear-cam mechanisms.
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5

Chen, Chong-Guang, and 陳重光. "On the Range of Avoiding Undercutting of Design Parameters of Roller-Gear Cam Mechanisms with Three Types of Meshing Elements." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/05695789019124344221.

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Анотація:
碩士
國立成功大學
機械工程學系
89
Roller-gear cam mechanisms are used in various machines, and they are spatial cam mechanisms. The mechanisms can give dwell and/or index motions. Thus they can also be used as intermittent motion mechanisms. The curvature is one of the most important characteristics of the spatial cam. It can be used to determine if there is interference or undercutting, also it has close relationship to the stress and lubrication of the mechanism. The design and manufacture of roller-gear cams are quite difficult. The relevant reports are rarely found, especially those about their undercutting problems. Based on theory of conjugate surfaces, a methodology to determine the ranges of design parameters for avoiding undercutting, of roller-gear cam mechanisms with three types of meshing elements, is proposed in this study. Accordingly, the analytical-form solution of the range of parameter r, the radius of the cylindrical meshing element, for avoiding undercutting is derived; however, those of other parameters need to be determined by using a numerical method. Furthermore, those of all the parameters of the mechanisms with conical or hyperbolic meshing elements need also be decided with a numerical method. Examples are included to explain the usage of the proposed methodology and to verify its correctness. The methodology proposed in this study, can be used to determine the range of a design parameter to avoid undercutting of roller-gear-cam mechanisms, when other parameters are specified. It is a useful tool for designing the mechanisms. Thus, it is believed that the results of this study are valuable in both of the academic field and industrial applications.
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6

Chang, Geeng-Kwei, and 張耿魁. "DESIGN OF SERVO CONTROL SYSTEM BY INTEGRAL VARIABLE STRUCTURE MODEL FOLLOWING CONTROL WITH APPLICATION TO ROLLER GEAR CAM AND POWER SYSTEM." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/24233944536502430421.

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7

Chen, Chong-Guang, and 陳重光. "On the Surface Design, Curvature Analysis, and the Ranges of Design Parameters for Avoiding Rib Surface Intersection and Undercutting of the Novel Roller-Gear Cam Mechanisms with a Turret in both Rotation and Translation." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/49218599668100217728.

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Анотація:
博士
國立成功大學
機械工程學系碩博士班
97
Dwell and indexing motions are quite easy be given by using roller-gear cam mechanisms (RGCMs), so they are often used as intermittent motion mechanisms. Besides, they also have many good characteristics, so as to be used in various automatic machines, such as the automatic tool changers in machining centers. For RGCMs, the barrel cam transmits motion and power to the turret via the conjugate contact between the rib surfaces and rollers. Thus to design the rib surfaces well is very important to get good characteristics. Whereas if the geometric parameters are selected inappropriately, two side-surfaces of a rib could contact to or even intersect each other, such that the rib has not enough strength or even lose its transmitting function. Yet, relevant studies on rib-surface intersection have not been found in existing literatures. A model, for the judgment of whether two side-surfaces of a rib contact or not, is proposed. Consequently, mathematical models for the determination of the ranges of several geometric parameters to avoid rib-surface-intersection are developed. An example is given to demonstrate the usages of the proposed models and to exam their correctness. Feasible regions of geometric parameters, to avoid rib-surface-intersection and undercutting, are also given. For some existing automatic tool changers in machining centers, the RGCM has to be integrated with a five-bar linkage driven by the groove cam, which is cut on one side of the barrel cam, to provides translational motions of disengaging and inserting tools. A RGCM, whose turret can rotate and translate simultaneously, is proposed, such that the structure of such machines can be simplified. Except the models of surface design and curvature analysis been developed, those for determining the ranges of several geometric parameters to avoid rib-surface-intersection and undercutting, respectively, are also developed. Among them, a close-form solution, to determine the range of the roller radius for avoiding undercutting, is derived, if the rollers are cylindrical ones. Two examples are included to show the characteristics of the mechanism and to exam the correctness of the proposed models. In one of which, the translating direction of the turret is the same as its rotational axis; however, they are different in the other example. Feasible regions of geometric parameters, to avoid rib-surface-intersection and undercutting, are also given. In summary, except an innovative roller-gear cam mechanism is proposed, the proposed models for the determination of the ranges of the geometric parameters to avoid rib-surface-intersection and undercutting of RGCMs should be helpful in the design of these mechanisms. It is believed that these results are valuable in both of the academic field and industrial applications.
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8

Синюк, О. М., та O. M. Synyuk. "Наукові основи проектування обладнання для переробки полімерних відходів у вироби легкої промисловості". Дисертація, 2018. http://elar.khnu.km.ua/jspui/handle/123456789/7647.

