Automobile differential mechanism

Abstract

The invention discloses an automobile differential mechanism. The automobile differential mechanism comprises a shell, a wheel axle, half axle gears, planetary gears, a big bevel gear, a central spindle, a small bevel gear and a dead axle. One side of the shell is fixedly connected with the big bevel gear; the small bevel gear mounted at the axle end of the dead axle is engaged with the big bevel gear. The wheel axle is respectively arranged in the two transverse through hole of the shell; the wheel axle which extends inwards is provided with the half axle gears; the central spindle runs through the two lengthways through holes and the two planetary gears; the two planetary gears which rotate around the central spindle are engaged with the two half axle gears to compose a differential rotation mechanism. In order to enhance bearing capability of the planetary gears and the half axle gears in the differential mechanism, improve drive balance and decrease engaging vibration and engaging noise, helical bevel gears with short teeth and correction of the flank shape are adopted to serve as the internally arranged planetary gears and the half axle gears. Although the tooth spiral angles are small, at least three teeth are engaged synchronously when the teeth are engaged. Due to such high overlap ratio, engaging and engaging-out impact is reduced, and accordingly drive stability is increased.

Description

technical field [0001] The present invention relates to a reduction transmission device, in particular, the present invention relates to a vehicle differential, especially a vehicle differential with a built-in helical bevel gear. Background technique [0002] The differential is an essential reduction device for cars, engineering vehicles and agricultural vehicles, and it is configured in the drive axle for differential transmission. The main components of the differential are a pair of planetary gears and a pair of side gears, and the symmetrically arranged planetary gears and side gears mesh with each other. The planetary gears and half-shaft gears of commercially available automotive differentials are all straight bevel gears. The traditional design technology of straight bevel gears is relatively mature, and the tooth shape is also very simple. The industry adopts precision forging forming technology to easily achieve efficient production. Although the straight-toothed...

AI Technical Summary

Problems solved by technology

Although the straight-toothed bevel gear manufactured by the prior art can meet the requirements of differential transmission, the matching quality is difficult to meet the expected requirements

The specific problems are reflected in the instantaneous line contact when the straight bevel gear meshes, the meshing degree of the tooth surface is small, the transmission stability is not good enough, and the vibration and noise are difficult to meet the standards. These obvious shortcomings constitute the obstacle of the complete vehicle matching.

For example, the transmission torque of engineering vehicles and agricultural vehicles is relatively large, and the conventionally designed straight bevel gears have insufficient load capacity due to the small meshing degree of tooth surface engagement.

In order to overcome the fragile problem of planetary gears and half-shaft gears matching the existing differential, the industry generally adopts a scheme of enlarging the tooth design to enhance the bearing capacity. The disadvantage of this scheme is that it increases the volume of the differential

A car is a means of transportation with high requirements for ride comfort. Vehicle manufacturers have high requirements for the manufacturing precision of the planetary gears and side gears that are matched with the differential. Although this technical requirement is correct, it costs a lot. increase manufacturing difficulty

In particular, the existing precision forging process in this industry cannot meet the high-precision processing requirements. If the mature and efficient precision forging process is abandoned and other forming processes are used, the manufacturing cost will inevitably increase.

Images