Rivet structure for spacer sleeve on cross-section-variable nozzle ring of turbocharger

Abstract

The invention discloses a rivet structure for a spacer sleeve on a cross-section-variable nozzle ring of a turbocharger. The rivet structure comprises a first workpiece, a second workpiece and a rivet piece, wherein a first through hole is formed in the first workpiece, a second through hole coaxial with the first through hole is formed in the second workpiece, the rivet piece is sleeved with the spacer sleeve in a fixed mode, the two ends of the spacer sleeve abut against the two close surfaces of the first workpiece and the second workpiece respectively. The first through hole and the second through hole each comprise a cylindrical hole and a counterbore, the hole wall of each of the two counterbores comprises an outwards-expanded first conical wall and an outwards-expanded second conical wall, and the two ends of the rivet piece are riveted and pressed into the two counterbores. According to the rivet structure, the stress area of the rivet piece is larger, the deformation amount of the rivet piece is smaller, and the stress of the rivet piece is smaller, so that the rivet piece cannot be easily cracked, the strength of the rivet piece is improved, and the mechanical property is better.

Description

technical field [0001] The invention relates to a riveting structure for a spacer sleeve on a variable-section nozzle ring of a turbocharger. Background technique [0002] Turbochargers are widely used in automobiles, ships, tanks and other fields, especially my country's automobile emission standards are becoming more and more stringent. In order to meet the requirements of my country's environmental protection, all vehicles must meet the National IV or above from January 1, 2015 Emission standards can only be listed, so domestic vehicle OEMs are testing and batch testing turbochargers, and variable cross-section nozzle ring products are one of the main components of turbochargers. The turbocharger is affected by high temperature, high pressure, corrosion, thermal shock, fatigue, etc., so not only the material properties must meet the working conditions of the turbocharger, but also the connection between its components must be safe and reliable. After the distance sleeve o...

AI Technical Summary

Problems solved by technology

[0004] The distance sleeves with some variable cross-section nozzle rings adopt the conventional riveting method. When riveting two workpieces, generally a cylindrical straight hole is drilled on the two workpieces first, and then the riveted parts are directly riveted on the two workpieces. A cylindrical straight hole comes up to rivet the two workpieces. In this way, after the riveting is completed, the head of the riveted part is pressed against the surface of the workpiece, the force-bearing area is small, the deformation of the riveted part is large, and the stress of the riveted part is relatively large. Large, it is easy to cause cracking of the riveted parts, and the strength of the riveted point is low and the mechanical properties are poor

[0005] The main defects of the above-mentioned riveting structure: (1) The head of the riveting part is pressed against the surface of the workpiece, the force-bearing area is small, the deformation of the riveting part is large, and the risk of cracking is high; (2) In order to increase the strength of the riveting point, The riveting margin needs to be increased, which will cause the deformation of the distance sleeve and the riveting height to exceed the size of the equipment. If the riveting margin is reduced, the strength of the riveting point will not meet the requirements; (3) The riveting point in the traditional riveting method It only stays on the surface of the product, with low strength and weak anti-fatigue ability. During work, the stress points are concentrated on the riveting points, and there is a risk of falling off under high temperature and high frequency vibration

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