Motor-Driven Compressor Housing Layout for Mounting Stress Isolation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing motor-driven compressors for vehicle air conditioners are prone to deformation and misalignment of the compression mechanism and electric motor due to uneven clamping forces and poor dimensional accuracy of mounting lugs, leading to noise and reduced durability of the rotary shaft bearings.
Innovation Solution
The compressor design features a first housing with radially opposite mounting lugs and a separate second housing with a third mounting lug, distributing stress and preventing deformation, while maintaining alignment of the electric motor and compression mechanism, and reducing vibration transmission to the vehicle engine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If mounting lugs are formed integrally with the main housing at positions outside the compression mechanism and electric motor, then the motor-driven compressor can be mounted on the vehicle engine, but the main housing may be deformed due to differences of clamping forces and poor dimensional accuracy, causing misalignment of the compression mechanism and electric motor
Solution Approach 1:
The housing is divided into a main housing and a sub-housing, with mounting lugs formed integrally with the sub-housing rather than the main housing. This segmentation isolates the mounting lugs from the precision-critical main housing, allowing the mounting lugs to be formed separately and then joined to the main housing, thereby preventing deformation and misalignment of the compression mechanism and electric motor.
2Reliability
If mounting lugs are fastened to bosses by bolts, then the motor-driven compressor can be securely mounted, but the main housing may be deformed due to uneven clamping forces
Solution Approach 1:
The housing is segmented into main housing and sub-housing, with mounting lugs formed on the sub-housing. This allows the mounting forces to be applied to the sub-housing rather than the main housing, isolating the precision-critical main housing from deformation caused by uneven clamping forces during mounting.
3Strength
If the compression mechanism and electric motor are fixed to the main housing, then they are securely positioned, but they may be displaced out of alignment when the main housing deforms
Solution Approach 1:
By dividing the housing into main housing and sub-housing, with mounting lugs on the sub-housing, the invention prevents deformation of the main housing that would cause misalignment of the compression mechanism and electric motor. The sub-housing absorbs the mounting stresses, preserving the alignment precision of components fixed to the main housing.
Data Source
AI summary
A motor-driven compressor has a compression mechanism, a rotary shaft, an electric motor, a motor drive circuit and a housing assembly. The compression mechanism, the electric motor and the motor drive circuit are disposed along the axial direction of the rotary shaft in the housing assembly. The housing assembly has first and second housings. The first housing mounts the electric motor and the compression mechanism. The first housing has first and second mounting lugs formed integrally with the peripheral surface of the first housing. The second housing is joined to the first housing for accommodating the motor drive circuit. The second housing has a third mounting lug formed integrally with the second housing. The first through third mounting lugs are fastened to a mounting object to which the motor-driven compressor is to be mounted by means of fastening members.