US3868940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inlet port for internal combustion engines, in particular for diesel engines
Assignee: Individual
•
Filing: 1973-04-23
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Granted: 1975-03-04
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Expires: 1993-04-23
Abstract
Abstract An inlet port for internal combustion engines for the production of a rotational flow in the cylinder, comprising a spiral-shaped annular chamber arranged above the intake valve, wound around the valve stem and sloping off towards the valve seat, a rib protruding into the spiral-shaped annular chamber and subdividing the same to from two part currents of the combustion air admitted through the feed duct of the inlet port, said rib consisting of a portion leading from the port wall to the valve guide bearing and of an adjacent portion extending from the valve guide bearing in the direction of the feed duct and essentially of a vane-like shape.
Inventors
- 👤 Karl Kirchweger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:39
CPC Classifications
F; F01; F01L; F01L3/00; F01L3/06; F02; F02B; F02B31/00; F02B31/02; F02B31/04; F02B31/042; F02B31/06; F02B33/00; F02B33/02; F02F; F02F1/00; F02F1/24; F02F1/42; F02F1/4228; F02B3/00; F02B3/06; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
194 words
An internal combustion engine comprising: at least one cylinder; an inlet duct leading to the cylinder and having a circular aperture open to the cylinder; an intake valve with a valve stem located within the inlet duct, said intake valve being eccentrically arranged in relation to the cylinder; a valve guide bearing encompassing the valve stem; said inlet duct including a feed duct for the admission of air for combustion and an adjoining annular chamber wound in a spiral-shape around the valve stem sloping off towards the circular aperture of said inlet duct; a partition in said annular chamber extending from a section of the inner boundary wall of the inlet duct and lying in a plane containing the axis of the valve stem and dividing said annular chamber into two compartments; and an airfoil-shaped member extending from said valve guide bearing in an upstream direction of said feed duct and dividing the feed duct into two separate branches, each of said branches being connected with one of the compartments of said annular chamber and said airfoil-shaped member being curved in the direction of the winding of the spiral-shaped portion of said inlet duct.
Claim 2
Dependent Claim
194 words
An internal combustion engine comprising: at least one cylinder; an inlet duct leading to the cylinder and having a circular aperture open to the cylinder; an intake valve with a valve stem located within the inlet duct, said intake valve being eccentrically arranged in relation to the cylinder; a valve guide bearing encompassing the valve stem; said inlet duct including a feed duct for the admission of air for combustion and an adjoining annular chamber wound in a spiral-shape around the valve stem sloping off towards the circular aperture of said inlet duct; a partition in said annular chamber extending from a section of the inner boundary wall of the inlet duct and lying in a plane containing the axis of the valve stem and dividing said annular chamber into two compartments; and an airfoil-shaped member extending from said valve guide bearing in an upstream direction of said feed duct and dividing the feed duct into two separate branches, each of said branches being connected with one of the compartments of said annular chamber and said airfoil-shaped member being curved in the direction of the winding of the spiral-shaped portion of said inlet duct.
Claim 3
Dependent Claim
26 words
An internal combustion engine as claimed in claim 1, wherein said partition and said airfoil-shaped member are integrally casted with the wall of said inlet duct.
Claim 4
Dependent Claim
30 words
An internal combustion engine as claimed in claim 1, wherein said airfoil-shaped member is supported by said valve guide bearing and rotatable in relation to the axis of said valve.
Claim 5
Dependent Claim
40 words
An internal combustion engine as claimed in claim 3, wherein the airfoil-shaped member is formed by a sheet metal blade attached to a tubular sleeve rotatably mounted on said valve guide bearing, in an approximately tangential relation to said bearing.
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) | 1978-03-03 | 1978-09-02 | 1979-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-03 | 1982-09-02 | 1983-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-03 | 1986-09-02 | 1987-03-04 | $7700.00 | Window Closed / Lapsed |