Reverse Input Cutoff Clutch Contact Layout for Stable Torque Cutoff
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Solution Overview
Problem
Existing reverse input cutoff clutches face challenges in achieving stable performance while reducing manufacturing costs.
Innovation Solution
A reverse input cutoff clutch design that includes a fixed part with an inner wall surface, an input shaft, an input member, an output member, and first and second engagement elements. The engagement elements are positioned to change their position and/or posture, allowing for efficient torque transmission and cutoff.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional reverse input cutoff clutch design is used, then the torque cutoff function is achieved, but the manufacturing cost is high and performance stability is insufficient
Solution Approach 1:
The clutch is divided into multiple independent contact parts (first contact part, second contact part, third contact part, fourth contact part) distributed on different engagement elements. Each contact part can independently engage with corresponding parts on the input member or output member, allowing the system to maintain torque cutoff functionality while reducing the complexity of individual components and improving manufacturing feasibility
Solution Approach 2:
The contact parts are asymmetrically positioned relative to the central axis, with the first and second contact parts located at different radial distances than the third and fourth contact parts. This asymmetric arrangement optimizes the engagement geometry for stable torque transmission while simplifying the overall component design and reducing manufacturing requirements
2Reliability
If multiple engagement elements are used to ensure stable torque transmission, then the torque cutoff reliability is improved, but the device complexity increases
Solution Approach 1:
Each engagement element serves multiple functions: it can transmit torque in the forward direction through contact parts engaging with the input member, and it can cutoff reverse torque through contact parts engaging with the output member. This multi-functionality reduces the need for separate components for each function, thereby reducing overall device complexity while maintaining reliability
Solution Approach 2:
The first and second engagement elements are positioned symmetrically to work together as a pair, with their contact parts collectively providing both torque transmission and cutoff functions. By merging the functions of multiple contact parts on the same engagement element and combining symmetric engagement elements, the design achieves stable torque transmission with reduced component count
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 design achieves stable performance and reduces manufacturing costs by effectively transmitting rotational torque and cutting off reverse torque, while minimizing the number of parts and maintaining operational reliability.
Implementation Method 1
the pair of pressing surfaces are pressed against the pressed surface so that the pair of pressing surfaces are frictionally engaged with the pressed surface
Data Source
AI summary
In a reverse input cutoff clutch (1), two contact parts (PI1 and PI2) of a first group are respectively disposed closer to a first reference line (RL1) than two of a fifth contact part (PO1), a sixth contact part (PO2), a seventh contact part (PO3), and an eighth contact part (PO4), and two contact parts (PI3 and PI4) of a second group are respectively disposed farther from the first reference line (RL1) than the other two of the fifth contact part (PO1), the sixth contact part (PO2), the seventh contact part (PO3), and the eighth contact part (PO4).