Car roof middle cross beam

Abstract

The invention discloses a car roof middle cross beam, which comprises a body and an inner plate, wherein the body is in a thin plate structure, and the inner plate is connected on the body. The invention is characterized in that one end of the body is provided with two identical bolt holes, the other end of the body is also provided with two identical bolt holes, and the bolt holes at both ends are symmetrical to each other. A slender beam formed by welding the inner plate on the body in a lapping way is positioned right above posts B, the bolt holes at both ends of the body are connected with the inner plate of the left post and the right post B through screw bolts, and in addition, the slender beam is welded with a side wall assembly for forming a closed annular beam structure. The invention has the advantages that through the welding and the assembling connection between the posts B and the side wall assembly, the stiffness and the intensity between the positions of the posts B of the side wall and the car roof are improved, the side collision force can be effectively guided, and the safety of passengers can be ensured during the side collision. In addition, the NVH problem caused by whole car torsion stiffness improvement and car roof vibration in high-speed movement can be greatly solved.

Description

technical field [0001] The invention relates to auto parts, in particular to a middle beam of a car top cover. Background technique [0002] The structural design of the beam in the roof of a car plays an important role in the collision of the vehicle, the torsional stiffness of the vehicle, and the strength of the roof. In the event of a side collision, the lower part of the B-pillar is first subjected to the impact force and deforms, and then the connecting parts are deformed by force. When the cross beam in the top cover is subjected to a large deformation of the B-pillar, the collision energy transfer is dispersed to all parts of the vehicle body. place, so that the passenger compartment forms a good cage structure to protect the occupants from injury. The beam structure design in the top cover is an indispensable middle link to form the cage structure. Similarly, in terms of improving the flow stiffness of the vehicle, the vibration transmitted from the suspension of ...

AI Technical Summary

Problems solved by technology

[0003] The cross-section of the cross beam in the existing car top cover is "W" shape, and the beam and the top cover are connected by expansion glue, which can strengthen the local stiffness of the top cover, and can offset the force of the air flow on the top cover during high-speed movement , prevent resonance, improve NVH (N stands for noise, V stands for vibration, H stands for comfort) performance, but in the side collision of the vehicle, due to the insufficient rigidity of the connection with the left and right side panels, the force transmission during side collision is not very smooth, The protection of the passenger compartment cannot be maximized, so the beam structure at the B-pillar position on the left and right sides must be strengthened

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