CN214366484U

CN214366484U - Fuel injection pump upper body

Info

Publication number: CN214366484U
Application number: CN202120007059.9U
Authority: CN
Inventors: 彭琦; 周勇; 扈爽; 吕枫; 田梦江; 欧金桃
Original assignee: Chongqing Hongjiang Machinery Co Ltd
Current assignee: Chongqing Hongjiang Machinery Co Ltd
Priority date: 2021-01-04
Filing date: 2021-01-04
Publication date: 2021-10-08
Anticipated expiration: 2031-01-04

Abstract

The utility model discloses an injection pump upper part of a body, including oil outlet joint, plunger matching parts, the valve module that produces oil, the injection pump body and rack adjustment mechanism, plunger matching parts includes the plunger bushing, the valve module that produces oil includes oil valve and oil valve spring, the inside of the oil outlet joint is provided with and is used for holding the first cavity of oil valve spring, the inside of plunger bushing corresponds the position of first cavity is provided with and is used for holding the second cavity of oil valve, the top of plunger bushing is provided with the annular of undercut, the annular is located the top circumference of second cavity is peripheral, the inside of oil outlet joint is provided with and is used for making the leakage oil duct that annular and fuel tank are linked together. The utility model provides a fuel injection pump upper part of the body can prevent that oil outlet joint and plunger matching parts junction fuel from leaking, prevents that the fuel of leakage from polluting lubricating oil in the fuel injection pump and preventing that lubricating oil from leaking outside the fuel injection pump, and rack adjustment mechanism is spacing reliable, and the single circulation fuel feeding is big.

Description

Fuel injection pump upper body

Technical Field

The utility model relates to a diesel engine technical field, concretely relates to injection pump upper part of the body.

Background

The performance of a diesel engine is greatly affected by the fuel injection system, and the fuel injection pump, which is the most important component in the fuel injection system, directly determines the performance of the fuel injection system. In recent years, as emission regulations become more stringent, diesel engines are required to achieve efficient combustion and ultra-low emissions. Therefore, the fuel injection system must provide higher injection pressures, which requires higher structural strength and better performance of the injection pump. At present, the technology of the fuel injection pump still needs to be further researched and developed, and particularly, the structural strength, the working stability, the service life and the like of the fuel injection pump still need to be continuously improved so as to meet the continuously strengthened requirements of the technical indexes of the diesel engine, for example, the maximum rotating speed of a certain model of diesel engine can reach 1100r/min, and the maximum single-cylinder power can reach 240 kw.

Disclosure of Invention

In view of this, the utility model aims at overcoming the defect among the prior art, provide a fuel injection pump upper part of the body, can prevent that oil outlet joint and plunger matching parts junction fuel from leaking, prevent that the fuel of leakage from polluting lubricating oil and preventing outside the fuel injection pump is leaked to the lubricating oil in the fuel injection pump to rack adjustment mechanism is spacing reliable, and single circulation fuel feeding is big, can satisfy the requirement of the high, the high diesel engine of power of rotational speed to fuel injection pump fuel feeding performance.

The utility model relates to an upper body of an oil injection pump, which comprises an oil outlet joint, a plunger matching part, an oil outlet valve component, an oil injection pump body, a rack adjusting mechanism and a rack limiting pin, the plunger matching part comprises a plunger sleeve, the top of the plunger sleeve is tightly attached to the bottom of the oil outlet joint, the bottom of the plunger sleeve is connected with the oil injection pump body, the rack adjusting mechanism and the rack limiting pin are both arranged on the oil injection pump body, the oil outlet valve assembly comprises an oil outlet valve and an oil outlet valve spring, a first cavity for accommodating the oil outlet valve spring is arranged in the oil outlet joint, a second cavity for accommodating the oil outlet valve is arranged in the plunger sleeve corresponding to the first cavity, the top of the plunger sleeve is provided with a downward-sunken ring groove, the ring groove is positioned on the periphery of the top circumference of the second cavity, and a leakage oil duct used for communicating the annular groove with the fuel tank is arranged in the oil outlet joint.

The oil injection pump body is provided with a limit pin mounting hole, the head end of the limit pin mounting hole is communicated with the rack adjusting mechanism, the tail end of the limit pin mounting hole is communicated with the outside, the rack limit pin is detachably arranged in the limit pin mounting hole, and the head end of the rack limit pin is connected with the rack adjusting mechanism.

