Cab Ceiling Layout for Roll Blind and Duct Airflow Compatibility
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Solution Overview
Problem
The interference between a roll blind and the air outlet of a duct in a construction machine cab, particularly a hydraulic excavator, prevents the wind from hitting the upper body of the crew member due to limited internal space, making it difficult to position the duct correctly.
Innovation Solution
A configuration that includes a ceiling part with a top window, a roll blind with a winding device, and a louver system, where the ducts are positioned below the winding device and the louvers are placed forward of it, ensuring the wind hits the upper body despite the roll blind's presence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a roll blind is disposed on the top window to block sunlight, then the sunlight blocking function is improved, but the duct cannot be disposed in the desired position and the wind cannot hit the upper body of the crew member
Solution Approach 1:
The patent changes the spatial arrangement by positioning the duct in the depth dimension (passing below the winding device) rather than competing for the same horizontal space, allowing the louver to be disposed further to the front side and effectively direct wind to the upper body
2Ease of operation
If the duct is disposed inside the ceiling to avoid interference with the front window, then the front window operation is improved, but the internal space of the ceiling becomes too small to accommodate both the duct and roll blind without interference
Solution Approach 1:
The patent applies nesting by having the duct pass through the ceiling internal space below the winding device, effectively nesting the duct within the available vertical space rather than requiring separate horizontal space, thus accommodating both components in the limited ceiling volume
Data Source
AI summary
A cab includes a ceiling part including a top window, a roll blind, a first duct and a louver. The roll blind includes a screen disposed on an inside of the top window, and a winding device disposed inside the ceiling part on a rear side of the top window. The winding device is configured to wind up the screen. The first duct is disposed inside the ceiling part. The first duct passes below the winding device. The louver disposed further to a front side than the winding device and in a first air outlet of the first duct.