CN111120171A - Fuel injection valve assembly - Google Patents
Fuel injection valve assembly Download PDFInfo
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- CN111120171A CN111120171A CN201911238194.8A CN201911238194A CN111120171A CN 111120171 A CN111120171 A CN 111120171A CN 201911238194 A CN201911238194 A CN 201911238194A CN 111120171 A CN111120171 A CN 111120171A
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- Prior art keywords
- needle valve
- section
- valve
- oil
- valve body
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0012—Valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0012—Valves
- F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
- F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
Abstract
The present invention is a fuel injection valve assembly. The assembly comprises an electromagnet, an armature, a sealing ball, a pressure regulating spring, an oil sprayer body, an oil nozzle tightening cap, a needle valve body, a binding post, an electromagnet spring, a control valve seat, a valve sleeve, an opening gasket and a long needle valve. The invention adopts a structure without static fuel leakage, thereby effectively reducing the power loss of the high-pressure oil pump; the structural design of the integrated long needle valve is adopted, so that the response speed of the oil sprayer is improved; the valve sleeve is of an integrated forming structure, the oil inlet throttling holes are symmetrically arranged, the fit clearance range of the long needle valve, the valve sleeve and the needle valve body is controlled, and the clamping risk in the movement process of the long needle valve is effectively reduced; the end face of the needle valve body is provided with the sealing ring belt, so that the sealing performance under high pressure is improved; meanwhile, the throttling range of the throttling section of the needle valve is definitely specified, so that a reasonable pressure drop range is generated up and down in the throttling section, fuel can be sprayed in a stable and controllable range, and the emission of an engine is effectively reduced.
Description
Technical Field
The invention belongs to the technical field of engines, and particularly relates to a fuel injection valve assembly.
Background
The existing mainstream fuel injection valve adopts a design structure that a control piston and a nozzle needle valve are separated, a fuel injector with the structure has a low-pressure cavity, high-pressure oil leaks into the low-pressure cavity through a matching part gap during working to cause the loss of high-pressure oil energy, so that the effective power of an oil pump and an engine is wasted, and the split structure causes the increase of moving parts to delay the response speed of the needle valve;
the valve sleeve in the prior art generally adopts a single oil inlet metering hole design, and the valve sleeve is unbalanced in stress due to asymmetrical structure in assembly and work, so that the phenomena of partial friction and clamping stagnation of a moving part are easily caused;
in the existing scheme, a valve sleeve is designed into a split structure, the structure has many parts and is complex to assemble, a plurality of sealing surfaces are generated, and the risk of fuel leakage exists;
the long needle valve with the existing structure mostly adopts first-level excircles with different diameters, has multiple processing procedures and large processing difficulty, and is not easy to ensure the coaxiality requirement among the excircles;
in the prior art, an additional oil duct and an oil containing groove are arranged in a needle valve body, so that the processing difficulty is high, and in order to enable the oil duct to be centered, a positioning mechanism needs to be additionally arranged;
in the existing long needle valve structure fuel injection valve, a throttle valve mechanism is arranged, the size of throttling pressure drop generated by a throttle valve is crucial to the injection stability of fuel oil, but in the prior art, only the stability problem of throttling is concerned, the size range of pressure drop caused by throttling is not clearly provided, when the pressure drop is too low, particularly under the working condition of high rail pressure, the instability of fuel oil injection is easily caused, so that an engine cannot meet the requirements of regulations, and the scheme in the prior art has high requirements on processing precision and high processing cost in actual processing.
Disclosure of Invention
The invention provides a fuel injection valve assembly which is simple in structure, adopts a structure without static fuel leakage, adopts an integrated long needle valve structure and adopts a valve sleeve integrated forming structure, and overcomes the defects of the existing injection valve.
