Automotive Ignition Rotor Retainer Mechanism
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Solution Overview
Problem
Existing ignition devices for automotive vehicles are prone to involuntary loss of electrical contact due to rotor position changes caused by vibrations or accidental movements, leading to unintended engine stops while the vehicle is running.
Innovation Solution
An ignition device with a rotor mounted on a bracket and a retainer that applies a linear force to inhibit rotation in specific directions, allowing controlled rotation beyond predetermined positions with an applied force, enhancing security by preventing involuntary key position changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a mechanical system is used to maintain the key in a steady position, then the key position stability is improved, but involuntary key position changes occur due to vibrations or accidental movements
Solution Approach 1:
The retainer applies a preliminary linear force on the rotor in the opposite direction to potential vibration-induced movement, preventing the rotor from moving beyond the predetermined angular position before the harmful effect (vibration) occurs
Solution Approach 2:
The system prepares for potential involuntary movement by having the retainer pre-positioned to apply restraining force, and by designing the bracket-retainer cooperation to inhibit rotation in the predetermined direction from the predetermined angular position
2Ease of operation
If the rotor is allowed to rotate freely to return to the 'on' position, then the automatic return function is improved, but the rotor can be overtaken and lose electrical contact due to violent key movement
Solution Approach 1:
The retainer applies a preliminary linear force on the rotor in the opposite direction to the direction of linear force applied by the first push back device, creating a barrier that prevents the rotor from being overtaken beyond the predetermined angular position even during violent key movement
Solution Approach 2:
The system allows dynamic rotation of the rotor for normal operation (returning to 'on' position) while simultaneously imposing dynamic constraints through the retainer-bracket cooperation that activates only when the rotor attempts to move beyond the predetermined angular position
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 effectively prevents involuntary rotation of the rotor, maintaining stable electrical contact and preventing unintended engine stops during vehicle operation, thereby enhancing user safety and security.
Implementation Method 1
a first push back device configured to apply a linear force between the bracket and the rotor along an axis parallel to the axis of the rotation of the rotor
Data Source
AI summary
An ignition device for a motor of an automotive vehicle is provided that the device includes a rotor configured to receive a key and mounted in rotation on a bracket, the rotor including a retainer configured to retain the rotor in translation relative to the bracket, and a first push back device configured to apply a linear force between the bracket and the rotor along an axis parallel to the axis of the rotation of the rotor. The bracket and the retainer are configured to cooperate so as to inhibit the rotation of the rotor in a predetermined direction from a predetermined angular position and to allow the rotation of the rotor beyond the predetermined angular position in the predetermined direction upon preliminarily applying a force on the rotor in an opposite direction to the direction of the linear force applied by the first push back device.