US2445269A - Combined injector nozzle and filter - Google Patents

Description

July 13, 1948. J, F, HQFr-ER 2,445,269

A` COMBINED INJEcTon NozzLE AND-Hmm original Filed karen 1, 19:59

Patented July 1'3, 194s COMBINED INJECTOB NOZZLE AND FILTER James F. nouer, Detroit, Mien., minor to Ex Cell- Corporation, Detroit, Mich., acorporation of Michigan oriana! application Marsh 1, use, serial No.

259,088. Divided and this application May 6, 1944,- sernl No. 534,440

The present invention relates to improvements in nozzles adapted particularly for delivering timed metered injections of liquid fuel in connection-with the operation of internal combustion engines.

One of the objects of the invention is to pmvide a new and improved fuel injection nomic having a safety oli filter located in proximity to the nozzle tip.

Another object is to provide a novel fuel injection nozzle having a holder which encloses a safety oil filter in the path of the. fuel flow to the nozzle tip and in which the filter is secured in position without the `use of threads or gasket connections v directly with the tip.

4 Chilnl. (Cl. ZIO-134) with a central opening or bore il terminating j While the invention is susceptible of various modifications and alternative constructions, vI

. have shown in the drawings and will herein decharge end with an end wail l having a small discharge bore t coaxial with the bore 4.- An

external peripheral mounting flange 1 is formed on the base end of the body I.

Closely fitted within the bore 4 is a valve scat member I having an inner end surface l in pressure tight engagement with the inner surface Il of the end wall I about the bore 6. yThe valve seat member I is tubular in form to provide an axial passage or bore Il, and projects from the open end ofthe tip body 2 for fluid tight connection to the source of fuel supply. The inner end of the seat member l has an endwall i2 formed in an annular valve seat il.

A pintle i5v extends slidably through the disf charge bore i and coacts v therewith to define a discharge orifice means having suitable fuel discharge characteristics for proper atomization and penetration. The pintle i5 consists of a cylindrical stem which is formed adjacent its outer end portion with a spray control form consisting ofl a narrow cylindrical area It of full pintle diameter, a control cone i1 tapering inwardly from the area il, and an outer cone il able in a counterbore or chamber 2| in the inner end of the bore-6 is a peripheral rib 22. The rib 22 defines a conical abutment shoulder 23 adapted for engagement with a fixed conical stop shoulder 24 at the end of the counterbore 2i to limit Referring more particularly to the drawings,

one form of fuel injection nozzle embodying features of the present invention (Fig. 1) comprises a replaceable nozzle unit or tip i removably mounted in a holder 2. It will be .understood that v ,l the nozzle tip i is adapted to be clamped or secured by ymeans of the holder 2 to the engine (not shown) at the desired point of injection.

The nozzle tip i may be of any suitable character and in the present instance of the .type

' disclosed in my copending application Serial No.

the opening movement of the pintle il.

' A free path of fuel flow from the valve il, 2l

`fuel issuing from the passages 2t.

A coil compression spring 21 is mounted within the seat member l and at one end impinges against the inner surface of the wall i2, and is centered bythe end of the bore il which is reduced inv diameter asindicated atv 2l. vAt the other end, the spring 21 impinges against a hanger 2l slidably disposed in the bore ii and suitably anchored to the pintle II. In the preferred form,

the pintie I9 is provided with an elongated shank Il having an enlarged head 3i at its free inner end. The hanger consists of a circular disk having an axially offset portion which serves to center the adjacent end of the spring 21, and which defines an outwardly opening socket 32 having a central opening 89 to receive the shank 3l. The opening 39 is larger than the shank il to provide clearance permitting limited angular adjustment of the hanger 29 to the end plane of the spring 21. A clearance hole I4 of sufficient size to receive the head 3l intersects one side of the opening 33 to permit assembly of the hanger 29 and the shank 30. When the parts are assembled as shown, the socket 32 is in pilot engagement with an abutment shoulder 35 on the.-

base of the head 3|. A plurality of peripherally spaced notches 3i are formed in the hanger disk 29 and supplement the opening 33 to provide an adequate area for unrestricted fuel flow past the hanger.

The holder 2 is adapted to support the nozzle tip l in operative position to inject fuel into a combustion lchamber (not shown), and to connect the tip to a fuel supply line leading from a suitable fuel source. In the form shown. the holder 2 comprises an outer body or housing 31 which preferably consists of an elongated generally tubular shell having a longitudinal bore Il and an external peripheral hexagonal mounting flange 39. One end of the body 31 is formed with an inner peripheral flange 40 for holding the nozzle tip I and has an end surface 4I adapted to be clamped through a vgasket (not shown) against a mating surface (not shown) in the engine cylinder head (not shown) to provide a gastight seal. A clamp plate 42 closely encircles the outer end of the body 31fand engages the outer end of the 'mounting flange 39. The plate 42 is formed at oppositesides of the body I1 with suitable holes 4'3 through which bolts (not shown) may be inserted to clamp the holder 2 in position.