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Книги з теми "Design, roller gear"

1

J, Anderson William. Roller-gear drives for robotic manipulators, design, fabrication and test: Final report for NASA Lewis Research Center, contract NAS 3-25803. [Washington, DC: National Aeronautics and Space Administration, 1991.

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2

J, Anderson William. Traction drives for zero stick-slip robots, and reaction free, momentum balanced systems: Final report for NASA Lewis Research Center, contract NAS 3-26897. [Washington, DC: National Aeronautics and Space Administration, 1995.

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3

United States. National Aeronautics and Space Administration., ed. Planetary-gear-support bearing test rig design. King of Prussia, Penn: SKF Industries, 1985.

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4

United States. National Aeronautics and Space Administration., ed. Planetary-gear-support bearing test rig design. King of Prussia, Penn: SKF Industries, 1985.

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5

J, Anderson William, and United States. National Aeronautics and Space Administration., eds. Roller-gear drives for robotic manipulators, design, fabrication and test: Final report for NASA Lewis Research Center, contract NAS 3-25803. [Washington, DC: National Aeronautics and Space Administration, 1991.

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6

J, Anderson William, and United States. National Aeronautics and Space Administration., eds. Roller-gear drives for robotic manipulators, design, fabrication and test: Final report for NASA Lewis Research Center, contract NAS 3-25803. [Washington, DC: National Aeronautics and Space Administration, 1991.

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7

Davis, J. R., ed. Gear Materials, Properties, and Manufacture. ASM International, 2005. http://dx.doi.org/10.31399/asm.tb.gmpm.9781627083454.

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Анотація:
Gear Materials, Properties, and Manufacture explains how material-related properties and operating conditions affect the lifetime and performance of gears and the ways in which they fail. It begins with a review of the basic design and configuration of gears and related engineering considerations. It then examines the effect of friction and wear and the role of lubrication in gear failures. It explains how to calculate lubricant film thickness, defines lubrication regimes, and presents guidelines for selecting and applying lubricants for specific applications. The chapters that follow cover gear materials and manufacturing methods, providing details on metals and plastics and processes such as casting and forging, powder metallurgy, injection molding, machining, grinding, finishing, and carburizing and nitriding treatments. The final chapters discuss the types and causes of gear failures and the steps involved in failure analysis. They also explain how to assess fatigue damage and estimate remaining service life and describe the tests that are used to evaluate the durability of gears under load. For information on the print version, ISBN 978-0-87170-815-1, follow this link.
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8

N-Force Presents: Tips Force. Shropshire, UK: Europress Impact Ltd., 1992.

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Частини книг з теми "Design, roller gear"

1

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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2

Zindani, Divya, and Kaushik Kumar. "Selection of Prototyping Process and Part Orientation for Virtually Manufactured Gears." In Handbook of Research on Ergonomics and Product Design, 364–80. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-5234-5.ch020.

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This chapter explores transformation of a virtually produced gear to a physical product using rapid prototyping technique. The same can be segregated into two parts. The first being selection of the best possible rapid prototyping technique using dynamic mechanical analysis and the next was optimization of the process parameters of the selected rapid prototyping technique considering tensile strength as the criteria. The results indicated that fused deposition modeling process provides the best solution amongst the techniques studied. Moreover, as orientation of the product in rapid prototyping techniques plays an important role in providing the strength and also accuracy of the product profile, from results it was also ascertained that strength and profile accuracy of the product was optimized with horizontal position.
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3

Pool, Robert. "Complexity." In Beyond Engineering. Oxford University Press, 1997. http://dx.doi.org/10.1093/oso/9780195107722.003.0009.

