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Journal articles on the topic 'Gear and Bearing Design'

Author: Grafiati

Published: 4 June 2025

Last updated: 1 August 2025

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1

Savage, M., S. B. Lattime, J. A. Kimmel, and H. H. Coe. "Optimal Design of Compact Spur Gear Reductions." Journal of Mechanical Design 116, no. 3 (1994): 690–96. http://dx.doi.org/10.1115/1.2919437.

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The optimal design of compact spur gear reductions includes the selection of bearing and shaft proportions in addition to the gear mesh parameters. Designs for single mesh spur gear reductions are based on optimization of system life, system volume, and system weight including gears, support shafts, and the four bearings. The overall optimization allows component properties to interact, yielding the best composite design. A modified feasible directions search algorithm directs the optimization through a continuous design space. Interpolated polynomials expand the discrete bearing properties an

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2

Surnis, Prathmesh. "Design and Analysis of 2-Stage Gearbox for ATV Applications." International Journal for Research in Applied Science and Engineering Technology 9, no. 9 (2021): 2193–210. http://dx.doi.org/10.22214/ijraset.2021.38326.

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Abstract: The main objective of this project is to design and develop a 2-Stage- Reduction gearbox for all terrain vehicles application. Gearbox is a mechanical unit consisting of series of gears within a housing (casing) or a simple gear train. It is the main component of the powertrain system as it provides speed and torque conversions from the Engine or CVT to the wheels. The gears inside of gearbox can be any one of a number of different types of the gear that are available in the market i.e., from spur gears to worm gears and planetary gears as well. In this report the gearbox is made fro

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3

Singh, Avinash. "Influence of Planetary Needle Bearings on the Performance of Single and Double Pinion Planetary Systems." Journal of Mechanical Design 129, no. 1 (2006): 85–94. http://dx.doi.org/10.1115/1.2359472.

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Planetary gears are widely used in automotive and aerospace applications. Due to demands for greater power density, these gearsets often operate at extremely high stress levels. This has caused system level influences once considered secondary to become critical to the success of planetary gears. One such system level effect that has been largely overlooked is the influence of support structures like planetary needle bearings. There are interactions between the gear distributed loads and the resulting bearing loads and deflections that have implications for both gear and bearing designs. Also,

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Hagemann, Thomas, Huanhuan Ding, Esther Radtke, and Hubert Schwarze. "Operating Behavior of Sliding Planet Gear Bearings for Wind Turbine Gearbox Applications—Part II: Impact of Structure Deformation." Lubricants 9, no. 10 (2021): 98. http://dx.doi.org/10.3390/lubricants9100098.

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The use of planetary gear stages intends to increase power density in drive trains of rotating machinery. Due to lightweight requirements on this type of machine elements, structures are comparably flexible while mechanical loads are high. This study investigates the impact of structure deformation on sliding planet gear bearings applied in the planetary stages of wind turbine gearboxes with helical gears. It focuses on three main objectives: (i) development of a procedure for the time-efficient thermo-elasto-hydrodynamic (TEHD) analysis of sliding planet gear bearing; (ii) understanding of th

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DUDA, Henryk, and Bogdan WARDA. "EFFECT OF STRAIGHT-LINE MECHANISM DESIGN ON THE LOAD DISTRIBUTION IN A CYCLOIDAL GEAR." Tribologia 279, no. 3 (2018): 35–42. http://dx.doi.org/10.5604/01.3001.0012.7009.

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In the cycloidal gear, the torque is transmitted to the planet gears via an eccentric shaft with central bearings mounted on it. A straight-line mechanism is used to output the torque from the planet gears to the output shaft, a mechanism which consists of rotational sleeves mounted on the pins rigidly connected to the output shaft disc. These sleeves roll off in the holes of the planetary wheel. The forces generated in the straight-line mechanism affect the distribution of forces in the cycloid gearing and the amount of force loading the central bearing. The article presents the influence of

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Moldovan, Cristian, and Carmen Sticlaru. "Performance Analysis of Polymer Additive Manufactured Gear Bearings." Applied Sciences 13, no. 22 (2023): 12383. http://dx.doi.org/10.3390/app132212383.

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Bearings in general, and in this case rotational bearings, are important elements in many machines. The main objective of this study was to find out the load-bearing capacity of 3D-printed gear bearings under various rotational speeds, test the bearings to failure and estimate their lifetime. An interesting note on the gear bearing is its uncommon geometric configuration, because the rolling elements are gears, which allows for a rolling-sliding motion between the constituting elements, minimizing the sliding effect. The material used is PLA (poly lactic acid), a common thermoplastic polyester

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Zhou, Shihua, Zhaohui Ren, Guiqiu Song, and Bangchun Wen. "Dynamic Characteristics Analysis of the Coupled Lateral-Torsional Vibration with Spur Gear System." International Journal of Rotating Machinery 2015 (2015): 1–14. http://dx.doi.org/10.1155/2015/371408.

