US4158353A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Positive crank case ventilation valve and internal combustion engine including the same
Assignee: Caterpillar Industrial Inc
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Filing: 1977-10-21
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Granted: 1979-06-19
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Expires: 1997-10-21
Abstract
Abstract An internal combustion engine including an air intake and a crank case, a positive crank case ventilation valve having a valve body, a cavity within the valve body, a first valve seat within the cavity, a second valve seat within the cavity and smaller than the first valve seat, a valve member within the cavity and configured to substantially close the cavity to the ambient and yet be movable therein to a position seated against both the valve seat and to a position spaced from the seond valve seat, a passage terminating at the second valve seat, a port terminating in the cavity between the first and second valve seats, a conduit extending between the passage and the air intake of the engine, and a conduit extending between the port and the crank case. The difference in areas of the two valve seats permits crank case pressure to be closely controlled.
Inventors
- 👤 William E. Darnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:33
CPC Classifications
F; F01; F01M; F01M13/00; F01M13/02; F01M13/021; F01M13/022; F01M13/023
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
132 words
An internal combustion engine including an air intake and a crank case, a positive crank case ventilation valve having a valve body, a cavity within said body, a first valve seat within said cavity, a second valve seat within said cavity and smaller than said first valve seat, a valve member within said cavity and sized to substantially close said cavity to the ambient and yet be movable therein to a position seated against both said valve seats, and to a position spaced from said valve seats, a passage terminating at said second valve seat, and a port terminating in said cavity between said first and second valve seats; means establishing fluid communication between said passage and said air intake; and means establishing fluid communication between said port and said crank case.
Claim 2
Dependent Claim
132 words
An internal combustion engine including an air intake and a crank case, a positive crank case ventilation valve having a valve body, a cavity within said body, a first valve seat within said cavity, a second valve seat within said cavity and smaller than said first valve seat, a valve member within said cavity and sized to substantially close said cavity to the ambient and yet be movable therein to a position seated against both said valve seats, and to a position spaced from said valve seats, a passage terminating at said second valve seat, and a port terminating in said cavity between said first and second valve seats; means establishing fluid communication between said passage and said air intake; and means establishing fluid communication between said port and said crank case.
Claim 3
Dependent Claim
28 words
The internal combustion engine of claim 1 wherein said valve member is a substantially planar disc and said first and second valve seats lie in a common plane.
Claim 4
Dependent Claim
34 words
The internal combustion engine of claim 2 wherein said cavity comprises an annular space about said second valve seat and said first valve seat comprises an annular shoulder about the periphery of said cavity.
Claim 5
Dependent Claim
38 words
The internal combustion engine of claim 3 wherein a cover is received in said cavity for closing the same, and further including a vent extending through said cover, and means for securing said cover to said valve body.
Claim 6
Dependent Claim
175 words
A positive crank case ventilation valve for use in combination with an internal combustion engine including an air intake and a crank case, said valve comprising a valve body, a cavity in said valve body, a passage extending through said valve body into said cavity centrally thereof, said passage being adapted to be connected to the air intake of an internal combustion engine, a boss within said cavity and about said passage and having an end defining a valve seat, a shoulder extending about the periphery of said cavity and spaced from said boss and defining a second valve seat, and a disc-like valve member within said cavity and movable therein between positions simultaneously sealing against and spaced from both said valve seats, a port in said body in fluid communication with said cavity between said shoulder and said boss and adapted to be connected to the crank case of an internal combustion engine; and means establishing fluid communication between the exterior of said valve body and said valve member oppositely of said valve seats.
Claim 7
Dependent Claim
175 words
A positive crank case ventilation valve for use in combination with an internal combustion engine including an air intake and a crank case, said valve comprising a valve body, a cavity in said valve body, a passage extending through said valve body into said cavity centrally thereof, said passage being adapted to be connected to the air intake of an internal combustion engine, a boss within said cavity and about said passage and having an end defining a valve seat, a shoulder extending about the periphery of said cavity and spaced from said boss and defining a second valve seat, and a disc-like valve member within said cavity and movable therein between positions simultaneously sealing against and spaced from both said valve seats, a port in said body in fluid communication with said cavity between said shoulder and said boss and adapted to be connected to the crank case of an internal combustion engine; and means establishing fluid communication between the exterior of said valve body and said valve member oppositely of said valve seats.
Claim 8
Dependent Claim
33 words
The positive crank case ventilation valve of claim 5 wherein said last-named means comprises a cover including a vent secured to said valve body oppositely of said boss to substantially close said cavity.
Claim 9
Dependent Claim
47 words
The positive crank case ventilation valve of claim 5 including an additional peripheral shoulder in said valve body and spaced from said first shoulder, a cover disposed on said additional shoulder, means for securing said cover against said additional shoulder, and a vent extending through said cover.
Claim 10
Dependent Claim
26 words
The positive crank case ventilation valve of claim 5 wherein at least one of said valve seats is at least partially defined by an elastomeric member.
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) | 1982-06-18 | 1982-12-18 | 1983-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-18 | 1986-12-18 | 1987-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-18 | 1990-12-18 | 1991-06-19 | $7700.00 | Window Closed / Lapsed |