Raceway Bushing Annular Collar Perpendicularity
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Solution Overview
Problem
Automatic transmission systems face challenges in achieving high precision and compactness in raceway bushings, leading to issues with sealing and component integration, particularly due to the need for precise perpendicularity and rigidity to prevent leakage and ensure proper function.
Innovation Solution
A raceway bushing design featuring a cylindrical peripheral wall, a bottom wall with an annular collar that rises axially, and a bottom opening, which allows for close shape tolerances and enhanced rigidity, eliminating the need for extensive mechanical machining and ensuring perpendicularity, thereby creating a reliable sealing and stop surface system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If mechanical machining is used to achieve precise perpendicularity, then manufacturing precision is improved, but device complexity and production cost increase
Solution Approach 1:
The annular collar is formed during the drawing process itself, before final assembly, to pre-establish the precise perpendicular geometry required for the sealing surface. This preliminary formation of the collar structure eliminates the need for subsequent machining operations to achieve the required perpendicularity.
Solution Approach 2:
The drawing process automatically generates the precise perpendicular geometry through the inherent constraints of the forming tooling, allowing the component to self-establish its critical dimensions without external machining intervention. The collar structure serves its own geometric definition function.
2Weight of moving object
If the bottom wall is made thin to reduce material, then weight is reduced, but rigidity and shape stability deteriorate
Solution Approach 1:
The bottom wall structure is segmented into a flat bottom surface and a separate annular collar component formed during drawing. This segmentation allows the collar to provide structural rigidity and perpendicularity while the bottom wall itself can remain thin, optimizing both weight and structural requirements.
Solution Approach 2:
The annular collar adds vertical dimension (height) to the bottom wall structure, providing rigidity and perpendicular reference surfaces without increasing the horizontal footprint or overall weight significantly. The collar rises axially beyond the bottom surface to create the necessary structural support.
3Stability of the object's composition
If the annular collar is formed with large radius, then rigidity is improved, but manufacturing complexity increases
Solution Approach 1:
The formation of the annular collar is merged with the existing drawing process of the bushing body, utilizing the same forming tooling and material flow paths. This integration allows the collar to be formed simultaneously with the main component without requiring separate manufacturing steps or complex additional tooling.
Data Source
AI summary
A raceway bushing which has a substantially cylindrical peripheral wall that forms a bushing inner surface and a bushing outer surface, a bottom wall which extends from the peripheral wall and has an inner bottom surface and an outer bottom surface, and a bottom opening configured in the bottom wall. The bottom opening is bordered by an annular collar that rises axially beyond the inner bottom surface.