Apparatus for fuel supply to spark ignition type internal combustion engine
First Claim
1. A pressure adjusting device for a fuel supply apparatus for a spark ignition type of internal combustion engine, said apparatus comprising:
- a cylinder, a piston slidable in said cylinder, said cylinder having an inlet opening into the inner end thereof for admitting liquid fuel from the discharge side of a fuel pump, said piston and cylinder having a small gap therebetween extending along a portion of the length thereof with the length of the gap being varied during motion of the piston in and out of the cylinder, said cylinder having an outlet therefrom at the end of the gap remote from the inlet for discharging liquid fuel passing through said gap to the intake side of a fuel pump, a bellows at the opposite end of said piston from said gap and having a bellows plate attached to the said opposite end of said piston, the space outside of said bellows being open to the atmosphere, and means connected to said bellows for communicating the interior of the bellows with the static pressure of a Venturi throat in the air intake of the fuel supply apparatus.
0 Assignments
0 Petitions
Accused Products
Abstract
In a fuel supply apparatus and method for a spark ignition type of internal combustion engine, a variable throttle is provided in a bypass between the discharge side and the suction side of a volume type fuel pump. The variable throttle is regulated by a pressure adjusting device which makes the ratio of the differential pressure between atmospheric pressure and the negative static pressure in the air intake of the engine and the pressure on the discharge side of the fuel pump equal to n. The value of n is set so that the flow of the fluid in a jet nozzle connected to the discharge side of the fuel pump will be turbulent. The spray from the jet nozzle is blended with the air sucked into the engine and the mixture is supplied to the engine intake manifold through a volume control device.
29 Citations
12 Claims
-
1. A pressure adjusting device for a fuel supply apparatus for a spark ignition type of internal combustion engine, said apparatus comprising:
- a cylinder, a piston slidable in said cylinder, said cylinder having an inlet opening into the inner end thereof for admitting liquid fuel from the discharge side of a fuel pump, said piston and cylinder having a small gap therebetween extending along a portion of the length thereof with the length of the gap being varied during motion of the piston in and out of the cylinder, said cylinder having an outlet therefrom at the end of the gap remote from the inlet for discharging liquid fuel passing through said gap to the intake side of a fuel pump, a bellows at the opposite end of said piston from said gap and having a bellows plate attached to the said opposite end of said piston, the space outside of said bellows being open to the atmosphere, and means connected to said bellows for communicating the interior of the bellows with the static pressure of a Venturi throat in the air intake of the fuel supply apparatus.
- View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12)
-
2. In combination, a vehicle having a spark ignition type internal combustion engine thereon, a fuel supply apparatus for said engine, and a pressure adjusting device for said fuel supply apparatus, said pressure adjusting device having a cylinder, a piston slidable in said cylinder, said cylinder having an inlet opening into the inner end thereof for admitting liquid fuel from the discharge side of a fuel pump, said piston and cylinder having a small gap therebetween extending along a portion of the length thereof with the length of the gap being varied during motion of the piston in and out of the cylinder, the cylinder having an outlet therefrom at the end of the gap remote from the inlet for discharging liquid fuel passing through said gap to the intake side of a fuel pump, a bellows at the opposite end of said piston from said gap and having a bellows plate attached to the said opposite end of said piston, the space outside of said bellows being open to the atmosphere, and means connected to said bellows for communicating the interior of the bellows with the static pressure of a Venturi throat in the air intake of the fuel supply apparatus, said pressure adjusting device being positioned in said vehicle with said piston parallel to the direction of travel of said vehicle and with the bellows facing forward in the vehicle.
-
3. In combination:
- a pressure adjusting device for a fuel supply apparatus for a spark ignition type of internal combustion engine, said device comprising a cylinder, a piston slidable in said cylinder, said cylinder having an inlet opening into the inner end thereof for admitting liquid fuel from the discharge side of a fuel pump, said piston and cylinder having a small gap therebetween extending along a portion of the length thereof with the length of the gap being varied during motion of the piston in and out of the cylinder, the cylinder having an outlet therefrom at the end of the gap remote from the inlet for discharging liquid fuel passing through said gap to the intake side of a fuel pump, a bellows at the opposite end of said piston from said gap and having a bellows plate attached to the said opposite end of said piston, and means connected to said bellows for communicating the interior of the bellows with the static pressure of a Venturi in the air intake of the fuel supply apparatus; and
an acceleration mechanism connected to said bellows for supplying air under pressure to the outside of said bellows.
- a pressure adjusting device for a fuel supply apparatus for a spark ignition type of internal combustion engine, said device comprising a cylinder, a piston slidable in said cylinder, said cylinder having an inlet opening into the inner end thereof for admitting liquid fuel from the discharge side of a fuel pump, said piston and cylinder having a small gap therebetween extending along a portion of the length thereof with the length of the gap being varied during motion of the piston in and out of the cylinder, the cylinder having an outlet therefrom at the end of the gap remote from the inlet for discharging liquid fuel passing through said gap to the intake side of a fuel pump, a bellows at the opposite end of said piston from said gap and having a bellows plate attached to the said opposite end of said piston, and means connected to said bellows for communicating the interior of the bellows with the static pressure of a Venturi in the air intake of the fuel supply apparatus; and
-
4. A fuel supply apparatus for supplying fuel to a spark ignition type internal combustion engine, said apparatus comprising:
- a fuel and air mixing chamber;
an air intake conduit having a Venturi throat opening into said mixing chamber;
an air flow measuring means for detecting a negative pressure in said Venturi throat of said air intake conduit as an indication of volume of air flow therethrough;
a volume type liquid fuel pump;
a fuel jet nozzle connected to the discharge side of said fuel pump and directed into said mixing chamber;
a bypass connected between the discharge side and the intake side of said fuel pump;
a variable throttle in said bypass;
pressure adjusting means, connected to said variable throttle and responsive to atmospheric pressure, to the negative pressure at the air flow measuring means and to the pressure on the discharge side of said fuel pump, for regulating said variable throttle such that the ratio of the differential pressure between said negative pressure and atmospheric pressure and the pump discharge pressure is equal to n, the value of n being sufficient for causing the fuel flow in the jet nozzle to be turbulent;
a volume control mechanism connected to the mixing chamber for controlling the outflow of the mixture of air and fuel to the engine intake manifold, said mixing chamber including an upper wall and an annular outer wall and a lower wall defining said mixing chamber, said jet nozzle being in said upper wall on the central axis of said annular wall, said lower wall having an outlet port to said volume control mechanism, and said annular wall having air inlet ports around the upper and lower edges thereof.
- a fuel and air mixing chamber;
Specification