US4327690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection valve
Assignee: Robert Bosch GmbH
•
Filing: 1979-06-07
•
Granted: 1982-05-04
•
Expires: 1999-06-07
Abstract
Abstract The invention relates to a fuel injection valve having a plug connection to the fuel line, wherein at least two sealing rings are provided between the connection stud and the fuel line nipple in order to obtain emergency sealing capacity.
Inventors
- 👤 Rudolf Sauer
- 👤 Waldemar Hans
- 👤 Heinrich Knapp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:24
CPC Classifications
F; F02; F02M; F02M69/00; F02M69/46; F02M69/462; F02M69/465; F02M61/00; F02M61/14; F02M61/145; F02M2200/00; F02M2200/85; F02M2200/858
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
130 words
A fuel injection valve such as a magnetic valve, comprising in combination, a valve body having a pressure connection stud, a fuel line plug nipple adapted to be fitted onto said connection stud, a first elastic sealing ring disposed between said nipple and said stud, at least one other sealing ring disposed adjacent to said first elastic sealing ring between said nipple and said stud, and a heat-resistant stuffing box ring exposed on one side to surrounding air disposed between said stud and said nipple, said stuffing box ring serving to seal said nipple and said stud axially as well as annularly, said other sealing ring possessing a melt temperature below that of said elastic sealing ring, whereby emergency sealing can be effected upon meltdown of said other sealing ring.
Claim 2
Dependent Claim
130 words
A fuel injection valve such as a magnetic valve, comprising in combination, a valve body having a pressure connection stud, a fuel line plug nipple adapted to be fitted onto said connection stud, a first elastic sealing ring disposed between said nipple and said stud, at least one other sealing ring disposed adjacent to said first elastic sealing ring between said nipple and said stud, and a heat-resistant stuffing box ring exposed on one side to surrounding air disposed between said stud and said nipple, said stuffing box ring serving to seal said nipple and said stud axially as well as annularly, said other sealing ring possessing a melt temperature below that of said elastic sealing ring, whereby emergency sealing can be effected upon meltdown of said other sealing ring.
Claim 3
Dependent Claim
31 words
A fuel injection valve in accordance with claim 1, including at least one of a guide ring and an intermediate ring disposed on said connection stud adjacent to said sealing rings.
Claim 4
Dependent Claim
34 words
A fuel injection valve in accordance with claim 2, including a ring containing asbestos, such as an asbestos cord ring or a plastic ring with asbestos filling material, is disposed on said connection stud.
Claim 5
Dependent Claim
26 words
A fuel injection valve in accordance with claim 3, wherein said asbestos cord ring is enclosed by soft metal or is wound around with Teflon yarn.
Claim 6
Dependent Claim
45 words
A fuel injection valve in accordance with claim 2, wherein said connection stud is provided with a step shoulder and said heat-resistant ring is an axially stressed stuffing-box ring axially supported on said connection stud and seals against said step shoulder toward the air side.
Claim 7
Dependent Claim
43 words
A fuel injection valve in accordance with claim 5, including at least one intermediate ring and a spring supported within the plug nipple for stressing said stuffing-box ring on the side remote from said step shoulder via said at least one intermediate ring.
Claim 8
Dependent Claim
35 words
A fuel injection valve in accordance with claim 6, including an easily melting plastic ring, as a safety means, disposed adjacent to at least one of said asbestos cord rings or said stuffing box ring.
Claim 9
Dependent Claim
46 words
A fuel injection valve in accordance with claim 7, including a melting ring and a spring-stressed hard ring which acts in the manner of a piston on the melting ring in the direction of at least one of said asbestos cord rings and said stuffing-box ring.
Claim 10
Dependent Claim
31 words
A fuel injection valve in accordance with claim 1, including a graphite ring, an O-ring and a ring containing asbestos are disposed in sequence as viewed from the air side inward.
Claim 11
Dependent Claim
16 words
A fuel injection valve in accordance with claim 9, wherein said O-ring is made of Viton.
Claim 12
Dependent Claim
30 words
A fuel injection valve in accordance with claim 9, wherein the asbestos is the filling material of a plastic for said asbestos ring which only melts at a higher temperature.
Claim 13
Dependent Claim
22 words
A fuel injection valve in accordance with claim 9, wherein said rings are disposed in axially adjacent relationship on said connection stud.
Claim 14
Dependent Claim
52 words
A fuel injection valve in accordance with claim 12, wherein said connection stud is provided with a shoulder and including a hard guide ring interposed between said rings and supported on said shoulder for separating said rings thereby permitting at least some of said rings to be decoupled from one another axially.
Claim 15
Dependent Claim
56 words
A fuel injection valve in accordance with claim 1, wherein said plug nipple is provided with a bore and wherein said connection stud and said nipple bore are provided with conical ring surfaces opposite one another and a ring having a rhomboid cross section disposed between said conical ring surfaces for accepting radial and axial forces.
Claim 16
Dependent Claim
18 words
A fuel injection valve in accordance with claim 14, wherein said rhomboid-shaped ring is made of heat-resistant material.
References Cited (Backward Citations)
US2521127A
Cited
US2724602A
Cited
US2844421A
Cited
US3284086A
Cited
US3768839A
Cited
US3776209A
Cited
US3990730A
Cited
US4006881A
Cited
US4157835A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-03 | 1985-11-02 | 1986-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-03 | 1989-11-02 | 1990-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-03 | 1993-11-02 | 1994-05-04 | $7700.00 | Window Closed / Lapsed |