Synthetic Resin Timing Guide Shoe With L-Shaped Protrusions
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Solution Overview
Problem
Existing sliding contact guides for transmission media in internal combustion engines face issues with secure attachment during assembly and disengagement due to temperature changes and vibrations, leading to instability and potential detachment of the shoe from the support arm.
Innovation Solution
A sliding contact guide design featuring an elongated supporting arm with zig-zag configured notches and protrusions on the shoe, ensuring secure attachment and resistance to longitudinal and lateral movement, with L-shaped protrusions on both edges and a bag-like receptacle for enhanced stability and easy assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If L-shaped protrusions are provided on only one long edge of the shoe, then the shoe can be connected to the supporting arm, but the shoe is liable to disengage from the arm during operation due to thermal expansion and vibrations
Solution Approach 1:
The connection system is segmented into multiple attachment points: L-shaped protrusions on both long edges of the shoe engage with corresponding notches on the supporting arm, while strip-shaped protrusions on the short edges provide additional securing. This segmentation distributes the connection load and prevents disengagement during thermal expansion and vibrations.
Solution Approach 2:
The shoe features asymmetric protrusion configuration: L-shaped protrusions are positioned on both long edges at specific longitudinal locations, while strip-shaped protrusions are placed on the short edges. This asymmetric arrangement optimizes both assembly ease and operational reliability by creating stable engagement points that resist disengagement forces.
2Reliability
If L-shaped elements are formed along both long edges of the shoe for attachment, then connection stability is improved, but it becomes difficult to connect the shoe with the support arm during assembly
Solution Approach 1:
The shoe is designed with protrusions that can be preliminarily positioned and engaged with the supporting arm before final securing. The L-shaped protrusions on both edges and strip-shaped protrusions on short edges can be sequentially engaged, allowing easy assembly while maintaining connection stability. The geometry of protrusions and notches facilitates preliminary engagement followed by secure locking.
3Ease of operation
If the shoe is formed of synthetic resin, then the shoe can provide smooth sliding contact, but the shoe undergoes repeated elongation and shrinkage due to temperature changes causing gap formation and potential disengagement
Solution Approach 1:
The connection system incorporates multiple protrusions and notches that anticipate and accommodate thermal expansion and contraction of the synthetic resin shoe. The L-shaped protrusions on both edges and strip-shaped protrusions on short edges create a robust connection that cushions against gap formation and disengagement during temperature-induced dimensional changes.
4Ease of manufacture
If a U-shaped hook engages the end of the arm adjacent the pivot axis, then the shoe can be attached to the arm, but the hook can become disengaged due to longitudinal movement from thermal expansion
Solution Approach 1:
The connection system merges multiple attachment methods: the U-shaped hook at the end of the shoe combines with L-shaped protrusions on both long edges and strip-shaped protrusions on short edges. This combination creates a multi-point connection system that prevents disengagement while maintaining ease of assembly, as all protrusions work together to secure the shoe to the supporting arm.
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 design provides a secure and stable connection between the shoe and support arm, preventing disengagement during operation and facilitating easy assembly and disassembly, while resisting thermal expansion and vibrations.
Implementation Method 1
Since the shoe 510 is formed of synthetic resin, it undergoes repeated elongation and shrinkage due to temperature changes, especially when used in the timing drive of an engine.
Data Source
AI summary
In a sliding contact chain guide of the kind used in the timing transmission of an internal combustion engine, a synthetic resin guide shoe is attached to a pivoting support arm by protrusions formed as unitary parts of the shoe, which engage notches formed in the support arm. L-shaped protrusions formed on one side edge of the shoe engage both the back face and one side edge of the arm, and strip shaped protrusions on the opposite side edge of the shoe engage the opposite side edge of the arm. An L-shaped protrusion is formed adjacent one end of the shoe on the edge having the strip-shaped protrusions.