Patent US3625192A successfully refreshed from Google Patents.
US3625192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection nozzle with hydraulic valve-closing means
Assignee: Deutz Allis Corp
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Filing: 1969-12-12
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Granted: 1971-12-07
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Expires: 1989-12-12
Abstract
Abstract A fuel injection system having a nozzle with a differential valve normally biased to a closed position by means of a spring with augmentation of hydraulic means. The hydraulic means include a source of pressurized fluid with pressure-regulating means to provide a fluid pressure biasing the differential valve to a closed position.
Inventors
- 👤 Alexander Dreisin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:22
CPC Classifications
F; F02; F02M; F02M41/00; F02M41/08; F02M41/10; F02M41/12; F02M47/00; F02M47/06; F02M61/00; F02M61/16; F02M61/20; F02M61/205
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
203 words
A fuel injection system for an internal combustion engine comprising, a fuel injection pump on an internal combustion engine, an auxiliary source of pressurized fluid, a fuel injection nozzle including a differential valve, said differential valve defining a high-pressure fuel injection chamber with said differential valve opening in response to highpressure fuel in said high-pressure chamber, conduit means connecting said fuel injection pump with said high-pressure fuel injection chamber of said differential valve for supplying highpressure fuel thereto and to said engine and controlling the opening of said differential valve, a plunger means defining a needle of said differential valve, said plunger means reciprocally mounted in said nozzle defining a variable volume fluid chamber, a spring in said fluid chamber normally biasing said differential valve to a closed position, conduit means connecting said source of pressurized fluid to said variable volume fluid chamber for continuously supplying pressurized fluid from said source of pressurized fluid to said variable volume fluid chamber of said nozzle, said differential valve thereby opening in response to high-pressure fuel from said fuel injection pump and closing in response to the biasing force of said spring and the augmenting force of the pressurized fluid in said variable volume fluid chamber.
Claim 2
Dependent Claim
203 words
A fuel injection system for an internal combustion engine comprising, a fuel injection pump on an internal combustion engine, an auxiliary source of pressurized fluid, a fuel injection nozzle including a differential valve, said differential valve defining a high-pressure fuel injection chamber with said differential valve opening in response to highpressure fuel in said high-pressure chamber, conduit means connecting said fuel injection pump with said high-pressure fuel injection chamber of said differential valve for supplying highpressure fuel thereto and to said engine and controlling the opening of said differential valve, a plunger means defining a needle of said differential valve, said plunger means reciprocally mounted in said nozzle defining a variable volume fluid chamber, a spring in said fluid chamber normally biasing said differential valve to a closed position, conduit means connecting said source of pressurized fluid to said variable volume fluid chamber for continuously supplying pressurized fluid from said source of pressurized fluid to said variable volume fluid chamber of said nozzle, said differential valve thereby opening in response to high-pressure fuel from said fuel injection pump and closing in response to the biasing force of said spring and the augmenting force of the pressurized fluid in said variable volume fluid chamber.
Claim 3
Dependent Claim
34 words
A fuel injection system for an internal combustion engine as set forth in claim 1 wherein said source of pressurized fluid includes an auxiliary pump in an auxiliary system connected to said fluid chamber.
Claim 4
Dependent Claim
43 words
A fuel injection system for an internal combustion engine as set forth in claim 1 wherein said source of pressurized fluid incLudes an auxiliary fluid system comprising, an auxiliary pump, relief valve means for maintaining a predetermined pressure level in said auxiliary system.
Claim 5
Dependent Claim
65 words
A fuel injection system for an internal combustion engine as set forth in claim 1 including an auxiliary fluid system comprising, an auxiliary fluid pump, a fluid supply supplying fluid to said auxiliary pump, a nonreturnable valve connected to the discharge side of said auxiliary pump, a relief valve maintaining a predetermined pressure level in said auxiliary system and returning pressurized fluid to said supply.
Claim 6
Dependent Claim
74 words
A fuel injection system for an internal combustion engine as set forth in claim 1 wherein said source of pressurized fluid comprises an auxiliary fluid system including a relief valve for maintaining a predetermined pressure level in said auxiliary system, a bleed passage connected between said fuel injection pump and said auxiliary system to supply pressurized fluid from said fuel injection pump and to thereby produce a predetermined operating pressure in said auxiliary system.
Claim 7
Dependent Claim
42 words
A fuel injection system for an internal combustion engine as set forth in claim 2 including means on said engine driving said auxiliary pump, said spring effectively providing the biasing means biasing said differential valve to a closed position at cranking speed.
Claim 8
Dependent Claim
111 words
A fuel injection system for an internal combustion engine as set forth in claim 1 wherein said source of pressurized fluid includes an auxiliary fluid system comprising a common line transmitting hydraulic fluid, a plurality of fuel injection nozzles, conduit means connecting the variable volume chamber of each of said plurality fuel injection nozzles to said common line, an auxiliary pump having a fluid supply, a unidirectional valve permitting the flow of pressurized fuel from said pump to said line, a relief valve connected between said line and the fuel supply for maintaining a predetermined pressure in said line and permitting the return flow of pressurized fluid to the fluid supply.
Claim 9
Dependent Claim
81 words
A fuel injection system for an internal combustion engine as set forth in claim 1 wherein said source of pressurized fluid includes an auxiliary fluid system comprising, a constant pressure conduit connected to the fluid chamber of at least one fuel injection nozzle, said fuel injection pump defining a bleed passage bleeding pressurized fuel from the pumping chamber of said injection pump to said constant pressure conduit, a pressure relief valve for maintaining a predetermined pressure level in said auxiliary system.
Claim 10
Dependent Claim
26 words
A fuel injection system for an internal combustion engine as set forth in claim 3 wherein said relief valve includes means to very the pressure level.
Claim 11
Dependent Claim
50 words
A fuel injection system for an internal combustion engine as set forth in claim 1 wherein said needle of said differential valve in said fuel injector is integral with said plunger means and defines said variable volume chamber receiving said spring normally biasing said differential valve to a closed position.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |