Motor and speed reducer integrated case and casting and welding method thereof

Abstract

The invention discloses a motor and speed reducer integrated case and a casting and welding method thereof. The case comprises an outer case body and an inner case body, wherein the outer case body comprises a motor case body and a speed reducer case body which are integrally formed through high-pressure casting; the inner case body is nested in the motor case body, a spiral water channel rib is arranged on the outer surface of the inner case body, and spaces of the spiral water channel rib form a spiral water channel by being matched with an outer wall of the inner case body and the inner wall of the motor case body. According to the motor and speed reducer integrated case, the integration degree is increased, end covers are reduced, the cost is reduced, the axial space is compressed, andthe NVH characteristic of a system is improved. According to the casting and welding method, the complexity of a manufacturing process is reduced through high-pressure casting, the batch efficiency is high, the wall thickness of the case is reduced, structures of process holes are omitted, and the radial space is compressed.

Description

Technical field [0001] The invention relates to a new energy automobile motor, in particular to an integrated housing of a motor and a reducer and a casting and welding method thereof. Background technique [0002] In the critical turning period of the rapid development of new energy vehicles, how to improve efficiency and reduce costs for motors has become an important proposition. Under the general trend of miniaturization, integration, and cost reduction of the motor system, the integrated electric drive assembly system of "motor + electronic control + reducer" will become an inevitable trend, and the motor is the core component of new energy vehicles. Its technology and production level directly affect the performance and cost of the vehicle. [0003] The existing water-cooled motor housings for new energy vehicles mainly have two manufacturing methods. One is low-pressure casting to form one-time molding, and the water channel characteristics are completed by sand cores. The...

AI Technical Summary

Problems solved by technology

[0005] 1. At present, the water-cooled motor housing and the reducer housing of new energy vehicles are separated and connected through the end cover, which increases the axial length of the whole machine, which is not conducive to the layout of the whole vehicle;

[0006] 2. The motor housing and the reducer housing are die-cast separately, and most of them choose low-pressure casting, relying on sand cores to complete the waterway characteristics. If the reducer housing and the motor housing are integrated, the low-pressure casting will greatly increase. The complexity of the process, the pass rate is low and the cycle is long;

[0007] 3. Separate welded water channel, there is a gap between the inner and outer shells, it is easy to generate noise after vibration, and the NVH performance is poor

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