Rigid Dual-Housing Pedal Assembly for Stable Reaction Force
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Solution Overview
Problem
Conventional pedal devices face challenges in generating stable reaction forces due to deformation of the housing when subjected to high loads, particularly in brake pedal applications, which can lead to unstable pedaling force characteristics and increased weight.
Innovation Solution
The pedal device incorporates a first housing made of resin and a second housing made of a rigid material with a higher Young's modulus, supporting the reaction force generation mechanism on the opposite side of the pedal pad, thereby minimizing deformation and stabilizing pedaling force characteristics while reducing weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a single housing supports the reaction force generation mechanism, then the structure is simple, but the housing deforms under high load causing unstable pedaling force characteristics
Solution Approach 1:
The housing is divided into a first housing and a second housing, with the second housing specifically supporting the reaction force generation mechanism. This segmentation allows the second housing to be optimized for load-bearing while the first housing provides overall protection, resolving the contradiction between structural simplicity and stability under load.
Solution Approach 2:
The second housing is designed with locally higher rigidity (using material with higher Young's modulus) specifically at the portion supporting the reaction force generation mechanism. This local quality enhancement provides the necessary stability for pedaling force characteristics without requiring the entire housing structure to be complex and heavy.
2Stability of the object's composition
If a rigid material with high Young's modulus is used for the second housing, then deformation is minimized and reaction force stability is improved, but weight increases
Solution Approach 1:
Only the second housing, which requires high rigidity for supporting the reaction force generation mechanism, is made of material with higher Young's modulus. The first housing can use lighter materials, thus achieving reaction force stability without excessive weight increase of the entire pedal device.
Solution Approach 2:
The pedal device uses different materials for the first and second housings, with the second housing using a rigid material with higher Young's modulus. This composite material approach allows optimization of each component's weight-strength ratio, achieving necessary stability while controlling overall weight.
3Weight of moving object
If the housing is designed to be lightweight, then the pedal device weight is reduced, but the housing deforms under high load
Solution Approach 1:
The second housing has locally enhanced rigidity with higher Young's modulus material specifically where it supports the reaction force generation mechanism. This allows the housing to maintain lightweight overall design while having sufficient strength and rigidity where high loads are applied.
Solution Approach 2:
By dividing the housing into two parts with different material properties, the design achieves lightweight construction in the first housing while maintaining high strength in the critical load-bearing second housing, thus resolving the weight-strength contradiction.
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 ensures stable reaction force generation with reduced weight by using a rigid second housing to support the reaction force mechanism, maintaining pedaling force stability and minimizing weight increase, while also allowing for easy assembly and protection of the mechanism from foreign matter.
Implementation Method 1
The reaction force generation mechanism has an elastic member configured to generate a reaction force against a driver's stepping force applied to the pedal pad
Implementation Method 2
The second housing is made of a rigid portion having a Young's modulus greater than that of the first housing or configured to have the rigid portion at least in part. In addition, the second housing is configured to support a portion of the reaction force generation mechanism on one side opposite to the pedal pad by the rigid portion
Data Source
AI summary
A pedal pad in an organ-type pedal device swings about a predetermined axis when stepped on by a driver's foot. A sensor unit outputs a signal corresponding to a swing angle of the pedal pad. A reaction force generation mechanism generates a reaction force against a driver's stepping force applied to the pedal pad. A first housing holds or covers at least one of a rotation shaft provided at the axis of the swinging of the pedal pad, the sensor unit, and the reaction force generation mechanism. A second housing is made of a rigid portion having a Young's modulus greater than that of the first housing or has the rigid portion at least in part. The second housing is configured to support a portion of the reaction force generation mechanism on one side opposite to the pedal pad by the rigid portion.