Claw Clutch Tooth Geometry for Stable One-Way Torque Transfer
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Solution Overview
Problem
Existing switchable ratchet type clutch devices face challenges in efficiently managing torque transmission between inner and outer rings, particularly in achieving stable one-way torque transmission and preventing violent oscillation of claw members, which affects durability.
Innovation Solution
The clutch device incorporates a toothed surface with asymmetrical meshing teeth and inclined third surfaces on the inner ring, along with moveable claw members and biasing members, to selectively switch between locked, one-way, and free states, stabilizing the behavior of claw members during rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ratchet type clutch devices are used to switch torque transmission states, then torque transmission can be controlled between inner and outer rings, but violent oscillation of claw members occurs affecting durability
Solution Approach 1:
The toothed surface is designed with asymmetrical teeth having different surface configurations. The first surface extends substantially radially to contact the first end portion, while the second surface extends substantially radially to contact the second end portion. The third surface between them is inclined away from the second ring, creating an asymmetrical geometry that stabilizes claw member behavior and prevents violent oscillation during operation.
Solution Approach 2:
Different surfaces of the toothed structure are given different geometric properties tailored to specific functions. The first and second surfaces are substantially radial for stable contact with claw member ends, while the third surface is inclined to control engagement characteristics. This localized differentiation of surface properties reduces oscillation and improves durability.
2Adaptability or versatility
If claw members are made moveable to enable state switching, then torque transmission states can be changed, but stability of claw member behavior during rotation deteriorates
Solution Approach 1:
The asymmetrical tooth design with specifically oriented surfaces provides stable guidance for moveable claw members during state transitions. The inclined third surface and radial first and second surfaces work together to control the engagement and disengagement of claw members, maintaining stability even as they move between locked and free states.
Solution Approach 2:
The claw members are designed to be moveable rather than fixed, allowing them to dynamically transition between different positions to achieve locked, one-way, and free states. The toothed surface geometry is specifically designed to guide this dynamic movement while maintaining stability throughout the transition process.
3Adaptability or versatility
If multiple claw members are used to achieve locked and one-way states, then torque transmission control is improved, but complexity of the device increases
Solution Approach 1:
Multiple claw members are combined with the toothed surface structure in an integrated arrangement. The first and second claw members work together with the asymmetrical tooth geometry to achieve multiple torque transmission states. This merging of components achieves versatile control while managing device complexity through efficient spatial arrangement.
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
This configuration enhances durability by reducing violent oscillation and maintaining low angular velocities, ensuring stable torque transmission and improved performance in one-way states.
Implementation Method 1
a plurality of first biasing members supported by the second ring and configured to bias the first end portion of each of the plurality of first claw members toward the first ring, and a plurality of second biasing members supported by the second ring and configured to bias the second end portion of each of the plurality of second claw members toward the first ring
Data Source
AI summary
A clutch device includes an inner ring, an outer ring and claw members to selectively lock the rings of the clutch device. A first ring among the inner and outer rings has a toothed surface that faces a second ring among the inner and outer rings. The toothed surface includes a plurality of teeth arranged in a circumferential direction to protrude toward the second ring. A given tooth includes a first surface and a second surface that extend substantially radially, and a third surface that extends between the first surface and the second surface. The tooth has a first height at a first end of the third surface adjacent to the first surface and a second height at a second end of the third surface adjacent to the second surface, in which the first height is greater than the second height.