Motorcycle Wire Harness Layout for Flexible Add-On Device Integration
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Solution Overview
Problem
The existing connector supporting structures for vehicles, such as those described in Japanese Unexamined Patent Publication No. 2012-066669, lack a high degree of freedom for additionally equipping devices, limiting the flexibility and versatility of device integration.
Innovation Solution
A straddled vehicle design that includes a body frame, a wire harness with a main line and branch line, and a vehicle controller, where the wire harness allows for connection of additional devices through a second electric line, enhancing the degree of freedom for device integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a connector supporting structure is used to connect additional devices, then device integration is achieved, but the degree of freedom for additionally equipping devices is limited
Solution Approach 1:
The wire harness is designed with multiple connectors (first connector, second connector, third connector, fourth connector) that can serve different functions. The main line and branch line configuration allows the same wire harness to support both the vehicle controller and additional devices, making the system universally adaptable to different device integration scenarios without requiring separate dedicated wiring for each device.
Solution Approach 2:
The wire harness is segmented into a main line and a branch line, with the branch line branching from an intermediate portion of the first electric line in the main line. This segmentation allows independent connection points for different devices, enabling flexible device integration while maintaining a structured and manageable wiring system that doesn't become overly complex.
2Adaptability or versatility
If connectors are disposed at various positions for device connection, then device integration flexibility is improved, but connector protection becomes difficult
Solution Approach 1:
The patent introduces intermediate structures such as the storage box and footboard as mediators to protect connectors. The fourth connector is disposed below the occupant seat or in the storage box, using these structures as protective intermediaries. The footboard protects portions of the main line, creating a layered protection system that maintains connector accessibility while providing physical protection through intermediate elements.
Data Source
AI summary
A straddled vehicle includes a body frame, a wire harness, and a vehicle controller. The body frame includes a head pipe that supports a steering device. The wire harness includes a main line at least a portion of which is laid along the body frame and a branch line that is branched from the main line. The main line includes a first electric line having one end connected to a first connector and another end connected to a second connector and a second electric line having one end connected to a third connector and another end connected to a fourth connector. The branch line includes a branch electric line branched from an intermediate portion of the first electric line and a terminal connected to the vehicle controller. The fourth connector is disposed more rearward than the head pipe and the third connector is disposed more forward than the fourth connector.