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A sixteen-degree-of-freedom (16-DOF) lumped parameter dynamic model taking into account the gravity, eccentricity, bearing clearance, transmission error, and coupled lateral-torsional vibration is established. Based on the dynamical equation, the dynamic behaviors of the spur gear rotor bearing system are investigated by using Runge-Kutta method. The research focuses on the effect of rotational speed, eccentricity, and bearing clearance and nonlinear response of the coupled multibody dynamics is presented by vibration waveform, spectrum, and 3D frequency spectrum. The results show that the rot

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8

Tsimba, Wayne, Gibson Chirinda, and Stephen Matope. "MACHINE LEARNING FOR DECISION-MAKING IN THE REMANUFACTURING OF WORN-OUT GEARS AND BEARINGS." South African Journal of Industrial Engineering 32, no. 2 (2021): 135–50. http://dx.doi.org/10.7166/32-3-2636.

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Mechanical industries use rotating mechanical equipment in their day to day operations. The equipment suffers from wear and tear, and is usually discarded as scrap. But is there a way to recover some of this equipment and reuse it? This paper uses machine learning to capture and analyse the wearing damage of bearings and gears to determine whether they can be redeemed. Finite element analysis is conducted on worn-out spur gears and pillow bearings in order to facilitate feature extraction in image processing algorithms. This converts the actual gears, bearings, and seals into CAD files. The de

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Zhou, Yang, Bowen Che, and Ci Yuan. "The design and analysis of a high-speed circular arc gear pump journal bearing." Advances in Mechanical Engineering 10, no. 12 (2018): 168781401881928. http://dx.doi.org/10.1177/1687814018819288.

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A series of problems arise when a gear pump operates at high speed, including instability of the rotor, deformation of the chamber, and wear of the journal bearing. Among all failure modes, journal bearing wear is the most serious. The wear of journal bearings of a circular arc gear pump that operates at high speed is thus presented in this article. A journal bearing that offsets the unbalanced radial force is designed by analysis of the fluid and determination of eccentricity of the gear shaft. Experiments show that the wear of the new journal bearing is effectively reduced.

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10

Shuai, Mo, Ma Shuai, Jin Guoguang, Gong Jiabei, Zhang Ting, and Zhu Shengping. "Design principle and modeling method of asymmetric involute internal helical gears." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 233, no. 1 (2018): 244–55. http://dx.doi.org/10.1177/0954406218756443.

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In the field of mechanical engineering, involute helical gears are widely used. Compared with the involute spur gear, helical gears have a high bearing strength, more smooth transmission, less impact and less noise. The internal gear pairs have the features of large transmission ratio, low vibration, low noise and low wear and hence are widely used in planetary gear transmission systems. In order to meet the requirements of high strength, high speed of the modern gear transmission systems, a new type of asymmetric involute internal helical gears is designed based on conventional involute gears

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Hagemann, Thomas, Huanhuan Ding, Esther Radtke, and Hubert Schwarze. "Operating Behavior of Sliding Planet Gear Bearings for Wind Turbine Gearbox Applications—Part I: Basic Relations." Lubricants 9, no. 10 (2021): 97. http://dx.doi.org/10.3390/lubricants9100097.

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The application of sliding planet gear bearings in wind turbine gearboxes has become more common in recent years. Assuming practically applied helix angles, the gear mesh of the planet stage causes high force and moment loads for these bearings involving high local loads at the bearing edges. Specific operating behavior and suitable design measures to cope with these challenging conditions are studied in detail based on a thermo-hydrodynamic (THD) bearing model. Radial clearance and axial crowning are identified as important design parameters to reduce maximum pressures occurring at the bearin

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Hua, Xia, and Zaigang Chen. "Effect of roller bearing elasticity on spiral bevel gear dynamics." Advances in Mechanical Engineering 12, no. 7 (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

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Litvin, F. L., A. Fuentes, A. Demenego, D. Vecchiato, and Q. Fan. "New developments in the design and generation of gear drives." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 215, no. 7 (2001): 747–57. http://dx.doi.org/10.1243/0954406011524117.

