Vehicle Pedal Positioning Pin Attachment
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Solution Overview
Problem
Conventional vehicle pedal devices face accuracy issues due to variations in the attachment position of the depressing force detector and load spring, leading to displacement of the detection start point and deviation of the detection load, which requires additional mechanisms for adjustment.
Innovation Solution
A vehicle pedal device design featuring a positioning pin on the depressing force detector that inserts into a hole on the pedal arm or sub lever, fixed by a load spring, ensuring accurate attachment without detection start point and load adjusting mechanisms, with the load spring positioned between the reaction force lever and the depressing force detector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional fastening devices (bolt and nut, welding) are used to attach the depressing force detector to the attachment bracket, then the attachment can be achieved, but the position accuracy of the depressing force detector deteriorates due to variation in attachment position
Solution Approach 1:
A positioning pin is introduced as an intermediary component between the depressing force detector and the attachment bracket. The positioning pin fits into a positioning hole in the attachment bracket and extends into the depressing force detector, providing precise positional reference and eliminating attachment position variation without requiring complex fastening operations
Solution Approach 2:
The load spring automatically pushes the positioning pin against the inner peripheral edge of the positioning hole, creating a self-locking mechanism that maintains accurate positioning without requiring additional adjustment mechanisms or complex assembly procedures
2Measurement precision
If adjustment mechanisms (detection start point adjusting mechanism, detection load adjusting mechanism) are added to compensate for position variation, then detection accuracy can be maintained, but the device complexity increases
Solution Approach 1:
The positioning function is extracted from the fastening device and implemented through a dedicated positioning pin and positioning hole structure. This separation of positioning and fastening functions eliminates the need for complex adjustment mechanisms while maintaining detection accuracy
Solution Approach 2:
The load spring automatically maintains the positioning pin against the positioning hole, creating a self-adjusting system that compensates for any minor variations without requiring external adjustment mechanisms. The system self-regulates to maintain accurate detection
3Ease of operation
If conventional attachment methods are used, then the structure can be assembled, but the detection start point displaces and detection load deviates from predetermined values
Solution Approach 1:
The positioning pin acts as a mediator that ensures accurate transmission of the predetermined detection load from the load spring to the depressing force detector. It maintains the correct geometric relationship between components, preventing detection start point displacement and ensuring reliable detection accuracy
Solution Approach 2:
The positioning pin and positioning hole are designed with predetermined dimensions and tolerances that establish the correct attachment position before the load spring is installed. This preliminary positioning ensures that the detection start point and detection load are correctly established from the beginning of assembly
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 design enhances the accuracy of the depressing force detector and load spring attachment, effectively restraining displacement and deviation of the detection start point and load, while reducing the number of components and adjustment complexity.
Implementation Method 1
the depressing force detector is fixed to the pedal arm or the sub lever with the positioning pin being pressed against an inner peripheral edge of the positioning pin insertion hole by a reaction force of the load spring
Data Source
AI summary
A vehicle pedal device including a transmission member that transmits an operation force applied to a pedal, a reaction force lever that is disposed on the transmission member so that the reaction force lever pivots about a predetermined axis, and that outputs the operation force transmitted to the transmission member to a brake device against a biasing force of a load spring, and a depressing force detector that is fixedly attached to a pedal arm of the pedal or to a sub lever coupled to the pedal arm and that receives a reaction force of the reaction force lever to detect the operation force applied to the pedal, the depressing force detector being configured to have a positioning pin projecting from the depressing force detector, the pedal arm of the pedal or the sub lever coupled to the pedal arm being configured to have a positioning pin insertion hole in which the positioning pin of the depressing force detector is inserted, the depressing force detector being configured to be fixed to the pedal arm or the sub lever with the positioning pin being pressed against an inner peripheral edge of the positioning pin insertion hole by a reaction force of the load spring, and the load spring being fixedly positioned between the reaction force lever and the depressing force detector.