Patent US3620647A successfully refreshed from Google Patents.
US3620647A
Expired / Lapsed
US
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Fuel injection system for internal combustion engines
Assignee: Robert Bosch GmbH
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Filing: 1970-08-12
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Granted: 1971-11-16
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Expires: 1990-08-12
Abstract
Abstract A fuel injection system having a reciprocating control member driven in synchronism with the injection pump for opening a fuel and interrupting the injection process. The control member, during its return stroke, drives the fluid through a controllable throttle channel to create a fluid abutment,'''' i.e., it does not return to the initial position. A second bypass is provided subject to control by the control member as well as by a slide valve; also synchronous with the main pump, the characteristic feature being the coordination of the control member with the slide valve in dependence on the variable position of the fluid abutment.
Inventors
- 👤 Gerald Hofer
- 👤 Heinz Nothdurft
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:30
CPC Classifications
F; F02; F02M; F02M41/00; F02M41/08; F02M41/10; F02M41/12; F02M41/123; F02M41/125; F02M41/127; F04; F04B; F04B49/00; F04B49/22; F04B49/225; F04B7/00; F04B7/04; F04B7/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
331 words
A fuel injection system for internal combustion engines having a variable rate of fuel supply in dependence on the r.p.m. comprising, a fuel injection pump having a cylinder and a pump piston in said cylinder delimiting therewith a work chamber, a first bypass for said work chamber, a reciprocable control member for interrupting the delivery of said pump at least at maximum r.p.m. by opening up said first bypass during the pressure stroke of the said pump piston, an auxiliary pump for operation in synchronism with said injection pump and supplying pressure liquid to said control member during the pressure stroke thereof, means for exerting a return force on said control member, a stop for limiting the return stroke of said control member and defining a fixed initial position therefor, a throttle channel having a controllable restriction therein and connected to receive a portion of the liquid displaced during the return stroke of said control member, thereby to decelerate said return stroke, whereby said control member upon the attaining of a predetermined r.p.m. and at a certain value of the crosssectional area of said restriction is subjected to a fluid abutment and does not return to said initial position, a second bypass connected with said work chamber and means on said control member for controlling said second bypass, a slide valve driven in synchronism with said injection pump and said auxiliary pump for controlling said second bypass, characterized by a dimensioning of said system, whereby said second bypass (33) is opened up by said control member (14) before said first bypass (16b), and said second bypass (33) is closed by said slive valve (2) before the opening up thereof in response to said control member (14) when no fluid abutment is present and in the presence of a fluid abutment is opened up by said control member (14) at an increasingly earlier time relative to the closing thereof by said slide valve (2) as the level of said fluid abutment rises.
Claim 2
Dependent Claim
331 words
A fuel injection system for internal combustion engines having a variable rate of fuel supply in dependence on the r.p.m. comprising, a fuel injection pump having a cylinder and a pump piston in said cylinder delimiting therewith a work chamber, a first bypass for said work chamber, a reciprocable control member for interrupting the delivery of said pump at least at maximum r.p.m. by opening up said first bypass during the pressure stroke of the said pump piston, an auxiliary pump for operation in synchronism with said injection pump and supplying pressure liquid to said control member during the pressure stroke thereof, means for exerting a return force on said control member, a stop for limiting the return stroke of said control member and defining a fixed initial position therefor, a throttle channel having a controllable restriction therein and connected to receive a portion of the liquid displaced during the return stroke of said control member, thereby to decelerate said return stroke, whereby said control member upon the attaining of a predetermined r.p.m. and at a certain value of the crosssectional area of said restriction is subjected to a fluid abutment and does not return to said initial position, a second bypass connected with said work chamber and means on said control member for controlling said second bypass, a slide valve driven in synchronism with said injection pump and said auxiliary pump for controlling said second bypass, characterized by a dimensioning of said system, whereby said second bypass (33) is opened up by said control member (14) before said first bypass (16b), and said second bypass (33) is closed by said slive valve (2) before the opening up thereof in response to said control member (14) when no fluid abutment is present and in the presence of a fluid abutment is opened up by said control member (14) at an increasingly earlier time relative to the closing thereof by said slide valve (2) as the level of said fluid abutment rises.
Claim 3
Dependent Claim
29 words
A fuel injection system according to claim 1, having a fuel line for connecting to an engine and in which a release space is provided in said fuel line.
Claim 4
Dependent Claim
19 words
A fuel injection system according to claim 1, in which said injection pump piston (2) forms said slide valve.
Claim 5
Dependent Claim
22 words
A fuel injection system according to claim 1, in which the pump piston (18) of said auxiliary pump forms said slide valve.
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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |