Chain Guide Elastomer Overmoulding for Dual-Resin Bonding
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Solution Overview
Problem
The challenge lies in effectively integrating thermoplastic and thermoset materials in chain control devices, such as tensioner arms and snubbers, due to significant differences in moulding parameters and tool temperatures required for each material type.
Innovation Solution
The method employs two-shot injection moulding to form a tensioner arm bracket, chain guide, or snubber, where a first shot of thermoplastic polymer or thermosetting resin forms the body, and a second shot of thermoset elastomer overmoulds the chain sliding face, creating a molecular bond between the two materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thermoplastic polymer or thermosetting resin is used for the body and thermoset elastomer for the chain sliding face, then the structural integrity and performance are enhanced, but the manufacturing complexity increases due to significantly different moulding parameters and tool temperatures required for each material type
Solution Approach 1:
The patent combines two different resin types (thermoplastic polymer or thermosetting resin for the body, thermoset elastomer for the chain sliding face) into a single integrated component using two-shot injection molding. This merging approach allows both materials to be manufactured together in one process, creating a molecular bond between layers that enhances structural integrity while avoiding the need for separate manufacturing and assembly steps that would increase complexity
Solution Approach 2:
The patent uses composite materials by combining thermoplastic polymer or thermosetting resin with thermoset elastomer in a layered structure. The first shot forms the body from the base resin, and the second shot overmolds the chain sliding face with the elastomer. This composite approach allows each material to contribute its specific properties (strength from the body material, elasticity and chain interaction from the elastomer) while being manufactured as an integrated component
2Reliability
If thermoset elastomer is overmolded onto thermoplastic polymer or thermosetting resin body, then the chain sliding face gains elastic properties and durability, but the process time increases due to the sequential two-shot molding requirement
Solution Approach 1:
The patent applies preliminary action by first forming the body from thermoplastic polymer or thermosetting resin, then immediately overmolding the thermoset elastomer chain sliding face in a sequential two-shot process. The first shot creates the base structure with mounting features, and the second shot adds the elastomer layer while the first material is still in a suitable state for bonding. This preliminary formation of the body structure enables the subsequent elastomer application to proceed efficiently without requiring separate manufacturing steps
Solution Approach 2:
The two-shot injection molding process maintains continuity of useful action by transitioning seamlessly from forming the body to overmolding the chain sliding face. The mold remains closed and the processing continues without interruption, with the second shot of elastomer being injected and cured while the first shot material is still in position. This continuous process eliminates the need for removing, handling, and repositioning components between manufacturing steps, reducing overall process time despite the dual-material requirement
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
This approach allows for the efficient integration of thermoplastic and thermoset materials, enhancing the structural integrity and performance of chain control devices by forming a robust molecular bond between the body and the chain sliding face.
Implementation Method 1
The thermoset elastomer and the thermoplastic polymer or thermosetting resin form a molecular bond which connects the chain sliding face to the body
Data Source
AI summary
A method of forming a tensioner arm bracket, chain guide, snubber or tensioner arm with two shot injection molding. The tensioner arm bracket, chain guide, snubber or tensioner arm each having a body and a chain sliding face. The body of the tensioner arm bracket, chain guide, snubber or tensioner arm bracket is formed of by a first shot of thermoplastic polymer or thermosetting resin and the chain sliding face is formed by a second shot of thermoset elastomer which is overmoulded onto the body. The body of the component is made of either a thermoplastic or thermosetting resin is fixed to its chain sliding face either by one or more of an anchor point generated by undercuts in the body and/or chemical bonds between the dissimilar materials.