ATV Exhaust Passage Vertical Positioning for Thermal Management
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Solution Overview
Problem
Conventional all terrain vehicles face issues with excessive temperature increase of air supplied to the engine and battery due to heat from the exhaust gas, which reduces charging efficiency and shortens battery life, while also compromising minimum ground clearance due to the exhaust pipe's low positioning.
Innovation Solution
An all terrain vehicle design featuring an object-mountable supporting box that acts as a heat shielding member, locating the battery above the supporting box and the air cleaner between the frame members, with the exhaust passage positioned above the bottom plate of the frame, thereby preventing excessive temperature increase and maintaining sufficient ground clearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the exhaust pipe is arranged to pass below the crank case of the engine, then the temperature of air supplied to the engine and the temperature of the battery are prevented from being excessively increased, but the minimum ground clearance is reduced
Solution Approach 1:
The exhaust passage is repositioned from a horizontal arrangement below the crank case to a vertical arrangement passing through the body frame in the height direction. This dimensional change allows the exhaust pipe to be located higher, improving ground clearance while still providing heat shielding to the air cleaner and battery through its proximity in the vertical dimension.
Solution Approach 2:
The body frame is designed with an integrated exhaust passage that serves multiple functions: it provides structural support, guides exhaust gases vertically away from the ground, and simultaneously acts as a heat shield protecting the air cleaner and battery. This multi-functional design resolves the contradiction by combining ground clearance improvement with thermal protection.
2Temperature
If the exhaust pipe is arranged to pass below the crank case of the engine, then the temperature of the battery is prevented from being excessively increased, but the exhaust pipe may be damaged by protrusions on the ground
Solution Approach 1:
The exhaust passage transitions from a low horizontal position vulnerable to ground protrusions to a high vertical position passing through the body frame. This elevation in the vertical dimension protects the exhaust pipe from mechanical damage while maintaining its thermal shielding function for the battery and air cleaner.
Solution Approach 2:
The body frame acts as an intermediary structure that supports and protects the exhaust passage. By routing the exhaust pipe through the sturdy body frame rather than leaving it exposed below the crank case, the design provides both mechanical protection and maintains thermal management functionality.
3Length of moving object
If the exhaust passage is positioned higher, then the minimum ground clearance is increased, but the temperature of air supplied to the engine and the temperature of the battery may be excessively increased by the heat of exhaust gas
Solution Approach 1:
The exhaust passage itself serves as a thermal intermediary, positioned vertically through the body frame in close proximity to the air cleaner and battery. This arrangement allows the exhaust passage to act as a heat shield, blocking radiant heat from directly reaching these components while enabling the exhaust system to be positioned higher for improved ground clearance.
Solution Approach 2:
The exhaust passage is strategically positioned in specific locations where it can provide localized heat shielding to the air cleaner and battery. By concentrating the heat shielding function at critical thermal zones rather than requiring the entire exhaust system to be low, the design achieves both high ground clearance and effective thermal protection.
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 design effectively shields the air and battery from excessive heat, allowing the exhaust passage to be positioned higher, ensuring adequate ground clearance and preventing damage on rough terrain, while maintaining engine efficiency and battery longevity.
Implementation Method 1
The exhaust passage is provided below the bottom plate of the object-mountable supporting box. Therefore, the object-mountable supporting box acts as a heat shielding member that blocks or shields heat emitted from the exhaust passage.
Data Source
AI summary
An all terrain vehicle is capable of preventing the temperature of air supplied to an engine and the temperature of a battery from being excessively increased and has a large minimum ground clearance. An object-mountable supporting box is bridged between left and right frame members of a body frame. A battery is located above a bottom plate of the supporting box. An air cleaner is located between the left and right frame members and rearward relative to the supporting box. An intake passage is located in an area which is between the left and right frame members, above the bottom plate of the supporting box, and beside the battery. An exhaust passage passes through an area above a bottom of the frame body and below the bottom plate of the supporting box.