JP5702582B2 - Marine prime mover system - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a marine motor system including an auxiliary power device.

  As a prime mover system for propulsion drive mounted on large ships, the auxiliary power unit is driven by using exhaust gas discharged from the internal prime mover (low speed diesel engine) or electric power generated in the ship. One that reduces the load on the prime mover by connecting to the prime mover has been proposed (see, for example, Patent Document 1). Usually, in such a prime mover system, the output shaft of the auxiliary power unit is connected to the crankshaft of the prime mover via a connection gear.

JP 2006-242051 A

  Here, paying attention to the above-mentioned connecting gear interposed between the auxiliary power unit and the crankshaft, the size thereof depends on the shaft diameters of the output shaft and the crankshaft of the auxiliary power unit, and in particular, the crank having the larger shaft diameter. Depends on the shaft diameter. The shaft diameter of the prime mover mounted on a large vessel is much larger than the shaft diameter of the output shaft of the auxiliary power unit, and as a result, the connecting gear is so large that it is disproportionate to the size of the auxiliary power unit. Will be composed. When the connecting gear becomes large in this way, energy loss increases, and it becomes necessary to secure a wide installation place.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a prime mover system in which a connecting gear interposed between an auxiliary power unit and a prime mover can be configured to be small.

  The present invention has been made in order to solve the above-described problems, and a prime mover system according to the present invention includes a marine prime mover for rotating a propeller shaft, power generation, and the generated power to the prime mover. An auxiliary power unit to be supplied to the motor, and a connecting gear that is interposed between the prime mover and the auxiliary power unit and transmits power from the auxiliary power unit to the prime mover, wherein the prime mover is generated by the prime mover A crankshaft that transmits power to the propeller shaft, and a rotating member that is driven by the crankshaft and has a smaller shaft diameter than the crankshaft, and the power from the auxiliary power unit is transmitted through the connecting gear. Supplied to the rotating member. According to such a configuration, the connecting gear is connected to the rotating member having a smaller shaft diameter than the crankshaft, so that the size of the connecting gear can be suppressed smaller than when connected to the crankshaft.

  In the prime mover system, the prime mover may have a cam shaft that controls a valve of a cylinder in the prime mover, and the cam shaft may be the rotating member.

  Further, in the prime mover system, the prime mover is interposed between a hydraulic oil boosting pump for increasing a pressure of hydraulic oil for controlling a hydraulic drive device, and the crankshaft and the hydraulic oil boosting pump. A transmission mechanism that transmits power from the crankshaft to the pump for boosting hydraulic oil. The transmission mechanism includes a rotation shaft, and the rotation shaft is the rotation member. May be.

  In the prime mover system, the prime mover is interposed between a lubricating oil boosting pump that raises the pressure of the lubricating oil, and between the crankshaft and the lubricating oil boosting pump, and receives power from the crankshaft. A transmission mechanism that transmits to the pump for boosting the lubricating oil. The transmission mechanism may include a rotation shaft, and the rotation shaft may be the rotation member.

  In the prime mover system described above, the auxiliary power unit may be configured to be driven using energy of exhaust gas of the prime mover. According to this configuration, since the exhaust gas of the prime mover can be used effectively, the prime mover can be operated efficiently.

  In the prime mover system described above, the auxiliary power unit may be configured by a power turbine that is rotationally driven by exhaust gas from the prime mover.

  The prime mover system may further include a supercharger that supplies compressed air to the prime mover, and the power turbine may be provided independently of the supercharger. According to such a configuration, even if the power turbine fails, the turbocharger is not affected, so that the operation of the prime mover can be performed without any problem.

  In the prime mover system described above, the auxiliary power unit may be configured to include an electric motor driven by electric power generated by a generator provided in a ship separately from the prime mover. According to such a configuration, surplus electric power obtained by improving the efficiency of the ship can be used effectively, and the generator installed in the ship is not affected by the operating state of the engine. The power can be stably supplied from the auxiliary power unit to the prime mover regardless of the driving conditions.

  In the prime mover system, the electric motor may be configured to be driven by electric power generated by energy of exhaust gas of the prime mover. According to such a configuration, it is possible to effectively use surplus power obtained by improving the efficiency of the ship. Further, since the exhaust gas from the prime mover can be used effectively, the prime mover can be operated efficiently.

