Public Transport Door Seal Decoupling Mechanism
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Solution Overview
Problem
In public transport vehicles, the door seals often drag over or are damaged when the vehicle stops near a platform due to insufficient height difference, causing wear and limiting the opening process.
Innovation Solution
A door system where the door seal is actively movable and supported on a sliding fit member, allowing it to pivot outwards less than the door leaf, ensuring the door seal movement distance is shorter than the door leaf movement distance, thereby preventing contact with the platform.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the door seal is fixed to the door leaf and moves with it during opening, then the door seal provides effective sealing against the platform, but the door seal contacts and drags over the platform causing wear and damage
Solution Approach 1:
The door seal is segmented from the door leaf structure and mounted on a separate movable support element (carriage) that can independently move relative to the door leaf. This segmentation allows the seal to be decoupled from the door leaf's full movement range, preventing contact with the platform while maintaining sealing contact with the door frame.
Solution Approach 2:
The door seal support element is made dynamically movable along the door leaf during the door opening/closing process. This dynamic adjustment allows the seal to maintain optimal sealing position against the door frame while avoiding contact with the platform, resolving the contradiction between sealing effectiveness and wear prevention.
2Device complexity
If the door seal moves the full distance with the door leaf during opening, then the door system structure is simple, but the door seal drags over the platform when the vehicle stops near the platform
Solution Approach 1:
A movable support element (carriage) is introduced as an intermediary between the door seal and the door leaf. This intermediary component absorbs the excess movement during door opening, allowing the seal to remain within a limited range that prevents platform contact while the door leaf completes its full opening stroke.
3Reliability
If the door seal is positioned to seal against the door frame, then effective sealing is achieved, but the door seal cannot accommodate variations in platform position and height
Solution Approach 1:
The movable support element enables the door seal to dynamically adjust its position during door operation. This dynamic capability allows the seal to maintain effective contact with the door frame while accommodating variations in platform position and height, as the seal can shift independently from the door leaf's full movement range.
Data Source
AI summary
A door system has a door leaf configured to be moved between closed and opened positions while carrying out a door leaf movement. The door leaf is moved in the vehicle transverse direction across a door leaf movement distance in the vehicle transverse direction, a door seal, disposed underneath a lower edge of the door leaf closing off the door leaf towards the bottom, and extends along the lower edge. The door seal is arranged such that the door seal, when the door leaf movement is carried out, undergoes a door seal movement and is moved in the process in the vehicle transverse direction across a door seal movement distance in the vehicle transverse direction. An arrangement of the door leaf and door seal that ensures that the door seal movement distance in the vehicle transverse direction is smaller than the door leaf movement distance in the vehicle transverse direction.