The technical scheme of the invention is described as follows by combining the attached drawings:
a fuel injection valve assembly comprises an electromagnet assembly, a control valve assembly, a long needle valve assembly, an oil injector body 7 and an oil nozzle tightening cap 8, and is characterized in that the long needle valve assembly consists of a long needle valve 20, a valve sleeve 17, a needle valve body 9, an opening gasket 18 and a pressure regulating spring 5, one end of the valve sleeve 17, which is back to the control valve assembly, extends into a high-pressure cavity 6 in the oil injector body 7, and the center of the valve sleeve 17 is provided with a valve sleeve middle hole 33; the center of the needle valve body 9 is sequentially provided with a needle valve body counter bore 26 and a needle valve body middle bore 27; one end of the long needle valve 20 is longitudinally movably arranged in the valve sleeve central hole 33, the other end of the long needle valve 20 is longitudinally movably arranged in the needle valve body central hole 27, and the oil nozzle tightening cap 8 tightly presses the needle valve body 9 on the small end face of the oil injector body 7.
The long needle valve 20 is composed of a sealing cylindrical surface 34, an opening gasket connecting section 31, an opening gasket supporting section 35, a needle valve detecting section 28, a guiding section 21, a throttling section 22 and a sealing section in sequence, and the guiding section 21 is located at the upstream or the downstream of the throttling section 22.
The sealing cylindrical section 34 of the long needle valve 20 is in clearance fit with the valve sleeve 17, and the fit clearance is 0.003-0.012 mm; the guide section 21 and the throttle section 22 of the long needle valve 20 are in clearance fit with the needle valve body 9, and the fit clearance is 0.002-0.015 mm; the outer surface of the long needle valve 20 except the part matched with the valve sleeve 17 and the needle valve body 9 is immersed in high-pressure oil in the high-pressure chamber 6 together with the pressure regulating spring 5 and the opening gasket 18.
The diameter D1 of the sealing cylindrical surface 34, the diameter D2 of the opening gasket supporting section 35, the diameter D3 of the needle valve detecting section 28, and the diameters of the outer circles of the guide section 21 and the throttling section 22 are all equal.
At least one throttling section flat position 25 is arranged on the circumference of the throttling section 22, and the plurality of throttling section flat positions 25 are uniformly arranged on the circumference of the throttling section 22; the surface of the throttling section flat position 25 is a plane, a concave surface or a convex surface; a flow section is formed between the flat position 25 of the throttling section and the inner wall of the middle hole 27 of the needle valve body, and fuel oil flows down to the sealing conical surface 23 of the needle valve body through the flow section; the ratio of the flow cross-sectional area S1 of the throttling section 22 to the sum of the areas of all the spray holes 11 is 1-7; the length L of the throttling section 22 is 0.5-5 mm.
The open gasket 18 is sleeved on the open gasket step 30 on the long needle valve 20; the pressure regulating spring 5 is sleeved on the long needle valve 20, one end of the pressure regulating spring is contacted with the lower end surface of the valve sleeve 17, and the other end of the pressure regulating spring presses the opening gasket 18 on the opening gasket supporting surface 29 on the long needle valve 20.
The opening size H of the opening gasket 18 is larger than the outer diameter D5 of the opening gasket connecting section 31 and smaller than the outer diameter D4 of the opening gasket step 30; the inner diameter D of the split washer 18 is greater than the outer diameter D4 of the split washer step 30 and less than the outer diameter D2 of the split washer support segment 35; the outer diameter D of the opening gasket 18 is larger than the outer diameter of the pressure regulating spring 5.
An oil outlet metering orifice 15 is arranged in the center of the valve sleeve 17, and the oil outlet metering orifice 15 is communicated with a valve sleeve middle hole 33; the side surface of the valve sleeve 17 is radially provided with a first oil inlet hole and a second oil inlet hole 4 and 4b which are symmetrical, and the first oil inlet hole and the second oil inlet hole 4 and 4b are communicated with the valve sleeve middle hole 33 and the high-pressure cavity 6; the control chamber 16 is formed by the inner surface of the bore 33 in the valve housing and the end surface of the sealing cylinder 34.
The big end part of the needle valve body 9 is provided with a raised sealing ring belt 32, and the sealing ring belt 32 is in compression fit with the small end surface of the oil injector body 7; the head of the needle valve body 9 is provided with a plurality of spray holes 11 at the section of the sealing conical surface 23 of the needle valve body; the nozzle end of the long needle valve 20 is provided with a needle valve sealing conical surface 10, and the needle valve sealing conical surface 10 is matched with a sealing conical surface 23 inside the needle valve body 9.
