EP3006326A1 - Verbesserte Außenbordmotoreinheit - Google Patents

Verbesserte Außenbordmotoreinheit Download PDF

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Publication number
EP3006326A1
EP3006326A1 EP14188493.2A EP14188493A EP3006326A1 EP 3006326 A1 EP3006326 A1 EP 3006326A1 EP 14188493 A EP14188493 A EP 14188493A EP 3006326 A1 EP3006326 A1 EP 3006326A1
Authority
EP
European Patent Office
Prior art keywords
motor
motor unit
propeller
water
aperture
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP14188493.2A
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English (en)
French (fr)
Inventor
Franco Moro
Eros Scarpa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to EP14188493.2A priority Critical patent/EP3006326A1/de
Publication of EP3006326A1 publication Critical patent/EP3006326A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H20/00—Outboard propulsion units, e.g. outboard motors or Z-drives; Arrangements thereof on vessels
    • B63H20/28—Arrangements, apparatus and methods for handling cooling-water in outboard drives, e.g. cooling-water intakes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H21/00—Use of propulsion power plant or units on vessels
    • B63H21/12—Use of propulsion power plant or units on vessels the vessels being motor-driven
    • B63H21/17—Use of propulsion power plant or units on vessels the vessels being motor-driven by electric motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/20—Cooling circuits not specific to a single part of engine or machine
    • F01P3/202—Cooling circuits not specific to a single part of engine or machine for outboard marine engines

