Worm Shaft Damper Bush Assembly for Backlash and Noise Reduction
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Solution Overview
Problem
The existing motor-driven power steering systems for vehicles are complex and heavy, leading to increased manufacturing costs, noise issues due to ball bearings, and require multiple components to prevent worm shaft movement and backlash clearance.
Innovation Solution
A bearing-integrated damper bush made of steel is coupled to the worm shaft, combining multiple components into one, with a Teflon coating for reduced friction and support protrusions to prevent movement and backlash, and a lubricant system for lubrication and cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple components (worm shaft bearing, anti-rattle spring assembly, worm shaft bush, plug) are used to prevent movement and clearance of the worm shaft, then the reliability is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines multiple components (worm shaft bearing, anti-rattle spring assembly, worm shaft bush, and plug) into a single integrated bearing-integrated damper bush. This unified component maintains all necessary functions: preventing worm shaft movement, eliminating backlash clearance, providing damping, and ensuring stability, thereby reducing device complexity and manufacturing cost while preserving reliability
Solution Approach 2:
The bearing-integrated damper bush is designed as a multi-functional component that simultaneously performs multiple roles: it acts as a bearing to support the worm shaft, incorporates an anti-rattle spring assembly to prevent clearance, includes damping functionality to reduce vibrations, and provides structural containment. This multi-functionality eliminates the need for separate components while maintaining comprehensive worm shaft stability
2Reliability
If a ball bearing is used for the worm shaft bearing, then the worm shaft movement is prevented, but noise occurs
Solution Approach 1:
The patent replaces the traditional ball bearing mechanical system with a damper bush system that uses damping materials and friction-based contact. This substitution eliminates the noise generated by ball bearing operation while maintaining effective worm shaft support and stability through alternative mechanical principles involving controlled friction and energy dissipation
3Manufacturing precision
If multiple components are used to prevent worm shaft backlash clearance, then the manufacturing precision is improved, but the weight increases
Solution Approach 1:
The patent integrates multiple backlash prevention mechanisms into a single bearing-integrated damper bush component. By combining the bearing structure, anti-rattle spring assembly, and damping elements into one unified part, the patent achieves precise backlash clearance control while eliminating the cumulative weight of multiple separate components
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 solution simplifies the structure, reduces weight and cost, minimizes noise, and enhances durability by integrating components and providing effective lubrication and cooling.
Implementation Method 1
A Teflon coating for reduced friction
Implementation Method 2
a lubricant system for lubrication and cooling
Implementation Method 3
configured to prevent movement of the worm shaft and a clearance caused by backlash between the worm wheel and the worm shaft
Data Source
AI summary
A motor-driven power steering system for a vehicle is configured such that movement of the worm shaft and a clearance caused by backlash between the worm wheel and the worm shaft may be prevented using the bearing-integrated damper bush which is coupled to the end portion of the worm shaft and is made of steel, and during of rotation of the worm shaft, the lubricant is supplied between the worm shaft and the bearing-integrated damper bush to facilitate lubrication and cooling.