Built-in Plug-pull Door Mechanism for Rail Vehicle
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Solution Overview
Problem
Existing door systems in rail vehicles, such as swinging sliding plug doors, concealed side sliding doors, and hung sliding doors, face issues with reduced vehicle width, increased safety risks, poor sealing performance, and aerodynamic inefficiencies, leading to discomfort and increased energy consumption.
Innovation Solution
A built-in sliding plug door system with an improved bearing mechanism, driving mechanism, sealing mechanism, and pressing mechanism, utilizing a guiding slide channel and compressible rubber sealing strips, which allows for a 'plugging-pulling' motion to ensure safety, air-tightness, and reduced wind resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a swinging sliding plug door is used, then the door can be flush with the vehicle body when closed, but the vehicle body width is reduced due to door swing space occupation
Solution Approach 1:
The door motion is changed from swinging in the lateral direction (Y-axis) to moving along the longitudinal direction (X-axis) through the guiding slide channel, eliminating the need for lateral swing space while maintaining the flush appearance when closed
2Ease of operation
If a swinging sliding plug door is used, then the door can open and close automatically, but the safety risk is increased due to door leaf falling out under pressure wave
Solution Approach 1:
The pressing mechanism applies preliminary pressing force to the door leaf through the pressing member, creating a pre-compression state that counteracts the pressure wave forces during high-speed operation, preventing the door from being forced open or falling out
3Ease of operation
If a swinging sliding plug door is used, then the door can be driven by a drive unit, but the sealing performance is poor due to air leakage under negative pressure
Solution Approach 1:
The pressing mechanism creates preliminary compression of the sealing strips between the door leaf and vehicle body, establishing a pre-loaded sealing state that maintains sealing effectiveness under negative pressure conditions during high-speed operation
4Length of stationary object
If a concealed side sliding door is used, then the vehicle body width can be increased, but the aerodynamic performance is poor and running resistance is high
Solution Approach 1:
The door leaf maintains a flush surface with the vehicle body exterior when closed, creating a smooth aerodynamic profile that eliminates the step height difference and surface irregularities present in concealed side sliding doors, thereby reducing aerodynamic resistance
5Length of stationary object
If a concealed side sliding door is used, then the vehicle body width can be increased, but the aerodynamic noise is high due to unsmooth shape
Solution Approach 1:
The door leaf is designed to be flush with the vehicle body outer surface when closed, creating a smooth continuous surface that eliminates the height difference and geometric discontinuities that generate aerodynamic noise in concealed side sliding door designs
Data Source
AI summary
Disclosed in the present invention is a built-in plug-pull door device for a track vehicle, which comprises a control mechanism (1), a driving mechanism(2), a bearing mechanism(3), a pressing mechanism(4), a guiding slide groove(5) and a door leaf (7). Said bearing mechanism (3) comprises two guide rod column (10), two sleeves (11), a connecting rod (12), a sliding block (13) and a guide wheel (14). Said control mechanism (1) is respectively connected to the driving mechanism (2) and the pressing mechanism (4). The device combines the advantages of a swing-outward plug-pull door and a built-in side pull door, and solves the problem of uneven appearance of the built-in side pull door via plug-pull movement and thereby reducing the effect of high-speed pressure wave on the door leaf and reducing the noise produced by high-speed travel. The width of the vehicle body is 140mm more than that of the vehicle which is provided with the swing-outward plug-pull door. When the plug-pull process of the door leaf ends, the door leaf is pressed on the vehicle body, which limits entirely the possibility that the door leaf might fall off the vehicle outward. The safety and the seal reliability can be improved.