Dual Bushing Steering Rack Y-Axis Support
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Rack and pinion steering systems in high-performance off-road vehicles face limited support along the Y axis and excessive load on the Z axis, leading to reduced rack life due to inadequate support mechanisms.
Innovation Solution
A rack and pinion steering assembly with a pinion assembly, steering rack, pressure-applying assembly, rack and pinion housing, and dual support bushings to provide comprehensive support along the Y axis, maintaining engagement between the pinion gear and steering rack through a spring-loaded pressure-applying assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single spring-loaded support is used for the steering rack, then the assembly can be simpler, but the support along the Y axis is limited and Z axis loads reduce rack life
Solution Approach 1:
The single support mechanism is segmented into two separate support bushings positioned at different locations along the steering rack. This segmentation provides distributed support along the Y axis while reducing concentrated Z axis loads on any single point, thereby improving reliability without significantly increasing overall system complexity.
Solution Approach 2:
The support system transitions from a single-point support to a multi-point distributed support system along the Y axis dimension. By adding the second bushing at a different position, the system creates a linear distribution of support points that enhances stability and load distribution beyond what a single support could provide.
2Duration of action of stationary object
If the steering rack is supported more robustly along the Y axis, then rack life increases, but the device complexity increases with additional bushings
Solution Approach 1:
The support bushings act as intermediary elements between the steering rack and the housing. These intermediaries distribute the mechanical loads and provide cushioning, thereby extending the rack's service life. The bushings are standard mechanical components that, while adding to component count, use proven designs to minimize overall system complexity.
3Reliability
If dual support bushings are added to provide complete Y axis support, then the steering rack durability improves, but the manufacturing and assembly complexity increases
Solution Approach 1:
The support bushings serve multiple functions: they provide Y axis support, distribute Z axis loads, accommodate thermal expansion, and facilitate easy installation through standard mounting features. This multi-functionality justifies the additional components by consolidating multiple protective and supportive roles into standardized parts that simplify rather than complicate manufacturing.
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
Enhances the durability and life of the steering assembly by providing complete support along the Y axis, maintaining gear preload within specifications and increasing gear lift, thus addressing the limitations of prior art assemblies.
Implementation Method 1
a pressure-applying assembly adapted to apply a force on the steering rack effective to engage the steering rack with the pinion gear, the pressure-applying assembly comprising a cup and a spring
Data Source
AI summary
A rack and pinion steering assembly includes: a pinion shaft driving a pinion gear; a steering rack having a toothed, engageable portion adapted to engage with the pinion gear, and a pressure-receiving portion opposite the engageable portion to apply a force on the steering rack to engage the steering rack with the pinion gear; a rack and pinion housing and associated steering tube; a first support bushing to support the steering rack in its housing on a first side of the assembly; and a second support bushing effective to support the steering rack on a second side of the assembly, with the second side of the assembly being opposite the first side of the assembly, relative to the pinion gear.