Utility Vehicle HVAC Duct Layout for Rear Cabin Air Delivery
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Solution Overview
Problem
Utility vehicles designed for rough terrain often face challenges in providing effective HVAC systems that efficiently deliver treated air to rear passenger compartments while maintaining a compact and spacious interior layout.
Innovation Solution
The design incorporates a longitudinally extending frame with a HVAC duct system that extends through and under the front seating section, coupling to a mid-panel to deliver treated air to the rear, and features a low-profile duct configuration that maximizes front compartment space and allows for compact packaging of HVAC hoses, along with a revised drive shaft carrier bearing system that optimizes frame geometry for improved volume utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional HVAC duct system is installed in utility vehicles, then treated air can be delivered to rear passenger compartments, but the duct system occupies valuable interior space and complicates the vehicle layout
Solution Approach 1:
The HVAC duct is nested within the existing frame structure by routing it through the driveshaft carrier bearing hollow cavity and along the frame members. This nesting approach allows the duct to occupy space that would otherwise be unused, delivering treated air to the rear compartment without compromising passenger or cargo space.
Solution Approach 2:
The duct system utilizes the vertical and longitudinal dimensions of the frame structure by extending through the driveshaft carrier bearing height and routing along the frame members from front to rear. This three-dimensional routing approach efficiently delivers air to the rear compartment while minimizing interference with the horizontal interior space.
2Reliability
If the HVAC duct is routed through the vehicle interior, then treated air reaches rear passengers, but the duct and hoses complicate the interior layout and reduce available space
Solution Approach 1:
The driveshaft carrier bearing hollow cavity serves dual purposes: it supports the driveshaft functionally while simultaneously housing the HVAC duct. This multi-functionality approach eliminates the need for separate duct routing paths, simplifying the overall system architecture and reducing interior complexity.
Solution Approach 2:
The HVAC duct routing is merged with the existing frame structure and driveshaft carrier bearing assembly. By combining the duct path with structural and mechanical components already present in the vehicle, the system reduces the number of separate elements and simplifies the interior layout.
3Reliability
If the driveshaft carrier bearing uses a conventional mounting system, then the driveshaft is supported, but the frame geometry does not optimize volume utilization
Solution Approach 1:
The mounting system uses asymmetric frame geometry with the first flange coupling point positioned at a different height than the second flange coupling point. This asymmetric arrangement optimizes the use of frame volume by accommodating the driveshaft carrier bearing in a configuration that better utilizes the available three-dimensional space within the frame structure.
Solution Approach 2:
The mounting system changes the geometric parameters of the frame by creating a tilted mounting plane where the line through the flange coupling points is angled relative to the horizontal axis. This parameter change allows for optimized volume utilization while maintaining proper driveshaft support and alignment.
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 solution ensures efficient air delivery to rear passengers while maintaining a spacious and compact interior, enhancing passenger comfort and operational efficiency in utility vehicles.
Implementation Method 1
an HVAC duct extending through and under the front seating section and coupling to the mid panel to deliver treated air to the rear seating area
Data Source
AI summary
A utility vehicle is described having front and rear passenger area, and an HVAC system provides treated air to both front and rear areas. The front area includes a tunnel extending longitudinally rearwardly, and a low profile duct extends within the tunnel to communicate treated air to the rear passenger area. The frame has been modified to mount a drive shaft carrier bearing to maximize the arear under the tunnel for hose routing. The frame has been modified to maximize the ingress area for the foot of the rear passenger. The frame has been modified to better seal the vehicle when doors are utilized.