Work Vehicle Cabin Air Duct Layout for Lower Hood Height
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Solution Overview
Problem
Work vehicles with cabins require effective air conditioning for operator comfort, but existing designs often compromise on forward visibility and hood height due to bulky air conditioning equipment.
Innovation Solution
An air conditioning arrangement with a hood-mounted unit featuring separate front and rear ducts for conditioned air distribution, allowing for customizable airflow through upper, defrost, and lower outlets, and a rearward extension of the front duct to reduce equipment size and hood height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If air conditioning equipment is installed in the hood, then air conditioning function is provided, but hood height increases
Solution Approach 1:
The front duct extends rearward underneath the air conditioning unit, utilizing the vertical space and under-space in the hood rather than increasing height. This dimensional reorganization allows the duct to reach the dashboard outlets without increasing hood height, resolving the contradiction between providing air conditioning function and maintaining compact hood dimensions.
2Adaptability or versatility
If separate front and rear ducts are used for air distribution, then airflow control flexibility is improved, but device complexity increases
Solution Approach 1:
The air conditioning unit serves multiple functions through a unified design: it provides both front airflow (through the extended front duct to dashboard outlets) and rear airflow (through the rear duct to rear outlets) using a single condenser and compressor system. This multi-functionality achieves airflow control flexibility without proportionally increasing device complexity.
Solution Approach 2:
The front duct and rear duct are integrated into a unified air distribution system sharing common components (compressor, condenser, expansion valve). This merging approach allows separate airflow paths to different outlets while avoiding the complexity of completely independent air conditioning systems.
3Area of stationary object
If air conditioning unit is housed in the hood, then forward visibility is maintained, but hood space for equipment is reduced
Solution Approach 1:
The front duct utilizes the vertical dimension by extending downward and rearward underneath the air conditioning unit, rather than expanding horizontally or increasing height. This efficient use of three-dimensional space accommodates the duct routing within the limited hood volume while maintaining clear forward visibility.
Data Source
AI summary
An air conditioning arrangement for a work vehicle having a cabin includes: a hood disposed forwardly of the cabin; an air conditioning unit housed in the hood forwardly of the cabin; and a dashboard provided in a front portion in the cabin. The air conditioning unit includes a rear duct for delivering conditioned air rearward and a front duct having a portion for delivering conditioned air frontward. The front duct further has a portion extending rearward under the air conditioning unit. The dashboard includes an upper outlet, a defrost outlet and a lower outlet. Each of the upper outlet, the defrost outlet and the lower outlet is communicated with either one of the front duct and the rear duct.