Mixed lubrication analysis of modified cycloidal gear used in the RV reducer

Wei, Bo; Wang, Jiaxu; Zhou, Guangwu; Yang, Ronghua; Zhou, Hongjun; He, Tao

doi:10.1177/1350650115593301

Cited by 39 publications

(7 citation statements)

References 18 publications

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“…Wei et al [11] established a mixed lubrication model for cycloidal pinwheels and discussed the effects of contact load and radius of curvature on lubrication conditions. Liu et al [12] developed a line contact model of thermoelastic hydrodynamic lubrication under the condition of an ultrathin film and studied the influence of speed and dynamic load on the lubrication performance of a spur gear pair.…”

Section: Concli and Gorlamentioning

confidence: 99%

Research on the Lubrication Characteristics of Harmonic Gear Transmission Meshing Areas

Fan

Wei

et al. 2020

SV-JME

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To analyse the lubrication characteristics of harmonic gears and lay the foundation for the study of its gear tooth failure performance and dynamic characteristics, based on the tooth contact geometry of harmonic gear, the integrated curvature radius, tooth load, and entrainment velocity at the meshing point of the gear teeth in the harmonic gear transmission are analysed. A finite-length line contact elastohydrodynamic lubrication (EHL) model for harmonic gears is established. The numerical calculation method is used to solve the oil film thickness and pressure distribution in the lubricating area, and the effects of rotational speed and temperature on the contacting load ratio and film thickness ratio of the meshing area are studied, as well as the change of oil film stiffness under different working conditions. The results show that along the meshing direction, the pressure is small at the end and reaches a peak at the centre, and the film thickness is the largest in the entrance area and is evenly distributed in the centre contact area. As the speed increases, the gear tooth contact load ratio decreases, the oil film thickness ratio increases, the stiffness of the oil film decreases significantly, and the lubrication effect is improved; but the temperature has the opposite effect. Proper increase of rotation speed and decrease of oil temperature can effectively improve the lubrication characteristics of the system.

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Section: Concli and Gorlamentioning

confidence: 99%

Research on the Lubrication Characteristics of Harmonic Gear Transmission Meshing Areas

Fan

Wei

et al. 2020

SV-JME

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“…In recent years, studies of cycloidal-pin transmissions have mainly concentrated on the following aspects: innovation in transmission principles, 1–7 cycloidal tooth profile design, 8–15 transmission error analysis, 16–20 load and stress analysis, 21–23 structure and performance optimization, 24–28 their dynamics, 29–31 and lubrication analysis. 32–34…”

Section: Introductionmentioning

confidence: 99%

“…For obtaining the better lubrication of an RV reducer, a mixed lubrication model considering the effects of modification method, amount of modification, edge radius, and rotation speed was established by Bo et al. 34…”

Section: Introductionmentioning

confidence: 99%

A dynamic model to predict the number of pins to transmit load in a cycloidal reducer with assembling clearance

2018

Proceedings of the Institution of Mechanical Engineers, Part C:

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In the ideal design of a cycloidal reducer, the tooth profile of cycloidal gear can make contact with all pin teeth on the pinwheel, wherein half of the pin teeth participate in load transmission. Meanwhile, the output holes on a cycloidal gear can maintain contact with all pins on the output disc and half of the output pins deliver load. However, under the influence of the assembling clearance caused by tooth modification, manufacturing tolerance, or machining error, the numbers of pins that participate in force transmission on both pinwheel and output disc fails to reach half of the total available. The objective of this research is to present a dynamic model to precisely predict the number of pins used to transmit load in a cycloidal reducer with assembling clearance. The methods for contact detection among the transmitting components are given in detail. In modeling of the contacts, both normal contact, and tangential friction, forces are considered. Finally, a typical cycloidal reducer with a single cycloidal gear is modeled and used as an example to analyze the variation of the number of pins that take part in load-bearing work under the influences of assembling clearance and external torque.

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“…A series of rollers with different crowning, logarithmic profiles, chamfering and fillet was numerically analyzed, and the influence of the edge properties on the pressure and film thickness were studied by Shirzadegan et al (2016) and Najjari and Guilbault (2014). Bo et al (2016) studied the lubrication analysis of cycloid gear but did not study the lubrication effect of the fillet modification and rheological properties of lubricants.…”

Section: Introductionmentioning

confidence: 99%

Analysis of mixed lubrication of RV reducer turning arm roller bearing

Zhang

Wang

Zhou

et al. 2018

ILT

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Purpose This paper aims to solve the lubrication failures in the turning arm bearing of RV reducer, give some help in perfecting the bearing structure design and provide theoretical basis for the reducer’s performance improvement. Design/methodology/approach The paper establishes a mixed lubrication analysis model to study performance parameters. According to the discretization of parameters and iteration of equations, numerical simulation and theoretical analysis are achieved in computational process. Findings Considering influences of contact load, real rough surface and realistic geometry of RV reducer turning arm roller bearing, the mixed lubrication analysis model is established to study the ratio of oil film thickness, pressure distribution and maximum von Mises stress in different speeds, temperatures and fillets. The results of mixed lubrication show that reasonable round corner modification, increase in temperature and speed, decrease of surface roughness and lubricant types can improve the lubrication performance. Originality/value The mixed lubrication analysis model is established to study the influences of contact load, real rough surface and realistic geometry of RV reducer turning arm roller bearing. Different speed, temperature, lubricant and fillet modification are also considered in the research to analyze oil film thickness, pressure distribution and maximum von Mises stress. These studies can optimize structural design of bearing and direct engineer operations.

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Mixed lubrication analysis of modified cycloidal gear used in the RV reducer

Cited by 39 publications

References 18 publications

Research on the Lubrication Characteristics of Harmonic Gear Transmission Meshing Areas

Research on the Lubrication Characteristics of Harmonic Gear Transmission Meshing Areas

A dynamic model to predict the number of pins to transmit load in a cycloidal reducer with assembling clearance

Analysis of mixed lubrication of RV reducer turning arm roller bearing

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