JPS63134856A - Fuel injection nozzle - 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 includes an elongate body, a valve member guided for movement within the body, a resilient member biasing the valve member into contact with a valve seat, and wherein the valve member passes through an inlet. The present invention relates to a fuel injection nozzle of the type that is lifted from a valve seat to flow fuel through an outlet by pressurized fuel contained in the valve.

The fuel outlet communicates directly with a chamber in which the valve member is disposed, or communicates with and communicates with an axial passage formed within the body. In each of the above cases, the inlet generally extends at right angles to the axis of the body and it has been practical to form the inlet in a part that is attached to or formed integrally with the body. In the former case, the part must be attached to the body in a fuel-tight manner, and in the latter case the body is generally formed as a casting and then machined. In both cases, the body construction is expensive.

The object of the invention is to provide a fuel injection nozzle of the above type in a simple and convenient manner.

According to the present invention, in the nozzle of the above type, the main body has a cylindrical shape, the inlet has the shape of a recess in the outer surface of the main body, the nozzle includes a clamping member disposed on the main body layer, and the nozzle includes a clamping member disposed on the main body layer. The clamping member has a boss having a bore and a hollow clamping element engageable with said boss portion, said clamping element pressing against a shaped surface sealingly engaging said recess when tightened in use. and is used to move and pull the clamp member into tight engagement with the body.

In FIG. 1, the illustrated nozzle is known in the art as a "pencil deaf injector" and includes an elongated body 10 having a bore 11. As shown in FIG. At one end of the bore an annular valve seat 12 is formed which cooperates with the shaped end of the valve member 13 .

The valve member is slightly narrower than the bore 11 over its entire length, thus providing an annular cavity through which fuel can flow to the outlet orifice 15 when the valve member is lifted from its seat. The valve member through which flow from the inlet 14 is guided for axial movement within the bore by a bushing 16 which is mounted within the distal end of the body 10 and is slightly smaller than the bore 11. having a central bore having a diameter, this portion of the valve member passes through the bush;
This bushing also has a slightly smaller diameter than the rest of the valve member.

A stop plate 17 is arranged facing the bush 16 and has an opening formed therein, through which a further small diameter section 18 of the valve member passes, and on which a spring receiver 19 is mounted. The spring receiver 19 is engaged with one end of a helical compression spring, the opposite end of which abuts another spring receiver 21 .

The spring receivers and springs are disposed within a hollow cap member 22 which is threadedly engaged with a mating internally threaded retainer member 23 attached to the body 10. The cap member serves to hold the stop plate 17 in place and is mounted with an adjustable abutment member 24 so that the force exerted by the spring 20Vc can be adjusted from outside the nozzle. The cap member also comprises a passage 25 through which the rate collecting in the chamber occupied by the spring can escape. In operation, when pressurized fuel is supplied through the inlet 14, this pressure acts on the valve member and lifts it against the action of the spring 200, allowing fuel to flow from the outlet orifice 15. The amount of movement of the valve member is limited by its abutment with stop plate 17.

The inlet 14 in the example shown in FIG. The body 10 of the injector is drilled to provide an opening into the bore 11 and the body 29 is soldered to the vibrator to provide a fuel-tight seal. The opposite end of the short vibe 26 is provided with a conventional pipe connector, whereby this section is connected in use to a pipeline extending to the fuel injection pump. The initial processing of the body 29, together with the soldering operation, contributes significantly to the overall cost of the nozzle installation, and in addition, this soldering operation must be carried out carefully to ensure that a fuel-tight connection is obtained. .

FIG. 2 shows part of an alternative injection nozzle, in which the valve member is arranged in a separate body attached to the nozzle body 30, the nozzle body 30 having a chamber 31, with the valve member in the closed position. It houses a spring that is biased towards. In this case, the fuel is conveyed from the fuel inlet through a passage 32 formed in the body into an annular cavity formed between the valve member and the wall of the bore in which the valve member is arranged. The fuel inlet in conventional nozzles of this type is formed in a laterally extending portion of the body 30, which portion is preferably formed integrally with the body during casting of the body.

FIG. 2 also illustrates the invention, in which the inlet is formed as a recess 33 in the body 30 and opens into a passageway 32. FIG. Furthermore, a clamping member, indicated generally at 34, is provided and includes a barrel portion 35 having an integral portion 36.

The barrel portion 35 has a central bore 37 with a slightly larger diameter than the body 30 and the boss has a threaded bore 38 into which a hollow clamping element in the form of a nut 39 is threadedly engaged. There is. A clamping element 39 is arranged around the conduit 40, the conduit having a head 41 shaped in the recess 33 and further having an annular projection, with a washer 42 disposed between this projection and the clamp nut. has been done. In use, the clamping element is tightened into the boss,
The head 41 is pushed into sealing engagement with the surface of the recess 33 to form a fuel-tight seal, and the barrel portion 35 is pulled toward the body 30 over an area opposite the recess 33. . Conduit 40 Forms a Supply Pipe Connecting to the Injection Pump The device described above presents a simple and convenient way to connect conduit 40 to an inlet in a fuel-tight manner. The body 30 can be fabricated from bar stock and does not require soldering as is the case with the nozzle shown in FIG.

