Centrifugal Clutch Back-Torque Layout for Stable Engine Braking
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Solution Overview
Problem
Existing power transmission devices for two-wheeled vehicles risk damaging components like the pin 30 due to loads during power transmission, especially when the weight member moves to a radially outer position, and struggle to apply engine brake effectively when the pressure member is at a non-actuation position.
Innovation Solution
A power transmission device with a clutch housing, driving and driven clutch plates, a pressure member, a weight member, and a back torque transmission cam that allows engine brake application by bringing clutch plates into press contact even when the pressure member is at a non-actuation position, using a torque transmission portion to transmit rotational force without the back torque transmission cam, and a movement amount restriction portion to control clutch member movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the back torque transmission cam mechanism (long hole 32 and pin 30) is used to bring clutch plates into press contact for engine brake application, then engine brake can be applied when pressure member is at non-actuation position, but the pin 30 may be damaged by load during power transmission
Solution Approach 1:
The patent introduces a weight member as an intermediary element that mediates between the back torque transmission cam mechanism and the clutch plates. The weight member is movable within a guide hole and connects to the pin 30, allowing the cam mechanism to actuate the clutch plates through the weight member rather than directly through the pin, thereby reducing the load on the pin and preventing damage while maintaining engine brake capability
Solution Approach 2:
The patent segments the back torque transmission mechanism into multiple functional components: the back torque transmission cam mechanism (long hole 32), the pin 30, and the weight member. This segmentation allows each component to perform its specific function with optimized load distribution, where the weight member absorbs and distributes the forces, protecting the pin from excessive loads
2Stability of the object's composition
If the weight member is moved to radially outer position and pressure member is moved to actuation position for stable power transmission, then power transmission stability is improved, but the long hole 32 and pin 30 are still subjected to damaging loads
Solution Approach 1:
The weight member serves as a mediator that remains effective in protecting the pin 30 even when the pressure member is at the actuation position. The weight member's movement within the guide hole and its connection to the pin ensure that load paths are optimized regardless of the pressure member's position, maintaining both power transmission stability and pin durability
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 engine brake application by ensuring clutch plates are brought into press contact without damaging the pin 30, and allows controlled movement of the clutch member, preventing excessive power transmission and ensuring reliable actuation.
Implementation Method 1
a weight member (8) disposed in a groove portion provided in the clutch housing to extend in a radial direction, the weight member being movable from a radially inner position to a radially outer position of the groove portion by a centrifugal force due to rotation of the clutch housing
Data Source
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AI summary
There is provided a power transmission device that can apply engine brake by transmitting a rotational force on the side of a wheel to the side of an engine by bringing driving clutch plates and driven clutch plates into press contact with each other when a pressure member is located at a non-actuation position, and that allows power transmission to be performed stably when a weight member is moved to a radially outer position and the pressure member is moved to an actuation position. The power transmission device includes a back torque transmission cam that can bring the driving clutch plates 6 and the driven clutch plates 7 into press contact with each other by moving the second clutch member 4b when a rotational force is input to the first clutch member 4a via the output shaft 3 when the pressure member 5 is located at the non-actuation position, and a torque transmission portion that can transmit a rotational force transmitted to the second clutch member 4b to the first clutch member 4a not via the back torque transmission cam.