Fuel injector

Claim 2

An injector for delivering fuel directly to an engine combustion chamber, said injector including a housing, a piston in said housing, a sleeve closing one end of said housing and surrounding one end of said piston and thereby defining a control chamber between said sleeve and said housing and a delivery chamber between said sleeve and said piston, said sleeve having an end adapted for exposure to the pressure in said combustion chamber and being adapted to slide relative to said piston and said housing and thereby increase the pressures in said control and delivery chambers upon an increase in pressure in said combustion chamber, said housing having a supply passage connected to said control and delivery chambers for supplying fuel thereto, a magnetically responsive control valve disposed in said supply passage, said valve being responsive to the difference between the control chamber pressure and the supply passage pressure for obstructing flow from said control chamber to said passage upon an increase in the control chamber pressure, said sleeve having a delivery passage extending from said delivery chamber and adapted to open to said combustion chamber, an injection valve disposed in said delivery passage for inhibiting flow therethrough, said injection valve being responsive to the delivery chamber pressure for permitting delivery of fuel through said delivery passage to said combustion chamber upon an increase in the delivery chamber pressure, and a coil adjacent said control valve and energizable for creating a magnetic field to displace said control valve to permit flow from said control chamber to said supply passage, whereby the control chamber pressure may be reduced and the combustion chamber pressure may cause said sleeve to slide and thereby deliver fuel from said delivery chamber through said delivery passage to said combustion chamber while said coil is energized, and wherein said control valve is responsive to the difference between the supply passage pressure and the control chamber pressure for permitting flow from said supply passage to said control and delivery chambers upon a decrease in the control chamber pressure, whereby said control valve may be displaced to fill said control and delivery chambers with fuel without energizing said coil.

Claim 3

An injector for delivering fuel directly to an engine combustion chamber, said injector including a housing, a piston in said housing, a sleeve closing one end of said housing and surrounding one end of said piston and thereby defining a control chamber between said sleeve and said housing and a delivery chamber between said sleeve and said piston, said sleeve having an end adapted for exposure to the pressure in said combustion chamber and being adapted to slide relative to said piston and said housing and thereby increase the pressures in said control and delivery chambers upon an increase in pressure in said combustion chamber, said housing having a supply passage connected to said control and delivery chambers for supplying fuel thereto, a valve seat member disposed in said supply passage, a magnetically responsive control valve biased to engage said valve seat member and obstruct flow from said control chamber to said passage upon an increase in the control chamber pressure, said sleeve having a delivery passage extending from said delivery chamber and adapted to open to said combustion chamber, an injection valve disposed in said delivery passage for inhibiting flow therethrough, said injection valve being responsive to the delivery chamber pressure for permmitting delivey of fuel through said delivery passage to said combustion chamber upon an increase in the delivery chamber pressure, and a coil adjacent said control valve and energizable for creating a magnetic field to displace said control valve from said valve seat member against a stop and permit flow from said control chamber to said supply passage, whereby the control chamber pressure may be reduced and the combustion chamber pressure may cause said sleeve to slide and thereby delivery fuel from said delivery chamber through said delivery passage to said combustion chamber while said coil is energized, and wherein said valve seat member is adjustable relative to said stop to establish the rate of fuel delivery through said delivery passage.

Claim 4

An injector for delivering fuel directly to an engine combustion chamber, said injector including a housing, a piston in said housing, a sleeve closing one end of said housing and surrounding one end of said piston and thereby defining a control chamber between said sleeve and said housing and a delivery chamber between said sleeve and said piston, said sleeve having an end adapted for exposure to the pressure in said combustion chamber and being adapted to slide relative to said piston and said housing and thereby increase the pressures in said control and delivery chambers upon an increase in pressure in said combustion chamber, said housing having a supply passage connected to said control and delivery chambers for supplying fuel thereto, a valve seat member disposed in said supply passage, a magnetically responsive control valve biased to engage said valve seat member and obstruct flow from said control chamber to said passage upon an increase in the control chamber pressure, said sleeve having a delivery passage extending from said delivery chamber and adapted to open to said combustion chamber, an injection valve disposed in said delivery passage for inhibiting flow therethrough, said injection valve being responsive to the delivery chamber pressure for permmitting delivey of fuel through said delivery passage to said combustion chamber upon an increase in the delivery chamber pressure, and a coil adjacent said control valve and energizable for creating a magnetic field to displace said control valve from said valve seat member against a stop and permit flow from said control chamber to said supply passage, whereby the control chamber pressure may be reduced and the combustion chamber pressure may cause said sleeve to slide and thereby delivery fuel from said delivery chamber through said delivery passage to said combustion chamber while said coil is energized, and wherein said valve seat member is adjustable relative to said stop to establish the rate of fuel delivery through said delivery passage.

