Steering Actuator Rod Holder Assembly for Vibration-Stable Angle Sensing

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Solution Overview

Problem

Conventional vehicle steering devices face challenges in accurately measuring steering angle changes due to mounting structure issues and suffer from reduced accuracy under road impact and vibration, leading to increased noise and vibration.

Innovation Solution

A vehicle steering device featuring an actuator rod with a holder assembly and elastic member, supported within a rod housing, which allows precise axial displacement measurement and minimizes noise and vibration through a magnet and sensor assembly, maintaining measurement accuracy even under road impact.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a conventional mounting structure is used for the magnet and sensor, then the device complexity is reduced, but the measurement precision of axial displacement deteriorates

Engineering Contradiction:

Improvemeasurement precision of axial displacementVSAvoiddevice complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The holder assembly is divided into a first holder and a second holder that are axially separated and independently mounted on opposite sides of the actuator rod. This segmentation allows each holder to be precisely positioned and supported, improving the measurement precision of axial displacement while distributing the structural complexity across separate components.

Inventive Principle:

Principle #1Segmentation

2Manufacturing precision

If rigid support structure is used for the holder assembly, then the manufacturing precision is improved, but the noise and vibration increase under road impact

Engineering Contradiction:

Improvemanufacturing precision of holder assemblyVSAvoidnoise and vibration under impact

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The elastic members are pre-installed between the first and second holders to provide cushioning support. This beforehand cushioning allows the holder assembly to absorb road impacts and vibrations before they can affect the magnet and sensor, reducing noise and vibration while maintaining the precise relative positioning achieved through manufacturing.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Strength

If the first holder and second holder are rigidly connected, then the structural strength is improved, but the measurement accuracy of steering angle deteriorates due to vibration

Engineering Contradiction:

Improvestructural strength of holder assemblyVSAvoidmeasurement precision of steering angle

Core Design Contradiction:

StrengthVSMeasurement precision

Solution Approach 1:

The elastic members act as flexible elements connecting the first and second holders. These flexible connections provide the necessary structural strength to support the assembly while allowing relative movement that absorbs vibrations, preventing vibration transmission to the magnet and sensor and thereby maintaining steering angle measurement precision.

Inventive Principle:

Principle #30Flexible shells and thin films

4Ease of manufacture

If conventional sensor mounting is used, then the ease of manufacture is improved, but the reliability under impact and vibration deteriorates

Engineering Contradiction:

Improveease of manufacture of holder assemblyVSAvoidreliability under impact and vibration

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The holder assembly is segmented into separately manufacturable first and second holders that can be independently produced and then assembled with elastic members. This segmentation maintains ease of manufacture through standardized components while improving reliability by allowing the elastic members to absorb impacts and vibrations that would otherwise damage a rigid conventional mounting structure.

Inventive Principle:

Principle #1Segmentation

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

Enhances steering angle measurement accuracy and reduces noise and vibration, ensuring durability and precise control during vehicle operation.

Implementation Method 1

an elastic member coupled between the cut surfaces of the first holder and the second holder to support the first holder and the second holder toward the rod housing

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS20240208566A1Vehicle steering device

Publication Date: 2024.06.27 HL MANDO CORP

AI summary

The present embodiments provide a vehicle steering device comprising an actuator rod linearly reciprocating in an axial direction, a holder assembly having a first holder and a second holder separated by being axially cut and disposed with their respective cut surfaces facing each other and coupled to the actuator rod to linearly reciprocate in the axial direction, a rod housing having the actuator rod embedded therein and having an inner surface where two opposite surfaces of the holder assembly are supported, and an elastic member coupled between the cut surfaces of the first holder and the second holder to support the first holder and the second holder toward the rod housing.