Patent US4381741A successfully refreshed from Google Patents.
US3752137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for controlling rate of fuel injection
Assignee: Ambac Industries Inc
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Filing: 1972-04-25
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Granted: 1973-08-14
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Expires: 1992-04-25
Abstract
Abstract Means for control of the rate of fuel injection in a diesel engine injection system characterized by a separate fuel injector for each engine cylinder. Each injector is supplied with discrete metered quantities of fuel which are discharged therefrom upon actuation of the injector by an injector piston which is driven by a high pressure fluid to pump the fuel through an associated injection nozzle. The rate of injection is controlled by varying the rate of flow of the high pressure fluid into the piston chamber. In the preferred embodiment, the piston comprises an elongated cylindrical member having a concentric bore open at one end and having ports opening into said bore through which the high pressure fluid passes from a communicating annulus. The piston ports are shaped in a predetermined configuration to cooperate with the annulus as the piston travels across the annulus to regulate the rate of flow of fluid into the piston bore and hence the rate of travel of the piston and the rate of injection of the fuel through the injection nozzle. In a modified embodiment, a plurality of piston ports are utilized to produce a pilot injection prior to the main injection. To facilitate the return of the piston following injection, a spill conduit connecting with the end of the piston chamber is provided which is opened in proper timed relationship to the piston movement by the valve controlling the admission of the high pressure fluid to the piston chamber.
Inventors
- 👤 J Kimberley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:52
CPC Classifications
F; F02; F02D; F02D1/00; F02D2700/00; F02D2700/02; F02D2700/0269; F02D2700/0282
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
135 words
In a fuel injector comprising cylinder-piston means for injecting discrete metered quantities of fuel from a fuel chamber to an injection nozzle, said cylinder-piston means being actuated by a high pressure fluid, the improvement comprising means for controlling the rate of fuel injection, said means comprising an open-ended bore within the piston of said cylinder-piston means, an annulus in the piston chamber of said piston-cylinder means, means for introducing pressurized fluid into said annulus, port means in said piston providing communication between said annulus and said piston bore to permit high pressure fluid to flow into said piston bore to drive said piston toward the fuel chamber, said port means being configured to cooperate with said annulus to provide a predetermined variation in rate of piston movement and hence fuel injection during the injection interval.
Claim 2
Dependent Claim
135 words
In a fuel injector comprising cylinder-piston means for injecting discrete metered quantities of fuel from a fuel chamber to an injection nozzle, said cylinder-piston means being actuated by a high pressure fluid, the improvement comprising means for controlling the rate of fuel injection, said means comprising an open-ended bore within the piston of said cylinder-piston means, an annulus in the piston chamber of said piston-cylinder means, means for introducing pressurized fluid into said annulus, port means in said piston providing communication between said annulus and said piston bore to permit high pressure fluid to flow into said piston bore to drive said piston toward the fuel chamber, said port means being configured to cooperate with said annulus to provide a predetermined variation in rate of piston movement and hence fuel injection during the injection interval.
Claim 3
Dependent Claim
50 words
The invention as claimed in claim 1 wherein said port means comprises at least one port in said piston, said port being disposed so as to travel across said annulus during movement of said piston whereby the area of said port communicating with said annulus varies during the piston stroke.
Claim 4
Dependent Claim
19 words
The invention as claimed in claim 1 wherein said piston port means comprises a plurality of axially spaced ports.
Claim 5
Dependent Claim
34 words
The invention as claimed in claim 3 including by-pass conduit means for venting said piston chamber to tank, and valve means for closing said by-pass conduit means during the injection stroke of said piston.
Claim 6
Dependent Claim
81 words
The invention as claimed in claim 3 wherein said plurality of axially spaced ports comprise a first port adapted to initially communicate with said annulus to produce a pilot injection of fuel, a second port axially spaced therefrom of reduced area, and a third port axially spaced from said second port for producing the main fuel injection stroke of the piston, said second port providing a transition movement of said piston between the pilot and main injection movements of said piston.
Claim 7
Dependent Claim
190 words
In a fuel injector comprising a fuel injecting piston means reciprocably disposed for delivering discrete metered quantities of fuel from a fuel chamber at one end thereof to a fuel injection nozzle, said piston being actuated toward said fuel chamber by the introduction of a high pressure fluid into a piston chamber adjacent the end thereof opposite said fuel chamber, valve means for controlling the introduction of metered fuel to the fuel chamber and the introduction of high pressure fluid to the piston chamber in timed sequence in response to engine generated timing signals, the improvement comprising means for controlling the rate of fuel injection, said means comprising an open-ended bore within said piston, an annulus in said piston chamber for receiving the pressurized fluid from said valve means, port means in said piston providing communication between said annulus and said piston bore to permit the pressurized fluid to flow into said piston bore to drive said piston toward said fuel chamber, said port means being configured to cooperate with said annulus to provide a predetermined variation in rate of piston movement and hence fuel injection during the injection interval.
Claim 8
Dependent Claim
190 words
In a fuel injector comprising a fuel injecting piston means reciprocably disposed for delivering discrete metered quantities of fuel from a fuel chamber at one end thereof to a fuel injection nozzle, said piston being actuated toward said fuel chamber by the introduction of a high pressure fluid into a piston chamber adjacent the end thereof opposite said fuel chamber, valve means for controlling the introduction of metered fuel to the fuel chamber and the introduction of high pressure fluid to the piston chamber in timed sequence in response to engine generated timing signals, the improvement comprising means for controlling the rate of fuel injection, said means comprising an open-ended bore within said piston, an annulus in said piston chamber for receiving the pressurized fluid from said valve means, port means in said piston providing communication between said annulus and said piston bore to permit the pressurized fluid to flow into said piston bore to drive said piston toward said fuel chamber, said port means being configured to cooperate with said annulus to provide a predetermined variation in rate of piston movement and hence fuel injection during the injection interval.
Claim 9
Dependent Claim
52 words
The invention as claimed in claim 6 wherein said valve means is adapted to vent said annulus to tank following the completion of the piston injection stroke whereby said fluid within said piston bore may empty through said port means to permit return of said piston prior to a successive injection stroke.
Claim 10
Dependent Claim
50 words
The invention as claimed in claim 6 wherein said port means comprises at least one port in said piston, said port being disposed so as to travel across said annulus during movement of said piston whereby the area of said port communicating with said annulus varies during the piston stroke.
Claim 11
Dependent Claim
40 words
The invention as claimed in claim 8 wherein said piston port is shaped so as to increase the area of communication thereof with said annulus and hence increase the rate of injection as said piston travels toward said fuel chamber.
Claim 12
Dependent Claim
40 words
The invention as claimed in claim 8 wherein said piston port is shaped so as to decrease the area of communication thereof with said annulus and hence decrease the rate of injection as said piston travels toward said fuel chamber.
Claim 13
Dependent Claim
19 words
The invention as claimed in claim 6 wherein said piston port means comprises a plurality of axially spaced ports.
Claim 14
Dependent Claim
45 words
The invention as claimed in claim 11 including by-pass conduit means for venting said piston chamber to tank, and means for closing said by-pass conduit means during the injection stroke of said piston, said means for closing said by-pass conduit means comprising said valve means.
Claim 15
Dependent Claim
81 words
The invention as claimed in claim 11 wherein said plurality of axially spaced ports comprise a first port adapted to initially communicate with said annulus to produce a pilot injection of fuel, a second port axially spaced therefrom of reduced area, and a third port axially spaced from said second port for producing the main fuel injection stroke of the piston, said second port providing a transition movement of said piston between the pilot and main injection movements of said piston.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |