...Qingxiang Meng; Yaping Zhao; Jian Cui; Shibo Mu; Gongfa Li The kinematic-geometric lubrication theory, which combines the results from the elastohydrodynamic lubrication theory and the meshing theory for gearing, is put forward for a line-conjugate gear drive to investigate its global intrinsic...

...Jiafu Ruan; Xigui Wang; Yongmei Wang; Chen Li 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...

... by the Tribology Division of ASME for publication in the J ournal of T ribology . 16 11 2021 28 02 2022 01 03 2022 03 05 2022 wear in space environment BMG alloy selection 3D profilometry revision of Archard wear coefficients dry friction gears hardness sliding surfaces...

...Justino A. O. Cruz; Pedro M. T. Marques; Jorge H. O. Seabra; Jorge D. Castro This work studies the power loss in a real axle box gear transmission under no-load operating conditions. The influence of the rotational speed and of the lubricant viscosity was considered. An experimental strategy...

...Sheng Li; Ali Kolivand; Jing Wei This study establishes the critical temperature of scuffing for contacts of gears made of AISI 8620 steel alloy, lubricated by Dexron 6 oil. Through thermal mixed elastohydrodynamic lubrication modeling, experimental scuffing failures are simulated to determine...

...Jiang Zhao; Wei Sheng; Zhengminqing Li; Hong Zhang; Rupeng Zhu The relative sliding at the meshing point directly affects the contact and lubrication characteristics of the gear pair and is an important factor of gear wear and power loss. In this study, for investigation of a new type of low...

... 2021 05 10 2021 12 11 2021 three-body abrasion energy-based model wear comminution ore fragmentation energy efficiency abrasion wheel test abrasion friction gears surface fracture cracking wear As part of the early stages of the mineral processing activities, large...

...Junichi Hongu; Ryohei Horita; Takao Koide This study proposes a modification of the Matsumoto equation using a directional parameter of tooth surfaces to adapt various gear finishing processes. The directional parameters of a contact surface, which affect oil film formations, have been discussed...

...Yifan Lin; Yangzhi Chen; Changkun Ye; Yueling Lyu Parallel line gear pair (PLGP) can achieve pure rolling meshing along its theoretical contact curves under the ideal condition. However, the actual meshing positions may deviate from the theoretical ones under the actual operating conditions, which...

...S. Li; A. Kolivand; A. Anisetti Utilizing a computational approach, this study quantifies the onset of lubrication starvation for line contacts of rough surfaces operating under typical ranges of automotive gearing applications. The response parameter is selected as the critical film thickness...

...S. Sudhagar; Lokavarapu Bhaskara Rao This study was performed to measure the extent of wear of unlubricated spur gears on the involute tooth. Contacts that roll and slide normally undergo wear. When material removal occurs due to surface wear from the gear profile, the surface pressure in the gear...

... a single spur gear pair under both loaded and unloaded conditions such that load-independent (spin) and load-dependent (mechanical) components can be separated. With the assumption that gear pair and rolling element bearings constitute the bulk of the gearbox power loss, a second measurement system...

...) are the most significant two, followed by Si (silicon content), viscosity, and so on. This is because gears are generally made of steel, once abrasion occurs, naturally there will be more ferromagnetic particles and iron particles in the lubricant. As for Si, we know that impurities in lubricant cause wear...

.... The FSI model was used to investigate the effects of surface dents, plasticity and material inclusions under heavily loaded lubricated line contacts as can be found in gears and rolling element bearings. The results from the model exhibit excellent corroboration with published results based...

...Felix C. von Plehwe; Corina Schwitzke; Hans-Jörg Bauer To design gearboxes with very high power densities, an effective means of cooling the gears and knowledge of the achievable heat transfer coefficients are necessary. In this paper, a method to measure heat transfer coefficients for oil...

...A. S. Chimanpure; A. Kahraman; D. Talbot In this study, a non-Newtonian, transient, isothermal, mixed elastohydrodynamic lubrication (EHL) model is proposed for helical gear contacts. The model accounts for nonelliptical contacts subject to spatially varying sliding and rolling velocity fields...

... of helicopter mechanical transmissions, and it is under consideration as a lubrication solution for future electric powertrain where gearbox input speeds may be very high. The gear drag power losses are generally evaluated from either a churning power loss model for classic oil sump lubrication or a windage...

...Jiří Dobiáš; Jan Hrubý; Jozef Kordík; Svatopluk Pták; Jan Masák; Jaroslav Joch The paper is concerned with frictional study of a high-speed lubricated helical gear pair. The objectives were numerical evaluations of temperature and stress fields of the gear pair and the analysis of their frictional...

...Manuel Oehler; Bernd Sauer; Balázs Magyar In oil-lubricated worm gears, all moving components cause power losses during operation. These losses depend, among other things, on the viscosity of the lubricant used, which in turn is determined by the temperature present in the gearbox. The dependency...

...Mingyong Liu; Peidong Xu; Chunai Yan In this study, a comprehensive mechanical efficiency model based on the thermal elastohydrodynamic lubrication (TEHL) is developed for a helical gear pair. The tribological performance of the helical gear pair is evaluated in terms of the average film thickness...