US3836080A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection nozzle
Assignee: Ambac Industries Inc
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Filing: 1973-09-10
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Granted: 1974-09-17
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Expires: 1993-09-10
Abstract
Abstract In a fuel injection nozzle of the inwardly opening type wherein the spring-loaded nozzle valve is opened by metered pulses of high pressure fuel delivered in timed sequence by a fuel injection pump, an improved nozzle valve which reduces engine gaseous emissions and exhaust smoke by permitting a reduced sac volume. The minimum fuel flow through the valve is controlled by the valve element configuration rather than the valve seat intersection with the sac as in the conventional nozzle. The present nozzle construction facilitates manufacturing and permits a change of the valve delivery characteristics by modification of the valve element rather than the less accessible valve seat. The present construction provides an increased valve seat flow capacity for a given seat angle and valve lift.
Inventors
- 👤 D Butterfield
- 👤 A Marchetti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:28
CPC Classifications
F; F02; F02M; F02M61/00; F02M61/16; F02M61/18
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
135 words
In a fuel injection nozzle assembly comprising a nozzle body, a bore within said body, a valve element disposed within said bore for recipricatory movement between open and closed positions, a frusto-conical valve seaT at the lower end of said bore, the lower end of said valve element being adapted to engage said valve seat to seal the passage therebetween, a sac beneath said valve seat in communication therewith, spray orifices extending outwardly through said valve body from said sac, and means for introducing pressurized fuel into said bore above said valve seat, the improvement comprising a circular control edge on said valve element lower end which defines in cooperation with said valve seat the minimum fuel flow area between said valve element and said valve seat in the open position of said valve element.
Claim 2
Dependent Claim
135 words
In a fuel injection nozzle assembly comprising a nozzle body, a bore within said body, a valve element disposed within said bore for recipricatory movement between open and closed positions, a frusto-conical valve seaT at the lower end of said bore, the lower end of said valve element being adapted to engage said valve seat to seal the passage therebetween, a sac beneath said valve seat in communication therewith, spray orifices extending outwardly through said valve body from said sac, and means for introducing pressurized fuel into said bore above said valve seat, the improvement comprising a circular control edge on said valve element lower end which defines in cooperation with said valve seat the minimum fuel flow area between said valve element and said valve seat in the open position of said valve element.
Claim 3
Dependent Claim
24 words
The invention claimed in claim 1 wherein said control edge is formed by the intersection of two surfaces of revolution on said valve element.
Claim 4
Dependent Claim
17 words
The invention claimed in claim 2 wherein one of said surfaces of revolution is a conical surface.
Claim 5
Dependent Claim
17 words
The invention claimed in claim 1 wherein the side walls of said sac have a frusto-conical configuration.
Claim 6
Dependent Claim
23 words
The invention claimed in claim 4 wherein the included angle of said frusto-conical valve seat is greater than that of said sac walls.
Claim 7
Dependent Claim
163 words
In a fuel injection nozzle assembly comprising a nozzle body, a bore within said body, a valve element disposed within said bore for recipricatory movement between open and closed positions, a frusto-conical valve seat at the lower end of said bore, the lower end of said valve element being adapted to engage said valve seat to seal the passage therebetween, a sac beneath said valve seat in communication therewith, spray orifices extending outwardly through said valve body from said sac, and means for introducing pressurized fuel into said bore above said valve seat, the improvement wherein said valve element lower end configuration comprises a conical surface at the valve element tip, and a frusto-conical surface adjacent said conical surface, the intersection of said conical and frusto-conical valve element surfaces forming a circular control edge which cooperates with said valve seat to define the minimum fuel flow area between said valve element and said valve seat in the open position of said valve element.
Claim 8
Dependent Claim
163 words
In a fuel injection nozzle assembly comprising a nozzle body, a bore within said body, a valve element disposed within said bore for recipricatory movement between open and closed positions, a frusto-conical valve seat at the lower end of said bore, the lower end of said valve element being adapted to engage said valve seat to seal the passage therebetween, a sac beneath said valve seat in communication therewith, spray orifices extending outwardly through said valve body from said sac, and means for introducing pressurized fuel into said bore above said valve seat, the improvement wherein said valve element lower end configuration comprises a conical surface at the valve element tip, and a frusto-conical surface adjacent said conical surface, the intersection of said conical and frusto-conical valve element surfaces forming a circular control edge which cooperates with said valve seat to define the minimum fuel flow area between said valve element and said valve seat in the open position of said valve element.
Claim 9
Dependent Claim
24 words
The invention claimed in claim 6 wherein the included angle of said valve element frusto-conical surface is greater than that of said valve seat.
Claim 10
Dependent Claim
51 words
The invention claimed in claim 6 wherein the included angle of said valve element conical surface is greater than that of said valve element frusto-conical surface so that the fuel flow area below said control edge is greater than that at said control edge at any position of said valve element.
Claim 11
Dependent Claim
17 words
The invention claimed in claim 6 wherein the side walls of said sac have a frusto-conical configuration.
Claim 12
Dependent Claim
23 words
The invention claimed in claim 9 wherein the included angle of said frusto-conical valve seat is greater than that of said sac walls.
References Cited (Backward Citations)
GB906603A
Cited
US3391871A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |