JPS59502032A - fuel injection valve - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a fuel injection valve for a diesel engine.

Traditional diesel injectors work with frustoconical valve seats to control fuel flow It incorporates a needle valve formed by the conical top of the needle member. Burning The fuel is fed into an annular chamber surrounding the needle member adjacent to its top, so that the fuel The pressure impulse during delivery moves the needle member axially and the plow away from the valve seat.Then the fuel flows from the annular chamber to the central orifice of the valve seat. flows through the

In a single spray injector, the spray orifice is connected to the needle member and and axially aligned with the valve seat, but in many spray injectors A number of spray orifices 7 are formed in the nozzle along with the outlet side of the valve seat.

There are many cases where it is desired to disperse the injected fuel in a combustion system. A spray injector is preferred.

Disclosure of invention It is an object of the present invention to provide an improved fuel injection valve, in particular for: spraying fuel in the form of a spiral cone; The aim is to provide a valve that allows

A fuel injection valve according to the present invention has a fuel delivery nozzle body formed with a central bore. , a fuel spray orifice coaxial with the bore; a fuel spray orifice coaxial with the orifice; A-head circular thrust valve seat that tapers inward toward the orifice, and the fuel record and the fuel supply passage supplying the orifice, and further inside the bore. a valve seat slidably received in and cooperating with the valve seat to open and close the orifice; a needle member having a reduced diameter cylindrical end portion terminating in a conical apex; In the fuel fEJr injection valve for Diesel/I/engine, the nozzle body is formed with a material supply passageway and a slowing chamber in which the needle is placed. The shoulder portion of the needle member protrudes and the increase in fuel pressure causes the needle member to move forward from the valve seat. It is designed to be moved to the visceral gyrus to disengage the conical apex, and also to disengage the conical top. The nozzle body has a wide part of the valve seat: a cylindrical part of the central bore adjacent to the wide part of the valve seat; It is formed with a large number of fuel supply passages extending in the linear direction and opening into the cylindrical part. and forward movement when the needle member moves axially out of engagement with the valve seat. The cylindrical end portion of the needle member is adapted to blunt the passageway. It is a sign.

The cylindrical end portion of the needle member has a fuel supply passageway that enters into the cylindrical portion a of the central bore. A spool valve is formed with the needle member in the axial direction of the needle member. When moving, these forces are applied, unrelated to the opening of the valve seat, but somewhat related. control the opening of the passageway. The opening of the spool valve occurs gradually, thereby Controls the flow of water to the valve seat.

The number of openings in the fuel supply passage with respect to the valve seat is the same as the number of openings in one direction. It can be modified to cause a delay in action.

Hereinafter, embodiments of the invention will be described with reference to the drawings.

FIG. 1 is an analytical plan view of an injection valve according to a first embodiment of the present invention. FIG. 2 is a sectional view taken along plane 2-2 of FIG. 1, FIG. 3 is a sectional view taken along plane 3-3 of FIG. 1; Figure 4 shows the end of the injector nozzle in Figure 1 with the needle member lifted from the seat. This is an enlarged view of FIG. 5 is a partial rim sectional view of an injection valve according to a second embodiment of the present invention; FIG. 6 is a diagram of the axis of the injection valve according to the third embodiment of the invention, FIG. 7 is a sectional view taken along plane 7-7 of FIG. 6, and Figure 8 shows a diesel engine equipped with an injector incorporating an injection valve according to the present invention. FIG.

FIG. 8 shows the bottom surface of the head 2, the cylinder 3 in the block 4, and the crown of the piston 5. of a diesel engine to inject a spray of fuel into the combustion chamber defined by the The combustion injector 1 is shown installed in the head. Bracket 6 mounting bolt The injector 7 pushes the injector down into the bore 8 in the head, and the fuel pipe 9 injects the fuel. Add to the top of the kuta.

The injector has a body 10 with a fuel pipe 9 on the body 10. The body 10 passed through an internal passage 11 (see number 14). Nothing The material is supplied to a nozzle assembly 12 connected to the lower end of the body by a cap nut 13. It is adapted for use.

The injector body 10 and the means for viewing it within the head are of known design. However, the nozzle assembly 12 may be constructed according to the present invention as shown in FIGS. and is adapted to the barrel to give the injected fuel spray a conical shape.

The nozzle assembly skin includes a nozzle body 14 and a central cylindrical bore 16 of the body 14. It consists of a needle member 15 that can slide smoothly.

The lower part 17 of the needle member is reduced in diameter and terminates in a conical nose 18.

The lower portion 17 extends through two corresponding bores 19 in the lower end of the body 14 and The nose 18 of the dollar member is a truncated circle at the lower end of the bore 19 surrounding the fuel injection hole 21. Collaborate with Dozami. Pressure and compression are fitted at the upper end of the needle member 15. It is mounted on the mouthparts and acts between the injector pod 10 and the needle part 15. Pushing the needle member 15 downward to engage the nose 18 with the seat J; This closes the fuel injection hole 21 and forms a liquid-tight and air-tight seal.

The upper surface of the nozzle body 14 has an annular fuel passage communicating with the fuel passage 11 in the injector body. Four equiangularly spaced fuel passages δ are formed with the fuel gear assembly. Extending downward from the top to the bottom end of the nozzle body. The openings 26 are located in these passages 5. 1 and the lower part 416' of the central bore 16, so that the fuel pressure increase realized within the lower end of the bore 16 and acting on the shoulder portion 151 of the needle member to The board N member is lifted up against the bias of the spring n.

