Utility Vehicle Powertrain Layout for Narrow High-Power Packaging
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Solution Overview
Problem
Utility vehicles face challenges in achieving sufficient powertrain capabilities to meet rider demands while maintaining a compact configuration and width suitable for trail riding, due to interference with other components such as rear suspension and cargo boxes.
Innovation Solution
The design incorporates a powertrain assembly with an engine and transmission that are longitudinally aligned, allowing for a compact layout. This configuration includes a prop shaft operably coupled to the transmission and ground-engaging members, with a steel belt continuously variable transmission and a disconnect mechanism between the transmission and rear ground-engaging members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If engines and transmissions large enough to sufficiently meet the power and rider demands are used, then power capability is improved, but vehicle width increases making it difficult to fit on trail-compatible vehicles
Solution Approach 1:
The powertrain components are arranged in a longitudinal configuration along the vehicle's length rather than a lateral arrangement, shifting the spatial dimension from width to length. This allows high-power engines and transmissions to be accommodated without increasing vehicle width, maintaining trail compatibility while delivering sufficient power capability.
2Power
If large engines and transmissions are installed to meet power demands, then power output is improved, but interference with other components such as rear suspension and cargo box increases
Solution Approach 1:
The powertrain assembly is segmented into distinct longitudinal zones with the engine positioned forward and the transmission positioned rearward, creating clear spatial separation. This segmentation allows each component to be optimized for power output while minimizing interference with other vehicle systems such as the rear suspension and cargo box.
Solution Approach 2:
By arranging the engine and transmission in a longitudinal sequence rather than lateral proximity, the design shifts the spatial relationship from the width dimension to the length dimension, reducing interference with rear-mounted components while maintaining high power output capability.
3Area of moving object
If a compact powertrain configuration is used to maintain trail-compatible width, then vehicle width is reduced, but power capability may be insufficient to meet rider demands
Solution Approach 1:
The compact longitudinal arrangement packs high-power engine and transmission components along the vehicle's length, maintaining narrow width for trail compatibility while achieving sufficient power capability through optimized longitudinal spatial utilization.
Data Source
AI summary
An off-road vehicle includes a powertrain assembly having an engine and a steel belt continuously variable transmission. Portions of the powertrain assembly are supported at a rear portion of the vehicle and are positioned relative to other components of the vehicle also supported at the rear portion of the vehicle. The vehicle also is configured for various operating modes.