Patent US1120041A successfully refreshed from Google Patents.
Patent US3669360A successfully refreshed from Google Patents.
US3669360A
Expired / Lapsed
US
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Fuel injection nozzles
Assignee: CAV Ltd
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Filing: 1970-07-07
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Granted: 1972-06-13
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Expires: 1990-07-07
Abstract
Abstract A fuel injection nozzle comprising a supply orifice through which fuel flows to a combustion space of an associated engine a resiliently loaded valve member which co-operates with a seating to prevent the flow of fuel through the supply orifice until the pressure of fuel applied to the valve member from an inlet attains a sufficiently high value, the mechanical connection between the valve member and the resilient means which loads the valve member being divided to define a variable volume chamber. Fuel is supplied to the chamber from the inlet and means is provided to limit the maximum volume of the chamber the arrangement being that fuel flowing through the inlet initially flows at a restricted rate through the supply orifice and when said chamber has attained its maximum volume the valve member is lifted to allow substantially unrestricted flow through the supply orifice.
Inventors
- 👤 Basil Edward Knight
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:42
CPC Classifications
F; F02; F02M; F02M45/00; F02M45/12
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
302 words
A fuel injection nozzle of the kind comprising a nozzle head, a supply orifice formed in the nozzle head and through which fuel flows to a combustion space of an internal combustion engine, a bore formed in the head, said bore at one end thereof communicating with said orifice, a seating defined at said end of the bore, a valve member slidable within said bore and shaped for co-operation with said seating to prevenT fuel flow through said orifice, resilient means for urging the valve member into contact with the seating, a a fuel inlet, passage means through which fuel under pressure from the inlet can be applied to said valve member to lift the valve member from the seating against the action of the resilient means to permit fuel flow through the orifice, means disposed intermediate the valve member and the resilient means, said means defining a variable volume chamber to which fuel is supplied from said inlet, means for limiting the maximum volume of the chamber, a restricted orifice through which fuel flows to said chamber from the inlet, the arrangement being such that fuel flowing through the inlet into the chamber flows at a restricted rate through the restricted orifice so that the pressure within the chamber is lower than that applied to the valve member, said fuel acting to increase the volume of the chamber by movement of the means disposed between the valve member and the resilient means against the action of the resilient means, said valve member because of the differing pressures applied thereto lifting slightly from the seating to allow restricted flow of fuel through said supply orifice, and when said chamber has attained its maximum volume the valve member being lifted completely from the seating to allow substantially unrestricted flow through the supply orifice.
Claim 2
Dependent Claim
302 words
A fuel injection nozzle of the kind comprising a nozzle head, a supply orifice formed in the nozzle head and through which fuel flows to a combustion space of an internal combustion engine, a bore formed in the head, said bore at one end thereof communicating with said orifice, a seating defined at said end of the bore, a valve member slidable within said bore and shaped for co-operation with said seating to prevenT fuel flow through said orifice, resilient means for urging the valve member into contact with the seating, a a fuel inlet, passage means through which fuel under pressure from the inlet can be applied to said valve member to lift the valve member from the seating against the action of the resilient means to permit fuel flow through the orifice, means disposed intermediate the valve member and the resilient means, said means defining a variable volume chamber to which fuel is supplied from said inlet, means for limiting the maximum volume of the chamber, a restricted orifice through which fuel flows to said chamber from the inlet, the arrangement being such that fuel flowing through the inlet into the chamber flows at a restricted rate through the restricted orifice so that the pressure within the chamber is lower than that applied to the valve member, said fuel acting to increase the volume of the chamber by movement of the means disposed between the valve member and the resilient means against the action of the resilient means, said valve member because of the differing pressures applied thereto lifting slightly from the seating to allow restricted flow of fuel through said supply orifice, and when said chamber has attained its maximum volume the valve member being lifted completely from the seating to allow substantially unrestricted flow through the supply orifice.
Claim 3
Dependent Claim
35 words
A fuel injection nozzle as claimed in claim 1 in which the means for limiting the maximum volume of the chamber comprises a valve operable to cut off the supply of fuel to the chamber.
Claim 4
Dependent Claim
91 words
A fuel injection nozzle as claimed in claim 2 including a groove formed on the means disposed between the valve member and resilient means, said groove communicating with said chamber, and a port formed in the wall of the cylinder in which the piston member is located, said port communicating with said inlet by way of the restricted orifice, the arrangement being that when the piston member has moved a predetermined distance the groove will move out of register with the port and the volume of the chamber will be limited.
Claim 5
Dependent Claim
44 words
A fuel injection nozzle as claimed in claim 3 including a non return valve through which said groove communicates with the inlet, said non return valve opening when the supply of fuel through the inlet ceases, to permit fuel to escape from said chamber.
