US3737100A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internally cooled unit injector
Assignee: Deutz Allis Corp
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Filing: 1971-11-18
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Granted: 1973-06-05
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Expires: 1991-11-18
Abstract
Abstract A unit fuel injector providing cooling of the nozzle by the fuel, with a valve arrangement in the return passage to intermittently stop circulation of the fuel and a check valve in the fuel delivery passage to prevent blow-back of combustion gases during the engine power stroke.
Inventors
- 👤 A Dreisin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:04
CPC Classifications
F; F02; F02M; F02M53/00; F02M53/04; F02M53/043; F02M57/00; F02M57/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
165 words
A unit fuel injector having fuel cooling means comprising a fuel injector housing defining an inlet passage and an outlet passage, a plunger reciprocating in said housing and defining a fuel injection pumping chamber with said inlet passage intermittently communicating with said pumping chamber, means defining an injection nozzle adapted for injecting fuel in a combustion chamber, means defining supply passage means connected between said injection pumping chamber and said injection nozzle, a differential valve in said injection nozzle, a check valve positioned in said supply passage means adjacent said differential valve, return passage means connected between said differential valve and said outlet passage through said plunger, said plunger defining a passage providing port means in said return passage means to selectively close said return passage means during fuel injection, said check valve and said port means on said plunger operating as means for trapping fuel in said differential valve chamber to prevent high pressure gases from entering said differential valve from the combustion chamber.
Claim 2
Dependent Claim
165 words
A unit fuel injector having fuel cooling means comprising a fuel injector housing defining an inlet passage and an outlet passage, a plunger reciprocating in said housing and defining a fuel injection pumping chamber with said inlet passage intermittently communicating with said pumping chamber, means defining an injection nozzle adapted for injecting fuel in a combustion chamber, means defining supply passage means connected between said injection pumping chamber and said injection nozzle, a differential valve in said injection nozzle, a check valve positioned in said supply passage means adjacent said differential valve, return passage means connected between said differential valve and said outlet passage through said plunger, said plunger defining a passage providing port means in said return passage means to selectively close said return passage means during fuel injection, said check valve and said port means on said plunger operating as means for trapping fuel in said differential valve chamber to prevent high pressure gases from entering said differential valve from the combustion chamber.
Claim 3
Dependent Claim
39 words
A unit fuel injector having fuel cooling meanS as set forth in claim 1 wherein said check valve defines a pressure sensitive valve element permitting unidirectional flow of hydraulic fuel from said fuel injection chamber to said differential valve.
Claim 4
Dependent Claim
45 words
A unit fuel injector having fuel cooling means as set forth in claim 1 wherein said port means on said plunger defines an annular groove, said annular groove normally opening said return passage means for connection to a drain manifold of the fuel injection system.
Claim 5
Dependent Claim
78 words
A unit fuel injector having fuel cooling means as set forth in claim 1 wherein said plunger defines a land for initiating and terminating fuel injection upon register with said inlet passage means and said outlet passage means when said plunger is reciprocated, a cooling land defining said port means as an annular groove normally opening said return passage means to provide flow of cooling fluid through said return passage when said fuel injector is not injecting fuel.
Claim 6
Dependent Claim
53 words
A unit fuel injector having fuel cooling means as set forth in claim 1 wherein said nozzle defines a differential valve chamber, said differential valve positioned in said differential valve chamber, means connecting said supply passage means and said return passage means to said valve chamber for circulating fuel for cooling said nozzle.
Claim 7
Dependent Claim
46 words
A unit fuel injector having fuel cooling means as set forth in claim 1 wherein said nozzle includes a differential valve, a check valve in said nozzle adjacent said differential valve to increase sensitivity to return flow from said differential valve to said high pressure chamber.
Claim 8
Dependent Claim
74 words
A unit fuel injector having fuel cooling means as set forth in claim 1 including a cam driven by said engine, a cam follower operating in response to rotation of said cam for operating said plunger, said cam defining a cam lobe for driving said plunger to close said port means prior to initiation of the power stroke of the engine and open said port means substantially at the end of the power stroke.
Claim 9
Dependent Claim
81 words
A unit fuel injector having a fuel cooling means as set forth in claim 1 including a cam, means for driving said cam, a cam follower engaging said cam and connected to said plunger, said cam driving said cam follower and said plunger to initiate and terminate fuel injection on the rising portion of said cam with a sufficient dwell for maintaining the port means in a closed position during the greater portion of the power stroke of the corresponding cylinder.
Claim 10
Dependent Claim
89 words
A unit fuel injector having a fuel cooling means as set forth in claim 1 wherein said plunger includes a pumping land on said plunger for initiation and termination of fuel injection upon closing of said inlet port and opening of said return port respectively, a cam for driving said cam, a cam follower driven by said cam driving said plunger, said cam defining a lobe for lifting said cam follower and said plunger to maintain the port means in the closed position for substantially 90* of cam rotation.
Claim 11
Dependent Claim
98 words
A unit fuel injector having a fuel cooling means as set forth in claim 1 wherein said plunger includes a land defining initiation and termination of fuel injection upon closing of an inlet port with said high compression chamber and opening of an outlet port with said high pressure chamber, a second land on said plunger defining said port, a cam defining a lobe having a dwell of substantially 70* whereby said cam follower maintains said return passage means in a closed position for trapping fuel in said differential valve chamber to prevent blow-back in said differential chamber.
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) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |