Timing Chain Guide Retention Structure for Thermal Shrinkage Stability
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Solution Overview
Problem
The existing chain guides in timing systems experience loosening due to thermal shrinkage differences between metal mounting bolts and synthetic resin chain guide bodies, leading to instability and inefficiencies in assembly and transportation.
Innovation Solution
A chain guide with a compression limiter and holding mechanism, featuring a tapered part, annular groove, and surface irregularity structure, which alleviates thermal shrinkage differences and prevents the compression limiter from falling off during assembly and transportation, ensuring stable chain running and improved durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal bushing is inserted into the fixing through hole to reduce thermal shrinkage difference, then the durability and stability of the chain guide mounting is improved, but the complexity of assembly operation increases and work efficiency decreases
Solution Approach 1:
The patent integrates the compression limiter holding mechanism directly into the chain guide body structure. The holding mechanism includes a holding protrusion that extends from the chain guide body into the fixing through hole, and a holding groove that receives the compression limiter. This merging of components eliminates the need for separate assembly steps for installing the compression limiter, while still providing the thermal shrinkage compensation function.
Solution Approach 2:
The compression limiter holding mechanism is designed to automatically retain the compression limiter through the interaction between the holding protrusion and holding groove. The spring-loaded compression limiter is self-retained by the structural features of the chain guide body itself, without requiring additional fastening operations or external tools during assembly.
2Reliability
If a metal bushing is inserted into the fixing through hole to reduce thermal shrinkage difference, then the durability of the chain guide is improved, but the risk of the bushing falling off during transportation increases
Solution Approach 1:
The compression limiter is nested within the fixing through hole of the chain guide body, where it is retained by the holding mechanism. The holding protrusion extends into the fixing through hole and works with the holding groove to create a nested configuration that prevents the compression limiter from falling out during transportation while allowing it to perform its thermal compensation function.
Solution Approach 2:
The holding mechanism acts as an intermediary structure between the compression limiter and the external environment. It provides a secure retention interface that prevents the compression limiter from detaching during handling and transportation, while still allowing the compression limiter to function properly during operation.
3Reliability
If a metal bushing is inserted into the fixing through hole to reduce thermal shrinkage difference, then the durability of the chain guide is improved, but the device complexity increases
Solution Approach 1:
The patent combines the compression limiter holding mechanism with the chain guide body structure. The holding protrusion and holding groove are integrated features of the chain guide body itself, rather than separate components. This merging reduces the overall number of parts and simplifies the device structure while maintaining the thermal shrinkage compensation functionality.
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 durability and transportability of chain guides, simplifies assembly, and reduces wear and breakage risks by maintaining proper tension and lubrication, thereby ensuring stable chain operation and extended service life.
Implementation Method 1
a compression limiter holding mechanism provided either to the compression limiter or to a hole rim part including the fixing through hole of the chain guide body in order to hold the compression limiter
Implementation Method 2
the compression limiter interposed between the chain guide body and the mounting bolt basically alleviates the thermal shrinkage difference between the mounting bolt and the chain guide body
Implementation Method 3
a guide shoe that slidably guides a chain
Data Source
AI summary
To provide a chain guide that can improve transportability and assembly operation efficiency, while also ensuring stable running of a timing chain and enhancing durability, with a simple structure. The chain guide has a guide shoe that slidably guides a chain, and a chain guide body that supports the guide shoe. A compression limiter having an attachment hole through which a mounting bolt for attaching the chain guide to an attachment target member passes is fitted in a fixing through hole extending through the chain guide body in a width direction thereof. A compression limiter holding mechanism is provided either to the compression limiter or to a hole rim part including the fixing through hole of the chain guide body in order to hold the compression limiter.