Ratchet Clutch Claw Geometry for Lower Tooth Surface Pressure
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Solution Overview
Problem
The existing ratchet type clutch devices face durability issues due to increased surface pressure when the claw portion and tooth portion mesh, leading to impaired durability of these components.
Innovation Solution
The ratchet type clutch device design includes a torque transmission unit projecting opposite to the claw portion, with a tilted claw member that uses a top portion as a fulcrum, allowing the claw portion to move radially inward while the torque transmission unit moves outward, thereby increasing the contact area and reducing surface pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the claw portion and tooth portion mesh with each other with a small contact area, then the torque transmission is achieved, but the surface pressure applied to the tooth portion increases and durability is impaired
Solution Approach 1:
The claw member is designed to rotate about the shaft portion, transforming from a static component to a dynamic one. When torque is applied, the claw member rotates to allow the claw portion to move radially inward, increasing the contact area with the tooth portion and reducing surface pressure, while the torque transmission unit moves radially outward to press against the facing surface for torque transmission
Solution Approach 2:
The invention introduces radial movement dimension to the claw member. The claw portion moves radially inward to increase contact area, while the torque transmission unit moves radially outward to engage with the facing surface. This dimensional change allows simultaneous optimization of both contact area and torque transmission
2Power
If the claw member is designed with both claw portion and torque transmission unit, then torque transmission is enabled, but the structure becomes more complex
Solution Approach 1:
The invention merges the torque transmission function with the existing claw member structure. The torque transmission unit is integrated into the claw member as an extension, allowing the claw member to simultaneously perform both clutch engagement (via claw portion) and torque transmission (via torque transmission unit pressing against facing surface)
Solution Approach 2:
The claw member is designed with multi-functionality: the shaft portion provides rotational support, the claw portion engages with tooth portions for clutch action, and the torque transmission unit presses against the facing surface for torque transmission. This universal design eliminates the need for separate components
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 the durability of the claw and tooth portions by increasing the contact area and reducing surface pressure, preventing the claw member from being sandwiched and ensuring reliable torque transmission.
Implementation Method 1
the claw portion is tilted with the top portion abutting on the outer peripheral holding surface as a fulcrum
Data Source
AI summary
A ratchet type clutch device includes: an outer ring and an inner ring, in which the inner ring includes an outer peripheral surface having tooth portions, the outer ring having claw members that mesh with the tooth portions, each of the claw members includes a shaft portion, a claw portion meshing with one of the tooth portions, and a torque transmission unit projecting from the shaft portion, the shaft portion includes an outer peripheral surface including a first outer peripheral surface, the outer ring includes an outer peripheral holding surface, and a facing surface, the first outer peripheral surface is provided with a top portion, and when the claw portion meshes with the tooth portion, the claw portion is tilted with the top portion abutting on the outer peripheral holding surface, and the leading end surface of the torque transmission unit comes into contact with the facing surface.