Bidirectional Torque Limiting Clutch with Segmented Ratchet Drivers
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Solution Overview
Problem
Conventional torque limiting clutches are effective only in one direction of rotation, failing to provide torque limiting functionality in the opposite direction.
Innovation Solution
A clutch design featuring ratchet surfaces and counter surfaces on drivers and recesses, respectively, prevents re-engagement at high relative speeds, ensuring torque transmission in both directions by maintaining the drivers in a ratchet position where they are supported on the clutch sleeve, preventing further engagement and allowing sliding back to the disengaged position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional torque limiting clutch is designed with drivers and recesses for one-directional torque limiting, then the clutch can effectively limit torque in one direction of rotation, but it fails to provide torque limiting functionality in the opposite direction of rotation
Solution Approach 1:
The clutch is segmented into two independent torque limiting systems: a first torque limiting system with first drivers (12) and first recesses (14) for limiting torque in a first direction of rotation, and a second torque limiting system with second drivers (22) and second recesses (24) for limiting torque in a second direction of rotation. Each system operates independently, allowing bidirectional torque limiting without interfering with each other. This segmentation enables the clutch to provide comprehensive torque protection in both rotational directions while maintaining a manageable structural complexity through modular design.
2Reliability
If the clutch is designed to prevent re-engagement at high relative speeds using ratchet surfaces, then the clutch maintains secure disengagement and reduces wear, but the drivers require sufficient time to engage deeply in the recess at low speeds
Solution Approach 1:
Different surface geometries are applied to different functional zones of the drivers and recesses. The ratchet surfaces (19, 21) are designed with specific angular orientations to prevent re-engagement at high relative speeds by allowing the drivers to slide along these surfaces when rotating in the wrong direction. In contrast, the blocking surfaces (15, 17) are configured to enable deep engagement at low speeds when the clutch needs to connect. This local differentiation of surface properties ensures both reliable disengagement at high speeds and proper engagement at low speeds without time loss.
Data Source
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AI summary
The clutch (5) comprises a clutch hub (7), a clutch sleeve (8), which is arranged around the clutch hub in a rotatable manner, and an interior peripheral surface (9). The clutch hub and the clutch sleeve are swiveling around an axis of rotation (D). A carrier (12) is provided, which comprises two ratchet surfaces and a recess (14).