Synchronizer Ring Friction Layer Pyrolysis
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Solution Overview
Problem
The existing methods for producing synchronizer rings are complex and require a large number of production steps, making them inefficient and costly, while also failing to achieve optimal friction properties.
Innovation Solution
A method where only the outer layer of the friction ring is pyrolysed, retaining the original composite structure of the inner layer for improved bonding and friction properties, with the pyrolysis step being performed after adhesive bonding to the ring body, using a carbon fiber fabric and phenolic resin, and conducted under controlled conditions to enhance wear resistance and friction performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire friction ring is pyrolysed multiple times with resin impregnation, then the friction properties are improved, but the production process becomes complex and requires many steps
Solution Approach 1:
The friction ring is divided into two functional zones: an outer pyrolysed layer (thickness D2 of 20-500 μm) providing friction properties, and an inner non-pyrolysed layer (thickness D3) providing bonding and structural support. This segmentation allows selective treatment of only the outer surface, reducing production complexity while maintaining friction performance.
Solution Approach 2:
Different regions of the friction ring are given different properties: the outer layer is pyrolysed to achieve excellent friction characteristics, while the inner layer retains its original composite structure to ensure firm bonding to the ring body. This local differentiation resolves the contradiction by applying treatment only where needed.
2Reliability
If multiple pyrolysis and impregnation steps are performed, then the friction ring achieves good friction properties, but the production time and cost increase
Solution Approach 1:
The harmful complexity of multiple pyrolysis and impregnation steps is extracted and eliminated. Only a single pyrolysis step is applied to the outer layer, while the inner layer is left untreated. This extraction of unnecessary steps significantly improves productivity while maintaining the essential friction properties through the pyrolysed outer surface.
3Reliability
If the friction ring is heavily pyrolysed to improve friction properties, then wear resistance increases, but the bonding strength to the ring body may be compromised
Solution Approach 1:
The friction ring is segmented into a pyrolysed outer layer for wear resistance and an non-pyrolysed inner layer for bonding strength. The outer layer thickness D2 is controlled at 20-500 μm to provide sufficient friction performance, while the inner layer thickness D3 is maintained to ensure firm bonding to the ring body, thus resolving the contradiction between wear resistance and bonding strength.
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 method results in a synchronizer ring with improved friction properties, reduced wear, and a simpler, cost-effective production process, maintaining a firm bond between the friction ring and the ring body while minimizing production steps.
Implementation Method 1
exclusively an outer layer of a friction ring which is remote from a connecting surface is pyrolysed
Data Source
AI summary
A method for producing a synchronizer ring includes providing a ring body made of metal and having a conical connecting surface, providing a friction ring, corresponding to the connecting surface, made of a composite material of carbon fiber bound with a resin, adhesively bonding the friction ring to the connecting surface, and pyrolyzing exclusively an outer layer of the friction ring which is remote from the connecting surface.