Adhesively Bonded PTFE EPDM Composite Seal for ABS Piston Wear
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current ABS system piston seals made of EPDM wear rapidly under increased demands from advanced vehicle functions, leading to potential leaks and reduced longevity.
Innovation Solution
A composite seal using adhesively bonded PTFE and EPDM materials, with PTFE providing dynamic sealing and wear resistance, and EPDM offering elasticity and pressure resistance, arranged in a radial stack with complementary convex and concave contacting surfaces for enhanced durability and resistance to axial loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-material EPDM seal is used, then the seal provides good elasticity and pressure resistance, but the seal suffers from rapid wear under intensive loading conditions
Solution Approach 1:
The seal is constructed as a composite structure with a PTFE outer layer and an EPDM inner layer. The PTFE layer provides wear resistance and protects against intensive loading, while the EPDM layer provides elasticity and pressure resistance. This composite material approach resolves the contradiction by combining materials with complementary properties to achieve both durability and extended lifespan.
Solution Approach 2:
Different regions of the seal have different material properties optimized for their specific functions. The outer PTFE layer is designed for wear resistance where it contacts moving parts, while the inner EPDM layer is designed for elasticity where it contacts the piston. This local differentiation of material quality allows the seal to simultaneously achieve wear resistance and pressure resistance without compromise.
2Reliability
If the seal is made from a single material, then the structure is simple, but the seal cannot simultaneously provide both dynamic sealing and static sealing functions
Solution Approach 1:
The seal uses a composite structure with PTFE for dynamic sealing and EPDM for static sealing. Each material is selected for its specific sealing function, with PTFE providing low-friction dynamic sealing and EPDM providing elastic static sealing. This composite approach achieves superior multi-function sealing performance while maintaining a relatively simple two-layer structure.
Solution Approach 2:
The seal is segmented into two distinct functional layers: an outer PTFE layer for dynamic sealing and an inner EPDM layer for static sealing. This segmentation allows each layer to be optimized for its specific function while working together as an integrated sealing system, achieving both dynamic and static sealing capabilities.
3Strength
If PTFE is used for dynamic sealing, then wear resistance is improved, but the material lacks the elasticity needed for pressure resistance
Solution Approach 1:
The seal combines PTFE and EPDM in a composite structure where PTFE provides the wear-resistant outer surface for dynamic sealing, while the EPDM inner layer provides the necessary elasticity for withstanding pressure peaks. This composite material solution allows the seal to simultaneously achieve high wear resistance and adequate elasticity by leveraging the strengths of each material in its appropriate functional zone.
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
The composite seal provides improved sealing performance and extended lifespan, effectively handling more intensive loading conditions and preventing fluid leakage, making it suitable for advanced ABS system applications.
Implementation Method 1
the first sealing part and the second sealing part are adhesively bonded together
Implementation Method 2
the first material comprises PTFE... providing dynamic sealing while the second part provides static sealing
Implementation Method 3
the use of EPDM for this second, static sealing part allows the seal to deform, both in order to be fitted in the ABS pump and, on account of its elasticity, to withstand pressure peaks
Data Source
Figure 1~3
AI summary
This braking device comprises a seal (1) having a first sealing part (2) made of a first material and a second sealing part (4) made of a second material different than the first material. In addition, the first material comprises PTFE, the second material comprises EPDM, and the first sealing part (2) and the second sealing part (4) are adhesively bonded together.