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Design, generation and simulation of the meshing and contact of gear drives with favourable bearing contact and reduced noise are considered. The proposed approach is based on replacement of the instantaneous line of contact of tooth surfaces by point contact and on application of a predesigned parabolic function of transmission errors that is able to absorb linear discontinuous functions of transmission errors caused by misalignment. Basic algorithms for analysis and synthesis of gear drives are presented. The developed theory is applied for design and generation of the following gear drives

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14

Wang, Xigui, Jian Zhang, Yongmei Wang, Chen Li, Jiafu Ruan, and Siyuan An. "Research on Meshing Gears CIMT Design and Anti-Thermoelastic Scuffing Load-Bearing Characteristics." Materials 15, no. 6 (2022): 2075. http://dx.doi.org/10.3390/ma15062075.

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In the process of gear meshing, it is an inevitable trend to encounter failure cases such as contact friction thermal behavior and interface thermoelastic scuffing wear. As one of the cores influencing factors, the gear meshing contact interface micro-texture (CIMT) significantly restricts the gear transmission system (GTS) dynamic characteristics. This subject suggests the contact characteristic model and interface friction dynamics coupling model of meshing gear pair with different CIMT. Considering the influence of gear meshing CIMT on distribution type of hydrodynamic lubricating oil film,

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15

Litvin, F. L., I. H. Seol, D. Kim, et al. "Kinematic and Geometric Models of Gear Drives." Journal of Mechanical Design 118, no. 4 (1996): 544–50. http://dx.doi.org/10.1115/1.2826926.

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A methodology is proposed for the modification of gear tooth surfaces that reduces the impact of gear drive misalignment, the shift of the bearing contact (accompanied in some cases with edge contact), and the occurrence of discontinuous functions of transmission errors. The proposed approach is tested by computerized simulation of meshing and contact for unloaded and loaded gear drives. Applications of geometry modifications to the design of spur and helical involute gears, double-circular helical gears, face-gear drives, face-milled spiral bevel gears with constant tooth height and worm-gear

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16

Zeng, Cheng Zhi, De Yao Tang, and Yi Gao. "Research on the Faults due to Bearing-Gear Mismatching in Gearbox of Wind Turbine Generator." Advanced Materials Research 889-890 (February 2014): 537–41. http://dx.doi.org/10.4028/www.scientific.net/amr.889-890.537.

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In order to lower down the fault rate of bearings and gears, tighten up the mechanical components safety and lengthen their lifetime, a new design method [ has occurred by matching bearings with gears. Whereas, this methodology is based on the simple transmission system, and it seems not applicable in more complicated transmission systems, such as gearboxes in doubly-fed wind turbine generators, which really need to be further studied, and thats where the topic of this article lies. By doing research on the bearing-gear matching design of planetary gear system in gearbox of wind turbine genera

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17

Mark, W. D. "Effects of Bearing Offset and Flexibility on the Mesh Force Distribution of Spiral Bevel Gears." Journal of Mechanisms, Transmissions, and Automation in Design 110, no. 2 (1988): 203–10. http://dx.doi.org/10.1115/1.3258927.

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For straight or spiral bevel gears of nominal spherical involute design, the resultant total force vector transmitted by the gear mesh, in the absence of friction, lies in the plane of tooth contact. This force vector can be characterized by three scalar components, two orthogonal force components lying in the plane of contact and the resultant moment taken about the nominal center of the zone of contact. Equations for these three generalized force components are derived. The equations are expressed in terms of tooth pair/gear body stiffnesses, bearing/bearing support flexibility influence coe

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18

Qi, Hong Yu, and Lei Liu. "Finite Element Analysis for Vibration Characteristic on Gear Rotors." Applied Mechanics and Materials 273 (January 2013): 193–97. http://dx.doi.org/10.4028/www.scientific.net/amm.273.193.

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Gear rotor systems are widely used in many automotive, aerospace and marine applications. Dynamic analysis of gear rotor systems is essential in describing noise and durability characteristics. Using ANSYS software, a finite-element model for a gear rotor system on flexible bearing has been developed, with MARTIX element, beam element and mass element simulating mesh-couple relation and support bearing, shaft and gear individually. The dynamic coupling among the axial, transverse, tensional and rotational motions of gears are considered in the model. The harmonic analysis and forced response o

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19

Litvin, F. L., Y. Zhang, J. C. Wang, R. B. Bossler, and Y. J. D. Chen. "Design and Geometry of Face-Gear Drives." Journal of Mechanical Design 114, no. 4 (1992): 642–47. http://dx.doi.org/10.1115/1.2917055.

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The authors have developed the analytical geometry of face-gear drives, proposed the method for localization of bearing contact, developed computerized simulation of meshing and bearing contact, investigated the influence of gear misalignment on the shift of bearing contact and transmission errors. Application for design is discussed. The obtained results are illustrated with numerical examples.

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20

Brassitos, Elias, and Nader Jalili. "Dynamics of integrated planetary geared bearings." Journal of Vibration and Control 26, no. 7-8 (2020): 565–80. http://dx.doi.org/10.1177/1077546319889848.