  In the prime mover system described above, the auxiliary power unit includes a power turbine that is rotationally driven by exhaust gas from the prime mover, and an electric motor that is driven by electric power generated by a generator provided in a ship separately from the prime mover. You may comprise so that it may consist of. According to such a configuration, the surplus power obtained by improving the efficiency in the ship can be effectively used, and the exhaust gas of the prime mover can be effectively utilized. Therefore, the prime mover can be operated efficiently.

  According to the prime mover system according to the present invention, the size of the connecting gear can be reduced.

1 is a schematic diagram of a prime mover system according to a first embodiment of the present invention. It is the schematic of the motor | power_engine system which concerns on 2nd Embodiment of this invention. It is the schematic of the motor | power_engine system which concerns on 3rd Embodiment of this invention. It is the schematic of the motor | power_engine system which concerns on 4th Embodiment of this invention.

  Hereinafter, an embodiment of a prime mover system according to the present invention will be described with reference to the drawings. Below, the same code | symbol is attached | subjected to the element which is the same or it corresponds through all the drawings, and the overlapping description is abbreviate | omitted.

(First embodiment)
First, the configuration of the prime mover system 100 according to the first embodiment of the present invention will be described with reference to FIG. As shown in FIG. 1, the prime mover system 100 according to the present embodiment includes a prime mover 10, a supercharger 20, an auxiliary power device 30, and a connecting gear 40. Furthermore, the prime mover 10 has a crankshaft 50 and a camshaft 60. Hereinafter, each of these components will be described. In the following, a gear as a mechanical element is referred to as a “gear element” and is distinguished from a “gear” as a power transmission device.

  The prime mover 10 is a central device of the prime mover system 100. The prime mover 10 according to the present embodiment is for rotating a propeller shaft 91 having a propeller 90 attached to the tip. The prime mover 10 according to this embodiment is a so-called low speed diesel engine. Main components of the prime mover 10 will be described below.

  The crankshaft 50 is a member for outputting the power generated by the prime mover 10 to the outside. The crankshaft 50 is connected to a plurality of pistons 11 and is driven by the reciprocating motion of the pistons 11 accompanying the explosion of fuel in the cylinders 12. Further, the exhaust gas in the cylinder 12 is discharged to the exhaust pipe 13, and scavenging air is supplied into the cylinder 12 from the scavenging pipe 14. The exhaust pipe 13 and the scavenging pipe 14 are both formed in a tank shape.

  The camshaft 60 is a member that controls the valve of the cylinder 12 in synchronization with the rotation of the crankshaft 50. As described above, exhaust gas and scavenging air enter and exit the cylinder 12. A valve (not shown) for controlling the exhaust is driven by the cam shaft 60. The camshaft 60 is connected to the crankshaft 50 via a power transmission device 61 such as a chain or gear element, and rotates at the same rotational speed as the rotational speed of the crankshaft 50.

  The supercharger 20 is a device for supplying compressed air to the prime mover 10. The supercharger 20 has a turbine part 21, a compressor part 22, and a shaft part 23. Exhaust gas is supplied to the turbine unit 21 from the exhaust pipe 13 via the exhaust line 15, and the turbine unit 21 rotates by the velocity energy of the exhaust gas. The turbine part 21 and the compressor part 22 are connected by a shaft part 23, and the compressor part 22 also rotates as the turbine part 21 rotates. When the compressor unit 22 rotates, the air taken from the outside is compressed, and the compressed air is supplied to the scavenging pipe 14 via the air supply line 16. The compressed air in the scavenging pipe 14 is supplied into the cylinder 12. Thus, by supplying a large amount of air into the cylinder 12, a large amount of fuel can be supplied, and as a result, the output of the prime mover 10 can be increased.

  The auxiliary power device 30 is a device for reducing a load on the prime mover 10 by bearing a part of the load on the prime mover 10. The auxiliary power unit 30 according to the present embodiment is a so-called power turbine. The auxiliary power unit 30 includes a turbine unit 31 and an output shaft 32. Exhaust gas is supplied to the turbine unit 31 from the exhaust pipe 13 of the prime mover 10 via the exhaust line 17, and the turbine unit 31 is rotationally driven by the velocity energy of the exhaust gas. The output shaft 32 rotates with the rotation of the turbine unit 31 and supplies the power generated by the turbine unit 31 to the connection gear 40.