Definitions

  • the present invention relates to an improved outboard motor unit.
  • Motors for watercraft include outboard motors, so-called because the motor unit is mounted at the craft stern board, and remains suspended outside its hull.
  • the motor unit is housed within a single cover block or cowling of plastic or metal construction.
  • the actual motor which can be of internal combustion engine type (petrol or diesel) or electric type, is positioned in the top of the cover block and is mechanically connected to the propeller which is positioned in the bottom of the cover block, which is immersed in water and provided with a vertically projecting fin.
  • motor units of small cylinder capacity are known, which are housed within the cover block at a lower level than the hull waterline, and to which the motor unit is applied. These motor units do not require a cooling system, as heat exchange takes place directly between the walls of the cavity of the block housing the motor unit and the water, in which the motor unit is immersed.
  • Motor units both of electric and internal combustion engine type, used in particular for planing boats are also known, in which the motor is usually of large cylinder capacity. These motor units require a cooling circuit, which comprises a pump for withdrawing water from around the motor unit and transfers it into a cooling circuit which feeds it to the motor.
  • the pump which transfers the water to the cooling circuit is positioned in the central portion of the cover block, i.e. in the zone which houses the vertical transmission shaft and which lies between motor positioned upperly and the propeller positioned lowerly.
  • US 3025824 describes a motor unit with a cooling system in which the containment casing lowerly presents a body of tapering profile; the inlet water to the impeller of the cooling circuit enters through an aperture defined in said tapering body in a position out of alignment with the axis passing through the body tip.
  • the propeller shaft and the impeller shaft are not connected directly together; in particular, the motor shaft is connected to the propeller shaft via a first gear, and to the impeller shaft via a second gear.
  • This motor unit is rather complicated to produce and hence costly.
  • US 4832635 does not describe an outboard motor unit, but specifically relates to the construction of the conical nose portion of a marine engine to be installed on ships of large dimensions. Specifically, because of the large spaces available in this type of craft, the engine is disposed horizontally with respect to the propeller axis, and the cooling system does not comprise an impeller, as it would not be able to provide a sufficient intake force for the water.
  • the main object of the invention is to propose an improved motor unit able to eliminate the drawbacks of the traditional solutions.
  • Anther object of the invention is to propose an improved motor unit having a cooling system more efficient than traditional systems.
  • Anther object of the invention is to propose an outboard motor unit of simple, quick and low-cost construction.
  • the motor unit comprises a containment structure, composed of an upper cover, not shown, which is always positioned above the hull waterline, and an underlying containment casing defining the foot 4.
  • the upper portion 6 of the foot 4 has a shape which extends horizontally in the longitudinal direction to define a front cylindrical cavity 8 for housing an electric motor 10, and a rear compartment 12 for housing an electronic card 14 for its control.
  • the motor 10 is of vertical axis, with its operation controlled by the electronic card 14.
  • the upper cover of the motor unit houses the powering batteries, preferably of lithium type, which are rechargeable by connection to a normal electric socket; in addition, the interior of the cover can also house supplementary batteries and a battery charger.
  • the motor 10 can also be of internal combustion engine type and be housed inside the upper cover of the motor unit, to hence be positioned completely above the hull waterline.
  • the motor 10 can be disposed inside the upper portion 6 of the foot 4 in such a manner that a part thereof is located at a lower level than the hull waterline.
  • the electronic card 14 is positioned within the containment structure at a level below the hull waterline.
  • the front cylindrical cavity 8 housing the electric motor 10 and/or the rear compartment 12 housing the electronic card 14 are located in proximity to those outer walls of the containment structure which are in contact with the water in which the hull is immersed; in greater detail, the cavity 8 and/or the rear compartment 12 are disposed within the containment structure such that heat exchanges takes place directly between these and the water which grazes the outer walls of the containment structure; this enables the electronic card 14 to be cooled and, moreover, can also advantageously contribute to the cooling of the motor 10.
  • connection portion 18 which extends vertically and has a limited width in the transverse direction.
  • a chamber 20 housing a shaft 22 for transmitting motion from the motor 10 to a propeller 24.
  • the propeller 24 is mounted and housed in the lower portion 16 of the foot 4.
  • the lower portion 16 is of tapering profile, preferably nose-shaped, to enable optimal fluidodynamic penetration into water.
  • the lower portion 16 also presents a through aperture 30 at the tip of the tapering profile (see Figure 1 ).
  • the through aperture 30 is aligned with the axis 31 passing centrally through the tapering profile of the lower portion 16 and about which the tapering outer surface of the lower portion 16 develops by rotation.
  • the lower portion 16 comprises an internally hollow tapering structure of substantially horizontal axis.
  • this structure connects at its rear to a cylindrical portion 26, while at its front it connects to a nose-shaped cap 28 provided with the through aperture 30.
  • the cap 28 is removable to provide easy quick access to the components housed within the lower portion 16, for carrying out maintenance operations.
  • the rotation shaft 32 of the propeller 24, with relative support bearings 34, is inserted through the lower portion 16.
  • the shaft 32 of the propeller 24 is mechanically connected to the transmission shaft 22 via a pair of bevel gears 36, 36', housed in a chamber 38 provided in the lower portion 16.
  • Both the chamber 20 and the chamber 38 are completely isolated from the outside and are filled with oil, such that the shaft 22 and the bevel gears 36, 36' are able to work with very low friction and virtually without requiring maintenance.
  • the front end of the propeller shaft 32 is directly connected to, and rigidly associated with, an impeller 40.
  • the rotation shaft 32 of the propeller is aligned with and coincides with the rotation shaft of the impeller 40.
  • the impeller 40 acts on the water which, via the through aperture 30, enters a channel 42, defined preferably within the shaped cap 28.
  • the shaft 32 of the propeller 24 and of the impeller 40 is aligned with the through aperture 30, with the water inlet channel 42, and with the axis of rotation 31 about which the tapering profile of the lower portion 16 develops, and in which said shaft 32 is housed.
  • a shield 44 is provided for closing the hydraulic part and for isolating it from the chamber 38 containing the bevel gears 36, 36'.
  • a vertical conduit 46 extends radially from the top of the chamber housing the impeller 40, and passes through the connection portion 18 to feed the water originating from the impeller 40 into an annular chamber 48 of vertical axis, which surrounds a large part of the cylindrical cavity 8 housing the electric motor 10.
  • This annular chamber 48 is also provided with a hole or conduits, not shown, for discharging the water to the outside after it has exchanged heat with the motor 10.
  • a cooling circuit is defined for the motor 10 into which the water, in which the motor unit is immersed, enters (in particular through suitable conduits present in the containment casing) via the aperture 30.
  • the impeller 40 then acts such as to feed the water, which has enters the circuit, to a delivery conduit for cooling the motor 10. Subsequently, after cooling the motor 10, the water leaves to the outside of the foot 4 from another through aperture, not shown.
  • the water originating from the impeller 40 is fed into a suitable motor cooling circuit, comprising a heat exchanger.
  • the lower portion 16 of the foot 4 extends downwards into a vertical fin 50, which enables the motor unit to be suitably used as a rudder.
  • the water entry aperture and conduit leading to the impeller, the impeller rotation shaft, the propeller shaft and the axis of rotation about which the tapering body of the lower portion develops are all mutually aligned.
  • This specific configuration enables improved hydrodynamic behaviour; in particular, by positioning the aperture at the tip of the tapering body, the water is drawn into the cooling system, with consequent nullification of the stagnation point and the overpressure usually present at said point.
  • this enables a greater water flow to enter the cooling system; in particular, on increasing the advancement velocity of the craft, the water flow entering the cooling system also increases, due both to the suction effect of the impeller, and the particular hydrodynamic effect of the absence of a stagnation point at the tip of the tapering body. In this manner, for equal liquid handled, the primary energy absorbed by the impeller is reduced.
  • the impeller is connected directly to the front end of the propeller shaft, while in US 3015824 the propeller shaft and impeller shaft are not connected together directly, but via the motor rotation shaft.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP14188493.2A 2014-10-10 2014-10-10 Verbesserte Außenbordmotoreinheit Withdrawn EP3006326A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14188493.2A EP3006326A1 (de) 2014-10-10 2014-10-10 Verbesserte Außenbordmotoreinheit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14188493.2A EP3006326A1 (de) 2014-10-10 2014-10-10 Verbesserte Außenbordmotoreinheit