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The gear bearing drive is a new robotic transmission that was developed by NASA for compact and lightweight robotic applications. Compared to conventional simple and compounded planetary gear trains, the mechanical assembly of the gear bearing drive does not require a planetary carrier and individual planet needle bearings to maintain the gearset alignment. Instead, the design integrates the gearing and bearing functions together such that a constant pressure angle is maintained throughout the mesh cycle by the use of cylindrical rollers that are mounted parallel to the gear mesh. This paper e

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21

Litvin, F. L., D. Vecchiato, A. Demenego, E. Karedes, B. Hansen, and R. Handschuh. "Design of One Stage Planetary Gear Train With Improved Conditions of Load Distribution and Reduced Transmission Errors." Journal of Mechanical Design 124, no. 4 (2002): 745–52. http://dx.doi.org/10.1115/1.1515797.

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The authors propose an approach for the design of one-stage planetary gear train with reduced transmission errors, localized bearing contact and improved conditions of distribution of load between the planetary gears. The planetary gear train is considered as a multi-body mechanical system of rigid bodies. The proposed approach is based: (i) on modification of geometry of gear tooth surfaces, and (ii) minimization and equalization of the backlash between the contacting gear tooth surfaces. The modification of geometry is accomplished: (i) by double-crowning of planetary gears, and (ii) by appl

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22

Bagul, Om S. "Design, Load Analysis and Optimization of Epicyclic Gear Trains." International Journal of Advanced Research in Science and Technology 12, no. 11 (2023): 1197–204. http://dx.doi.org/10.62226/ijarst20231116.

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Abstract: Mechanical power transmission systems rely heavily on Epicyclic gear trains, as their failure can compromise the entire system. Consequently, identifying and mitigating the causes of gear failure is crucial. Various gear failure modes, including bending pitting (contact stresses), failure (load failure), abrasive wear, and scoring, are discussed in literature by J.R. Davis(2005) [24], Khurmi & Gupta (2006) [23], and P. Kannaiah (2006) [21][22]. These failures are often linked to the loads acting on the gears. This research focuses on optimizing gear design to reduce gear load fai

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Zhou, Zhi Gang, Da Tong Qin, Jun Yang, and Hui Tao Chen. "Study on Dynamic Characteristics of Wind Turbine Planetary Gear System Coupled with Bearing at Varying Wind Speed." Applied Mechanics and Materials 86 (August 2011): 653–57. http://dx.doi.org/10.4028/www.scientific.net/amm.86.653.

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The sparse least squares support vector machines (SL-SVM) is used to simulate wind speed of real wind field, and time-varying wind load caused by stochastic wind speed is then obtained. A coupling gear-bearing dynamical model of planetary gear transmission system of wind turbine is built using lumped-parameter method, in which the varying wind load, time-vary mesh stiffness of gear pair and time-vary stiffness of rolling element bearing are taken into account. Numerical method is used to simulate the dynamic performance of planetary gear transmission of multibrid technology wind turbine (MTWT)

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Kin, V. "Computerized Analysis of Gear Meshing Based on Coordinate Measurement Data." Journal of Mechanical Design 116, no. 3 (1994): 738–44. http://dx.doi.org/10.1115/1.2919444.

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A mathematical model is proposed for the reconstruction of gear tooth surface features based on the manufacturing process deviations measured with the help of a gear inspection (or coordinate measurement) machine. The model is extended to facilitate the computer simulation of meshing between the measured gear and a theoretical master gear, or between two measured gears. This would allow one to predict the transmission errors and bearing contact which are otherwise only possible to investigate using the combination of single-flank testing and a time-consuming work-in and examination procedure.

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Savage, M., K. L. Rubadeux, and H. H. Coe. "Effects of Planetary Speed-Reduction Ratio on Mean Service Life." Journal of Mechanical Design 120, no. 1 (1998): 113–18. http://dx.doi.org/10.1115/1.2826662.

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Planetary-gear transmissions are compact speed reductions which use parallel-load paths to transmit high power. The range of possible reduction ratios is bounded from below and above by limits on the relative size of the planet gears. For a single-plane planetary transmission, the speed-reduction ratio must be greater than two for planet gears to exist. As the ratio increases, so does the size of the planets relative to the sizes of the sun and ring. Which ratio is best for a planetary reduction can be resolved by studying a series of optimal designs. In this series, each design is obtained by

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Tong, Jing Lin, Yun Bo Shen, and Xiao Bo Wang. "Design of Face Gear Drive with Spur Pinion and Experimental Test." Applied Mechanics and Materials 42 (November 2010): 408–12. http://dx.doi.org/10.4028/www.scientific.net/amm.42.408.