  Unlike the above configuration, the supercharger 20 itself may be used as an auxiliary power unit by taking out the output from the supercharger 20 or the like. However, it is desirable that a power turbine is provided separately from the supercharger 20 as in the present embodiment, and this is used as the auxiliary power unit 30. This is because if the auxiliary power unit 30 is provided independently of the supercharger 20, the risk of stopping the supercharger 20 due to the malfunction of the auxiliary power unit 30 can be reduced. For example, the prime mover 10 according to the present embodiment is not capable of regular operation unless the supercharger 20 operates normally. However, by making the auxiliary power unit 30 independent of the supercharger 20, the auxiliary power unit temporarily Even if 30 breaks down, the operation of the prime mover 10 itself can be maintained.

  The connection gear 40 is a device that transmits the power of the auxiliary power device 30 to the prime mover 10. The connection gear 40 according to the present embodiment includes a speed reducer 41 disposed outside the prime mover 10 and an additional gear 46 disposed inside the prime mover 10. Among these, the output shaft 32 of the auxiliary power unit 30 is connected to the input side of the speed reducer 41, and the additional gear 46 is connected to the output side. Thereby, the speed reducer 41 decelerates the power from the auxiliary power unit 30 and supplies it to the additional gear 46. The input side of the additional gear 46 is connected to the output shaft 42 of the speed reducer 41, and the output side is connected to the cam shaft 60. Thereby, the additional gear 46 supplies the power of the auxiliary power unit 30 input from the speed reducer 41 to the camshaft 60. Since the camshaft 60 is connected to the crankshaft 50 via a power transmission device 61 such as a chain or gear element, a part of the load of the prime mover 10 (crankshaft 50) is the power of the auxiliary power device 30. Will be reduced.

  The above is the configuration of the prime mover system 100 according to the present embodiment. As described above, the size of the additional gear 46 constituting a part of the connecting gear 40 is formed based on the shaft diameter of the shaft connected to the input side and the output side. Here, the cam shaft 60 is usually configured such that its shaft diameter is much smaller than the shaft diameter of the crankshaft 50. For example, when the shaft diameter of the camshaft 60 is about 300 mm, the shaft diameter of the crankshaft 50 is configured to be about 850 mm (however, if the type of the prime mover 10 is changed, the shaft diameter of the camshaft 60 and the crankshaft Of course, the shaft diameter of 50 also changes). Therefore, when the output side of the connecting gear 40 is connected to the camshaft 60 as in this embodiment, the size of the additional gear 46 is much larger than when the connecting gear 40 is connected to the crankshaft 50 as in the prior art. Therefore, the overall size of the connecting gear 40 can be kept small.

(Second Embodiment)
Next, a prime mover system 200 according to a second embodiment of the present invention will be described with reference to FIG. The prime mover 10 of the prime mover system 200 according to the present embodiment does not have the camshaft 60 (see FIG. 1) in the first embodiment, but instead has a hydraulic oil boosting pump 70 and a connection mechanism 80. The configuration differs from the prime mover system 100 according to the first embodiment. In addition, with this difference, the configuration of the connection gear 40 according to the present embodiment is also different from that of the prime mover system 100. Hereinafter, these components will be described in order.

  The hydraulic pressure boosting pump 70 is a device that increases the pressure of hydraulic fluid that controls the prime mover 10. In the prime mover system 100 according to the first embodiment, the valve (not shown) in the cylinder 12 is driven by the cam shaft 60, but in the prime mover system 200 according to the present embodiment, the valve is driven by hydraulic oil. The hydraulic oil drives a fuel pump (not shown) that supplies fuel into the cylinder 12. In some cases, a hydraulic drive device that is not provided in the prime mover 10 such as a pump in a ship may be driven. In recent years, a large number of prime mover systems for large vessels are increasing that the control of the prime mover 10 is performed by the above-described hydraulic oil instead of the camshaft.

  The coupling mechanism 80 is a mechanism for transmitting the power of the crankshaft 50 to the hydraulic oil boosting pump 70 described above. The coupling mechanism 80 is configured by combining a chain, a sprocket, a rotating shaft, a gear element, and the like. One end side of the connection mechanism 80 is connected to the crankshaft 50, and the other end side is connected to the input shaft 71 of the hydraulic oil boosting pump 70. As a result, the coupling mechanism 80 receives power from the crankshaft 50 and transmits it to the hydraulic oil boosting pump 70 to rotate the hydraulic oil boosting pump 70. A combination of a chain, a sprocket, a rotating shaft, a gear element, and the like constituting the coupling mechanism 80 is not particularly limited. In this embodiment, a sprocket 81 is attached to the crankshaft 50, and the chain 82 is hung on the sprocket 81. The other sprocket 83 is configured to rotate. Then, the sprocket 83 that has been rotated rotates the gear element 85 located on the opposite side via the rotation shaft 84 and, if necessary, the input shaft 71 of the hydraulic oil boosting pump 70 via the plurality of gear elements. Driving. In FIG. 2, the sprocket 81 attached to the crankshaft 50 is positioned on the propeller shaft 91 side when viewed from the piston 11, but may be positioned on the side opposite to the propeller shaft 91 when viewed from the piston 11. .

