US4033507A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection valve
Assignee: Robert Bosch GmbH
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Filing: 1976-01-14
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Granted: 1977-07-05
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Expires: 1996-01-14
Abstract
Abstract A fuel injection valve for an internal combustion engine has a main fuel valve formed by a needle urged against a valve seat by a spring and also includes a solenoid to pull the valve needle away from the seat for fuel metering purposes. In addition, the valve has an extension in which a pestle with two enlarged ends is axially carried in two spring support cups. The enlarged ends of the pestle also act as valves in such a manner that even low fuel-flow causes a fluttering of the pestle, resulting in good fuel atomization.
Inventors
- 👤 Gerhard Fromel
- 👤 Peter Langenberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:38
CPC Classifications
F; F02; F02M; F02M51/00; F02M51/06; F02M51/061; F02M51/0625; F02M51/0664; F02M51/0685; F02M51/08; F02M61/00; F02M61/04; F02M61/08; F02M2200/00; F02M2200/50; F02M2200/505
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
174 words
A fuel injection valve for an internal combustion engine, said valve including a housing, and within the housing a coaxial arrangement of an internal solenoid coil, a magnetic core, a movable armature, a valve seat member, and a valve needle carried by said armature and cooperating with the valve seat in said valve seat member for metering fuel past the valve seat member, the improvement comprising: a connecting cylinder, attached to said valve housing; and a mechanical fuel preparation means, located in said connecting cylinder separately from and downstream of said valve seat member and said valve needle, said connecting cylinder further including a first spring support cup; a pestle with two enlarged ends, one of said ends penetrating a central hole in said first support cup; a second spring support cup with a central hole penetrated by the second of said two enlarged ends of said pestle; and a spring, disposed between and urging apart said first and said second spring support cups, thereby pressing them against the enlarged ends of said pestle.
Claim 2
Dependent Claim
174 words
A fuel injection valve for an internal combustion engine, said valve including a housing, and within the housing a coaxial arrangement of an internal solenoid coil, a magnetic core, a movable armature, a valve seat member, and a valve needle carried by said armature and cooperating with the valve seat in said valve seat member for metering fuel past the valve seat member, the improvement comprising: a connecting cylinder, attached to said valve housing; and a mechanical fuel preparation means, located in said connecting cylinder separately from and downstream of said valve seat member and said valve needle, said connecting cylinder further including a first spring support cup; a pestle with two enlarged ends, one of said ends penetrating a central hole in said first support cup; a second spring support cup with a central hole penetrated by the second of said two enlarged ends of said pestle; and a spring, disposed between and urging apart said first and said second spring support cups, thereby pressing them against the enlarged ends of said pestle.
Claim 3
Dependent Claim
23 words
A fuel injection valve as defined by claim 1, wherein said connecting cylinder conforms to the geometrical requirements of the internal combustion engine.
Claim 4
Dependent Claim
60 words
A fuel injection valve as defined in claim 1, wherein said first spring support cup has a central valve seat cooperating with one enlarged end of said pestle to thereby form a fuel outlet valve and wherein said central hole in said first spring support cap is larger than the diameter of said pestle, thereby permitting penetration with radial clearance.
Claim 5
Dependent Claim
22 words
A fuel injection valve as defined by claim 3, wherein said first spring support cup is fixedly positioned in said connecting cylinder.
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) | 1980-07-04 | 1981-01-03 | 1981-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-04 | 1985-01-03 | 1985-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-04 | 1989-01-03 | 1989-07-05 | $7700.00 | Window Closed / Lapsed |