CN217538890U - High-power diesel engine fuel injection pump - Google Patents

Abstract

The utility model discloses a high-power diesel engine fuel injection pump, the isobaric fuel outlet valve component comprises a fuel outlet valve upper seat, a fuel outlet valve, a pressure reducing valve and a fuel outlet valve lower seat, the fuel outlet valve upper seat is designed with a sealing ring groove and a leakage oil groove, the fuel outlet valve lower seat is designed with a high-pressure oil groove; the plunger matching part comprises a plunger and a plunger sleeve, the plunger is provided with an oil groove, and the plunger sleeve is provided with a positioning hole, an oil inlet and return hole and an oil groove; the oil injection pump body is provided with a lubricating oil inlet hole, a leakage oil hole and an observation hole; the rack adjusting mechanism comprises a rack and a gear ring, the rack is provided with a mounting hole, the gear ring is provided with two rows of through holes which are uniformly distributed along the circumferential direction, and the inner wall of the gear ring is provided with a ring groove; the rack positioning screw is designed with a cylindrical boss, and the anti-corrosion screw is designed with a sealing ring groove. The fuel injection pump has the advantages of simple and compact structure, convenience in installation and debugging on the diesel engine, capability of effectively preventing fuel oil and lubricating oil from leaking, sufficient lubrication on moving parts, high reliability, long service life and capability of being suitable for the diesel engine with a single cylinder and high power.

Description

High-power diesel engine fuel injection pump

Technical Field

The utility model relates to a marine diesel engine technical field, concretely relates to high-power diesel engine injection pump.

Background

The fuel injection system is the "heart" of the diesel engine and has a great influence on the performance of the diesel engine. The fuel injection pump is the most important part of the fuel injection system of the diesel engine, and the working condition of the fuel injection system is directly determined by the working condition of the fuel injection pump. In recent years, with the development of diesel engine technology, especially with the continuous improvement of power, the requirement on a fuel injection system of a diesel engine is higher and higher, and the requirement on an injection pump is also improved. However, the existing fuel injection pumps suitable for four-stroke, exhaust gas turbocharging, intercooling and irreversible diesel engines are difficult to adapt to the requirements of the diesel engines, and a plurality of places for further optimization and improvement exist in the aspects of structure, power and other performances. Therefore, the technology of the injection pump still needs to be further researched and developed to meet the development requirement of the diesel engine.

Disclosure of Invention

In order to adapt to the development demand of diesel engine, overcome the not enough of injection pump in the aspect of structure, power and other performance, the utility model provides a high-power diesel engine injection pump, simple structure, compactness, the installation and debugging on the diesel engine is convenient, can effectively prevent that fuel and lubricating oil from leaking, and is abundant to the moving part lubrication, and the reliability is high, long service life to can be suitable for the big diesel engine of single cylinder power.

The technical scheme of the utility model as follows:

the utility model provides a high-power diesel engine injection pump, include:

the device comprises a gland 1, an isobaric oil outlet valve component 2, a plunger and barrel assembly 3 and an oil injection pump body 4;

the plunger matching parts 3 are assembled in the inner cavity of the oil injection pump body 4, and the isobaric oil outlet valve assembly 2 is tightly pressed on the upper sides of the plunger matching parts 3 through the gland 1;

wherein, the outer circle of the isobaric oil outlet valve component 2 facing the oil injection pump body 4 is provided with a leakage oil groove 212;

the oil injection pump body 4 is provided with an oil leakage hole 45, the oil leakage hole 45 is communicated to the right leakage groove 212 through an oil passage, and the oil leakage hole 45 is also communicated to the oil leakage passage of the plunger and barrel assembly 3 through an oil passage.

