US1871989A - Pumping mechanism for fuel feeding systems for motor vehicles - Google Patents

Description

Aug. 1 6, 1932. J HElTGER 1,871,989

PUMPING MECHANISM FOR FUEL FEEDING SYSTEMS FOR MOTOR VEHICLES Original Filed May 25 1925 2 Sheets-Sheet l QM Z.

/ am "my Aug. 16, 1932. H, HEITGER 1,871,989

PUMPING MECHANISM FOR FUEL FEEDING SYSTEMS FOR MOTOR VEHICLES Original Filed May 25, 1925 2 Sheets-Sheet 2 I I (92 o I' r Patented Aug. 16, 1932 UNITED STATES PATENT FFICE' FRANK H. HEITG'ER, 0F FLINT, MICHIGAN, ASSIGNOR TO THE MARVEL CABBURETOB COMPANY, OF FLINT, MICHIGAN, A CORPORATION OF INDIANA PUMPING MECHANISM FOR FUEL FEEDING SYSTEMS FOR MOTOR VEHICLES Application filed May 25, 1925, Serial No. 32,647. Renewed May 14, 1981.

This invention relates to fuel feeding systems for internal combustion engines and more particularly to fuel feeding systems especially adapted to be used in connection with motor vehicles, the object beingto provide novel means for supplying fuel to the charge forming device of the internal combustion engine from a low level tank-so that an ample supply of fuel will be delivered to the charge forming device under all conditions. v

The main object of my invention is to provide a fuel feeding system in which a recipton is collected and' drawn rocating pump is employed having means for taking care of the leakage by the reciprocating piston and the excess amount of fuel delivered to the charge forming device.

Another and further object of the invention is to provide a reciprocating pump having a chamber in communication with the pump barrel thereof so constructed that the leakage by the piston is collected in the cham her and returned to the'inlet of the pump so that the smallamount of leakage by the pisinto the pump barrel again thereby providing a construction wherein a reciprocating piston can be used for raising the fuel from a low level tank to the charge forming device so as to overcome the difhculties now existing in using a diaphragm pump for this purpose.

Another and further object of the invention is to provide a fuel feeding system which is exceedingly simple and cheap in construction and one which can be readily installed on any of the well known makes of motor vehicles now in use, the piston being operated either electrically or mechanically.

Another and further object of the invention is to provide a fuel feeding system in which the ordinary electrical circuit used in connection with the starting and lighting system of a motor vehicle can be used for operating the electrical pump.

Other and further objects and advantages of the invention will be hereinafter set forth and the novel features thereof defined by the appended claims.

In the drawings,

Figure 1 is a side elevation partly in section showing diagrammatically the installation of my improved construction of fuel feeding systemto an internal combustion engine; and

Figure 2 is a vertical section through the pump.

In the drawings A indicates a portion of an internal combustion engine, B a charge forming device connected thereto, C an auxiliary reservoir for supplying fuel to the charge forming device by gravity, D the electrically operated pump, E the low level reservoir and F an electric battery for supplying electrical energy to the pump.

In the preferred embodiment of my invention the pump is formed of a pump barrel 1 enlarged as shown to form a chamber 2 at its upper end and having an inlet 3 at its lower end from which extend branches 4, 5 and 6. The branch 5 is provided with a spring pressed inlet check valve 7 and the branch 4 is provided with a spring pressed outlet check valve 8, the valves 7 and 8 being arranged in valve casings formed in the branches as clearly shown by the use of couplings 9 and 10 to which are connected inlet and outlet pipes 11 and 12, inlet pipe 11 being connected to the low level tank E and the outlet pipe 12 extending upwardly into the auxiliary reservoir C and terminating short of the top thereof as clearly shown.

The auxiliary reservoir C is provided with an outlet pipe 13 which is connected to the bowl B of the charge forming device, the inlet being controlled by the usual float controlled valve as clearly shown so that as the fuel is consumed by the charge forming device, the fuel in the float chamber of the charge forming device will be maintained at a constant level. Y

The branch 6 is in communication with a valve chamber 14 formed in the lower end of an overflow chamber 15 which is in communication with the annular enlargement 2 by a passage 16 and mounted within the valve chamber 14 is a spring pressed valve 17, the tension of the spring holding the valve seated being slightly less than the tension of the spring used for holding the valve 7 seated. so that in the operation of the pump as will be hereinafter fully described, the valve 17 will open in advance of the valve 7 in order to allow fuel to be drawn from the overflow chamber 15 into the barrel of the pump.

