Patent US4901876A successfully refreshed from Google Patents.
Patent US5503124A successfully refreshed from Google Patents.
US5503124A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary valve with seal supporting tongue
Assignee: AE Bishop Research Pty Ltd
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Filing: 1993-11-03
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Granted: 1996-04-02
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Expires: 2013-11-03
Abstract
Abstract A rotary valve (10) for an internal combustion engine, of the hollow cylindrical type, having one or more openings (14) arranged to pass periodically over a window in the cylinder head bore, characterized in that the valve (10) also incorporates at least one tongue (34) projecting from the axially central point of the leading edge of at least one of the openings (14), the external surface of the tongue (34) having the same profile as the outer cylindrical surface (35) of the valve (10), the tongue (34) extending from the leading edge (24) of the opening (14) to an extent sufficient to support the center of an axially extending seal during that period when the leading edge (24) of the opening (14) crosses such seal.
Inventors
- 👤 Anthony B. Wallis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:08
CPC Classifications
F; F01; F01L; F01L7/00; F01L7/16; F01L7/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
159 words
A rotary valve for an internal combustion engine comprising a hollow cylindrical valve, said valve having one or more ports terminating as openings in its periphery, said valve being supported for rotation in a cylinder head bore in which said valve rotates with a predetermined small clearance fit, said openings periodically passing over a window in said cylinder head bore, said window communicating with a combustion chamber, said valve being sealed against leakage of gas from the combustion chamber in a circumferential direction by means of axially extending seals at least one circumferentially on each side of said window, characterized in that the valve also incorporates at least one tongue projecting from the leading edge of at least one of the openings, the tongue extending from the edge of an opening to an extent sufficient to support radially one or more of the axially extending seals during that period when the leading edge of the opening crosses such seals.
Claim 2
Dependent Claim
159 words
A rotary valve for an internal combustion engine comprising a hollow cylindrical valve, said valve having one or more ports terminating as openings in its periphery, said valve being supported for rotation in a cylinder head bore in which said valve rotates with a predetermined small clearance fit, said openings periodically passing over a window in said cylinder head bore, said window communicating with a combustion chamber, said valve being sealed against leakage of gas from the combustion chamber in a circumferential direction by means of axially extending seals at least one circumferentially on each side of said window, characterized in that the valve also incorporates at least one tongue projecting from the leading edge of at least one of the openings, the tongue extending from the edge of an opening to an extent sufficient to support radially one or more of the axially extending seals during that period when the leading edge of the opening crosses such seals.
Claim 3
Dependent Claim
28 words
A rotary valve as claimed in claim 1 wherein one tongue projects from an axially central point on the leading edge of at least one of the openings.
Claim 4
Dependent Claim
31 words
A rotary valve as claimed in claim 1 wherein the external surface of at least one said tongue has the same diametral profile as the outer cylindrical periphery of said valve.
Claim 5
Dependent Claim
79 words
A rotary valve as claimed in claim 1 wherein at least one said tongue extends from the leading edge of an opening to such an extent as to subtend at the rotational axis of the valve an angle greater than the angle subtended by the width of the radially supported axial seal but less than the angle subtended by the distance between the circumferentially outermost face of the radially supported axial seal and an adjacent face of the window.
Claim 6
Dependent Claim
23 words
A rotary valve as claimed in claim 1 wherein at least one said tongue extends from the leading edge of the exhaust opening.
References Cited (Backward Citations)
FR1041691A
Cited
US3871340A
Cited
US4019487A
Cited
EP0112069A1
Cited
US4852532A
Cited
US5074265A
Cited
US5154147A
Cited
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Cited
US5152259A
Cited
US5255645A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-04-02 | 1999-10-02 | 2000-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-04-02 | 2003-10-02 | 2004-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-04-02 | 2007-10-02 | 2008-04-02 | $7700.00 | Window Closed / Lapsed |