Leading-Edge Spindle Steering for Tension-Loaded Off-Road Rods
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Solution Overview
Problem
Off-road vehicles face challenges in improving mechanical strength and performance of drivetrains and suspension systems while reducing mechanical complexity, particularly when traversing rough terrain.
Innovation Solution
A leading-edge steering system for off-road vehicles, featuring a spindle assembly with rod-end joints and a steering rod-end joint that allows vertical and horizontal rotational motion, reducing leverage on the steering rod and eliminating bump steer, utilizing Heim joints or bushing joints to couple suspension arms with the spindle assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional trailing-edge steering system is used, then the structure is simpler, but the steering rod is subjected to higher compressive loads and greater leverage during rough terrain traversal
Solution Approach 1:
The patent inverts the conventional steering system configuration by moving the steering rod attachment point from the trailing edge to the leading edge of the spindle assembly. This inversion changes the force direction from compression to tension, allowing the steering rod to withstand greater loads during rough terrain traversal while maintaining similar structural complexity
2Reliability
If traditional suspension arm connections are used, then the design is more conventional, but the system experiences higher mechanical stress and potential failure points on rough terrain
Solution Approach 1:
The patent changes the connection mechanism from traditional rigid or simple pinned connections to rod-end joints (Heim joints or bushing joints). This parameter change allows for controlled rotational movement while maintaining strong structural connection, reducing stress concentrations and improving reliability during rough terrain operation
Data Source
AI summary
A leading-edge steering system is provided for a front suspension of an off-road vehicle. The leading-edge steering system is comprised of a spindle assembly that supports a drive axle assembly to conduct torque from a transaxle to a front wheel. A first rod-end joint pivotally couples an upper suspension arm and the spindle assembly, and a second rod-end joint pivotally couples a lower suspension arm and the spindle assembly. A steering rod-end joint pivotally couples a first end of a steering rod with a leading-edge portion of the spindle assembly. A steering gear is coupled with a second end of the steering rod and configured to move the steering rod, such that the spindle assembly rotates with respect to the upper and lower suspension arms. The leading-edge portion is configured to exert primarily tensile forces on the steering rod during travel over rough terrain.