Motorcycle Shift Sensor Layout for Short Shift Rod Packaging
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Solution Overview
Problem
The challenge is to provide a compact shift device for a straddle-type vehicle where a sufficient length of the shift rod cannot be ensured, making it difficult to integrate a shift sensor effectively.
Innovation Solution
The shift device incorporates a shift sensor that is integrally rotatable with the shift shaft, functioning as a link arm to couple the shift shaft and shift rod, allowing the sensor to detect shift operations and reduce the device's size by positioning the operation portion and sensor on the same side as the shift rod.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the shift sensor is integrally provided on the shift rod, then the shift operation can be detected, but the shift rod length becomes insufficient in certain layouts
Solution Approach 1:
The patent merges the shift sensor and link arm into a single integrated component. The shift sensor is mounted on the link arm, combining the mechanical linkage function with the sensing function into one unit, thereby eliminating the need for a separate long shift rod while still enabling shift operation detection.
2Adaptability or versatility
If the shift rod is made longer to accommodate the shift sensor, then the sensor can be provided, but the device size increases
Solution Approach 1:
The shift sensor and link arm are combined into one integrated component, allowing the sensor to be positioned close to the shift shaft without requiring a long shift rod. This integration maintains sensor functionality while significantly reducing the overall device volume.
3Ease of operation
If a separate link arm is provided in addition to the shift rod, then the shift mechanism functions, but the number of components increases
Solution Approach 1:
The link arm and shift sensor are merged into a single integrated component. The link arm serves as the mounting structure for the shift sensor, eliminating the need for a separate link arm component while maintaining the mechanical linkage functionality between the shift lever and shift shaft.
Data Source
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AI summary
There is provided a shift device for a straddle-type vehicle that is configured to cause a transmission device to perform a shift change in accordance with rotation of a shift shaft. The shift device includes: a shift lever provided with an operation portion that is configured to receive a shift operation; a shift sensor provided on the shift shaft so as to be integrally rotatable with the shift shaft; and a shift rod that couples the shift lever and the shift sensor. The shift sensor is configured to detect the shift operation on the shift lever in accordance with a movement of the shift rod. The operation portion and the shift sensor are positioned at the same side in a manner of sandwiching the shift rod.