Adjustable Self-Locking Clutch Mechanism for Variable Load Adaptation
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Solution Overview
Problem
Existing self-locking clutch mechanisms with fixed reaction points for wrap springs are unable to adjust in response to changes in clutch load, component wear, or orientation, limiting their adaptability.
Innovation Solution
An adjustable self-locking clutch mechanism featuring a wrap spring with a control member that allows the wrap spring to change its frictional engagement with the base surface by rotating the intermediate member, enabling adjustment of the frictional clamping force based on the direction of the input member's torque load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed reaction point for the wrap spring is used, then the mechanism structure is simple, but the mechanism cannot adjust in response to changes in clutch load, component wear, or orientation
Solution Approach 1:
The invention applies the dynamics principle by making the wrap spring reaction point movable rather than fixed. The control member allows the wrap spring to be positioned at different angular locations around the clutch spring, enabling the mechanism to adapt to varying clutch loads, component wear, and orientation requirements while maintaining a relatively simple overall structure.
2Reliability
If the wrap spring frictionally engages the base surface with high force, then the locking state is secure, but frictional energy losses increase
Solution Approach 1:
The invention applies the local quality principle by concentrating the frictional engagement at a specific localized point where the wrap spring contacts the base surface, rather than distributing it along a fixed arc. The control member enables positioning this high-friction contact point optimally to achieve secure locking while minimizing unnecessary frictional energy losses in other areas.
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 mechanism allows for adaptable frictional engagement, enabling efficient locking and unlocking states with minimal frictional energy losses, and maintains a locked state even when the driving torque is removed, effectively addressing the limitations of fixed reaction point mechanisms.
Implementation Method 1
a clutch spring engaged with an intermediate member and frictionally engaged with a base cylindrical surface
Implementation Method 2
a first spring engaged between the base and the output member, the first spring exerting a first spring force in a first direction, and a second spring engaged between the intermediate member and the output member, the second spring exerting a second spring force opposite the first spring force
Data Source
AI summary
A self-locking clutch mechanism comprising a base, an output member journalled to the base, a first spring engaged between the base and the output member, the first spring exerting a first spring force in a first direction, a clutch spring engaged with an intermediate member and frictionally engaged with a base cylindrical surface, an input member rotationally engaged with the base, the input member intermittently engagable with the clutch spring through a control member such that the clutch spring is temporarily released from the base cylindrical surface upon a rotary movement of the control member in a first direction, the intermediate member rotates upon release of the clutch spring from the base cylindrical surface, and a second spring engaged between the intermediate member and the output member, the second spring exerting a second spring force opposite the first spring force.