And the rack limiting pin is used for limiting the rack limiting pin, a limiting retainer ring is arranged in the retainer ring mounting groove, and the limiting retainer ring is mounted in the retainer ring mounting groove.

Furthermore, a lubricating oil channel is arranged inside the plunger sleeve, an oil inlet of the lubricating oil channel faces the oil injection pump body and is located below an oil inlet and an oil return hole of the plunger sleeve, an oil outlet of the lubricating oil channel faces downwards and is communicated with a middle hole of the oil injection pump body, an upper sealing ring and a lower sealing ring are arranged on the inner wall of the middle hole of the oil injection pump body, the upper sealing ring is located between the oil inlet and return hole of the plunger sleeve, and the lower sealing ring is located between the oil inlet and the rack adjusting mechanism.

And the oil outlet connector also comprises a positioning sleeve which is sleeved at the bottom of the oil outlet connector and the top of the plunger sleeve.

Furthermore, the diameter of the oil outlet valve is phi 12-phi 13mm, and the lift range of the oil outlet valve is 1.5-2.0 mm; the diameter of the plunger and barrel assembly is phi 18 mm-phi 23mm, and the plunger stroke of the plunger and barrel assembly is 14mm-21 mm.

The utility model has the advantages that: the utility model discloses an injection pump upper part of the body can prevent that oil outlet joint and plunger matching parts junction fuel from leaking, prevents that the fuel of leakage from polluting lubricating oil and leaking outside the injection pump in the injection pump to rack adjustment mechanism is spacing reliable, and single circulation fuel feeding is big, can satisfy the requirement of the high, high diesel engine of rotational speed to injection pump fuel feeding capacity performance.

Drawings

The invention will be further described with reference to the following figures and examples:

fig. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic cross-sectional view of the present invention;

FIG. 3 is an enlarged schematic view of FIG. 2 at A;

fig. 4 is a schematic structural view of the oil outlet joint of the present invention;

fig. 5 is a schematic structural diagram of the plunger and barrel assembly of the present invention.

Description of the main reference numerals: 1-oil outlet joint, 11-leakage oil channel, 2-plunger matching part, 21-plunger sleeve, 211-annular groove, 212-lubricating oil channel, 213-oil inlet and outlet hole, 31-oil outlet valve, 32-oil outlet valve spring, 4-oil injection pump body, 41-limit pin mounting hole, 5-rack adjusting mechanism, 51-rack, 6-rack limit pin, 7-limit retainer ring, 81-upper sealing ring, 82-lower sealing ring and 9-locating sleeve.

Detailed Description

As shown in fig. 1 to 5, an injection pump upper body in this embodiment includes an oil outlet joint 1, a plunger matching part 2, an oil outlet valve assembly, an injection pump body 4, a rack adjusting mechanism 5, and a rack limit pin 6, where the plunger matching part 2 includes a plunger sleeve 21, a top of the plunger sleeve 21 is closely attached to a bottom of the oil outlet joint 1, a bottom of the plunger sleeve 21 is connected to the injection pump body 4, both the rack adjusting mechanism 5 and the rack limit pin 6 are mounted on the injection pump body 4, the oil outlet valve assembly includes an oil outlet valve 31 and an oil outlet valve spring 32, a first cavity for accommodating the oil outlet valve spring 32 is disposed inside the oil outlet joint 1, a second cavity for accommodating the oil outlet valve 31 is disposed inside the plunger sleeve 21 corresponding to the first cavity, a downward recessed ring groove 211 is disposed on a top of the plunger sleeve 21, the annular groove 211 is located the top circumference periphery of second cavity, the inside of going out oil joint 1 is provided with and is used for making the leakage oil duct 11 that annular groove 211 and fuel tank are linked together. The bottom of the oil outlet joint 1 is contacted with the top surface of the plunger sleeve 21, the oil outlet joint 1 is tightly pressed on the plunger sleeve 21 through bolts, so that rigid plane high-pressure sealing is realized, high-pressure fuel oil is filled in the first cavity and the second cavity, the rotating speed and the power of the diesel engine are increased, the requirements on the oil outlet joint 1, the plunger sleeve 21 and the connection sealing performance are also improved, the fuel oil can be leaked out of the fuel injection pump from the contact surfaces of the oil outlet joint 1 and the plunger sleeve 21, in the embodiment, by arranging the annular groove 211 and the leakage oil duct 11, when the fuel oil is leaked, the fuel oil can firstly enter the annular groove 211 before leaking out of the fuel injection pump and enters the fuel tank through the leakage oil duct 11, and therefore the fuel oil is prevented from leaking out of the fuel injection pump from the contact surfaces of the oil outlet joint 1 and the plunger sleeve 21.