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Based on the technology of face gear shaping, the tooth surface design and geometry were investigated that include tooth generation, limiting inner and outer radii. The computer were applied to simulated tooth contact analysis and transmission ratio of gear drive. A novice method is proposed for face gear generated by use of a general shaper. A face gear with 77 teeth was generated successfully by the shaper. For the purpose to certificate the bearing contact of gear drive, an experimental investigation was also developed in the bevel gear meshing machine. The results show the experimental bea

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Wang, Guangxin, Lili Zhu, Peng Wang, and Jia Deng. "Meshing and Bearing Analysis of Nutation Drive with Face Gear." Recent Patents on Mechanical Engineering 13, no. 4 (2020): 352–65. http://dx.doi.org/10.2174/2212797613999200420161031.

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Background: Nutation drive is being extensively investigated due to its ability to achieve a high reduction ratio with a compact structure and the potential for low vibration, high efficiency and design flexibility. However, many problems including the difficulty to process the inner bevel gear, less number of teeth in engagement and not being suitable for high-power transmission have restricted its development. Objective: The purpose of this paper is to analyze the contact strength of a patent about a new nutation drive developed based on meshing between two face gears, which has the advantag

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WANG, Yu-ning, Zhang Zhao-gang, Lin Yi-zhen, and Yin Ming-ang. "Dynamic Analysis of Shaft Structure Based on ANSYS/LS-DYNA." MATEC Web of Conferences 179 (2018): 01019. http://dx.doi.org/10.1051/matecconf/201817901019.

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In this study, a part of the shafting structure of the accessory transmission system consisting of shaft-gear-bearing is studied. ANSYS/LS-DYNA explicit dynamics simulation software is used to simulate the dynamics of the shaft structure. It compares and analyzes the overall shaft structure, gears and bearings. The simulation results show that: The place where the equivalent stress of the shaft structure is relatively large is mainly concentrated at the tooth root and the tooth surface, where the stress is mainly in the vicinity of two or three teeth. With the change of time, the maximum equiv

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Bo, Shen Yun, Xuan Liu, and Li Jun Wang. "Design of double-crowned tooth geometry for spiroid gear produced by precision casting process." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 232, no. 6 (2016): 1021–30. http://dx.doi.org/10.1177/0954405416661003.

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A novel double-crowned tooth geometry is proposed by the application of ease-off topography for spiroid gear manufactured by precision casting process, with the goals of localizing the bearing contact and obtaining a perfect function of transmission errors. The modified tooth surface is applied as the reference geometry to machine the die cavity geometry that will produce such geometry of the gears. The tooth geometry of crowned gear was achieved first from a pre-designed controllable function of transmission errors along the desired contact path. Then, the desired ease-off topography along th

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M. Aliyev, Alesker. "MODEL OF RELIABILITY OF PLANETARY GEARS." Journal of Modern Technology and Engineering 9, no. 3 (2024): 202–16. https://doi.org/10.62476/jmte93202.

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A model of the reliability of planetary gears is described, in which the epicycle of a stationary sun gear is connected to the input shaft and the carrier is connected to the output shaft. The input and output shafts are coaxial, and it is assumed that these shafts are loaded only with torques be3 and bending forces. Axial and lateral forces are not considered. Gears of this type are usually used in helicopter main rotor drive systems, as well as in other cases where it is necessary to provide a large transmission ratio. The reliability model is based on a Weibull distribution of the reliabili

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Tsay, M.-F., and Z.-H. Fong. "Novel profile modification methodology for moulded face-gear drives." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 221, no. 6 (2007): 715–25. http://dx.doi.org/10.1243/0954406jmes321.

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Owing to modern forging and moulding technology, not only are increasing numbers of face gears being made by die, but the quality of the moulded face gear is comparable to that for gears made by a shaping process. The contact pattern of the face gear drive is designed in a manner similar to that for the bevel gear, with a localized bearing that reduces the sensitivity of axes misalignment. This paper proposes a novel profile modification methodology for the moulded face-gear drive that enhances the controllability of the contact pattern and transmission characteristics. Specifically, a skew do

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Kim, Jeong Gil, Geun Ho Lee, Young Jun Park, Yong Yun Nam, and Tae Hyong Chong. "Study of Load Distribution and Sharing Characteristics of Planetary Geartrain for Wind Turbines." Applied Mechanics and Materials 86 (August 2011): 674–79. http://dx.doi.org/10.4028/www.scientific.net/amm.86.674.