Preferably, the isobaric oil outlet valve assembly 2 comprises: an oil outlet valve upper seat 21, an oil outlet valve lower seat 24, an oil outlet valve 22 and a pressure reducing valve 23 assembled on the oil outlet valve upper seat 21;

the oil outlet valve lower seat 24 is tightly attached to the upper side of the plunger and barrel assembly 3, a high-pressure oil groove 241 is formed in the lower end face, facing the plunger and barrel assembly 3, of the oil outlet valve lower seat 24, a pressure reducing valve oil duct and an oil outlet valve oil duct which are communicated with the high-pressure oil groove 241 are formed in the oil outlet valve lower seat 24, the pressure reducing valve oil duct is communicated to the pressure reducing valve 23, and the oil outlet valve oil duct is communicated to the oil outlet valve 22;

a first seal ring groove 211 is arranged on the outer circle of the oil outlet valve upper seat 21 facing the oil injection pump body 4;

the upper end of the oil outlet valve upper seat 21 is exposed after penetrating through the gland 1, and conical surface sealing is formed between the oil outlet valve upper seat 21 and the gland 1;

the gland 1 realizes the fastening of the oil outlet valve upper seat 21 and the oil outlet valve lower seat 24 on the upper side of the plunger matching part 3 through the screw connection with the oil injection pump body 4.

Preferably, the plunger and barrel assembly 3 comprises: a plunger 31 and a plunger sleeve 32;

a step surface 41 is formed in the inner cavity of the oil injection pump body 4, and the plunger sleeve 32 is suspended on the step surface 41;

the plunger 31 is slidably inserted from the bottom of the plunger sleeve 32, a low-pressure fuel cavity 42 is formed between the top of the plunger 31 and the plunger sleeve 32, and the position of the low-pressure fuel cavity 42 is lower than that of the step surface 41;

the end face of the plunger sleeve 32 facing the oil injection pump body 4 is provided with a positioning hole 321, the oil injection pump body 4 is provided with a screw hole 43 opposite to the positioning hole 321, and the positioning of the plunger sleeve 32 is realized through a positioning screw 6 screwed in the screw hole 43 and the positioning hole 321.

Preferably, the outer periphery of the plunger 31 is provided with a first oil groove 311 along the axial direction;

the plunger sleeve 32 is provided with an oil inlet and return hole 322 formed by a first hole 322a and a second hole 322b along the radial direction, and a second oil groove 323 is arranged at a port of one side of the first hole 322a close to the center of the plunger sleeve 32;

the oil injection pump body 4 is provided with an anti-corrosion screw 7 opposite to the oil inlet and return hole 322;

when the first oil groove 311 is close to the opening of the first hole 322a, the high-pressure fuel entering the first oil groove 311 through the oil inlet and return hole 322, the second oil groove 323, or the first oil groove 311 flows into the low-pressure fuel chamber 42 through the second oil groove 322 and the oil inlet and return hole 322.

Preferably, the end face of the anti-corrosion screw 7 facing the injection pump body 4 is provided with a second sealing ring groove 71.

Preferably, a hoisting threaded hole 11 is arranged on the upper end surface of the gland 1.

Preferably, the fuel injection pump for a high-power diesel engine further comprises: a rack adjusting mechanism 5 for rotationally adjusting the plunger 31;

the rack adjusting mechanism 5 comprises a rack 51 and a gear ring 52, the rack 51 is installed in a mounting hole of the oil injection pump body 4, the gear ring 52 is installed in an inner cavity of the oil injection pump body 4, part of the gear ring 52 is sleeved on the plunger sleeve 32, and the rack 51 is meshed with the gear ring 52;

a plurality of first through holes 521 and a plurality of second through holes 522 are uniformly distributed on the outer circle of the gear ring 52, and the positions of the first through holes 521 are higher than the positions of the second through holes 522;

a ring groove 523 for communicating the first through hole 521 with the second through hole 522 is formed on the inner wall of the ring gear 52;

the oil injection pump body 4 is provided with a lubricating oil inlet hole 44, lubricating oil enters the inner cavity of the oil injection cavity 4 through the lubricating oil inlet hole 44, enters the annular groove 523 through the first through hole 521, lubricates the plunger sleeve 32 and the gear ring 52, and flows into the cam box through the second through hole 522.

