Back Torque Clutch Cam for Stable Engine Brake Actuation
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Solution Overview
Problem
Existing power transmission devices for two-wheeled vehicles face instability in actuation when applying engine brake due to the weight member's inability to maintain a constant position, leading to unstable actuation during engine brake application.
Innovation Solution
A power transmission device with a clutch housing that includes a weight member movable by centrifugal force, an interlocking member to move the pressure member from a non-actuation to an actuation position, and a back torque transmission cam that holds abutment between the interlocking member and the weight member, ensuring stable actuation by bringing driving and driven clutch plates into press contact even when the pressure member is at a non-actuation position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the clutch hub is moved in the direction away from the weight member to apply engine brake, then the driving clutch plates and driven clutch plates can be brought into press contact with each other, but the weight member cannot be held at a constant position, making subsequent actuation unstable
Solution Approach 1:
The patent introduces a back torque transmission cam as an intermediary mechanism between the weight member and the clutch plates. This cam mechanism transmits the back torque from the clutch plates to move the weight member to a constant position, thereby stabilizing the actuation while still allowing engine brake application through clutch plate press contact.
2Ease of operation
If a cam mechanism with long hole and pin is used to move the clutch hub, then the clutch plates can be brought into press contact, but the structure becomes complex and the weight member position cannot be maintained
Solution Approach 1:
The patent extracts the weight member position maintenance function from the complex cam mechanism with long hole and pin. By using a separate back torque transmission cam specifically dedicated to maintaining weight member position, the overall system complexity is reduced while still achieving both clutch actuation and stable weight member positioning.
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 solution enables stable actuation during engine brake application by ensuring consistent press contact between clutch plates, improving the reliability and efficiency of power transmission and preventing excessive power transmission to the engine.
Implementation Method 1
The weight member is movable, by a centrifugal force due to rotation of the clutch housing, from a radially inner position to a radially outer position of the groove portion
Data Source
AI summary
A power transmission device has a back torque transmission cam that brings driving clutch plates 6 and driven clutch plates 7 into press contact with each other. This occurs by moving a second clutch member 4b when a rotational force is input to a first clutch member 4a, via the output shaft 3. A pressure member 5 is located at a non-actuation position. A back torque transmission cam can hold abutment between an interlocking member 9 and weight member 8 by moving the second clutch member 4b in a direction of being brought into proximity to the interlocking member 9.