In this embodiment, the fuel injection pump further includes a rack limit pin 6 for limiting the rack adjustment mechanism 5, a limit pin installation hole 41 is formed in the fuel injection pump body 4, a head end of the limit pin installation hole 41 leads to the rack adjustment mechanism 5, a tail end of the limit pin installation hole 41 is communicated with the outside, the rack limit pin 6 is detachably disposed in the limit pin installation hole 41, and a head end of the rack limit pin 6 is connected to the rack adjustment mechanism 5. The rack adjusting mechanism 5 includes a rack 51, and the position of the rack 51 can be fixed by the rack stopper pin 6 each time after the number of the racks 51 is adjusted.

In this embodiment, the rack limiting pin device further comprises a limiting retainer ring 7 for limiting the rack limiting pin 6, a retainer ring installation groove is formed in the position, corresponding to the tail end of the rack limiting pin 6, of the limiting pin installation hole 41, and the limiting retainer ring 7 is installed in the retainer ring installation groove. The limiting retainer 7 can be a circlip for holes, for example, an A-type circlip for holes in GB/T893.1-1986, when the rack limiting pin 6 is connected with the rack adjusting mechanism 5, the limiting retainer 7 is contracted to reduce the diameter, then the limiting retainer 7 is moved into the retainer mounting groove to loosen the limiting retainer 7, and the limiting retainer 7 is automatically clamped into the retainer mounting groove after being reset, so that the rack limiting pin 6 is axially limited, and the rack limiting pin 6 is prevented from moving towards the outside of the oil injection pump. After the rotational speed and the power increase of diesel engine, the vibration range and the frequency of injection pump also rise, and the conventional mode of fixing a position rack spacer pin 6 through the screw thread can take place gradually along with the vibration of injection pump not hard up, leads to spacing inefficacy even, carries on spacingly, spacing more reliable to rack spacer pin 6 through spacing retaining ring 7 in this embodiment.

In this embodiment, a lubricating oil passage 212 is arranged inside the plunger sleeve 21, an oil inlet of the lubricating oil passage 212 faces the oil injection pump body 4 and is located below an oil inlet and return hole 213 of the plunger sleeve 21, an oil outlet of the lubricating oil passage 212 faces downward and is communicated with a middle hole of the oil injection pump body 4, an upper sealing ring 81 and a lower sealing ring 82 are arranged on an inner wall of the middle hole of the oil injection pump body 4, the upper sealing ring 81 is located between the oil inlet and return hole 213 of the plunger sleeve 21, and the lower sealing ring 82 is located between the oil inlet and the rack adjusting mechanism 5. The upper sealing ring 81 can prevent the fuel oil in the pump cavity from leaking to the lubricating oil inlet and the lubricating oil outlet of the plunger sleeve 21 to pollute the lubricating oil; the lower seal ring 82 prevents the lubricating oil from flowing into the rack adjustment mechanism 5, and thus prevents the lubricating oil from leaking out of the injection pump through the gap between the rack 51 and the injection pump body 4.

In this embodiment, the oil outlet connector further comprises a positioning sleeve 9, and the positioning sleeve 9 is sleeved on the bottom of the oil outlet connector 1 and the top of the plunger sleeve 21. Go out oil joint 1 and plunger bushing 21 and adopt rigid plane high pressure seal's mode, sealing area should not be too big, again because plunger bushing 21's top still is provided with annular 211, so go out remaining space on oil joint 1 and the plunger bushing 21 and be not convenient for adopt the form of locating pin and locating hole to fix a position, consequently can adopt the position sleeve 9 of overcoat to carry out auxiliary positioning, with position sleeve 9 overcoat on plunger bushing 21 during the assembly, dock with plunger bushing 21 in inserting position sleeve 9 with going out oil joint 1 again, not only satisfy structural design's demand, and be convenient for go out oil joint 1 and plunger bushing 21's assembly.

