MARINE REDUCTION GEAR

• US 20180312236A1
• Filed: 10/20/2016
• Published: 11/01/2018
• Est. Priority Date: 10/23/2015
• Status: Active Grant

• Current Assignee: Kawasaki Jukogyo Kabushiki Kaisha
• Original Assignee: Kawasaki Jukogyo Kabushiki Kaisha
• Inventors: MIYAMAE, Ryo, TAKAHASHI, Shoichi, OHNO, Tatsuya, OZAKI, Yoshihiko, MASAMOTO, Kenichi
• Granted Patent: US 10,442,517 B2
• Time in Patent Office: Days
• CPC Class Codes: B63H 2021/202 of hybrid electric type
• CPC Class Codes: B63H 2021/205 the second power unit being of the internal combustion engine type, or the like, e.g. a Diesel engine
• CPC Class Codes: B63H 2021/207 the second power unit being a gas turbine
• CPC Class Codes: B63H 21/17 by electric motor
• CPC Class Codes: B63H 21/20 the vessels being powered by combinations of different types of propulsion units
• CPC Class Codes: B63H 21/38 Apparatus or methods specially adapted for use on marine vessels, for handling power plant or unit liquids, e.g. lubricants, coolants, fuels or the like in outboard drives B63H20/001; lubricating or cooling machines or engines in general F01 - F04
• CPC Class Codes: B63H 23/12 allowing combined use of the propulsion power units
• CPC Class Codes: B63J 3/02 from propulsion power plant
• CPC Class Codes: F16H 1/06 with parallel axes
• CPC Class Codes: F16H 57/04 Features relating to lubrication or cooling or heatingin hydrokinetic gearing F16H41/30; control of lubrication or cooling in hydrostatic gearing F16H61/4165
• CPC Class Codes: F16H 57/0412 Cooling or heating; Control of temperature
• CPC Class Codes: F16H 57/0436 Pumps
• CPC Class Codes: H02K 7/116 with gears
• CPC Class Codes: Y02T 70/5236 Renewable or hybrid-electric solutions

Abstract

A marine reduction gear makes it possible to reduce the installation space of an electrical rotating machine. A marine reduction gear includes: an input shaft coupled to an output shaft of an engine; an output shaft coupled to a propeller shaft that rotates a screw propeller; a gearbox accommodating an input gear provided on the input shaft and an output gear provided on the output shaft, the gearbox supporting a first bearing that supports the output shaft in a rotatable manner; and an electrical rotating machine including: a central shaft that rotates together with the output shaft; a rotor fixed to the central shaft; and a stator surrounding the rotor. The gearbox supports the stator and a second bearing that supports the central shaft of the electrical rotating machine in a rotatable manner.

Claims

1. A marine reduction gear comprising:

an input shaft coupled to a first output shaft that is an output shaft of an engine;

a second output shaft coupled to a propeller shaft that rotates a screw propeller;

a gearbox accommodating an input gear provided on the input shaft and an output gear provided on the second output shaft, the gearbox supporting a first bearing that supports the second output shaft in a rotatable manner; and

an electrical rotating machine including;

a central shaft that rotates together with the second output shaft;

a rotor fixed to the central shaft; and

a stator surrounding the rotor, wherein

the gearbox supports the stator and a second bearing that supports the central shaft of the electrical rotating machine in a rotatable manner.

2. The marine reduction gear according to claim 1, further comprising a lubricating oil pump mounted to the gearbox and driven by the input shaft, wherein

the lubricating oil pump circulates lubricating oil such that the lubricating oil flows downward in the gearbox, and supplies the lubricating oil to the second bearing, and

the lubricating oil supplied to the second bearing is ejected from the second bearing into the gearbox.

3. The marine reduction gear according to claim 1, further comprising a coolant pump mounted to the gearbox and driven by the input shaft, wherein

the coolant pump supplies a coolant to the electrical rotating machine, such that the coolant flows in contact with the stator of the electrical rotating machine.

4. The marine reduction gear according to claim 3, wherein

the coolant pump supplies the coolant to the electrical rotating machine through a first coolant supply line, and supplies the coolant to a heat exchanger through a second coolant supply line, and

the heat exchanger cools the lubricating oil by exchanging heat between the lubricating oil and the coolant, the lubricating oil being the lubricating oil that is to be sucked into the lubricating oil pump or the lubricating oil that has been discharged from the lubricating oil pump.

5. The marine reduction gear according to claim 2, further comprising a coolant pump mounted to the gearbox and driven by the input shaft, wherein

the coolant pump supplies a coolant to the electrical rotating machine, such that the coolant flows in contact with the stator of the electrical rotating machine.

6. The marine reduction gear according to claim 5, wherein

the coolant pump supplies the coolant to the electrical rotating machine through a first coolant supply line, and supplies the coolant to a heat exchanger through a second coolant supply line, and

the heat exchanger cools the lubricating oil by exchanging heat between the lubricating oil and the coolant, the lubricating oil being the lubricating oil that is to be sucked into the lubricating oil pump or the lubricating oil that has been discharged from the lubricating oil pump.