US2829631A - Electric induction gasoline fuel injector - Google Patents

Description

April 8, 1958 T. M. WILT 2,829,631

, ELECTRIC INDUCTION GASOLINE FUEL INJECTOR Filed Feb. '8, 1957 ATTDRN EYE United States Patent ELECTRIC INDUCTION GASOLINE FUEL INJECTOR Thomas M. Wilt, White Bear Lake, Minn. Application February 8, 1957,Serial No. 638,972

6 Claims. (Cl. 123-139) This invention relates to fuel injection devices of internal combustion engines, and in particular a solenoid actuated fuel injector with the solenoid energized by induction coils around the high tension wires from the distributor to the spark plugs whereby fuel is supplied to the cylinders of the engine at high pressure.

The purpose of this invention is to utilize the high ten sion current of wires carrying the current from the distributor to the spark plugs by taking the current by induction for energizing solenoids of fuel injectors injecting fuel under pressure to cylinders of the engine upon which the distributor is positioned.

In the operation of conventional internal combustion engines high tension current is supplied by a distributor to spark plugs of the engine for producing current to jump the spark gaps and this invention takes some of this high tension current, by induction, and supplies current to solenoids for actuating high pressure injectors whereby fuel is forced under pressure into the cylinders of the engine.

The object of this invention is, therefore, to provide means for utilizing the high tension current supplied to spark plugs of an internal combustion engine for operating a fuel injector for each cylinder of the engine without influencing conventional operation of the engine.

Another object of the invention is to provide fuel injectors actuated by high tension current taken by induction from wires supplying current to spark plugs of an internal combustion engine in which the injectors are adapted to be installed in heads of motor vehicles now 1n use.

A further object of the invention is to provide means for using high tension current passing from a distributor of an internal combustion engine to spark plugs of the engine for injecting fuel under high pressure into the engine in which the device is of a simple and economical construction.

With these and other objects and advantages in view the invention embodies coils positioned around wires leading from a distributor to spark plugs of an engine and mounted adjacent the distributor and solenoid actuated plunger type injectors with the solenoids connected to the induction coils and with plungers actuated by the solenoids positioned to draw fuel into chambers thereof in return movements of the plungers in which the plungers are returned by springs and wherein the fuel is injected as the solenoids are energized by the plungers through nozzles into the cylinders of the engine.

Other features and advantages of the invention will appear from the following description taken in connection with the drawing, wherein:

Figure 1 is a diagrammatic view illustrating a method of connecting induction coils around spark plug leads of an internal combustion engine whereby the coils are connected to coils of solenoids of plungers in fuel injectors for injecting fuel into cylinders of an engine under pressure.

Figure 2 is a side elevational view of a distributor of an internal combustion engine showing induction coils positioned around spark plug leads thereof.

Figure 3 is a vertical section through a solenoid actuated fuel injector showing the plunger of the injector in the open or fuel receiving position.

Figure 4 is a view similar to that shown in Fig. 3 showing the plunger actuated by the solenoid for injecting fuel into a. cylinder.

Referring now to the drawing wherein like reference characters denote corresponding parts the improved induction coil actuated fuel injector of internal combustion engines of this invention includes induction coils positioned around spark plug leads 11 of a distributor 12 and injectors 13 having solenoid coils 14 therein with plungers 15 positioned to draw fuel into chambers 16 through intake valves 17 and inject the fuel into cylinders through nozzles 18.

The solenoids 14 are mounted in inner annular recesses 19 in the bodies 13 of the injectors and the plungers 15, which are slidably mounted in the chambers 16, are provided with heads 20 that are surrounded by the coils of the solenoids and that are urged upwardly by springs 21 when the solenoids are deenergized. As current is cut off through the solenoids the springs 21 urge the heads 20 of the plungers 15 upwardly against stops 22 of caps 23 which are threaded on outer surfaces of the bodies 13 and which are retained in adjusted positions with set screws 24. The caps 23 are adjustable, being threaded on the bodies 13 whereby the caps may be set to control the movements of the plungers thereby regulating the area of the chambers 16.

. The valves 17, which control the flow of fluid from supply pipes 25 to the chambers 16 are provided with threaded shanks 26 by which they are installed in threaded sockets 27 in the bodies 13 and the shanks are provided with valve seats 28 against which balls 29 are urged by springs 30 in chambers 31 of the shanks and the chambers 31 are provided with openings 32 that provide communication between the chambers 31 and chambers 16. Upon downward movements of the plungers the balls 29 are forced against the valve seats 28 and upon return movements of the plungers by the springs 21 the balls 29 are drawn away from the seats 28 permitting fuel to be drawn inwardly through the tubes 29 into the chambers 16.

Also upon downward movements of the plungers 15 balls 33 are forced away from seats 34 opening ports 35 whereby fuel is injected through the nozzles 18 into the cylinders.