Preferably, the rack 51 is provided with a mounting hole 511 for connection with an adjusting mechanism of the diesel engine.

Preferably, the diameter of the oil outlet valve 22 is phi 15-20 mm, and the lift of the oil outlet valve 22 is 1.3-1.6 mm; the diameter of the plunger 31 is phi 32-phi 36mm, and the stroke of the plunger 31 is 30-35 mm; the fuel injection pump of the high-power diesel engine is suitable for a diesel engine with a single cylinder power of 600-700 KW.

Preferably, the injection pump body 4 is provided with an observation hole 46 for observing an oil supply start point line provided on the plunger 31, and the injection pump body 4 is further provided with a cover plate 8 for preventing the lubricating oil from flowing out of the observation hole 46.

The beneficial effects of the utility model are as follows:

1. the end face of the gland far away from one side of the conical surface is provided with a hoisting threaded hole, so that the installation of the fuel injection pump on the diesel engine is facilitated.

2. The oil outlet valve upper seat is designed with a first sealing ring groove, a sealing ring can be arranged in the first sealing ring groove, and fuel oil leakage is prevented.

3. The end surface of the oil outlet valve upper seat facing the oil injection pump body is provided with a leakage oil groove, the outer diameter of the oil outlet valve lower seat is smaller than that of the oil outlet valve upper seat, and the leakage oil groove, the oil outlet valve lower seat and the inner wall of the oil injection pump body form a leakage oil cavity so as to facilitate collection of leakage oil.

4. The end face of the lower oil outlet valve seat, which is far away from one side of the pressure reducing valve mounting hole, is provided with a high-pressure oil groove, and the high-pressure oil groove is communicated with the oil outlet hole of the plunger sleeve and the two high-pressure oil holes in the lower oil outlet valve seat, so that the arrangement space of the oil holes is saved, and the structure is simpler and more compact.

5. Each oil inlet and return hole of the plunger sleeve is composed of two holes with different diameters. The diameter of the first hole close to the center of the plunger sleeve is smaller than that of the second hole close to the external space, so that the orifice of the plunger sleeve entering the oil return hole close to the external space is prevented from cavitation corrosion, and the orifice of one side close to the center of the plunger sleeve is provided with a second oil groove for preventing the orifice from cavitation corrosion.

6. The step surface in the inner cavity of the oil injection pump body is higher than the low-pressure fuel cavity, so that the oil injection pump is convenient to assemble; the position of a lubricating oil inlet hole of the oil injection pump body faces to the gear ring, so that the rack adjusting mechanism can be fully lubricated, meanwhile, the gear ring is provided with an upper row of first through holes and a lower row of first through holes, and the inner wall of the gear ring is provided with annular grooves communicated with the two rows of second through holes, so that lubricating oil can form a loop and finally flows into the cam box; the oil injection pump body is provided with a leakage oil hole, and fuel oil in a leakage oil cavity formed by a leakage oil groove, an oil outlet valve lower seat and the inner wall of the oil injection pump body and leakage oil in the plunger matching part can flow out of the oil injection pump through the leakage oil hole; the oil injection pump body is provided with an observation hole, an oil supply starting point reticle can be observed, the installation and the adjustment of the oil injection pump on the diesel engine are facilitated, and the cover plate is installed at the position of the observation hole and can prevent lubricating oil from flowing out of the observation hole.

7. The rack is provided with a mounting hole which is convenient to be connected with an adjusting mechanism on the diesel engine.

8. The positioning screw is used for positioning the plunger sleeve, so that the plunger sleeve is prevented from rotating.

9. The anti-corrosion screw is provided with a second sealing ring groove, a sealing ring can be arranged in the second sealing ring groove, and fuel oil leakage is prevented.

