Gear with epicycloid-shaped tooth trace

Abstract

The invention discloses a gear with an epicycloid-shaped tooth trace, all the intersecting lines of the wheel teeth of the gear with a reference cylinder, a root cylinder and a tip cylinder thereof are prolate epicycloids, and all the intersecting lines of the wheel teeth of a cylindrical gear engaged with the gear with the reference cylinder, the root cylinder and the tip cylinder thereof are also prolate epicycloids. In a central section in the direction of tooth width, both the toothed curves of the gear and the cylindrical gear engaged with the gear are involutes, i.e. in the central section in the direction of tooth width, the engagement of the pair of gears is equivalent to the engagement between traditional involute gears, so that the gear has constant transmission ratio. In other sections parallel to the central section, the tooth profiles of the gear and the mating cylindrical gear mutually correspond in a concavo-convex mode, the synthetic curvature between contact surfaces is small, and the synthetic curvature radius is large, so that the gear has large coincidence degree, stable transmission, high bearing capacity and long service life. The invention has the advantages that the deficiencies of small coincidence degree, large impact vibration and the like in straight gear transmission are overcome, and the axial thrust problem existing in helical gear transmission is solved. The invention is suitable for occasions with high speed, heavy load and high-power transmission and can be used as renewal products of straight gears and helical gears at present.

Description

technical field [0001] The invention relates to a gear, in particular to a gear whose tooth line is an epicycloid. Background technique [0002] Gear transmission is a mechanical transmission that uses the teeth of two gears to mesh with each other to transmit power and motion. It has the characteristics of simple structure, constant instantaneous transmission ratio, reliable operation, high efficiency, long life, and large range of power, speed and size. For example, the transmitted power can range from very small to hundreds of thousands of kilowatts, the speed can reach 100,000 rpm, the peripheral speed can reach up to 300 m / s, the diameter of the gear can range from a few millimeters to more than 20 meters, and the efficiency of single-stage transmission can be achieved. up to 0.96-0.99. Therefore, among all mechanical transmissions, gear transmission is the most widely used. [0003] The gears currently used in gear transmission mainly include straight teeth and helic...

AI Technical Summary

Problems solved by technology

However, due to the existence of the helix angle, the helical gear will generate axial thrust during transmission, which will increase the friction loss in the transmission device

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