US4662338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection nozzle
Assignee: Robert Bosch GmbH
•
Filing: 1982-02-11
•
Granted: 1987-05-05
•
Expires: 2002-02-11
Abstract
Abstract A fuel injection nozzle for internal combustion engines which has a valve needle loaded in the closing direction and is radially guided and supported in an axially displaceable manner within a nozzle body. The movement of the valve needle is effected in the opening and closing directions in a selectively variable manner, a spring-loaded supplementary mass which performs a dual function being disposed in the nozzle interior. In the opening direction of the valve needle, the supplementary mass is displaced along with the valve needle, while in the closing direction the two elements are separated. The supplementary mass influences the movement of the valve needle both inertially, as the result of its mass, and by effecting a speed-dependent damping, as the result of the positive displacement of a fluid from damping chambers, the whole being adapted to a constant or variable throttle disposed in the fuel inlet conduit.
Inventors
- 👤 Katsuoki Itoh
- 👤 Iwan Komaroff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:48
CPC Classifications
F; F02; F02M; F02M45/00; F02M45/02; F02M45/04; F02M45/08; F02M45/083; F02M61/00; F02M61/16; F02M61/20
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
119 words
A fuel injection nozzle for internal combustion engines having a spring loaded needle supported in an axially displaceable manner within a nozzle body and further including a spring-loaded supplementary damping mass which influences at least the needle opening movement, characterized in that a fuel throttle means is disposed in a fuel inlet line to said injection nozzle and that said supplementary damping mass is physically displaced from said spring loaded needle and cooperates with a damping chamber exposed to fuel flow, said supplementary damping mass being guided with a predetermined radial play to enable passage therethrough of fuel whereby valve needle supplementary damping is subjected to the inertia of said damping mass as well as being dependent on speed.
Claim 2
Dependent Claim
119 words
A fuel injection nozzle for internal combustion engines having a spring loaded needle supported in an axially displaceable manner within a nozzle body and further including a spring-loaded supplementary damping mass which influences at least the needle opening movement, characterized in that a fuel throttle means is disposed in a fuel inlet line to said injection nozzle and that said supplementary damping mass is physically displaced from said spring loaded needle and cooperates with a damping chamber exposed to fuel flow, said supplementary damping mass being guided with a predetermined radial play to enable passage therethrough of fuel whereby valve needle supplementary damping is subjected to the inertia of said damping mass as well as being dependent on speed.
Claim 3
Dependent Claim
54 words
A fuel injection nozzle as defined by claim 1, characterized in that said nozzle body further includes a guide means for said valve needle, and a support for a valve needle closing spring and a restoring spring, said closing spring and restoring spring being encompassed by said supplementary damping mass and said nozzle holder.
Claim 4
Dependent Claim
39 words
A fuel injection nozzle as defined by claim 1, characterized in that said nozzle needle further includes a strokestop disc, and said supplementary damping mass has an inner annular flange at a predetermined spaced distance from said strokestop disc.
Claim 5
Dependent Claim
45 words
A fuel injection nozzle as defined by claim 1, characterized in that said nozzle body further includes concentric annular faces which lie in plural horizontal planes and thereby provide support for said valve needle closing spring and said restoring spring of said supplementary damping mass.
Claim 6
Dependent Claim
29 words
A fuel injection nozzle as defined by claim 1, characterized in that said fuel throttle means is mechanically adjustable as a function of rpm and of fuel injection quantity.
Claim 7
Dependent Claim
29 words
A fuel injection nozzle as defined by claim 1, characterized in tht said fuel throttle means is hydraulically adjustable as a function of rpm and of fuel injection quantity.
Claim 8
Dependent Claim
29 words
A fuel injection nozzle as defined by claim 1, characterized in that said fuel throttle means is electrically adjustable as a function of rpm and of fuel injection quantity.
Claim 9
Dependent Claim
82 words
A fuel injection nozzle as defined by claim 1, characterized in that said valve needle opens outwardly and said supplementary damping mass comprises an annular wall concentric with said valve needle, said annular wall further being spaced apart axially from said nozzle body and a nozzle holder to form an annular damping chamber having an axial damping chamber distance, said supplementary damping mass, said nozzle body and said nozzle holder further being spaced at predetermined radial distances to provide said radial play.
Claim 10
Dependent Claim
27 words
A fuel injection nozzle as defined by claim 8, characterized in that said axial damping-chamber distance of said supplementary damping mass simultaneously forms a stroke stop therefore.
Claim 11
Dependent Claim
49 words
A fuel injection nozzle as defined in claim 1, characterized in that said valve needle opens inwardly and said supplementary damping mass is disposed axially of said valve needle and forms annular damping chambers with said nozzle holder and an annular end chamber having an upper spring support plate.
Claim 12
Dependent Claim
32 words
A fuel injection nozzle as defined by claim 10, characterized in that a restoring spring is disposed in said damping chamber formed by said supplementary damping mass together with said nozzle holder.
References Cited (Backward Citations)
US1658026A
Cited
US3319613A
Cited
US3575145A
Cited
US3718283A
Cited
US3628024A
Cited
US3753426A
Cited
US4104992A
Cited
US4300873A
Cited
US4363446A
Cited
US4341351A
Cited
US4350301A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-05-04 | 1990-11-03 | 1991-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-04 | 1994-11-03 | 1995-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-04 | 1998-11-03 | 1999-05-05 | $7700.00 | Window Closed / Lapsed |