Patent US7175112B2 successfully refreshed from Google Patents.
US7175112B2
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US
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Fuel injection valve
Assignee: Robert Bosch GmbH
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Filing: 2003-03-03
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Granted: 2007-02-13
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Expires: 2023-03-03
Abstract
Abstract A fuel injection valve for internal combustion engines, with a housing that contains a moving valve element whose movement counter to the elastic force of a spring element controls the fuel supply to the combustion chamber of the engine. The spring element has the form of a cylindrical sleeve whose wall contains openings at a number of locations that allow the spring element to be elastically deformed in the longitudinal direction.
Inventors
- 👤 Dietmar Uhlmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:37
CPC Classifications
F; F02; F02M; F02M47/00; F02M47/02; F02M47/027; F02M61/00; F02M61/16; F02M61/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
226 words
In a fuel injection valve for internal combustion engines, with a housing ( 1 ) that contains a moving valve element ( 12 ) whose movement counter to the elastic force of a spring element ( 30 ) controls the fuel supply to the combustion chamber ( 6 ) of the engine, the improvement wherein the spring element ( 30 ) comprises a cylindrical sleeve having a longitudinal axis ( 14 ), openings ( 45 ) at a number of locations in the wall of the sleeve, the openings ( 45 ) being separate from one another to allow the spring element ( 30 ) to be elastically deformed in the direction of the longitudinal axis ( 14 ), the openings comprise two continuous slot-shaped openings ( 45 ) disposed in a radial plane of the spring element ( 30 ), the two openings are separated from each other by a single first connecting piece ( 48 ) and a single second connecting piece ( 48 ′) disposed opposite from the first connecting piece ( 48 ), and wherein the openings ( 45 ) have a longitudinal axis ( 52 ) in relation to which they are symmetrical and wherein the openings ( 45 ) have the form of a longitudinal slot that tapers in the middle in relation to this longitudinal axis ( 52 ).
Claim 2
Dependent Claim
226 words
In a fuel injection valve for internal combustion engines, with a housing ( 1 ) that contains a moving valve element ( 12 ) whose movement counter to the elastic force of a spring element ( 30 ) controls the fuel supply to the combustion chamber ( 6 ) of the engine, the improvement wherein the spring element ( 30 ) comprises a cylindrical sleeve having a longitudinal axis ( 14 ), openings ( 45 ) at a number of locations in the wall of the sleeve, the openings ( 45 ) being separate from one another to allow the spring element ( 30 ) to be elastically deformed in the direction of the longitudinal axis ( 14 ), the openings comprise two continuous slot-shaped openings ( 45 ) disposed in a radial plane of the spring element ( 30 ), the two openings are separated from each other by a single first connecting piece ( 48 ) and a single second connecting piece ( 48 ′) disposed opposite from the first connecting piece ( 48 ), and wherein the openings ( 45 ) have a longitudinal axis ( 52 ) in relation to which they are symmetrical and wherein the openings ( 45 ) have the form of a longitudinal slot that tapers in the middle in relation to this longitudinal axis ( 52 ).
Claim 3
Dependent Claim
45 words
The fuel injection valve according to claim 1 , wherein the openings ( 45 ) are disposed in at least two radial planes, and wherein the openings of the one radial plane are rotated by 90° in relation to those in the adjacent radial plane.
Claim 4
Dependent Claim
23 words
The fuel injection valve according to claim 1 , wherein the ends ( 47 ) of the openings ( 45 ) are rounded.
Claim 5
Dependent Claim
29 words
The fuel injection valve according to claim 1 , wherein the spring element ( 30 ) is contained in the housing ( 1 ) in an elastically prestressed position.
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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) | 2010-02-12 | 2010-08-14 | 2011-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2014-02-12 | 2014-08-14 | 2015-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2018-02-12 | 2018-08-14 | 2019-02-13 | $7700.00 | Window Closed / Lapsed |