Fuel feed and charge forming method and apparatus

Claim 2

Charge forming apparatus for an internal combustion engine including, in combination, a substantially cubically shaped body provided with a mixing passage having an air inlet region and a mixture outlet region, a fuel chamber in the body, a flexible diaphragm forming a wall of the chamber, a fuel inlet in the body, a valve for the fuel inlet, control means for said fuel inlet valve including a lever actuated by movement of said diaphragm under the influence of reduced pressure in the mixing passage, a main orifice opening into the mixing passage, a throttle valve in the mixture outlet region of the mixing passage, an engine idling orifice opening into the mixing passage at the downstream side of the throttle valve, fuel channel means in said body for conveying liquid fuel from the fuel chamber to the orifices, said body having a planar mounting surface for mounting on an engine, a boss extending transversely from each side of the body at the end of the body adjacent the air inlet region, each of the bosses having a bore accommodating a mounting bolt, said bosses being spaced from the planar mounting surface and of a length less than one-third the length of the body whereby to expose portions of the mounting bolts to the atmosphere for cooling the bolts.

Claim 3

Charge forming apparatus for an internal combustion engine including, in combination, a substantially cubically shaped body provided with a mixing passage having an air inlet region and a mixture outlet region, a fuel chamber in the body, a flexible diaphragm forming a wall of the Fuel chamber, a fuel inlet passage in the cubically shaped body, an elongated valve member in said inlet passage longitudinally movable on an axis normal to the plane of the diaphragm, control means for said valve member including a lever actuated by movement of said diaphragm under the influence of reduced pressure in the mixing passage, a main orifice opening into the mixing passage, a throttle valve in the mixing passage, an engine idling orifice opening into the mixing passage at the downstream side of the throttle valve, fuel channel means in said body for conveying liquid fuel from the fuel chamber to the orifices, said body having a planar mounting surface for mounting on an engine, a boss extending transversely from each side of the body at the end of the body adjacent the air inlet region, each of the bosses having a bore accommodating a body mounting bolt, said bosses being spaced from the planar mounting surface to expose portions of the mounting bolts to the atmosphere for cooling the bolts, each side of the body having a recess of semicircular cross section between the adjacent boss and the mounting surface of the body accommodating a mounting bolt.

Claim 4

Charge forming apparatus for an internal combustion engine including, in combination, a substantially cubically shaped body provided with a mixing passage having an air inlet region and a mixture outlet region, a fuel chamber in the body, a flexible diaphragm forming a wall of the Fuel chamber, a fuel inlet passage in the cubically shaped body, an elongated valve member in said inlet passage longitudinally movable on an axis normal to the plane of the diaphragm, control means for said valve member including a lever actuated by movement of said diaphragm under the influence of reduced pressure in the mixing passage, a main orifice opening into the mixing passage, a throttle valve in the mixing passage, an engine idling orifice opening into the mixing passage at the downstream side of the throttle valve, fuel channel means in said body for conveying liquid fuel from the fuel chamber to the orifices, said body having a planar mounting surface for mounting on an engine, a boss extending transversely from each side of the body at the end of the body adjacent the air inlet region, each of the bosses having a bore accommodating a body mounting bolt, said bosses being spaced from the planar mounting surface to expose portions of the mounting bolts to the atmosphere for cooling the bolts, each side of the body having a recess of semicircular cross section between the adjacent boss and the mounting surface of the body accommodating a mounting bolt.

Claim 5

Charge forming apparatus including, in combination, a cubically shaped body provided with a mixing passage having an air inlet region, a fuel and air mixing zone and a mixture outlet region, a fuel chamber in the body, a flexible diaphragm forming a wall of the fuel chamber, a fuel inlet in the body, valve means for the fuel inlet, control means for said valve means including a lever actuated by movement of said diaphragm under the influence of reduced pressure in the mixing passage, a main orifice opening into the mixing passage, a throttle valve in the mixture outlet region of the mixing passage, an engine idling orifice opening into the mixing passage at the downstream side of the throttle valve, fuel channel means in said body for conveying liquid fuel from the fuel chamber to the orifices, said air inlet region being defined by a first curved surface of revolution, the inner circular terminus of said curved surface defining a circular zone of maximum restriction in the mixing passage, a second curved surface of revolution having its small diameter adjacent the circular zone of restriction and defining a wall portion of a fuel and air mixing zone of the mixing passage, the small diameter of the second curved surface being of greater diameter than that of the circular zone of maximum restriction, said second curved surface of revolution being joined with a cylindrical surface of the mixing passage, said main orifice opening into the mixing passage adjacent the circular zone of maximum restriction.

