Rack Housing Resonance Reduction Ribs for Steering Vibration Control
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Solution Overview
Problem
Vehicle steering systems experience strong vibration and noise due to excitation forces interacting with resonance components in the transmission path, leading to undesirable vibrations and noise transmission.
Innovation Solution
A vehicle steering apparatus is designed with modified rack housing sizes and shapes, incorporating ribs to reduce resonance, specifically featuring resonance reduction ribs around mounts and bearing outer ring inserts to minimize vibration and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If excitation forces are transmitted through the steering system components, then the steering system can transmit steering force to the wheels, but strong vibration and noise are generated due to resonance
Solution Approach 1:
The patent applies resonance reduction ribs to the rack housing to change its structural parameters. These ribs modify the natural frequencies and mode shapes of the rack housing, thereby avoiding resonance conditions when excitation forces are transmitted during steering operations. This allows the steering force to be transmitted effectively while minimizing vibration and noise generation.
2Ease of manufacture
If the rack housing structure is simplified for ease of manufacture, then manufacturing cost and complexity are reduced, but resonance vibration and noise increase
Solution Approach 1:
Instead of complicating the entire rack housing structure, the patent applies resonance reduction ribs only at specific critical locations where resonance occurs. These ribs are strategically positioned on the rack housing to target specific resonant modes, providing effective vibration and noise reduction while maintaining the overall simplicity and ease of manufacture of the rack housing.
3Object-generated harmful factors
If the size and shape of rack housing parts are modified to reduce resonance, then vibration and noise are minimized, but manufacturing complexity increases
Solution Approach 1:
The patent divides the rack housing into distinct sections and applies resonance reduction ribs as separate, modular features. Rather than redesigning the entire rack housing as a complex monolithic structure, the ribs are added as segmented elements at specific locations, each targeting particular resonant frequencies. This segmentation approach reduces overall vibration and noise while keeping the manufacturing process relatively simple and modular.
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 reduces resonant frequencies and minimizes vibration and noise transmission by strategically applying ribs to key components of the rack housing, enhancing the operational stability and quietness of the steering system.
Implementation Method 1
a vehicle steering apparatus capable of minimizing generation of vibration and noise by changing a size and shape of a part of a rack housing and applying ribs to reduce resonance
Data Source
AI summary
Disclosed herein is a vehicle steering apparatus that includes a main rack housing configured to surround a rack bar, a reduction-unit-side rack housing extending to one side of the main rack housing and connected to a reduction unit for reducing motor power, and an input-unit-side rack housing extending to the other side of the main rack housing and connected to a steering input unit having a pinion gear installed thereto, wherein the reduction-unit-side rack housing is formed with a first resonance reduction rib for reducing resonance.