US1663611A - Fuel-feeding means for charge-forming devices - Google Patents

Description

March 27, 1928;

A. G. REDMOND FUEL FEEDING MEANS FOR CHARGE FORMING DEVICES Filed Jan 5, 1923 2 Sheets-Sheet 1 gwueflto'c nu u z o .r. t a

2 Shete-Sheet 2 C] (To A. G.'REDMOND Filed Jan. 5, 1923 March 27, 1928.

FUEL FEEDING MEANS FOR CHARGE FORMING DEVICES Patented Mar. 27, 1928.

' UNITED STATES PATENT OFFICE.

ALBERT G. REDMOND, or mnmnarous, manna, assrenon raancrs, or FLINT, MICHIGAN.

DO JACOB RIOHAI FUEL-FEEDING MEANS FOR CHARGE-FORMING- DEVICE-i5.

Application filed January 8, 1928. Serial No. 610,470.

This invention relates to certain new and useful improvements in fuel feeding means for charge forming devices and is an improvement on my application filed August 18, 1922, Serial Number 582,574, the object being to provide novel means for operating the pump for raising the fuel from the main fuel tank to the bowl of the charge forming device or carburetor.

Another object of my invention is to provide an air pump operated by the internal combustion engine and so timed that on every twenty revolutions of the engine, the piston of the air pump will be operated so as to force air into a cylinder beneath a piston which is connected to the pump piston in such a manner that the pump piston will be raised and allowed to drop so as to force the fuel to the charge forming device.

A still further object of the invention is to provide a construction of fuel feeding means which can be manufactured cheaply and quickly installed on any of the well known types of internal combustion engines now in use.

Another and further object of the invention is to provide fuel feeding means in which the pump for forcing the fuel to the charge forming device is disposed within the 30 main fuel supply tank so as to prevent leakage in any way and to provide a construction which can be readily installed in any of the well known types of fuel tanks now in use.

Other and further objects and advantages of the invention will be hereinafter set forth and the novel features thereof defined by the appended claims. 1

In the drawings,

Figure 1 is a side elevation of an internal combustion engine showing the application of my improved construction of fuel feeding means thereto;

Figure 2 is a detail vertical section of a portion of a crank case of the internal combustion engine showing the manner of attaching the air pump and driving the same from the internal combustion engine;

Figure 3 is a detail perspectiiew of the driving means for the air pun and Figure 4 is a vertical section through my improved construction of fuel pump positioned within the main fuel supply tank.

In the drawings 1 indicates an internal combustion engine, 2 the intake manifold, 3 the charge forming device and 4 the main fuel supply tank which is generally located to the rear of the motor vehicle in which the nternal combustion engine is installed and in a lane below the charge forming device, the a ov e description being iven so that the application of my improve construction of fuel feeding means can be readily understood.

l )is osed within the fuel tank 4 is a pump cylm er 5 provided with a depending intake pipe 6 and a lateral nipple 7 to which is connected a valve casing 8 provided with a check valve 9. Connected to the Valve casing 8 is a fuel p1pe.10 which extends upwardly and out through a cap plate 11 and has its other end connected to the fuel bowl of the charge forming device. The lower end of the pump cylinder is provided with a check valve 12 controlling the intake of fuel and it will be noticed that the pipe extends down close to the bottom of the fuel tank so that prac-,

tically all of the fuel in the fuel tank can be consumed.

The pump cylinder 5 carries a pipe 13 which extends through the cover plate 11 of the tank 4 and is provided with an air cylinder 14 at its end, the top of which is closed by a cover 15 which is provided with a vent 16.

Slidably mounted within the air cylinder 14 is a piston 17 carrying a piston rod 18 which is connected to a fuel pumping piston 19 mounted within the ump cylinder 5, the downward movement of which is limited by a stop 20. The piston 19 is provided with a vertical bore 21 and connected to the pump of the cylinder is a pipe 22 which is connected to a valve casing 23 secured to the lower end of an air pump 24, the valve casing being provided with a spring-held ball check valve 25.

Theair pump 24 is secured to the crank case of the internal combustion engine as clearly shown in Figure 1 and is provided with an inlet valve casing 26 provided with a spring-pressed ball check valve 27, the valve casing extending through a suitable opening formed in the crank case as clearly shown in Figure 2 so that the air drawn in by the pump will be taken from the interior of the crank case in order to keep the pump thoroughly lubricated.

Supported within the cylinder of the air pump 24 by a coil 28 is a hollow piston 29 which is provided with an enlarged head portion 30 working in an enlarged upper end of the pump casing, said head bein adapted to be engaged by a cam 31 carri by a shaft 32 provided with a worm wheel 83 which meshes with a worm 34 formed on a revolving shaft 35 of the internal combustion engine and may be the cam shaft of the internal combustion engine or any other revolvin shaft.

By this construction the iston 29 is reciprocated so that air will e. drawn from the interior of the crank case and forced into the cylinder 14 so as to raise the main or pumping piston 19. As the piston 17 1S raised by' the air forced in beneath the same, the fuel pumping piston is raised and as the air pump is operated preferably every twenty revolutions of the internal combustionengine, the pumping piston will be raised every twenty revolutions and allowed to drop by its own weight as the air bypasses the piston 17 through the passage 23 so as to allow the piston of the main fuel pump to drop by gravity to displace the fuel within the pump cylinder so as to force it through the pipe 10 into the bowl of the charge forming device.

