Rotating Door Weather Strip Reduces Closing Force
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Solution Overview
Problem
The existing door weather strips in motor vehicles face issues with increased closing force due to reduced elastic force over time, leading to deteriorated air-tightness performance and user dissatisfaction in terms of operation sensitivity and noise.
Innovation Solution
A door sealing structure featuring a rotatable door weather strip with an elastic member and a fixing bracket, allowing the weather strip to protrude and rotate, reducing closing force while maintaining air-tightness through increased contacting force and friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the door weather strip is overlapped with the vehicle body panel to maintain air-tightness, then the air-tightness performance is improved, but the closing force of the door increases due to the reaction force of the weather strip
Solution Approach 1:
The door weather strip is designed to rotate about a rotation axis during door closing, transitioning from a static overlapping structure to a dynamic rotating mechanism. This rotation allows the weather strip to maintain tight contact with the vehicle body panel for air-tightness while reducing the reaction force that contributes to closing force, thereby resolving the contradiction between air-tightness performance and door closing ease
Solution Approach 2:
The invention changes the operational parameters of the door weather strip by introducing rotational movement and varying the contact angle with the vehicle body panel during door closing. This parameter change enables the weather strip to optimize both air-tightness contact force and reaction force magnitude, addressing the contradiction between maintaining reliable sealing and reducing door closing force
2Reliability
If the elastic force of the door weather strip is increased to maintain air-tightness, then the air-tightness performance is improved, but the closing force of the door increases due to the reaction force
Solution Approach 1:
By enabling the door weather strip to rotate during door closing, the invention transforms the static elastic force application into a dynamic process. The rotation allows the weather strip to achieve necessary elastic deformation for air-tightness while controlling the direction and magnitude of the reaction force, thereby improving ease of door closing without sacrificing air-tightness performance
Solution Approach 2:
Instead of directly applying elastic force perpendicular to the door panel surface, the invention inverts the approach by using rotational movement to convert part of the elastic force into tangential contact force. This inversion allows the weather strip to maintain air-tightness through friction and contact pressure generated by rotation, rather than relying solely on direct elastic repulsion, thereby reducing the reaction force component that increases closing force
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
The solution reduces the closing force of the door, enhances air-tightness performance, and extends the service life by allowing appropriate elastic deformation and increased durability.
Implementation Method 1
an elastic member which is installed in and elastically supports the door weather strip
Implementation Method 2
the door weather strip rotates on the door inner panel to reduce the closing force of the door, thereby improving sensitivity thereof
Data Source
AI summary
A door sealing structure for a motor vehicle includes a receiving recess provided at the door inner panel, a door weather strip of which a partial portion is inserted into the receiving recess so as to be rotatably supported and formed with a size capable of protruding outside from the receiving recess, and an elastic member being installed in and supporting the door weather strip elastically for preventing the door weather strip from being detached from the receiving recess, thereby reducing a closing force of a door and improving an air-tightness performance.