Automotive Push Switch V-Shaped Recess Noise Reduction
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Solution Overview
Problem
Conventional automotive push switches used for lighting control in brake pedals produce a noticeable hitting sound due to the impactive force when the operating shaft interacts with the guide hole, which can be distracting and undesirable.
Innovation Solution
The design incorporates a groove-like recess with a V-shaped cross section on the outer circumference of the operation shaft and an arc-shaped projection on the inner circumference of the hollow pipe, allowing the impactive force to be decomposed and dispersed along the slope, reducing the noise generated during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the operating shaft directly contacts the guide hole surface during movement, then the structural simplicity is maintained, but the hitting sound increases due to impactive force
Solution Approach 1:
The patent introduces a recess on the operating shaft that acts as an intermediary between the shaft and the guide hole. When the shaft moves, the recess engages with the guide hole surface, allowing the impactive force to be distributed along the sloped surfaces of the recess rather than concentrated at a single contact point, thereby reducing the hitting sound while maintaining structural simplicity
Solution Approach 2:
The patent modifies the geometric parameters of the operating shaft by adding a recess with specific angular slopes. This changes the contact geometry from a point contact to a surface contact with distributed force vectors, transforming the impact characteristics and reducing the noise generated during movement
2Ease of operation
If the operating shaft is pressed obliquely during brake pedal rotation, then the mechanical operation is achieved, but the impactive force causes noise
Solution Approach 1:
The patent converts the harmful oblique impactive force into a beneficial distributed force by designing the recess with sloped surfaces. The oblique pressure from the brake pedal arm is redirected through the recess slopes, dispersing the force along multiple contact surfaces and transforming the noisy impact into a quieter, distributed mechanical action
Data Source
AI summary
A groove-like recess, substantially V-shaped, extending vertically is formed on the outer circumference of an operation shaft, and a projection engaging the recess is provided on a guide hole, namely the inner circumference of a hollow pipe. Such makeup provides an automotive push switch that reduces an impactive force caused when the recess hits the projection within the movable range of the operation shaft, by decomposing or dispersing the force according to the inclination angle of the slope, and so does the hitting sound.