GB2190428A

GB2190428A - I.c. engine gasoline injector

Info

Publication number: GB2190428A
Application number: GB08710975A
Authority: GB
Inventors: Paul Stuart Renowden
Original assignee: Lucas Industries Ltd
Current assignee: ZF International UK Ltd
Priority date: 1986-05-16
Filing date: 1987-05-08
Publication date: 1987-11-18
Also published as: IT1204629B; GB8611950D0; GB2190428B; IT8720552A0; FR2598752A1; DE3716402A1; JPS6325366A; KR870011367A; GB8710975D0; US4813610A

Description

GB 2 190 428 A 1

SPECIFICATION orifice plate against the action of a coiled

Gasoline injector for an internal combustion engine compression spring 19 which is located within a central passage 20 in the core member. The passage This invention relates to a gasoline injector for an 20 at its end remote from the valve member internal combustion engine and of the kind 70 communicates with a fuel inlet.

including an orifice plate mounted in an injector Formed in the orifice plate in the example of body, an orifice formed in said plate, valve means Figure 1, are a pair of orifices 21 and in the closed for controlling the flow of gasoline through the position of the valve member as shown in Figure 1, orifice and a solenoid which can be energised to the valve plate obturates these orifices. The orifices open said valve means. 75 extend into the interior of a sleeve member 22 which Such injectors are well known in the art and are is secured within a tubular extension 23 of the body widely used to supply fuel to the inlet manifold or air 10. The sleeve member defines an elongate outlet inlet duct of a spark ignition engine. In use the and it projects into the air inlet method or duct of the injectors are supplied with gasoline at a pressure engine. At the end of the outlet removed from the which is very much lowerthan the pressure at which 80 orifice plate there is mounted a deflector sleeve 24 fuel is supplied to an injection nozzle of a which has an internal surface 25 which converges compression ignition engine and as a result there is towards the outer end of the outlet. The orifices 21 less energy available for the formation of a fuel are positioned such that the jets of fuel issuing spray. The orifice plate is located some distance in therefrom will flow generally parallel to the from the end of a tubular outlet through which the 85 longitudinal axis of the outlet and will strike the fuel flows from the orifice before it reaches the air surface 25 and will be deflected inwardly. In the stream. The fuel leaves the orifice as a jet and it is example of Figure 1 the orifices 21 are diametrically arranged that the jet breaks up to form a spray disposed so that the two jets of fuel after deflection exterior of the outlet where it can mix with the air by the surface 25 will converge towards each other flowing to the engine. In some engine installations it 90 and more or less at the position where they contact is required to produce two sprays of fuel or a single each other, the jets start to break up to form a spray.

large spray while at the same time using only one As a result a generally conical well atomised spray injector. 26 is produced which is larger than the spray The object of the invention is to provide a gasoline produced by a single orifice having a larger cone injector in a simple and convenient form. 95 angle, which will quickly mix with air flowing in the According to the invention a gasoline injectorfor inlet manifold or duct.

supplying fuel to an air inlet of an internal Figure 2 shows a variation in the injector shown in combustion engine comprises an orifice plate Figure 1, the deflector sleeve 2 having an internal mounted at one end of an elongated outlet which in surface 28 which inclines inwardly at a steeper angle use opens into the air inlet, a pair of orifices formed 100 than the surface 25 in the injector of Figure 1. As a in said plate, valve means for controlling the flow of result the deflection of the two jets is greater and the gasoline through said orifices, and a deflector tendency is for two conical sprays 29 to be produced surface located in said outlet for engagement by jets rather than a single spray 26 as in the example of of gasoline issuing from said orifices said surface Figure 1, the cone angles of the sprays 29 acting to deflectthe jets to produce the required 105 corresponding to the cone angle obtained with a spray pattern. single orifice. This is particularly useful where the Examples of injector will now be described with gasoline injector is mounted in a duct formed in the reference to the accompanying drawings each of cylinder head of the engine and which branches which is a sectional side elevation of part of the towards a pair of inlet valves. Conveniently the injector. 110 surface 28 of the deflector sleeve is formed as a Referring to Figure 1 of the drawings the injector series of segments as illustrated in the plan view of comprises a hollow body 10 formed from magnetic the deflector sleeve seen in Figure 2 to assist in material and which is formed with an inwardly causing interaction of the two fuel sprays.

