Patent US4572117A successfully refreshed from Google Patents.
US4572117A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve arrangement for an internal combustion engine
Assignee: Yamaha Motor Co Ltd
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Filing: 1985-03-14
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Granted: 1986-02-25
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Expires: 2005-03-14
Abstract
Abstract A valve train for an internal combustion engine embodying an improved valve spring arrangement that permits a compact valve placement. The valve springs are disposed so that they are non-circular in planes perpendicular to the axis of the associated valve stem and are disposed with a long axis and a short axis. The long axes of the respective springs extend parallel to each other so as to facilitate the close placement of the valves.
Inventors
- 👤 Masaaki Yoshikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:57
CPC Classifications
F; F02; F02F; F02F1/00; F02F1/24; F02F1/42; F02F1/4214; F02F1/4221; F01; F01L; F01L1/00; F01L1/02; F01L1/04; F01L1/047; F01L1/053; F01L1/0532; F01L1/26; F01L1/265; F01L2001/0537; F02B; F02B1/00; F02B1/02; F02B1/04; F02B2275/00; F02B2275/18; F02F2001/244; F02F2001/245
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
100 words
In an internal combustion engine comprising components defining a combustion chamber and a pair of poppet type valves for controlling the communication with said combustion chamber, said valves having their heads and stems positioned in close proximity, the improvement comprising coil springs each acting on a respective one of said valve stems for urging said valves to their closed position, said valve springs having their coils arranged to have a long axis and a short axis in planes perpendicular to the stems of said valves with the long axes of said springs of the respective valves being in parallel planes.
Claim 2
Dependent Claim
100 words
In an internal combustion engine comprising components defining a combustion chamber and a pair of poppet type valves for controlling the communication with said combustion chamber, said valves having their heads and stems positioned in close proximity, the improvement comprising coil springs each acting on a respective one of said valve stems for urging said valves to their closed position, said valve springs having their coils arranged to have a long axis and a short axis in planes perpendicular to the stems of said valves with the long axes of said springs of the respective valves being in parallel planes.
Claim 3
Dependent Claim
35 words
In an internal combustion engine as set forth in claim 1 wherein one of the components comprises a cylinder head and the valves are slidably supported and control flow through ports in the cylinder head.
Claim 4
Dependent Claim
18 words
In an internal combustion engine as set forth in claim 2 wherein the valves serve the same function.
Claim 5
Dependent Claim
51 words
In an internal combustion engine as set forth in claim 3 further including a third valve forming the same function and having a similarly shaped spring, said three valves comprising intake valves and further including a pair of exhaust valves for controlling the flow of exhaust gases from the combustion chamber.
Claim 6
Dependent Claim
43 words
In an internal combustion engine as set forth in claim 4 wherein there are coil spring means associated with the exhaust valves and said coil springs have a round configuration in planes perpendicular to the axis of the stems of the exhaust valves.
Claim 7
Dependent Claim
23 words
In an internal combustion engine as set forth in claim 2 wherein the valves are disposed at a different angle to each other.
Claim 8
Dependent Claim
20 words
In an internal combustion engine as set forth in claim 6 wherein the valves stems intersect at the same point.
Claim 9
Dependent Claim
18 words
In an internal combustion engine as set forth in claim 7 wherein the valves serve the same function.
Claim 10
Dependent Claim
51 words
In an internal combustion engine as set forth in claim 8 further including a third valve forming the same function and having a similarly shaped spring, said three valves comprising intake valves and further including a pair of exhaust valves for controlling the flow of exhaust gases from the combustion chamber.
Claim 11
Dependent Claim
43 words
In an internal combustion engine as set forth in claim 9 wherein there are coil spring means associated with the exhaust valves and said coil springs have a round configuration in planes perpendicular to the axis of the stems of the exhaust valves.
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) | 1989-02-24 | 1989-08-26 | 1990-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-24 | 1993-08-26 | 1994-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-24 | 1997-08-26 | 1998-02-25 | $7700.00 | Window Closed / Lapsed |