Steering Assist Apparatus Vibration Isolation via Elastic Mounting
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Solution Overview
Problem
Vibration from the vehicle body is transmitted to the torque sensor in motor-driven steering assist apparatuses, leading to improper operation and unstable steering assist performance.
Innovation Solution
Incorporating elastic members between the housing attaching portion and the vehicle body side attaching stay to absorb and inhibit the transmission of vibrations to the torque sensor, ensuring stable steering assist performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the attaching boss is directly fixed to the vehicle body side attaching stay, then the structure is simple and rigid, but vibration from the road surface and engine is transmitted to the torque sensor, causing improper operation
Solution Approach 1:
An elastic member is introduced as an intermediary element between the housing attaching portion and the vehicle body side attaching stay. This elastic member acts as a vibration isolation mediator that absorbs and dampens vibrations from the road surface and engine, preventing them from being transmitted to the torque sensor while still maintaining the structural connection.
Solution Approach 2:
The elastic member provides beforehand cushioning by being pre-installed in the attachment path between the housing and vehicle body. This cushioning element is positioned in advance to absorb and attenuate vibration energy before it can reach the torque sensor, protecting the sensitive component from harmful vibrations during vehicle operation.
2Ease of manufacture
If rigid attachment is used between housing and vehicle body, then assembly is simple and positioning is accurate, but vibration transmission causes improper torque sensor operation
Solution Approach 1:
The elastic member serves as a mediator that maintains the simple attachment structure while filtering out vibrations. It allows the attachment to remain straightforward in terms of assembly steps and positioning, but adds the functional capability of vibration isolation to protect torque detection accuracy.
3Volume of moving object
If the torque sensor is positioned close to the input shaft for compact design, then the apparatus size is reduced, but vibration from the vehicle body more easily affects the torque sensor operation
Solution Approach 1:
The elastic member acts as a protective intermediary between the vehicle body vibration source and the torque sensor. This allows the torque sensor to be positioned close to the input shaft for compact design while the elastic member blocks the transmission path of harmful vibrations, maintaining both compactness and sensor reliability.
Solution Approach 2:
The elastic member converts the potentially harmful vibration energy into beneficial damping and isolation effects. By absorbing and dissipating vibration energy, it protects the torque sensor from improper operation while allowing the compact design to be maintained.
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 elastic members effectively absorb vehicle body vibrations, preventing improper torque sensor operation and securing stable steering assist performance by reducing rotational play and maintaining accurate torque detection.
Implementation Method 1
An elastic member is interposed between an attaching portion provided in the housing and a vehicle body side attaching stay
Implementation Method 2
An elastic member is interposed between an attaching portion provided in the housing and a vehicle body side attaching stay
Data Source
AI summary
A motor-driven steering assist apparatus is structured such that a single unit body covered by housings has an input shaft, an output shaft, a torque sensor, an electric motor and a gear train built-in, and elastic members are interposed between an attaching portion provided in the housing and a vehicle body side attaching stay.