US4726799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Outboard motor
Assignee: Yamaha Marine Co Ltd
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Filing: 1986-02-10
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Granted: 1988-02-23
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Expires: 2006-02-10
Abstract
Abstract An outboard motor arrangement and particularly an improved power head construction therefor embodying a hinged cover member that is pivotal to offer access to the engine for servicing without necessitating its removal. In addition, an elastomeric support is provided for the engine that minimizes the transmission of vibrations from the engine to the associated watercraft.
Inventors
- 👤 Norimichi Harada
- 👤 Ryoji Nakahama
- 👤 Naoyoshi Kuragaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:13
CPC Classifications
F; F02; F02B; F02B61/00; F02B61/04; F02B61/045; F02B75/00; F02B75/02; F02B2075/022; F02B2075/027; F02B2275/00; F02B2275/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
237 words
An outboard motor comprising a power head comprised of an internal combustion engine having a generally upwardly extending cylinder with operating components thereof which require servicing at its upper end and its output shaft journaled for rotation about a generally horizontally disposed axis, means for driving a drive shaft disposed beneath said output shaft axis from said output shaft, and a protective cowling comprising a lower member encircling said output shaft and having an upwardly disposed opening for affording access to said engine and said operating components, a drive shaft housing affixed against rotation to and depending from said lower member, said drive shaft being journaled within said drive shaft housing, and a lower unit depending beneath and rigidly affixed to said drive shaft housing, said lower unit carrying propulsion means driven by said drive shaft, means for mounting said power head, said drive shaft housing and said lower unit as a complete assembly relative to a transom of an associated watercraft for steering movement about a generally vertically extending axis and for tilting movement about a generally horizontally extending axis, said protective cowling further including a cover member hingedly connected to said protective cowling lower member about a hinge axis disposed rearwardly of said power head from said tilting axis and extending parallel to said tilting axis when said power head is in a straight ahead steered condition and adapted to close said lower member opening.
Claim 2
Dependent Claim
237 words
An outboard motor comprising a power head comprised of an internal combustion engine having a generally upwardly extending cylinder with operating components thereof which require servicing at its upper end and its output shaft journaled for rotation about a generally horizontally disposed axis, means for driving a drive shaft disposed beneath said output shaft axis from said output shaft, and a protective cowling comprising a lower member encircling said output shaft and having an upwardly disposed opening for affording access to said engine and said operating components, a drive shaft housing affixed against rotation to and depending from said lower member, said drive shaft being journaled within said drive shaft housing, and a lower unit depending beneath and rigidly affixed to said drive shaft housing, said lower unit carrying propulsion means driven by said drive shaft, means for mounting said power head, said drive shaft housing and said lower unit as a complete assembly relative to a transom of an associated watercraft for steering movement about a generally vertically extending axis and for tilting movement about a generally horizontally extending axis, said protective cowling further including a cover member hingedly connected to said protective cowling lower member about a hinge axis disposed rearwardly of said power head from said tilting axis and extending parallel to said tilting axis when said power head is in a straight ahead steered condition and adapted to close said lower member opening.
Claim 3
Dependent Claim
55 words
A power head for an outboard motor as set forth in claim 1 wherein the means for driving the drive shaft comprises a countershaft rotatable about an axis parallel to the axis of the rotation of the engine output shaft and driven therefrom and bevel gear means for driving said drive shaft from said countershaft.
Claim 4
Dependent Claim
85 words
A power head for an outboard motor as set forth in claim 1 wherein the engine operates on the four-stroke cycle and has a cylinder block and crankcase rotatably supporting the engine output shaft and a cylinder head affixed to the cylinder block, there being valve operating means disposed within said cylinder head for operating valves for the engine, the lower housing opening being in juxtaposed relationship to said cylinder head and said valve operating means for servicing thereof upon opening of said cover member.
Claim 5
Dependent Claim
28 words
A power head for an outboard motor as set forth in claim 1 wherein the engine is of the in-line type with cylinders inclined rearwardly to the vertical.
Claim 6
Dependent Claim
57 words
A power head for an outboard motor as set forth in claim 4 wherein the means for driving the drive shaft comprises a countershaft rotatable about an axis parallel to the axis of the rotation of the engine output shaft and driven therefrom and bevel gear means for driving a vertically extending drive shaft from said countershaft.
Claim 7
Dependent Claim
85 words
A power head for an outboard motor as set forth in claim 5 wherein the engine operates on the four-stroke cycle and has a cylinder block and crankcase rotatably supporting the engine output shaft and a cylinder head affixed to the cylinder block, there being valve operating means disposed within said cylinder head for operating valves for the engine, the lower housing opening being in juxtaposed relationship to said cylinder head and said valve operating means for servicing thereof upon opening of said cover member.
Claim 8
Dependent Claim
80 words
A power head for an outboard motor as set forth in claim 1 wherein the means for mounting the power head, drive shaft housing and lower unit as a complete assembly relative to the transom comprises a first elastomeric member affixed directly to the engine above the axis of rotation of its output shaft and a pair of lower elastomeric members operatively connected to the engine at transversely spaced points and below the axis of rotation of its output shaft.
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) | 1991-02-22 | 1991-08-24 | 1992-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-22 | 1995-08-24 | 1996-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-22 | 1999-08-24 | 2000-02-23 | $7700.00 | Window Closed / Lapsed |