Two-stage speed reducer

Abstract

The invention provides a two-stage speed reducer comprising a connection member, an input gear shaft, a middle gear shaft, an one-stage reduction gear and a differential mechanism, wherein the input gear shaft, the middle gear shaft, the one-stage reduction gear and the differential mechanism are supported on a box body; the one-stage reduction gear is fixed on the middle gear shaft; the input gear shaft, the one-stage reduction gear, the middle gear shaft and the differential mechanism are connected sequentially, the differential mechanism has a two-stage speed reduction function and comprises a differential shaft, a satellite gear and a half shaft which are supported on a differential mechanism shell, the differential mechanism shell comprises a left part and a right part, and an integrative fixed gear is arranged outside the left differential mechanism shell and is meshed with the middle gear shaft to realize two-stage speed reduction. The two-stage speed reducer can be applied to an electric automobile, is connected with a DC motor to realize speed reduction and differential speed, can satisfy the low-noise requirement of the electric automobile, and has compact structure and stable property.

Description

Technical field [0001] The invention relates to a speed change device, in particular to a two-stage speed reduction device. Background technique [0002] At present, the deceleration in the power transmission is generally realized by a one-stage or two-stage reduction device, and the differential is realized by a differential. The first-stage reduction device must make the driving wheel very small in order to achieve a large speed ratio, while the driven wheel is made It is very large, which greatly reduces the strength of the pinion gear, the service life is relatively short, and the diameter of the large gear is too large, and the design of the shell is too large, which causes the shell to be easily deformed during the processing. The patent number is ZL200720064894, and the patent name is a utility model patent of "the main reduction device between the tractor gearbox and the drive axle". A two-stage reduction device is published, but its two-stage reduction passive gear adopt...

AI Technical Summary

Problems solved by technology

[0002] At present, the deceleration in the power transmission is generally realized through a first-stage or two-stage reduction device, and the differential speed is realized through a differential. The first-stage reduction device must make the driving wheel very small and the driven wheel to achieve a large speed ratio. It is very large, which greatly reduces the strength of the pinion gear, and the service life is relatively short, and the diameter of the large gear is too large, and the designed shell shape is also too large, resulting in easy deformation of the shell during processing, and there are also two-stage transmission deceleration, The patent number is ZL200720064894, and the utility model patent titled "Main reduction device for tractor gearbox and drive axle" discloses a two-stage reduction device, but the secondary reduction passive gear adopts the same differential speed The way of connecting the device cannot meet the requirements of low noise and compact structure.

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