US3288080A

US3288080A - Fuel pumps

Info

Publication number: US3288080A
Application number: US404402A
Authority: US
Inventors: Edward A Madej
Original assignee: Individual
Current assignee: Individual
Priority date: 1964-10-16
Filing date: 1964-10-16
Publication date: 1966-11-29
Anticipated expiration: 1983-11-29

Description

FUEL PUMPS Filed Oct. 16, 1964 Fig.l.

INVENTOR Edward A. Mudej United States Patent" "cc 3,288,080 I FUEL PUMPS. Edward A. Madej, 1209 Riverview Drive, Verona, Pa. Filed Oct. 16, 1964, Ser. No. 404,402 4 Claims. (Cl. 103-153) This invention relates to fuel pumps and particularly to fuel pumps made of plastic for moving liquid fuel from a storage tank to a place of use as in an automobile. Fuel pumps for moving fuel have long been used in the automotive industry for pumping gas from the tank to the carburetor. Such fuel pumps have in the past involved intricate cast parts, diaphragms and actuator levers. The diaphragms, particularly of such pumps, have been subject to relatively rapid deterioration in the presence of hydrocarbon fuels such as gasoline and have required repeated replacement.

By the present invention, I eliminate the need for diaphragms and expensive cast metal housings. In a preferred embodiment of my invention, I provide a cylinder, a piston movable in said cylinder, a first end member in said cylinder, a cylindrical cap means on the cylinder adjacent the first end member, an internal wall within the cap means engaging the end member and forming a pair of chambers within the cap, a pair of one way valves in said first end member, one on each side of the internal wall communicating between the cylinder and the chambers, ports in the cap means communicating between the exterior of the cap and each of the chambers within, a second end member on said cylinder opposite the first end member, actuator means on the piston adapted to be driven by an external power source and resilient means urging the piston toward one end of the cylinder. Preferably the resilient means is a spring urging the piston away from the first end member.

In the foregoing general description, I have set out certain objects, purposes and advantages of my invention. Other objects, purposes and advantages will be apparent from a consideration of the following description and the accompanying drawings in which,

FIGURE 1 is an isometric view partly exploded of a fuel pump according to my invention;

FIGURE 2 is a section through the pump of FIG- URE 1;

FIGURE 3 is an isometric view partly exploded of a second embodiment of a fuel pump according to my invention; and

FIGURE 4 is a section through the pump of FIG- URE 3.

Referring to the drawings, I have illustrated a fuel pump of plastic having a cylinder 10 carrying a piston 11 movable axially therein. A first end member 12 is formed in one end of cylinder 10 and is provided with

openings

13 and 14 on opposite sides of a diametrically extending U-flange 15 on end member 12. Each of the

openings

13 and 14 is provided with a moving cap 16 and 17 respectively moving to close the opening with which it is associated when pressure is applied to the cap. An end cap member 18 having an inner dividing wall 19 is fixed to the end of the cylinder 10 adjacent the end member 12 with the dividing wall 19 engaged within the U-flange 15 and a radial flange 20 on the cap member engaged within an annular groove 20a on the end of cylinder 10. The wall 19 divides the area within the end cap into two

separate chambers

21 and 22 which open to the exterior of the cap through ports 23 and 24. Resilient means in the form of a spring 25 is provided within housing 26 formed integrally with cylinder 10 and alongside thereof. The spring 25 bears on one end 27a of a rocker arm 27 pivoted on shaft 28 carried between housing 26 and cylinder 10. The opposite 3,288,080 Patented Nov. 29, 1966 end 27b of rocker arm 27 rests between

flanges

29 and 30 on guide arm 31 on piston 11, The guide arm 31 moves in opening 32 in the second end member 33 closing cylinder 10. An actuator rod 34. bearing on a cam surface 35 on a vehicle cam shaft bears against'end 27a of rocker arm 27 and urges it against the spring 25.

The fuel pump of my invention operates in the following manner. When the cam surface 35 rotates the rod 34 moves toward and away from spring 25. This causes rocker arm 27 to pivot on shaft 28 and the end 27b of rocker arm 27 to move piston 11 in cylinder 10. When the piston 11 moves away from end member 12 the valve cap 16 moves away from opening 13 and'fuel is drawn from a tank (not shown) through lines (not shown') to port 23 into chamber 21, through-opening 13 into'cylinder 10. When the piston moves toward end member 12 the cap 16 closes opening 13 and forces cap 17 away from opening 14 permitting fuel to flow through open. ing 14 into chamber 22, through port 24, through lines (not shown) to a carburetor (not shown).

In the embodiment shown in FIGURES 3 and 4 I have illustrated an embodiment in which a cylinder 50 is provided with an end member 51 carrying a U-shaped diametrically positioned flange 52. A cap member 54 with an inner diametrically disposed wall 55 is connected to cylinder 50 in the same manner as cylinder 10 engages cap member 18 of FIGURES l and 2 forming chambers 56 and 57.

Openings

58 and 59 with moving caps 60 and 61 connect the interior of cylinder 50 with chambers 56 and 57 in like manner as

openings

13 and 14 of FIGURES 1 and 2. A piston 62 is movable axially in cylinder 50 on actuator rod 63 which passes through an opening 64a in second end member 64. The actuator rod 63 bears against a cam 65 on cam shaft of an engine on which the pump is placed. A spring 66 between first end member 51 and piston 62 urges piston 62 away from end member 51.

