Saildrive and ships

Abstract

This technology provides a way to avoid overheating of the sail drive even if the orientation of the upper unit relative to the lower unit is changed. [Solution] The sail drive comprises a lower unit, an upper unit positioned above the lower unit and oriented in a manner that allows for repositioning relative to the lower unit, and an intermediate unit positioned between the lower unit and the upper unit. The refrigerant flowing between the lower unit and the upper unit via the intermediate unit is cooled in the lower unit. The intermediate unit switches the flow path of the refrigerant.

Description

Technical Field

[0001] The present invention relates to a sail drive and a ship.

Background Art

[0002] Patent Document 1 discloses a marine propulsion unit in which lubricating oil circulates internally. The lubricating oil circulates to ensure lubrication and heat exchange for each part (such as gears) of the propulsion unit.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In recent years, in order to improve the mountability on a ship, a sail drive (propulsion unit) has been proposed in which an upper unit constituting the upper part of the sail drive can be arranged, for example, in the reverse front-back direction with respect to a lower unit constituting the lower part of the sail drive. However, when the arrangement direction of the upper unit is changed, for example, the flow path of the lubricating oil as a refrigerant flowing inside the sail drive is also changed, and the lubricating oil may become difficult to circulate. As a result, the cooling of the lubricating oil in the lower unit becomes insufficient, and there is a risk that the sail drive overheats.

[0005] The present invention has been made to solve the above problems, and an object thereof is to provide a technique capable of avoiding overheating of a sail drive even when the arrangement direction of an upper unit with respect to a lower unit is changed.

Means for Solving the Problems

[0006] A sail drive according to one aspect of the present invention comprises a lower unit, an upper unit positioned above the lower unit and oriented so as to be changeable relative to the lower unit, and an intermediate unit positioned between the lower unit and the upper unit, wherein a refrigerant flowing between the lower unit and the upper unit via the intermediate unit is cooled in the lower unit, and the intermediate unit switches the flow path of the refrigerant.

[0007] A vessel relating to another aspect of the present invention is equipped with the above-described sail drive. [Effects of the Invention]

[0008] With the above configuration, even if the orientation of the upper unit relative to the lower unit is changed, overheating of the sail drive can be avoided. [Brief explanation of the drawing]

[0009] [Figure 1] This is an explanatory diagram showing the general configuration of a vessel according to one embodiment of the present invention. [Figure 2] This is a side view showing the general configuration of the sail drive installed on the above-mentioned vessel. [Figure 3] This is an explanatory diagram illustrating the change in the orientation of the adapter for the sail drive shown above. [Figure 4] This is a schematic cross-sectional view of the lower unit when the sail drive is positioned facing forward. [Figure 5] This is a schematic cross-sectional view of the lower unit when the sail drive is positioned facing rearward. [Figure 6] This is a top-down perspective view showing the configuration of the intermediate unit of the sail drive described above, broken down vertically. [Figure 7] This is a perspective view from below showing the configuration of the above intermediate unit broken down vertically. [Figure 8] This is a plan view of the upper member included in the above intermediate unit. [Figure 9] This is a plan view of the lower member included in the above intermediate unit. [Figure 10] This is an explanatory diagram illustrating the flow of refrigerant when the intermediate components included in the above-mentioned intermediate unit are arranged on the left and right sides. [Figure 11] This is an explanatory diagram illustrating the flow of the refrigerant when the sail drive is positioned facing backward and the intermediate component is positioned front to back. [Figure 12] This is a top-down perspective view showing a modified configuration of the above-mentioned intermediate unit, disassembled vertically. [Figure 13] This is a plan view showing the configuration of the internal components included in a modified example of the intermediate unit described above. [Figure 14] This is an explanatory diagram illustrating the flow of the refrigerant when the sail drive is positioned facing backward. [Figure 15] This is an overhead perspective view showing another configuration of a modified version of the above intermediate unit, disassembled vertically. [Modes for carrying out the invention]

[0010] Embodiments of the present invention will be described below with reference to the drawings.

[0011] [1. General Structure of the Ship] Figure 1 is an explanatory diagram showing the schematic configuration of a vessel 1 according to one embodiment of the present invention. For the sake of explanation, directions are defined as follows in this specification: The bow side of the vessel 1 is "forward," and the stern side is "rear." Also, as viewed from the perspective of the helmsman (pilot) who is on board the vessel 1 facing forward, the left side is "left," and the right side is "right." Furthermore, the direction of gravity perpendicular to the longitudinal and lateral directions is defined as the up and down direction, with the upstream side of the direction of gravity being "up," and the downstream side being "down." In the drawings, forward is indicated by the symbol "F," rear by "B," left by "L," right by "R," upward by "U," and downward by "D," as necessary.

[0012] The ship 1 is composed of, for example, a sailing ship. The ship 1 (sailing ship) sails by utilizing the wind force received by the sail 2. However, when the ship 1 is entering or leaving the port, in an emergency, etc., it moves mechanically by driving the sail drive 3 mounted on the ship 1 to rotate the propeller 3a. That is, the ship 1 includes a sail drive 3 which is a propulsion device for generating the propulsion force of the ship 1. In particular, the sail drive 3 is attached to the bottom 1a of the ship 1. Hereinafter, the configuration of the sail drive 3 of the present embodiment will be described.

[0013] [2. Configuration of Sail Drive] FIG. 2 is a side view showing a schematic configuration of the sail drive 3. In the drawings after FIG. 2, for the sake of convenience, the illustration of the propeller 3a shown in FIG. 1 is omitted.

[0014] The sail drive 3 includes an upper unit 31, a lower unit 32, and an intermediate unit 33. The upper unit 31 is located on the upper side of the sail drive 3. The lower unit 32 is located on the lower side of the sail drive 3. Specifically, the lower unit 32 is disposed below the upper unit 31. That is, the upper unit 31 is disposed above the lower unit 32. Further, the upper unit 31 is connected to the lower unit 32 via the intermediate unit 33. That is, the intermediate unit 33 is disposed between the upper unit 31 and the lower unit 32 in the vertical direction. The configuration of the intermediate unit 33 will be described later.

[0015] The upper unit 31 has an electric motor 31a, a pump 31b, an adapter 31c, a flange 31d, and a lid body 31e.

[0016] The electric motor 31a is driven by electric power supplied from a battery unit (not shown) mounted on the ship 1 (see FIG. 1) via an inverter (not shown). The above-mentioned inverter is mounted on the adapter 31c together with the electric motor 31a, converts the DC voltage supplied from the above-mentioned battery unit into an AC voltage, and supplies it to the electric motor 31a.

[0017] The electric motor 31a is the power source for the sail drive 3. In other words, the sail drive 3 in this embodiment is an electric sail drive. However, the power source for the sail drive 3 is not limited to the electric motor 31a, but may be an engine such as a gasoline engine or a diesel engine.

[0018] Pump 31b draws in and circulates the oil, which will be used as the refrigerant CL (see Figure 4) flowing inside the sail drive 3. Pump 31b is composed of a hydraulic pump such as a gear pump. However, the configuration of pump 31b is not limited to the above, and it may be a hydraulic pump other than a gear pump.

[0019] The adapter 31c is composed of a metal member extending horizontally. More specifically, the adapter 31c has a projection 31c1 that protrudes in one direction included in the horizontal direction. In Figure 2, the adapter 31c is positioned so that the projection 31c1 protrudes forward. Note that the composition of the adapter 31c is not limited to the above, and it may be made of a resin member, for example.

[0020] An electric motor 31a and a pump 31b are mounted on the upper surface of the adapter 31c. A cover 31e is also detachably attached to the upper surface of the adapter 31c. More specifically, the cover 31e is attached to the adapter 31c so as to cover the electric motor 31a and the pump 31b from above. The lower surface of the adapter 31c is connected to the upper part of the lower unit 32 by bolts B1 via an intermediate unit 33. The adapter 31c is also supported by a flange 31d via a vibration-damping member 31f.

[0021] The vibration-damping member 31f is composed of an elastic material (for example, rubber). In this embodiment, two vibration-damping members 31f are provided on the side where the protrusion 31c1 is located, and one vibration-damping member 31f is provided on the side opposite to the side where the protrusion 31c1 is located. In other words, three vibration-damping members 31f are provided. However, the number of vibration-damping members 31f is not limited to three; for example, there may be one, two, or four or more.

[0022] The flange 31d is composed of a metal member extending horizontally. However, the composition of the flange 31d is not limited to the above, and it may be made of a resin member, for example. The lower surface of the flange 31d is connected to the bottom 1a of the ship 1 via a sealing member 31g (see Figure 4, described later), such as a diaphragm. A hole 1a1 (see Figure 4, described later) is formed in the bottom 1a. The lower unit 32 and the intermediate unit 33 fit into this hole 1a1. Therefore, the lower unit 32 is positioned to protrude downward from the bottom 1a. In addition, the sealing member 31g prevents seawater from flowing into the interior of the ship 1 through the hole 1a1.

[0023] Furthermore, the adapter 31c is configured to be positioned in reverse relative to the lower unit 32 (and intermediate unit 33). More details are as follows. Figure 3 is an explanatory diagram illustrating the change in the positioning direction of the adapter 31c relative to the lower unit 32.

[0024] Even if the adapter 31c is positioned with its protruding portion 31c1 projecting towards the rear, the adapter 31c (its lower surface) can be connected to the upper part of the lower unit 32 via the intermediate unit 33 by bolts B1 (see the right-hand diagram in Figure 3 in particular). As described above, the flange 31d supports the adapter 31c via the vibration-damping member 31f. Therefore, if the orientation of the adapter 31c relative to the lower unit 32 is changed, the orientation of the flange 31d relative to the lower unit 32 is also changed. Furthermore, as described above, the adapter 31c is equipped with an electric motor 31a, a pump 31b, etc., so if the orientation of the adapter 31c relative to the lower unit 32 is changed, the orientation of these devices relative to the lower unit 32 is also changed. Consequently, if the orientation of the adapter 31c relative to the lower unit 32 is changed, the orientation of the entire upper unit 31 is changed. In other words, the upper unit 31 is positioned so that its orientation can be changed relative to the lower unit 32.

[0025] In this embodiment, the arrangement in which the protruding portion 31c1 is positioned to protrude forward (see the left diagram in Figure 3) is referred to as the "forward-facing arrangement." Conversely, the arrangement in which the protruding portion 31c1 is positioned to protrude backward (see the right diagram in Figure 3) is referred to as the "rearward-facing arrangement."

[0026] Furthermore, in this embodiment, the upper unit 31 is configured to be positioned with the front and back reversed relative to the lower unit 32, that is, rotated 180 degrees around an axis along the vertical direction, but the configuration is not limited to this. For example, the upper unit 31 may be configured to be positioned with the upper unit 32 rotated 90 degrees around an axis along the vertical direction. In other words, the protruding portion 31c1 may be positioned to protrude to the left or to the right.

[0027] The configuration of the lower unit 32 will be explained with reference to Figures 4 and 5. Figure 4 is a schematic cross-sectional view of the lower unit 32 in a forward-facing configuration. Figure 5 is a schematic cross-sectional view of the lower unit 32 in a rearward-facing configuration. In the drawings from Figure 4 onward, the flow of the refrigerant CL, which will be described later, is indicated by thick arrows as needed.

[0028] The lower unit 32 includes a drive shaft 32a, a propeller shaft 32b, and a housing 32c. The drive shaft 32a and the propeller shaft 32b are rotatably supported by bearings 32BR within the housing 32c, which extends in the vertical direction.

[0029] The drive shaft 32a is composed of a rod-shaped metal member that extends vertically. The upper end of the drive shaft 32a protrudes upward from the housing 32c. The upper end of the drive shaft 32a is also connected to the rotating shaft (not shown) of the electric motor 31a (see Figure 2, etc.). A first gear 32a1 is attached to the lower end of the drive shaft 32a. The first gear 32a1 is composed of, for example, a bevel gear.

[0030] The propeller shaft 32b is composed of a rod-shaped metal member extending in the front-rear direction. A second gear 32b1 is attached to the propeller shaft 32b near its center in the front-rear direction. The second gear 32b1 is, for example, a bevel gear and meshes with the first gear 32a1. The rear end of the propeller shaft 32b protrudes rearward from the housing 32c. A propeller 3a (see Figure 1) is attached to the rear end of the propeller shaft 32b.

[0031] When the electric motor 31a is driven, the rotational power of the electric motor 31a is transmitted to the propeller shaft 32b via the drive shaft 32a, the first gear 32a1, and the second gear 32b1, causing the propeller shaft 32b to rotate. This causes the propeller 3a to rotate, generating thrust for the vessel 1, and enabling the vessel 1 to sail.

[0032] The lower unit 32 further includes a lower flow path 32P through which the refrigerant CL flows, and a water channel 32W through which seawater from outside the lower unit 32 passes. The lower flow path 32P and the water channel 32W are located within the housing 32c. In other words, the lower flow path 32P and the water channel 32W are provided in the lower unit 32.

[0033] The lower channel 32P comprises a first lower channel 32P1, a second lower channel 32P2, and a connecting portion 32P3. The first lower channel 32P1 and the second lower channel 32P2 are formed extending in the vertical direction. The first lower channel 32P1 is located near the center in the front-rear direction of the lower unit 32, and the second lower channel 32P2 is located in front of the first lower channel 32P1. The first lower channel 32P1 and the second lower channel 32P2 are connected via a connecting portion 32P3 located below the first lower channel 32P1 and the second lower channel 32P2.

