Clutch Spring Load Matching for Smooth Power Transmission
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Solution Overview
Problem
Existing power transmission devices in motorcycles experience a dead zone and surprise feeling during power transmission due to a significant difference in loads between the release spring and clutch spring, affecting operability.
Innovation Solution
Incorporating a cushioning member with a spring set to a load that compresses before the clutch spring, ensuring continuous movement and reducing the dead zone by compressing both the release spring and clutch spring simultaneously.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the set load of the clutch spring is larger than the maximum load of the release spring, then the clutch spring can provide sufficient pressing force, but a dead zone occurs where the interlocking member stops moving, causing a feeling of surprise and reduced operability
Solution Approach 1:
The patent changes the load parameter of the clutch spring so that its set load is smaller than the maximum load of the release spring. This parameter adjustment ensures that both springs compress continuously during the engagement process, eliminating the dead zone and the feeling of surprise while maintaining sufficient pressing force for reliable power transmission.
Solution Approach 2:
The patent applies beforehand cushioning by ensuring the clutch spring is pre-compressed to a程度 where it can work together with the release spring from the beginning of the engagement process. This prior cushioning arrangement prevents the interlocking member from stopping during movement, thereby eliminating the dead zone and improving operability.
2Reliability
If the difference between the maximum load of the release spring and the set load of the clutch spring is large, then the clutch engagement force is sufficient, but a dead zone occurs where power transmission is delayed, affecting operability
Solution Approach 1:
The patent optimizes the load parameters by setting the clutch spring's set load to be smaller than the maximum load of the release spring. This parameter change ensures continuous compression of both springs during engagement, eliminating the dead zone and improving operability while maintaining reliable clutch engagement through the combined pressing force of both springs.
Solution Approach 2:
The patent ensures continuity of useful action by configuring the spring loads so that both the release spring and clutch spring compress continuously throughout the engagement process. This continuous compression eliminates the dead zone where the interlocking member would otherwise stop, ensuring smooth and continuous power transmission without delays.
3Force
If the clutch spring is compressed only after the release spring compression is finished, then the pressing force is built up gradually, but a dead zone occurs causing a feeling of surprise during power transmission
Solution Approach 1:
The patent applies preliminary action by pre-compressing the clutch spring to a程度 where it begins working before the release spring compression is finished. This preliminary action ensures that both springs are compressing simultaneously, which eliminates the dead zone and prevents the feeling of surprise during power transmission while still allowing gradual force buildup.
Solution Approach 2:
The patent changes the load parameter of the clutch spring to be smaller than the maximum load of the release spring, which enables the clutch spring to start compressing earlier in the engagement process. This parameter change creates overlapping compression periods for both springs, eliminating the dead zone and improving operability.
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
This solution effectively suppresses the surprise feeling during power transmission and improves operability by eliminating the dead zone and ensuring smooth engagement of the clutch.
Implementation Method 1
The weight member is movable from a radially-inner position to a radially-outer position in the groove portion due to a centrifugal force generated by rotation of the clutch housing
Implementation Method 2
A release spring applies an urging force while allowing movements of the interlocking member and the pressure member until the drive-side clutch plates and the driven-side clutch plates reach an engaged state before being pressed against each other
Implementation Method 3
A clutch spring applies a press-contact force between the drive-side clutch plate and the driven-side clutch plate while allowing movement of the interlocking member
Data Source
AI summary
A power transmission device has an interlocking member 9 moving a pressure member 5 from an inactive position to an active position. A release spring (m) applies an urging force, while allowing movements of the interlocking member 9 and the pressure member 5, until drive-side clutch plates 6 and driven-side clutch plates 7 reach an engaged state before the drive-side clutch plates 6 and the driven-side clutch plates 7 are pressed against each other. A clutch spring 11 is compressed in a process where the interlocking member 9 moves after the drive-side clutch plates 6 and the driven-side clutch plates 7 have reached the engaged state. The clutch spring applying a press-contact force between the drive-side clutch plates 6 and the driven-side clutch plates 7 while allowing movements of the interlocking member 9 and the pressure member 5. The set load of the clutch spring 11 is set to be smaller than the maximum load of the release spring (m).