The body 13 of each injector is provided with a threaded shank 36 that is threaded into an opening 3'7 and the nozzle 18 is positioned in a recess. 38 in the end of the shank. The nozzle is also provided with a spring 39 that holds the ball 33 against the seat 34 except when the ball is forced away from the seat by downward movement of the plunger.

In the diagram illustrated in Fig. l the arm 40 of the distributor is positioned to engage contact points 41 of the spark plug leads 11 and the coils 10 extended around the leads are connected by wires, such as the wires 42 and.43 to coils of the solenoids 14 whereby an induction coil of one lead provides current to a solenoid of an injector of the second cylinder following. It will be understood that the induction coils may be connected to the solenoid of any suitable injector, depending upon the timing of the engine.

The coils of the solenoids are insulated from the bodies of the injectors and plungers by sleeves A4 or by other suitable means.

It will be understood that modifications, within the scope of the appended claims, may be made in the design and arrangement of the parts without departing from the spirit of the invention.

What is claimed is:

1. A fuel injector comprising a body having a cylindrical chamber-therein, an inlet valve mounted in the body and opening into the chamber, an outlet valve also mounted in the body and opening into the chamber, a plunger slidably mounted in the chamber, a solenoid in the body and positioned to actuate the'plunger and an induction coil formed to be positioned around a spark plug lead of a distributor of an engine for supplying current to the solenoid.

2. A fuel injector comprising a body having a cylindrical chamber therein, an inlet valve mounted in the body and opening into the chamber, an outlet valve also mounted in the body and opening into the chamber, a plunger slidably mounted in the chamber, a solenoid in the body and positioned to actuate the plunger and an induction coil for supplying current to the solenoid, said induction coil being adapted to be positioned around a spark plug lead of a distributor of an internal combustion engine.

3. A fuel injector comprising a body having a cylindrical chamber therein, an inlet valve mounted in the body and opening into the chamber, an outlet valve also mounted in the body and opening into the chamber, a plunger slidably mounted in the chamber, a solenoid in the body and positioned to actuate the plunger and an induction coil for supplying current to the solenoid, said induction coil being adapted to be positioned around a spark plug lead of a distributor of an internal combustion' engine, and said injector body being adapted to be threaded into an opening in the Wall of a cylinder providing fuel supply means to the cylinder.

4. In a fuel injector, the combination which comprises a cylinder block, a distributor, spark plugs in the cylinder block, an injector body threaded in the cylinder block and opening into a cylinder therein, a check valve in the injector body and positioned to permit passage of fuel from the injector body into the cylinder, said injector body having a cylindrical chamber therein and said check valve opening into said chamber, a fuel inlet check valve also mounted in the body and opening into the chamber, a plunger slidably mounted in the chamber of the injector body, a solenoid in the injector body positioned to urge the plunger to force fuel under pressure into the cylinder upon energization thereof, resilient means for returning the plunger, and induction coils positioned around leads of the distributor to the 4 spark plugs and connected to the solenoids of the injector bodies.

5. In a fuel injector, the combination which comprises a cylinder block, a distributor, spark plugs in the cylinder block, an injector body threaded in the cylinder block and opening into a cylinder therein, a check valve in the injector body and positioned to permit passage of fuel from the injector body into the cylinder, said injector body having a cylindrical chamber therein and said check valve opening into said chamber, a fuel inlet check valve also mounted in the body and opening into the chamber, a plunger slidably mounted in the chamber of the injector body, a solenoid in the injector body positioned to urge the plunger to force fuel under pressure into the cylinder upon energization thereof, resilient means for returning the plunger, means for adjusting the travel of the plungers in the injector body, and induction coils positioned around leads of the distributor to the spark plugs and connected to the solenoids of' the injector bodies.

6. In a fuel injector, the combination which comprises an internal combustion engine block having cylinders therein, a distributor having contacts therein, leads connecting the contacts of the distributor to spark plugs of the cylinders of the engine block, induction coils positioned around the leads from the distributor to the spark plugs, an injector body having a cylindrical chamber therein threaded in the Wall of a cylinder of the cylinder block, a plunger positioned in the chamber of the injector body, a nozzle in the passage of the injector body, a valve seatin the passage, a spring actuated valve positioned to coact with the valve seat for closing the passage upon the return travel of the plunger in the cylinder, an inlet passage extended through the injector body and opening into the chamber in which the plunger is positioned, a spring actuated valve in the inlet connection positioned to prevent return of fluid through said inlet connection, a solenoid in the injector body connected to one of the induction coils around the spark plug leads and positioned to drive the plunger into the chamber of the injector body for forcing fuel from the chamber to the passage and into the cylinder, a spring for returning the plunger to a charging position, and a cap threaded on the injector body and having a stop therein for adjusting the travel of the plunger.

1,072,712 France Mar. 17, 1954

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