Motorcycle Clutch Receiving Member Clearance Under Centrifugal Load
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Solution Overview
Problem
Existing power transmission devices in motorcycles experience increased sliding resistance due to centrifugal forces at high speeds, leading to dull clutch engagement responsiveness and unpleasant operability sensations for drivers.
Innovation Solution
Incorporation of a radially-outside restricting portion, including a flange portion and contact surface, to restrict the radially-outward movement of the receiving member relative to the pressure member, maintaining clearance and reducing sliding resistance through conforming shapes and attachments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the receiving member is allowed to move radially outward under centrifugal force at high speeds, then the back-torque limiting cam can function to reduce press-contact force, but the sliding resistance increases causing dull clutch engagement responsiveness
Solution Approach 1:
The receiving member is divided into a first receiving member and a second receiving member that can move relative to each other in the radial direction. This segmentation allows the second receiving member to move radially outward under centrifugal force to maintain the back-torque limiting function, while the first receiving member remains positioned to minimize sliding resistance and ensure responsive clutch engagement.
Solution Approach 2:
A guiding member is introduced as an intermediary component that guides the movement of the second receiving member radially outward while maintaining proper alignment. This guiding mechanism ensures that the second receiving member moves smoothly without creating excessive sliding resistance, thereby preserving both the back-torque limiting function and clutch responsiveness.
2Force
If the receiving member moves radially outward to reduce press-contact force, then back-torque limitation is achieved, but the clearance between receiving member and clutch member decreases
Solution Approach 1:
By dividing the receiving member into two separate members that can move independently in the radial direction, the system allows the second receiving member to move outward for back-torque limitation while the first receiving member maintains the necessary clearance with the clutch member.
Solution Approach 2:
The solution introduces radial movement as an additional degree of freedom between the first and second receiving members. This dimensional change allows the system to simultaneously achieve back-torque limitation through radial movement of the second member while maintaining axial clearance through the positioning of the first member.
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
Improves clutch engagement responsiveness and operability by reducing sliding resistance, enhancing the overall performance of the power transmission device.
Implementation Method 1
An urging member moves the pressure member in a direction such that the drive-side clutch plates and the driven-side clutch plates are pressed against each other
Implementation Method 2
A receiving member, constituted by a separate member, is attached to the pressure member. The receiving member receives an urging force of the urging member on the pressure member side. It transmits the urging force to the pressure member
Implementation Method 3
A back-torque limiting cam, constituted by a pair of cam surfaces, reduces a press-contact force between the drive-side clutch plates and the driven-side clutch plates. The pressure member and the clutch member rotate relative to each other when a rotation speed of the output member exceeds a rotation speed of the input member
Implementation Method 4
when the entire device, including the pressure member and the clutch member, rotates at a high speed, the receiving member is pressed against the clutch member, which is positioned radially outside, by a generated centrifugal force
Data Source
AI summary
A power transmission device has a pressure member 5, drive-side clutch plates, driven-side clutch plates, a clutch spring 10, a separate receiving member 11, and a back-torque limiting cam. A radially-outside restricting portion restricts radially-outward movement of the receiving member 11 relative to the pressure member 5. This maintains clearance t between a side surface 11d of the receiving member 11 and an inner peripheral wall 4e of a clutch member 4.