Motor-Driven Compressor Cover with Clearance for Impact Absorption
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Solution Overview
Problem
The existing motor-driven compressors lack reliable protection for the motor drive circuit during collisions, as the cover's protective function is insufficient against significant external forces, and the stress concentration structure compromises the leg portion's strength, making secure fixation to a vehicle challenging.
Innovation Solution
A motor-driven compressor design featuring a cover fixed outside the housing with a clearance to absorb external forces, ensuring the motor drive circuit is protected by distributing the force through fastening bolts and leg portions, thereby preventing direct impact on the circuit and maintaining structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stress concentration portion is provided on the boss portion to cause rupture before the root side of the leg portion, then the motor drive circuit is protected from interference by the ruptured leg portion, but the strength of the leg portion is lowered which conflicts with reliable fixation to the vehicle
Solution Approach 1:
The housing is divided into two functional parts: the leg portion for fixation and the boss portion for stress concentration. This segmentation allows the leg portion to maintain full strength for reliable vehicle fixation while the boss portion sacrificially absorbs impact forces to protect the motor drive circuit.
Solution Approach 2:
The boss portion acts as an intermediary element between the leg portion and the motor drive circuit. It serves as a stress concentration zone that absorbs impact forces, preventing these forces from reaching the motor drive circuit while not compromising the fixation function of the leg portion.
2Reliability
If a cover is provided to protect the motor drive circuit, then protection against minor external forces is improved, but the protection is insufficient against significant external forces during collision
Solution Approach 1:
The boss portion is designed in advance as a sacrificial stress concentration zone that absorbs impact forces during collision. This beforehand cushioning mechanism protects the motor drive circuit from significant external forces that would otherwise penetrate through a simple cover.
3Stability of the object's composition
If the cover is fixed directly to the housing, then structural integrity is improved, but the cover cannot absorb external forces and the motor drive circuit remains vulnerable
Solution Approach 1:
The stress concentration function is extracted from the leg portion and concentrated in the boss portion. This allows the leg portion to maintain its full structural integrity for fixation while the boss portion independently handles stress absorption during collision.
Data Source
AI summary
It is an object of the invention to provide a motor-driven compressor being fixable reliably to a vehicle or the like and being capable of reliably protecting elements accommodated in a housing even upon reception of an external force due to a collision by any possibility.A motor-driven compressor of the invention comprises a compression mechanism for compressing fluid, an electric motor for driving the compression mechanism, a motor drive circuit for driving the electric motor, and a housing. The housing accommodates the compression mechanism, the electric motor, and the motor drive circuit. A cover for protecting the housing from an external force caused by a collision is fixed to the outside of the housing. The cover is arranged via a clearance with respect to the housing, and absorbs the external force applied to the cover by the clearance.