CN218151210U - Plunger and barrel assembly of fuel injection pump and fuel injection pump thereof - Google Patents
Plunger and barrel assembly of fuel injection pump and fuel injection pump thereof Download PDFInfo
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- CN218151210U CN218151210U CN202221746948.8U CN202221746948U CN218151210U CN 218151210 U CN218151210 U CN 218151210U CN 202221746948 U CN202221746948 U CN 202221746948U CN 218151210 U CN218151210 U CN 218151210U
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- plunger
- pressure regulating
- injection pump
- regulating groove
- groove
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Abstract
The utility model discloses a plunger matching parts of injection pump and injection pump thereof belongs to diesel engine technical field, be equipped with the plunger in the plunger bushing, seted up into the oil gallery on the plunger bushing, spiral grooving and straight grooving have been seted up on the periphery of plunger head, clearance pressure regulating groove has been seted up on the periphery of plunger head, clearance pressure regulating groove extends and communicates mutually with spiral grooving along the periphery circumference of plunger head, clearance pressure regulating groove and plunger top surface parallel arrangement, clearance pressure regulating groove is located the effective oil supply stroke plunger department that corresponds when the diesel engine is 80% ~ 90% load. When the load of the diesel engine is below 80%, the gap pressure regulating groove does not play a role in regulating pressure. When the load of the diesel engine is more than 80%, the plunger continuously moves upwards to a certain position, the gap pressure regulating groove is firstly communicated with the oil inlet and return hole to partially release pressure by rotating the plunger, so that the pressure is prevented from exceeding the limit during oil supply, the plunger continuously moves upwards to the spiral oblique cutting groove to be communicated with the oil inlet and return hole to continuously release pressure, and the reliability of a fuel system is ensured.
Description
Technical Field
The utility model belongs to the technical field of the diesel engine, concretely relates to plunger matching parts of fuel injection pump and fuel injection pump thereof.
Background
The fuel injection pump comprises a plunger matching part and an oil outlet valve, the plunger matching part is provided with a plunger sleeve and a plunger, the upper end of the plunger sleeve is connected with the oil outlet valve, high-pressure fuel enters the plunger sleeve through an oil inlet pipe, the plunger in the plunger sleeve moves up and down to enable the high-pressure fuel in the plunger sleeve to enter the oil outlet valve, and the high-pressure fuel in the oil outlet valve is quantitatively and regularly supplied to an engine through an oil outlet channel to meet the working requirements of the engine.
In the operation process of a diesel engine, in order to improve low-speed performance, in a fuel oil system, the pressure of a low-speed pump end is often increased by increasing the oil supply rate of a plunger or increasing the diameter of the plunger, but after the oil supply rate is increased, the problems of over-limit of the pressure of the pump end and the pressure of an oil pipe can occur under high-speed and large loads, and the reliability of an oil supply system is difficult to guarantee.
SUMMERY OF THE UTILITY MODEL
The above-mentioned defect to prior art, the utility model aims to solve the technical problem that a plunger matching parts of injection pump is provided, the problem that pump end pressure and oil pipe pressure that appear under the high-speed heavy load transfinite can be solved, the oil feeding system reliability has been guaranteed.
In order to solve the technical problem, the utility model discloses a following technical scheme:
plunger matching parts of injection pump, including plunger bushing and plunger, seted up into the oil gallery on the plunger bushing, the plunger is equipped with the plunger head, seted up spiral oblique slot and straight slot on the periphery of plunger head, its characterized in that:
the plunger piston is characterized in that a gap pressure regulating groove is formed in the circumferential surface of the plunger piston head, the gap pressure regulating groove extends along the circumferential direction of the plunger piston head and is communicated with the spiral bevel groove, the gap pressure regulating groove is parallel to the top surface of the plunger piston, and the gap pressure regulating groove is located at the corresponding effective oil supply stroke plunger piston when the diesel engine is under 80% -90% of load.
Preferably, the groove depth of the gap pressure regulating groove is 1 mm-1.5 mm.
Preferably, the cross section of the gap pressure regulating groove is semicircular.
Preferably, the diameter of the through-flow section of the gap pressure regulating groove is phi 1.5 mm-phi 2mm.
Preferably, the plunger comprises a plunger rod part positioned below the plunger head part, and the plunger rod part is provided with an annular oil groove.
An injection pump, includes above-mentioned injection pump's plunger and barrel assembly.
