CN-121973610-A - Integrated electric drive rear axle assembly

CN121973610ACN 121973610 ACN121973610 ACN 121973610ACN-121973610-A

Abstract

The utility model provides an integrated electric drive rear axle assembly, including the bridge package, a motor, differential mechanism, the rear cover, still including the mount pad that is used for installing motor and differential mechanism, mount pad and rear cover fixed connection, the mount pad includes the flange mount pad, set up a motor assembly chamber on the flange mount pad, a flange mount pad extends a support frame along motor assembly chamber one side axial, be used for supporting the motor, set up first bearing frame on the flange mount pad, be used for supporting differential mechanism, motor assembly intracavity sets up the diaxon hole, and one end is arranged in motor assembly chamber, make the motor shaft pass first shaft hole, the fixed output gear that sets up on the motor shaft, a reduction gear axle one end supports in the second shaft hole, the other end supports in the rear cover, the epaxial fixed driven gear that sets up of reduction gear, the driving gear meshes with driven gear, the driving gear meshes with the main reduction gear of differential mechanism, the rear cover is fixed with bridge package lock, make a portion of motor and differential mechanism be located the bridge package, and make the distance between motor shaft and the semi-axis be 3~6mm.

Inventors

LI JUN
GENG HAIBO
SUN WEIYUAN
GUO KAI
ZHANG TAO
LI JUNYING

Assignees

四川建安工业有限责任公司

Dates

Publication Date: 20260505
Application Date: 20260318

Claims (7)

1. An integrated electric drive rear axle assembly comprises a bridge bag (1), a motor (2), a differential mechanism (3) and a rear cover (6), and is characterized by further comprising a mounting seat (4) for mounting the motor and the differential mechanism, wherein the mounting seat (4) is fixedly connected with the rear cover (6), the mounting seat (4) comprises a flange mounting seat (42), a motor assembly cavity (421) is arranged on the flange mounting seat (42), the flange mounting seat (42) axially extends along one side of the motor assembly cavity (421) to form a supporting frame (41) for supporting the motor (2), a first bearing seat (), for supporting the differential mechanism (3), a two-shaft hole is arranged in the motor assembly cavity (421), one end of the motor shaft (21) penetrates through the first shaft hole (422), an output gear (22) is fixedly arranged on the motor shaft (21), one end of a speed reducer shaft (5) is supported in the second shaft hole (423), the other end of the speed reducer shaft (5) is supported on the rear cover (), a driving gear (51) is fixedly arranged on the speed reducer shaft (5), a driven gear (52) is meshed with the driving gear (51), and the driven gear (52) is meshed with the driving gear (52), the rear cover (6) is buckled and fixed with the bridge bag (1), so that a part of the motor (2) and the differential mechanism (3) are positioned in the bridge bag (1), and the distance between the motor shaft (21) and the half shaft is 3-6 mm.
2. An integrated electrically driven rear axle assembly as set forth in claim 1 wherein said motor shaft (21) is disposed side-by-side with a decelerator shaft (51).
3. The integrated electrically driven rear axle assembly of claim 1, further comprising a motor controller, wherein the motor controller is disposed within the axle package (1).
4. The integrated electrically driven rear axle assembly of claim 1, wherein the motor is cooled by an oil cooling system.
5. The integrated electrically driven rear axle assembly of claim 4, wherein the oil cooling system comprises an oil pump, an oil passage, a filter and a heat exchanger.
6. The integrated electric drive rear axle assembly of claim 1, wherein the end of the support frame (41) is provided with a connecting block (411), the connecting block (411) is provided with a bolt hole, and the mounting seat (4) is fixed with the rear cover (6) through a bolt.
7. An integrated electric drive rear assembly according to claim 1, characterized in that the rear housing (6) comprises a housing body (61) and an end cover (62), a third shaft hole is arranged on the end cover (62) and is used for supporting the speed reducer shaft (5), a connecting flange (63) is arranged at a housing opening of the housing body (61), and a second bearing (64) is radially extended on the connecting flange (63) and is used for supporting the differential mechanism (3).

Description

Integrated electric drive rear axle assembly Technical Field The invention relates to the field of electric drive rear axles, in particular to an integrated electric drive rear axle Background Along with the continuous acceleration of new energy automobile development process, the electric drive bridge is used as a core component of a power transmission system, and the design and research and development of the electric drive bridge are increasingly harsh in requirements on cost reduction, weight reduction, efficiency improvement, high reliability and excellent NVH (noise, vibration and harshness) performance. In order to adapt to the power layout requirement of new energy automobiles, various integrated electric drive bridge design schemes have appeared in the prior art. For example, in the patent CN223116131U entitled "coaxial electric drive bridge", the motor, the gear set of the speed reducer, and the differential are integrated into an electric drive bridge package with an integral structure, so that the central axes of the motor shaft, the gear set of the speed reducer and the differential are collinear, and the coaxial electric drive bridge structure with a hollow motor shaft matched with a half shaft is adopted, so that the split design of the electric drive assembly and the electric drive bridge package reduces part of maintenance cost, and improves the bearing capacity of the electric drive bridge. However, the structure aims at the coaxial electric drive bridge, the motor and the half shaft are coaxial, so that the NVH performance of the whole vehicle is poor, and once the bridge package is carried and deformed, the bridge package can be directly transmitted to a motor shaft, so that the shafting is easy to bend, the bearing is stressed abnormally, and the service lives of a transmission system and the bearing are greatly shortened. In the patent CN223764128U, the integrated layout of multiple parts is realized through the design of a common shell of a motor, a speed reducer, a controller and a differential. Through with motor shaft and reduction gear initiative helical gear integrated into one piece cancelling spline connection, avoided spline wearing and tearing, the problem such as axle frequency, utilize gear engagement axial force to offset the partial axial force of motor rotor simultaneously, promoted bearing life to a certain extent and optimized NVH performance. However, the electric drive bridge is of a cannula type structure, the weight is large, the quality of the whole shell cannot be reduced, the bearing capacity is weak, and the efficiency is poor. Disclosure of Invention The invention aims at the problems, and provides an integrated electric drive rear axle assembly, which reduces the wheelbase of a motor shaft and a half axle by arranging a motor part in a bridge bag, and simultaneously separates a transmission system from a bearing bridge bag by arranging a mounting base to mount a motor and a reduction gear, thereby greatly reducing the fault risk. The integrated electric drive rear axle assembly comprises a bridge package, a motor, a differential mechanism, a rear cover, a mounting seat for mounting the motor and the differential mechanism, wherein the mounting seat is fixedly connected with the rear cover, the mounting seat comprises a flange mounting seat, a motor assembly cavity is formed in the flange mounting seat, a support frame axially extends along one side of the motor assembly cavity and is used for supporting the motor, a first bearing seat is arranged on the flange mounting seat and is used for supporting the differential mechanism, two shaft holes are formed in the motor assembly cavity, one end of the motor assembly cavity is located in the motor assembly cavity, a motor shaft penetrates through the first shaft hole, an output gear is fixedly arranged on the motor shaft, one end of a reducer shaft is supported in the second shaft hole, the other end of the reducer shaft is supported on the rear cover, a driven gear and a driving gear are fixedly arranged on the reducer shaft, the output gear is meshed with the driven gear, the driving gear is meshed with a main reduction gear of the differential mechanism, the rear cover is buckled and fixed with the bridge package, a part of the motor and the differential mechanism are located in the bridge package, and the distance between the motor shaft and the differential mechanism and a half axle is 3 mm-6 mm. Preferably, the motor shaft is arranged side by side with the reducer shaft. Preferably, a motor controller is also included, the motor controller being disposed within the bridge bag. Preferably, the motor is cooled using an oil cooling system. Preferably, the oil cooling system comprises an oil pump, an oil duct, a filter and a heat exchanger. Preferably, the end of the support frame is provided with a connecting block, the connecting block is provided with a bolt hole, and the mounting seat is fixed with the rear