Single body fuel injection pump self-lubricating tappet body roller

Abstract

The invention discloses a single body fuel injection pump self-lubricating tappet body roller. A roller pin fuel channel (X) is formed on a roller pin (6); an axial lubricating fuel channel (Z) is formed on the end part of a tappet body (3), and is communicated with a tappet cavity (D) and the roller pin fuel channel (X); an annular fuel groove (H) connected with a tappet body fuel inlet (J) is formed on the cylindrical surface of the tappet body (3); a straight hole of the roller pin fuel channel (X) is communicated with the axial lubricating fuel channel (Z), and an oblique hole of the roller pin fuel channel (X) is communicated with a conical oil groove (V) on the top surface of the roller pin (6); the axial lubricating fuel channel (Z) and the tappet body fuel inlet (J) are crossed and communicated; the tappet body fuel inlet (J) is communicated with a roller chamber (G); partial lubricating oil entering the tappet cavity (D) through the axial lubricating fuel channel (Z), partial lubricating oil entering the roller pin fuel channel (X), and partial lubricating oil entering the roller chamber (G) respectively lubricate the roller (4), the roller pin (6), and a spring (7) and a plunger (8) in the tappet cavity (D) in a forced mode automatically; the frictional wear of moving elements is relieved; the service life is prolonged.

Description

technical field [0001] The invention relates to a fuel injection pump for a diesel engine, in particular to a roller lubricating device of an electronically controlled unit pump. Background technique [0002] The electronically controlled unit pump is the second-generation time-controlled fuel pump. The main moving parts are plungers, tappets, and rollers. The rollers are driven by the oil pump cam on the camshaft of the diesel engine, and the tappets move up and down, thereby pushing the piston to move. The fuel is pressurized, resulting in a higher fuel pressure. Since modern new diesel engines require higher fuel injection pressure to meet the requirements of power performance, fuel economy and emission targets, this requires the plunger to provide greater thrust, thereby increasing the load on the rollers and cams. In order to ensure the normal operation of moving parts, good lubrication must be provided, and the heat generated by the movement must be reduced in time. ...

AI Technical Summary

Problems solved by technology

If the design structure and lubrication method are unreasonable, the cams and rollers will quickly wear and ablate, resulting in a decline in the performance of the main engine, or even major failures

In the past, the fuel injection pressure of diesel engines was not high enough, and the load of moving parts was not large enough. The traditional splash lubrication method can still meet the lubrication requirements, but on the electronically controlled unit pump with high fuel injection pressure, the original lubrication method can no longer meet the requirements. New lubrication methods must be studied

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