Shift Lever Mounting Structure for Straddle Vehicle
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Solution Overview
Problem
In straddle-type vehicles, the mounting of a shift lever and a cushion rod often overlap with the body frame, leading to increased vehicle width, compromised riding position, and difficulties in tool access for assembly and maintenance.
Innovation Solution
A mounting structure where the shift lever is positioned on the outer side of the body frame in the vehicle width direction, and the cushion rod on the inner side, with an opening portion allowing them to overlap, thus avoiding an increase in vehicle width and improving accessibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the mounting portion of the shift lever and the mounting portion of the cushion rod are disposed close to each other on the body frame, then the vehicle width is reduced and the riding position is improved, but it becomes difficult to secure a tool line for mounting the cushion rod
Solution Approach 1:
The patent utilizes the opening portion in the body frame to create a dimensional pathway through the frame structure. The tool line is secured by routing tools through this opening portion, transforming a two-dimensional mounting space constraint into a three-dimensional solution where tools can access the inner side mounting portion through the opening, thus enabling close mounting without compromising assembly accessibility
2Length of moving object
If the mounting portion of the shift lever and the mounting portion of the cushion rod overlap in the vehicle width direction, then the vehicle width is reduced, but the assemblability of the cushion rod deteriorates
Solution Approach 1:
The opening portion in the body frame acts as an intermediary access point. It provides a pathway that allows tools to reach the inner side mounting portion of the cushion rod through the frame structure, enabling assembly operations without requiring excessive vehicle width or compromising the overlapping mounting configuration
Data Source
AI summary
A mounting structure of a shift lever on a body frame which swingably supports a swing arm includes the shift lever configured to receive a shift operation from a driver, a rear cushion configured to extend and contract according to swinging of the swing arm, a cushion lever connecting the rear cushion and the swing arm, and a cushion rod connecting the cushion lever and the body frame. A mounting portion of the shift lever is disposed on an outer side of the body frame in a vehicle width direction. A mounting portion of the cushion rod is disposed on an inner side of the body frame in the vehicle width direction. An opening portion is formed on the body frame. The mounting portion of the shift lever and the mounting portion of the cushion rod overlap the opening portion in a side view.