  Further, the connection gear 40 according to the present embodiment includes the reduction gear 41 and the additional gear 46, but the gear element 85 that is a part of the connection mechanism 80 forms a part of the additional gear 46. Yes. Like this embodiment, the gear element which comprises the connection gear 40 does not need to be used only for the connection gear 40, and may be a part of gears other than the connection gear 40. FIG. The input side (auxiliary power device 30 side) of the additional gear 46 is connected to the output shaft 42 of the speed reducer 41, and the output side (prime motor 10 side) is connected to the rotation shaft 84 of the connection mechanism 80. Thus, the additional gear 46 supplies the power of the auxiliary power device 30 input from the speed reducer 41 to the rotating shaft 84 of the coupling mechanism 80. Since the rotary shaft 84 is connected to the crankshaft 50 via the chain 82 and the like, a part of the load of the prime mover 10 (crankshaft 50) is reduced by the power of the auxiliary power unit 30. .

  The above is the configuration of the prime mover system 200 according to the present embodiment. Here, the rotating shaft 84 of the coupling mechanism 80 is configured so that its shaft diameter is much smaller than the shaft diameter of the crankshaft 50. Therefore, when the output side of the connection gear 40 is connected to the rotating shaft 84 of the connection mechanism 80 as in the present embodiment, the additional gear 46 is compared to the case where the output side of the connection gear 80 is connected to the crankshaft 50 as in the prior art. The size can be kept much smaller, and consequently the size of the entire connecting gear 40 can be kept small. From another viewpoint, since the additional gear 46 shares the gear element 85 with the coupling mechanism 80, the additional gear 46 can substantially omit the gear element 85. Therefore, the additional gear 46 can be kept small, and consequently the entire connecting gear 40 can be kept small.

  As described above, the rotating member connected to the output side of the connecting gear 40 does not have to be the cam shaft 60 as in the first embodiment, and is a rotating member that is driven by the crankshaft 50 and has a smaller shaft diameter than the crankshaft 50. If so, the rotating shaft 84 of the coupling mechanism 80 as in this embodiment may be used. As the rotating member connected to the connecting gear 40, an existing member (part) necessary for driving the prime mover may be used, and it is not necessary to provide a rotating member only for connecting to the connecting gear 40.

  The coupling mechanism 80 of the present embodiment transmits the power of the crankshaft 50 to the hydraulic oil boosting pump 70, but the coupling mechanism 80 transmits the power to a device other than the hydraulic oil boosting pump 70. It may be a thing. For example, the prime mover 10 may have a lubricating oil boosting pump that raises the pressure of the lubricating oil necessary to drive the prime mover 10, but the coupling mechanism 80 uses the power of the crankshaft 50 to drive the lubricating oil. It may be transmitted to a boosting pump.

(Third embodiment)
Next, a prime mover system 300 according to a third embodiment of the present invention will be described with reference to FIG. The prime mover system 300 according to the present embodiment differs from the prime mover system 100 according to the first embodiment in that the auxiliary power device 30 is an electric motor. The other points are basically the same as the configuration of the prime mover system 100 according to the first embodiment. More specifically, it is as follows.

  As described above, the auxiliary power device 30 of this embodiment is an electric motor, and includes the electric motor main body 33 and the output shaft 34. Although the electric motor main body 33 is driven by electric power, the electric power of the electric motor main body 33 may be generated by a generator provided in the ship separately from the prime mover 10 described above. The power may be generated by using or may be a combination of these. Among these, when generating power using the energy of the exhaust gas, the exhaust gas may be directly taken out from the exhaust pipe 13, and the power generation turbine may be rotated by the kinetic energy of the exhaust gas, or may be taken out from the supercharger 20. Steam may be generated by the thermal energy of the exhaust gas, and a power generation steam turbine may be rotated to generate power. Moreover, you may generate electric power by taking out motive power from the supercharger 20 and driving a generator. The output shaft 34 rotates with the rotation of the electric motor main body 33 and outputs the power generated by the electric motor main body 33 to the connecting gear 40.

