Helical Fibrous Preform With Local Ceramic Friction Zones
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing friction parts face a challenge in achieving a balance between hot and cold braking performance, with ceramic particles improving cold braking but potentially degrading hot braking performance when uniformly distributed.
Innovation Solution
A fibrous preform with a woven and needled helical texture, where ceramic particles are selectively present only at the friction faces and absent in the intermediate portion, enhancing cold braking while maintaining hot braking performance and facilitating machining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ceramic particles are present throughout the fibrous preform to improve cold braking, then cold braking is improved, but machining difficulty increases
Solution Approach 1:
Ceramic particles are locally concentrated in the friction zones where they are needed for performance, while being absent from the intermediate zones where they would hinder machining. This localized distribution resolves the contradiction by providing ceramic benefits only where required.
Solution Approach 2:
The patent extracts ceramic particles from the intermediate zones, removing them from areas where they serve no functional purpose and would only complicate machining operations. This selective removal maintains cold braking performance in friction zones while eliminating machining difficulties in intermediate zones.
2Reliability
If ceramic particles are continuously distributed in all fibrous layers to maximize cold braking effect, then cold braking performance is maximized, but material reinforcement and hot braking properties are reduced
Solution Approach 1:
The patent implements local quality by restricting ceramic particles to friction zones where they enhance cold braking, while leaving intermediate zones free of particles to provide structural reinforcement. This spatial differentiation allows the intermediate zones to fulfill their reinforcing function without ceramic interference.
Solution Approach 2:
The fibrous preform is segmented into friction layers with ceramic particles and intermediate layers without ceramic particles. This segmentation enables the intermediate layers to provide pure structural reinforcement while the friction layers provide cold braking enhancement, resolving the contradiction between reinforcement and cold braking performance.
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The present invention relates to a fibrous preform (1) for forming the fibrous reinforcement of a friction part made of composite material, comprising a woven helical fibrous texture defining a superposition of fibrous layers (111; 121; 131), said texture being needled and having ceramic particles selectively at areas intended to define the rubbing faces of the friction part.