Brake Pedal Reaction Mechanism With Nested Guides Against Piston Tilting
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Solution Overview
Problem
Existing pedal simulators face challenges in maintaining a large L/D ratio for the guide length and diameter of the piston, leading to potential tilting and variations in the reaction force against the depression force applied to the brake pedal.
Innovation Solution
A pedal device with a reaction force generation mechanism that includes at least one resilient member, a first holder with an outer guide portion, and a second holder with an inner guide portion, allowing for a large L/D ratio and minimizing tilting, thereby ensuring a consistent reaction force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the guide length L is increased to maintain a large L/D ratio, then the piston tilting is reduced, but the device complexity and space requirements increase
Solution Approach 1:
The patent applies nesting by placing the inner guide portion inside the outer guide portion, creating a compact dual-guide structure. The inner guide portion is inserted into the outer guide portion, allowing both guides to occupy the same spatial envelope, thereby reducing overall device size while maintaining effective guide length for preventing piston tilting.
Solution Approach 2:
The patent transitions from a single-dimensional guide (single guide portion) to a two-dimensional guide structure (concentric inner and outer guide portions). This dimensional expansion allows the guide structure to provide stabilization in multiple directions simultaneously, effectively preventing piston tilting without requiring excessive length in a single dimension.
2Stability of the object's composition
If the piston diameter D is decreased to increase L/D ratio, then the reaction force consistency improves, but the force transmission capability deteriorates
Solution Approach 1:
The patent segments the guide function into two separate components: the outer guide portion and the inner guide portion. This segmentation allows each guide portion to work independently in stabilizing the piston, providing enhanced guidance and reaction force consistency without requiring a reduction in piston diameter, thereby preserving force transmission capability.
Solution Approach 2:
The inner guide portion acts as an intermediary element between the piston and the outer guide portion. It provides additional guidance and support, ensuring reaction force consistency while allowing the piston to maintain its diameter for adequate force transmission. The intermediary structure mediates between the conflicting requirements of consistency and force capability.
3Device complexity
If a single guide portion is used to simplify the structure, then the device complexity is reduced, but the piston tilting control becomes insufficient
Solution Approach 1:
The patent uses nesting to combine two guide portions in a space-efficient manner. The inner guide portion is placed within the outer guide portion, creating a compact dual-guide system that provides superior piston tilting control without proportionally increasing device complexity or space requirements.
Solution Approach 2:
The dual-guide structure serves multiple functions simultaneously: the outer guide portion provides primary guidance and support, while the inner guide portion provides secondary guidance and additional stabilization. This multi-functionality allows the guide system to effectively control piston tilting while maintaining a relatively compact and integrated structure.
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 configuration allows for a significant increase in the L/D ratio, reducing the likelihood of tilting and ensuring a consistent reaction force is generated against the depression force, enhancing the pedal device's performance.
Implementation Method 1
at least one resilient member that is resiliently deformable in one direction
Data Source
AI summary
A pedal device includes: a pedal that is depressed by a driver; and a reaction force generation mechanism. The reaction force generation mechanism generates a reaction force against a depression force applied from the driver to the pedal. The reaction force generation mechanism includes at least one resilient member, a first holder and a second holder. The first holder contacts the at least one resilient member from one side where the pedal is placed in one direction. The second holder contacts the at least one resilient member from another side that is opposite to the one side. One holder among the first holder and the second holder includes an outer guide portion, and another holder among the first holder and the second holder includes an inner guide portion that is fitted into the outer guide portion and is movable relative to the outer guide portion in the one direction.