Plunger and barrel assembly of high-pressure fuel injection pump

Abstract

A high-pressure fuel injection pump plunger and barrel assembly comprises a plunger sleeve, the plunger and barrel assembly is arranged in the plunger sleeve, the plunger and barrel assembly comprises a plunger head and a connector, a mounting hole is machined in the bottom of the plunger head, one end of the connector is connected into the mounting hole, a storage space is reserved between the connector and the mounting hole, and lubricating oil is stored in the storage space. A vertical oil hole is formed in the connector and communicated with the storage space, a transverse oil hole is formed in the bottom of the vertical oil hole, an annular groove is formed below the mounting hole and communicated with the annular groove, and a plurality of oil outlet holes are evenly distributed in the periphery of the annular groove and lead to the outer side of the plunger head. Compared with the prior art, the plunger and barrel assembly of the high-pressure fuel injection pump adopts a split structure, the connector part can adopt a casting with lower cost, and meanwhile, lubricating oil is stored in the plunger head and flows out through the oil hole to lubricate the plunger head.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel injection pumps, in particular to a plunger pair of a high-pressure fuel injection pump. Background Art

[0002] A plunger pair is installed in the high-pressure fuel injection pump. Pushed by the camshaft, the plunger pair performs piston motion in the pump body to pump oil. The existing plunger pair is made of high-strength alloy steel through precision machining and chrome-plated on the surface. The processing cycle is long, the manufacturing cost is high, and it is easy to wear. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a high-pressure fuel injection pump plunger pair in view of the deficiencies of the above-mentioned prior art.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0005] A high-pressure fuel injection pump plunger pair comprises a plunger sleeve, wherein the plunger pair is arranged in the plunger sleeve, the plunger pair comprises a plunger head and a connector, a mounting hole is processed at the bottom of the plunger head, one end of the connector is connected to the mounting hole, a storage space is reserved between the connector and the mounting hole, lubricating oil is stored in the storage space, a vertical oil hole is processed on the connector, the vertical oil hole is connected to the storage space, a transverse oil hole is processed at the bottom of the vertical oil hole, an annular groove is processed below the mounting hole, the transverse oil hole is connected to the annular groove, a plurality of oil outlet holes are evenly distributed around the annular groove, and the oil outlet holes lead to the outside of the plunger head.

[0006] Furthermore, a circle of inner groove is processed on the outer side of the plunger head.

[0007] Furthermore, a limit stop ring is processed on the connecting head.

[0008] Furthermore, a connecting baffle is provided at the bottom of the connecting head.

[0009] Compared with the prior art, the utility model provides a high-pressure fuel injection pump plunger pair, the plunger pair adopts a split structure, wherein the connecting head part can adopt a lower-cost casting, and at the same time, lubricating oil is stored inside the plunger head, and the oil is discharged outward through the oil hole to lubricate the plunger head. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of the utility model;

[0011] Figure 2 yes Figure 1 Sectional view at AA in the middle;

[0012] Among them, 1. high-pressure rail, 2. plunger head, 3. connecting head, 4. limit ring, 5. storage space, 6. vertical oil hole, 7. horizontal oil hole, 8. annular groove, 9. oil outlet hole, 10. inner groove. DETAILED DESCRIPTION

[0013] The technical solutions in the embodiments of the present utility model will be described clearly and completely below.

[0014] like Figure 1 and Figure 2 As shown, a high-pressure fuel injection pump plunger pair includes a plunger sleeve 1, the plunger pair is arranged in the plunger sleeve 1, the plunger pair includes a plunger head 2 and a connector 3, the plunger head 2 is made of alloy steel, the surface of the plunger head 2 is chrome-plated after precision grinding, the bottom of the plunger head 2 is processed with a mounting hole, the mounting hole is a screw hole, the connector 3 is a casting, one end of the connector 3 is processed with an external thread, and a connecting baffle is arranged at the bottom, the connector 3 is connected to the mounting hole by a threaded connection, wherein a limit retaining ring 4 is processed on the connector 3, and the limit retaining ring 4 limits the screw-in depth of the connector 3, so that a storage space 5 is formed between the connector 3 and the mounting hole.

[0015] The storage space 5 stores lubricating oil. The connector 3 is provided with a vertical oil hole 6, which is connected to the storage space 5. The lubricating oil in the storage space 5 flows into the vertical oil hole 6. A horizontal oil hole 7 is provided at the bottom of the vertical oil hole 6. An annular groove 8 is provided below the mounting hole, which is connected to the annular groove 8. A plurality of oil outlet holes 9 are evenly distributed around the annular groove 8, and the oil outlet holes 9 lead to the outside of the plunger head. When the plunger pair is working, the lubricating oil in the storage space 5 enters the annular groove 8 through the vertical oil hole 6 and the horizontal oil hole 7, and the oil outlet holes 9 are evenly distributed around the annular groove 8. The discharged lubricating oil lubricates the plunger head 2 to reduce friction resistance.

[0016] The outer side of the plunger head 2 is processed with a circle of inner groove 10, and the inner groove 10 reduces the contact area between the plunger head 2 and the inside of the plunger sleeve 1, and also reduces the friction resistance.

[0017] The present invention is not limited to the described embodiments. Those skilled in the art may make some modifications or changes without departing from the spirit and scope of the present invention, that is, within the scope of disclosure. Therefore, the scope of protection of the present invention shall be subject to the scope defined in the claims.

Claims

1. A high-pressure fuel injection pump plunger pair, comprising a plunger sleeve, wherein the plunger pair is arranged in the plunger sleeve, and characterized in that: The plunger pair includes a plunger head and a connecting head. A mounting hole is processed at the bottom of the plunger head. One end of the connecting head is connected to the mounting hole. A storage space is reserved between the connecting head and the mounting hole. Lubricating oil is stored in the storage space. A vertical oil hole is processed on the connecting head. The vertical oil hole is connected to the storage space. A horizontal oil hole is processed at the bottom of the vertical oil hole. An annular groove is processed below the mounting hole. The horizontal oil hole is connected to the annular groove. A plurality of oil outlet holes are evenly distributed around the annular groove, and the oil outlet holes lead to the outside of the plunger head.

2. A high-pressure fuel injection pump plunger pair according to claim 1, characterized in that: The outer side of the plunger head is processed with a circle of inner groove.

3. A high-pressure fuel injection pump plunger pair according to claim 1, characterized in that: A limit retaining ring is processed on the connecting head.

4. A high-pressure fuel injection pump plunger pair according to claim 1, characterized in that: A connecting baffle is arranged at the bottom of the connecting head.

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