Work Vehicle Engine Compartment Cooling via Guided Airflow
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Solution Overview
Problem
In work vehicles, the engine compartment generates excessive heat, reducing the cooling efficiency for components due to ambient air being heated by the muffler or air cleaner before reaching the radiator.
Innovation Solution
A work vehicle design that includes an engine compartment with a guiding member to direct outdoor air directly to components like the urea water injection device, utilizing a cooling fan to create negative pressure and increase airflow, which is then directed through a duct system to enhance cooling efficiency by minimizing air passage area as it approaches the component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If ambient air is used for cooling components in the engine compartment, then cooling is provided, but the air is heated up by passing the muffler or air cleaner which reduces cooling efficiency
Solution Approach 1:
The air flow path is segmented into separate zones: a first air flow path for the radiator that bypasses the muffler and air cleaner, and a second air flow path for the exhaust gas post-processing device. This segmentation prevents the harmful heated air from reaching components that require cooling, thereby resolving the contradiction between providing cooling and avoiding heated air exposure.
Solution Approach 2:
A partition wall is introduced as an intermediary structure between the engine compartment and the cooling compartment. This partition wall with its specific opening configuration acts as a mediator that directs ambient air through designated paths, preventing direct contact between the air and heat-generating components like the muffler and air cleaner, thus maintaining cooling efficiency.
2Volume of moving object
If components are installed inside the engine compartment, then space is utilized, but the temperature inside the compartment rises exposing members to high temperatures
Solution Approach 1:
The vehicle's rear section is segmented into two distinct compartments: an engine compartment for housing the engine and exhaust system, and a cooling compartment for temperature-sensitive components. This spatial segmentation allows efficient use of available volume while maintaining appropriate thermal environments for different components.
Solution Approach 2:
The partition wall serves as an intermediary structure that separates the hot engine compartment from the cooling compartment. It allows controlled air flow through specific openings while preventing direct thermal exposure, enabling components to be installed in both compartments with appropriate thermal protection.
3Temperature
If a duct is provided to guide ambient air to the radiator without flowing by the muffler or air cleaner, then cooling efficiency is improved, but device complexity increases
Solution Approach 1:
The partition wall is designed to combine multiple functions: it separates the engine compartment from the cooling compartment, provides structural support, and incorporates openings that guide air flow. By merging these functions into a single integrated structure, the overall device complexity is reduced compared to having separate ducts and air guiding components.
Solution Approach 2:
The partition wall serves multiple purposes simultaneously: it acts as a thermal barrier, a structural element, and an air flow guide. This multi-functionality eliminates the need for additional dedicated components for each function, thereby reducing overall system complexity while maintaining improved cooling efficiency.
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 configuration effectively cools components within the engine compartment by using outdoor air, improving cooling efficiency and reducing the temperature inside the compartment.
Implementation Method 1
negative pressure is developed on the air intake side of the cooling fan due to the action of the cooling fan
Implementation Method 2
The suction part is disposed inside the engine compartment. The suction part sucks air into the engine compartment.
Implementation Method 3
The guiding member is configured so as to guide outdoor air sucked in from the outdoor air intake port onto the member to be cooled.
Implementation Method 4
The member to be cooled is disposed within an air flow produced between the suction part and the guiding member
Data Source
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AI summary
A work vehicle (100) is provided with an engine (11), a member (13) to be cooled, a guiding member (23), a suction part (91), a cooling compartment (3), a partition wall (6), a cooling fan (5), a duct (9), a diesel particulate filter device (121), a selective catalyst reduction device (123), a connecting pipe (122), and a reducing agent injection device. The diesel particulate filter device (121) treats exhaust gas from the engine (11). The selective catalyst reduction device (123) treats exhaust gas from the engine (11). The connecting pipe (122) connects the diesel particulate filter device (121) and the selective catalyst reduction device (123). The member (13) to be cooled is the reducing agent injection device for injecting a reducing agent into the connecting pipe (122). The member (13) to be cooled is disposed within an air flow produced between the suction part (91) and the guiding member (23).