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Things used to be so simple. In the old days, a thousand generations ago or so, human technology wasn’t much more complicated than the twigs stripped of leaves that some chimpanzees use to fish in anthills. A large bone for a club, a pointed stick for digging, a sharp rock to scrape animal skins—such were mankind’s only tools for most of its history. Even after the appearance of more sophisticated, multipiece devices—the bow and arrow, the potter’s wheel, the ox-drawn cart—nothing was difficult to understand or decipher. The logic of a tool was clear upon inspection, or perhaps after a little experimentation. No longer. No single person can comprehend the entire workings of, say, a Boeing 747. Not its pilot, not its maintenance chief, not any of the thousands of engineers who worked upon its design. The aircraft contains six million individual parts assembled into hundreds of components and systems, each with a role to play in getting the 165-ton behemoth from Singapore to San Francisco or Sidney to Saskatoon. There are structural components such as the wings and the six sections that are joined together to form the fuselage. There are the four 21,000-horsepower Pratt & Whitney engines. The landing gear. The radar and navigation systems. The instrumentation and controls. The maintenance computers. The fire-fighting system. The emergency oxygen in case the cabin loses pressure. Understanding how and why just one subassembly works demands years of study, and even so, the comprehension never seems as palpable, as tangible, as real as the feel for flight one gets by building a few hundred paper airplanes and launching them across the schoolyard. Such complexity makes modern technology fundamentally different from anything that has gone before. Large, complex systems such as commercial airliners and nuclear power plants require large, complex organizations for their design, construction, and operation. This opens up the technology to a variety of social and organizational influences, such as the business factors described in chapter 3. More importantly, complex systems are not completely predictable.
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Тези доповідей конференцій з теми "Design, roller gear"

1

Chen, Hsin-Hung, and Hong-Sen Yan. "On the Contact Sequences of Roller Gear Cam Mechanisms." In ASME 1998 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/detc98/mech-5823.

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Abstract This paper, we discuss various contact situations of roller gear cam mechanisms. Rules for determining the contact sequences of groove-traveling and rib-riding roller gear cam mechanisms are concluded. Differences of the contact sequences between roller gear cam mechanisms with and without preload are pointed out based on Newton’s law. An industrial application is presented as an example to illustrate how to use these rules for determining contact sequences of groove-traveling roller gear cam mechanisms. The result facilitates calculating processes both in the CAD/CAM of roller gear cam mechanisms.
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2

Nagamura, Kazuteru, Kiyotaka Ikejo, Eiichirou Tanaka, Takamasa Hirai, Toshiyuki Koumori, and Ichiro Kamimura. "Driving Performance of High Reduction Planetary Gear Drive With Meshing of Arc Tooth Profile Gear and Pin Roller." In ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/detc2007-34245.

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This paper describes a new type planetary gear drive with the high reduction ratio. The planetary gear drive is mechanically similar to a 2S-C type planetary gear, which has two sun gears and one carrier. The planetary gear drive has two pairs of an arc tooth profile gear and a pin roller, which mesh each other. The planetary gear drive has little backlash, a high efficiency, a long fatigue limit, etc., because the tooth contact holds on concave and convex surfaces. In this study, we measured the vibration acceleration, the transmission error, the gear noise, and the efficiency on the new type planetary gear drive by the running test. We discuss and report the driving performance of the planetary gear drive.
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3

Kilani, Mohammad I., Paul C. Galambos, Yousef S. Haik, and Ching-Jen Chen. "Electrostatically Actuated Surface Micromachined Offset Planetary Gear Pump Design." In ASME 2001 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/imece2001/mems-23874.

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Abstract An offset planetary pump fabricated in five-level polysilicon surface micromachining is introduced. The pump consists of a ring gear enclosing two planetary gears and an offset sun gear, which generates pumping due to its eccentric rotation. The pump is driven by an electrostatically actuated comb-drive microengine and mechanical power is transmitted to the ring gear through a micro gear train. The paper presents a derivation of pump capacity and the detailed design of its mechanical elements, demonstrating the implementation of relatively advanced mechanical functions in multi-level surface micromachining, including axial roller bearing support, fluidic seal and planetary gear transmission.
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4

Yan, Hong-Sen, and Hsin-Hung Chen. "Geometry Design of Roller Gear Cams With Generalized Meshing Elements." In ASME 1994 Design Technical Conferences collocated with the ASME 1994 International Computers in Engineering Conference and Exhibition and the ASME 1994 8th Annual Database Symposium. American Society of Mechanical Engineers, 1994. http://dx.doi.org/10.1115/detc1994-0096.

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Abstract This paper derives the generalized expression of surface equation for cylindrical, conical, and hyperbolic meshing elements. Based on the generalized equation of meshing elements, generalized mathematical expressions of surface geometry for roller gear cams with cylindrical, conical, and hyperbolic meshing elements are derived by theory of conjugate surfaces, differential geometry, and coordinate transformation. Design examples are given. The result of this work is of necessary for the computer-aided design and manufacturing roller gear cams for industrial applications.
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5

Deng, Xingqiao, Jie Wang, Shike Wang, Shisong Wang, Yucheng Liu, and Ge He. "Meshing Characteristics and Engagement of Anti-Backlash Single- and Double-Roller Enveloping Hourglass Worm Gear." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-11332.

