Motor Driven Power Steering Worm Shaft Vibration Damping
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Solution Overview
Problem
Motor driven power steering systems experience metallic noises and vibrations due to gaps between gear teeth, leading to floating issues and reduced ride comfort.
Innovation Solution
A motor driven power steering system that incorporates a bearing bush with a bearing guide and a damper made of elastically deformable material, such as rubber, to enclose and absorb vibrations on the worm shaft, preventing floating and noise generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a bearing is installed on the worm shaft to support rotation, then the worm shaft can rotate smoothly, but floating and metallic noises occur due to gaps between gear teeth
Solution Approach 1:
The bearing guide encloses the bearing, and the damper encloses the bearing guide, creating nested structures that progressively contain and isolate the bearing assembly. This nesting approach allows the bearing to function while preventing floating and reducing noise transmission to the housing.
Solution Approach 2:
The bearing guide acts as an intermediary structure between the bearing and the housing, while the damper serves as a mediator that absorbs vibrations and prevents metallic noise transmission. These intermediary elements isolate the bearing assembly from direct contact with the housing, eliminating the floating issue.
2Object-affected harmful factors
If separate components are used for bearing guide and damper to reduce vibrations, then vibration absorption is improved, but assembly complexity and manufacturing cost increase
Solution Approach 1:
The bearing guide and damper are merged into a single integrally formed component through injection molding. This combination maintains the vibration absorption functionality of the damper while eliminating the need for separate assembly steps, thereby reducing assembly complexity and manufacturing cost.
Solution Approach 2:
The integrally formed bearing guide-damper component serves multiple functions simultaneously: it guides the bearing, absorbs vibrations, and prevents floating. This multi-functionality eliminates the need for separate components and simplifies the overall assembly process.
3Reliability
If multiple separate parts are used for bearing support structure, then functional requirements are met, but manufacturing cost and assembly time increase
Solution Approach 1:
Multiple functional elements (bearing guide, damper, and support structure) are merged into a single integrally formed component. This maintains all necessary bearing support functionalities while eliminating multiple assembly steps, thereby improving productivity and assembly efficiency.
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 system effectively absorbs shocks and reduces noise, enhancing ride comfort by preventing floating and metallic noises, while simplifying assembly and reducing costs through integral injection molding.
Implementation Method 1
the damper includes elastically deformable material to be able to absorb vibrations from the worm shaft
Data Source
AI summary
A motor driven power steering system includes a worm shaft, a bearing installed on the worm shaft, and a bearing bush enclosing the bearing. The bearing bush includes a bearing guide enclosing the bearing and a damper which is mounted on an outer side surface of the bearing guide and absorbs vibrations of the worm shaft. The bearing guide and the damper are integrally formed by injection molding.