Automatic Clutch Retention in Pedestrian Vehicle Transmissions
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Solution Overview
Problem
Existing automatic clutches in pedestrian-controlled wheeled vehicles are sensitive and lack reliability, leading to undesired activation during reverse driving.
Innovation Solution
A transmission system with an automatic clutch mechanism that includes a part with retaining elements, which limits axial displacement away from the driven member when the clutch is deactivated and the driven member is in reverse rotation, preventing undesired activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the clutch mechanism is designed as an automatic clutch without dedicated control members, then the ease of operation is improved, but the reliability deteriorates due to undesired activation during reverse driving
Solution Approach 1:
A limiting element is introduced as an intermediary component between the driven member and the clutch mechanism. This limiting element selectively restricts axial displacement of the clutch mechanism only during reverse rotation of the driven member, while allowing normal automatic operation during forward rotation. The limiting element thus mediates between the automatic clutch's ease of operation and the reliability concern during reverse driving.
2Ease of operation
If the clutch mechanism allows free axial displacement for automatic engagement, then the ease of operation is improved, but the reliability worsens due to sensitivity to undesired activation
Solution Approach 1:
The system dynamically adjusts the axial displacement characteristics of the clutch mechanism based on the rotation direction of the driven member. During forward rotation, the clutch mechanism maintains full dynamic freedom for automatic engagement. During reverse rotation, the limiting element dynamically activates to constrain axial displacement, preventing undesired activation. This dynamic behavior resolves the contradiction between ease of operation and reliability.
3Ease of operation
If the clutch mechanism is made sensitive for automatic engagement, then the ease of operation is improved, but the reliability deteriorates due to activation during reverse driving
Solution Approach 1:
The limiting element introduces asymmetry into the clutch mechanism's axial displacement characteristics based on rotation direction. The driven member's forward and reverse rotations produce different effects on clutch mechanism displacement. During forward rotation, the clutch remains sensitive and free to engage automatically. During reverse rotation, the limiting element creates an asymmetric constraint that prevents activation. This asymmetric design resolves the contradiction by direction-dependent behavior.
Data Source
AI summary
A transmission for a wheeled vehicle has a drive member, a rotatable driven member in permanent engagement with the drive member, a wheel drive shaft and, disposed between the wheel drive shaft and the driven member, a clutch mechanism. A part of the clutch mechanism which, in the deactivated state of the clutch mechanism, is disposed in a position close to the driven member, is, in the position, limited in its axial movement in the direction of a separation from the driven member in the reverse drive state of the driven member.