The weight of the piston is determined by the pressure exerted on theneedle valve by the float in the fuel bowl of the charge forming device so that fuel is maintained in the pipe line under pressure at all times to enable the fuel to flow instantaneously into the bowl of the charge forming device when the fuel therein drops below a predetermined level.

lVhen the air is forced by the air pump driven by the internal combustion engine and timed thereby into the cylinder 14 disposed upon the main fuel supply tank, the fuel pumping piston is raised and allowed to drop by its own Weight and as the pump cylinder is provided with check valves, the fuel is drawn into the pump cylinder and forced outwardly by the piston, the stroke of the piston being determined ldy the consumption of fuel by the internal combustion engine as the piston is held by the pressure of the fluid within the cylinder in different positions so that the stroke of the piston; is determined by the consumption of fue I .am aware that instead of relying on the weight of the piston to force the fuel from the pump cylinder to the charge forming device a calibrated spring could be placed above the piston so that after being raised, the spring would exert the desired pressure to maintain the fuel under pressure at all times and therefore I do not wish to limit myself to the use of a piston having a predetermined weight for obtaining the desired result.

What I claim is 1. The; combination with an internal combustion engine having a charge forming device and a main fuel supply located in a plane below said charge forming device of a. pump disposed in said fuel supply tan a pipe leading from said pum to the charge forming device, said pump aving a reci rocating piston, an air pump driven by t e internal combustion engine, an air cylinder provided with a piston disposed above the fuel pump and having a connection with the piston thereof and means for delivering air to said air cylinder below said piston for intermittently raising said pump piston to allow said pump piston to drop by gravity for maintaining fuel in the fuel pipe leading to the charge forming device under pressure.

2. The combination with an internal com bustion engine having a charge forming device provided with a bowl having a valve controlled inlet, a main fuel supply tank, of a pum in communication with said fuel tank having a weighted piston, said pump being provided with a valve controlled inlet and a valve controlled outlet, a pipe leading from the outlet of said pump to the inlet of the fuel bowl of said charge forming device, the weight of said piston being adapted to exert pressure on the fluid in the pump cylinder thereof for maintaining the fuel in said pipe leading to the charge forming de vice under pressure and pneumatic means for intermittently raising said pump piston, said pneumatic means being mechanically driven and timed by the engine.

3."The combination with an internal combustion engine having a charge forming device provided with a fuel bowl having an inlet, a float controlled valve controlling said inlet, a main fuel supply tank located in a plane below said charge forming device, of a fuel pump in communication with said fuel tank and the fuel bowl of said charge forming device, said ump having a valve controlled inlet and out et, said pump having a piston adapted to drop by gravity for exerting pressure on the fuel therein for maintaining the fuel in said fuel conduit extending from said pump to said charge forming device under pressure and an air pump mechanically driven by the engine for intermittently raising said piston.

4. The combination with an internal combustion engine having a charge forming device and a main fuel supply located in a plane below the same, of a fuel pump in communication with said fuel tank and said charge forming device, the inlet and outlet of said fuel pump being provided with a check valve, an air cylinder having a piston connected to the piston of said pump and an air pump driven by the engine for delivering air intermittently to said air cylinder beneath said piston for intermittently raising said pump piston and allowing said pump piston to drop by gravity for forcing and maintaining fuel in the fuel line leading to the charge forming device under pressure.

5. The combination with an internal combustion engine having a charge forming device, of a supply tank for supplying fuel to said charge forming device, a fuel pump within said tank, a pipe leading from said fuel pump to said charge forming device, an air chamber having a piston connected to the piston of the fuel pump, an air pump mounted on said internal combustion. engine and driven thereby and a pipe leading from said air pump to said air cylinder for delivering air intermittently to said air cylinder for raising said pump piston and allowingthe same to drop by gravity.

6. The combination with an internal combustion engine having a charge forming device, of a fuel tank, a pump in communication. with said fuel tank, a pipe leading from said pump to said charge forming device, said pump having a weighted piston, an air cylinder disposed above said pump having a piston slidably mounted therein connected to the piston of the fuel pump, said piston being provided with a passage, an air pump mounted in said internal combustion engine having a sliding piston, a cam for moving said piston in one direction, means driven and timed by the engine for operating said cam and an air pipe leading from said pump to said air chamber whereby the pump piston will be intermittently raised and allowed to drop by gravity for forcing fuel from said fuel tank to said charge forming device.

7. The combination with an internal combustion engine having a charge forming device, of a fuel tank, a. fuel pump for forcing fuel from said tank to said charge forming device, an air pump mounted in said engine having an air inlet in communication with the crank case thereof, an engine-driven cam for operating the piston of said air pump and means operated by said air pump for intermittently raising the piston of said fuel pump and allowing the same to drop by gravity for forcing fuel from said tank to said charge forming device.

8. The combination with an internal combustion engine having a charge forming device provided with a fuel bowl and a valve controlled inlet therefor, of a pump having inlet and outlet check valves, a main fuel supply tank, a fuel conduit extending from said tank to the inlet of said pump, a fuel conduit extending from the outlet of said pump to the inlet of the bowl of the charge forming device, said pump having a weighted piston for forcing fuel to said charge forming device and maintaining the same under pressure in the fuel conduit and pneumatic means mechanically driven by the engine for intermittently raising said pump piston and allowing the same to drop by gravity.

In testimony whereof I hereunto afiix my signature.

ALBERT G. REDMOND.

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