After the technical scheme is adopted, the beneficial effects of the utility model are that:
the utility model discloses a plunger matching parts of injection pump, including plunger bushing and plunger, seted up into the oil gallery on the plunger bushing, the plunger is equipped with the plunger head, seted up spiral grooving and straight cutting groove to one side on the periphery of plunger head, seted up clearance pressure regulating groove on the periphery of plunger head, clearance pressure regulating groove extends and communicates mutually with spiral grooving along the periphery of plunger head, clearance pressure regulating groove and plunger top surface parallel arrangement, clearance pressure regulating groove is located the effective oil supply stroke plunger department that corresponds when the diesel engine is 80% ~ 90% load. When the load of the diesel engine is below 80%, the gap pressure regulating groove does not play a role in regulating pressure. The gap pressure regulating groove is not communicated with the oil inlet and return hole, the high-pressure fuel cavity can obtain higher pressure, the system injection pressure is higher, the performance of low load in the diesel engine is improved, and the fuel consumption rate and the emission of CH and PM can be obviously improved.
When the load of the diesel engine is more than 80%, the plunger continuously moves upwards to a certain position and then rotates, at the moment, the gap pressure regulating groove is firstly communicated with the oil inlet and return hole to partially relieve pressure, the pressure is prevented from exceeding the limit during oil supply, the plunger continuously moves upwards to the spiral inclined cutting groove to be communicated with the oil inlet and return hole, and the pressure is continuously relieved. The pressure is a process of gradually reducing, the pressure of a high-pressure cavity with the load of more than 80 percent is prevented from exceeding the limit, and the reliability of a fuel system is further ensured.
Drawings
FIG. 1 is a schematic diagram of a plunger and barrel assembly of an injection pump according to the present invention;
FIG. 2 is a schematic view of a gap pressure regulating groove of a plunger matching part of the fuel injection pump of the present invention communicating with an oil inlet and an oil return hole;
FIG. 3 is a first schematic structural view of the plunger of FIG. 1;
FIG. 4 is a second schematic structural view of the plunger of FIG. 1;
in the figure: 1. a plunger sleeve; 101. an oil inlet and return hole; 2. a plunger; 201. a plunger head; 202. spirally and obliquely cutting grooves; 203. cutting a groove directly; 204. a gap pressure regulating groove; 205. a plunger rod portion; 206. an annular oil groove; 3. the high-pressure oil chamber.
Detailed Description
The following detailed description of the embodiments of the present invention will be provided in conjunction with the accompanying drawings and specific embodiments for further understanding the objects, aspects and functions of the present invention, but not for limiting the scope of the appended claims.
The plunger and barrel assembly of the oil injection pump shown in fig. 1 to 4 comprises a plunger sleeve 1 and a plunger 2, wherein an oil inlet and return hole 101 is formed in the plunger sleeve 1, the plunger is provided with a plunger head 201, a spiral oblique cutting groove 202 and a straight cutting groove 203 are formed in the circumferential surface of the plunger head 201, and an oil discharge cavity is formed between the spiral oblique cutting groove 202 and the straight cutting groove 203 and the inner wall of the plunger sleeve 1.
As shown in fig. 3 and 4, a gap pressure-regulating groove 204 is formed on the circumferential surface of the plunger head 201, the gap pressure-regulating groove 204 extends along the circumferential surface of the plunger head 201 in the circumferential direction and is communicated with the spiral oblique cutting groove 202, the gap pressure-regulating groove 204 is arranged in parallel with the top surface of the plunger 2, and the gap pressure-regulating groove 204 is located at the plunger in the effective oil supply stroke corresponding to the diesel engine at 80% -90% load.
The cross section of the gap pressure-regulating groove 204 is semicircular. The groove depth of the gap pressure regulating groove 204 is 1mm to 1.5mm. The diameter of the through-flow section of the gap pressure regulating groove 204 is phi 1.5 mm-phi 2mm. The specific numerical value of the clearance pressure regulating groove 204 is subjected to fuel system fluid simulation calibration according to the cam profile, the plunger diameter and the like.
The plunger 2 comprises a plunger rod part 205 positioned below the plunger head part 201, and the plunger rod part 205 is provided with an annular oil groove 206.
The plunger 2 can run up and down in the plunger sleeve 1, when the oil distribution cam jacks the plunger 2 to move upwards to continuously pressurize to finish oil supply, then the plunger 2 continuously moves upwards to a certain position, the circumferential positions of the spiral inclined cutting groove 202 and the straight cutting groove 203 in the plunger sleeve 1 are adjusted by rotating the plunger 2, the spiral inclined cutting groove 202 is communicated with the oil inlet and return hole 101, fuel oil starts to flow through the oil inlet and return hole 101 from the straight cutting groove 203 and the spiral inclined cutting groove 202 and finally flows back to an oil return tank or a fuel oil pipeline, the oil quantity is controlled, and then the plunger continuously moves upwards until the stroke is finished.