The mounting flange 1 of the nozzle tip I is positioned against thev inner surface 44 of the flange 40, a suitable gasket 45`belng interposed therebetween, and the tip projects through the fiange 40 to extend into the combustion chamber of the engine. Removably inserted into the holder body 91 is a cylindrical filter holder 49 having an axial stem 41 on one end extending into the inner end of the bore II of the valve seat member l, and having an axial bore or passage 4l opening therethrough. The inlet end of the bore 49 is formed with two counterbores 49 and SII in which a fuel filter I is removably mounted. The fllter holder 46 is formed on one end at the base of the stem 41 with aconical abutment 62 adapted for fluid-tight engagement with an annular mating surface 53 on the inner-end of the valve seat B coaxial with the bore II. A nut I4, with an outer hexagonal head 55 and an axial bore 56 opening therethrough, is threaded into the outer end of the bore 39 of the holder body 31, and is formed on the inner endvwith a coaxial conical abutment surface 51 in fluid-tight engagement with a mating surface 5l on the filter holder 46. It will be seen that when the nut 54 is tightened, it will clamp the nozzle tip I and the filter holder 4`6 securely in position within the holder 2 while maintaining communication between the alined bores II, 49 and 59.

High pressure tubing from a fuel injection pump or other fuel source may be suitably connected to the outer end of the nut 54. In the present instance. ahollow fitting 59 is removably clamped with a pressure-tight seal against the outer end of the nut 54 by a bolt 99 threaded into the outer end of the bore 59. The fitting Il loosely encircles the shank of the bolt 4l. and has a laterally extending threaded nipple 0I adapted to be connected to the tubing. The outer end of the nut 54 and the head of the bolt 40 are formed with opposed coaxial conical abutment surfaces 92 and 93 adapted for pressure-tight engagement with mating surfaces 94 and 6l in opposite sides of the fitting 59. It will be seen that when the bolt 80 is tightened, the fitting Il will b'e clamped securely in position. The bolt 60 is formed with an axial bore 49 which opens to the counterbore 50, and which is connected through a plurality of intersecting radial ports 91 in the shank of the bolt to the interior of the fitting 69.

The filter 5I may be of any suitable character, and preferably is of the disk type. In the form shown. the filter 5I comprises a cylindrical body 68 with a seal ring 99 fitted tightly within the counterbore 49. A plurality of filtering disks 1I are clamped in coaxial relation to the body Il within and in4 peripherally spaced relation to the counterbore 50. v

In operation, fuel supplied from the source passes through the fitting 59, the ports 61. the bore 66, the filter 5I and the bore 49 to the nozzle tip I. The holder 2 permits the filter 5I to be installed without removing the nozzle tip I from the engine. Being mounted directly in the nozzle holder 2, the filter 5I is located close to the tip I, and requires no threaded connections.

I claim as my invention:

1. A fuel injection nozzle comprising, in combination, a holder having an external cylindrical casing formed in one end with an internal peripheral flange, a nozzle tip removably mounted in said one end of said casing and having an external peripheral flange engaging said first mentioned flange and having an axial inlet bore, a cylindrical filter holder removably inserted in said casing and having an axial stem inserted in said bore, said holder being formed with an axial passage opening therethrough and communicating at the discharge end with said bore and formed with an enlarged stepped counterbore in the inlet end of said passage, a nut threaded into the other end of said casing ,and serving to clamp said casing, nozzle tip and filter holder rigidly in lassembled relation and formed with an inlet passage opening to said counterbore and adapted to be connected to a source of fuel, and a filter removably inserted in said counterbore.

2. A fuel injection nozzle for internal combustion engines comprising, in combination, a holder having anexternal elongated casing formed in one end with an internal flange, a nozzle tlp removably mounted in and projecting from said one end of said casing and having an external peripheral flange engaging said first mentioned flange and an inlet bore. a cylindrical filter holder removably inserted in said casing and formed with an axial passage opening therethrough and communicating with said bore and with an enlarged counterbore in the inlet end of said passage, said inlet end of said passage being adapted to receive fuel from a fuel source. a nut threaded to said casing and serving to clamp said casing, nozzle tip and filter holder rigidly in assembled relation. and a filter removably inserted in said counterbore.

3. A fuel injection nozzle for internal combustion engines comprising, in combination, a

holder having an external elongated casingfa nozzle tip slidably mounted in and projecting from one end of said casing and having a fuel inlet, a filter holder slidably inserted in said casing in separable end to end fluid-tight engagement with said tip and formed with a longitudinal passage opening therethrough and enlarged at one end and communicating with said inlet, means threaded into the other end of said casing into end to end 'fluid-tight engagement with said iilter holder serving to clamp said casing, nozzle tip and filter holder rigidly in assembled relation, and a iilter removably inserted in said enlarged end of said passage.

4; A fuel injection nozzle for internal combustion engines comprising, in combination, a holder having an external elongated casing, a nozzle tip slidably mounted in and projecting from one end of said casing and having a fuel inlet, ,a iilter holder slidably inserted in said casing inseparable end to lend engagement with4 REFERENCES CITED The following references are of recordin the le of this patent:

UNITED STATES PATENTS 15 Number Name Date 247,151 Beggs Sept. 20, 1881 1,835,047 H111 Dec. 8, 1931 2,062,362 Hubbard Dec. 1, ,1936 2,068,837 -Aronson Jan. 26, 1937 n 2,134,413 Munoz Oct. 25. 193i! Hoffer July 28, 1942

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