A plurality of guide section flat positions 24 are also arranged on the circumferential direction of the guide section 21; the surface of the flat position 24 of the guide section is a plane, a concave surface or a convex surface; a flow section S2 is formed between the flat position 24 of the guide section and the inner wall of the central hole 27 of the needle valve body, and the ratio of the flow section S2 to the sum of the areas of all spray holes 11 is more than 8.
The invention has the beneficial effects that:
1. the invention adopts the long needle valve structure without static leakage, avoids the energy loss caused by high-pressure fuel leakage in the prior scheme, and saves the power of an oil pump and an engine;
2. the invention adopts an integrated long needle valve structure, reduces the number of moving parts and improves the response speed of the needle valve movement;
3. the sizes of the primary excircles of the long needle valve are equal, all excircles can be machined in one working procedure, the production efficiency is improved, and the coaxiality of the excircles can be ensured;
4. the valve sleeve adopts an integrated valve sleeve structure and is provided with the symmetrically arranged oil inlet throttling holes, and meanwhile, the fit clearance range of the long needle valve, the valve sleeve and the needle valve body is controlled, so that the clamping risk in the movement process of the long needle valve is effectively reduced;
5. the needle valve body is simple in structure, an oil channel and an oil containing groove do not need to be additionally processed, and the end face of the needle valve body is provided with the raised sealing ring belt, so that the sealing performance under high pressure is improved;
6. according to the invention, through the arrangement of the throttling section, the pressure difference of the stress at the upper end and the lower end of the long needle valve is manufactured, and the problem of difficult closing of the long needle valve oil sprayer is solved;
7. the flow area of the throttling section is quantitatively designed, so that the pressure difference of fuels at the upstream and the downstream of the flat position of the throttling section can be maintained in a reasonable range, the long needle valve can be more smooth and stable in the movement process, the injection precision and stability of the oil injector are ensured, and the emission of an engine is favorably reduced;
8. the invention has simple, compact and reasonable structure, is easier to control in processing and manufacturing than the prior art, and realizes a simple and efficient production mode.
Drawings
FIG. 1 is a cross-sectional view of the structure of the present invention;
FIG. 2 is a schematic view showing a structure of a long needle valve according to the present invention;
FIG. 3 is a schematic view of the structure of an opening gasket according to the present invention;
FIG. 4 is an enlarged schematic view of a fuel injector nozzle assembly portion of the present invention;
FIG. 5a is a cross-sectional view of a first cross-sectional shape of a flow restriction segment of the present invention;
FIG. 5b is a cross-sectional view of a second cross-sectional shape of the flow restriction section of the present invention;
FIG. 5c is a cross-sectional view of a third cross-sectional shape of a flow restriction section of the present invention;
FIG. 5d is a cross-sectional view of a fourth cross-sectional shape of the flow restriction section of the present invention;
FIG. 6 is a cross-sectional view of the needle valve body of the present invention;
fig. 7 is a structural cross-sectional view of the valve sleeve of the present invention;
in the figure: 1. an electromagnet; 2. an armature; 3. sealing the small ball; 4. a first oil inlet hole; 4b, a second oil inlet hole; 5. a pressure regulating spring; 6. a high pressure chamber; 7. an injector body; 8. tightening a cap of the oil nozzle; 9. a needle valve body; 10. the needle valve seals the conical surface; 11. spraying a hole; 12. a binding post; 13. an electromagnet spring; 14. a control valve seat; 15. an oil outlet metering hole; 16. a control chamber; 17. a valve housing; 18. an open gasket; 19. an oil inlet hole; 20. a long needle valve; 21. a guide section; 22. a throttling section; 23. the needle valve body seals the conical surface; 24. the guide section is flat; 25. the throttling section is flat; 26. a needle valve body counter bore; 27. a needle valve body central hole; 28. a needle valve detection end; 29. an open gasket support surface; 30. an open gasket step; 31. an open gasket connection section; 32. the needle valve body seals the ring belt; 33. a valve housing central bore; 34. sealing the cylindrical surface; 35. an open gasket supports the segment.
Detailed Description
Referring to fig. 1, the assembly comprises an electromagnet assembly, a control valve assembly, a long needle valve assembly, an oil injector body 7 and an oil nozzle tightening cap 8; the long needle valve component consists of a long needle valve 20, a valve sleeve 17, a needle valve body 9, an opening gasket 18 and a pressure regulating spring 5.
The electromagnet assembly includes: the electromagnet 1, a binding post 12 and an electromagnet spring 13; the control valve assembly includes: armature 2, sealing ball 3, control valve seat 14.
The long needle valve 20 sequentially comprises a sealing cylindrical surface 34, an opening gasket connecting section 31, an opening gasket supporting section 35, a needle valve detecting section 28, a guide section 21, a throttling section 22, a nozzle end and the like, a needle valve body counter bore 26 and a needle valve body middle bore 27 are sequentially formed in the center of the needle valve body 9, a valve sleeve middle bore 33 is formed in one end, opposite to the armature 2, of the valve sleeve 17, the sealing cylindrical surface end 34 of the long needle valve 20 is longitudinally movably arranged in the valve sleeve middle bore 33, and the inner surface of the valve sleeve middle bore 33 and the end surface of the sealing cylindrical surface 34 of the long needle valve 20 are surrounded to form a control cavity 16; the nozzle end of the long needle valve 20 is arranged in the needle valve body central hole 27 in a longitudinally movable mode, and the nozzle tightening cap 8 presses the needle valve body 9 on the small end face of the oil injector body 7.
Referring to fig. 2, the outer diameters of the sealing guide cylindrical surfaces of the long needle valve 20 are equal, which includes: the diameter D1 of the sealing cylindrical surface 34, the diameter D2 of the open gasket support section 35, the diameter D3 of the needle valve detection section 28, and the outer diameters including the outer diameters of the guide section 21 and the throttle section 22 are all equal. The design aims to realize one-step molding in the process of machining the outer circle of the long needle valve 20, thereby reducing the machining procedures, improving the coaxiality of the whole long needle valve 20 and improving the machining quality.
The open gasket 18 is sleeved on the open gasket step 30 on the long needle valve 20, the pressure regulating spring 5 is sleeved on the long needle valve 20, one end of the pressure regulating spring is in contact with the lower end face of the valve sleeve 17, and the other end of the pressure regulating spring presses the open gasket 18 on the open gasket supporting face 29 on the long needle valve 20.
Referring to fig. 3, the opening size H of the split washer 18 should be larger than the outer diameter D5 of the split washer connecting section 31 and smaller than the outer diameter D4 of the split washer step 30, the inner diameter D of the split washer 18 should be larger than the outer diameter D4 of the split washer step and smaller than the outer diameter D2 of the split washer supporting section 35, and the outer diameter D of the split washer 18 should be larger than the outer diameter of the pressure regulating spring 5. The purpose of the provision of the split washer and the above-described design of the split washer is to provide structural support for the pressure regulating spring 5 in the case where the outer diameters of the respective seal guide cylindrical surfaces of the long needle valve 20 are all equal, and at the same time, the split washer 18 of the present invention is easy to install and is sufficiently strong so as not to fall off.
Referring to fig. 6, the large end of the needle valve body 9 is provided with a raised sealing ring belt 32, the sealing ring belt 32 is in press fit with the small end face of the injector body 7, the axial force of the end face can be improved, and the risk of high pressure oil leakage under high rail pressure can be reduced, the head of the needle valve body 9 at the section of the needle valve body sealing conical surface 23 is provided with a plurality of spray holes 11, and fuel can be sprayed into a combustion chamber through the spray holes. The nozzle end of the long needle valve 20 is provided with a needle valve sealing conical surface 10 which is matched with a needle valve body sealing conical surface 23 inside the needle valve body 9, and the opening and closing of the sealing surface are used for controlling the on-off of fuel oil.
