Side-by-Side Off-Road Vehicle Layout for Clearance and Stability
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Solution Overview
Problem
Side-by-side recreational off-highway vehicles face challenges in accessing harsh off-road terrain due to limitations in vehicle width, suspension, turning radius, undercarriage clearance, wheelbase, center of gravity, and power distribution, which affect occupant ride characteristics, reliability, ease of maintenance, and terrain and cargo capabilities.
Innovation Solution
A side-by-side recreational off-highway vehicle design featuring a chassis with a front, middle, and rear portion, including frame members of rectangular and circular cross-sections, a continuously variable transmission, and vibration isolation for the engine and transaxle, along with strategically positioned seats and suspension systems to optimize ground clearance and center of gravity, enhancing stability and accessibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the vehicle width is reduced to access narrower trails, then terrain accessibility is improved, but occupant comfort and stability deteriorate
Solution Approach 1:
The vehicle employs asymmetric seat positioning where the driver seat is positioned lower than the passenger seat. This asymmetric arrangement allows the driver to have better control and visibility while the passenger enjoys improved stability and comfort. The differential seat heights enable the vehicle to maintain a wider stance for stability while keeping the overall width manageable for trail access.
Solution Approach 2:
The invention addresses the width-stability contradiction by introducing vertical dimension adjustments through differently positioned seats at different heights. Instead of solely relying on horizontal width adjustments, the patent utilizes vertical positioning variations to achieve both narrow profile for trail access and adequate stability for occupants.
2Stability of the object's composition
If the wheelbase is increased to improve stability, then occupant ride characteristics are improved, but turning radius and maneuverability worsen
Solution Approach 1:
The vehicle incorporates a dynamic suspension system that allows real-time adjustment of suspension characteristics. This dynamic capability enables the vehicle to maintain a longer wheelbase for stability during straight-line travel while accommodating tighter turning radii when maneuvering by adjusting suspension compliance and wheel alignment dynamically.
Solution Approach 2:
The patent utilizes adjustable suspension parameters including spring rates, damping coefficients, and anti-roll bar stiffness that can be modified based on operating conditions. These parameter changes allow the vehicle to optimize the effective wheelbase and turning characteristics without physically altering the frame geometry.
3Adaptability or versatility
If undercarriage clearance is increased to navigate rough terrain, then terrain capability is improved, but vehicle height and center of gravity worsen
Solution Approach 1:
The vehicle employs segmented or modular undercarriage components including independently adjustable suspension arms, relocatable fuel tank, and separable storage compartments. This segmentation allows strategic positioning of heavy components lower in the vehicle profile while maintaining adequate undercarriage clearance through adjustable suspension geometry.
Solution Approach 2:
The patent resolves the clearance-center of gravity contradiction by utilizing angular adjustments in suspension geometry rather than purely vertical displacement. By changing the angle and orientation of suspension arms and linkages, the vehicle achieves increased undercarriage clearance while keeping the center of gravity relatively low through optimized component placement.
4Power
If power distribution is optimized for harsh terrain, then terrain performance is improved, but fuel consumption and emissions worsen
Solution Approach 1:
The vehicle incorporates a dynamic power management system with variable valve timing, adjustable turbocharger boost pressure, and electronically controlled fuel injection rates. These dynamic adjustments allow the engine to deliver high power output when needed for harsh terrain while operating at lower fuel consumption rates during normal cruising conditions.
Solution Approach 2:
The patent utilizes multiple engine parameters including compression ratio, valve timing, fuel-air mixture ratio, and ignition timing that can be dynamically adjusted based on operating conditions. These parameter changes enable the engine to optimize the balance between power output for terrain performance and fuel efficiency for reduced consumption and emissions.
Data Source
AI summary
A recreational off-highway vehicle includes side-by-side passenger and driver seats held within a chassis. The seats sit low in the chassis and are covered by a roll cage. Grab handles are positioned on the sides of the passenger seat. Select large round tubing protects the vehicle, while rectangular tubing frames the portions of the vehicle beneath body panels. The vehicle is powered by an engine rearward of the seats that is connected to a transaxle. A radiator is positioned above the engine. A cover with an access panel is situated between the engine and the passenger seats. The vehicle is suited for rough terrain travel.