[0034] Furthermore, a bearing 32BR that rotatably supports the drive shaft 32a is located in the first lower passage 32P1. The connecting portion 32P3 is located in a bearing 32BR that rotatably supports the propeller shaft 32b, a first gear 32a1 attached to the drive shaft 32a, and a second gear 32b1 attached to the propeller shaft 32b.

[0035] Furthermore, a lower channel inlet 32Pi opening upward is provided at the upper end of the first lower channel 32P1. More specifically, the lower channel inlet 32Pi includes a first lower channel inlet 32Pi1 and a second lower channel inlet 32Pi2. A bearing 32BR supporting the drive shaft 32a is located in the second lower channel inlet 32Pi2, and the drive shaft 32a is inserted through it. On the other hand, components such as the bearing 32BR are removed from the first lower channel inlet 32Pi1 (i.e., no components are placed in the first lower channel inlet 32Pi1). Also, a lower channel outlet 32Po opening upward is provided at the upper end of the second lower channel 32P2. In other words, the lower channel 32P includes a lower channel inlet 32Pi and a lower channel outlet 32Po.

[0036] In this embodiment, oil is used as the refrigerant CL flowing through the lower passage 32P. The oil as the refrigerant CL exhibits a cooling function that cools the components located in the lower passage 32P (e.g., bearing 32BR). The oil as the refrigerant CL also exhibits a lubricating function. The above-mentioned lubricating function means reducing wear and friction at the contact point between two relatively moving components and making their relative motion smoother. Examples of the two components include a first gear 32a1 and a second gear 32b1. In the case of bearing 32BR, examples include an inner ring or outer ring and balls. The oil as the refrigerant CL may be, for example, gear oil. Note that the refrigerant CL is not limited to oil in terms of its cooling function, and may also be, for example, water (cooling water).

[0037] The water channel 32W is located in an annular shape with respect to the lower flow channel 32P, radially outward from the drive shaft 32a via a partition wall 32T. The water channel 32W is connected to a water inlet 32c1 located at the front of the bottom of the housing 32c. The water channel 32W is also connected to a communication hole 32c2 (see also Figure 2) located at the rear of the side of the housing 32c. As a result, seawater from outside the lower unit 32 is drawn into the water channel 32W through either the water inlet 32c1 or the communication hole 32c2. Conversely, seawater in the water channel 32W is discharged to the outside of the lower unit 32 through the other of the water inlet 32c1 or the communication hole 32c2. In other words, the intake of seawater into the water channel 32W can be either the water inlet 32c1 or the communication hole 32c2.

[0038] In this embodiment, there are three communication holes 32c2, but the number of communication holes 32c2 is not limited to three. For example, there may be one, two, or four or more communication holes 32c2.

[0039] Heat exchange occurs between the seawater flowing through the water channel 32W and the refrigerant CL flowing through the lower channel 32P via the partition wall 32T. Since the temperature of the seawater is normally lower than the temperature of the refrigerant CL, the refrigerant CL is cooled by the above heat exchange. In other words, the refrigerant CL is cooled in the lower unit 32.

[0040] Furthermore, the lower channel 32P is connected to the upper channel 31P of the upper unit 31 via the intermediate unit 33. More specifically, the upper channel 31P is composed of a first upper channel 31P1 and a second upper channel 31P2. The first upper channel 31P1 and the second upper channel 31P2 are formed in the adapter 31c, respectively.

[0041] The first upper channel 31P1 extends upward from the lower surface of the adapter 31c, then bends to one side in the left-right direction (to the right in a forward-facing configuration) and extends to the side surface of the adapter 31c. An upper channel inlet 31Pi, which opens downward, is provided at the lower end of the first upper channel 31P1 (i.e., the lower surface of the adapter 31c). In other words, the upper channel 31P includes the upper channel inlet 31Pi.

[0042] The second upper flow channel 31P2 extends upward from the lower surface of the adapter 31c. An upper flow channel outlet 31Po, which opens downward, is provided at the lower end of the second upper flow channel 31P2 (i.e., the lower surface of the adapter 31c). In other words, the upper flow channel 31P includes the upper flow channel outlet 31Po. More specifically, the upper flow channel outlet 31Po includes a first upper flow channel outlet 31Po1 and a second upper flow channel outlet 31Po2. The first upper flow channel outlet 31Po1 is positioned on the opposite side of the projection 31c1 from the second upper flow channel outlet 31Po2. A drive shaft 32a is inserted through the second upper flow channel outlet 31Po2.