Claim 6

Charge forming apparatus including, in combination, a cubically shaped body provided with a mixing passage having an air inlet region, a fuel and air mixing zone and a mixture outlet region, a fuel chamber in the body, a flexible diaphragm forming a wall of the fuel chamber, a fuel inlet in the body, valve means for the fuel inlet, control means for said valve means including a lever actuated by movement of said diaphragm under the influence of reduced pressure in the mixing passage, a main orifice opening into the mixing passage, a throttle valve in the mixture outlet region of the mixing passage, an engine idling orifice opening into the mixing passage at the downstream side of the throttle valve, fuel channel means in said body for conveying liquid fuel from the fuel chamber to the orifices, said air inlet region being defined by a first curved surface of revolution, the inner circular terminus of said curved surface defining a circular zone of maximum restriction in the mixing passage, a second curved surface of revolution having its small diameter adjacent the circular zone of restriction and defining a wall portion of a fuel and air mixing zone of the mixing passage, the small diameter of the second curved surface being of greater diameter than that of the circular zone of maximum restriction, said second curved surface of revolution being joined with a cylindrical surface of the mixing passage, said main orifice opening into the mixing passage adjacent the circular zone of maximum restriction.

Claim 7

The combination according to claim 3 wherein the circular zone of maximum restriction is of a diameter in a range of five-sixteenths inch and seven-sixteenths inch.

Claim 8

Charge forming apparatus including, in combination, a cubically shaped body provided with a mixing passage having an air inlet region and a mixture outlet region, said body having a planar mounting surface for mounting on an engine, a fuel chamber in the body, a flexible diaphragm forming a wall of the chamber, a fuel inlet in the body, valve means for the fuel inlet, control means for said valve means including a lever actuated by movement of said diaphragm under the influence of reduced pressure in the mixing passage, a main orifice opening into the mixing passage, a throttle valve in the mixture outlet region of the mixing passage, an engine idling orifice opening into the mixing passage at the downstream side of the throttle valve, fuel channel means in said body for conveying liquid fuel from the fuel chamber to the orifices, said air inlet region being defined by a curved surface of revolution, the inner circular terminus of said curved surface defining a circular zone of maximum restriction of the mixing passage, a second curved surface of revolution forming a wall portion of the mixing passage downstream of the air inlet region, the minimum diameter of the second curved surface of revolution being adjacent the inner terminus of the first curved surface, the largest diameter of the second curved surface being joined with a cylindrical surface of the mixing passage, said main orifice opening into the mixing passage at the region of minimum diameter of the second curved surface of revolution, a transversely extending mounting boss on each side of said body adjacent the air inlet region of the mixing passage, the bosses being about one-third the length of the body, each boss having a bore adapted to receive a bolt for mounting the body, each side of the body having a recess of semicircular cross section between the adjacent boss and the mounting surface of the body accommodating a mounting bolt.

Claim 9

Charge forming apparatus including, in combination, a cubically shaped body provided with a mixing passage having an air inlet region and a mixture outlet region, said body having a planar mounting surface for mounting on an engine, a fuel chamber in the body, a flexible diaphragm forming a wall of the chamber, a fuel inlet in the body, valve means for the fuel inlet, control means for said valve means including a lever actuated by movement of said diaphragm under the influence of reduced pressure in the mixing passage, a main orifice opening into the mixing passage, a throttle valve in the mixture outlet region of the mixing passage, an engine idling orifice opening into the mixing passage at the downstream side of the throttle valve, fuel channel means in said body for conveying liquid fuel from the fuel chamber to the orifices, said air inlet region being defined by a curved surface of revolution, the inner circular terminus of said curved surface defining a circular zone of maximum restriction of the mixing passage, a second curved surface of revolution forming a wall portion of the mixing passage downstream of the air inlet region, the minimum diameter of the second curved surface of revolution being adjacent the inner terminus of the first curved surface, the largest diameter of the second curved surface being joined with a cylindrical surface of the mixing passage, said main orifice opening into the mixing passage at the region of minimum diameter of the second curved surface of revolution, a transversely extending mounting boss on each side of said body adjacent the air inlet region of the mixing passage, the bosses being about one-third the length of the body, each boss having a bore adapted to receive a bolt for mounting the body, each side of the body having a recess of semicircular cross section between the adjacent boss and the mounting surface of the body accommodating a mounting bolt.