The overflow chamber 15 is closed by a plug 18 provided with a vent 19 and having an opening through which a rod 20 extends carried by a float 21 which is provided with a valve 22 for closing the outlet formed in' the bottom of the overflow chamber as clearly, shown and for the purpose hereinafter fully described.

The rod carries a stop 20' which limits the up ard movement of the float and the chamher is provided with an auxiliary inlet 23 which is connected by pipe 24 with an outlet 25 formed in the top of the auxiliary reservoir C so that when the level of the fuel within the auxiliary reservoir C reaches the outlet, fuel will flow from the auxiliary reservoir into the overflow chamber 15 whereby the fuel in the auxiliary reservoir will be maintained at a predetermined level.

Secured to the upper end of the pump barrel is a tube 26 which is closed at its upper end by a plug 27 and said tube is surrounded by a casing 28 in which is arranged a coil 29. The casing 28 is closed by a cover 30 on which is mounted a bracket 31 substantially inverted U-shaped and provided with spaced ears 32 between which is pivotally mounted an arm 33 carrying a contact point 34 which is adapt ed to engage a fixed contact 35 carried by post 36, said contact 35 being electrically connected to one end of the coil 29 and the other end of the coil is connected by a wire 40 to an electric battery 41. The movable contact 34 is in electrical circuit with. the battery 41 by wire 42 and in this line is arranged a switch 43 adapted to be mechanically operated so as to open and close the electric circuit for the solenoid.

Mounted within the pump barrel is a piston 44 having a reduced portion 45 to prevent creeping of gasoline which has worked past the piston, the upper end of the piston being enlarged and forming the core of the solenoid and being provided with a vertical bore 46 closed by a plug 47 which is apertured and through which a rod 48 extends.

The rod 48 is provided with a head 49 at its lower end and extends upwardly through an aperture formed in the plug 47 and carries a cross pin 50 working in a slot 51 of the arm 33 as clearly shown. The rod also passes through an opening formed in the inverted U-shaped bracket 31 and carries a collar 52 and is surrounded by a coil spring 53 betweenthe collar and the bracket as clearly shown.

Disposed within the tube 26 above the uper end of the core is a coil spring 54 which is adapted to be compressed on the upward stroke of the piston so that when the electrical circuit is broken, the spring will force the piston downwardl so as to discharge the fuel from the lower en of the pump barrel which has been sucked therein on the upstroke of the piston. I

The rod 48 forms an auxiliary core for the solenoid so that when the electrical circuit is completed throu h the core of the solenoid, the rod is held in its lower position so as to hold the contacts 34 and 35 firmly together in order to complete the circuit so that the electrical energy will be supplied to the coil which raises the p ston.

' In Figure 2, I have shown the electric circuit completed and the piston has just about completed its suction stroke, and the head 49 of the rod 48 has been engaged by the bottom of the core formed on the upper end of the piston and 'aslight further upward movement raises the rod 7 and separates the contact points so as to break the electrical circuit.

It is, of course, understood that the upward movement of the piston compresses the spring 54 and by the weight of the piston and the action of the spring fuel which has been drawn to the lower portion of the pump bar-.

rel is discharged through the outlet thereof and delivered into the auxiliary reservoir.

On the down stroke of the piston the plug 47 engages the head 49 of the rod 48 so as to pull the rod down with the piston and bring the contacts 34 and 35 into engagement with one another to complete the electric circuit and as long as the current is on, rod 7 will be energized so as to hold the contacts together.

This downward movement of the piston and rod compresses spring 53 so that when the contacts are broken on the initial movement of the suction stroke, the spring will have the tendency to further separate the contacts so as to hold the contacts separated until the piston reaches the limit of its downward movement where the circuit will be again completed so that thepump operates continuously, the circuit being completed on its discharge stroke and broken on its suction stroke.

As the pump is operating continuously, fuel is being drawn fromthe low level tank and delivered to the auxiliary reservoir from which it is fed to the carbureter by gravity,

the leakage of fuel past the piston into the mains within the receiving chamber, but just as soon as the fuel is exhausted, the pump will operate to raise the fuel from the low level crate again, this fuel tank, whereby a constant suppl of fuel is provided for the charge forming evice under all working conditions of the motor.

It is, of course, understood that when there is only a small amount of fuelwithln the receiving chamber, the float is in a lower position so as to cut off the outlet thereof and this receiving chamber does not operate to deliver fuel to the pump until the fuel is raised beyond a predetermined level therein.

