Disc Brake Pad Shim Plate Curvature and Locking Mechanism
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Solution Overview
Problem
Conventional disc brake pad assemblies experience instability and noise due to the offset of frictional and torque-bearing portions, leading to uneven pad behavior and increased wear, and existing solutions like shim plates with locking pieces face challenges in smooth circumferential displacement and high production costs.
Innovation Solution
The disc brake pad assembly features locking pieces with bent-to-rise portions and projecting surfaces on the shim plates that allow direct abutment with the pressure plate's circumferential edges without frictional contact, enabling smooth circumferential displacement and reducing production costs by increasing the radius of curvature of corner portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If locking pieces are brought into direct abutment with circumferential edge portions of the pressure plate, then the shim plate can be displaced smoothly in the circumferential direction, but the locking pieces may bite into the edge portions causing instability and noise
Solution Approach 1:
The invention applies curvature by forming rounded corner portions at the ends of the circumferential edge portions of the pressure plate. These rounded corners have a radius of curvature that prevents the locking pieces from biting into sharp edges during circumferential displacement, thereby maintaining both smooth movement and stable orientation of the shim plate.
2Reliability
If a double-plate configuration with fittingly superposed inner and outer shim plates is adopted, then the effect of suppressing brake squeal and partial wear is improved, but the device complexity and production cost increase
Solution Approach 1:
The invention merges the functions of multiple shim plates into a single integrated shim plate structure. By incorporating both noise suppression functionality and stable locking mechanism with rounded corners into one plate, the design achieves effective brake noise and wear suppression while simplifying the overall structure and reducing production costs.
3Ease of operation
If the radius of curvature of corner portions of the pressure plate is increased, then the locking pieces can displace smoothly without biting, but the manufacturing precision requirements may be affected
Solution Approach 1:
The invention optimizes the radius of curvature parameter of the corner portions to achieve a balance between smooth displacement and manufacturing precision. By selecting an appropriate radius value that is large enough to prevent biting but not excessively large, the design facilitates smooth locking piece movement while remaining compatible with standard manufacturing capabilities.
Data Source
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AI summary
Projecting portions are formed at portions on circumferential edge portions of a pressure plate 2a which are brought into abutment with locking pieces 20, 21, and circumferential end edge portions of the locking pieces 20, 21 are caused to float from the circumferential edge portions of the pressure plate 2a. Thus, circumferential end edges of the locking pieces 20, 21 which constitute sharp ends are prevented from being brought into strong frictional contact with the circumferential edge portions of the pressure plate 2a.