Three-stage two-gear speed reducer and electric vehicle

Abstract

The invention provides a three-stage two-gear speed reducer and an electric vehicle, and relates to the technical field of mechanical transmission. The three-stage two-gear speed reducer comprises a shell, a first-stage speed reducing mechanism, a second-stage speed reducing mechanism, a third-stage speed reducing mechanism and a meshing sleeve, wherein the first-stage speed reducing mechanism, the second-stage speed reducing mechanism, the third-stage speed reducing mechanism and the meshing sleeve are arranged in the shell; the third-stage speed reducing mechanism is a driving and driven cylindrical gear speed reducing mechanism and comprises a driving cylindrical gear, and the first-stage speed reducing mechanism and the second-stage speed reducing mechanism are planetary speed reducingmechanisms which are arranged on the two axial sides of the driving cylindrical gear respectively; and the meshing sleeve is arranged between the second-stage speed reducing mechanism and the third-stage speed reducing mechanism and used for connecting the driving cylindrical gear with a planetary gear of the first-stage speed reducing mechanism or a planetary gear of the second-stage speed reducing mechanism, and two-gear conversion of the speed reducer is achieved. Compared with a three-stage speed reducer in the prior art, the three-stage two-gear speed reducer has the advantages that a multi-parallel-axis structure is avoided, the first-stage speed reducing mechanism and the second-stage speed reducing mechanism are arranged on the two sides of the driving cylindrical gear respectively, the layout is more compact, and the power density is high; meanwhile, stress deformation of parts is reduced, the rigidity of the parts is improved, unbalance loading is reduced, and the service life is prolonged.

Description

technical field [0001] The invention relates to the technical field of mechanical transmission, in particular to a three-stage two-speed reducer and an electric vehicle. Background technique [0002] Electric vehicle reducers generally adopt a multi-parallel shaft structure. For example, a three-stage reducer needs to use four parallel shafts. Such as patent CN107131252B discloses the parallel shaft variable speed reducer, its input shaft is provided with the driving gear set, the output shaft is provided with the output gear set with the same structure as the driving gear set, and the transition shaft is provided with the driving gear set and the output gear respectively. The transitional gear set with shaft meshing. The output gear set includes an internal gear and an external gear sleeved on the internal gear with a diameter larger than the internal gear. A connecting groove is provided at the joint of the two gears, and a connecting groove is provided for positioning and...

AI Technical Summary

Problems solved by technology

[0003] The gears of the reducer with parallel shaft structure are prone to bending after being loaded, resulting in partial load of the gear and increased noise, which will affect the comfort of drivers and passengers in severe cases; in addition, the internal layout of the reducer with parallel shaft structure is not compact, and the power per unit volume low density

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