Metal reinforcer structure for reducing torque attenuation

By designing the contact structure of stamped flip holes and fastening bolt flange surfaces in the connection between the automotive plastic parts and the metal reinforcement parts, the torque attenuation problem caused by creep of the plastic parts is solved, and the torque transmission efficiency and cost reduction are achieved.

CN222668662UActive Publication Date: 2025-03-25DONGFENG PLASTIC OMNIUM AUTOMOTIVE EXTERIOR SYST CO LTD
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Patent Information

Application Number
CN202421421267.3
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-06-21
Publication Date
2025-03-25
Estimated Expiration
2034-06-21

AI Technical Summary

Technical Problem

In the connection between automotive plastic parts and metal reinforcements, the prior art is difficult to effectively reduce torque attenuation caused by creep of plastic parts, and commonly used solutions such as increasing initial torque, increasing metal rings or using anti-loose bolts will lead to material collapse, increased cost or increased assembly complexity.

Method used

A metal reinforcement structure is designed, in which the plastic part is equipped with mounting holes, stamped flip holes are provided on the metal part, and the flange surface of the fastening bolts is in contact with the flip holes, rather than directly compressing the plastic part, which effectively avoids torque attenuation through this structure.

Benefits of technology

Through this structural design, the torque attenuation is significantly reduced, the torque transmission efficiency is improved, the torque loss caused by creep of plastic parts is avoided, and the part cost and assembly complexity is reduced.

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Abstract

The utility model relates to the field of connection of an automobile plastic part and a metal reinforcer, in particular to a metal reinforcer structure capable of reducing torque attenuation, which comprises a plastic part and a metal part arranged on one side of the plastic part, the plastic part is provided with a mounting hole, and one side of the metal part close to the plastic part is provided with a flanged hole formed by stamping. The flanged hole is located in the installation hole and extends out of the installation hole by 0-0.5 mm, a fastening bolt is installed in the flanged hole, the diameter of the flange face of the fastening bolt is larger than that of the installation hole, the flange face of the fastening bolt makes contact with the end face, extending out of the installation hole, of the flanged hole, and a nut is fixed to the side, away from the plastic part, of the metal part. According to the metal reinforcer structure capable of reducing the torque attenuation, the hole flanging structure of the metal piece is slightly higher than or flush with the surface of the plastic piece, so that the flange face of the fastening bolt is in direct contact with the metal flanging when the fastening bolt is fastened, the plastic piece is prevented from being directly pressed, and the torque attenuation is remarkably reduced.
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