Referring to fig. 7, an oil outlet metering hole 15 is formed in the center of the valve sleeve 17, the oil outlet metering hole 15 is communicated with the valve sleeve middle hole 33, a plurality of symmetrical oil inlet metering holes 4 are radially formed in the side surface of the valve sleeve 17, the oil inlet metering holes 4 are communicated with the valve sleeve middle hole 33 and the high-pressure cavity 6, and two symmetrical oil inlet metering holes 4 and 4b are preferably formed. Compared with the traditional single-oil-inlet-flow-hole valve sleeve, the valve sleeve with the symmetrical multi-hole structure can effectively avoid the eccentric friction or clamping stagnation caused by deformation of the long needle valve 20 and the valve sleeve 17 in the assembling and working processes.
The long needle valve 20 is in clearance fit between the sealing cylindrical section 34 and the valve sleeve 17, the fit clearance is 0.003-0.012mm, the guide section 21 and the throttle section 22 of the long needle valve 20 are also in clearance fit with the needle valve body 9, and the fit clearance is 0.002-0.015 mm. The clearance between the two pairs of matching parts matched with the long needle valve 20 is controlled to avoid the clamping stagnation of the matching parts in the installation and working processes.
Referring to fig. 4, the head of the long needle valve 20 is provided with a guide section 21 and a throttle section 22 which are matched with a central hole 27 of the needle valve body.
Referring to fig. 5a to 5d, at least one throttle segment flat position 25 is arranged at the circumference of the throttle segment 22, and a plurality of throttle segment flat positions 25 are uniformly arranged at the circumference of the throttle segment 22. According to the practical experience of engineering, the throttle section 22 is preferably provided with 3 or 4 throttle section flat positions 25, as shown in fig. 5 (a-5 (d), the throttle section flat positions 25 can adopt a flat surface, a concave surface or a convex surface design as required.
The flow cross section is formed between the flat throttle section 25 and the inner wall of the needle valve body central hole 27, through which the fuel can flow down to the needle valve body sealing conical surface 23, and the area of the flow cross section is set to S1 (as shown in fig. 5a to 5d, it has a significant throttling effect on the flow of the fuel, during the fuel flowing through the flat throttle section 25, a significant pressure drop is generated between the area a upstream and the area B downstream of the throttle section 22, and this pressure drop has an important effect on the long needle valve type fuel injector:
on the one hand, the existence of the pressure drop can ensure that a smaller hydraulic pressure is obtained between the needle valve body sealing conical surface 23 and the needle valve sealing conical surface 10, so that when the fuel injector is closed, the downward acting force applied to the top of the long needle valve 20 positioned in the control cavity 16 is larger than the upward acting force applied to the nozzle part of the long needle valve 20, and the normal closing of the fuel injector is ensured.
On the other hand, if the pressure drop between the area A and the area B is small, the needle valve can encounter large resistance in the closing and descending process, and the needle valve is likely to shake in the moving process, so that the oil quantity injection is unstable. However, when the pressure difference exceeds a certain range, the movement of the needle valve is smoother in theory, but the larger pressure difference also means that the throttling loss is large, namely the pressure loss of the fuel at the nozzle end is large, so that the atomizing effect of the fuel is adversely affected, and the larger energy loss is also caused.
In order to generate the above reasonable pressure difference in the throttling section 22, the ratio of the flow cross-sectional area S1 of the throttling section 22 to the sum of the areas of all the spray holes 11 should be in the range of 1-7.
In addition, in order to ensure that the pressure loss of the upstream and downstream of the throttle section 22 does not change along with the change of the external temperature during the operation of the fuel injector, the length L of the throttle section 22 should be within the range of 0.5-5 mm.
The guide section 21 may be arranged upstream or downstream of the throttle section 22, the main function of which, as the name implies, is to help ensure that the needle valve 20 is reliably guided in the needle valve body 8.
Similar to the throttle section 22, the guide section 21 is also provided with several guide section flat portions 24 in the circumferential direction, preferably 3 guide section flat portions 24, and the guide section flat portions 24 may be flat, concave or convex surfaces.
The flat position 24 of the guide section is arranged in the opposite way to the flat position 25 of the throttling section, the former mainly takes circulation, and the latter mainly takes throttling.
