Accelerator Device Dual Contact Portion Noise Reduction
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Solution Overview
Problem
Existing accelerator devices generate impact noise when the operating member contacts the inner wall, and this noise is not effectively reduced, while also experiencing abrasion and creep issues that lead to further contact stress.
Innovation Solution
The accelerator device incorporates a first contact portion and a second contact portion, where the second contact portion is positioned at a longer distance from the rotary shaft, allowing it to engage the inner wall only after the first contact portion has deformed due to abrasion or creep, distributing the force and reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the operating member contacts the inner wall at a single contact portion, then the structure is simple, but impact noise is generated and abrasion/creep occurs
Solution Approach 1:
The contact portion is divided into a first contact portion and a second contact portion positioned at different radial distances from the rotary shaft. The first contact portion contacts the inner wall during normal operation, while the second contact portion engages when the first portion deforms beyond a predetermined volume, thereby segmenting the contact function to reduce noise and wear
Solution Approach 2:
The second contact portion is positioned in advance at a longer radial distance to serve as a backup contact point. When the first contact portion deforms excessively due to abrasion or creep, the second contact portion automatically engages to prevent direct impact noise and protect the first contact portion from further damage
2Reliability
If the first contact portion deforms due to abrasion and creep, then contact stress increases, but noise and further wear worsen
Solution Approach 1:
The second contact portion acts as an intermediary protective element. When the first contact portion deforms beyond the predetermined volume, the second contact portion engages with the inner wall to mediate the contact stress, preventing further deformation and reducing the harmful effects of noise and wear on the first contact portion
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 configuration reduces the volume of impact noise and protects the first contact portion from further abrasion and creep by distributing the force applied from the inner wall to both contact portions, thereby minimizing discomfort and extending the lifespan of the device.
Implementation Method 1
The first contact portion is configured to be deformed by a contact with an inner wall of the housing when the operating member is located at the accelerator idle position
Data Source
AI summary
An accelerator device includes a housing, a rotary shaft, and an operating member. The operating member is configured to move in an opening direction and a closing direction. The operating member includes a first contact portion arranged at a first distance from the rotary shaft and a second contact portion arranged at a second distance from the rotary shaft. When the first contact portion has an initial shape and the operating member is located at the accelerator idle position, the second contact portion is arranged at a predetermined distance from the inner wall. When the first contact portion is deformed more than a predetermined volume from the initial shape and the operating member is located at the accelerator idle position, the second contact portion is in contact with the inner wall.