Vehicle Brake Pedal Collision Rack Disengagement Mechanism
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Solution Overview
Problem
In vehicle collisions, the brake pedal can be pushed back towards the driver, causing injury due to the transmission of impact forces, and existing solutions are prone to wear and tear, leading to accidental disengagement or damage, potentially causing further harm.
Innovation Solution
A brake pedal apparatus with a rotatable pedal arm and collision rack system, where the collision rack blocks and then releases the pedal arm's axis upon collision, allowing it to disengage from the fixing bracket, reducing the risk of injury by moving the pedal arm away from the driver's leg.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the brake pedal is rigidly connected to the fixing bracket, then the brake pedal maintains structural stability during normal operation, but the brake pedal transmits collision impact forces to the driver's foot causing injury
Solution Approach 1:
The brake pedal connection is transformed from a fixed rigid structure to a dynamic system with two-stage mobility: during normal operation the pedal arm is constrained by the collision rack to maintain stability, while during collision the pedal arm can rotate about the first axis to move away from the driver's foot, converting the static connection into a conditional dynamic connection that adapts to different operational states
Solution Approach 2:
The collision rack acts as an intermediary mechanism between the pedal arm and the fixing bracket. It normally blocks the first axis to prevent pedal movement, but upon collision with the collision bracket, it releases the blockage allowing the pedal arm to rotate and move away from the driver, thus mediating between structural stability and impact force transmission prevention
2Object-affected harmful factors
If the brake pedal is designed to disengage during collision, then injury risk is reduced, but the brake pedal may accidentally disengage due to wear and tear even without collision
Solution Approach 1:
The collision rack serves as a controlled intermediary that mediates between the pedal arm and fixing bracket. It requires a specific trigger condition (collision with the collision bracket) to release the pedal arm, preventing accidental disengagement while enabling controlled disengagement during actual collisions. The intermediary mechanism ensures that disengagement only occurs when the collision bracket activates it
Solution Approach 2:
The collision rack preliminarily blocks the first axis of the pedal arm to prevent unwanted movement and accidental disengagement. This preliminary constraint remains in place until a collision occurs, at which point the collision bracket triggers the release mechanism. The preliminary anti-action prevents premature disengagement while preparing the system for controlled disengagement when needed
3Loss of time
If the collision rack is positioned close to the collision bracket, then the response time during collision is reduced, but the system complexity increases
Solution Approach 1:
The collision rack is designed to rotate about a second axis that is different from the first axis of the pedal arm. This dimensional change in rotation axis allows the collision rack to efficiently convert collision force into pedal arm movement, reducing response time while maintaining a relatively simple structural configuration. The dimensional change enables more effective force transmission geometry
Data Source
AI summary
A brake pedal apparatus for a vehicle is provided. The brake pedal apparatus includes a fixing bracket fixedly installed in a vehicle, a pedal arm coupled to the fixing bracket to be rotatable about a first axis, and a collision rack coupled to the fixing bracket to be rotatable about a second axis which is different from the first axis. The collision rack is configured to rotate upon a collision with a collision bracket. The fixing bracket supports the pedal arm to allow the pedal arm to be movable in a predetermined direction. The collision rack blocks the movement of the first axis of the pedal arm, and upon the collision with the collision bracket, the collision rack allows the pedal arm to be disengaged from the fixing bracket, thereby reducing the risk of injuring the driver.