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Power Transmission and Gearing Systems
Published in Wei Tong, Mechanical Design and Manufacturing of Electric Motors, 2022
Hypoid gears are similar to spiral bevel gears except that the pinion is offset from the horizontal centerline of the face gear. Unlike bevel gears that the shafts are in the same plane, hypoid gears can engage with the axes in different planes. This design allows the pinion to be larger in diameter and provides a high contact ratio. Therefore, it permits the use of high gear ratios. A pair of hypoid gears always has opposite hand and the spiral angle of the pinion is usually larger than the angle of the gear [9.71]. Hypoid gears combine the rolling action and high tooth pressure of spiral bevels gears with the sliding action of worm gears. Therefore, their efficiencies range between spiral bevel gears and worm gears.
Application Topics
Published in Q. Jane Wang, Dong Zhu, Interfacial Mechanics, 2019
Spiral bevel and hypoid gears are key components widely used for transmitting significant power and motion in various vehicles and engineering machineries. In comparison with straight bevel gears, they can better handle heavier torque loads at higher operating speeds. In engineering applications, operation of hypoid gears is usually smoother and quieter than that of straight and spiral bevel gears. However, as in all gear sets with nonparallel nonintersecting axes, high sliding usually takes place across the tooth flanks in hypoid gears. Therefore, hypoid gears often encounter various problems, such as low efficiency, possible high operating temperature, high churning loss, and excessive sliding wear.
A Brief Overview on the Evolution of Gear Art: Design and Production of Gears, Gear Science
Published in Stephen P. Radzevich, Advances in Gear Design and Manufacture, 2019
Mr. Trbojevich's most notable work that brought him international recognition was the invention of the “hypoid gear.” First published in 1923, it was a new type of spiral bevel gear employing previously unexploited mathematical techniques. The “hypoid gear” is used in a majority of all cars, trucks, and military vehicles today. Together with his invention of the tools and machines necessary for its manufacture, the “hypoid gear” became an integral part of the final drive mechanism of automobiles by 1931. Its effect was immediately apparent in that the overall height of rear-drive passenger automobiles was reduced by at least four inches.
Numerical and experimental investigation of splashing oil flow in a hypoid gearbox
Published in Engineering Applications of Computational Fluid Mechanics, 2018
Qianlei Peng, Liangjin Gui, Zijie Fan
The power loss was first measured when the wheel and pinion were immersed in oil and rotated at a certain speed. Then, the power loss was measured when the wheel and pinion were not immersed in oil and rotated at the same rotation speed. For the non-immersed condition, a small quantity of oil was supplied to the gear mesh region and the bearing location, assuming that the values of friction power loss for the two conditions were approximately equal (Ariura, Ueno, Sunaga, & Sunamoto, 1973). where is the friction power loss of the hypoid wheel and pinion, is the friction power loss of the bearings, is the churning loss of the hypoid wheel and pinion, is the churning loss of the bearings, and is the power loss of the seals.
Meshing Efficiency Analysis of Modified Cycloidal Gear Used in the RV Reducer
Published in Tribology Transactions, 2019
Ruoyu Wang, Fengqiang Gao, Meng Lu, Tundong Liu
Gear contact load analysis has always been a hot topic for researchers. Liu, et al. (12) built a dynamic load model to analyze the lubrication of spur gears. Mohammadpour, et al. (14) conducted multiphysics investigations on the dynamics of differential hypoid gears. These papers are suitable for dynamic analysis of gear loads. However, due to the complexity of modified cycloid pin transmissions, it is difficult to perform dynamic load analysis. Considering that the RV reducer efficiency test is carried out under a constant rotating speed, the acceleration term is generally small. It will be convenient for simulation to simplify the model as a quasistatic model in this article.
Prediction and optimization of lubrication performance for a transfer case based on computational fluid dynamics
Published in Engineering Applications of Computational Fluid Mechanics, 2019
LiQing Chen, PanPan Ma, JunLiang Tian, XiuTian Liang
In the current study, a model was proposed for transfer cases considering two-phase flow based on the VOF method. Afterwards, different scenarios were simulated, considering the lubricant immersion depth and gear speed as the independent variables. It was proved that both too much or too little lubricant volume would affect the lubrication performance, and the optimal lubricant volume was obtained, accounting for 66.69% of the total volume. In addition, the helical gear was preferred over the hypoid gear as the driving gear in terms of lubrication performance with the increase of lubricant volume.