Publications (1)

Publication Number Publication Date
EP3006326A1 true EP3006326A1 (de) 2016-04-13

Family

ID=51842339

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14188493.2A Withdrawn EP3006326A1 (de) 2014-10-10 2014-10-10 Verbesserte Außenbordmotoreinheit

Country Status (1)

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EP (1) EP3006326A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE2251034A1 (en) * 2021-11-11 2023-05-12 Volvo Penta Corp A marine drive unit with integrated cooling water pump

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE607866C (de) * 1935-01-09 Prometheus G M B H Maschf Kuehlwasserfoerderung, insbesondere fuer Bootsmotoren
US3015824A (en) 1959-08-18 1962-01-09 Grace W R & Co Clip crimping apparatus
US3025824A (en) 1959-10-28 1962-03-20 Mcculloch Corp Outboard motor water pump arrangement
US4832635A (en) 1988-02-26 1989-05-23 Brunswick Corporation Nose construction for the gear case of a marine drive
EP0816222A2 (de) * 1996-06-27 1998-01-07 Moriyama Kogyo Kabushiki Kaisha Antriebseinheit für Wasserfahrzeuge
JP2005162055A (ja) * 2003-12-03 2005-06-23 Suzuki Motor Corp 電動式船外機

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE607866C (de) * 1935-01-09 Prometheus G M B H Maschf Kuehlwasserfoerderung, insbesondere fuer Bootsmotoren
US3015824A (en) 1959-08-18 1962-01-09 Grace W R & Co Clip crimping apparatus
US3025824A (en) 1959-10-28 1962-03-20 Mcculloch Corp Outboard motor water pump arrangement
US4832635A (en) 1988-02-26 1989-05-23 Brunswick Corporation Nose construction for the gear case of a marine drive
EP0816222A2 (de) * 1996-06-27 1998-01-07 Moriyama Kogyo Kabushiki Kaisha Antriebseinheit für Wasserfahrzeuge
JP2005162055A (ja) * 2003-12-03 2005-06-23 Suzuki Motor Corp 電動式船外機

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE2251034A1 (en) * 2021-11-11 2023-05-12 Volvo Penta Corp A marine drive unit with integrated cooling water pump

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