Centrifugal Clutch Damper Groove for Stable Assist Thrust
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Solution Overview
Problem
Centrifugal clutches experience interference and unstable assist thrust due to the damper being strongly pressed against the damper groove when the clutch weight displaces backward in the rotary drive direction, leading to decreased assist thrust stability.
Innovation Solution
The centrifugal clutch design includes a damper groove with a groove width that expands to the front side in the rotary drive direction when the clutch weight contacts the clutch outer, allowing smooth displacement without interference, and features curved rear and front walls with different arc positions to stabilize assist thrust.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the damper is fitted in the damper groove with the damper being sandwiched by the damper groove, then the clutch weight can be buffered during rotation, but the damper is strongly pressed against the damper groove when the clutch weight displaces backward, interfering with the pressing action against the clutch outer
Solution Approach 1:
The damper groove is divided into two distinct sections: a first groove section with a first width for when the clutch weight is separated from the clutch outer, and a second groove section with a second width (narrower than the first) for when the clutch weight contacts the clutch outer. This segmentation allows the damper to have different clearance conditions depending on the operational state, preventing interference during backward displacement while maintaining buffering capability.
Solution Approach 2:
Different sections of the damper groove are given different local properties (different widths) to suit different operational requirements. The first groove section has a larger width to allow smooth backward displacement without strong pressing, while the second groove section has a smaller width to provide appropriate resistance and stability when the clutch weight is in the contact state, ensuring reliable assist thrust generation.
2Device complexity
If the groove width for fitting the damper is constant, then the damper groove structure is simple, but the damper is strongly pressed against the damper groove when the clutch weight displaces backward, decreasing assist thrust stability
Solution Approach 1:
The damper groove is designed with varying local properties - the first groove section has a first width and the second groove section has a second width that is smaller than the first width. This local differentiation allows the groove to provide appropriate clearance in different operational zones, preventing harmful pressing while maintaining structural feasibility.
Solution Approach 2:
The damper groove width varies dynamically along the groove length to match the dynamic requirements of different operational states. The transition from a wider first section to a narrower second section creates a progressive constraint that accommodates the clutch weight's motion while preventing excessive pressing during backward displacement, thereby maintaining assist thrust stability.
3Ease of operation
If the damper groove width expands to the front side when the clutch weight contacts the clutch outer, then smooth displacement without interference is achieved, but the groove structure becomes more complex
Solution Approach 1:
The damper groove is segmented into a first groove section with greater width for smooth displacement and a second groove section with smaller width for stable contact. This segmentation naturally accommodates the clutch weight's backward displacement without interference while maintaining a manageable structural complexity through clear geometric definition.
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 ensures smooth and stable generation of assist thrust by preventing interference and maintaining consistent resistance during clutch weight displacement, even with clutch shoe abrasion, thus enhancing clutch performance.
Implementation Method 1
a damper provided on the drive plate to face the clutch weight and including an elastic body
Implementation Method 2
a centrifugal clutch configured to transmit the rotary drive force to a driven side when an engine reaches a predetermined number of rotations
Data Source
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AI summary
Provided is a centrifugal clutch configured so that a clutch weight can be smoothly displaced without interference with backward displacement of the clutch weight in a rotary drive direction of a drive plate and assist thrust can be stably generated. A centrifugal clutch 200 includes, through swing support pins 214, clutch weights 230 on a drive plate 210 to be rotatably driven by drive force of an engine, and includes plate-side cam bodies 218 and dampers 221. The clutch weight 230 turnably displaces to a clutch outer 240 side through the swing support pin 214, and includes a weight-side cam body 235 configured to climb on the plate-side cam body 218 and a damper groove 236. The damper groove 236 is formed such that a groove width W2 for fitting the damper 221 when the clutch weight 230 is at a clutch-ON position is wider to a front side in a rotary drive direction of the drive plate 210 than a groove width W1 for fitting the damper 221 when the clutch weight 230 is at a clutch-OFF position.