  Even when an electric motor is used for the auxiliary power unit 30 as in the prime mover system 300 according to the present embodiment, the power from the auxiliary power unit 30 has a shaft diameter larger than that of the crankshaft 50 via the connecting gear 40. If it is configured to transmit to a small rotating member (cam shaft 60), the size of the connecting gear 40 can be kept small. Further, if the electric power for driving the electric motor main body 33 is generated by a generator provided in the ship, the obtained surplus electric power can be used effectively. Further, in this case, since the generator provided in the ship is not affected by the driving condition of the prime mover, the power from the auxiliary power unit 30 is stably supplied to the prime mover 10 regardless of the driving condition of the prime mover 10. can do. Furthermore, if the electric power that drives the electric motor main body 33 is generated using the energy of the exhaust gas, the exhaust gas of the prime mover 10 can be used effectively, and therefore the prime mover 10 can be operated efficiently.

(Fourth embodiment)
Next, a prime mover system 400 according to a fourth embodiment of the present invention will be described with reference to FIG. The prime mover system 400 according to the present embodiment is different from the prime mover system 100 according to the first embodiment in that the auxiliary power device 30 includes a power turbine and an electric motor. The other points are basically the same as the configuration of the prime mover system 100 according to the first embodiment. More specifically, it is as follows.

  As described above, the auxiliary power device 30 according to the present embodiment includes a power turbine and an electric motor. The auxiliary power unit 30 includes a turbine unit 31, an output shaft 32 coupled to the turbine unit 31, an electric motor main body 33, and an output shaft 34 coupled to the electric motor main body 33, respectively. The turbine unit 31, the output shaft 32, the electric motor main body 33, and the output shaft 34 described in the embodiment are the same. The output shaft 32 on the power turbine side rotates with the rotation of the turbine unit 31, and outputs the power generated by the turbine unit 31 to the connection gear 40. The output shaft 34 on the electric motor side rotates with the rotation of the electric motor main body 33, and outputs the power generated by the electric motor main body 33 to the connecting gear 40.

  In the present embodiment, exhaust gas is supplied to the turbine unit 31 from the exhaust pipe 13 of the prime mover 10 via the exhaust line 17, and the turbine unit 31 is rotationally driven by the velocity energy of the exhaust gas. Further, the electric motor main body 33 is supplied with electric power generated by a generator provided in the ship separately from the prime mover 10, and the electric motor main body 33 is rotationally driven by this electric power.

  Even when the auxiliary power unit 30 is configured by a power turbine and an electric motor as in the prime mover system 400 according to the present embodiment, the power from the auxiliary power unit 30 is transmitted through the connecting gear 40 to the crankshaft 50. The size of the connecting gear 40 can be kept small if it is configured to transmit to a rotating member (cam shaft 60) having a smaller shaft diameter. Furthermore, according to the prime mover system 400 according to the present embodiment, the turbine unit 31 is driven using exhaust gas, so that the prime mover 10 can operate efficiently, and the electric motor main body 33 is installed in the ship. The surplus power obtained by being driven by the power generated by the generator can be used effectively, and stable power can be supplied from the auxiliary power unit 30 to the connecting gear 40 regardless of the state of the prime mover 10. You can get two benefits at the same time.

  The first to fourth embodiments according to the present invention have been described above with reference to the drawings. However, the specific configuration is not limited to these embodiments, and the design can be changed without departing from the gist of the present invention. And the like are included in the present invention. For example, as described above, the auxiliary power unit 30 has been described using a power turbine, an electric motor, and a combination thereof. However, the auxiliary power unit is not limited thereto. For example, the present invention includes devices using devices other than those described above as auxiliary power devices, such as using a hydraulic motor as an auxiliary power device.

  In the above description, the connecting gear 40 is composed of the reduction gear 41 and the additional gear 46. However, the reduction gear 41 may be integrated with the reduction gear 41. The connecting gear may be configured by omitting. Further, in the above, the additional gear 46 which is a part of the connection gear 40 is located inside the prime mover 10. However, if the connection gear 40 is functionally interposed between the auxiliary power unit 30 and the prime mover 10, The specific installation position of the connecting gear 40 is not particularly limited.

  According to the prime mover system of the present invention, the size of the connecting gear interposed between the prime mover and the auxiliary power unit can be reduced, which is advantageous in the technical field of the prime mover system including the auxiliary power unit.

