Rack-Driven Power Steering Resilient Support Member
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Solution Overview
Problem
Existing rack-driven auxiliary power steering systems experience idling due to slip between the ball nut and nut pulley, leading to reduced power transmission efficiency, noise, and vibrations, which negatively impact the steering experience.
Innovation Solution
Incorporation of a resilient support member between the ball nut and nut pulley, featuring axial grooves that correspond to each other, to prevent idling and absorb vibrations and noise, enhancing durability and power transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a belt type power transmission unit is used to transmit auxiliary steering power, then power transmission is achieved, but slip occurs between the ball nut and nut pulley causing idling and reduced efficiency
Solution Approach 1:
A resilient support member is introduced as an intermediary element between the ball nut and nut pulley. This member includes a resilient body that elastically supports the ball nut, preventing direct rigid contact and eliminating idling caused by slip between the ball nut and nut pulley during power transmission
Solution Approach 2:
The resilient support member changes the mechanical parameters of the connection between ball nut and nut pulley by introducing elasticity. The resilient body deforms elastically under load, maintaining continuous contact and preventing idling while absorbing vibrations and noise
2Ease of operation
If the rack bar is slid while the ball nut and nut pulley rotate, then steering motion is achieved, but vibrations and noise are generated and transferred through the components
Solution Approach 1:
The resilient support member acts as a mediator between the rotating ball nut and the sliding rack bar assembly. The resilient body absorbs and isolates vibrations and noise generated during operation, preventing their transmission through the mechanical components to the driver
Solution Approach 2:
The resilient support member utilizes elastic deformation (a reversible phase transition in material state) to absorb vibration energy. The resilient body dynamically deforms and recovers, converting mechanical vibration energy into elastic potential energy and dissipating it, thereby reducing noise and vibration transmission
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 solution effectively minimizes vibrations and noise, improving power transmission efficiency and providing a more comfortable steering experience by preventing idling between the ball nut and nut pulley, thus enhancing the overall performance of the steering system.
Implementation Method 1
a resilient support member coupled between the ball nut and the nut pulley
Data Source
AI summary
A rack-driven auxiliary power steering apparatus prevents a ball nut and a nut pulley from idling due to a slip thereof and increases durability when the drive belt is operated by driving of a motor, and minimizes vibrations and noise transferred through the rack bar, the ball nut, and the nut pulley when the rack bar is slid while the nut pulley and the ball nut are rotating, thereby providing a comfortable steering feeling to the driver.