Vehicle Switch Button Guide Projections Prevent Wobble
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Solution Overview
Problem
Existing switch devices for vehicle security systems experience wobbling and reduced operability due to mismatched dimensional tolerances, leading to inclined button pushing and potential failure of contact points to meet, which compromises the strength and functionality of the slider and button.
Innovation Solution
The switch device incorporates a slider with guide projection portions and a holder with guide grooves, along with engaging and fitting-in portions on the button and holder, to ensure precise alignment and stability, preventing wobbling and enhancing the strength of the sliding components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If gaps are provided between sliding portions of the holder and the button/slider to enable sliding motion, then the button and slider can move smoothly, but the gaps become large when dimensional tolerances do not match, causing the button to wobble and push in an inclined state
Solution Approach 1:
Guide projection portions and guide groove portions are introduced as intermediary elements between the button/slider and the holder. These guide features constrain the sliding motion to a precise linear path, preventing wobble and inclination while still allowing smooth movement. The guide projections fit into the guide grooves, creating a controlled interface that eliminates the harmful effects of large gaps caused by dimensional tolerances.
2Ease of operation
If the area of sliding portions is decreased to improve operability, then the button and slider can slide more precisely, but the strengths of the sliding portions are decreased and they become likely to be damaged
Solution Approach 1:
The sliding interface is segmented into multiple discrete guide projection portions and guide groove portions distributed around the circumference. This segmentation allows each individual guide feature to be small and precise (improving sliding precision) while the collective arrangement of multiple segments provides distributed load bearing and overall structural strength. The guide projections are positioned at specific intervals to optimize both precision and strength.
3Manufacturing precision
If guide projection portions are made to extend in the sliding direction to prevent wobble, then alignment precision is improved, but the guide projection portions become more prone to damage due to increased stress concentration
Solution Approach 1:
The guide projection portions are designed with non-uniform geometry along their length. The cross-sectional area and wall thickness are increased at the base (root) of the projections where stress concentration occurs, while the tip portions remain slender to maintain precise guiding function. This local quality variation allows the projections to achieve both high alignment precision and resistance to damage from stress concentration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration allows for stable and precise sliding motion of the button and slider, ensuring effective contact between the movable and fixed contact points, thereby improving operability and reducing the likelihood of wobbling and strength degradation.
Implementation Method 1
an elastic member that is accommodated in the case and urges the slider and the movable contact point toward the button
Implementation Method 2
an activation electric wave that operates the portable device is transmitted from the coil antenna
Implementation Method 3
the portable device communicates with the in-vehicle device by using an electromotive force generated by an internal coil
Data Source
AI summary
A switch device includes a button, a slider, and a holder in which the button and the slider are slidably held. The slider includes first guide portions. The holder includes: a first holding portion which holds the button; a second holding portion which holds the slider; and second guide portions engaged with the first guide portions. The button includes: a protrusion wall interposed between the second holding portion and the slider; and engaging portions provided in the protrusion wall and engaged with guide projection portions. At least one guide projection portion is provided to extend in a sliding direction of the slider, and a fitting-in portion into which an end portion of the protrusion wall is fitted is provided on a side surface of the guide projection portion extending in the sliding direction.