Shift Lever Button Converter Layout for Quiet Slider Motion
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Solution Overview
Problem
Conventional shift levers experience abnormal sounds and unstable slider movements due to rotation moments reversing during button manipulation, leading to collisions and reduced operational comfort.
Innovation Solution
The shift lever design includes a slider with a pushed surface that curves away from the central axis of the push rod, guided by offset rollers, ensuring a consistent rotation moment direction and stable slider posture, preventing collisions and improving smooth operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the slope of the slider extends across the push rod position, then the button manipulation can convert rearward push to downward shift, but the rotation moment reverses direction causing the slider to collide with the guide hole wall and produce abnormal sounds
Solution Approach 1:
The pushed surface is positioned asymmetrically on the slider, occupying only the region away from the central axis of the push rod in the releasing direction. This asymmetric positioning ensures that the rotation moment always acts in the same direction during button manipulation, preventing the slider from tilting and colliding with the guide hole wall, thereby eliminating abnormal sounds while maintaining operational functionality
2Productivity
If the slope extends across the push rod position, then the slider can convert button push momentum to axial movement, but the reversing rotation moment causes the slider to tilt and rub against the guide hole wall, impeding smooth sliding
Solution Approach 1:
The pushed surface is positioned asymmetrically on one side of the slider, away from the central axis of the push rod. This asymmetric design ensures that the rotation moment consistently acts in one direction, preventing the slider from tilting during operation. The slider maintains stable contact with the guide hole wall through offset rollers, ensuring smooth sliding while efficiently converting button push momentum to axial movement for rapid range changes
3Stability of the object's composition
If the pushed surface is positioned to prevent rotation moment reversal, then the slider maintains stable posture, but the button manipulation force distribution changes
Solution Approach 1:
The pushed surface is positioned asymmetrically on the slider, away from the central axis of the push rod in the releasing direction. This asymmetric positioning creates a consistent rotation moment that stabilizes the slider posture during button manipulation. The offset rollers compensate for the changed force distribution by providing additional support and guidance, ensuring that the slider maintains stable contact with the guide hole wall throughout the manipulation process
Solution Approach 2:
Offset rollers are introduced as intermediary elements between the slider and the guide hole wall. These rollers provide additional support and guidance, helping to distribute the manipulation force more evenly while maintaining the stable slider posture achieved through the asymmetric pushed surface positioning. The rollers act as mediators that accommodate the changed force distribution without compromising slider stability
Data Source
AI summary
A shift lever includes a lever main body and a shift knob located at a distal end of the main body. The lever main body has a lever shaft and a push rod located in the lever shaft. The shift knob has a button for unlocking that receives a pushing manipulation force in a direction intersecting the push rod, a holder fixed to the lever shaft for holding the button, and a converter that converts a momentum in a pushing manipulation direction of the button into a momentum in an axial direction of the push rod to shift the push rod. The converter has a pushed surface to be pushed by the button, the pushed surface occupying only a region of the converter that is away from a central axis of the push rod in a releasing direction that is opposite to a pushing direction.