Propulsion apparatus for ship and ship having the same

Patent metadata

Field	Value
Publication number	US-9963211-B2
Application number	US-201314397180-A
Country	US
Kind code	B2
Filing date	Apr 26, 2013
Priority date	Apr 27, 2012
Publication date	May 8, 2018
Grant date	May 8, 2018

Abstract

Provided are a propulsion device for a ship and a ship including the same. The propulsion device for the ship includes: a rear propeller fixed to a rotation shaft; a front propeller that is rotatably supported on the rotation shaft in the front of the rear propeller; at least one bearing interposed in at least one of spaces between a hub of the front propeller and the rotation shaft and between the rotation shaft and a ship body; and an inverse rotation unit that inverts rotation of the rotation shaft, transfers the inverted rotation to the front propeller and includes a gearbox that is accommodated in an installation space formed in a tail of the ship body in a state in which a plurality of gears for implementing inversion of the front propeller are embedded, wherein at least one measurement unit for measuring operating states of the at least one bearing is mounted to the rotation shaft.

First claim

The invention claimed is:

1. A propulsion device for a ship, comprising:
a rear propeller fixed to a rotation shaft;
a front propeller that is rotatably supported on the rotation shaft in the front of the rear propeller;
at least one bearing interposed in at least one of spaces between a hub of the front propeller and the rotation shaft and between the rotation shaft and a ship body; and
an inverse rotation unit that inverts rotation of the rotation shaft, transfers the inverted rotation to the front propeller and comprises a gearbox that is accommodated in an installation space formed in a tail of the ship body in a state in which a plurality of gears for implementing inversion of the front propeller are embedded,
wherein at least one measurement unit for measuring operating states of the at least one bearing is mounted to the rotation shaft,
wherein the at least one bearing comprises:
first and second thrust bearings that support thrust loads applied to the rotation shaft from the front propeller;
a first radial bearing that supports a radial load applied to the rotation shaft from the front propeller;
a second radial bearing that is respectively installed between the rotation shaft and the ship body and supports the rotation shaft in the front of the gearbox; and
at least one of third and fourth thrust bearings that transfer axial forces transferred from the front propeller and the rear propeller to the rotation shaft toward the ship body,
wherein the propulsion device further comprises a generator unit that comprises coils and a magnetic substance installed between the hub of the front propeller and the rotation shaft so as to face each other and that generates electric energy due to opposite rotation of the coils and the magnetic substance when the rotation shaft rotates, and
wherein the electric energy is supplied as an energy source of the measurement unit.

2. The propulsion device of claim 1 , wherein the measurement unit comprises:
a sensor that measures a change in temperatures of the at least one bearing; and
an adaptor in which the sensor is embedded.

3. The propulsion device of claim 2 , wherein the adaptor is formed of a metallic material having thermal conductivity, is disposed in a bell mouth shape, is mounted in a coupling groove formed in the rotation shaft or is disposed as an integral body with the rotation shaft.

4. The propulsion device of claim 2 , further comprising a connection cable that is connected to the sensor and transfers measurement values of the change in temperatures of the at least one bearing to a monitoring unit.

5. The propulsion device of claim 2 , further comprising:
a communication unit that receives the measurement values of the change in temperatures of the at least one bearing from the sensor;
a determination unit that determines whether operations of the at least one bearing are maintained in a normal state based on the received measurement values of the change in temperatures of the at least one bearing; and
a display unit that displays at least one of the measurement values of the change in temperatures of the at least one bearing and a value of the determination result on a screen.

6. The propulsion device of claim 1 , wherein the magnetic substance comprises at least one of a permanent magnet and an electromagnet.

7. The propulsion device of claim 1 , further comprising a cylindrical, first outer support ring and a cylindrical, first inner support ring that are respectively installed between the hub of the front propeller and the rotation shaft,
wherein the first outer support ring is interposed between an outer race of the second thrust bearing and an outer race of the first radial bearing so that the second thrust bearing and the first radial bearing are supported with respect to each other, and
the first inner support ring is interposed between an inner race of the second thrust bearing and an inner race of the first radial bearing so that the second thrust bearing and the first radial bearing are supported with respect to each other.

8. The propulsion device of claim 7 , wherein the plurality of gears comprise:
a driving bevel gear connected to the gearbox so as to be rotated together with the rotation shaft;
a driven bevel gear that is rotatably supported around the rotation shaft and is connected to the hub of the front propeller; and
at least one inversion bevel gear that inverts rotation of the driving bevel gear and transfers inverted rotation to the driven bevel gear.

9. The propulsion device of claim 8 , further comprising:
a connection member that is rotatably supported on an outer side of the rotation shaft and connects the driven bevel gear and the hub of the front propeller; and
a rear inner bearing installed between an inner surface of the connection member and the rotation shaft.

10. The propulsion device of claim 9 , further comprising a cylindrical, second inner support ring and a cylindrical, second outer support ring that are disposed between the connection member and the outer surface of the rotation shaft and support the rear inner bearing,
wherein the second inner support ring is interposed between an inner race of the rear inner bearing and an inner race of the first thrust bearing and maintains a distance therebetween, and
the second outer support ring is installed at an inner surface of the connection member so as to support an outer race of the rear inner bearing.

11. The propulsion device of claim 10 , wherein the coils are wound along an outer circumferential surface and an inner circumferential surface of the second inner support ring, and
the magnetic substance is installed at an inside of the second outer support ring so as to face the coils.

12. The propulsion device of claim 7 , wherein the coils are wound along an outer circumferential surface and an inner circumferential surface of the first inner support ring, and
the magnetic substance is installed at an inside of the first outer support ring so as to face the coils.

13. A ship comprising the propulsion device according to claim 1 .

Assignees

• Samsung Heavy Ind

Inventors

• Oh Se-Myun
• Lee Dong-Hyun
• Park Hyun-Sang
• Chung Sung-Wook
• Jung Jae-Kwon
• Heo Nam-Yong

Classifications

• B63H5/10 Primary

  of coaxial type, e.g. of counter-rotative type · CPC title

• B63H2005/106

  with drive shafts of second or further propellers co-axially passing through hub of first propeller, e.g. counter-rotating tandem propellers with co-axial drive shafts · CPC title

• B63H23/321

  Bearings or seals specially adapted for propeller shafts · CPC title

• F16C2233/00

  Monitoring condition, e.g. temperature, load, vibration · CPC title

• G01K13/00

  Thermometers specially adapted for specific purposes · CPC title