Linear Snap Switch Assembly for Compact Parking Brake Controls
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Solution Overview
Problem
Existing electronic parking brake switches have large footprints due to rotating parts, necessitating a need for smaller, more compact designs.
Innovation Solution
A snap switch design utilizing a housing with fixed and movable electrical contacts, actuator, and multiple springs (first, second, and third) that apply forces in opposing directions, allowing the movable part to translate vertically, eliminating rotating parts and enabling a smaller footprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rotating parts are used in the switch design, then the switch can achieve snap position activation, but the footprint becomes large (7.4 mm×15.4 mm or 8.4 mm×15.4 mm)
Solution Approach 1:
The patent transitions from a rotational movement mechanism to a linear translational movement mechanism. The movable part moves along a linear path between first and second positions, eliminating the need for rotational components and reducing the footprint to approximately 6.5 mm×7.5 mm while maintaining snap position activation capability.
Solution Approach 2:
The patent removes the rotation axis and rotational moving parts from the design. By extracting the rotational mechanism and replacing it with a linear translation system comprising a movable part that shifts position along a straight line, the footprint is significantly reduced while the snap activation function is preserved through spring-loaded engagement.
2Area of stationary object
If the switch footprint is reduced to accommodate space constraints, then smaller space is required, but the mechanism becomes more complex to achieve snap-through movement
Solution Approach 1:
The patent combines the actuator, movable part, and spring mechanism into a compact integrated assembly. The movable part is positioned between first and second springs, with the actuator directly coupled to enable linear translation. This merging of components achieves the snap-through movement in a compact footprint of approximately 6.5 mm×7.5 mm without excessive complexity.
3Area of stationary object
If linear translation is used instead of rotation, then the footprint is reduced to approximately 6.5 mm×7.5 mm, but the force application mechanism becomes more complex with multiple springs
Solution Approach 1:
The patent uses a system of springs to create balanced force conditions. The movable part is positioned between first and second springs that apply forces in opposite directions, with a third spring providing additional force. This counterbalancing spring system enables controlled linear translation and snap-through movement while maintaining a compact footprint of approximately 6.5 mm×7.5 mm.
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
The design achieves a smaller footprint of approximately 8.5 mm×8.5 mm, customizable force and travel characteristics, and momentary activation with short switching times, while maintaining electrical connectivity changes through snap-through and snap-back movements.
Implementation Method 1
a first spring located between the actuator and the movable part and applying a first force on the movable part in a first direction
Implementation Method 2
a second spring located between the actuator and the movable part and applying a second force on the movable part in a second direction, the second direction being opposite the first direction
Implementation Method 3
a third spring applying a reaction force on the movable part
Data Source
AI summary
Movable electrical contacts on a movable part of a snap switch can be in a first position relative to fixed electrical contacts on a housing when vertical forces applied by a first spring and a second spring and a reaction force applied by a third spring cause the movable part to be in an upper position within the housing. The movable electrical contacts can be in a second position relative to the fixed electrical contacts when the vertical forces applied by the first spring and the second spring and the reaction force applied by the third spring cause the movable part to be in a lower position within the housing. The first spring and the second spring can apply forces on the movable part in opposite directions, and the movable part can vertically move between the upper stop position and the lower stop position.