DESCRIPTION OF SYMBOLS 10 Motor | power_engine 20 Supercharger 30 Auxiliary power unit 31 Turbine part 33 Electric motor main body 40 Connection gear 50 Crankshaft 60 Camshaft (rotating member)
70 Hydraulic oil boosting pump 80 Connection mechanism 84 Rotating shaft (Rotating member)
91 Propeller shaft 100, 200, 300, 400 Motor system

Claims (8)

A marine motor for rotating the propeller shaft,
An auxiliary power unit that generates power and supplies the generated power to the prime mover;
A coupling gear that is interposed between the prime mover and the auxiliary power unit and transmits power from the auxiliary power unit to the prime mover;
The prime mover is
A crankshaft for transmitting the power generated by the prime mover to the propeller shaft;
A rotating member driven by the crankshaft and having a smaller shaft diameter than the crankshaft,
Power from the auxiliary power device is supplied to the rotating member via the connection gear,
The prime mover is
A hydraulic oil booster pump for increasing the pressure of the hydraulic oil for controlling the hydraulic drive device;
A transmission mechanism interposed between the crankshaft and the hydraulic oil pressure boosting pump and transmitting power from the crankshaft to the hydraulic oil pressure boosting pump;
The transmission mechanism includes a rotating shaft,
A prime mover system in which the rotating shaft is the rotating member. A marine motor for rotating the propeller shaft,
An auxiliary power unit that generates power and supplies the generated power to the prime mover;
A coupling gear that is interposed between the prime mover and the auxiliary power unit and transmits power from the auxiliary power unit to the prime mover;
The prime mover is
A crankshaft for transmitting the power generated by the prime mover to the propeller shaft;
A rotating member driven by the crankshaft and having a smaller shaft diameter than the crankshaft,
Power from the auxiliary power device is supplied to the rotating member via the connection gear,
The prime mover is
A lubricating oil booster pump that increases the pressure of the lubricating oil;
A transmission mechanism interposed between the crankshaft and the lubricating oil boosting pump, and transmitting power from the crankshaft to the lubricating oil boosting pump;
The transmission mechanism includes a rotating shaft,
A prime mover system in which the rotating shaft is the rotating member. The prime mover system according to claim 1 , wherein the auxiliary power unit is driven by using energy of exhaust gas of the prime mover. The prime mover system according to claim 1 , wherein the auxiliary power unit is a power turbine that is rotationally driven by exhaust gas of the prime mover. A supercharger for supplying compressed air to the prime mover;
The prime mover system according to claim 4 , wherein the power turbine is provided independently of the supercharger. A marine motor for rotating the propeller shaft,
An auxiliary power unit that generates power and supplies the generated power to the prime mover;
A coupling gear that is interposed between the prime mover and the auxiliary power unit and transmits power from the auxiliary power unit to the prime mover;
The prime mover is
A crankshaft for transmitting the power generated by the prime mover to the propeller shaft;
A rotating member driven by the crankshaft and having a smaller shaft diameter than the crankshaft,
Power from the auxiliary power device is supplied to the rotating member via the connection gear,
The auxiliary power unit is a prime mover system comprising an electric motor driven by electric power generated by a generator provided in a ship separately from the prime mover. A marine motor for rotating the propeller shaft,
An auxiliary power unit that generates power and supplies the generated power to the prime mover;
A coupling gear that is interposed between the prime mover and the auxiliary power unit and transmits power from the auxiliary power unit to the prime mover;
The prime mover is
A crankshaft for transmitting the power generated by the prime mover to the propeller shaft;
A rotating member driven by the crankshaft and having a smaller shaft diameter than the crankshaft,
Power from the auxiliary power device is supplied to the rotating member via the connection gear,
The auxiliary power unit is a prime mover system including an electric motor driven by electric power generated by energy of exhaust gas of the prime mover. A marine motor for rotating the propeller shaft,
An auxiliary power unit that generates power and supplies the generated power to the prime mover;
A coupling gear that is interposed between the prime mover and the auxiliary power unit and transmits power from the auxiliary power unit to the prime mover;
The prime mover is
A crankshaft for transmitting the power generated by the prime mover to the propeller shaft;
A rotating member driven by the crankshaft and having a smaller shaft diameter than the crankshaft,
Power from the auxiliary power device is supplied to the rotating member via the connection gear,
The auxiliary power device includes a power turbine that is rotationally driven by exhaust gas from the prime mover, and an electric motor system that is driven by electric power generated by a power generator provided in a ship separately from the prime mover.

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