Coaxial type two-gear variable-speed electric drive axle power assembly of commercial vehicle

Abstract

The invention discloses a coaxial type two-gear variable-speed electric drive axle power assembly of a commercial vehicle. The coaxial type two-gear variable-speed electric drive axle power assembly of the commercial vehicle comprises a drive motor, wherein a speed changer is connected to the output end of the drive motor and comprises a one-stage speed reduction planetary gear and a two-stage speed reduction planetary gear; the output end of the drive motor is connected with the one-stage speed reduction planetary gear through an external spline; the output end of the one-stage speed reduction planetary gear is connected with the two-stage speed reduction planetary gear; a synchronizer is connected to one end, far away from the one-stage speed reduction planetary gear, of the two-stage speed reduction planetary gear through a gear ring; a gear shifting mechanism is arranged on the outer side part of the synchronizer; a differential mechanism is arranged at the end part of the synchronizer; and a left half axle and a right half axle are arranged on the inner side of the differential mechanism. By adopting planetary gear transmission and utilizing small volumes, high speed ratio andmulti-gear transmission of the planetary gears, the transmission precision and the dynamic property are better; and a structure space of the power assembly is effectively reduced, so that energy conservation and environment protection are realized.

Description

Technical field [0001] The invention belongs to the technical field of new energy vehicles, and specifically relates to a coaxial two-speed variable speed electric drive axle power assembly of a commercial vehicle. Background technique [0002] Electric drive axle is the ultimate direction of new energy vehicle powertrain, and it is also the most obvious difference from traditional vehicle powertrain. In the future, the possibility of the traditional axle factory as a pure machinery industry sector cannot be said to be non-existent, but the integration of motors, electronic control, and axles is also the future development direction. The electric drive axle concentrates the axle, differential, reducer, transmission, motor, electronic control ECU, etc. on the axle, eliminating the need for the transmission shaft of the traditional car; [0003] The existing electric drive axle, single motor + single reducer type: the motor speed requirement is high, the technology is difficult, and...

AI Technical Summary

Problems solved by technology

[0003] The existing electric drive axle, single motor + single reducer type: high motor speed requirements, high technical difficulty, poor reliability; single motor + single transmission type: power interruption will occur when shifting gears, affecting driving comfort and safety; the external powertrain is often used, which requires structural weight and does not need to be used in high-horsepower systems; moreover, the external electric drive axle takes up a lot of space in the chassis and does not use the layout of other parts of the vehicle, especially the battery. The cruising range of the whole vehicle; dual-motor + dual-gearbox type: this structure adopts two sets of powertrain solutions, which increases the manufacturing cost and takes up a lot of chassis space. The external suspension system is not conducive to high suspension requirements and is not conducive to later maintenance; commercial use The chassis of the car mostly adopts the chassis layout of the overall bridge + leaf spring suspension. Part of the unsprung mass of the axle type is integrated with the electronic control part, which increases the unsprung mass and further occupies the limited space. For this reason, we A commercial vehicle coaxial two-speed transaxle powertrain is proposed

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