The flat position 24 of the guide section and the inner wall of the central hole 27 of the needle valve body form a certain flow cross section, the area of the flow cross section is set to be S2, S2 can not generate obvious throttling to the fuel flowing through, and therefore stable and sufficient supply of the fuel can be guaranteed. To avoid causing unnecessary throttling, it is provided here, with reference to the setting of the throttle flat 25, that the ratio of S2 to the sum of the areas of all the injection openings 11 should be greater than 8.
The fuel injection valve of the long needle valve structure is of a non-static leakage type structure, a high-pressure cavity 6 is arranged in the middle of an oil injector body 7, and the rest part of the outer surface of a long needle valve 20, except the part matched with a valve sleeve 17 and a needle valve body 9, together with a pressure regulating spring 5 and an opening gasket 18, is immersed in high-pressure oil in the high-pressure cavity 6.
The fuel oil can enter the high-pressure cavity 6 through the oil inlet 19, one path of the fuel oil flows downwards from the high-pressure cavity 6 through the needle valve body counter bore 26, the guide section flat position 24 and the throttle section flat position 25 to the needle valve body sealing conical surface 23, the other path of the fuel oil flows upwards from the high-pressure cavity 6 and enters the control cavity 16 through the first oil metering hole 4 and the second oil metering hole 4b, the main coupling part and the moving part in the fuel injection valve are all under the high-pressure oil, and no communicated low-pressure cavity exists.
The invention provides a long needle valve fuel injection valve without static leakage, which not only solves the defect of static leakage of the traditional injection valve, but also enables the processing and the assembly of the parts to be simpler and more convenient by specially designing key parts such as a long needle valve 20, a valve sleeve 17, a needle valve body 9 and the like, and is beneficial to improving the injection precision, the response speed and the stability of the fuel injection valve, and enables an engine to be more environment-friendly and efficient.
Claims (10)
1. A fuel injection valve assembly comprises an electromagnet assembly, a control valve assembly, a long needle valve assembly, an oil injector body (7) and an oil nozzle tightening cap (8), and is characterized in that the long needle valve assembly consists of a long needle valve (20), a valve sleeve (17), a needle valve body (9), an opening gasket (18) and a pressure regulating spring (5), one end, back to the control valve assembly, of the valve sleeve (17) extends into a high-pressure cavity (6) inside the oil injector body (7), and a valve sleeve middle hole (33) is formed in the center of the valve sleeve (17); a needle valve body counter bore (26) and a needle valve body middle bore (27) are sequentially formed in the center of the needle valve body (9); one end of the long needle valve (20) can be longitudinally movably arranged in the valve sleeve middle hole (33), the other end of the long needle valve (20) can be longitudinally movably arranged in the needle valve body middle hole (27), and the oil nozzle tightening cap (8) tightly presses the needle valve body (9) on the small end face of the oil injector body (7).
2. A fuel injection valve assembly according to claim 1, wherein the long needle valve (20) is composed of a sealing cylindrical surface (34), an opening gasket connecting section (31), an opening gasket supporting section (35), a needle valve detecting section (28), a guide section (21), a throttle section (22), and a sealing section in this order, and the guide section (21) is located upstream or downstream of the throttle section (22).
3. The fuel injection valve assembly as set forth in claim 1, wherein the sealing cylindrical section (34) of the long needle valve (20) is in clearance fit with the valve sleeve (17), and the fit clearance is 0.003-0.012 mm; the guide section (21) and the throttle section (22) of the long needle valve (20) are in clearance fit with the needle valve body (9), and the fit clearance is 0.002-0.015 mm; except the part of the outer surface of the long needle valve (20) matched with the valve sleeve (17) and the needle valve body (9), the rest part, the pressure regulating spring (5) and the opening gasket (18) are immersed in high-pressure oil in the high-pressure cavity (6).
4. A fuel injection valve assembly according to claim 2, wherein the diameter D1 of the sealing cylindrical surface (34), the diameter D2 of the split washer support section (35), the diameter D3 of the needle valve detection section (28), and the diameters of the outer circumferences of the guide section (21) and the throttle section (22) are all equal.
