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Power Transmission and Gearing Systems
Published in Wei Tong, Mechanical Design and Manufacturing of Electric Motors, 2022
Bevel gears are conically shaped gears that transmit power between two intersecting orthogonal axles. Manufactured in pairs, they are widely used in the machine tools, mining machinery, aerospace equipment, robots, forklift trucks, boat actuators and propellers, high-speed offset printing, packaging machinery, polyethylene sheets, automobile differentials, and railroad transmissions. However, this type of gearing system provides limited gear ratios; the maximum gear ratio is about 10:1 per gear set. Moreover, bevel gears are not recommended at high operating speeds due to high noise.
Gear Types and Nomenclature
Published in Stephen P. Radzevich, Dudley's Handbook of Practical Gear Design and Manufacture, 2021
Bevel gears. There are four basic types of bevel gears: straight, Zerol1, spiral, and skew tooth. In addition, there are three different manufacturing methods (face milling, face hobbing, and tapered hobbing) that are employed to produce true curved tooth bevel gears, each of which produces different tooth geometry. In our discussion herein we address the overall generic attributes of the different types of bevel gears without addressing the manufacturing variations.
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 Mixed TEHL Model for the Prediction of Thermal Effect on Lubrication Performance in Spiral Bevel Gears
Published in Tribology Transactions, 2020
Daofei Wang, Si Ren, Ying Zhang, Wei Pu
Spiral bevel gears have many advantages, such as transmission stability, large carrying capacity, and space transmission capacity. They are widely used in heavy-duty trucks, construction machinery, and aircraft engines. The characteristics of the velocity vector on the meshing tooth surface in spiral bevel gears are very different from those of ordinary cylindrical gears and bearings. The velocity vectors of two surfaces commonly do not coincide with the main axes of the Hertzian contact zone, which may lead to high sliding speeds. Scuffing is a major failure mode for spiral bevel gears subjected to severe heat generation, in addition to ordinary failure forms like contact fatigue and wear. Therefore, it is of significant importance to study thermal effects on the lubrication performance and film breakdown in spiral bevel gears.