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Abstract Anti-backlash roller enveloping hourglass worm gears, as a new precision transmission system, has been extensively applied in robot joint design, packaging production line, and CNC (computer numerical control) machine tools. However, their corresponding transmission principles are seldom reported in the literature. Based on the theories of differential geometry and gear meshing, this paper carefully analyzes and compares meshing characteristics of anti-backlash single- and double-roller enveloping hourglass worm gears in terms of their transmission principle, engagement equation, induced normal curvature, lubrication angle, autorotation angle, entrainment velocity, helix angle, and distribution of contact curves. Major differences between these two roller enveloping hourglass worms are theoretically demonstrated through this study. Our results show that the anti-backlash single-roller enveloping hourglass worm (ASEHW) gears provide better performance with respect to gear meshing and transmission than the anti-backlash double-roller enveloping hour glass worm (ADEHW) gears. Also, compared with the ADEHW gears, the ASEHW gears are easier to fabricate, install, and calibrate. However, the ADEHW gears are more auto-adjustable in eliminating gear backlash. The outcomes of this study will form a theoretical background for futuristic design, application, and promotion of the anti-backlash roller enveloping hourglass worm gears.
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6

Koide, Takao, Koji Tsubokura, Satoshi Oda, and Chiaki Namba. "Load Bearing Capacity of Super-Carburized Gears." 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-48016.

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This paper describes a study on the load bearing capacity of super-carburized gears. Test gears and rollers of MAC14 and SCM415 steels were super or eutectoid-carburized under different carburizing conditions. The impact and bending fatigue tests for test gears and the contact fatigue test for test rollers were carried out. The effects of case depths on the impact and bending fatigue strengths of gears and the surface durability of rollers were determined. The impact breaking limit energy of super-carburized gears was found to be larger by about 15% than that of eutectoid-carburized gears irrespective of case depth. The bending fatigue strength of the super-carburized gear was found to be almost equal to that of the eutectoid-carburized gear. The surface durability of the super-carburized roller becomes larger with an increase of case depth and is larger than that of eutectoid-carburized rollers in the case of larger case depth. The surface failure modes for super and eutectoid-carburized rollers were spalling. The load bearing capacity of super and eutectoid-carburized gears was found to become larger by shot-peening.
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7

Herna´ndez, S., S. P. Bai, and J. Angeles. "The Design of a Chain of Spherical Stephenson Mechanisms for a Gearless Pitch-Roll Wrist." In ASME 2004 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/detc2004-57424.

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Although bevel-gear 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, un-avoidable backlash introduces unmodeled dynamics, which mars robot performance. To alleviate these drawbacks, a gearless pitch-roll wrist is currently under design for low backlash and high stiffness. The wrist consists of spherical cam-rollers and spherical Stephenson linkages; two roller-carrying disks drive a combination of cams and Stephenson mechanisms rotating as a differential mechanism. In this paper, the design of the chain of spherical Stephenson mechanisms (SSMs) is introduced. 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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8

Yuansheng Qi, Xiaohua Wang, and Ju Sun. "The optimization design for printing roller gear based on parametric modeling and finite element analysis." In 2009 IEEE 10th International Conference on Computer-Aided Industrial Design & Conceptual Design. IEEE, 2009. http://dx.doi.org/10.1109/caidcd.2009.5375060.

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9

Deng, Xingqiao, Yucheng Liu, and Ge He. "Design and Assessment of an Antibacklash Single Roller Enveloping Hourglass Worm Gear." In WCX SAE World Congress Experience. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2019. http://dx.doi.org/10.4271/2019-01-1071.

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10

Lahmar, F., and P. Velex. "Simulations of Gear-Rolling Element Bearing Interactions in Geared Transmissions." 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-48040.

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Анотація:
The modular model of geared systems presented in this paper makes it possible to simultaneously account for the contact conditions in gears and rolling element bearings. Gears are modeled as two rigid cylinders connected by distributed mesh stiffnesses while ball and roller bearings contribute to the equations of motion as time-varying, non-linear external forces. Solutions are obtained by combining a Newmark time-step integration scheme, a Newton-Raphson method for ball bearing non-linearity and a normal contact algorithm that deals with the contact problem between the teeth. It is found that the static gear-bearing couplings are generally more important than the dynamic couplings with a significant influence of the gear on the bearing response. Finally, it is shown that, in certain conditions, bearings can generate non-linear parametric excitations of the same orders of magnitude as those associated with the meshing of helical gears.
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