In the embodiment shown in FIG. 3, the bore 36A has a threaded portion on its outer periphery and the clamping element has the form of a nut 39A engaged around a boss portion and engaged with a tubular spacer 43. It has a shoulder to transmit the tightening force between the shoulder of the nut and the head 41 of the pipe.

In the embodiment of FIG. 4, the boss 36 is constructed as in the embodiment of FIG. 2, but the conduit has the form of a threaded insert 44, which also serves as a clamping element. . The insert has an inner end shaped to form a seal with the recess 33. A nut is used to secure the pipe to the insert. In order to securely mount the insert within the boss, the portion 45 of the inner bore of the insert is configured with a non-circular cross-sectional shape for engagement with a complementary tool.

FIG. 5 shows that the insert 44 of FIG. 4 has been enlarged to accommodate an edge filter 46 or injection control means.

FIG. 6 shows that boss 36B has threaded portions on both its outer and inner surfaces and that insert 47 is mounted within this boss. The insert 47 is similar to the insert 4 of FIG.
4, and in this case the pipe is attached using a nut that engages the external thread of the boss.

In the embodiment of Figures 4.5 and 6, the clamping member is itself attached to the body once the insert is in place. If the conduit is a pipeline from the fuel pump to the clamping member, it will not be fixed for subsequent nozzle assembly. However, after assembly, it is secured to the body by crimping, and this operation is not frequently required to form a fuel-tight seal as is the case with known constructions.

The structure in FIG. 7 is basically the same as that in FIG. However, in this case, the axis of the boss 36C is inclined perpendicularly to the axis of the nozzle body 30.

[Brief explanation of the drawing]

1 is a cutaway side view of a known type of fuel injection nozzle illustrating a known method of providing a fuel inlet to the nozzle; FIG. 2 is a cutaway side view of another type of fuel injection nozzle illustrating the present invention; FIG. A side view, FIG. 3, similar to FIG. 2 showing a variant, FIGS. 4.5.6 and 7, show another version of the invention. Symbol IQ in the figure: Main body, 11: Inner hole, 12: Valve seat, 1
3... Valve member, 14... Inflow section, 15... Outflow section orifice, 16... Bush, 17... Stop plate,
18... Small diameter portion, 19... Spring holder, 20... Spring, 21... Spring holder, 22... Cap member, 23
... Retainer member, 24... Contact member, 25...
Passage, 26...pipe, 27...horizontal hole, 28...
Projection part, 29... Annular body, 30... Main body, 31...
- chamber, 32... passage, 33... recess, 34... clamp member, 35... body part, 36... integral part,
36A. B, C...Boss, 37...Central hole, 38...Inner hole, 39...Clamp element, 39A...Nut, 40
... conduit, 41 ... head, 42 ... washer,
43... Spacer, 44... Insert, 45... Inner hole portion, 46... Edge filter, 47... Insert,
shows. Representative Patent Attorney (8107) Kiyotaka Sasaki ) (and 3 others) Komoji FIG7゜

Claims (7)

[Claims] 1. an elongate body, a valve member guided for movement within the body, and a resilient device biasing the valve member into contact with a valve seat, the valve member being driven through the outlet by pressurized fuel supplied from the inlet. The body has a cylindrical form and the inflow portion has the form of a recess formed in the outer surface of the body, the nozzle includes a clamping member disposed around the body, and the clamping member defines the inner hole. and a hollow clamping element engageable with the boss, the clamping element being used to force a shaped surface into sealing engagement with the recess when the clamping element is tightened in use. and configured to tightly engage the clamp member with the body. 2. 2. A nozzle as claimed in claim 1, wherein said surface is formed on a head formed in a conduit connected in use to a fuel injection pump, and said clamping element is disposed about said conduit. 3. 3. The nozzle of claim 2, wherein said clamping element includes a nut engaged with a threaded portion formed in the surface of said bore. 4. 4. A nozzle as claimed in claim 3, wherein the clamping element is in the form of a nut engaged with a threaded portion formed on the outer circumferential surface of the boss. 5. the clamping element is formed by an insert having a peripheral thread portion engaged with a complementary thread portion formed in the bore, the insert having the shaped surface and 2. A nozzle as claimed in claim 1 having a central perforation through which fuel is channeled into said inlet in use. 6. the insert includes a portion extending from the bore;
Claim 5, wherein at least a portion of said portion has a peripheral thread portion that is engaged with a pipe connector in use.
Nozzle as described in section. 7. 6. A nozzle according to claim 5, wherein the axis of the insert is inclined perpendicularly to the axis of the body.