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US4171099A
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US
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Fuel injection nozzle for internal combustion engines
Assignee: Robert Bosch GmbH
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Filing: 1976-12-16
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Granted: 1979-10-16
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Expires: 1996-12-16
Abstract
Abstract Improvements in a fuel injection nozzle for internal combustion engines having a needle valve positioned in a chamber constrained by a closure spring positioned in another chamber thereabove, there also being provided an intermediate piston which includes a portion that extends into the spring chamber therebeneath and further includes a working surface area that is subjected to pressures in still another chamber positioned thereabove.
Inventors
- 👤 Odon Kopse
- 👤 Richard Kinzel
- 👤 Ewald Eblen
- 👤 Willi Voit
- 👤 Gregor Schuster
- 👤 Franz Eheim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:10
CPC Classifications
F; F02; F02M; F02M47/00; F02M47/06; F02M59/00; F02M59/20; F02M59/32; F02M61/00; F02M61/16; F02M61/20; F02M61/205; F02M63/00; F02M63/0003
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
125 words
A fuel injection nozzle having a bored body, axially spaced chambers in said body, a fuel supply inlet and a fuel discharge outlet, a fluid pressure operated needle valve extending into one chamber and a closure spring for said needle valve in another of said chambers arranged to cooperate with said needle valve, wherein the improvement comprises an hydraulically actuated intermediate piston including upper and lower working surfaces one of which is subjected to pressure in the spring chamber and another of which is subjected to fluid pressure in the chamber provided immediately above said spring chamber, and said fluid pressure chamber being connected to a line leading to a pump whereby closing pressure on the needle valve may be increased in a controlled manner.
Claim 2
Dependent Claim
125 words
A fuel injection nozzle having a bored body, axially spaced chambers in said body, a fuel supply inlet and a fuel discharge outlet, a fluid pressure operated needle valve extending into one chamber and a closure spring for said needle valve in another of said chambers arranged to cooperate with said needle valve, wherein the improvement comprises an hydraulically actuated intermediate piston including upper and lower working surfaces one of which is subjected to pressure in the spring chamber and another of which is subjected to fluid pressure in the chamber provided immediately above said spring chamber, and said fluid pressure chamber being connected to a line leading to a pump whereby closing pressure on the needle valve may be increased in a controlled manner.
Claim 3
Dependent Claim
36 words
A fuel injection nozzle according to claim 1, in which a clearance at least equal to the size of the opening stroke of the needle valve is provided between said needle valve and said intermediate piston.
Claim 4
Dependent Claim
28 words
A fuel injection nozzle according to claim 1, in which said intermediate piston includes a surface against which said spring is thrust in opposition to said needle valve.
Claim 5
Dependent Claim
43 words
A fuel injection nozzle according to claim 1, in which said bored body includes an internal annular shelf area, plural spring means disposed on opposite sides of said shelf area one each of said springs engaging said intermediate piston and said needle valve.
Claim 6
Dependent Claim
49 words
A fuel injection nozzle according to claim 1, in which fuel is fed from synchronously driven pumps through separate lines to the chamber in which the needle valve is operatively disposed as well as to the chamber in which the upper working surface of the intermediate piston is disposed.
Claim 7
Dependent Claim
23 words
A fuel injection nozzle according to claim 5, in which said synchronously driven pumps are associated with a fuel injection time adjusting means.
Claim 8
Dependent Claim
43 words
A fuel injection nozzle according to claim 1, in which the chamber in which said needle valve is disposed and said chamber in which the upper working surface of said intermediate piston is disposed are connected by a fuel line including valving means.
Claim 9
Dependent Claim
17 words
A fuel injection nozzle according to claim 7, in which said valving means includes pressure equalizing means.
Claim 10
Dependent Claim
37 words
A fuel injection nozzle according to claim 8, in which the pressure equalizing means is operated in accordance with the pressure prevailing in the chamber in which the upper working surface of said intermediate piston is disposed.
Claim 11
Dependent Claim
31 words
A fuel injection nozzle according to claim 7, in which the needle valve includes an annular channel that communicates with a line leading to said fuel line containing the valving means.
Claim 12
Dependent Claim
26 words
A fuel injection nozzle according to claim 7, in which said upper working surface of said intermediate piston is in fluid communication with control plunger means.
Claim 13
Dependent Claim
19 words
A fuel injection nozzle according to claim 11, in which said control plunger means cooperates with a flexible means.
Claim 14
Dependent Claim
41 words
A fuel injection nozzle according to claim 12, in which said control plunger means cooperates with throttle valve means which are in communication with lines extending to said chamber which subjects the upper working surface of said intermediate piston to pressure.
Claim 15
Dependent Claim
29 words
A fuel injection nozzle according to claim 13, in which said chamber immediately above said spring chamber is connected to said last named chamber by said control plunger means.
Claim 16
Dependent Claim
35 words
A fuel injection nozzle according to claim 1, in which the fuel injection nozzle further includes a cylinder having a transport piston and an associated working chamber arranged to be filled by check valve means.
Claim 17
Dependent Claim
27 words
A fuel injection nozzle according to claim 15, in which said working chamber is connected to a further pressure chamber that is associated with said transport piston.
Claim 18
Dependent Claim
36 words
A fuel injection nozzle according to claim 15, in which the chamber in which said needle valve is contained is connected with said spring chamber as well as to said transport piston by a suitable line.
Claim 19
Dependent Claim
19 words
A fuel injection nozzle according to claim 15, in which said transport piston is driven by a cam means.
Claim 20
Dependent Claim
33 words
A fuel injection nozzle according to claim 18, in which said transport piston cooperates with a slave piston, said slave piston being arranged to control said line leading to said needle valve chamber.
Claim 21
Dependent Claim
22 words
A fuel injection nozzle according to claim 19, in which said transport piston is rotatable about its longitudinal extent in said cylinder.
Claim 22
Dependent Claim
30 words
A fuel injection nozzle according to claim 20, in which said piston includes a chamfered terminal portion serving to control fluid flow in a line extending to said injection pump.
References Cited (Backward Citations)
US2408288A
Cited
US3610529A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-10-15 | 1983-04-16 | 1983-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-15 | 1987-04-16 | 1987-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-15 | 1991-04-16 | 1991-10-16 | $7700.00 | Window Closed / Lapsed |