Rear Steer Knuckle Layout for Elevated Tie Rod Protection
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Solution Overview
Problem
Current off-road vehicles face issues with inefficient front suspension systems that fail to leverage shock absorber spring rates, require stiffer and heavier components, lack adequate stability for various tire sizes, and have vulnerable tie rods and winch assemblies that are difficult to maintain and mount, leading to increased costs and structural weaknesses.
Innovation Solution
A steering and suspension system with a knuckle design that elevates the tie rod to match the upper control arm elevation, incorporates a support webbing for structural integrity, and uses universal half shafts with identical dimensions for improved stability and reduced part complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tie rod is positioned at a lower elevation in current designs, then the steering linkage is simpler, but the tie rod becomes vulnerable to damage from oncoming debris and limits space for other components
Solution Approach 1:
The tie rod is repositioned from a low, vulnerable position to an elevated position near the upper control arm, utilizing the vertical dimension to achieve protection. The connector arm extends upward and forward from the knuckle to connect the tie rod at this elevated location, effectively using spatial reconfiguration to resolve the vulnerability issue.
Solution Approach 2:
The connector arm is designed as a separate, multi-segment component that extends from the knuckle to connect the tie rod. This segmented structure allows the tie rod to be positioned independently at an elevated, protected location while maintaining steering functionality, separating the tie rod positioning function from the main knuckle structure.
2Strength
If shock absorbers are positioned at a shallow orientation angle, then the suspension geometry is simpler, but leverage on the spring is decreased requiring stiffer and heavier shock absorbers
Solution Approach 1:
The shock absorber orientation angle is changed from a shallow angle to a steeper angle, optimizing the leverage on the spring. This parameter change allows the shock absorber to operate more efficiently, reducing the required shock absorber stiffness and weight while maintaining suspension performance.
3Ease of operation
If winches are integrated with the front bumper in current designs, then the winch is protected, but the winch cannot be accessed for maintenance or replacement without removing numerous components
Solution Approach 1:
The winch assembly is separated from the front bumper assembly into an independent, removable unit. This segmentation allows the winch to be easily accessed, removed, and replaced without disassembling the front bumper or other integrated components, while still providing protection when mounted.
Solution Approach 2:
The winch assembly is designed with dynamic mounting capabilities, allowing it to be quickly installed and removed. This dynamic configuration enables easy access for maintenance while maintaining protection during operation, adapting the system between protected and accessible states as needed.
4Adaptability or versatility
If differently dimensioned half shafts are used in front and rear drivetrains, then the drivetrain can be optimized for specific applications, but the number of parts increases and strength uniformity is reduced
Solution Approach 1:
A universal half shaft design is implemented that can serve both front and rear drivetrain applications. This universal component maintains optimized performance characteristics while reducing the total number of different part types, allowing the same half shaft design to be used across different drivetrain positions.
Solution Approach 2:
The half shafts are designed with uniform dimensions and properties across all positions in the drivetrain. This homogeneity reduces the variety of parts needed, simplifies inventory and maintenance, while still achieving application-specific optimization through proper selection and configuration of the universal design.
Data Source
AI summary
A steering and suspension system for an off-road vehicle includes a steering rack assembly and a tie rod, the inboard end of the tie rod coupled to the steering rack assembly. The steering and suspension system includes a knuckle having a top side defining an upper control arm connector arm and an aft side defining a tie rod connector arm, the tie rod connector arm having a distal end coupled to the outboard end of the tie rod. The steering and suspension system also includes an upper control arm having an outboard end coupled to the upper control arm connector arm. The distal end of the tie rod connector arm is positioned such that the tie rod has substantially the same elevation as the upper control arm.