Patent US5211340A successfully refreshed from Google Patents.
US5211340A
Expired / Lapsed
US
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Fuel injector
Assignee: Bosch Corp
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Filing: 1992-08-06
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Granted: 1993-05-18
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Expires: 2012-08-06
Abstract
Abstract In a fuel injector, a plurality of pairs of first and second injection ports are formed in a distal end portion of a nozzle body, and are spaced from one another peripherally of the nozzle body. The angles of the first and second injection ports relative to an axis of the nozzle body is different from each other. The inner ends of the first injection ports are disposed at a valve seat, and the inner ends of the second injection ports are spaced from the inner ends of the first injection ports toward the distal end of the nozzle body in the axial direction of the nozzle body. Each pair of first and second injection ports have a substantially common outer end. At an initial stage of the lift of the needle valve, the injection of fuel from the first injection ports is effected preferentially due to a throttle effect between the abutment portion and the valve seat. When the amount of lift of the needle valve exceeds a specified lift amount, the injection of fuel from the second injection ports is effected preferentially. The speed of lift of the needle valve is limited by a lift speed limiting mechanism until the amount of lift of the needle valve reaches the specified lift amount, thereby prolonging the time period of the fuel injection from the first injection ports.
Inventors
- 👤 Fumitsugu Yoshizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:39
CPC Classifications
F; F02; F02M; F02M61/00; F02M61/16; F02M61/18; F02M61/1806; F02M61/1813; F02M45/00; F02M45/02; F02M45/04; F02M45/08; F02M45/083; F02M45/086; F02M45/12; F02M61/04; F02M61/10; F02M61/12; F02M61/20; F02M61/205
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
424 words
A fuel injector comprising: (a) a hollow elongate nozzle body having a closed distal end portion, said nozzle body having a guide hole, a fuel reservoir chamber provided forwardly of said guide hole, a tapered valve seat formed on an inner surface of the distal end portion of said nozzle body, and a plurality of pairs of first and second injection ports formed in the distal end portion of said nozzle body and spaced from one another in a direction of the periphery of said nozzle body, the angle of said first injection port relative to an axis of said nozzle body being different from the angle of said second injection port relative to the axis of said nozzle body, inner ends of said first injection ports being disposed at said valve seat, inner ends of said second injection ports being spaced from the inner ends of said first injection ports toward the distal end of said nozzle body in the direction of the axis of said nozzle body, and each pair of said first and second injection ports having a common outer end; (b) a needle valve received in said nozzle body, said needle valve having a slide portion slidably received in said guide hole, a pressure receiving portion received in said fuel reservoir chamber, and a tapered conical abutment portion formed at a distal end portion of said needle valve, and the inner ends of said first injection ports facing and sealed by an outer peripheral surface of said abutment portion of said needle valve when said abutment portion is seated on said valve seat; (c) urging means for urging said needle valve toward said valve seat, said needle valve lifting against the bias of said urging means when a fuel pressure received by said pressure receiving portion of said needle valve exceeds a predetermined pressure, so that said abutment portion is brought out of contact with said valve seat, the injection of fuel from said first injection ports being effected due to a throttle effect between said abutment portion and said valve seat until the amount of lift of said needle valve reaches a specified lift amount, and when the amount of lift of said needle valve exceeds said specified lift amount, said throttling effect being eliminated, so that the injection of the fuel from said second injection ports is effected; and (d) lift speed limiting means for lowering the speed of lift of said needle valve until the amount of lift of said needle valve reaches said specified lift amount.
Claim 2
Dependent Claim
424 words
A fuel injector comprising: (a) a hollow elongate nozzle body having a closed distal end portion, said nozzle body having a guide hole, a fuel reservoir chamber provided forwardly of said guide hole, a tapered valve seat formed on an inner surface of the distal end portion of said nozzle body, and a plurality of pairs of first and second injection ports formed in the distal end portion of said nozzle body and spaced from one another in a direction of the periphery of said nozzle body, the angle of said first injection port relative to an axis of said nozzle body being different from the angle of said second injection port relative to the axis of said nozzle body, inner ends of said first injection ports being disposed at said valve seat, inner ends of said second injection ports being spaced from the inner ends of said first injection ports toward the distal end of said nozzle body in the direction of the axis of said nozzle body, and each pair of said first and second injection ports having a common outer end; (b) a needle valve received in said nozzle body, said needle valve having a slide portion slidably received in said guide hole, a pressure receiving portion received in said fuel reservoir chamber, and a tapered conical abutment portion formed at a distal end portion of said needle valve, and the inner ends of said first injection ports facing and sealed by an outer peripheral surface of said abutment portion of said needle valve when said abutment portion is seated on said valve seat; (c) urging means for urging said needle valve toward said valve seat, said needle valve lifting against the bias of said urging means when a fuel pressure received by said pressure receiving portion of said needle valve exceeds a predetermined pressure, so that said abutment portion is brought out of contact with said valve seat, the injection of fuel from said first injection ports being effected due to a throttle effect between said abutment portion and said valve seat until the amount of lift of said needle valve reaches a specified lift amount, and when the amount of lift of said needle valve exceeds said specified lift amount, said throttling effect being eliminated, so that the injection of the fuel from said second injection ports is effected; and (d) lift speed limiting means for lowering the speed of lift of said needle valve until the amount of lift of said needle valve reaches said specified lift amount.
