Reverse-Input Blocking Clutch for Output Looseness Suppression
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Solution Overview
Problem
The reverse input blocking clutch experiences looseness in the output member due to gaps between the output-side engaging portion and the output-side engaged portion, leading to positional deviations and abnormal noise, especially when connected to screw shafts or used for adjusting stages or steering angles.
Innovation Solution
Incorporating an elastic member that is elastically stretched between the output-side engaging portion and the engaging element, allowing the engaging element to move away from the pressed surface during forward torque input and towards it during reverse torque input, thereby ensuring secure engagement and minimizing looseness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the output-side engaging portion is inserted loosely between the output-side engaged portions to secure assembly workability, then the assembly process becomes easier, but looseness is generated in the output member causing positional deviations and abnormal noise
Solution Approach 1:
The elastic member is pre-installed between the output-side engaging portion and the engaging element before final assembly. This preliminary action ensures that the engaging element is pushed toward the pressed surface, maintaining tight engagement between the output-side engaging portion and output-side engaged portions, thereby preventing looseness while preserving assembly workability
Solution Approach 2:
The elastic member changes the physical state of the engagement interface by applying continuous elastic force. This parameter change ensures that even with loose dimensional tolerances for easy assembly, the actual engagement maintains minimal gap and high stability, eliminating positional deviations and abnormal noise
2Reliability
If the engaging element is positioned close to the pressed surface to minimize gaps, then output member stability is improved, but the engaging element cannot move sufficiently during torque transmission
Solution Approach 1:
The elastic member acts as a cushioning element that stores elastic energy when the engaging element moves away from the pressed surface during torque transmission. This beforehand cushioning allows the engaging element to achieve sufficient mobility for torque transmission while ensuring it returns to and maintains stable engagement with the pressed surface, resolving the contradiction between stability and mobility
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 elastic member effectively suppresses looseness in the output member, preventing positional deviations and abnormal noise, while reducing manufacturing costs and maintaining a compact design.
Implementation Method 1
an elastic member that is elastically stretched between the output-side engaging portion and the engaging element
Implementation Method 2
the elastic member is elastically deformed so as to engage the output-side engaged portion with the output-side engaging portion
Implementation Method 3
the pressing surface is pressed against the pressed surface so as to frictionally engage the pressing surface with the pressed surface
Data Source
AI summary
A reverse input blocking clutch has a pressed member having a pressed surface on the inner circumferential surface; an input member having an input-side engaging portion arranged on the inner side in the radial direction of the pressed surface and coaxially arranged with the pressed surface; an output member having an output-side engaging portion arranged further on the inner side in the radial direction than the input-side engaging portion and coaxially arranged with the pressed surface; an engaging element arranged on the inner side in the radial direction of the pressed surface so as to move in a first direction which is a far-near direction with respect to the pressed surface; and an elastic member arranged at a position overlapping the output-side engaging portion with respect to the first direction so as to be elastically stretched between the output-side engaging portion and the engaging element.