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Most wind turbine gearboxes and pitch/yaw reducers consist of several planetary geartrains. Planetary geartrains allow gearboxes to be small, light, low noise, and efficient. The most important factors in the planetary geartrain design are load sharing among the planet gears and load distribution on the gear tooth flank. This study was conducted to analyze the load sharing and distribution in reducers with and without a slewing bearing. Load sharing and distribution of a pitch reducer without a slewing bearing were very uniform and even. However, in the other case, they were non-uniform and un

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Yuan, Xiaojie, Xiaoyu Che, Rupeng Zhu, and Weifang Chen. "Effect of Bearing Support Parameters on the Radial and Angular Deformation of Rotor Shaft Gear Based on CRDRS Support Configuration with Intermediate Bearing Support." Machines 13, no. 6 (2025): 513. https://doi.org/10.3390/machines13060513.

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The rotor shaft is a critical component responsible for transmitting engine power to the helicopter’s rotor. Deformation of the rotor shaft can affect the meshing performance of the output stage gears in the main gearbox, thereby affecting load transfer efficiency. By adjusting the support parameters of the rotor shaft, deformation at critical positions can be minimized, and the meshing performance of the output stage gears can be improved. Therefore, it is imperative to investigate the influence of rotor shaft support parameters on the deformation of the rotor shaft. This paper takes coaxial

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Білогуб, Олександр Віталійович, Ігор Сергійович Романенко, Олександр Володимирович Гудошник та Сергій Олександрович Тристан. "Працездатність підшипників ковзання як опор шестерень основного паливного насосу ГТД". Aerospace technic and technology, № 2 (28 квітня 2021): 52–58. http://dx.doi.org/10.32620/aktt.2021.2.06.

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The paper is about the performance capability of the journal bearings as a support of the fuel gear pump for gas turbine engines (GTE). Supports of the external gear pump usually operate in semi-dry friction conditions, which reduces residual life and is one of the limiting factors. For this investigation, the serial gear pump was chosen with the following parameters: the number of teeth z = 14, module m = 3.8, gear-loading Р = 7800 N. The authors have studied options for a pump with an electrical and mechanical (from the rotor of the GTE) drive. The main criterion for studying the bearing cap

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Kojima, Hiroyuki. "Special Issue on Gear Components and Actuators." International Journal of Automation Technology 2, no. 5 (2008): 333. http://dx.doi.org/10.20965/ijat.2008.p0333.

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Components such as gears, bearings, and shafts are essential to effective automation, ensuring reliable, cost-effective design. Actuators such as DC, AC, and stepping motors are equally important to automation. Studies in mechatronics make equal use of both gears and actuators in the practical construction of automated equipment. This special issue on gears and actuators looks at studies on load bearing capacity in mechanical system design, including micropitting generation and high-speed finishing of hard gear teeth for garnering insights into mechanisms behind successful automation. It also

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Manoj Kumar, A. P., and Nayak S. Nagaraj. "Calculation of Friction Coefficients in Journal Bearings to Determine the Turning Gear Motor Power." Applied Mechanics and Materials 232 (November 2012): 869–73. http://dx.doi.org/10.4028/www.scientific.net/amm.232.869.

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Steam turbine turning gear is a gear train, driven by electric motor, which is used to drive the rotor at a given speed and capable of breaking away the turbine and its load equipment from a standstill. Steam turbine rotor trains are supported by journal bearing which require lube oil for cooling. The normal turning gear operation requires that lube oil and the lift oil systems must be in-service in order to reduce the friction coefficient at the journal bearings during breakaway. The rotor train breakaway and running torque is the resisting moments at each of the journal bearings. The resisti

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Wu, Xiongxi, Qifeng Gao, and Zesong Li. "Mathematical and Finite Element Modeling of Micro-Modification for Marine Gear." International Journal of Rotating Machinery 2015 (2015): 1–7. http://dx.doi.org/10.1155/2015/902941.

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Based on the computer simulation technique, this paper used the professional gear design software MASTA and finite element software ANSYS combined with the method of gear micro-modification to redesign the gear profile and eventually realized the optimization design of gear micro-modification. Then the gear transmission model of one-level reducer was established to simulate and analyze the contact equivalent stress, transmission error, and meshing impact before and after gear modification. By comparing the simulations results it is found that gear micro-modification can lower meshing impact lo

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Maliha, Rafiq, Can U. Dogˇruer, and H. Nevzat O¨zgu¨ven. "Nonlinear Dynamic Modeling of Gear-Shaft-Disk-Bearing Systems Using Finite Elements and Describing Functions." Journal of Mechanical Design 126, no. 3 (2003): 534–41. http://dx.doi.org/10.1115/1.1711819.

