Motorcycle Synchronized Transmission Cam Actuator
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Solution Overview
Problem
Existing synchronized transmissions in vehicles require precise and repeatable actuation sequences for synchronizers to achieve different transmission speeds, which is challenging to implement effectively.
Innovation Solution
A synchronized transmission system with a specific arrangement of toothed pulleys and belts, including a centrifugal clutch and actuated synchronizers, allows for precise control of speed changes through a predetermined sequence using an electric motor and cam followers, ensuring consistent engagement and disengagement of gear ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two synchronizers are provided with precise actuation sequences, then different transmission speeds can be achieved, but the actuation timing and sequence control becomes complex and difficult to implement
Solution Approach 1:
The patent combines the actuation control of two synchronizers into a single integrated mechanism. The cam actuator with follower simultaneously controls both synchronizers through mechanically linked cam lobes, eliminating the need for separate actuation systems and reducing overall control complexity while maintaining the ability to achieve different transmission speeds
Solution Approach 2:
The patent introduces a cam actuator as an intermediary mechanism between the control input and the two synchronizers. The cam profile acts as a mediator that automatically sequences the actuation of both synchronizers through its geometric design, transforming a complex timing control problem into a simple mechanical follower movement
2Ease of operation
If synchronizers are actuated with precise sequence and timing, then speed changes can be controlled, but repeatable and continuous operation becomes challenging
Solution Approach 1:
The cam actuator mechanism is designed to automatically reset and repeat its cycle without external intervention. The mechanical follower returns to its initial position after each actuation cycle through spring force or gravitational action, enabling the cam lobes to automatically re-engage and repeat the precise sequencing for continuous reliable operation
Solution Approach 2:
The patent employs periodic cyclic action through the cam actuator mechanism. The cam lobes are designed with periodic profiles that automatically repeat the synchronizer actuation sequence at regular intervals, ensuring consistent and reliable speed changes with each transmission cycle without requiring complex control systems
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 guarantees the implementation of each synchronizer according to a prefixed scheme, ensuring repeatable and efficient speed changes without clutch or sliding losses, enhancing the transmission's reliability and efficiency.
Implementation Method 1
a centrifugal clutch and actuated synchronizers
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A synchronized transmission (1) used in a motorcycle, wherein a crankshaft actuated by the engine and a driven shaft, connected to a rear wheel, are substantially parallel and kinematically connected therebetween, comprising a first axial actuation synchronizer (16) placed at the front of the crankshaft (2) and a second axial actuation synchronizer (17) arranged at the front of a driven shaft kinematically connected to a rear wheel, each synchronizer (16, 17) comprising a respective rotating cam actuator (26, 29) having a cam (29) apt to be rotated by a respective cam spindle (30) by determining a translation thereof which interferes with an actuation end of the respective synchronizer (16, 17).