Motorcycle Clutch Driven Plate Slipping Prevention
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Solution Overview
Problem
In power transmitting apparatuses for motorcycles, driven clutch plates can slip off from the spline fitting portions when the power transmission is cut off, especially due to the spreading of the separated portion between the clutch and pressure member spline fitting portions, leading to inefficiencies and potential damage.
Innovation Solution
The apparatus incorporates a two-part structure with spline fitting portions on the clutch and pressure members, and additional means such as fold-back portions or spacers to prevent slipping, ensuring driven clutch plates remain secured even when the pressure member moves and the distance between spline fitting portions increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressure member is moved to cut off power transmission, then the separated portion between spline fitting portions is spread, but the driven clutch plates can slip off into the separated portion
Solution Approach 1:
A retainer member is introduced as an intermediary component between the driven clutch plates and the separated portion. The retainer member has a retainer fitting portion that engages with the clutch member and a retainer projection that extends toward the separated portion to prevent driven clutch plates from slipping into it, thus resolving the contradiction by adding a simple mediating structure.
Solution Approach 2:
The support structure for driven clutch plates is segmented into two parts: the original two-part structure (clutch member and pressure member spline fitting portions) and an additional retainer member. This segmentation allows the retainer member to specifically address the slipping prevention function without affecting the existing power transmission mechanism.
2Reliability
If back-torque limiting cams are used to absorb back-torque, then the separated portion is spread, but driven clutch plates can be easily slipped off into the separated portion
Solution Approach 1:
The retainer member serves as a mediator that remains effective under back-torque conditions. When back-torque limiting cams absorb back-torque and spread the separated portion, the retainer projection continues to prevent driven clutch plates from slipping into the enlarged separated portion, without requiring additional complex structures.
Solution Approach 2:
The retainer member is designed to be axially movable along the clutch member, allowing it to dynamically adapt to the changing position of driven clutch plates under back-torque conditions. The retainer projection can move with the driven clutch plates while maintaining its protective function against slipping into the separated portion.
Data Source
AI summary
A power transmitting apparatus can include a clutch housing rotatable together with an input member and supporting a plurality of driving clutch plates. A clutch member can support a plurality of driven clutch plates alternately arranged between the driving clutch plates via spline fitting and connected to an output member. A pressure member can be mounted on the clutch member and axially movably therealong for carrying out the pressure-contact or release between the driving clutch plates and the driven clutch plates. Back-torque limiting cams can be configured to release the connection between the driving clutch plates and the driven clutch plates when the rotation speed of the output member has exceeded that of the input member. A rotational force input to the input member can be transmitted to or cut-off from the output member by carrying out the pressure-contact or release between the driving clutch plates and the driven clutch plates. The driven clutch plates can be supported by a two-part structure in which some of the driven clutch plates are supported on the clutch member by a spline fitting portion and the other driven clutch plates are supported on the pressure member by a spline fitting portion. The power transmitting apparatus can further comprise a device or assembly configured to preventing slipping-off of the driven clutch plates into a separated portion between the spline fitting portion of the clutch member and the spline fitting portion of the pressure member.