Clutch Cam Layout for Stable Power Transmission and Engine Braking
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Solution Overview
Problem
Existing power transmission devices for two-wheeled vehicles face issues with stable power transmission and engine braking, as the weight member's centrifugal force can damage components and fail to maintain consistent press-contact between clutch plates, leading to potential power transmission failures.
Innovation Solution
A power transmission device with a clutch housing, driving and driven clutch plates, and a pressure member that moves between actuation and non-actuation positions, utilizing a back torque transmission cam to bring clutch plates into press contact without relying on the back torque transmission cam, and a press-contact assist cam to enhance the press-contact force, along with a movement amount restriction portion to control clutch member movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the weight member is moved to the radially outer position using centrifugal force to bring clutch plates into press contact, then power transmission is enabled, but the pin in the long hole cam mechanism may be damaged by excessive load
Solution Approach 1:
The clutch member is divided into a first clutch member and a second clutch member, with driven clutch plates attached to the second clutch member. This segmentation allows the back torque transmission cam to move the second clutch member independently, separating the power transmission function from the engine braking function, thereby preventing excessive load on the pin during normal power transmission while enabling reliable engine braking when needed.
2Ease of operation
If the back torque transmission cam is used to bring clutch plates into press contact for engine braking, then engine brake is applied, but power transmission stability is compromised when the weight member is at the radially outer position
Solution Approach 1:
The second clutch member acts as an intermediary element that can be moved by the back torque transmission cam to bring driven clutch plates into press contact with driving clutch plates. This intermediary mechanism enables engine braking through the cam mechanism without requiring the weight member to be at a specific position, thus maintaining power transmission stability while preserving engine braking capability.
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
Enables stable power transmission and effective engine braking by ensuring consistent press-contact between clutch plates, even when the weight member is at a radially outer position, reducing the risk of component damage and maintaining efficient power transfer.
Implementation Method 1
A weight member moves from a radially inner position to a radially outer position of a groove portion using a centrifugal force due to rotation of a clutch housing
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. A second clutch member 4b is moved when a rotational force is input to a first clutch member 4a via the output shaft 3. The pressure member 5 is located at a non-actuation position. A torque transmission portion transmits a rotational force transmitted to the second clutch member 4b to the first clutch member 4a not via the back torque transmission cam.