Stator Housing Rib Layout for Lightweight Electric Compressors
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Solution Overview
Problem
The formation of numerous ribs on the stator housing to prevent deformation increases the weight of the electric compressor, which is undesirable for applications like electric vehicle air conditioners.
Innovation Solution
A stator housing with shrink-fit fixing surfaces, a gasket sealing surface, and outer surface ribs, along with a center plate and scroll compression mechanism, to enhance strength and reduce weight while preventing deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a large number of ribs are formed on the outer peripheral surface of the stator housing to increase strength, then deformation of the gasket sealing surface is suppressed, but the weight of the stator housing increases
Solution Approach 1:
Instead of uniformly distributing ribs across the entire stator housing, the invention forms ribs only at specific locations corresponding to the shrink-fit fixing surfaces where deformation occurs during stator installation. This localized reinforcement provides necessary strength exactly where needed while minimizing additional weight throughout the entire housing structure.
Solution Approach 2:
The stator housing's reinforcement structure is segmented into discrete ribs positioned at specific locations rather than using a continuous or uniform rib pattern. Each rib corresponds to a specific shrink-fit fixing surface, creating a segmented reinforcement strategy that targets problem areas without unnecessarily increasing overall weight.
2Reliability
If a large number of ribs are formed on the stator housing to prevent deformation, then sealing performance is maintained, but the cruising distance of electric vehicle air conditioner decreases
Solution Approach 1:
The invention applies reinforcement (ribs) only at specific locations on the stator housing where shrink-fit deformation occurs, rather than uniformly throughout. This ensures sealing performance is maintained at critical interfaces while minimizing unnecessary material and weight in non-critical areas of the housing.
Solution Approach 2:
Instead of providing full uniform reinforcement across the entire stator housing, the invention uses partial reinforcement only where needed for sealing. This partial action approach achieves the necessary sealing performance without the excessive weight that would result from complete uniform reinforcement.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively suppresses deformation and reduces weight, maintaining sealing performance and enhancing the structural integrity of the electric compressor.
Implementation Method 1
the stator of the motor is fixed to the inner surface of the stator housing by shrink fitting
Data Source
AI summary
An electric compressor includes a stator housing 7 in a cylindrical shape having one end opened, and a rear casing joined to an opening of the stator housing via a gasket. The stator of an electric motor is housed from the opening of the stator housing, and fixed to an inner surface of the stator housing by shrink fitting. The electric compressor includes a plurality of shrink-fit fixing surfaces 42 which is formed on the inner surface of the stator housing 7 and to which the stator is fixed, a gasket sealing surface 7B which is formed on an opening end surface of the stator housing 7 and on which the gasket is disposed, and a plurality of ribs 49 which is formed on an opening side of an outer surface of the stator housing corresponding to the shrink-fit fixing surfaces.