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This study presents a new nonlinear dynamic model for a gear-shaft-disk-bearing system. A nonlinear dynamic model of a spur gear pair is coupled with linear finite element models of shafts carrying them, and with discrete models of bearings and disks. The nonlinear elasticity term resulting from backlash is expressed by a describing function, and a method developed in previous studies to determine multi harmonic responses of nonlinear multi-degree-of-freedom systems is employed for the solution. The excitations considered in the model are external static torque and internal excitation caused b

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Seol, I. H., and F. L. Litvin. "Computerized Design, Generation and Simulation of Meshing and Contact of Modified Involute, Klingelnberg and Flender Type Worm-Gear Drives." Journal of Mechanical Design 118, no. 4 (1996): 551–55. http://dx.doi.org/10.1115/1.2826927.

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The worm and worm-gear tooth surfaces of existing worm-gear drive designs are in line contact at every instant and the gear drive is very sensitive to misalignment. Errors of alignment cause shifting of the bearing contact and transmission errors. Methods for computerized simulation of meshing and contact of misaligned worm-gear drives of existing design are proposed. Also, modification of worm-gear drive geometry that provides a localized and stable bearing contact with reduced sensitivity to misalignment is described. Methods for computerized simulation of meshing and contact of worm-gear dr

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Jintao, Mo, Gu Chaohua, Pan Xiaohong, Zheng Shuiying, and Ying Guangyao. "Experimental and numerical analysis of a self-circulating oil bearing system for gear pumps." Industrial Lubrication and Tribology 70, no. 1 (2018): 115–25. http://dx.doi.org/10.1108/ilt-07-2016-0143.

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Purpose For moderate pressure and high pressure gear pumps, the temperature failure problem of bearings is now of considerable concern because of their heavy loads. However, the compact structure and the efficiency consideration make it extremely difficult to improve the bearing cooling. A self-circulating oil bearing system is developed for gear pumps with self-lubricating bearings to solve this problem. The oil is aspirated in from the low pressure chamber of the gear pump and discharged to the same chamber by using the pressure difference in the journal bearing, thus achieving the self-circ

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Patnala, Raghu Vamsi, Suresh P. R, and Sasikumar M. P. "Methodology to Analyse Power Losses in Off-Highway Power Train Aggregates for Two Different Lubricants." International Journal of Current Engineering and Technology 10, no. 04 (2020): 507–12. http://dx.doi.org/10.14741/ijcet/v.10.4.2.

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Powertrain aggregates used in mining equipment are complex, and it comprises of primary aggregates like an engine, powershift transmission, differential and final drive, which in-turn includes many tribological systems including gears, bearings, and shafts. Evaluating the effect of different lubricants on preliminary design phase is a crucial challenge, especially identifying various power losses such as gear meshing, oil churnings and the bearings losses in several machine elements on single go is a complex one. To identify combined power losses in gear and bearings, an analytical model or an

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Plekhanov, F. I., and E. F. Vychuzhanina. "A Study of the Stress-Strain State of the Planetary Carrier Cheek." Proceedings of Higher Educational Institutions. Маchine Building, no. 8 (713) (August 2019): 3–9. http://dx.doi.org/10.18698/0536-1044-2019-8-3-9.

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Planetary gears are commonly used in drive technology due to their high load capacity and good weight and size parameters. Among planetary gears, multi-satellite structures with a minimum number of excessive links are most widely used. They have a close to uniform distribution of the load in the engaged gears, which has a positive effect on the strength and bearing capacity of the drive. Such designs include planetary gears, the satellites of which are mounted on spherical bearings, and one of the main links (most often the sun gear) is self-aligning. This provides a theoretically uniform dist

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Asgharifard-Sharabiani, P., A. Hannaneh, and M. Nikkhah-Bahrami. "Calculation of helical gear’s basic parameters using COP-data acquired by optical 3D digitizer." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 225, no. 12 (2011): 2953–62. http://dx.doi.org/10.1177/0954406211409841.

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Gears are industrial components with a precise geometry. Identification of their basic parameters plays an important role in their reverse design and quality control process. This article describes a new approach for the calculation of helical gear’s basic parameters using optical data acquired by 3D digitizer. This approach is implemented by acquiring cloud-of-points data (COP-data) from the bearing seats and gear tooth surface. Cylinder surface fitting through COP-data acquired from bearing seats is performed for the determination of gear axis of rotation. In a final step, involute helicoid

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Talbot, D., A. Kahraman, AW Stilwell, A. Singh, and I. Napau. "Mechanical power losses of full-complement needle bearings of planetary gear sets: Model and experiments." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 230, no. 5 (2015): 839–55. http://dx.doi.org/10.1177/0954406215587539.

