US4359994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection pump for internal combustion engines
Assignee: Robert Bosch GmbH
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Filing: 1980-05-05
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Granted: 1982-11-23
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Expires: 2000-05-05
Abstract
Abstract The invention relates to a fuel injection pump for internal combustion engines having an injection onset adjuster with which the injection onset is adjustable toward "early", for instance in accordance with temperature. In accordance with the invention this adjustment toward "early" is made possible especially in pumps having a load-dependent injection onset adjustment, which preferably exhibit a shift toward "late" up to full load.
Inventors
- 👤 Gerald Hofer
- 👤 Karl Konrath
- 👤 Helmut Laufer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:10
CPC Classifications
F; F02; F02D; F02D1/00; F02D1/16; F02D1/18; F02D1/183
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
164 words
A fuel injection pump for internal combustion engines having an rpm governor with an adjustment member actuated in accordance with load and rpm and further including a supply pump, the pressure of which is exerted upon an injecting adjustment piston having a high pressure side for the purpose of adjusting fuel injection onset, wherein said pressure is controllable on the one hand via a pressure control valve in proportion to rpm and on the other hand via a first discharge valve (17, 18) actuated in accordance with engine characteristics by permitting a discharge of partial fuel quantities, characterized in that said adjustment member at least indirectly controls a discharge opening of a diversion channel leading from said high pressure side of said adjustment piston to a low pressure side and being opened substantially at full load and further including a second discharge valve which is provided in said diversion channel downstream of said discharge opening which is controllable independent of any further engine characteristics.
Claim 2
Dependent Claim
164 words
A fuel injection pump for internal combustion engines having an rpm governor with an adjustment member actuated in accordance with load and rpm and further including a supply pump, the pressure of which is exerted upon an injecting adjustment piston having a high pressure side for the purpose of adjusting fuel injection onset, wherein said pressure is controllable on the one hand via a pressure control valve in proportion to rpm and on the other hand via a first discharge valve (17, 18) actuated in accordance with engine characteristics by permitting a discharge of partial fuel quantities, characterized in that said adjustment member at least indirectly controls a discharge opening of a diversion channel leading from said high pressure side of said adjustment piston to a low pressure side and being opened substantially at full load and further including a second discharge valve which is provided in said diversion channel downstream of said discharge opening which is controllable independent of any further engine characteristics.
Claim 3
Dependent Claim
34 words
A fuel injection pump as defined by claim 1, characterized in that said discharge valve is embodied as a pressure limitation valve, which is operable by a servomotor functioning in accordance with engine characteristics.
Claim 4
Dependent Claim
47 words
A fuel injection pump as defined by claim 1, characterized in that said pressure control valve is disposed in a chamber, said pressure control valve further including a control slide loaded by a spring and said chamber of said pressure control valve communicates with said diversion channel.
Claim 5
Dependent Claim
25 words
A fuel injection pump as defined by claim 3, characterized in that said control slide of said pressure control valve includes a longitudinal throttle bore.
Claim 6
Dependent Claim
32 words
A fuel injection pump as defined in claim 3, characterized in that said control slide opens a first discharge opening and, after covering an appropriate stroke distance, opens a second discharge opening.
Claim 7
Dependent Claim
41 words
A fuel injection pump as defined by claims 2, 3, 4, 5 or 7 characterized in that said diversion channel is in communication with an overflow valve, said overflow valve arranged to be connected at predetermined intervals with said diversion channel.
Claim 8
Dependent Claim
32 words
A fuel injection pump as defined by claim 4, characterized in that said control slide opens a first discharge opening and, after covering an appropriate stroke distance, opens a second discharge opening.
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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) | 1985-11-22 | 1986-05-24 | 1986-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-22 | 1990-05-24 | 1990-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-22 | 1994-05-24 | 1994-11-23 | $7700.00 | Window Closed / Lapsed |