Patent US4475494A successfully refreshed from Google Patents.
US4475494A
Expired / Lapsed
US
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Valve for an internal combustion engine
Assignee: MTU Aero Engines AG
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Filing: 1982-05-19
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Granted: 1984-10-09
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Expires: 2002-05-19
Abstract
Abstract A valve for an internal combustion engine having mutually cooperating sealing surfaces, both of which are cylindrical. At least the movable valve member, carrying one of the sealing surfaces, is made of ceramic material. The movable valve member may be disk-shaped or have a bulbous or drop shape. The valve member may have a hollow cylindrical body reciprocable through a hole in a wall, a circumferentially arranged port in the body being selectively closed by moving the body into the hole.
Inventors
- 👤 Werner Huther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:40
CPC Classifications
F; F01; F01L; F01L5/00; F01L5/04; F01L3/00; F01L3/02; F01L3/20; F02; F02B; F02B1/00; F02B1/02; F02B1/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
118 words
A valve for an internal combustion engine having a combustion chamber, comprising: a stationary valve member having a radially inwardly facing cylindrical sealing surface, and a valve member movable within the stationary valve member and having a radially outwardly facing annular cylindrical sealing surface, the sealing surface of the movable valve member engaging the sealing surface of the stationary valve member while the two sealing surfaces slide with respect to each other in an axial direction of the sealing surfaces, at least the movable valve member being made of ceramic material; wherein the movable valve member has an inverted tear drop shape formed with said annular cylindrical sealing surface which tapers to a point towards the combustion chamber.
Claim 2
Dependent Claim
118 words
A valve for an internal combustion engine having a combustion chamber, comprising: a stationary valve member having a radially inwardly facing cylindrical sealing surface, and a valve member movable within the stationary valve member and having a radially outwardly facing annular cylindrical sealing surface, the sealing surface of the movable valve member engaging the sealing surface of the stationary valve member while the two sealing surfaces slide with respect to each other in an axial direction of the sealing surfaces, at least the movable valve member being made of ceramic material; wherein the movable valve member has an inverted tear drop shape formed with said annular cylindrical sealing surface which tapers to a point towards the combustion chamber.
Claim 3
Dependent Claim
20 words
A valve as defined in claim 1, wherein the stationary cylindrical sealing surface terminates in an outwardly flared lead-in surface.
Claim 4
Dependent Claim
30 words
A valve as in claim 1, wherein one of the sealing surfaces is formed with annular labyrinth grooves, the grooves being arranged along an axis of the cylindrical sealing surfaces.
Claim 5
Dependent Claim
13 words
A valve as in claim 1, wherein the movable valve member is hollow.
Claim 6
Dependent Claim
17 words
A valve as in claim 1, wherein the stationary cylindrical sealing surface is formed by a tube.
Claim 7
Dependent Claim
50 words
A valve as in claim 1, wherein the stationary valve member communicates directly with the combustion space, and the movable valve member can be moved within the stationary valve member while the valve remains closed so as to vary the size of the combustion space and hence vary combustion pressure.
References Cited (Backward Citations)
US2090800A
Cited
US4359022A
Cited
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 |