A variable section nozzle ring for a turbocharger

Abstract

The invention discloses a variable section nozzle ring for a turbocharger. The variable section nozzle ring comprises an installation disk, a shifting disk, a plurality of pin shafts and a plurality of shifting forks. The installation disk comprises a cylindrical portion and an annular portion. The annular portion extends outwards in the radial direction from one end of the cylindrical portion. The shifting disc is rotationally arranged on the cylindrical portion in a sleeving mode. The pin shafts are connected to the shifting disk. One end of each shifting fork and one corresponding blade are connected and rotate synchronously, and the other end of each shifting fork is provided with a gap. A sliding sleeve is rotationally arranged on each pin shaft in a sleeving mode. The sliding sleeves are sleeved with the shifting forks in a one-to-one corresponding mode through the gaps. The sliding sleeves can freely rotate and slide in the gaps in the shifting forks. The sliding sleeves are matched with the gaps in shape. The outer walls of the sliding sleeves are approximately square. The contact surfaces between the outer walls of the sliding sleeves and the two side walls of the gaps in the shifting forks are flat surfaces. Abrasion is reduced in the relative sliding process of the pin shafts and the shifting forks.

Description

technical field [0001] The invention relates to the technical field of turbochargers, in particular to a variable-section nozzle ring for turbochargers. Background technique [0002] The variable section nozzle ring assembly is a key component in today's advanced variable geometry turbochargers. For example, the Chinese patent No. 201120544236.3 discloses a variable section nozzle ring assembly. In its technical solution, the pin is fixed on On the dial, the shift fork is set on the pin, and the tail of the blade is connected with the shift fork. In this way, when the dial is rotated by external force, the pin will drive the shift fork to rotate, and the shift fork will then drive the blade to rotate to change the blade. Angle, adjust the air flow section, when the pin drives the shift fork to rotate, there will be relative sliding between the pin and the shift fork, and the line contact between the pin and the shift fork, the contact area is small, so when the relative slid...

AI Technical Summary

Problems solved by technology

[0002] The variable section nozzle ring assembly is a key component in today's advanced variable geometry turbochargers. For example, the Chinese patent No. 201120544236.3 discloses a variable section nozzle ring assembly. In its technical solution, the pin is fixed on On the dial, the shift fork is set on the pin, and the tail of the blade is connected with the shift fork. In this way, when the dial is rotated by external force, the pin will drive the shift fork to rotate, and the shift fork will then drive the blade to rotate to change the blade. Angle, adjust the air flow section, when the pin drives the shift fork to rotate, there will be relative sliding between the pin and the shift fork, and the line contact between the pin and the shift fork, the contact area is small, so when the relative sliding, the pin and the shift fork The shift fork is more prone to wear and tear. After the pin and the shift fork are worn out, the contact between the pin and the shift fork will be deformed, which will make the normal transmission between the pin and the shift fork impossible, so that the variable cross-section nozzle ring It cannot be used normally, which brings potential safety hazards; in addition, in its technical solution, the toggle plate is placed in the limited space formed by the installation plate and the limit pin, and the limit pin needs to be pressed by the volute of the turbocharger. Positioning, and there is a certain gap between the volute and the limit pin, when the turbocharger is working at high temperature and high speed, it is easy to cause the axial movement of the limit pin, which will cause the shifting plate to shift, which will make the The fork disengages from the dial, which prevents the nozzle ring assembly from functioning properly

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