In this embodiment, the diameter of the oil outlet valve 31 is phi 12-phi 13mm, and the lift range of the oil outlet valve 31 is 1.5-2.0 mm; the diameter of the plunger matching part 2 is phi 18 mm-phi 23mm, the plunger stroke of the plunger matching part 2 is 14mm-21mm, and the maximum geometric oil supply amount reaches 2200mm³The circulation can meet the requirements of the diesel engine with high rotating speed and high power on the oil supply capacity performance of the oil injection pump. For example: the maximum rotational speed of a certain model diesel engine can reach 1100r/min, and the maximum single cylinder power can reach 240kw, the utility model discloses can satisfy the performance demand of this model diesel engine.

Finally, 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 present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.

Claims

1. The utility model provides an injection pump upper part of a body, includes oil outlet joint (1), plunger matching parts (2), the valve subassembly that produces oil, the oil injection pump body (4), rack adjustment mechanism (5) and rack spacer pin (6), plunger matching parts (2) include plunger bushing (21), the top of plunger bushing (21) with the bottom of the oil outlet joint (1) closely laminates, the bottom of plunger bushing (21) with the oil injection pump body (4) are connected, rack adjustment mechanism (5) with rack spacer pin (6) are all installed on the oil injection pump body (4), the valve subassembly that produces oil includes oil outlet valve (31) and oil outlet valve spring (32), its characterized in that: the inside of going out oil joint (1) is provided with and is used for holding the first cavity of oil outlet valve spring (32), the inside of plunger sleeve (21) corresponds the position of first cavity is provided with and is used for holding the second cavity of oil outlet valve (31), the top of plunger sleeve (21) is provided with undercut annular (211), annular (211) are located the top circumference of second cavity is peripheral, the inside of going out oil joint (1) is provided with and is used for making leakage oil duct (11) that annular (211) and fuel tank are linked together.

2. The injection pump upper body of claim 1, wherein: the oil injection pump is characterized by further comprising a rack limiting pin (6) used for limiting the rack adjusting mechanism (5), a limiting pin mounting hole (41) is formed in the oil injection pump body (4), the head end of the limiting pin mounting hole (41) is communicated with the rack adjusting mechanism (5), the tail end of the limiting pin mounting hole (41) is communicated with the outside, the rack limiting pin (6) is detachably arranged in the limiting pin mounting hole (41), and the head end of the rack limiting pin (6) is connected with the rack adjusting mechanism (5).

3. The injection pump upper body of claim 2, wherein: the rack limiting pin fixing device is characterized by further comprising a limiting check ring (7) used for limiting the rack limiting pin (6), wherein a check ring mounting groove is formed in the tail end position of the rack limiting pin (6) corresponding to the limiting pin mounting hole (41), and the limiting check ring (7) is mounted in the check ring mounting groove.

4. The injection pump upper body of claim 1, wherein: the inside of plunger bushing (21) is provided with lubricated oil duct (212), the oil inlet orientation of lubricated oil duct (212) spout the oil pump body (4) and be located the below of advancing oil gallery (213) of plunger bushing (21), the oil-out of lubricated oil duct (212) down and with the mesopore of spouting the oil pump body (4) communicates with each other, be provided with on the mesopore inner wall of spouting the oil pump body (4) upper seal circle (81) and lower seal circle (82), upper seal circle (81) are located the oil inlet with between advancing oil gallery (213) of plunger bushing (21), lower seal circle (82) are located the oil inlet with between rack adjustment mechanism (5).

5. The injection pump upper body of claim 1, wherein: the oil outlet connector is characterized by further comprising a positioning sleeve (9), and the positioning sleeve (9) is sleeved on the bottom of the oil outlet connector (1) and the top of the plunger sleeve (21) at the same time.

6. The injection pump upper body of claim 1, wherein: the diameter of the oil outlet valve (31) is phi 12-phi 13mm, and the lift range of the oil outlet valve (31) is 1.5-2.0 mm; the diameter of the plunger and barrel assembly (2) is phi 18 mm-phi 23mm, and the plunger stroke of the plunger and barrel assembly (2) is 14mm-21 mm.