Drive axle of electric distribution torque

Patent metadata

Field	Value
Publication number	US-10065489-B2
Application number	US-201615018716-A
Country	US
Kind code	B2
Filing date	Feb 8, 2016
Priority date	Feb 11, 2015
Publication date	Sep 4, 2018
Grant date	Sep 4, 2018

Abstract

An electric drive axle comprises: a housing; a drive motor having an output shaft for outputting torque; a main reducer configured to perform two-stage reduction to amplify the torque outputted from the output shaft; a differential including a differential housing, a planetary gear shaft, a left and right drive shafts rotating about an axis of rotation; a torque vectoring motor; a double row planetary gear reduction mechanism configured to amplify power outputted from the torque vectoring motor; a double row planetary gear torque vectoring mechanism connected to the double row planetary gear reduction mechanism and configure to receive torque outputted from the double row planetary gear reduction mechanism and output reverse torque in contrast to the torque received; and a single row double planetary gear coupling mechanism providing opposite direction torques to the left and right drive shafts respectively.

First claim

The invention claimed is:

1. An electric drive axle, comprising:
a drive motor having an output shaft for outputting torque;
a main reducer for performing two-stage reduction to amplify the torque outputted from the output shaft; wherein the main reducer comprises a primary drive gear with a first gear shaft connected with the output shaft, a primary driven gear driven by the primary drive gear, a secondary drive gear sharing a second gear shaft with the primary driven gear, and a second driven gear driven by the second drive gear;
a differential for distributing the amplified torque received from the main reducer to a first and second drive shafts; wherein the differential comprises a differential case fixedly connected to the second driven gear, a planetary gear shaft, a first and second planetary gears respectively arranged on two ends of the planetary gear shaft, and a first and second bevel gears respectively connected with the first and second drive shafts;
a torque vectoring apparatus for torque vectoring; and
a drive axle housing having a first, second and third cavities; wherein the first and second cavities are coaxially arranged and communicated, and the second and third cavities are radially connected; and the torque vectoring apparatus is mounted in the first cavity, the differential is mounted in the second cavity, and the main reducer is mounted in the second and third cavities;
wherein the torque vectoring apparatus comprises:
a torque vectoring motor having an inner rotor for outputting torque;
a planetary gear reduction mechanism for receiving the torque from the inner rotor of the torque vectoring motor, and reducing the speed to amplify the torque;
a torque vectoring mechanism connected to said planetary gear reduction mechanism, for receiving the torque from the planetary gear reduction mechanism, and outputting the reverse torque in contrast to said torque received from the planetary gear reduction mechanism; and
a planetary gear coupling mechanism, comprising:
a first planetary carrier for receiving said reverse torque from the torque vectoring mechanism;
a first ring gear fixedly connected with the differential case, wherein the first ring gear and the differential case are configured to rotate together; and
a first sun gear fixedly connected with the first drive shaft.

2. The electric drive axle according to claim 1 , wherein the planetary gear reduction mechanism comprises a first reduction planetary gear train and a second reduction planetary gear train arranged in series, which have a common ring gear fixed on the drive axle housing; a second planetary carrier of the first reduction planetary gear train and a third sun gear of the second reduction planetary gear train are fixedly connected; a second sun gear of the first reduction planetary train and the inner rotor of the torque vectoring motor are fixedly connected; a third planetary carrier of the second reduction planetary gear train is configured to output power.

Assignees

• Jilin Univ China
• Univ Jilin

Inventors

• Wang Junnian
• Sun Nana
• Li Xiusen

Classifications

• F16H2048/364

  using electric or hydraulic motors · CPC title

• B60K2023/043

  Control means for varying left-right torque distribution, e.g. torque vectoring · CPC title

• F16H48/36

  characterised by intentionally generating speed difference between outputs · CPC title

• F16H48/38

  Constructional details (the outer casing comprising the differential and supporting input and output shafts F16H57/037) · CPC title

• B60K2001/001

  one motor mounted on a propulsion axle for rotating right and left wheels of this axle · CPC title