Compact ATV Layout for Steering and Fuel System Positioning
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Solution Overview
Problem
Compact all-terrain vehicles face challenges in maintaining a compact body size due to the necessary installation of large electric power steering units and electronic fuel injection systems, which increase the vehicle's width and height dimensions.
Innovation Solution
The vehicle design includes an engine unit positioned rearward of the steering shaft, a fuel tank with a built-in fuel pump located rearward of the cylinder head, and a rear gear unit with a wet brake, all aligned in the front-back direction and centered widthwise, along with an electric power steering unit positioned forward of the cylinder head, to minimize the vehicle's widthwise dimension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an electric power steering unit with a large electric motor and gear mechanism is installed, then steering assistance is provided, but the width and height dimensions of the vehicle body increase
Solution Approach 1:
The patent repositions the electric power steering unit from a lateral arrangement (increasing width) to a longitudinal arrangement along the front-back direction of the vehicle. The electric motor is mounted on the vehicle body frame and connected to the steering shaft through a longitudinal layout, transforming the spatial dimension occupied by the steering system from width to length, thereby reducing the vehicle's width and height dimensions while maintaining steering assistance functionality.
2Adaptability or versatility
If a fuel tank with a built-in fuel pump is installed to supply high pressure fuel, then electronic fuel injection is enabled, but the width and height dimensions of the vehicle body increase
Solution Approach 1:
The patent integrates the fuel pump directly within the fuel tank structure, merging two previously separate components (fuel tank and fuel pump) into a single integrated unit. This combination eliminates the need for external pump mounting space and complex piping arrangements, enabling electronic fuel injection functionality while minimizing the space required, thus avoiding increases in vehicle body width and height dimensions.
3Adaptability or versatility
If the engine unit, fuel tank, and rear gear unit are positioned to accommodate electrically driven accessories, then complete accessories are installed, but the width dimension of the vehicle body increases
Solution Approach 1:
The patent arranges the engine unit, fuel tank with built-in pump, and rear gear unit with wet brake in a longitudinal configuration along the front-back direction of the vehicle, utilizing the length dimension rather than expanding the width dimension. This linear arrangement allows complete accessory installation while maintaining a compact width profile.
Solution Approach 2:
The patent positions each component (engine unit, fuel tank, rear gear unit) at specific locations along the longitudinal axis of the vehicle, optimizing the local spatial arrangement. The engine unit is positioned forward, the fuel tank is integrated centrally, and the rear gear unit is positioned rearward, creating an efficient longitudinal distribution that accommodates all accessories without increasing vehicle width.
Data Source
AI summary
An engine unit 5 is arranged in the middle of the vehicle body frame 2 with respect to the widthwise direction of the vehicle and rearward of the steering shaft 28, and the fuel tank 10 with a built-in fuel pump 11 and the rear gear unit 31 comprising a wet brake 45 are arranged rearward of the cylinder head 20b of the engine unit 5 and such that at least a portion of the fuel tank 10 and of the rear gear unit 31 is located in the middle with respect to the widthwise direction of the vehicle, and the power steering unit 47 comprising an electric motor 49 is arranged forward of the cylinder head 20b and such that at least a portion of the unit is located in the middle with respect to the widthwise direction of the vehicle.