directed flange 11. Extending within the body is a The injector which is seen in Figure 3 is tubular core member 12 and surrounding the core 115 substantially the same as that which is seen in member is a former 13 on which is wound a Figure 2 with the exception that the orifices 21 are solenoid winding which when energised causes the no longer diametrically disposed and the sprays flange 11 and the adjacent end portion of the core produced by the two jets tend to merge to form a member 12 to assume opposite magnetic polarity. single spray 30 which extends at an angle to the axis Also provided is a plate-like valve member 14 120 of the injector. This may be desirable for engines which has a central aperture 15 and a series of where it is not convenient to mountthe injector apertures 16 located in a circle about the central along the same axis as the desired fuel spray.

aperture. The valve member 14 is guided for In the injector which is shown in Figure 4 the movement within an annular spacer member 17 deflector sleeve of the earlier examples is omitted against which is located an orifice plate 18. The 125 and instead a deflector member 31 of triangular valve member is formed from magnetic material form is positioned adjacent the end of the outlet and it overlies the presented faces of the core remote from the orifice plate. Conveniently the member 12 and a portion of the flange 11 so that deflector member 31 is held in position within the when the winding is supplied with electric current, end of the sleeve 22 by a pair of pins which extend the valve member will be attracted away from the 130 through the deflector member and the sleeve. The 2 GB 2 190 428 A 2 deflector member extends transversely of the outlet 30 defining an internal surface which converges formed by the sleeve. The jets strike the surfaces of towards the end of the outlet remote f rom the orifice the deflector member to form a pair of conical fuel plate.

Claims

sprays which diverge from each other and from the 3. An injector according to Claim 2 in which said longitudinal axis of the injector. internal surface is divided into a plurality of The drawings illustrate typical angles for the 35 segments. surfaces against which the fuel jets are directed. The 4. An injector according to Claim 1 in which said actual angles depend upon the injection application. deflector surface extends generally parallel to a The surface againstwhich the jets of gasoline longitudinal axis of the injector, said orifices being impinge may be formed by the internal surface of positioned so that the jets are inclined to said axis. the sleeve member 22. In this case the orifices 21 are 40 5. An injector according to Claim 1 including a so disposed that the jets of gasoline impinge on the deflector member of triangular form which extends internal surface of the sleeve member at an angle to transversely of the outlet, said orifices being cause the required deflection of thejets. positioned so that the jets of gasoline strike two sides respectively of said deflector member at an CLAIMS 45 angle to cause deflection of said jets.

1. A gasoline injector for supplying fuel to an air 6. A gasoline injector substantially as inlet of an internal combustion engine comprising hereinbefore described with reference to Figure 1 of an orifice plate member at one end of an elongated the accompanying drawings.

outlet which in use opens at its other end into the air 7. A gasoline injector substantially as inlet, a pair of orifices formed in said plate, valve 50 hereinbefore described with reference to Figure 2 of means for controlling the flow of gasoline through the accompanying drawings.

said orifices and a deflector surface located in said 8. A gasoline injector substantially as outlet for engagement by jets of gasoline issuing hereinbefore described with reference to Figure 3 of from said orifice, said surface acting to deflect the the accompanying drawings.

jets to produce the required spray pattern. 55 9. A gasoline injector substantially as

2. An injector according to Claim 1 in which said hereinbefore described with reference to Figure 4 of deflector surface comprises an annular deflector the accompanying drawings.

sleeve which is located in said outlet, the sleeve Printed for Her Majesty's Stationery Office by Courier Press, Leamington Spa, 11187. Demand No. 8991685.

Published by the Patent Office, 25 Southampton Buildings, London, WC2A lAY, from which copies may be obtained.

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