The lower end of each passageway 5 is an inwardly extending passageway opening into a bore 19 adjacent to the top of the seat. Il communicates with n. These four A-ro swords, as shown in Figure 3, are Direct the fuel in the normal sense of rotating around the circumference of the moat. The sea urchin bore 192 and the zami no kiri 1 are oriented toward the urine. directly next to nose 18 The lower diameter reduced portion 17 of the abutting needle member constitutes a land path, and the land path is During the movement of the handle member 15, the cutting passages are used to varying degrees.

During operation 2, high-pressure fuel is supplied from the injection pump to the injector. It will be done. below the central bore for receiving high pressure impulses through passages 11 and 5. The end 16' is pressurized and the needle member responds to the strength of the pressure impulse and its impact. is raised against the bias of the spring n to the extent due to the deviation of the loop. Needle member 1 The lifting of 5 results in the separation of the conical nose 18 and the seat, thereby opening the hole 2. Open 1. When lifting the needle member 15, also land the needle member 15 to open the contact passage n. and the fuel is sprayed between the nose and the seat to form a conical hollow spray shown as 4 in Figure 8. It flows in a rotating manner. Therefore, lift the needle member and make the hole. The dual action of pumping ■ and opening the fluid gland passage I to allow fuel flow. There is. The @ice direction position of the opening of the passage n with respect to the frustoconical seat 20 creates a spray. The delay between needle member lift and fuel flow will be determined in order to

The selection of the dimensions of the fuel passages, their number and arrangement are determined by the given distance between the nose 18 and the seat. to control the pressure and amount of fuel flowing between the nose and seat. cone such that it can be made and thereby make independence of these parameters Allows angle selection.

In a modified embodiment of the invention as shown in FIG. Instead of being located in a plane perpendicular to the axis, it can be turned inward and downward at an angle O It is also not possible to position it on the cone surface of the plant.

The nozzle body 14 shown in FIGS. 1-5 is formed as an integral body and has fuel passages. 5, additions and I are drilled therein, and their drilling holes for passages 26, d The outer portion 30 of is plugged. However, the alternative shown in Figures 6 and 7 In an alternative implementation, row 3, the nozzle body 14 is fitted within the outer sleeve portion 32. It has an inner cylindrical portion 31 that is received as a fit, and a strip on the outer surface of the inner portion 31. A bay is formed which is closed by the inner surface of the ribbed portion 32, thereby allowing the passage 5, A sword is formed.

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Claims (1)

[Claims] 1. a fuel delivery nozzle body formed with a central bore, a fuel coaxial with said bore; a spray orifice co-fabric with and inwardly toward said orifice; a frusto-conical valve seat tapered to a truncated conical valve seat; a fuel supply passageway for supplying fuel to the bore, and further slidably received within the bore. and terminating in a conical top that cooperates with the valve seat to open and close the orifice. Fuel for diesel Isoseki having a needle member having a reduced diameter cylindrical end portion In the injection valve, the nozzle body 11O communicates with the natural supply passage (25). The needle member is formed within the chamber (16 chambers). The shoulder part (15') of αQ protrudes and the fuel pressure rises to move the needle member forward. Move the shaft 1 in the direction to disengage the conical top (18) from the valve seat (2o). The nozzle body σ has a wide end of the valve seat (20). The cylindrical portion (19) of the central bore adjoins the central bore and It is formed with a large number of dual-material co-supply passages (27) opening into the cylindrical portion (19). , the needle member is moved in the axial direction so as to be disengaged from the valve seat (20). When the needle member is opened, the cylindrical end portion (17) of the needle member opens the passageway (27). A fuel injection valve characterized in that the fuel injection valve is configured to 2. In the valve according to claim 1, the needle member 11G has a reduced diameter. a main cylindrical body joined to the cylindrical end portions by the shoulder portions (15); The central bore (1G is a portion of the main body that is slidably received in the central bore). and a main circle through which a portion of the cylindrical end portion (17) of the needle member extends. a cylindrical portion, the main cylindrical portion of which is connected to the shoulder portion (15') of the needle member; and the cylindrical end of the needle member of the main cylindrical portion of the central bore αQ. (17) extends in the axial direction between the sliding joint with the cylindrical part (19). The valve is adapted to define the chambers (16) in a ring-like manner. 3. In the valve according to claim 1 or 2, the fuel supply in the tangential direction is provided. The feeding passage (27) is located in a common plane perpendicular to the glaze and bag of the needle member. There is a valve. 4. The valve according to claim 1 or 2, in which the fuel supply in the tangential direction The position of the passage (27) is radially inward around the orifice c21) and at the @ line. A valve that is oriented in a direction. 5. In the valve according to any one of claims 1 to 4, the center opening of said tangential fuel supply passageway (27) into said cylindrical portion (19) of the bore; are valves spaced equiangularly around the cylindrical portion. 6. In the valve according to any one of claims 1 to 5, the nozzle The body σΦ is formed in the form of an inner core (31) and a groove on the outer surface of the inner core (31). an outer sleeve (32) in which a tangential fuel supply passageway (27) is formed; valve. 7. Injector body 4 and any one of the items M1 to 6 of the claim A combustion angle injector for a diesel engine having a valve mounted therein.