Claim 5

An injector for delivering fuel directly to an engine combustion chamber, said injector including a housing, a piston in said housing, a sleeve closing one end of said housing and surrounding one end of said piston and thereby defining a control chamber between said sleeve and said housing and a delivery chamber between said sleeve and said piston, said sleeve having an end adapted for exposure to the pressure in said combustion chamber and being adapted to slide relative to said piston and said housing and thereby increase the pressures in said control and delivery chambers upon an increase in pressure in said combustion chamber, said housing having a supply passage connected to said control and delivery chambers for supplying fuel thereto, a valve seat member disposed in said supply passage, a magnetically responsive control valve responsive to the difference between the control chamber pressure and the supply pressure for engaging said valve seat member and obstructing flow from said control chamber to said passage upon an increase in the control chamber pressure, said sleeve having a delivery passage extending from said delivery chamber and adapted to open to said combustion chamber, an injection valve disposed in said delivery passage for inhibiting flow therethrough, said injection valve being responsive to the delivery chamber pressure for permitting delivery of fuel through said delivery passage to said combustion chamber upon an increase in the delivery chamber pressure, and a coil adjacent said control valve and energizable for creating a magnetic field to displace said control valve from said valve seat member against a stop and permit flow from sad control chamber to said supply passage, whereby the control chamber pressure may be reduced and the combustion chamber pressure may cause said sleeve to slide and thereby deliver fuel from said delivery chamber through said delivery passage to said combustion chamber while said coil is energized, wherein said valve seat member is adjustable relative to said stop to establish the rate of fuel delivery through said delivery passage, and wherein said control valve is responsive to the difference between the supply passage pressure and the control chamber pressure for permitting flow from said supply passage to said control and delivery chambers upon a decrease in the control chamber pressure, whereby said control valve may be displaced to fill said control and delivery chambers with fuel without energizing said coil.

Claim 6

An injector for delivering fuel directly to an engine combustion chamber, said injector including a housing, a piston in said housing, a sleeve closing one end of said housing and surrounding one end of said piston and thereby defining a control chamber between said sleeve and said housing and a delivery chamber between said sleeve and said piston, said sleeve having an end adapted for exposure to the pressure in said combustion chamber and being adapted to slide relative to said piston and said housing and thereby increase the pressures in said control and delivery chambers upon an increase in pressure in said combustion chamber, said housing having a supply passage connected to said control and delivery chambers for supplying fuel thereto, a valve seat member disposed in said supply passage, a magnetically responsive control valve responsive to the difference between the control chamber pressure and the supply pressure for engaging said valve seat member and obstructing flow from said control chamber to said passage upon an increase in the control chamber pressure, said sleeve having a delivery passage extending from said delivery chamber and adapted to open to said combustion chamber, an injection valve disposed in said delivery passage for inhibiting flow therethrough, said injection valve being responsive to the delivery chamber pressure for permitting delivery of fuel through said delivery passage to said combustion chamber upon an increase in the delivery chamber pressure, and a coil adjacent said control valve and energizable for creating a magnetic field to displace said control valve from said valve seat member against a stop and permit flow from sad control chamber to said supply passage, whereby the control chamber pressure may be reduced and the combustion chamber pressure may cause said sleeve to slide and thereby deliver fuel from said delivery chamber through said delivery passage to said combustion chamber while said coil is energized, wherein said valve seat member is adjustable relative to said stop to establish the rate of fuel delivery through said delivery passage, and wherein said control valve is responsive to the difference between the supply passage pressure and the control chamber pressure for permitting flow from said supply passage to said control and delivery chambers upon a decrease in the control chamber pressure, whereby said control valve may be displaced to fill said control and delivery chambers with fuel without energizing said coil.