US3640466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection system for an internal combustion piston engine
Assignee: Sulzer AG
•
Filing: 1969-10-24
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Granted: 1972-02-08
•
Expires: 1989-10-24
Abstract
Abstract The valve needle is held closed under the differential pressure of the fuel acting at the ends of the needle. In order to open the valve, a low pressure is applied to lift the control valve body. This allows the fuel to pass from the rear fuel chamber causing a pressure drop and a pressure differential to occur to unseat the needle valve.
Inventors
- 👤 Anton Steiger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:07
CPC Classifications
F; F02; F02M; F02M47/00; F02M47/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
252 words
A fuel injection system for an internal combustion piston engine comprising: a fuel storage chamber; and an injection valve having a plurality of jet bores, a valve seat, a front fuel chamber adjacent said valve seat, a rear fuel chamber remote from said valve seat, a valve needle slidably mounted between said front fuel chamber and said rear fuel chamber for seating on said valve seat, a fuel duct extending along said needle communicating said front fuel chamber with said fuel storage chamber, a throttle bore communicating said fuel duct with said rear fuel chamber, and means for selectively connecting said rear fuel chamber to a chamber remote from said fuel duct and at a lower pressure than the fuel pressure, said means includes a stepped bore in said valve communicating with said rear fuel chamber, a valve body having a piston slidably disposed in said bore in sealtight relation for closing said bore from said rear fuel chamber, said piston dividing said bore into a front cylinder chamber and a rear cylinder chamber, said valve body having a bore communicating said stepped bore adjacent said rear fuel chamber with said rear cylinder chamber, a control means connected to said front cylinder chamber to transmit a control pressure thereto less than the fuel pressure for lifting of said valve body to communicate said rear fuel chamber with said stepped bore, and an overflow line connected to said rear cylinder chamber, said overflow line being at a pressure lower than the control pressure.
Claim 2
Dependent Claim
252 words
A fuel injection system for an internal combustion piston engine comprising: a fuel storage chamber; and an injection valve having a plurality of jet bores, a valve seat, a front fuel chamber adjacent said valve seat, a rear fuel chamber remote from said valve seat, a valve needle slidably mounted between said front fuel chamber and said rear fuel chamber for seating on said valve seat, a fuel duct extending along said needle communicating said front fuel chamber with said fuel storage chamber, a throttle bore communicating said fuel duct with said rear fuel chamber, and means for selectively connecting said rear fuel chamber to a chamber remote from said fuel duct and at a lower pressure than the fuel pressure, said means includes a stepped bore in said valve communicating with said rear fuel chamber, a valve body having a piston slidably disposed in said bore in sealtight relation for closing said bore from said rear fuel chamber, said piston dividing said bore into a front cylinder chamber and a rear cylinder chamber, said valve body having a bore communicating said stepped bore adjacent said rear fuel chamber with said rear cylinder chamber, a control means connected to said front cylinder chamber to transmit a control pressure thereto less than the fuel pressure for lifting of said valve body to communicate said rear fuel chamber with said stepped bore, and an overflow line connected to said rear cylinder chamber, said overflow line being at a pressure lower than the control pressure.
Claim 3
Dependent Claim
31 words
A fuel injection system as set forth in claim 1 wherein said overflow line includes a pressure-maintaining valve for maintaining a pressure higher than atmospheric pressure in said rear cylinder chamber.
Claim 4
Dependent Claim
179 words
A fuel injection system for an internal combustion piston engine comprising: a fuel storage chamber; and an injection valve having a plurality of jeT bores, a valve seat, a front fuel chamber adjacent said valve seat, a rear fuel chamber remote from said valve seat, a valve needle slidably mounted between said front fuel chamber and said rear fuel chamber for seating on said valve seat, a fuel duct extending along said needle communicating said front fuel chamber with said fuel storage chamber, a throttle bore communicating said fuel duct with said rear fuel chamber, and means for selectively connecting said rear fuel chamber to a chamber remote from said fuel duct and at a lower pressure than the fuel pressure, said means including a control line, a pump for delivering pressure medium through said control line at the control pressure, a control valve in said control line to selectively pass the pressure medium therethrough and a control valve in said injection valve connected to said control line for connecting said rear fuel chamber to said lower pressure chamber.
Claim 5
Dependent Claim
179 words
A fuel injection system for an internal combustion piston engine comprising: a fuel storage chamber; and an injection valve having a plurality of jeT bores, a valve seat, a front fuel chamber adjacent said valve seat, a rear fuel chamber remote from said valve seat, a valve needle slidably mounted between said front fuel chamber and said rear fuel chamber for seating on said valve seat, a fuel duct extending along said needle communicating said front fuel chamber with said fuel storage chamber, a throttle bore communicating said fuel duct with said rear fuel chamber, and means for selectively connecting said rear fuel chamber to a chamber remote from said fuel duct and at a lower pressure than the fuel pressure, said means including a control line, a pump for delivering pressure medium through said control line at the control pressure, a control valve in said control line to selectively pass the pressure medium therethrough and a control valve in said injection valve connected to said control line for connecting said rear fuel chamber to said lower pressure chamber.
Claim 6
Dependent Claim
133 words
A fuel injection valve for an internal combustion engine comprising: a valve seat, a front fuel chamber adjacent said valve seat, a rear fuel chamber remote from said valve seat, a valve needle slidably mounted between said first chambers for seating on said valve seat, a fuel duct connected to said front fuel chamber for supplying fuel thereto, a low-pressure chamber adjacent said rear fuel chamber and remote from said fuel duct, valve means selectively sealing said rear fuel chamber from said low-pressure chamber; and a throttle bore connecting said fuel duct with said rear fuel chamber to permit the occurrence of a lower pressure in said rear fuel chamber than in said front fuel chamber upon removal of fuel from said rear fuel chamber through said valve means to said low-pressure chamber.
Claim 7
Dependent Claim
133 words
A fuel injection valve for an internal combustion engine comprising: a valve seat, a front fuel chamber adjacent said valve seat, a rear fuel chamber remote from said valve seat, a valve needle slidably mounted between said first chambers for seating on said valve seat, a fuel duct connected to said front fuel chamber for supplying fuel thereto, a low-pressure chamber adjacent said rear fuel chamber and remote from said fuel duct, valve means selectively sealing said rear fuel chamber from said low-pressure chamber; and a throttle bore connecting said fuel duct with said rear fuel chamber to permit the occurrence of a lower pressure in said rear fuel chamber than in said front fuel chamber upon removal of fuel from said rear fuel chamber through said valve means to said low-pressure chamber.
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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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |