Rear Stabilizer Layout for Off-Road Vehicle Protection
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Solution Overview
Problem
Conventional off-road vehicles face challenges in protecting the rear stabilizer from external forces due to its exposure, particularly when the engine obstructs the path for the torsion bar, necessitating increased vehicle dimensions to reposition it safely.
Innovation Solution
The vehicle design positions the rear stabilizer to overlap the engine in a plan view, with a portion passing in front of the shock absorbers and below the engine, allowing it to be spaced away from external forces without requiring increased fore-aft dimensions, and incorporates a torsion bar that twists and is supported by the frame, minimizing clearance with the engine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the torsion bar is disposed in front of the pair of shock absorbers to protect it from external forces, then the rear stabilizer function is improved, but the vehicle's fore-aft dimension must be increased
Solution Approach 1:
The torsion bar is repositioned from a longitudinal arrangement (front to back) to a transverse arrangement (side to side) by passing it through the engine assembly area. This dimensional change allows the torsion bar to be protected from external forces while maintaining compact vehicle dimensions, as it now utilizes the width dimension rather than extending the fore-aft length.
Solution Approach 2:
The torsion bar is nested within the space occupied by the engine and transmission assembly. By routing the torsion bar through the engine area and positioning it to overlap with the engine in plan view, the design utilizes existing structural space to protect the torsion bar without requiring additional external space or increasing vehicle dimensions.
2Reliability
If the engine and pair of shock absorbers are spaced apart to allow torsion bar routing, then the rear stabilizer protection is improved, but the vehicle layout complexity increases
Solution Approach 1:
The torsion bar routing is merged with the existing engine and transmission assembly structure. Rather than creating a separate protection mechanism or spacing out components, the design integrates the torsion bar path with the engine bay area, using the engine and transmission housing to naturally protect the torsion bar while maintaining a unified, compact vehicle layout.
3Device complexity
If the torsion bar passes behind the pair of shock absorbers, then the suspension assembly structure is simplified, but the rear stabilizer is exposed to external forces from the rear
Solution Approach 1:
Instead of positioning the torsion bar behind the shock absorbers (conventional arrangement), the design inverts the sequence by routing the torsion bar through the engine area first, then connecting it to the suspension assembly. This reversal allows the engine and transmission assembly to act as a protective barrier between external forces and the torsion bar.
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
This configuration effectively reduces exposure of the rear stabilizer to external forces from various directions, maintains vehicle compactness, and simplifies the frame structure by eliminating the need for additional support elements, enhancing protection and layout efficiency.
Implementation Method 1
a torsion bar serving as a rear stabilizer... The pair of lower alignment arms are connected to each other by a torsion bar... An external force applied to the torsion bar can reduce the rear stabilizer function of the torsion bar
Data Source
AI summary
A vehicle includes a pair of rear wheels, a frame portion, a roll-over protection cage supported by the frame portion, a pair of suspension assemblies at a rear region of the frame portion to suspend the pair of rear wheels, an engine supported by the frame portion, with at least a portion of the engine being at a more rearward position than the roll-over protection cage, and a rear stabilizer connecting the pair of suspension assemblies to each other. Each of the pair of suspension assemblies includes an arm portion supported pivotably by the frame portion, and a shock absorber which connects the arm portion and the frame portion to each other. The rear stabilizer overlaps the engine in a plan view, passing in front of the pair of shock absorbers and below the engine.