10. The diameter of the oil outlet valve is phi 15-20 mm, and the lift range of the oil outlet valve is 1.3-1.6 mm; the diameter of the plunger is phi 32-phi 36mm, the stroke of the plunger is 30-35 mm, and the fuel injection pump can be suitable for a diesel engine with single cylinder power of 600-700 KW.

Drawings

The invention is further described below with reference to the drawings and embodiments:

fig. 1 is a sectional view of an injection pump of the present embodiment;

fig. 2 is a sectional view of the fuel injection pump of the present embodiment;

fig. 3 is a partial schematic view of the injection pump of the present embodiment;

FIG. 4 is a schematic view of the gland of the present embodiment;

FIG. 5 is a cross-sectional view of the isobaric oil valve assembly of the present embodiment;

FIG. 6 is a sectional view of the plunger and barrel assembly of the present embodiment;

FIG. 7 is a schematic view of a plunger barrel according to the present embodiment;

fig. 8 is a sectional view of the oil jet pump body of the present embodiment;

fig. 9 is a schematic view of the oil jet pump body of the present embodiment;

fig. 10 is a schematic view of a rack of the present embodiment;

FIG. 11 is a schematic view of a ring gear of the present embodiment;

FIG. 12 is a schematic view of a set screw according to the present embodiment;

FIG. 13 is a schematic view of an erosion screw of the present embodiment;

in the figure: 1-a gland, 11-a hoisting threaded hole, 2-an isobaric oil outlet valve component, 21-an oil outlet valve upper seat, 211-a first sealing ring groove, 212-a leakage oil groove, 22-an oil outlet valve, 23-a pressure reducing valve, 24-an oil outlet valve lower seat, 241-a high-pressure oil groove, 3-a plunger matching part, 31-a plunger, 311-a first oil groove, 32-a plunger sleeve, 321-a positioning hole, 322-an oil inlet and return hole, 322 a-a first hole, 322 b-a first hole, 323-a first oil groove, 4-an oil injection pump body, 41-a step surface, 42-a low-pressure fuel oil cavity, 43-a screw hole, 44-a lubricating oil inlet hole, 45-an oil leakage hole, 46-an observation hole, 5-a rack adjusting mechanism, 51-a rack, 511-a mounting hole, 52-a gear ring, 521-a through hole, 522-a through hole, 523-a ring groove, 6-a plunger sleeve positioning screw, 61-a boss, 7-an anti-corrosion screw, 71-a second sealing ring groove and an 8-a cover plate.

Detailed Description

The structure and operation of the present invention will be further described in detail with reference to the accompanying drawings and examples.

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. Examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like are used in the orientations and positional relationships indicated in the drawings, which are based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

As shown in fig. 1, in this embodiment, an injection pump for a high-power diesel engine includes a gland 1, an isobaric oil outlet valve assembly 2, a plunger and barrel assembly 3, an injection pump body 4, and a rack adjusting mechanism 5. The plunger and barrel assembly 3 comprises a plunger 31 and a plunger sleeve 32, and the plunger and barrel assembly 3 is installed in the inner cavity of the oil injection pump body 4.

Referring to fig. 5, the isobaric oil outlet valve assembly 2 comprises an oil outlet valve upper seat 21, an oil outlet valve 22, a pressure reducing valve 23 and an oil outlet valve lower seat 24, wherein the oil outlet valve upper seat 21, the oil outlet valve 22, the pressure reducing valve 23 and the oil outlet valve lower seat 24 are connected into a whole through screws between the oil outlet valve upper seat 21 and the oil outlet valve lower seat 24, and the lower end surface of the oil outlet valve lower seat 24 is tightly attached to the upper end surface of the plunger sleeve 32.

Referring to fig. 1 and 2, the gland 1 is tightly attached to the oil outlet valve upper seat 21, and the gland 1 is connected to the oil injection pump body 4 through screws.

