US4637357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tappet arrangement for engine valve train
Assignee: Yamaha Motor Co Ltd
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Filing: 1985-04-29
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Granted: 1987-01-20
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Expires: 2005-04-29
Abstract
Abstract A valve arrangement for an internal combustion engine that permits the use of a plurality of closely spaced valves. The valves are all directly actuated by means of thimble tappets that have non-cylindrical cross-sections so as to permit the tappet bodies to be positioned close to each other and yet afford a large area for their sliding support. The tappet bodies are also supported within the cylinder head assembly by means including a separate insert.
Inventors
- 👤 Masatoshi Ohmi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:12
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/12; F01L1/14; F01L1/143; F01L1/02; F01L1/04; F01L1/047; F01L1/053; F01L1/0532; F01L1/26; F01L1/265; F02; F02F; F02F1/00; F02F1/24; F02F1/42; F02F1/4214; F01L2307/00; F02B; F02B2275/00; F02B2275/18; F02F2001/244; F02F2001/245
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
124 words
In a valve arrangement for an internal combustion engine comprising a cylinder head assembly, a plurality of poppet valves supported by said cylinder head assembly at one side thereof for reciprocation between opened and closed positions, said valves being juxtaposed to each other, a camshaft, and a plurality of slidably supported tappets supported by said cylinder head assembly and each interposed between said camshaft and a respective one of said valves, the improvement comprising at least one of said tappets being non-circular in cross-sections taken perpendicular to its line of reciprocation and having a short dimension extending in the direction of the adjacent valves and a long dimension extending in the perpendicular direction, the distance between said valves being less than said long dimension.
Claim 2
Dependent Claim
124 words
In a valve arrangement for an internal combustion engine comprising a cylinder head assembly, a plurality of poppet valves supported by said cylinder head assembly at one side thereof for reciprocation between opened and closed positions, said valves being juxtaposed to each other, a camshaft, and a plurality of slidably supported tappets supported by said cylinder head assembly and each interposed between said camshaft and a respective one of said valves, the improvement comprising at least one of said tappets being non-circular in cross-sections taken perpendicular to its line of reciprocation and having a short dimension extending in the direction of the adjacent valves and a long dimension extending in the perpendicular direction, the distance between said valves being less than said long dimension.
Claim 3
Dependent Claim
37 words
In a valve arrangement as set forth in claim 1 wherein the cylinder head assembly comprises a cylinder head that slidably supports the valves and a tappet body affixed to the cylinder head and supporting the tappets.
Claim 4
Dependent Claim
23 words
In a valve arrangement as set forth in claim 1 wherein there are three valves and the valves all serve the same function.
Claim 5
Dependent Claim
16 words
In a valve arrangement as set forth in claim 3 wherein the valves have non-parallel axes.
Claim 6
Dependent Claim
22 words
In a valve arrangement as set forth in claim 4 wherein the axes of the valves all intersect at a common point.
Claim 7
Dependent Claim
30 words
In a valve arrangement as set forth in claim 5 wherein the common point of intersection of the valve axes lies coincident with the axis of rotation of the camshaft.
Claim 8
Dependent Claim
22 words
In a valve arrangement as set forth in claim 1 wherein adjacent tappet bodies have flattened surfaces extending parallel to each other.
Claim 9
Dependent Claim
26 words
In a valve arrangement as set forth in claim 7 wherein the portions of the tappet bodies not adjacent to each other are semi-circular in cross-section.
Claim 10
Dependent Claim
46 words
In a valve arrangement as set forth in claim 8 wherein there are three valves and three tappet bodies, the central tappet body having parallel flattened sides connected by curves sections and the remaining tappet bodies have semi-cylindrical sides flattened adjacent to the central tappet body.
Claim 11
Dependent Claim
18 words
In a valve arrangement as set forth in claim 1 wherein the tappets have an insert interposed therebetween.
Claim 12
Dependent Claim
49 words
In a valve arrangement as set forth in claim 1 wherein the tappet bodies are slidably supported by a body of the cylinder head assembly formed with an opening therein and an insert received within the opening and engaging adjacent sides of the tappet bodies for their slidable support.
Claim 13
Dependent Claim
65 words
In a valve tappet arrangement for operating the valves of an internal combustion engine comprising an engine body defining a continuous opening, a pair of tappets disposed in said opening, having flat sides, and adapted to be supported for reciprocation, a single insert received within said opening and having respective surfaces engaged with said flat sides of said tappets for forming a bearing surface therefor.
Claim 14
Dependent Claim
65 words
In a valve tappet arrangement for operating the valves of an internal combustion engine comprising an engine body defining a continuous opening, a pair of tappets disposed in said opening, having flat sides, and adapted to be supported for reciprocation, a single insert received within said opening and having respective surfaces engaged with said flat sides of said tappets for forming a bearing surface therefor.
Claim 15
Dependent Claim
32 words
In a valve tappet arrangement as set forth in claim 12 wherein the tappets have surfaces that are engaged with the engine body and other surfaces that are engaged with the insert.
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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) | 1990-01-19 | 1990-07-21 | 1991-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-19 | 1994-07-21 | 1995-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-19 | 1998-07-21 | 1999-01-20 | $7700.00 | Window Closed / Lapsed |