Tensioner Lever Restricting Protrusion Spring Retention
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Solution Overview
Problem
Conventional tensioner levers experience displacement or detachment of the torsion coil spring during transport or attachment, leading to interference with the attachment surface and potential damage, due to the loose fitting of the helical part on the boss's outer surface.
Innovation Solution
A tensioner lever design featuring a lever body with a cylindrical boss having a restricting protrusion on its outer surface, positioned closer to the attachment surface than the helical part of the torsion coil spring, which prevents movement towards the attachment surface, ensuring the spring remains securely attached and avoids interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the helical part of the torsion coil spring is loosely fitted on the outer circumferential surface of the boss, then the attachment operation can be performed, but the helical part may displace from the predetermined mounting position or fall off during transport or delivery
Solution Approach 1:
A restricting protrusion is added to the outer circumferential surface of the boss to act as a physical barrier that prevents the helical part from displacing or falling off during transport, while still allowing the attachment operation to proceed normally
2Ease of manufacture
If the helical part is loosely fitted on the boss, then the torsion coil spring can be installed, but the helical part may move toward the attachment surface due to vibration during chain operation and interfere with the attachment surface
Solution Approach 1:
The restricting protrusion is positioned to preemptively prevent the helical part from moving toward the attachment surface by creating a physical barrier before vibration or other forces can cause displacement that would lead to interference with the attachment surface
3Adaptability or versatility
If the helical part is loosely fitted on the boss, then the torsion coil spring can be mounted, but displacement or detachment may occur during transport or attachment, leading to potential damage to the spring or attachment surface
Solution Approach 1:
The restricting protrusion serves as an intermediary protective feature that maintains the mounting flexibility of the loose fit while preventing displacement or detachment that could lead to damage
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 reliably prevents displacement or detachment of the torsion coil spring, allowing for smooth attachment and operation of the tensioner lever, reducing the risk of damage to the spring or attachment surface.
Implementation Method 1
a torsion coil spring interposed between the lever body and an attachment surface to press the shoe surface toward the chain
Data Source
AI summary
An object of the present invention is to provide a tensioner lever that can reliably prevent displacement or detachment of a torsion coil spring, prevent the torsion coil spring from interfering with an attachment surface, and allow smooth attachment of the tensioner lever to the attachment surface. The tensioner lever includes a lever body having a shoe surface, and a torsion coil spring pressing the shoe surface toward a chain. The lever body includes a base part and a cylindrical boss. The torsion coil spring includes a helical part loosely fitted on an outer circumferential surface of the boss, a pressing arm making contact with the lever body, and a support arm supported on the attachment surface. The outer circumferential surface of the boss includes a restricting protrusion formed at a position closer to the attachment surface than the helical part.