Straddled Vehicle Brake Cable Routing and Support
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Solution Overview
Problem
In straddled vehicles with a one-downtube frame structure, the increased curvature of the combined brake cable affects operability and routing workability, and the conventional support methods can lead to interference with the engine, making it difficult to maintain the cable's position and prevent heat transfer.
Innovation Solution
The combined brake cable is routed to pass through a larger space below the main frame, bent downward to decrease curvature, and supported by a side-mounted member to avoid engine interference, ensuring proper alignment and heat protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the combined brake cable is routed along the main frame from the head pipe, then the brake system structure is simplified, but the curvature of the combined brake cable is increased, deteriorating operability and routing workability
Solution Approach 1:
The combined brake cable is routed through a different spatial dimension by passing through the right downtube instead of along the main frame. This dimensional change in the routing path reduces the cable's curvature while maintaining structural simplicity, thereby improving operability and routing workability
2Device complexity
If the downtube passing the central portion of the vehicle is caused to support the combined brake cable, then the frame structure is simplified, but the combined brake cable easily interferes with the engine
Solution Approach 1:
The combined brake cable routing is extracted from the central frame path and relocated to the right downtube. This separation removes the cable from the interference zone with the engine while maintaining frame structure simplicity, effectively resolving the harmful interaction between the cable and engine
Data Source
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AI summary
A straddled vehicle 10 includes a combined brake system 1 operating a front wheel brake 68 and a rear wheel brake 69 in a combined manner. The combined brake system 1 includes a front wheel brake actuator 80 provided on a handle 62 and actuating the front wheel brake 68 in response to an operation made by a rider; a rear wheel brake actuator 90 provided to the rear of, and below, the front wheel brake actuator 68 and actuating the rear wheel brake 69 in response to an operation made by the rider; and a combined brake cable 5 connected with the front wheel brake actuator 80 and with the rear wheel brake actuator 90 and transmitting an operational force applied to the rear wheel brake actuator 90 to the front wheel brake actuator 80. The front wheel brake actuator 80 is located in a right area RA of the vehicle 10. The combined brake cable 5 is routed in the right area RA, and at least partially overlaps an engine 63 as seen in a vehicle side view. The vehicle 10 further includes a support member 101 supporting the combined brake cable 5 at a position to the side of the engine 63.