The operation of the pump of FIGURES 3 and 4 is as follows. The rod 63 is urged toward cam 65 by spring 66 to draw fuel through ports 67 into chamber 56, through opening 58 into cylinder 50. When cam 65 rotates the piston 62 moves against spring 66 to force fuel out through opening 59 into chamber 57-and through port 68 to a carburetor (not shown).

A by-pass pressure relief valve 69 may be inserted in the dividing wall 55 to by-pass fluid from the pressure chamber to the intake chamber of the pump.

From the foregoing description it will be seen that the fuel pump of my invention is extremely simple, free of diaphragms and other parts subject to deterioration in the presence of fuel and readily formed of any thermoplastic or thermosetting plastic.

While I have illustrated certain presently preferred embodiments of my invention, it will be understood that this invention may be otherwise embodied within the scope of the following claims.

I claim:

1. In a plastic fuel pump for handling hydrocarbon fuels a cylinder, a piston movable in said cylinder, a first end member in said cylinder, a cap means on the cylinder adjacent the first end member, an internal wall within the cap means engaging the first end member and forming therewith a pair of chambers within the cap member, a pair of one way valves in said first end member actuated only by pressure differential on opposite sides of said first end member, one on each side of said internal wall communicating between the cylinder and the chambers, keeper means on said first end member holding said valves for free movement transverse to the plane of the first end member, ports in the cap means communicating between the exterior and each of the chambers, a second end member on the cylinder spaced from the first end member, actuator means engaging the piston alternately to move the piston in the cylinder toward the first end member and then release said piston for movement away from said first end member and resilient means urging the piston away from the first end member. I p j 2. In a plastic fuel pump for handling hydrocarbon fuels a cylinder, a piston movable in said cylinder, 2. first end member in one end of said cylinder, a cap means on the cylinder adjacent the first end member, -an internal wall within the cap means engaging the first end mem ber and forming therewith a pair of chambers within the cap member, a pair of one way valves in said first end member actuated only by pressure difierential on opposite sides of said first end member, one on each side of said internal wall communicating between the cylinder and the chambers, keeper means on said first end member holding said valves for free movement transverse to the plane of the first end member, ports in the cap means communicating between the exterior of the cap and each of the chambers, a second end member on the cylinder spaced from the first end member on the opposite side of the piston, actuator means on the piston extending through an opening in said second end member alternately to move the piston in the cylinder toward the first end member and then release said piston for movement away from said first end member and resilient means urging the piston away from the first end member.

3. In a plastic fuel pump for handling hydrocarbon fuels a cylinder, a piston movable in said cylinder, a. first end member inone end of said cylinder, a cap means on the cylinder adjacent the first end member, an internal wall within the cap means engaging the first end member and forming therewith a pair of chambers within the cap member, a pair of one way valves in said first end -member actuated only by pressure dilferential on opposite sides of said first end member, one on each side of:

said internal wall communicating between the cylinder and the chambers, keeper means on said first end member holding said valves for free movement transverse to the plane of the first end member, ports in the cap means communicating between the exterior and each of the chambers,,a second end member on the cylinder spaced,

from the first end member on the opposite side of the piston from the first end member, guide means on thev piston adapted to move in an opening in said second end member, actuator means engaging the piston for moving the piston axially within the cylinder and resilient means acting on the actuator means urging the piston toward one end of the cylinder.

4. A fuel pump as, claimed in claim 3 wherein the actuator means is a link pivoted adjacent the cylinder having one end acting on the piston and the opposite end urged in one direction by said resilient means and adrive rod acting on said opposite end against the urging of the resilient means, said drive rod being adapted to be operated by a source of external power.

References Citedby the Examiner UNITED STATES PATENTS 777,828 12/1904 Willmann 103-153 FOREIGN PATENTS 846,640 8/1952 Germany.

MARK NEWMAN, Primary Examiner.

' HENRY F. RADUAZO, Examiner.

Claims

1. IN A PLASTIC FUEL PUMP FOR HANDLING HYDROCARBON FUELS A CYLINDER, A PISTON MOVABLE IN SAID CYLINDER, A FIRST END MEMBER IN SAID CYLINDER, A CAP MEANS ON THE CYLINDER ADJACENT THE FIRST END MEMBER, AN INTERNAL WALL WITHIN THE CAP MEANS ENGAGING THE FIRST END MEMBER AND FORMING THEREWITH A PAIR OF CHAMBERS WITHIN THE CAP MEMBER, A PAIR OF ONE WAY VALVES IN SAID FIRST END MEMBER ACTUATED ONLY BY PRESSURE DIFFERENTIAL ON OPPOSITE SIDES OF SAID FIRST END MEMBER, ONE ON EACH SIDE OF SAID INTERNAL WALL COMMUNICATING BETWEEN THE CYLINDER AND THE CHAMBERS, KEEPER MEANS ON SAID FIRST END MEMBER HOLDING SAID VALVES FOR FREE MOVEMENT TRANSVERSE TO THE PLANE OF THE FIRST END MEMBER, PORTS IN THE CAP MEANS COMMUNICATING BETWEEN THE EXTERIOR AND EACH OF THE CHAMBERS, A SECOND END MEMBER ON THE CYLINDER SPACED FROM THE FIRST END MEMBER, ACTUATOR MEANS ENGAGING THE PISTON ALTERNATELY TO MOVE THE PISTON IN THE CYLINDER TOWARD THE FIRST END MEMBER AND THEN RELEASE SAID PISTON FOR MOVEMENT AWAY FROM SAID FIRST END MEMBER AND RESILIENT MEANS URGING THE PISTON AWAY FROM THE FIRST END MEMBER.