US4901703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crankcase ventilation system for a reciprocating internal combustion engine
Assignee: Bentley Motors Ltd
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Filing: 1988-05-16
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Granted: 1990-02-20
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Expires: 2008-05-16
Abstract
Abstract In a reciprocating internal combustion engine, which may be turbocharged or normally aspirated, the inlet manifold is connected by a duct 10 to a bypass 9 which in turn connects the crankcase 8 to a point upstream of the throttle. Non-return valves 11 and 12 are disposed in the duct 10 and bypass 9 respectively. An adjustable diaphragm valve 14, whose operation is controlled by the pressure in a pressure sensor line 15 leading to crankcase 8, is disposed in a bypass 13 to the valve 12. The arrangement operates to prevent crankcase overpressure under normal operating conditions of the engine.
Inventors
- 👤 David T. Humphries
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:37
CPC Classifications
F; F01; F01M; F01M13/00; F01M13/02; F01M13/021; F01M13/022; F01M13/025
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
100 words
A reciprocating internal combustion engine comprising an air input leading to the engine through an air filter, a turbocompressor, an air-meter, throttle and inlet manifold, said engine including means for venting the engine crankcase to the air input after the air filter, means for connecting the air input to the means for venting, valve means for controlling the air flow through the means for venting and the means for connecting to control the pressure in the crankcase below atmospheric pressure within certain limits, in response to crankcase depression, said valve means comprising a non-return valve in the means for connecting.
Claim 2
Dependent Claim
100 words
A reciprocating internal combustion engine comprising an air input leading to the engine through an air filter, a turbocompressor, an air-meter, throttle and inlet manifold, said engine including means for venting the engine crankcase to the air input after the air filter, means for connecting the air input to the means for venting, valve means for controlling the air flow through the means for venting and the means for connecting to control the pressure in the crankcase below atmospheric pressure within certain limits, in response to crankcase depression, said valve means comprising a non-return valve in the means for connecting.
Claim 3
Dependent Claim
23 words
A reciprocating internal combustion engine as claimed in claim 1, in which the valve in the means for connecting comprises a non-return valve.
Claim 4
Dependent Claim
39 words
A reciprocating internal combustion engine as claimed in claim 1, in which the valve means for controlling air flow through the means for venting and the means for connecting comprises a second, non-return valve in the means for venting.
Claim 5
Dependent Claim
35 words
A reciprocating internal combustion engine as claimed in claim 1, in which the means for venting connects the crankcase of the engine to the air input to the engine just downstream of the air filter.
Claim 6
Dependent Claim
32 words
A reciprocating internal combustion engine as claimed in claim 1, in which the means for connecting comprises a duct connecting the air input at the inlet manifold to the means for venting.
Claim 7
Dependent Claim
29 words
A reciprocating internal combustion engine as claimed in claim 5, in which a further valve is disposed in a bypass around the non-return valve in the means for venting.
Claim 8
Dependent Claim
19 words
A reciprocating internal combustion engine as claimed in claim 6, in which the further valve is a diaphragm valve.
Claim 9
Dependent Claim
57 words
A reciprocating internal combustion engine as claimed in claim 6, in which control means are provided for the further valve for controlling the valve in response to the pressure in the crankcase such that when the pressure falls below a certain value the valve opens to permit air flow from the air input thus limiting crankcase depression.
Claim 10
Dependent Claim
20 words
A reciprocating internal combustion engine as claimed in claim 2 or 3, in which the valve means comprises a sensor.
References Cited (Backward Citations)
US2463828A
Cited
US3175546A
Cited
FR2283315A1
Cited
JPS5627016A
Cited
JPS58126412A
Cited
JPS6081416A
Cited
DE3604090A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-19 | 1993-08-21 | 1994-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-19 | 1997-08-21 | 1998-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-19 | 2001-08-21 | 2002-02-20 | $7700.00 | Window Closed / Lapsed |