Claim 3
Dependent Claim
43 words
A fuel injector according to claim 1, in which said lift speed limiting means substantially stops said needle valve temporarily, so that the amount of lift of said needle valve is maintained at a predetermined lift amount smaller than said specified lift amount.
Claim 4
Dependent Claim
95 words
A fuel injector according to claim 2, in which said urging means comprises a first spring, and said lift speed limiting means comprises a second spring, said first spring urging said needle valve toward said valve seat via a first rod, said second spring urging a second rod disposed coaxially with said first rod, and when said first rod and said second rod are at their respective limit positions close to said valve seat, said first rod and said second rod being spaced from each other by a distance corresponding to said predetermined lift amount.
Claim 5
Dependent Claim
32 words
A fuel injector according to claim 1, in which said lift speed limiting means lowers the speed of lift of said needle valve, utilizing a resistance to the flow of a fluid.
Claim 6
Dependent Claim
109 words
A fuel injector according to claim 4, in which said urging means comprises a spring and a hydraulic urging mechanism which urge said needle valve toward said valve seat, said hydraulic urging mechanism comprising a cylinder, a piston which is received in said cylinder and has a pressure receiving area larger than that of said pressure receiving portion of said needle valve, and pressure supply means for supplying to said piston a pressure far lower than said fuel pressure, said piston being operatively connected to said needle valve via a rod, and said lift speed limiting means having an orifice provided between said cylinder and said pressure supply means.
Claim 7
Dependent Claim
96 words
A fuel injector according to claim 1, in which said nozzle body has a fuel passage hole provided between said fuel reservoir chamber and said valve seat, said needle valve having an extension portion which is provided between said pressure receiving portion and said abutment portion and is received in said fuel passage hole, and guide means for preventing said needle valve from being shaken in directions perpendicular to the axis of said needle valve being provided between an outer peripheral surface of said extension portion and an inner peripheral surface of said fuel passage hole.
Claim 8
Dependent Claim
58 words
A fuel injector according to claim 6, in which said guide means comprises a plurality of projections extending radially outwardly from the outer peripheral surface of said extension portion of said needle valve, distal end surfaces of said plurality of projections being in contact with the inner peripheral surface of said fuel passage hole in said nozzle body.
Claim 9
Dependent Claim
58 words
A fuel injector according to claim 6, in which said guide means comprises a plurality of projections extending radially inwardly from the inner peripheral surface of said fuel passage hole in said nozzle body, distal end surfaces of said plurality of projections being in contact with the outer peripheral surface of said extension portion of said needle valve.
Claim 10
Dependent Claim
64 words
A fuel injector according to claim 1, in which the angle of tapering of said valve seat is substantially the same as the angle of tapering of said abutment portion of said needle valve, whereby when said needle valve is seated on said valve seat, the inner ends of said first injection ports are closed by the outer peripheral surface of said abutment portion.
Claim 11
Dependent Claim
55 words
A fuel injector according to claim 1, in which the inner ends of said second injection ports are disposed at said valve seat, whereby when said abutment portion of said needle valve is seated on said valve seat, the inner ends of said second injection ports face the outer peripheral surface of said abutment portion.
Claim 12
Dependent Claim
51 words
A fuel injector according to claim 1, in which when said abutment portion of said needle valve is seated on said valve seat, the inner ends of said second injection ports are spaced from a distal end of said abutment portion in a direction of the axis of said needle valve.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-05-17 | 1996-11-16 | 1997-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-17 | 2000-11-16 | 2001-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-17 | 2004-11-16 | 2005-05-18 | $7700.00 | Window Closed / Lapsed |