High-power fuel injection pump plunger and barrel assembly lubricating structure

Abstract

A high-power fuel injection pump plunger and barrel assembly lubricating structure comprises a fuel injection pump body, a plunger seat is connected to the fuel injection pump body, an oil inlet hole and an oil outlet hole are formed in the two sides of the upper portion of the plunger seat respectively, a plunger hole is formed in the middle of the plunger seat, a plunger and barrel assembly is arranged in the plunger hole, an annular groove is formed in the side face of the plunger hole, and an oil storage ring is arranged in the annular groove. An oil injection needle hole is machined in the plunger seat and communicated with the oil storage ring, and an oil injection hole is machined in the oil injection pump body and communicated with the oil injection needle hole. Compared with the prior art, according to the high-power fuel injection pump plunger and barrel assembly lubricating structure, the oil storage ring is arranged in the plunger hole, long-time oil storage is achieved through the oil storage ring, meanwhile, the oil injection opening is formed in the side face of the pump body, and lubricating oil can be injected conveniently.

Description

Technical Field

[0001] This utility model relates to the field of fuel injection pump technology, specifically to a lubrication structure for a high-power fuel injection pump plunger assembly. Background Technology

[0002] The fuel injection pump has a plunger assembly installed inside. The plunger assembly moves like a piston within the pump body to pump oil. The surface of the plunger assembly is highly polished and precisely fits into the plunger bore within the pump body. At the same time, lubricating oil is applied between the plunger assembly and the plunger bore, forming an oil film that serves both lubrication and prevents fuel leakage. However, after the fuel injection pump has been working for a period of time, the lubricating oil will decrease, so it is necessary to replenish the lubricating oil. For example, Chinese patent CN219774246U, entitled "A High-Efficiency Lubricated Direct Injection Fuel Pump", has an annular oil reservoir machined around the plunger assembly. The plunger seat and the fuel injection pump body have oil filling holes that are aligned with the annular oil reservoir. It is very convenient to add lubricating oil through the oil filling hole on the side of the fuel injection pump. However, the structure of the annular oil reservoir is not conducive to storing lubricating oil for a long time. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a lubrication structure for a high-power fuel injection pump plunger assembly, addressing the shortcomings of the prior art.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] A lubrication structure for a high-power fuel injection pump plunger assembly includes a fuel injection pump body, a plunger seat connected to the pump body, an oil inlet and an oil outlet respectively machined on both sides of the upper part of the plunger seat, a plunger hole machined in the middle of the plunger seat, a plunger assembly disposed in the plunger hole, an annular groove machined on the side of the plunger hole, an oil reservoir ring disposed in the annular groove, an oil injection needle hole machined on the plunger seat and communicating with the oil reservoir ring, and an oil injection hole machined on the fuel injection pump body and communicating with the oil injection needle hole.

[0006] Furthermore, the annular groove has shoulders machined on both sides of the groove opening to hold the oil storage ring in place.

[0007] Furthermore, the oil storage ring is made of sponge or felt.

[0008] Furthermore, a rubber plug is provided inside the oil injection hole, and a plug hole is machined on the outside of the oil injection hole opening, with a plug screw installed inside the plug hole to press the rubber plug in place.

[0009] Furthermore, a sealing ring is provided between the plunger seat and the fuel injection pump body.

[0010] Compared with the prior art, the lubrication structure of the plunger assembly of the high-power fuel injection pump of this utility model is provided with an oil reservoir ring in the plunger hole to achieve long-term oil storage, and an oil injection port is provided on the side of the pump body for convenient injection of lubricating oil. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model;

[0012] The components are: 1. Injection pump body; 2. Plunger seat; 3. Oil inlet; 4. Oil outlet; 5. Plunger assembly; 6. First seal ring; 7. Oil reservoir ring; 8. Shoulder; 9. Second seal ring; 10. Injection needle hole; 11. Rubber plug; 12. Plug screw. Detailed Implementation

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

[0014] like Figure 1 As shown, a high-power fuel injection pump plunger assembly lubrication structure includes a fuel injection pump body 1, a plunger seat 2 disposed on the fuel injection pump body 1, the upper end of the plunger seat 2 being fixed to the fuel injection pump body 1 by bolts and washers, an oil inlet hole 3 and an oil outlet hole 4 respectively machined on the upper two sides of the plunger seat 2, a plunger hole machined in the middle of the plunger seat 2, and a plunger assembly 5 disposed in the plunger hole, the plunger assembly 5 performing piston movement within the plunger hole to pump oil.

[0015] A sealing ring 6 is provided between the plunger seat 2 and the fuel injection pump body 1. The sealing ring 6 is located above and below the fuel inlet 3 and the fuel outlet 4 to prevent fuel leakage.

[0016] The plunger hole has an annular groove machined on its side, and an oil storage ring 7 is provided in the annular groove. In this embodiment, the oil storage ring 7 is made of sponge or felt to facilitate long-term storage of lubricating oil.

[0017] The annular groove 7 has shoulders 8 machined on both sides of the groove opening. The shoulders 8 and the annular groove form a "T" shaped structure to facilitate locking the oil storage ring 7.

[0018] A sealing ring 2 9 is provided between the plunger seat 2 and the oil injection pump body 1. The sealing ring 2 9 is located below the oil reservoir ring 7 to prevent lubricating oil leakage.

[0019] The plunger seat 2 is machined with an oil injection needle hole 10. The oil injection needle hole 10 has a small diameter, which can prevent leakage. The oil injection needle hole 10 is connected to the oil reservoir ring. The injection pump body 1 is machined with an oil injection hole, which is connected to the oil injection needle hole 10. A rubber plug 11 is installed in the oil injection hole to block the oil injection hole. A plug hole is machined on the outside of the oil injection hole opening, and a plug screw 12 is installed in the plug hole to press the rubber plug 11.

[0020] This utility model is not limited to the embodiments described. Those skilled in the art can still make some modifications or changes without departing from the spirit and scope of this utility model. Therefore, the scope of protection of this utility model shall be determined by the scope defined in the claims.

Claims

1. A high-power fuel injection pump plunger pair member lubricating structure, comprising a fuel injection pump body, a plunger seat is connected to the fuel injection pump body, oil inlet holes and oil outlet holes are respectively machined on both sides above the plunger seat, a plunger hole is machined in the middle of the plunger seat, and a plunger pair member is arranged in the plunger hole, characterized in that: The annular groove is provided with an oil storage ring, the plunger seat is provided with an oil injection needle hole, the oil injection needle hole is communicated with the oil storage ring, the pump body of the fuel injection pump is provided with an oil injection hole, and the oil injection hole is communicated with the oil injection needle hole. ​ 2. A lubricating structure of a high-power fuel injection pump plunger pair according to claim 1, characterized in that: The annular groove is provided with a shoulder on both sides of the groove opening.

3. A lubrication structure for a high-power fuel injection pump plunger pair according to claim 1 or 2, characterized in that: The oil storage ring is made of sponge or felt.

4. A lubrication structure for a high-power fuel injection pump plunger pair according to claim 1, characterized in that: The oil injection hole is provided with a rubber plug, the oil injection hole is provided with a plug hole outside the hole opening, and a plug screw is installed in the plug hole to press the rubber plug.

5. A lubrication structure for a high-power fuel injection pump plunger pair according to claim 1, characterized in that: The plunger seat and the pump body of the fuel injection pump are provided with a sealing ring.

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