Patent US3557766A successfully refreshed from Google Patents.
US3557766A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combustion engines
Assignee: LEANDER ENGINEERING Co Ltd
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Filing: 1968-06-07
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Granted: 1971-01-26
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Expires: 1988-06-07
Abstract
Abstract A cylinder head for an internal combustion engine comprising a boundary wall, preferably dished defining a combustion chamber at one end of the cylinder, the normal shape of the wall defining a chamber of insufficient size to accommodate movement of the poppet valve heads controlling the inlet and outlet ports, and the wall being provided with recesses in which the valve seats are located.
Inventors
- 👤 Frank H Stark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:29
CPC Classifications
F; F02; F02F; F02F1/00; F02F1/24; F02F1/26; F02F1/36; F02F1/38; F01; F01L; F01L1/00; F01L1/02; F01L1/04; F01L1/047; F01L1/053; F01L1/0532; F02F1/242; F02B; F02B1/00; F02B1/02; F02B1/04; F02B23/00; F02B23/08; F02B2023/085; F02B2275/00; F02B2275/18; F02F2001/241; F02F2001/244; F02F2001/245
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
100 words
An internal combustion engine having a cylinder head comprising a boundary wall defining a combustion chamber at one end of the cylinder, an inlet recess and an outlet recess in the boundary wall, an inlet port and an outlet each being defined by an annular wall forming a valve seat in the respective recess, an inlet and an outlet poppet valve controlling the inlet and outlet ports respectively and each having a head and stem slidable in a valve guide, at least the inlet recess being of sufficient depth to accommodate the inlet valve head in its maximum lift position.
Claim 2
Dependent Claim
100 words
An internal combustion engine having a cylinder head comprising a boundary wall defining a combustion chamber at one end of the cylinder, an inlet recess and an outlet recess in the boundary wall, an inlet port and an outlet each being defined by an annular wall forming a valve seat in the respective recess, an inlet and an outlet poppet valve controlling the inlet and outlet ports respectively and each having a head and stem slidable in a valve guide, at least the inlet recess being of sufficient depth to accommodate the inlet valve head in its maximum lift position.
Claim 3
Dependent Claim
20 words
A cylinder head according to claim 1 in which the valves have axes making an angle with the cylinder axis.
Claim 4
Dependent Claim
49 words
A cylinder head according to claim 1 in which the inlet port on its side remote from the combustion chamber connects with a gas passage having a part of circular cross section coaxial with the inlet valve stem and of a smaller cross section area than the inlet port.
Claim 5
Dependent Claim
47 words
A cylinder head according to claim 3 in which the gas passage includes at least two side tracts converging symmetrically into the circular cross section part such that the combined momentum of converging gas streams entering the part from the tracts is parallel with the valve stem.
Claim 6
Dependent Claim
33 words
A cylinder head according to claim 4 in which the circular cross section part has smoothly outwardly diverging wall surfaces which merge smoothly with the inlet valve seat and the side tracts, respectively.
Claim 7
Dependent Claim
32 words
A cylinder head according to claim 1 in which the inlet valve seat on its side adjacent the combustion chamber, merges smoothly into an outwardly diverging wall portion of the inlet recess.
Claim 8
Dependent Claim
26 words
A cylinder head according to claim 6 in which the outwardly diverging wall portions merge smoothly into a substantially cylindrical wall portion of the inlet recess.
Claim 9
Dependent Claim
31 words
A cylinder head according to claim 7 in which the substantially cylindrical wall portion extends from the valve seat at least to the maximum lift position of the inlet valve head.
Claim 10
Dependent Claim
19 words
A cylinder head according to claim 8 in which the outlet recess is similarly shaped to the inlet recess.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |