Vehicle Steering Wheel Horn Switch Electrical Isolation
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Solution Overview
Problem
Current horn switch apparatuses in vehicle steering wheels are costly to manufacture and not electrically isolated from the driver air bag assembly, complicating assembly and increasing overall costs.
Innovation Solution
A horn switch apparatus featuring switch assemblies with insulator bases, deflectable metal blades, and electrical conductors that are bridged upon deflection of the driver air bag assembly, allowing for reliable and inexpensive manufacturing with electrical isolation from the air bag assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional horn switch apparatuses are used in vehicle steering wheels, then horn activation function is achieved, but manufacturing cost increases and assembly complexity increases due to lack of electrical isolation from DAB assembly
Solution Approach 1:
The horn switch apparatus is segmented into separate switch assemblies that are electrically isolated from the DAB assembly. Each switch assembly includes its own insulator base, metal blade, and electrical conductor connections, allowing independent manufacturing and assembly without electrical interference with the air bag system.
Solution Approach 2:
An insulator base is introduced as an intermediary component between the metal blade and the base plate/DAB assembly. This insulator base provides electrical isolation while mechanically supporting the switch components, enabling cost-effective manufacturing without compromising electrical safety or assembly complexity.
2Ease of manufacture
If switch assemblies are electrically isolated from DAB assembly, then manufacturing cost decreases and assembly simplifies, but electrical connection reliability may be compromised
Solution Approach 1:
The insulator base serves as a mediator that maintains reliable electrical connections within the switch assembly while providing electrical isolation from the DAB assembly. The metal blade makes reliable contact with electrical conductors on the insulator base, ensuring horn activation reliability without compromising manufacturing cost or assembly simplicity.
Solution Approach 2:
The insulator base provides a cost-effective solution for electrical isolation that does not compromise reliability. By using inexpensive insulating materials and simple structural design, the apparatus achieves both cost reduction and maintained electrical connection reliability in the horn switching function.
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 solution provides a cost-effective and reliable horn switch apparatus that is easy to install, with reduced complexity in assembly and improved electrical isolation, contributing to lower overall costs and simplified component integration.
Implementation Method 1
a deflectable metal blade disposed atop the insulator base substantially parallel to the base plate. In each switch assembly, the metal blade is anchored to the insulator base at one end and deflectable toward the base plate at the other end
Implementation Method 2
A driver air bag (DAB) assembly resiliently secured to the base plate has a set of posts that extend toward the base plate
Data Source
AI summary
A set of horn switch assemblies are mounted on a base plate of a vehicle steering wheel and linked by two continuous electrical conductors that are electrically bridged to activate a horn. Each switch assembly includes an insulator base affixed to the base plate and a deflectable metal blade disposed atop the insulator base substantially parallel to the base plate. The metal blade is anchored to the insulator base at one end and deflectable toward the base plate at the other end. One electrical conductor is secured to the insulator base below and in contact with the anchored end of the metal blade, while the other electrical conductor is secured to the insulator base below and out of contact with the deflectable end of the metal blade. A driver air bag assembly deflects the metal blades to electrically bridge the two electrical conductors for activating the horn.