US4430968A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cylinder head fastening structure for internal combustion engines
Assignee: Yamaha Motor Co Ltd
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Filing: 1982-05-07
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Granted: 1984-02-14
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Expires: 2002-05-07
Abstract
Abstract An improved cylinder head fastening arrangement for an internal combustion engine that permits location of overhead cam shafts directly over the cylinder head fasteners. The cam shafts are formed with access openings that extend through them which permits a tool to be passed for tightening of the cylinder head fasteners without removal of the cam shaft.
Inventors
- 👤 Yorio Futakuchi
- 👤 Nobuaki Oshiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:40
CPC Classifications
F; F01; F01M; F01M9/00; F01M9/10; F01M9/102; F01L; F01L1/00; F01L1/02; F01L1/04; F01L1/047; F01L1/053; F01L1/0532; F01M11/00; F01M11/02; F01L1/026; F01L2001/0537; F02; F02B; F02B2275/00; F02B2275/18
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
81 words
In a construction for an overhead cam internal combustion engine comprising a cylinder head adapted to be affixed to another component of the engine by at least one fastener, the improvement comprising a cam shaft journaled for rotation relative to said cylinder head, said cam shaft being positioned in overlying relationship to said fastener and means defining an access opening passing through said cam shaft and adapted to pass a tool for tightening said fastener without removal of said cam shaft.
Claim 2
Dependent Claim
81 words
In a construction for an overhead cam internal combustion engine comprising a cylinder head adapted to be affixed to another component of the engine by at least one fastener, the improvement comprising a cam shaft journaled for rotation relative to said cylinder head, said cam shaft being positioned in overlying relationship to said fastener and means defining an access opening passing through said cam shaft and adapted to pass a tool for tightening said fastener without removal of said cam shaft.
Claim 3
Dependent Claim
26 words
A construction for an overhead cam internal combustion engine as set forth in claim 1 wherein the cam shaft is rotatably journaled by the cylinder head.
Claim 4
Dependent Claim
37 words
A construction for an overhead cam internal combustion engine as set forth in claim 2 wherein the access opening passes through an area of the cam shaft where said cam shaft is journaled by the cylinder head.
Claim 5
Dependent Claim
31 words
A construction for an overhead cam internal combustion engine as set forth in claim 3 further including means for delivering lubricant to the access opening for lubricating the cam shaft journal.
Claim 6
Dependent Claim
38 words
A construction for an overhead cam internal combustion engine as set forth in claim 1 further including means formed on the cam shaft for facilitating rotation of the cam shaft to align the access opening with the fastener.
Claim 7
Dependent Claim
34 words
A construction for an overhead cam internal combustion engine as set forth in claim 5 wherein the means for facilitating turning of the cam shaft comprises a hexagonal portion formed on the cam shaft.
Claim 8
Dependent Claim
64 words
A construction for an overhead cam internal combustion engine as set forth in claim 1 wherein there are a pair of cam shafts positioned on opposite sides of the cylinder head and fastening means positioned beneath each of the cam shafts, each cam shaft having an access opening adapted to pass a tool for tightening the fastener without removal of the respective cam shaft.
Claim 9
Dependent Claim
26 words
A construction for an overhead cam internal combustion engine as set forth in claim 7 wherein the cam shafts are rotatably journaled by the cylinder head.
Claim 10
Dependent Claim
37 words
A construction for an overhead cam internal combustion engine as set forth in claim 8 wherein the access openings pass through an area of the cam shafts where said cam shafts are journaled by the cylinder head.
Claim 11
Dependent Claim
31 words
A construction for an overhead cam internal combustion engine as set forth in claim 9 further including means for delivering lubricant to the access openings for lubricating the cam shaft journals.
Claim 12
Dependent Claim
42 words
A construction for an overhead cam internal combustion engine as set forth in claim 10, further including means formed on at least one of the cam shafts for facilitating rotation of the cam shafts to align the access openings with the fasteners.
Claim 13
Dependent Claim
34 words
A construction for an overhead cam internal combustion engine as set forth in claim 11 wherein the means for facilitating turning of the cam shaft comprises a hexagonal portion formed on the cam shaft.
Claim 14
Dependent Claim
26 words
A construction for an overhead cam internal combustion engine as set forth in any of the preceding claims wherein the fastening means comprises a threaded fastener.
Claim 15
Dependent Claim
28 words
A construction for an overhead cam internal combustion engine as set forth in claim 13 wherein the threaded fastener has a socket opening adapted to receive the tool.
Claim 16
Dependent Claim
92 words
A construction for an overhead cam internal combustion engine as set forth in claim 1 wherein there are a plurality of longitudinally spaced fasteners and the cam shaft has access openings associated with each of the fasteners, the cam shaft being rotatably supported by the cylinder head through bearing portions juxtaposed to the respective of the fasteners, the cam shaft having a longitudinally extending lubricating passage intersecting the access openings and further including means for delivering lubricant to said lubricant passage for lubricating the cam shaft bearing portions through the access openings.
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) | 1987-02-13 | 1987-08-15 | 1988-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-13 | 1991-08-15 | 1992-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-13 | 1995-08-15 | 1996-02-14 | $7700.00 | Window Closed / Lapsed |