US1848546A - of flint - Google Patents

Description

March 8, 1932. A. G. REDMOND FUEL FEEDING SYSTEM FOR MOTOR VEHICLES Filed April 30, 1 25 Fatented Mar, 8, 1932 UNITED STATES PATENT OFFICE ALBERT G. REDMOND, OF FLINT, MICHIGAN, ASSIGNOR T MARVEL CARBURETER COM- PANY, OF FLINT, MICHIGAN, A CORPORATION OF INDIANA FUEL FEEDING SYSTEM FOR MOTOR, VEHICLES Application filed April 30 1925. Serial No. 27,114.

This invention relates to a fuel feeding system for motor vehicles and is a companion application of my application filed even date herewith, patented Nov. 13, 1928, #1,691,128, the object being to provide a fuel feeding system in which a diaphragm pump is 0 erated V by a, forced feed lubricating system 0 the internal combustion engine, whereby I am able to utilize the pressure from the lubricating system of .the engine for operating a pump for raising fuel from a low level tank to a receiving chamber arranged above the charge forming device of the engine.

Another object of my invention is topro- 1B vide means for venting the receiving chamber when the electric startlng motor for the inter: nal combustion engine is operated to start the engine.

Another and furtherobject of the invention is to provide a relief valve for the pumping mechanism so that when the ressure exceeds a certain degree, the fluid W111 be returned to the suction line of the pump thereby preventing the flooding of the charge forming device.

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

n the drawings,- 7

Figure 1 is a side elevation of an internal combustion engine showing dia rammatically my improved construction of fuel feeding system thereto;

Figure 2 is a vertical section through the pumping mechanism; and

Figure 3 is a vertical section through the receiving tank and circuit maker and breaker for the electric starter.

In the drawings 1 indicates an internal combustion engine, 2 a charge forming device having the usual float chamber, 3 an air-tight receiving chamber constructed substantially.

as shown in my patent aforementioned and i having an air inlet 4 closed by a valve 5 formchamber 14 into the suction line of the pump ing the core of the solenoid 6 which is arranged in electric circuit having a source of current in the form of a battery 7, the circuit maker and breaker 8 being disposed in said circuit for controlling the flow of electrical energy to electric starter 9, which is provided with a pinion 10 adapted to engage the toothed fly wheel 11 of the motor for starting the same.

The receiving tank 3 is connected to the float bowl of the earbureter by a pipe 12 and is provided with a pipe 13 extending from a valve chamber 14 in which is mounted a check valve 15 for closing the outlet port of a chamber 16, which is provided with a check valve 17 controlling the inlet port from which extends a pipe 18'fron1 a low level reservoir 19 disposed at any suitable place preferably at the rear of the motor vehicle.

The chamber 14 is provided with an outlet 20 extending to a chamber 21 in which is moimted a spring pressed relief valve 22 and from this chamber extends pipe 23 to the pipe 18 so that fuel can flow back from the as will be hereinafter fully described.

Secured to the casting forming the chambers 14 and 16 is a cup-shaped disc 24 to which is connected a cup-shaped disc 25 between which are arranged a series of fabric discs 26 formed impervious to gasoline and oil forming a diaphragm pump. The disc 25 is provided with an extension 27 terminating in a valve casing 28 in which is mounted a snap valve 29 having a central opening 30 surrounded by a coil wire ring 31, through which extends a double conical enlargement 32 formed on a rod 33, which extends through the flexible disc and is secured to disc 34 carried thereby, said rod being surrounded by a coil spring 35, the end of the rod working in a bore formed in the casting forming the valve chambers 14 and 16.

The chamber formed by the cup shaped 90 discs 24 and 25 is in communication by a passage 36 with the valve chamber 16 so that as the diaphragm is workedback and forth, gasoline will be drawn into the chamber of the diaphragm pump on the suction stroke and forced out through said passage i0 as to deliver fuel to the receiving cham- In order to utilize the pressure of the forced feed lubricating system of an internal combustion engine for operating the diaphragm, I provide the valve casing 28 with ports 37, 38, 39. and 40 which are adapted to be opened and closed by the valve 29 as will be later described.

The ports39" and 40 are connected to open- .ings formed in the cup-shaped disc 25 by pipes 41 and 42 and the p'ort'37 is connected to the pump line of the lubricating system by a ipe 43 so that lubricant under pressure will e forced into the chamber 28 when the valve is opened. 7

The outlet port 38 of the valve casing is connected to the crank case by a .pipe 44;: so that lubricant is returned to the crank case after passing into the pump chamber to operate the diaphragm. When the valve 29 is in the position shown, the pressure of the oil in the lubricating system of the internal combustion engine is against the side' of the flexible disc so as to force the diaphragm to the right so as to compress the s ring and as the diaphragm moves to t e rlght, it carries the rod 33 with it so that the double enlargement rides through the valve andthe valve snaps or rides over the double conical enlargement so as to out off the inlet ort 37 and the outlet port 39. The pressure eing released, the spring 35 which has been com ressed on the discharge stroke of the flexi 1e diaphragm returns the diaphra m into the position shown so that the dou le conical enlargement rides through the opening of the va ve and the valve is moved into position to close the ports 38 and 40 and open the ports 37 and 39, the fluid which has been drawn into thechamber to the oil side of the diaphragm being forced out through. the port 38 to the crank case and the gasoline is sucked from the low level tank into the chamber on the opposite sideof the diaphragm so that when the diaphragm is placed in communication with the lubricating system, the pressure exerted thereby will force the diaphragm to discharge the liquid therefrom and force it to-the receiving chamber 3.

This is repeated on each suction and discharge stroke of the piston so that fuel is constantly being supplied to the receiving chamber. When the pressure of the fuel exceeds the predetermined pressure, the relief valve opens so'that the fuel instead of being forced to the receiving chamber is allowed to return to the suction line of the pump.

provided with a valve which is automatically opened when the circuit is closed to supply electrical energy to the starting,

motor.

In order to provide means for venting the chamber arranged above the charge forming device when used in connection with a motor vehicle not employing an electric starter, I use an electric circuit X having a switch so that when the switch is closed, the solenoid is energized and the valve is opened in order to allow fuel therein to flow by gravity to the charge forming device.

While in the drawings I have shown certain details of construction of the pump, I am fully aware that many changes can be made without departing from the spirit of my invention.

' What I claim is 1. A diaphragm pump comprising a sectional casing having a diaphragm arranged between the sections forming a chamber to each side thereof, one chamber being in communication with the source of supply and source of consumption, one section of said casing is provided with a projection terminating in va valve casing having an inlet and an outlet in communication with the other chamber of said pump, said valve casing having an inlet and an outlet, a valve slidably mounted in said valve casing for intermittently opening and closing said inlet and outlet, said valve having a central opening surrounded by a coil wire ring, a piston rod slidably mounted in said PI'OJGCtlOIl extending through said diaphragm and connected thereto having a double conical enlargement at one end working through saidcoll wire ring and adapted to move said valve in said valve casin to intermittently open and close the respective inlets and outlets, and a coil spring surrounding said iston rod within said casing for moving sai diaphragm in one direction.

2. A diaphragm pump for fuel feeding systems of internal combustion engines comprising a pair of cup shaped discs having a flexible diaphragm arranged between the same forming a chamber to each side thereof, one of said discs being provided with a lateral project-ion terminating in a valve casing having a removable cover, a valve casing secured to the other end of said discs having inlet and outlet valves, said valve casing being provided with a relief valve, the other chamber of said pump being provided with inlets and outlets in communication with the first mentioned valve casing, said last mensignature.

ALBERT G. REDMOND.

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