US2107891A

US2107891A - Fuel injector

Info

Publication number: US2107891A
Application number: US104417A
Authority: US
Inventors: George A Gillen
Original assignee: Individual
Current assignee: Individual
Priority date: 1936-10-07
Filing date: 1936-10-07
Publication date: 1938-02-08
Anticipated expiration: 1955-02-08

Description

G. A. GILLEN FUEL INJECTOR Feb. 8, 1938.

Filed Oct. 7, 1936- V GEORGE/1. GILLE/V m 2R V 0 m Patented Feb. 8, 1938 ,I1-:-UNITTED STATES PATENT OFFICE fiThis invention relates to engines of the liquid:

fuelinjection type.

c Special objects of the inventionare to provide afuelinjector'which will be of simple, sturdy design, free of complicated or delicate parts andwhich will be self-clearing so as to overcome any fouling or carbon forming tendencies.

7 These and other desirable objects are attained a why the novel features of construction, combinations and relations of parts hereinafter described, a

j illustrated and broadly claimed. P'In'the accompanying drawing a practical and at "present preferred embodiment of the invention is shown, but it will be understood thatthe actual physical structure may be modified and I changed in various ways, all within the true' intent and broad scope of the invention.

1 1 igure 1 is a'broken longitudinal sectional view lot one form of the injector.

i Figure 2 is a transverse sectional view as on I substantially the plane of line 2-2 of Figure 1. V The injector consists of but three main parts,

a stationary supply tube or nozzle 3, a surrounding piston sleeve 4 having a head or closed end 5 closing the open discharge end 6 of the nozzle tubeand a casing sleeve 1 surrounding the movable piston sleeve.

, The head of the piston sleeve is shown as extended as an annular flange 8 to overlap and engage the end 9" of the casing sleeve and as having in its inner face a cylindrical seat lllfor 1 receiving the end of the nozzle tube. The bottom of this seat is shown as conical at I l to provide clearance at the end of. the tube.

Atomizing ports I2 are shown provided in the piston sleeve back of theflange 8 and back of 'the'seat I0 so that the surrounding casing and the enclosed tube will operate as cutoffs for the opposite ends of ports l2 when the pistonsleeve is retracted as shown.

The outer end of the casing 1 is shown as formed with a cavity [3 about the piston sleeve for the reception of a retracting spring [4 which is supported at the inner end on a seat or 45 Shoulder l5 and at its outer end acts against an abutment shoulder shown as a flange l6 screwed on the outer end of the piston sleeve.

The nozzle tube 3 isv shown as supported by having an annular head portion I! at its outer 50 end screwed onto the hub portion H3 at the outer end of the casing sleeve. The latter is indicated as having a mounting flange 19 by which the structure may be secured in the engine head 20.

I 55 Liquid fuel under pressure is conducted to the are closed and sealed at both ends, at the inner ends by the supply or, nozzle tube 3 and at the stationary supply tube through suitable high pressure tubing 2| shown as connected with the end of the supply tube by screw flange 22.

In the position shown, the atomizing ports I2 of the atomizing ports [2 which then spray or atomize the liquid into the cylinder through the space then provided between the end 9 of the casing 1 and the flange 8 of the piston head. The pump for creating the piston shifting and 20 atomizing pressure is not illustrated as the structure of the same may vary widely and it may be made as a part of the injector or as a separate pump structure.

What I claim is: 25

1., A fuel injector comprising a stationary liquid fuel supply tube having an open discharge end, a piston sleeve slidable over said stationary tube and having a closed end covering the discharge end of said stationary tube and thereby sub- 30 jected to pressure of liquid in said tube, a stationary casing about said piston sleeve, a flange at the closed end of said piston sleeve for abutment with the end of said casing, said piston sleeve having a port or ports back of said flange and closed at opposite ends by said supply tube and surrounding casing when said piston sleeve is retracted against the end of the casing and means for holding said piston sleeve retracted against pressure of liquid in said supply tube.

2. A fuel injector comprising a stationary liquid fuel supply tube having an open discharge end, a piston sleeve slidable over said stationary tube and having a closed end covering the discharge end of said stationary tube and thereby subjected to pressure of liquid in said tube, a stationary casing about said piston sleeve, a flange at the closed end of said piston sleeve for abutment with the end of said casing, said piston sleeve having a port or ports back of, said flange and closed at opposite ends by said supply tube and surrounding casing when said piston sleeve is retracted against the end of the casing and means for holding said piston sleeve retracted against pressure of liquid in said supply tube, in-

eluding a spring housed within the casing about the piston sleeve, the casing having a supporting shoulder for one end of said spring and the sleeve having an abutment shoulder for the opposite end of said spring.

3. A fuel injector comprising a stationary liquid fuel supply tube having an open discharge end, a piston sleeve slidable over said stationary tube and having a closed end covering the discharge end of said stationary tube and thereby subjected to pressure of liquid in said tube, a stationary casing about said piston sleeve, a flange at the closed end of said piston sleeve for abutment with the end of said casing, said piston sleeve having a port or ports back of said flange and closed at opposite ends by said supply tube and surrounding casing when said piston sleeve is retracted against the end of the casing and means for holding said piston sleeve retracted against pressure of liquid in said supply tube, theclosed end of said piston sleeve having a seat receiving the end of the supply tube.

4. A fuel injector comprising a stationary liquid fuel supply tube having an open discharge end, a piston sleeve slidable over saidstationary tube and having a closed end covering the discharge end of said stationary tube and thereby subjected to pressure of liquid in said tube, a stationary casing about said piston sleeve, a flange at the closed end of said piston sleeve for abutment with the end of said casing, said piston sleeve having a port or ports back of said flange and closed at opposite ends by said supply tube and surrounding casing when said piston sleeve is retracted against the end of the casing, means for holding said piston sleeve retracted against pressure of liquid in said supply tube and cooperating parts at the outer end of the supply tube and easing by which said supply tube is supported in spaced relation within said casing.

5. A fuel injector, comprising a casing sleeve having an open inner end, a nozzle sleeve secured in spaced relation within said casing sleeve and having an open inner end adjacent the open inner end of the casing sleeve, a piston sleeve operating in the space between said casing and nozzle sleeves and having a closed end over the open inner end of the nozzle sleeve and an annular projecting flange overlying the end of the casing sleeve, said piston sleeve having a port or ports back of said flange in position to be closed at opposite ends .by said casing sleeve and nozzle sleeve when said piston sleeve is retracted, a retracting spring about the outer portion of said piston sleeve, an abutment shoulder for said spring on the outer end of said piston sleeve and a supporting shoulder in the outer end portion of said casing sleeve for the inner end of said retracting spring.

GEORGE A. GILLEN.