US3640261A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engines
Assignee: Individual
•
Filing: 1970-05-25
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Granted: 1972-02-08
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Expires: 1990-05-25
Abstract
Abstract An internal combustion engine including a cylinder head having a passage positioned therein adapted to communicate with a combustion chamber and adapted to carry either a fuel-air mixture or products of combustion. The passage has first and second portions positioned at an angle to one another that are formed by a pair of retractable dies during a casting process thereby leaving a sharp discontinuity. A valve seat insert is positioned in one portion of the passage and it includes a lip having an inner surface which curves or tapers smoothly toward this discontinuity to improve the gaseous flow characteristics of the passage.
Inventors
- 👤 Geoffrey Ernest Josey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:58
CPC Classifications
F; F02; F02F; F02F1/00; F02F1/24; F02F1/42; F02F1/4235; F02F1/4264; F02F2001/244; F02F2001/247; F02F2200/00; F02F2200/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
160 words
An internal combustion engine comprising a cylinder head having a passage positioned therein, said passage having a first portion, and a second portion positioned at an angle with respect to said first portion and formed by a pair of retractable dies whereby the wall of the passage has a sharp discontinuity formed during the casting process at the intersection of said first portion and said second portion, said second portion of said passage having a flat or planar wall surface adjoining the discontinuity, one end of said first portion being adapted to communicate with a combustion chamber, a valve seat insert positioned in said end of said first portion, said valve seat insert including a lip extending into said first portion to said sharp discontinuity at the intersection of said first and second portions of said induction passage, said lip including an inner surface that tapers curves smoothly toward the discontinuity to improve the gaseous flow characteristics of the passage.
Claim 2
Dependent Claim
160 words
An internal combustion engine comprising a cylinder head having a passage positioned therein, said passage having a first portion, and a second portion positioned at an angle with respect to said first portion and formed by a pair of retractable dies whereby the wall of the passage has a sharp discontinuity formed during the casting process at the intersection of said first portion and said second portion, said second portion of said passage having a flat or planar wall surface adjoining the discontinuity, one end of said first portion being adapted to communicate with a combustion chamber, a valve seat insert positioned in said end of said first portion, said valve seat insert including a lip extending into said first portion to said sharp discontinuity at the intersection of said first and second portions of said induction passage, said lip including an inner surface that tapers curves smoothly toward the discontinuity to improve the gaseous flow characteristics of the passage.
Claim 3
Dependent Claim
39 words
The combination of claim 1 in which said valve seat insert comprises a ring having a beveled surface adapted to receive the seating face of a valve, the inner surface of said lip tapering smoothly into said beveled surface.
Claim 4
Dependent Claim
18 words
The combination of claim 2 in which said lip extends for a substantial arcuate portion of said ring.
Claim 5
Dependent Claim
29 words
The combination of claim 3 in which the surface of said lip opposite said ring forms a continuation of the wall of said second portion of said induction passage.
Claim 6
Dependent Claim
77 words
The cOmbination of claim 1 in which said valve seat insert comprises a ring having a beveled surface adapted to receive the seating face of a valve, the inner surface of said lip tapering smoothly into said beveled surface, said lip extending for a substantial arcuate portion of said ring and the surface of said lip opposite said ring lies in the plane of said flat or planar wall surface of said second portion of said passage.
Claim 7
Dependent Claim
223 words
An internal combustion engine comprising a cylinder head having a passage positioned therein, said passage having a first portion, and a second portion positioned at an angle with respect to said first portion and formed by a pair of retractable dies whereby the wall of the passage has a sharp discontinuity formed during the casting process at the intersection of said first portion and said second portion, said second portion of said passage having a flat or planar wall surface adjoining the discontinuity, one end of said first portion being adapted to communicate with a combustion chamber, a valve seat insert positioned in said end of said first portion, said valve seat insert including a ring having a beveled surface adapted to receive the seating face of a valve, a lip extending for a substantial portion of said ring and extending into said first portion to said sharp discontinuity at the intersection of said first and second portions of said induction passage, said lip including an inner toroidal-type surface that extends into and meets said beveled surface of said ring and tapers curves smoothly toward the discontinuity to improve the gaseous flow characteristics of the passage, said surface of said lip opposite said ring lying in a plane formed by said flat or planar wall surface of said second portion of said passage.
Claim 8
Dependent Claim
223 words
An internal combustion engine comprising a cylinder head having a passage positioned therein, said passage having a first portion, and a second portion positioned at an angle with respect to said first portion and formed by a pair of retractable dies whereby the wall of the passage has a sharp discontinuity formed during the casting process at the intersection of said first portion and said second portion, said second portion of said passage having a flat or planar wall surface adjoining the discontinuity, one end of said first portion being adapted to communicate with a combustion chamber, a valve seat insert positioned in said end of said first portion, said valve seat insert including a ring having a beveled surface adapted to receive the seating face of a valve, a lip extending for a substantial portion of said ring and extending into said first portion to said sharp discontinuity at the intersection of said first and second portions of said induction passage, said lip including an inner toroidal-type surface that extends into and meets said beveled surface of said ring and tapers curves smoothly toward the discontinuity to improve the gaseous flow characteristics of the passage, said surface of said lip opposite said ring lying in a plane formed by said flat or planar wall surface of said second portion of said passage.
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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |