US4896633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve control of internal combustion engines by means of a rotary piston pump with unequal pumping output
Assignee: Interatom Internationale Atomreaktorbau GmbH
•
Filing: 1988-08-26
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Granted: 1990-01-30
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Expires: 2008-08-26
Abstract
Abstract A rotary piston pump assembly includes a rotary piston pump having first, second and third sectors. Pistons successively pass through the first, the second and the third sectors during one rotation. The pump has a pump output equal to zero during passage of the pistons through the first sector.
Inventors
- 👤 Ewald Junghans
- 👤 Gabriel Tittizer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:01
CPC Classifications
F; F01; F01L; F01L9/00; F01L9/10; F04; F04B; F04B49/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
88 words
Rotary piston pump assembly, comprising a rotary piston pump having a housing with first, second and third sectors, a pump body with a plurality of radially displaceable pistons successively passing through said first, said second and said third sectors during one rotation, each two of said pistons enclosing a space therebetween forming an independent pumping chamber, and inlet and outlet means communicating with said pumping chambers, each of said pumping chambers having a pump output equal to zero during passage of said enclosing pistons through said first sector.
Claim 2
Dependent Claim
88 words
Rotary piston pump assembly, comprising a rotary piston pump having a housing with first, second and third sectors, a pump body with a plurality of radially displaceable pistons successively passing through said first, said second and said third sectors during one rotation, each two of said pistons enclosing a space therebetween forming an independent pumping chamber, and inlet and outlet means communicating with said pumping chambers, each of said pumping chambers having a pump output equal to zero during passage of said enclosing pistons through said first sector.
Claim 3
Dependent Claim
28 words
Rotary piston pump assembly according to claim 1, including means connected to said rotary piston pump for controlling valves of an internal combustion engine with the pump output.
Claim 4
Dependent Claim
42 words
Rotary piston pump assembly according to claim 2, wherein said first sector encompasses a portion of one revolution of one of said pistons equal to one revolution of the crankshaft of the internal combustion engine, during which the controlled valves are closed.
Claim 5
Dependent Claim
44 words
Rotary piston pump assembly according to claim 1, wherein said pump functions as a pressure pump during the passage of said pistons through said second sector and said pump functions as a suction pump during the passage of said pistons through said third sector.
Claim 6
Dependent Claim
26 words
Rotary piston pump assembly according to claim 2, wherein the number of said pumping chambers is equal to the number of said valves to be controlled.
Claim 7
Dependent Claim
16 words
Rotary piston pump assembly according to claim 1, wherein said pump is a roller cell pump.
References Cited (Backward Citations)
US3038412A
Cited
US2827857A
Cited
FR1577994A
Cited
DE1962323A1
Cited
GB1291719A
Cited
US3734654A
Cited
US3776203A
Cited
US3791354A
Cited
US4183723A
Cited
US4206728A
Cited
FR2480853A1
Cited
FR2567613A1
Cited
US4659296A
Cited
EP0191376A1
Cited
SU1346842A1
Cited
US4802830A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-29 | 1993-07-31 | 1994-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-29 | 1997-07-31 | 1998-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-29 | 2001-07-31 | 2002-01-30 | $7700.00 | Window Closed / Lapsed |