Accelerator Pedal Slider Design for Hysteresis
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Solution Overview
Problem
Conventional accelerator pedal devices for electronically controlled throttle systems have complex structures and increased size due to multiple independent sliders and separate spring configurations, leading to complications and size issues.
Innovation Solution
A simplified design incorporating a pedal arm, a slider that slides on the housing's inner wall, and a biasing spring that increases the pressing force against the slider, with the slider configured to receive the biasing spring on a second straight line forming an acute angle with the first line, allowing for a single hysteresis generation mechanism that reduces the number of parts and size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two independent sliders are used as the hysteresis generation mechanism, then the hysteresis function is achieved, but the number of parts increases and the structure becomes complicated
Solution Approach 1:
The patent combines two independent sliders into a single integrated slider structure. The unified slider includes both the hysteresis generation function and the return spring mounting function, eliminating the need for separate components while maintaining the required hysteresis characteristics in the accelerator pedal operation.
Solution Approach 2:
The single slider is designed to perform multiple functions simultaneously: generating hysteresis through its interaction with the pedal arm, providing a mounting point for the return spring, and guiding the pedal arm's movement. This multi-functional design reduces the overall number of parts while achieving the same technical效果.
2Reliability
If two independent sliders reciprocate linearly in the housing, then the hysteresis generation is achieved, but the housing size and device size increase
Solution Approach 1:
The patent introduces curved guide surfaces and arc-shaped reciprocation paths for the slider, replacing linear movement with curved trajectories. This allows the slider to generate hysteresis through rotational or arc-based motion, significantly reducing the linear space required in the housing while maintaining the hysteresis generation function.
3Reliability
If the first return spring and the second return spring are disposed in different regions, then the spring functions are achieved, but parts cannot be disposed together causing increased housing size
Solution Approach 1:
The patent merges the functions of two separate return springs into a single return spring that works in conjunction with the integrated slider. The unified spring is positioned to interact with the slider's multi-functional structure, allowing both return functions to be achieved in a compact arrangement without requiring separate spatial zones for each spring.
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 achieves downsizing and desired hysteresis characteristics in the depressing force while reducing the number of parts and simplifying the structure, enabling cost-effective and efficient operation.
Implementation Method 1
a biasing spring disposed between the housing and the slider so that a biasing force pressing the slider against the inner wall of the housing and the contact part is increased according to depression of the accelerator pedal
Implementation Method 2
a slider sliding on an inner wall of the housing... configured to slide on the inner wall of the housing along a predetermined curvature centered on the axis
Data Source
AI summary
This accelerator pedal device includes a pedal arm having an accelerator pedal, a housing that supports the pedal arm so as to be capable of swinging about a prescribed axis line between a rest position and a maximum push position, a slider that slides over an inner wall of the housing, a contact part formed on the pedal arm in order to exert pressing force while separably coining into contact with the slider, and an urging spring disposed between the housing and the slider so that the urging force pressing the slider against the inner wall and the contact part increases in accordance with the pushing of the accelerator pedal.