Referring to fig. 10 and 11, the rack adjustment mechanism 5 includes a rack 51 and a ring gear 52, the rack 51 is mounted in a mounting hole of the injection pump body 4, the ring gear 52 is mounted in an inner cavity of the injection pump body 4, and the rack 51 and the ring gear 52 are engaged.

Referring to fig. 8, a stepped surface 41 is designed in an inner cavity of the injection pump body 4, the injection pump body 4 is designed with a low-pressure fuel cavity 42, the position of the stepped surface 41 is higher than that of the low-pressure fuel cavity 42, and the plunger sleeve 32 is hung on the stepped surface 41.

By screwing the screw for connecting the gland 1 and the oil injection pump body 4, the upper conical surface of the gland 1 is pressed against the lower conical surface of the oil outlet valve upper seat 21, so that the isobaric oil outlet valve assembly 2 and the plunger matching part 3 are pressed in the inner cavity of the oil injection pump body 4.

As shown in fig. 4, a lifting threaded hole 11 is designed on the end surface of the gland 1 away from the lower conical surface.

As shown in fig. 1, 2 and 3, the outlet valve upper seat 21 is designed with a first seal ring groove 211; the outlet valve upper seat 21 is designed with a leakage oil groove 212.

As shown in fig. 1 and 2, an end surface of the oil outlet valve lower seat 24 on the side away from the mounting hole of the pressure reducing valve 23 is designed with a high-pressure oil groove 241, and fuel enters the oil outlet valve 22 after entering the high-pressure oil groove 241 from the plunger sleeve 32 or enters the plunger sleeve 32 after entering the high-pressure oil groove 241 from the pressure reducing valve 23; the diameter of the outlet valve lower seat 24 is smaller than that of the outlet valve upper seat 21.

As shown in fig. 1 and 6, the plunger 31 is designed with a first oil groove 311; the plunger sleeve 32 is provided with a positioning hole 321; the plunger sleeve 32 is provided with an oil inlet and return hole 322 which is composed of a first hole 322a and a second hole 322b, and the diameter of the second hole 322b is larger than that of the hole 322 a; an orifice of the side of the hole 322a close to the center of the plunger sleeve 32 is designed with a second oil groove 323, when the first oil groove 311 is close to the orifice of the first hole 322a, the fuel can enter the first oil groove 311 through the oil inlet and return hole 322, the second oil groove 323, or the high-pressure fuel in the first oil groove 311 can flow into the low-pressure fuel chamber 42 through the second oil groove 323 and the oil inlet and return hole 322.

As shown in fig. 1, the oil injection pump body 4 is further designed with a screw hole 43, the screw hole 43 is disposed opposite to the positioning hole 321, and the positioning screw 6 is assembled in the screw hole 43 and the positioning hole 321 to position the plunger sleeve 32 and prevent the plunger sleeve from rotating.

As shown in fig. 1 and 6, the injection pump body 4 is further designed with a lubricant inlet 44, and the lubricant inlet 44 is located opposite to the ring gear 52; the oil injection pump body 4 is further designed with an oil leakage hole 45, the oil leakage hole 45 is communicated with an oil leakage cavity formed by the oil leakage groove 212, the oil outlet valve lower seat 24 and the inner wall of the oil injection pump body 4, the oil leakage hole 45 is communicated with an oil leakage hole on the plunger sleeve 32, and the oil leakage hole 45 is communicated with an external space; the injection pump body 4 is also provided with an observation opening 46.

As shown in fig. 10 and 11, the rack 51 is designed with a mounting hole 511 to connect with an adjusting mechanism on the diesel engine; the ring gear 52 is provided with M first through holes 521 uniformly distributed along the circumferential direction, the ring gear 52 is provided with N second through holes 522 uniformly distributed along the circumferential direction, and the positions of the first through holes 521 are higher than the positions of the second through holes 522; the inner wall of the ring gear 52 is designed with a ring groove 523 communicating the first through hole 521 and the second through hole 522, and lubricating oil enters the inner cavity of the oil injection pump body 4 from the lubricating oil inlet 44 to lubricate the rack adjusting mechanism 5, then enters an oil cavity formed by the ring groove 523 and the plunger sleeve 32 from the first through hole 521, flows downwards through the second through hole 522, and finally enters the cam box.