Claim 6
Dependent Claim
34 words
A fuel injection nozzle as claimed in claim 4 in which the degree of restriction offered by said restricted orifice is made to increase as the speed of operation of the associated engine increases.
Claim 7
Dependent Claim
139 words
A fuel injection nozzle as claimed in claim 2 in which said means disposed between the valve member and resilient means comprises a piston member and a distance piece disposed between the piston member and valve member, the chamber being defined between the piston member and distance piece and a port formed in the wall of the bore in which the piston member is located, said port being opened to the chamber when the piston member has moved a predetermined amount, and the port communicating with one end of a cylinder containing a spring loaded valve element, the port when opened allowing fuel under pressure to be applied to said valve element to move it against the action of its spring, the valve element when so moved, cutting off the supply of fuel from the inlet to the chamber.
Claim 8
Dependent Claim
40 words
A fuel injection nozzle as claimed in claim 6 in which the valve element is provided with a restricted opening and through which fuel can flow to a drain from said chamber when the supply of fuel under pressure ceases.
Claim 9
Dependent Claim
206 words
A fuel injection nozzle of the kind comprising a nozzle head, a supply orifice formed in the nozzle head and through which fuel flows to a combustion space of an internal combustion engine, a bore formed in the head, said bore at one end thereof communicating with said orifice, a seating defined at said end of the bore, a valve member slidable within said bore and shaped for co-operation with said seating to prevent fuel flow throuGh said orifice, resilient means for urging the valve member into contact with the seating, a fuel inlet, passage means through which fuel under pressure from the inlet can be applied to said valve member to lift the valve member from the seating against the action of the resilient means to permit fuel flow through the orifice, a pair of cylindrical members, disposed intermediate the valve member and the resilient means, a chamber being defined between the cylindrical members, and the chamber being in constant communication with the inlet, a restricted orifice through which fuel flows to said supply orifice at a restricted rate, and a by-pass passage through which fuel can flow to said supply orifice at a substantially unrestricted rate when the chamber has attained its maximum volume.
Claim 10
Dependent Claim
206 words
A fuel injection nozzle of the kind comprising a nozzle head, a supply orifice formed in the nozzle head and through which fuel flows to a combustion space of an internal combustion engine, a bore formed in the head, said bore at one end thereof communicating with said orifice, a seating defined at said end of the bore, a valve member slidable within said bore and shaped for co-operation with said seating to prevent fuel flow throuGh said orifice, resilient means for urging the valve member into contact with the seating, a fuel inlet, passage means through which fuel under pressure from the inlet can be applied to said valve member to lift the valve member from the seating against the action of the resilient means to permit fuel flow through the orifice, a pair of cylindrical members, disposed intermediate the valve member and the resilient means, a chamber being defined between the cylindrical members, and the chamber being in constant communication with the inlet, a restricted orifice through which fuel flows to said supply orifice at a restricted rate, and a by-pass passage through which fuel can flow to said supply orifice at a substantially unrestricted rate when the chamber has attained its maximum volume.
Claim 11
Dependent Claim
34 words
A fuel injection nozzle as claimed in claim 8 including a stop to limit the extent of movement of the one cylindrical member adjacent the resilient means against the action of the resilient means.
Claim 12
Dependent Claim
41 words
A fuel injection nozzle as claimed in claim 9 in which said by-pass passage is controlled by said one cylindrical member, said member having a groove formed thereon and which registers with a pair of ports to complete said by-pass passage.
Claim 13
Dependent Claim
65 words
A fuel injection nozzle as claimed in claim 10 including a non return valve disposed intermediate the chamber and the inlet, said non return valve being disposed to close to prevent fuel flowing from the chamber when the supply of fuel ceases, a restricted passage being provided to by-pass the non return valve to allow fuel to flow from the chamber at a restricted rate.
Claim 14
Dependent Claim
33 words
A fuel injection nozzle as claimed in claim 11 in which the degree of restriction offered by the restricted orifice is variable in accordance with the volume of fuel stored in the chamber.
Claim 15
Dependent Claim
31 words
A fuel injection nozzle as claimed in claim 11 in which the degree of restriction offered by the restricted orifice is variable in accordance with the pressure drop across the orifice.
Claim 16
Dependent Claim
25 words
A fuel injection nozzle as claimed in claim 12 in which the groove on said one cylindrical member is profiled to constitute a variable throttle.
Claim 17
Dependent Claim
19 words
A fuel injection nozzle as claimed in claim 14 including a restrictor disposed between the chamber and the inlet.
References Cited (Backward Citations)
US3409226A
Cited
US3464627A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |