Marine propulsion – Screw propeller – With means effecting or facilitating movement of propulsion...
Patent
1995-02-01
1996-04-23
Basinger, Sherman
Marine propulsion
Screw propeller
With means effecting or facilitating movement of propulsion...
440 61, 440112, B63H 2008
Patent
active
055098339
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a boat propulsion unit intended to be suspended on the outside of a boat transom and driveably connected to an engine on the inside of the transom. Such unit comprises a propeller drive shaft housing, a suspension arrangement intended to be fixedly secured to the transom, pivot means which pivotally connect the drive shaft housing to the suspension arrangement to allow pivotal displacement of the drive shaft housing relative to the suspension arrangement about a pivot axis in a vertical plane and a pivot axis in horizontal plane, steering means which is arranged to effect pivotal displacement of the drive shaft housing about the first-mentioned axis, and trim and tilt means which is arranged to effect pivotal displacement of the drive shaft housing about the second-mentioned axis.
BACKGROUND OF THE INVENTION
Conventional boat propulsion units of the above-mentioned type, for example so-called Aquamatic.RTM. drive units, incorporate a carrier screwed to the boat transom. The propeller drive shaft housing is suspended from the carrier by means of a forked bracket which is pivotable about a horizontal transverse axis accommodated in the carrier. A substantially vertical steering axis or spindle is connected to the drive shaft housing and is journalled in the forked bracket. A steering arm cooperates with the spindle. The steering mechanism of the boat, for example a push-pull cable or a servo unit, acts on the steering arm in order to cause its displacement and thereby that of the propeller drive shaft housing. Trimming and tilting of the drive shaft housing is achieved by pivoting the forked bracket upwardly. This is normally carried out with the help of a pair of hydraulic cylinder arrangements, with one hydraulic cylinder acting on each leg of the forked bracket.
SUMMARY OF THE INVENTION
It is a general object of the present invention to provide a boat propulsion unit which can be produced at a considerably lower cost than propulsion units of the above-described known type and which, in addition, is simpler to install on a boat.
This is achieved in accordance with the present invention by means of the suspension arrangement comprising a frame member which is intended to be fixed around an opening in a boat transom, and a carrier attached to the frame member and shaped so that it forms a flywheel casing for an engine, said carrier covering the opening and supporting said pivot means.
BRIEF DESCRIPTION OF THE DRAWINGS
Advantages attained by the invention will be apparent from the following description and with reference to the embodiment shown in the attached drawings, of which
FIG. 1 shows a schematic partial sectional view of a boat propulsion unit according to the invention, and
FIG. 2 is an enlargement of the region II of FIG. 1.
DETAILED DESCRIPTION OF THE INVENTION
In FIG. 1, reference numeral 1 generally denotes a boat propulsion unit of the so-called INU-type, for example an Aquamatic.RTM.-drive unit, which consists of two main components, namely a suspension arrangement 2 and a propeller drive shaft housing 3.
The suspension arrangement 2 consists of two main parts, i.e. a frame member 5 affixed to a boat transom 4 and an inner carrier supported by the frame member 5. The frame member 5 is an extruded aluminum profile, which presents a hollow cavity 7 that can be used for various purposes. For example, the cavity can be used to conduct exhaust gases and cooling water from an engine 8 connected to the propulsion unit 1, whereby the cavity presents an inlet (not shown) and an outlet 9 for the cooling water and the exhaust gases. Alternatively, the frame member 5 can be used as a cooler for various fluids, for example engine oil, whereby the lubrication system of the engine communicates via not shown inlets and outlets with the cavity 7 in the frame member 5.
The aluminum profile which forms the frame member 5 is provided with a U-shaped slot 10 in which a seal 11 is inserted. The frame member 5 is affixed to the outside of the boat t
REFERENCES:
patent: 3006311 (1961-10-01), Hansson et al.
patent: 3136281 (1964-06-01), Kiekhaefer et al.
patent: 3368517 (1968-02-01), Macdonald et al.
patent: 3430604 (1969-03-01), Pike et al.
patent: 3626467 (1971-12-01), Mazziotti
patent: 4370138 (1983-01-01), Wikla
AB Volvo Penta
Basinger Sherman
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