Variable Height Barbs for Brake Backing Plate Retention
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Solution Overview
Problem
Existing brake backing plates with uniformly sized barbs fail to provide consistent retention of friction material, leading to poor attachment and exposure of barbs during shear forces, resulting in weak friction retention.
Innovation Solution
A differentially textured workpiece with multiple rows of integral raised barbs, where a first group of barbs is at least 10% higher than a second group, and the height variation forms a regular pattern, achieved by texturing and reshaping the barbs using toothed blades and rollers to create varying heights and bendings, enhancing friction material retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uniformly sized barbs are used on brake backing plates, then the manufacturing process is simple, but the friction material retention is poor and barbs become exposed during shear forces
Solution Approach 1:
The patent applies local quality by creating two distinct groups of barbs with different heights on the brake backing plate. The first group has barbs of a first height while the second group has barbs of a second height, allowing different regions of the plate to provide different retention characteristics. This resolves the contradiction by improving friction material retention through localized variation in barb geometry without requiring complete redesign of the entire barb structure.
Solution Approach 2:
The patent segments the barb structure into multiple groups with different heights. By dividing the barbs into a first group and a second group with distinct height characteristics, the patent creates a multi-level retention system that prevents uniform failure modes. This segmentation approach improves reliability by ensuring that friction material is retained more effectively during shear forces, as different barb heights create varied engagement points.
2Manufacturing precision
If all barbs are made to the same height, then the manufacturing process is straightforward, but friction material attachment becomes uneven and barbs are exposed during operation
Solution Approach 1:
The patent deliberately introduces local quality variations by creating specific regions with different barb heights. The first group of barbs has a first height while the second group has a second height, which may be greater than, less than, or equal to the first height. This controlled variation improves friction material retention by creating diverse engagement characteristics across the plate surface, resolving the contradiction between manufacturing precision and reliability.
3Reliability
If variable height barbs are implemented, then friction material retention is enhanced, but the manufacturing process becomes more complex
Solution Approach 1:
The patent applies preliminary action by forming both groups of barbs during the initial texturing process rather than requiring separate operations. The toothed blade or rolling element is configured to create the variable height pattern in a single pass, establishing the differential barb structure before final friction material application. This approach improves friction material retention while minimizing the increase in manufacturing complexity.
Solution Approach 2:
The patent implements parameter changes by varying the barb height parameter across different regions of the brake backing plate. By controlling the geometry of the toothed blade or rolling element, the patent creates a systematic variation in barb height that enhances friction material retention. This parameter variation is achieved through controlled modification of the texturing process parameters rather than requiring fundamentally different manufacturing methods.
Data Source
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AI summary
A workpiece (1) includes a material with a face and a first plurality of barbs and a second plurality of barbs extending integrally from the face. Each barb has a height above the face. The barbs (3) of the first plurality are at least 10% higher than the barbs (3a) of the second plurality. The first plurality of barbs (3) includes at least 10% of the barbs on the face and the second plurality of the barbs (3a) includes at least 10% of the barbs on the face. The barbs (3a) of the second plurality of barbs are bent and pointed.