Bushing, roller pin assembly and guide piston assembly

Abstract

The invention discloses a bushing, a roller pin assembly and a guide piston assembly, the bushing comprises a cylindrical bushing body, the inner wall of the bushing body is provided with an inner lubricating oil groove, and the outer wall of the bushing body is provided with an outer lubricating oil groove. A lubricating oil hole used for communicating the inner lubricating oil groove with the outer lubricating oil groove is further formed in the bushing body, and the inner lubricating oil groove and the outer lubricating oil groove are both grooves which are through front and back in the axial direction. The roller pin assembly and the guide piston assembly each comprise one bushing. The bushing, the roller pin assembly and the guide piston assembly provided by the invention have the advantages of being high in reliability, good in lubricating performance, long in service life, simple in structure and convenient to produce and machine.

Description

technical field [0001] The invention relates to the technical field of diesel engine accessories, in particular to a bushing, a roller pin assembly and a guide piston assembly. Background technique [0002] The guide piston assembly is an important component in the transmission part of the fuel injection pump, and its working condition has a direct impact on the quality of the fuel injection pump. In order to meet the power, economy and emission requirements of modern new diesel engines, it is necessary to provide higher fuel injection pressure, which increases the load between the roller body of the guide piston assembly and the cam of the cam box, resulting in the roller body and the cam of the cam box. The contact stress between the bushing, the roller pin and the bushing increases, which intensifies the mechanical wear between the roller body and the bushing, the roller pin and the bushing, and severe abnormal wear will lead to damage or failure of the guide piston assem...

AI Technical Summary

Problems solved by technology

In order to meet the power, economy and emission requirements of modern new diesel engines, it is necessary to provide higher fuel injection pressure, which increases the load between the roller body of the guide piston assembly and the cam of the cam box, resulting in the roller body and the cam of the cam box. The contact stress between the bushing, the roller pin and the bushing increases, which intensifies the mechanical wear between the roller body and the bushing, the roller pin and the bushing, and severe abnormal wear will lead to damage or failure of the guide piston assembly, resulting in The entire fuel injection pump fails

In order for the pilot piston assembly to work normally, good lubrication must be provided, but there are many deficiencies in the structure of the conventional pilot piston assembly, resulting in the reliability, lubrication performance and service life of the conventional pilot piston assembly being unable to adapt to the increasing transmission components. The harsher working conditions cannot meet the requirements of high-strength fuel injection pumps, so it is necessary to improve the various parts of the pilot piston assembly

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