In the embodiment of the invention thus far described, it will be seen that I have provided an electrically operated pump used in connection with an internal combustion engine having a charge forming device wherein the electrical energy ordinarily used in connection with motor vehicles is employed whereby a solenoid is arranged in electrical circuit and automatic means is provided for intermittently making and breaking the circuit by the movement of the piston of the pump in connection with means for collecting the leakage of fuel past the piston and the over-supply of fuel from the auxiliary reservoir so that this fuel is returned to the pump line, thereby overcoming any waste and overcoming all the difficulties now existing with piston operated pumps used in connection with fuel feeding systems for motor vehicles.

In carrying out my invention I preferably employ a collecting chamber having a capacity equal to the capacity of the pump barrel of the pump so that when the pump stops operating when at the end of its suction stroke and the piston gradually returns, the fuel within the pump barrel working past the piston will be collected in the collecting chamber so that when the pump starts to opwill be pumped into the auxiliary reservoir or the fuel bowl of the charge forming device, as the case may be.

From the foregoing description it will be seen that I have provided a fuel feeding system having a pump for raising fuel from a low level tank to the charge forming device so as to supply an ample amount of fuel to the charge forming device under all engine speeds and loads, means being provided for collecting the fuel which leaks past the piston so that I am able to use a piston pump in place of a diaphragm pump.

at I claim is 1. A pumping mechanism for fuel feeding system for motor vehicles comprising a pump having a pump barrel provided with a chamber at its upper end, said pump barrel being provided with a valve controlled inlet and outlet, a piston movably mounted within said pump barrel, means for raising said piston, means for returning said piston to its original position, a collecting chamber in conimunication with the chamber of said pump barrel for collecting the liquid passing said aevaeee piston, a float having a valve for controlling the outlet ofisaid collecting chamber, and a valve for preventing fuel from entering said collecting chamber from the discharge of said pump 2. A pumping mechanism for fuel feeding system for motor vehicles comprising a pump having ber at its upper end, said pump barrel being provided with a valve controlled inlet and outlet, a piston movably mounted within said pump barrel, means for raising said piston, means for returning said piston to its original position. a collecting chamber in communication with the chamber of said pump barrel for collecting the liquid passing said piston, aispring-pressed valve for controlling the outlet of said collecting chamber and a float controlled valve for controlling the outlet of said collecting chamber. 7

3-. In a pumping mechanism for fuel feeding systems for motor vehicles having a low level main fuel supply reservoir and a high level auxiliary reservoir, of a pump comprising a pump barrel provided with a movable wall, means for operating said wall for raising fuel from the low level reservoir to the high level reservoir, said pump being provided with a valve controlled inlet and a valve controlled outlet, an auxiliary reservoir in communication with the high level reservoir, said auxiliary reservoir being in communication with said pump barrel between the valves controlling the inlet and the outlet, said auxiliary reservoir being provided with means for closing the outlet thereof after fuel has been drawn therefrom by the suction stroke of the pump and for closing said outlet on the discharge stroke of the pump.

4. In a fuel feeding system for internal combustion engines having a charge forming device connected thereto, a pump for raising fuel from a low level tank to an elevated tank for feeding fuel to said charge forming device, said pump being provided with inlet and outlet valves, a receptacle in communication with said pump and said elevated tank, a check valve for cutting off communication between said receptacle and said pump on the pressure stroke of the pump and a float operated valve in said receptacle for cutting off communication between said elevated tank and said pump.

5. In a fuel feeding system for internal combustion engines having a charge forming device, the combination with-a pair of tanks arranged in different horizontal planes, one of said tanks being ada ted to feed fuel to said charge forming device bv gravity. of a pump for raising fuel from the low level tank to the elevated tank provided with inlet and outlet valves, an auxiliary reservoir adapted to receive fuel from an overflow extending from said elevated reservoir, said auxiliary reservoir being in communication a pump barrel provided with a chamadapted to receive with said pumpin means between the inlet and outlet valves t ereof, means for cutting off communication between said reservoir and pump on the power stroke thereof.

6. In a fuel feeding system for internal combustion engines having a charge forming device connected thereto, an elevated tank for feeding fuel to said charge forming device, a low level tank, a pump for raising fuel from said low level tank to said elevated tank, said pump being provided with inlet and outlet valves, in communication with the elevated tank and being in communication with the pump between the inlet and outlet valves thereof and a float mounted in'said auxiliary reservoir for closing the outlet thereof when the fuel drops below a predetermined level and means for closing the outlet of said auxiliary reservoir on the pressure stroke of the pump.

In testimony whereof I hereunto aflix my signature.

FRANK H. HEITGER.

from, said reservoir an auxiliary reservoir the overflow of fuel therea

Images