Rear heat shield structure of auto muffler

Abstract

The invention discloses a rear heat shield structure of an auto muffler, which is a whole rectangular board. The middle of a rear heat shield is hogged, while the two ends are flat in the direction of length; elongated reinforcing ribs which extend along the direction of length are parallelly arranged on the face of the heat shield by stamping, and globular reinforcing ribs are arranged between the elongated reinforcing ribs. Under the condition of not increasing the thickness of the heat shield, the invention, by structural improvement, improves the structure rigidity of the rear heat shield structure of the auto muffler on one hand, and on the other hand, make the rigidity of the whole heat shield distribute uniformly and eliminate the local mode area of the rear heat shield structure of the auto muffler, thereby avoiding the abnormal sound caused by the resonance produced by the rear heat shield structure of the auto muffler driven by other driving sources. The structure has the advantages of simple structure, easy manufacturing and low cost.

Description

technical field [0001] The invention belongs to an automobile muffler system, and in particular relates to a rear heat shield structure of an automobile muffler. Background technique [0002] In the existing automobiles, the rear heat shield of the muffler is a rectangular flat plate structure, which is usually connected with two beams by four screws. Since the span between the installation points reaches 400mm, the rear heat shield is only installed on the periphery. Flanging, the rest are flat, and without any reinforcement structure, although the surrounding flange structure can improve the overall rigidity, but because there is no reinforcement structure design in the middle part, the rigidity of the middle part is still poor, and local modes are easy to form The natural frequency of these parts is low, and it is very easy to resonate under the excitation of other excitation sources, resulting in abnormal noise, which is not conducive to the improvement of the NVH perfor...

AI Technical Summary

Problems solved by technology

[0002] In the existing automobiles, the rear heat shield of the muffler is a rectangular flat plate structure, which is usually connected with two beams by four screws. Since the span between the installation points reaches 400mm, the rear heat shield is only installed on the periphery. Flanging, the rest are flat, and without any reinforcement structure, although the surrounding flange structure can improve the overall rigidity, but because there is no reinforcement structure design in the middle part, the rigidity of the middle part is still poor, and local modes are easy to form area, and the natural frequency of these parts is low, and it is very easy to resonate under the excitation of other excitation sources, causing abnormal noise, which is not conducive to the improvement of the NVH performance of the whole vehicle

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