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Full-complement (loose) needle bearings are used widely in automatic transmissions as planetary gear set planet bearings due to their cost advantages and high load-carrying capacity. This study provides theoretical and experimental investigations of the efficiency performance of full-complement needle bearings in a planetary gear set. An experimental setup is introduced to measure planetary gear set power losses. A number of full-complement needle bearing variations as well as a baseline caged needle bearing arrangement are tested within ranges of speed, torque, and oil temperature as well as

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Litvin, F. L., N. X. Chen, J. Lu, and R. F. Handschuh. "Computerized Design and Generation of Low-Noise Helical Gears with Modified Surface Topology." Journal of Mechanical Design 117, no. 2A (1995): 254–61. http://dx.doi.org/10.1115/1.2826131.

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An approach for the design and generation of low-noise helical gears with localized bearing contact is proposed. The approach is applied to double circular arc helical gears and modified involute helical gears. The reduction of noise and vibration is achieved by application of a predesigned parabolic function of transmission errors that is able to absorb a discontinuous linear function of transmission errors caused by misalignment. The localization of the bearing contact is achieved by the mismatch of pinion-gear tooth surfaces. Computerized simulation of meshing and contact of the designed ge

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Zhang, Shu Yan, and Hui Guo. "Tooth Contact Analysis of Parabolic Gears with New Type of Profile." Applied Mechanics and Materials 365-366 (August 2013): 294–98. http://dx.doi.org/10.4028/www.scientific.net/amm.365-366.294.

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The meshing principle of a new kind of parabolic gear is introduced, and the tooth surface equations of parabolic gear are obtained. A tooth contact analysis to simulate meshing and contact is applied. The paper investigates the influence of misalignment on transmission errors and shift of bearing contact. Examples to illustrate the developed approaches are proposed. The research provides the basis for design of new high strength parabolic gears.

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Kahraman, A. "Dynamic Analysis of a Multi-Mesh Helical Gear Train." Journal of Mechanical Design 116, no. 3 (1994): 706–12. http://dx.doi.org/10.1115/1.2919440.

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In this paper, the dynamic behavior of a multi-mesh helical gear train has been studied. The gear train consists of three helical gears, with one of the gears in mesh with the other two. A three dimensional dynamic model which includes transverse, torsional, axial and rotational (rocking) motions of the flexibility mounted gears has been developed. Two different loading conditions have been identified. In case-I, the system is driven by the gear in the middle, and in case-II, the system is driven by one of the gears at either end of the gear train. The phase difference between the two gear mes

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He, Lu Zhong, Qin Zhou, Yao Sen Du, and Bin Bin Li. "Design and Finite-Element Analysis on Double-Circular-Arc Gear of the Turbodrill Reducer." Advanced Materials Research 926-930 (May 2014): 1247–52. http://dx.doi.org/10.4028/www.scientific.net/amr.926-930.1247.

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The double-circular-arc gear bearing capacity is the key problems for realizing the low speed and high torque work demands of small-diameter deep-well turbodrill reducer. Double double-arc gear shaft structure is adopted for improving the gear bearing capacity Based on the 2K-H-NGW type planetary gear transmission. Increase modulus and decrease teeth number properly can improve the double-circular-arc gear capacity on the premise of limited radial size. This article analyze the gear bending stress based on ANSYS and simulation results show that stress mainly concentrated on tooth root and toot

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Seol, I. H. "The Design, Generation, and Simulation of Meshing of Worm-Gear Drive With Longitudinally Localized Contacts." Journal of Mechanical Design 122, no. 2 (2000): 201–6. http://dx.doi.org/10.1115/1.533568.

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The design and simulation of meshing of a single enveloping worm-gear drive with a localized bearing contact is considered. The bearing contact has a longitudinal direction and two branches of contact path. The purpose of localization is to reduce the sensitivity of the worm-gear drive to misalignment. The author’s approach for localization of bearing contact is based on the proper mismatch of the surfaces of the hob and drive worm. The developed computer program allows the investigation of the influence of misalignment on the shift of the bearing contact and the determination of the transmiss

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Thai, Nguyen Hong, and Phung Van Thom. "Replacing the involute profile with an improved cycloid profile to improve the bearing capacity for the elliptical gear drives." Vietnam Journal of Science and Technology 62, no. 3 (2024): 588–600. http://dx.doi.org/10.15625/2525-2518/18247.

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The involute curve is the most widely used in the design of tooth profiles for non-circular gears (NCGs) because of its mathematical simplicity and convenience for design and manufacture. Still, the condition to avoid undercutting often results in a large number of teeth and a small tooth size that reduces the load capacity of the gear drives. On the other hand, in elliptical gears (EGs), a particular case of NCGs, the unequal radii of the centrodes lead to unequal geometric shapes of the teeth arranged on the gear. To overcome the above phenomena and improve the load capacity of the gear driv

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