Chain Guide Shoe Hook Assembly Against Vibration Detachment
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Solution Overview
Problem
The existing chain guide designs face challenges in easy assembly, reliable attachment, and prevention of detachment due to vibration, especially when installed between cam shafts, requiring fine force adjustments and being unsuitable for machine automated assembly, with a risk of chipping and increased production costs.
Innovation Solution
A chain guide design featuring a guide shoe with a flexible extension and a shoe-side engaging part that hooks onto a base-side engaged part from below or diagonally, allowing easy engagement without bending the shoe body, and a base member with an upward attachment extension, enabling secure attachment and easy disassembly, suitable for automated assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the shoe-side engaging part is formed on the lower surface of the shoe body part to engage with the engaging hole in the base body part, then the guide shoe can be attached to the base member, but the shoe body part must be bent backward during assembly which is difficult due to strength requirements and may cause chipping or assembly failure
Solution Approach 1:
The patent inverts the engagement direction by having the shoe-side engaging part engage with the base-side engaged part from below rather than from above. This allows the guide shoe to be attached by sliding it forward without requiring backward bending of the shoe body part, eliminating the risk of chipping and assembly failure while maintaining secure attachment.
Solution Approach 2:
The patent divides the engagement function into separate components: the shoe-side engaging part on the guide shoe and the base-side engaged part on the base member. This segmentation allows independent optimization of each component, enabling the shoe body part to maintain its required thickness and strength while the engaging part provides the necessary engagement capability through a different geometric configuration.
2Ease of operation
If the shoe-side engaging part is made shorter to facilitate engagement, then assembly becomes easier, but the guide shoe can easily detach from the base member due to vibration during chain operation
Solution Approach 1:
The patent employs asymmetric geometry in the engagement interface, with the shoe-side engaging part having a specific shape that complements the base-side engaged part. This asymmetric design creates a unidirectional engagement that is easy to assemble but resistant to detachment, preventing the guide shoe from lifting off during chain operation while maintaining assembly simplicity.
Solution Approach 2:
The patent converts the potential harmful effect of vibration that could cause detachment into a beneficial locking mechanism. The engagement geometry is designed so that vibrational forces and chain tension actually enhance the engagement between the shoe-side engaging part and base-side engaged part, making detachment increasingly difficult under operational conditions.
3Reliability
If the shoe-side engaging part is firmly engaged with the base-side engaged part to prevent detachment, then attachment reliability improves, but disassembly becomes difficult when material segregation is required
Solution Approach 1:
The patent creates a dynamic engagement system where the relationship between the shoe-side engaging part and base-side engaged part can transition between tightly engaged and easily separated states. The geometric design allows automatic tight engagement during normal operation to prevent detachment, while enabling simple manual separation when disassembly is needed for material segregation or maintenance.
Data Source
AI summary
An object of the present invention is to provide a chain guide, which allows easy assembling of a guide shoe to a base member, and reliably prevents detachment of the guide shoe from the base member resulting from vibration or the like during the running of a chain. Provided is a chain guide wherein a base member includes an attachment extension extending upward from a base body part beyond a support surface, and a base-side engaged part formed in the attachment extension, a guide shoe includes a flexible extension extending from a shoe body part, and a shoe-side engaging part formed in the flexible extension, and the shoe-side engaging part is hooked to the base-side engaged part from below, or diagonally from below, or from front or back, to be positioned on the far side of the base-side engaged part during engagement therebetween.