Motorcycle Gear Shift Lever Assembly with Adjustable Mount Insert
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Solution Overview
Problem
Standard motorcycle shift lever assemblies are not adjustable for riders with non-standard foot sizes or physical limitations, leading to compromised balance and safety due to fixed installation positions and material stress issues resulting in frequent failures at the splined groove connection.
Innovation Solution
A shift lever assembly with an independent spindle shaft mount insert that allows for fine-tuning of vertical and horizontal positions, enabling the use of different materials and providing additional adjustment options, including the ability to position the splined groove hole off-center, for improved fit and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed standard position is used for the shift lever assembly, then the device complexity is reduced and manufacturing is simplified, but the adaptability for riders with non-standard foot sizes or physical limitations deteriorates
Solution Approach 1:
The shift lever assembly is divided into separable components: the shift lever arm, the spindle shaft, and the mounting bracket. This segmentation allows the mounting bracket to be independently positioned at different locations along the shift lever arm, enabling height adjustment while keeping the overall structure relatively simple.
Solution Approach 2:
The mounting bracket is designed to be repositionable along the shift lever arm, transforming the fixed position into a dynamic, adjustable configuration. This allows the shift lever height to be adapted to different rider needs while maintaining a simple base structure that can be configured in multiple positions.
2Ease of manufacture
If the shift lever arm is constructed from a single material type, then the manufacturing process is simplified, but the strength and stress distribution at critical areas deteriorates
Solution Approach 1:
The mounting bracket is made from a different material or with different structural properties than the shift lever arm itself. This local quality change allows the connection area to be optimized for strength and stress resistance, while the rest of the shift lever arm can be manufactured more simply.
Solution Approach 2:
The shift lever assembly uses composite construction with the mounting bracket potentially made from a different material than the shift lever arm. This composite approach allows each component to be optimized for its specific functional requirements, with the bracket providing enhanced strength at the critical connection point.
3Stability of the object's composition
If the splined groove hole is positioned at the center of the shift lever arm, then the structural symmetry is maintained, but the adjustment precision and range deteriorates
Solution Approach 1:
The mounting bracket is designed with an asymmetric configuration where the splined groove hole is positioned off-center relative to the shift lever arm. This asymmetry enables more precise adjustment of the shift lever height and position, allowing for fine-tuned customization while the bracket itself maintains structural integrity.
Data Source
AI summary
A gear shift lever assembly includes a gear shift lever arm which includes a distal foot-peg end and a bifurcated proximal end and first passageway for facilitating securement of the gear shift lever arm to a gear selector spindle shaft of a motorcycle. The assembly also includes a spindle shaft mount insert sized to fit within the bifurcated ends of the gear shift lever arm. The insert has a splined aperture that matches the splines of the splines of the gear selector spindle shaft, and a second passageway having a longitudinal axis transverse to the longitudinal axis of the splined aperture. The gear shift lever assembly is mountable to the gear selector spindle shaft of the motorcycle with the spindle shaft mount insert interposed between the bifurcated proximal end of the gear shift lever arm with a mounting bolt passed through the aligned first and second passageways.