Fuel Pump Stator Housing Elastic Deformation Alignment
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Solution Overview
Problem
Existing fuel pump manufacturing methods face challenges in accurately aligning the center axis of the housing relative to the center axis of the stator due to deformation of ribs caused by burr and/or plucking during the press-fitting process, leading to reduced alignment accuracy and increased noise.
Innovation Solution
A manufacturing method that involves elastically deforming the housing by applying forces from the outside to allow the stator's ribs to contact with radially outwardly deformed portions of the housing, ensuring precise alignment without requiring a large press-fitting length or excessive force, thereby reducing deformation and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the stator is press-fitted into the housing with multiple ribs making contact to the inner wall of the housing in uniform, then the stator is fixed in position, but the ribs may deform due to burr and/or plucking leading to low alignment accuracy
Solution Approach 1:
The housing is pre-deformed by applying external force to create an elastic deformation state before the stator is inserted. This preliminary action prepares the housing to accommodate the stator's ribs without causing burr or plucking during the press-fitting process, thereby preventing rib deformation and ensuring high alignment accuracy.
Solution Approach 2:
The physical state of the housing is changed by applying external force to create elastic deformation. This parameter change allows the housing to expand radially outward at specific portions, enabling the ribs to make contact without deformation during insertion, and resolves the contradiction between fixing the stator position and preventing rib damage.
2Manufacturing precision
If a large press-fitting length is used to improve alignment accuracy, then the alignment between stator center axis and housing center axis improves, but the manufacturing time increases
Solution Approach 1:
By pre-deforming the housing to create elastic deformation, the alignment accuracy is achieved without requiring a long press-fitting length. This preliminary preparation allows for quick insertion and affixation, significantly reducing the manufacturing time while maintaining high alignment precision between the stator and housing center axes.
3Reliability
If excessive press-fitting force is applied to ensure stator positioning, then the stator is firmly fixed, but the ribs deform due to burr and plucking causing noise and oscillation
Solution Approach 1:
The housing is pre-deformed to an elastic state before insertion, creating a compliant environment that accommodates the ribs without requiring excessive force. This prevents rib deformation and the resulting noise/oscillation, while still ensuring firm stator positioning through the elastic recovery of the housing after insertion.
Solution Approach 2:
By changing the physical state of the housing through elastic deformation, the press-fitting process can be performed with reduced force. The housing's elastic properties allow it to conform to the ribs during insertion, preventing damage and noise, while maintaining reliable stator positioning through the restored elastic state after affixation.
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
This method enables high-accuracy alignment of the stator's center axis with the housing's center axis, reducing noise and oscillation, and minimizing the need for a long press-fitting length, thus shortening manufacturing time and avoiding excessive deformation.
Implementation Method 1
applying force from a radially outside to a plurality of first portions of a sidewall of the housing to elastically deform the housing in a deformation process
Implementation Method 2
releasing application of the force to cause the ribs to make contact with the inner wall of the housing, in an affixation process subsequent to the insertion process
Data Source
AI summary
A stator has ribs, which are configured to make contact with an inner wall of a housing when accommodated in the housing. In a deformation process, force is applied from a radially outside to first portions of the housing to elastically deform the housing. In an insertion process subsequent to the deformation process, the stator is inserted into the housing, such that the ribs are enabled to make contact with second portions of the housing, which are elastically deformed radially outward. In an affixation process subsequent to the insertion process, application of the force is released to cause the ribs to make contact with an inner wall of the housing.