A car door sealing structure and optimization design method

Abstract

The invention discloses a car door sealing structure and an optimal design method, comprising a sealing member arranged at the bottom of the car door, the sealing member cooperates with a sealing surface on the car body to realize the sealing between the car door bottom and the car body; the sealing The components include: a sealing cage meeting the set hardness requirements, the bottom of the sealing cage is provided with a concave arc surface in the length direction, and the arc surface matches the protrusion on the sealing surface of the car body; the arc surface A soft sealing layer is laid on the surface, and the soft sealing layer can make the arc surface tightly coupled with the protrusion. The vehicle door sealing structure of the present invention can reduce external noise from entering the passenger compartment space, improve occupant comfort, effectively prevent dust, rainwater, etc. from eroding the vehicle door and its nearby parts, and prolong the service life of the vehicle door.

Description

technical field [0001] The invention relates to the technical field of rail vehicle door sealing, in particular to a door sealing structure and an optimal design method. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] The rail vehicle door is one of the important components of the vehicle. Its main function is to provide passages for passengers to enter and exit, and it also has functions such as sound insulation, dustproof, and water seepage prevention. Existing rail vehicle doors mainly include single door and double door, and the sealing performance and service life of the double door are more difficult to guarantee. As we all know, the sealing performance of the rail vehicle door is not only related to the main structure of the door, but more importantly, it is closely related to the installation and contact between the door and the c...

AI Technical Summary

Problems solved by technology

At present, due to the combined effects of existing materials, manufacturing processes, service environment, cost and many other factors, the existing door seals are mostly made of EPDM rubber as the main raw material, supplemented by corresponding fillers. This type of rubber material The overall performance of the seal can basically meet the performance requirements of the existing vehicle door for the seal. However, due to the reasonable matching of the design cross-section, installation fit, and service environment of the door around the seal, the stress state of the seal is unstable. The sealing performance and service life of the car door are greatly reduced, mainly in the following aspects:

[0005] (1) The seal on the bottom surface of the double door of the existing vehicle adopts an L-shaped cross-section, and the bottom of the L-shaped cross-section is a trapezoidal structure, resulting in the most unfavorable force on the top of the bottom seal after the door is closed, and the convexity between the front end of the seal and the car body floor The platform metal strip is only in compression contact and lacks the necessary lateral constraints, which leads to uneven force on the seal when it is vibrated by the vehicle body, and the seal swings inside and outside or vibrates with the vehicle body after being squeezed and bent in a single direction, accelerating the seal. Fatigue aging, affecting the service life of the seals, resulting in the need to replace the seals multiple times, affecting the running time of the vehicle and increasing the cost of material replacement

[0006] (2) The unilateral deformation and vibration of the bottom surface of the door and the side seal under the action of extrusion lead to weakening of the sealing effect, gaps between the door and the door or the car body, degradation of the sound insulation performance of the door, noise from the external environment, vehicle equipment operation and vibration, etc. The sound transmission through the gap increases the noise in the car and affects the comfort of passengers

[0007] (3) When there is a gap between the door and the car body, corrosive media such as external rainwater and dust can easily enter the passenger room and nearby related equipment, resulting in accelerated corrosion and aging of the equipment, and even affecting the normal use of the product in severe cases, endangering driving safety

Images