The lash pressure groove 204 does not provide a pressure regulation function when the diesel engine is below 80% load. Namely, the gap pressure regulating groove 204 is not communicated with the oil inlet and return hole 101, the high-pressure fuel cavity 3 can obtain higher pressure, the system injection pressure is higher, the performance of low load in the diesel engine is improved, and the fuel consumption rate and the emission of CH and PM can be obviously improved.
When the load of the diesel engine is more than 80%, the plunger 2 continuously moves upwards to a certain position and then rotates the plunger 2, at the moment, the gap pressure regulating groove 204 is firstly communicated with the oil inlet and return hole 101 to partially release pressure, the pressure is prevented from exceeding the limit during oil supply, the plunger 2 continuously moves upwards to the spiral inclined cutting groove 202 to be communicated with the oil inlet and return hole 101, and pressure release is continuously performed.
When the clearance pressure regulating groove 204 is communicated with the oil inlet and return hole 101 for oil discharge, the through flow cross section area of a through flow passage formed by the inner wall of the plunger sleeve 1 and the clearance pressure regulating groove 204 on the plunger 2 is very small, so that the oil discharge pressure is very small, the pressure of a high-pressure cavity during oil supply can be regulated and controlled, the pressure is prevented from exceeding the limit, normal oil injection of an oil injection pump can be ensured, a small part of pressure relief is carried out from the communication of the clearance pressure regulating groove and the oil inlet and return hole 101 to the communication of the spiral inclined cutting groove 202 and the oil inlet and return hole, and subsequent pressure relief is carried out from the communication of the straight cutting groove 203 and the oil inlet and return hole 101, the pressure is a gradually-reducing process, the pressure of the high-pressure cavity above 80% of load is prevented from exceeding the limit, and the reliability of a fuel system is further ensured.
The utility model discloses a plunger matching parts of injection pump because the pressure regulating effect of pressure regulating groove's in advance in the clearance on the plunger for when the diesel engine heavy load, make high-pressure fuel oil chamber pressure can not transfinite, and fuel oil system's reliability can guarantee, and when the diesel engine low load pressure regulating groove inoperative, can obtain higher injection pressure, has improved the diesel engine burning and has discharged. A clearance pressure regulating ring groove is arranged at the position of the plunger piston corresponding to the effective oil supply stroke about 80% of load, and proper pressure relief is carried out to prevent the pressure of the pump end from exceeding the limit under the load of more than 80%.
The utility model discloses not confine above-mentioned embodiment to, all be based on the utility model discloses a conceive, principle, structure and method, all kinds of improvements made are all within the scope of protection of the utility model.
Claims (6)
1. Plunger matching parts of injection pump, including plunger bushing and plunger, the oil inlet and return hole has been seted up on the plunger bushing, the plunger is equipped with the plunger head, seted up spiral oblique grooving, its characterized in that on the periphery of plunger head:
the plunger piston comprises a plunger piston head, a spiral oblique cutting groove, a gap pressure regulating groove and a plunger piston top surface, wherein the circumferential surface of the plunger piston head is provided with the gap pressure regulating groove, the gap pressure regulating groove extends along the circumferential direction of the plunger piston head and is communicated with the spiral oblique cutting groove, the gap pressure regulating groove is arranged in parallel with the plunger piston top surface, and the gap pressure regulating groove is positioned at a corresponding effective oil supply stroke plunger piston when a diesel engine is under 80% -90% load.
2. The plunger and barrel assembly of an oil injection pump according to claim 1, wherein said gap pressure regulating groove has a groove depth of 1mm to 1.5mm.
3. An injection pump plunger and barrel assembly as in claim 2 wherein said gap pressure regulating groove is semi-circular in cross-section.
4. A plunger and barrel assembly for an oil injection pump according to claim 3, wherein said gap pressure regulating groove has a diameter of 1.5mm to 2mm.
5. A plunger and barrel assembly for an oil injection pump as described in claim 2, wherein said plunger includes a plunger rod portion below said plunger head portion, said plunger rod portion defining an annular oil groove.
6. An injection pump, comprising a plunger and barrel assembly of an injection pump according to any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221746948.8U CN218151210U (en) | 2022-07-07 | 2022-07-07 | Plunger and barrel assembly of fuel injection pump and fuel injection pump thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221746948.8U CN218151210U (en) | 2022-07-07 | 2022-07-07 | Plunger and barrel assembly of fuel injection pump and fuel injection pump thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218151210U true CN218151210U (en) | 2022-12-27 |
Family
ID=84591897
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221746948.8U Active CN218151210U (en) | 2022-07-07 | 2022-07-07 | Plunger and barrel assembly of fuel injection pump and fuel injection pump thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218151210U (en) |
-
2022
- 2022-07-07 CN CN202221746948.8U patent/CN218151210U/en active Active
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