Steering Pinion Elastic Preload for Lower NVH
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Solution Overview
Problem
Existing vehicle steering systems experience noise, vibration, and harshness (NVH) due to axial movements of the pinion relative to the housing, which are not effectively dampened.
Innovation Solution
Incorporation of an elastic element compressed in a recess between the pinion and the shaft, applying an axial force to the pinion that dampens its axial movements relative to the housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional steering system design is used, then the structure is simple, but axial movements of the pinion cause noise, vibration, and harshness
Solution Approach 1:
An elastic element is introduced as an intermediary component between the pinion and the housing. This elastic element absorbs axial movements of the pinion through its compliance, acting as a mediator that isolates the source of vibration from the housing, thereby reducing NVH without requiring fundamental changes to the steering system architecture
Solution Approach 2:
The elastic element is pre-installed in a compressed state within a recess between the pinion and the housing. This beforehand cushioning arrangement ensures that the pinion's axial movements are dampened from the outset, preventing noise and vibration before they can propagate through the housing
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 element effectively reduces NVH in the steering system by dampening axial movements of the pinion, without the need to increase the bearings' preload or torque-to-rotate value.
Implementation Method 1
An elastic element compressed in the recess between the pinion and the shaft. The elastic element applies an axial force to the pinion that dampens axial movements of the pinion relative to the housing.
Implementation Method 2
The elastic element applies an axial force to the pinion that dampens axial movements of the pinion relative to the housing.
Data Source
AI summary
A steering system for use in turning steerable vehicle wheels includes a steering wheel and a housing. A pinion is in the housing and connected to the steering wheel via a shaft such that rotation of the steering wheel urges the pinion to rotate about an axis relative to the housing. The pinion has a recess. An elastic element is compressed in the recess between the pinion and the shaft. The elastic element applies an axial force to the pinion that dampens axial movements of the pinion relative to the housing.