US4475521A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection pump for internal combustion engines
Assignee: Robert Bosch GmbH
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Filing: 1982-08-23
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Granted: 1984-10-09
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Expires: 2002-08-23
Abstract
Abstract A fuel injection pump for internal combustion engines is proposed which has a hydraulic injection instant adjuster, which is exposed to an rpm-dependent pressure established with the aid of a pressure control valve. The control of the pressure control valve is effected by means of varying the control pressure acting upon it. This is accomplished with the aid of a pressure valve, which has a slide exposed to a force variable in accordance with altitude, and the control pressure of the pressure control valve can be modified by means of this slide.
Inventors
- 👤 Max Greiner
- 👤 Karl Konrath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:33
CPC Classifications
F; F02; F02M; F02M59/00; F02M59/44; F02M59/447; F02D; F02D1/00; F02D1/02; F02D1/08; F02D1/12; F02D1/122; F02D1/127; F02D1/16; F02D1/18; F02D1/183; F02M26/00; F02M26/13; F02M26/40; F02M26/52; F02M26/59; F02M26/62; F02M2026/001; F02M2026/002
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
231 words
A fuel injection pump for internal combustion engines comprising a fuel supply pump driven in synchronism with the fuel injection pump, a pressure side of said fuel supply pump arranged to communicate with a work chamber ahead of an adjusting piston, said adjusting piston serves to adjust the injection onset and is exposed to a restoring force in a chamber connected via a discharge line to a discharge opening, said discharge opening being controlled by a control piston of a pressure control valve including a relief chamber in order to generate an rpm-dependent control pressure at the pressure side of said pressure control valve, said control piston being exposed to a restoring force and further arranged to enclose on one side a control pressure chamber, said control pressure chamber being in communication with said pressure side of said fuel supply pump via a throttle connection and with said relief chamber via a relief line connected with a pressure valve including a valve closing member which is exposed to a valve spring, the initial stress of said valve spring being variable by means of a support point which is displaceable in accordance with air pressure, in which said valve closing member of said pressure valve comprises a slide means, and said relief line further includes a pressure limitation valve which is disposed between a pressure maintenance valve and said pressure control valve.
Claim 2
Dependent Claim
231 words
A fuel injection pump for internal combustion engines comprising a fuel supply pump driven in synchronism with the fuel injection pump, a pressure side of said fuel supply pump arranged to communicate with a work chamber ahead of an adjusting piston, said adjusting piston serves to adjust the injection onset and is exposed to a restoring force in a chamber connected via a discharge line to a discharge opening, said discharge opening being controlled by a control piston of a pressure control valve including a relief chamber in order to generate an rpm-dependent control pressure at the pressure side of said pressure control valve, said control piston being exposed to a restoring force and further arranged to enclose on one side a control pressure chamber, said control pressure chamber being in communication with said pressure side of said fuel supply pump via a throttle connection and with said relief chamber via a relief line connected with a pressure valve including a valve closing member which is exposed to a valve spring, the initial stress of said valve spring being variable by means of a support point which is displaceable in accordance with air pressure, in which said valve closing member of said pressure valve comprises a slide means, and said relief line further includes a pressure limitation valve which is disposed between a pressure maintenance valve and said pressure control valve.
Claim 3
Dependent Claim
232 words
A fuel injection pump for internal combustion engines comprising a fuel supply pump driven in synchronism with the fuel injection pump, a pressure side of said fuel supply pump arranged to communicate with a work chamber ahead of an adjusting piston, said adjusting piston serves to adjust the injection onset and is exposed to a restoring force connected via a discharge line to a discharge opening, said discharge opening being controlled by a control piston of a pressure control valve including a relief chamber in order to generate an rpm-dependent control pressure at the pressure side of said pressure control valve, said control piston being exposed to a restoring force and further arranged to enclose on one side a control pressure chamber, said control pressure chamber being in communication with said pressure side of said fuel supply pump via a throttle connection and with said relief chamber via a relief line connected with a pressure valve including a valve closing member which is exposed to a valve spring, the initial stress of said valve spring being variable by means of a support point which is displaceable in accordance with air pressure, a temperature-controlled pressure maintenance valve is additionally disposed in said relief line in series with said pressure valve, and said relief line further includes a pressure limitation valve which is disposed between said pressure maintenance valve and said pressure control valve.
Claim 4
Dependent Claim
232 words
A fuel injection pump for internal combustion engines comprising a fuel supply pump driven in synchronism with the fuel injection pump, a pressure side of said fuel supply pump arranged to communicate with a work chamber ahead of an adjusting piston, said adjusting piston serves to adjust the injection onset and is exposed to a restoring force connected via a discharge line to a discharge opening, said discharge opening being controlled by a control piston of a pressure control valve including a relief chamber in order to generate an rpm-dependent control pressure at the pressure side of said pressure control valve, said control piston being exposed to a restoring force and further arranged to enclose on one side a control pressure chamber, said control pressure chamber being in communication with said pressure side of said fuel supply pump via a throttle connection and with said relief chamber via a relief line connected with a pressure valve including a valve closing member which is exposed to a valve spring, the initial stress of said valve spring being variable by means of a support point which is displaceable in accordance with air pressure, a temperature-controlled pressure maintenance valve is additionally disposed in said relief line in series with said pressure valve, and said relief line further includes a pressure limitation valve which is disposed between said pressure maintenance valve and said pressure control valve.
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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) | 1987-10-09 | 1988-04-09 | 1988-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-09 | 1992-04-09 | 1992-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-09 | 1996-04-09 | 1996-10-09 | $7700.00 | Window Closed / Lapsed |