As shown in fig. 12, the plunger sleeve positioning screw device further includes a plunger sleeve positioning screw 6, the plunger sleeve positioning screw 6 is designed with a cylindrical boss 61, the plunger sleeve positioning screw 6 is screwed into the screw hole 43, and the cylindrical boss 61 enters the positioning hole 321 to position the plunger sleeve 32.

As shown in fig. 13, an anti-corrosion screw 7 is further included, and the anti-corrosion screw 7 is designed with a second seal ring groove 71.

As shown in fig. 2, the oil-lubricating device further comprises a cover plate 8, wherein the cover plate 8 is installed at the position of the observation hole 46 and prevents the lubricating oil from flowing out of the observation hole 46.

In this embodiment, the diameter of the oil outlet valve 22 is phi 15-phi 20mm, and the lift range of the oil outlet valve 22 is 1.3-1.6 mm; the diameter of the plunger 31 is phi 32-phi 36mm, the stroke of the plunger 31 is 30-35 mm, and the fuel injection pump is suitable for a diesel engine with single cylinder power of 600-700 KW.

Finally, it is noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the scope of the claims of the present invention.

Claims (10)

1. The utility model provides a high-power diesel engine injection pump which characterized in that includes:

the oil pump comprises a gland (1), an isobaric oil outlet valve component (2), a plunger matching part (3) and an oil injection pump body (4);

the plunger matching parts (3) are assembled in the inner cavity of the oil injection pump body (4), and the isobaric oil outlet valve assembly (2) is tightly pressed on the upper sides of the plunger matching parts (3) through the gland (1);

the outer circle of the isobaric oil outlet valve component (2) facing the oil injection pump body (4) is provided with an oil leakage groove (212);

the oil injection pump body (4) is provided with an oil leakage hole (45), the oil leakage hole (45) is communicated to the right leakage groove (212) through an oil duct, and the oil leakage hole (45) is also communicated to a leakage oil duct of the plunger matching part (3) through an oil duct.

2. The high power diesel injection pump of claim 1, wherein the isobaric delivery valve assembly (2) comprises: an oil outlet valve upper seat (21), an oil outlet valve lower seat (24), an oil outlet valve (22) and a pressure reducing valve (23) assembled on the oil outlet valve upper seat (21);

the oil outlet valve lower seat (24) is tightly attached to the upper side of the plunger and barrel assembly (3), a high-pressure oil groove (241) is formed in the lower end face, facing the plunger and barrel assembly (3), of the oil outlet valve lower seat (24), a pressure reducing valve oil passage and an oil outlet valve oil passage which are communicated with the high-pressure oil groove (241) are formed in the oil outlet valve lower seat (24), the pressure reducing valve oil passage is communicated to a pressure reducing valve (23), and the oil outlet valve oil passage is communicated to the oil outlet valve (22);

a first seal ring groove (211) is formed in the outer circle, facing the oil injection pump body (4), of the oil outlet valve upper seat (21);

the upper end of the oil outlet valve upper seat (21) penetrates through the gland (1) and then is exposed, and conical surface sealing is formed between the oil outlet valve upper seat (21) and the gland (1);

the gland (1) realizes the fastening of the oil outlet valve upper seat (21) and the oil outlet valve lower seat (24) on the upper side of the plunger matching part (3) by being in threaded connection with the oil injection pump body (4).

3. The high power diesel injection pump of claim 2, wherein the plunger and barrel assembly (3) comprises: a plunger (31) and a plunger sleeve (32);

a step surface (41) is formed in the inner cavity of the oil injection pump body (4), and the plunger sleeve (32) is suspended on the step surface (41);

the plunger (31) is inserted into the plunger sleeve (32) in a sliding mode from the bottom of the plunger sleeve, a low-pressure fuel cavity (42) is formed between the top of the plunger (31) and the plunger sleeve (32), and the position of the low-pressure fuel cavity (42) is lower than that of the step surface (41);

the end face, facing the oil injection pump body (4), of the plunger sleeve (32) is provided with a positioning hole (321), the oil injection pump body (4) is provided with a screw hole (43) opposite to the positioning hole (321), and the plunger sleeve (32) is positioned through a positioning screw (6) screwed in the screw hole (43) and the positioning hole (321).

4. The fuel injection pump for high power diesel engines of claim 3,

a first oil groove (311) is formed in the outer periphery of the plunger (31) along the axial direction;

an oil inlet and return hole (322) formed by a first hole (322) a and a second hole (322) b is formed in the plunger sleeve (32) along the radial direction, and a second oil groove (323) is formed in the position, close to the hole opening on one side of the center of the plunger sleeve (32), of the first hole (322) a;

an anti-corrosion screw (7) opposite to the oil inlet and return hole (322) is assembled on the oil injection pump body (4);

when the first oil groove (311) is close to the opening of the first hole (322) a, the high-pressure fuel entering the first oil groove (311) or the first oil groove (311) through the oil inlet and return hole (322) and the second oil groove (323) flows into the low-pressure fuel cavity (42) through the second oil groove (322) and the oil inlet and return hole (322).

5. The high-power diesel injection pump according to claim 4, characterized in that the end face of the anti-corrosion screw (7) facing the injection pump body (4) is provided with a second sealing ring groove (71).

6. The high-power diesel injection pump according to claim 1, characterized in that the upper end face of the gland (1) is provided with a hoisting threaded hole (11).

7. The high power diesel injection pump of claim 3, further comprising: a rack adjusting mechanism (5) for rotationally adjusting the plunger (31);

the rack adjusting mechanism (5) comprises a rack (51) and a gear ring (52), the rack (51) is installed in an installation hole of the oil injection pump body (4), the gear ring (52) is installed in an inner cavity of the oil injection pump body (4), part of the gear ring (52) is sleeved on the plunger sleeve (32), and the rack (51) is meshed with the gear ring (52);

a plurality of first through holes (521) and a plurality of second through holes (522) are uniformly distributed on the excircle of the gear ring (52), and the positions of the first through holes (521) are higher than the positions of the second through holes (522);

an annular groove (523) for communicating the first through hole (521) with the second through hole (522) is formed in the inner wall of the gear ring (52);

be provided with lubricating oil inlet hole (44) on the oil spout pump body (4), lubricating oil enters into the inner chamber of oil spout cavity (4) through lubricating oil inlet hole (44), and rethread first through-hole (521) enters into annular (523), lubricates plunger sleeve (32) and ring gear (52), and rethread second through-hole (522) flow into in the cam case.

8. The high-power diesel injection pump of claim 7, characterized in that the rack (51) is provided with mounting holes (511) for connection with the adjusting mechanism of the diesel engine.

9. The fuel injection pump of the high-power diesel engine as claimed in claim 3, characterized in that the diameter of the fuel outlet valve (22) is phi 15-phi 20mm, and the lift of the fuel outlet valve (22) is 1.3-1.6 mm; the diameter of the plunger (31) is phi 32-phi 36mm, and the stroke of the plunger (31) is 30-35 mm; the fuel injection pump of the high-power diesel engine is suitable for a diesel engine with a single cylinder power of 600-700 KW.

10. The fuel injection pump for high power diesel engine according to claim 3, wherein the fuel injection pump body (4) is provided with an observation hole (46) for observing a line of an oil supply starting point provided on the plunger (31), and the fuel injection pump body (4) is further provided with a cover plate (8) for preventing the lubricating oil from flowing out of the observation hole (46).

Images