Integrally Molded Transmission Guide Shoe and Base
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Solution Overview
Problem
Conventional transmission guides for automobile engines face issues with stress concentration and breakage due to hook-and-notch engagement, and bond failure between synthetic resin shoe and base, leading to unreliable chain guidance and wear.
Innovation Solution
An integrally molded synthetic resin shoe and base with parallel projecting strips and concave grooves provide increased bonding area and resistance to shearing forces, ensuring stable chain travel and durability by fusing the shoe to the base, and incorporating widening grooves and strips to resist advancing forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If hooks and notches are used to engage the shoe and base, then assembly is possible, but stress concentration occurs leading to hook breakage and separation
Solution Approach 1:
The engagement interface is segmented into multiple parallel strips and grooves instead of single hooks and notches. This distributes the stress across multiple contact points, preventing stress concentration and hook breakage while maintaining assembly capability.
Solution Approach 2:
The problematic hook elements are completely removed from the design. Instead of using discrete hooks that concentrate stress, the invention uses continuous strip-groove engagement surfaces that eliminate the hook structure entirely while achieving secure connection.
2Strength
If a synthetic resin shoe is fused to a synthetic resin base, then bonding is achieved, but shearing force causes separation over time
Solution Approach 1:
The bonding interface is extended from a simple planar surface to a three-dimensional structure with multiple parallel strips and grooves. This increases the effective bonding area and creates mechanical interlocking that resists shearing forces in the width direction, preventing separation over time.
Solution Approach 2:
The invention uses two different synthetic resin materials - a wear-resistant resin for the shoe and a strong bonding resin for the base. This composite material approach optimizes both the bonding strength and the resistance to shearing forces, ensuring long-term durability.
3Ease of manufacture
If the shoe and base are molded separately, then manufacturing flexibility is maintained, but bonding reliability deteriorates
Solution Approach 1:
The shoe and base are merged into a single integrally molded component using two-member molding technology. This eliminates the bonding interface entirely, preventing bond failure and shearing force separation while maintaining manufacturing flexibility through the specialized molding process.
Solution Approach 2:
The invention changes the molding parameter by using two-member molding, which allows sequential molding of different resin materials in a single manufacturing process. This enables the creation of an integral structure with optimized material properties for both the shoe and base without requiring separate assembly steps.
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 solution enhances the bonding strength between the shoe and base, reduces wear, and maintains reliable chain guidance over a long time, preventing detachment and improving molding accuracy.
Implementation Method 1
The shoe and base are integrally molded by two member molding. Strips project from the supporting surface of the synthetic resin base and extend in parallel in the direction of elongation of the base. Concave grooves formed in the back surface of the synthetic resin shoe extend in parallel to the direction of elongation of the shoe, and each of the projecting strips of the base is received in, and fused to, one of the concave grooves formed in the back surface of the shoe.
Data Source
AI summary
In a transmission guide, a synthetic resin shoe and a synthetic resin base are integrally molded by two part molding. Strips projecting from a supporting surface of the base extend in parallel to the longitudinal direction of the base, and concave grooves formed in the shoe, which also extend in parallel to the longitudinal direction of the base and of the shoe, receive the strips of the base and are fused with the base.