5. A fuel injection valve assembly according to claim 2, characterized in that the throttle section (22) is provided at its circumference with not less than one throttle section flat (25), a plurality of throttle section flat (25) being arranged uniformly around the throttle section (22); the surface of the throttle section flat position (25) is a plane, a concave surface or a convex surface; a flow section is formed between the flat position (25) of the throttling section and the inner wall of the middle hole (27) of the needle valve body, and fuel oil flows down to the sealing conical surface (23) of the needle valve body through the flow section; the ratio of the flow cross-sectional area S1 of the throttling section (22) to the sum of the areas of all the spray holes (11) is 1-7; the length L of the throttling section (22) is 0.5-5 mm.
6. A fuel injection valve assembly according to claim 1, characterized in that said split washer (18) is fitted over a split washer step (30) on the long needle valve (20); the pressure regulating spring (5) is sleeved on the long needle valve (20), one end of the pressure regulating spring is in contact with the lower end face of the valve sleeve (17), and the other end of the pressure regulating spring compresses the opening gasket (18) on the opening gasket supporting face (29) on the long needle valve (20).
7. A fuel injection valve assembly according to claim 1, characterized in that the opening size H of the opening gasket (18) is larger than the outer diameter D5 of the opening gasket connection section (31) and smaller than the outer diameter D4 of the opening gasket step (30); the inner diameter D of the split washer (18) is greater than the outer diameter D4 of the split washer step (30) and less than the outer diameter D2 of the split washer support section (35); the outer diameter D of the opening gasket (18) is larger than that of the pressure regulating spring (5).
8. A fuel injection valve assembly according to claim 1, wherein said valve housing (17) is centrally provided with an oil outlet (15), said oil outlet (15) communicating with said valve housing central bore (33); the side surface of the valve sleeve (17) is radially provided with a first oil inlet hole and a second oil inlet hole (4, 4b) which are symmetrical, and the first oil inlet hole and the second oil inlet hole (4, 4b) are communicated with the valve sleeve middle hole (33) and the high-pressure cavity (6); the inner surface of the valve sleeve central hole (33) and the end surface of the sealing cylindrical surface (34) surround to form a control cavity (16).
9. A fuel injection valve assembly according to claim 1, characterized in that the large end of the needle valve body (9) is provided with a raised sealing ring (32), the sealing ring (32) being in press fit with the small end face of the injector body (7); the head of the needle valve body (9) is provided with a plurality of spray holes (11) at the section of the sealing conical surface (23) of the needle valve body; the nozzle end of the long needle valve (20) is provided with a needle valve sealing conical surface (10), and the needle valve sealing conical surface (10) is matched with a sealing conical surface (23) in the needle valve body (9).
10. A fuel injection valve assembly according to claim 1, characterized in that the guide section (21) is also provided with guide section flats (24) in the circumferential direction; the surface of the flat position (24) of the guide section is a plane, a concave surface or a convex surface; a flow section S2 is formed between the flat position (24) of the guide section and the inner wall of the needle valve body middle hole (27), and the ratio of the flow section S2 to the sum of the areas of all spray holes (11) is more than 8.
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| CN201911238194.8A CN111120171B (en) | 2019-12-06 | 2019-12-06 | Fuel injection valve assembly |
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| CN201911238194.8A CN111120171B (en) | 2019-12-06 | 2019-12-06 | Fuel injection valve assembly |
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| CN111120171B CN111120171B (en) | 2021-08-10 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112377345A (en) * | 2020-11-30 | 2021-02-19 | 一汽解放汽车有限公司 | Injection valve |
| CN112502879A (en) * | 2020-11-10 | 2021-03-16 | 一汽解放汽车有限公司 | Fuel injection valve |
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| CN110529316A (en) * | 2019-08-22 | 2019-12-03 | 一汽解放汽车有限公司 | A kind of fuel injection valve and engine |
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| CN112502879A (en) * | 2020-11-10 | 2021-03-16 | 一汽解放汽车有限公司 | Fuel injection valve |
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| CN112377345B (en) * | 2020-11-30 | 2022-02-11 | 一汽解放汽车有限公司 | Injection valve |
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| CN111120171B (en) | 2021-08-10 |
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