Utility Vehicle Powertrain Layout for Narrow Off-Road Packaging
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Solution Overview
Problem
Existing utility vehicles face challenges in achieving sufficient powertrain capabilities while maintaining a compact configuration and width suitable for off-road terrain due to interference with other components.
Innovation Solution
A powertrain assembly design where the engine and transmission are longitudinally aligned, with the engine positioned rearward of the transmission, and a prop shaft configuration that allows for angled orientations to minimize vehicle width, incorporating a steel belt continuously variable transmission and a disconnect mechanism for differentials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the engine and transmission are positioned to provide sufficient powertrain capabilities, then power capability is improved, but vehicle width increases causing interference with other components
Solution Approach 1:
The patent repositions the engine and transmission from a lateral arrangement to a longitudinal arrangement along the vehicle's fore/aft axis. The engine is positioned forward of the transmission, both aligned along the longitudinal centerline, which reduces vehicle width while maintaining powertrain capability. This dimensional reconfiguration allows the powertrain components to occupy length rather than width, resolving the contradiction between power capability and vehicle width.
2Power
If the engine and transmission are positioned to provide sufficient powertrain capabilities, then power capability is improved, but interference with other components (rear suspension, cargo box) increases
Solution Approach 1:
By aligning the engine and transmission longitudinally along the fore/aft direction rather than laterally, the patent relocates the powertrain components to a different spatial dimension. This longitudinal positioning places the engine forward of the transmission, both centered on the longitudinal axis, which eliminates interference with rear suspension and cargo box components that would be affected by a wider lateral arrangement.
3Area of stationary object
If the vehicle width is reduced for trail compatibility, then trail compatibility is improved, but powertrain capabilities are reduced
Solution Approach 1:
The patent maintains adequate powertrain capability while reducing vehicle width by reconfiguring the engine and transmission arrangement from lateral to longitudinal positioning. The engine is placed forward of the transmission along the longitudinal centerline, allowing the powertrain to fit within a narrower width envelope suitable for trail compatibility without sacrificing power output or transmission capacity.
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.