[0043] The first upper flow path 31P1 and the second upper flow path 31P2 are connected via connecting piping (not shown) of the upper unit 31, which is provided separately from the adapter 31c. Specifically, the connecting piping connects the first upper flow path 31P1 to the pump 31b (see Figure 2). The connecting piping also connects the pump 31b to a motor flow path (not shown) provided inside or outside the electric motor 31a (see Figure 2). Furthermore, the connecting piping connects the motor flow path to the second upper flow path 31P2. Note that the conduit of the connecting piping and the motor flow path are included in the upper flow path 31P. In other words, the upper flow path 31P is provided in the upper unit 31.

[0044] In this embodiment, the upper flow path 31P provided in the upper unit 31 and the lower flow path 32P provided in the lower unit 32 are collectively referred to as the flow path CLP (for the refrigerant CL). That is, the flow path CLP has an upper flow path 31P and a lower flow path 32P.

[0045] The intermediate unit 33 has a plurality of switching members SP. The plurality of switching members SP include an upper member SP1, a lower member SP2, and a middle member SP3. The upper member SP1, the middle member SP3, and the lower member SP2 are arranged in this order from top to bottom. That is, the middle member SP3 is positioned between the upper member SP1 and the lower member SP2. Also, the upper member SP1, the middle member SP3, and the lower member SP2 are arranged side by side in the vertical direction.

[0046] Furthermore, the intermediate member SP3 is rotatable around an axis along the vertical direction relative to the upper member SP1 and the lower member SP2. Specifically, comparing the case where the sail drive 3 is positioned facing forward and the case where it is positioned facing backward, the intermediate member SP3 is positioned rotated 90 degrees around an axis along the vertical direction relative to the upper member SP1 and the lower member SP2. Then, whether the sail drive 3 is positioned facing forward or backward, the upper flow outlet 31Po of the upper flow path 31P and the lower flow inlet 32P of the lower flow path 32P are connected. Also, the lower flow outlet 32Po of the lower flow path 32P and the upper flow inlet 31P of the upper flow path 31P are connected. Therefore, when the pump 31b is driven, the refrigerant CL circulates between the upper flow path 31P and the lower flow path 32P via the intermediate unit 33. That is, the refrigerant CL flows between the upper unit 31 and the lower unit 32 via the intermediate unit 33.

[0047] In particular, in the upper flow path 31P, the refrigerant CL flows, for example, through the motor flow path of the electric motor 31a. When the refrigerant CL flows through the motor flow path, heat exchange occurs between the refrigerant CL and the electric motor 31a. That is, the electric motor 31a is cooled by the refrigerant CL. The following describes in detail how the rotation of the middle member SP3 maintains the connection between the upper flow path 31P and the lower flow path 32P, that is, how the flow path CLP of the refrigerant CL switches.

[0048] [3. Switching the flow path] [3-1. Configuration of the intermediate unit] First, the configurations of each part of the intermediate unit 33, namely the upper member SP1, the lower member SP2, and the middle member SP3, will be explained based on Figures 6 and 7. Figures 6 and 7 are perspective views from above and below, respectively, showing the configuration of the intermediate unit 33 disassembled in the vertical direction.

[0049] The upper member SP1 is composed of a cylindrical metal member extending in the vertical direction. However, the composition of the upper member SP1 is not limited to the above, and it may be made of a resin member, for example. The upper member SP1 has a pair of first grooves SP1a and second grooves SP1b (see Figure 7 in particular). The first groove SP1a is formed on the left front side of the upper member SP1, and the second groove SP1b is formed on the right rear side of the upper member SP1. However, the arrangement of the first groove SP1a and the second groove SP1b is not limited to the above. For example, the first groove SP1a may be located on the right rear side of the upper member SP1, and the second groove SP1b may be located on the left front side of the upper member SP1.

[0050] The first groove SP1a has a shape that is recessed upward and extends along the circumferential direction of the upper member SP1. That is, the lower side of the first groove SP1a is open (see Figure 7 in particular). Similar to the first groove SP1a, the second groove SP1b also has a shape that is recessed upward and extends along the circumferential direction of the upper member SP1. That is, the lower side of the second groove SP1b is also open. As described above, the middle member SP3 is located below the upper member SP1. Therefore, the upper member SP1 is positioned so that the openings of the first groove SP1a and the second groove SP1b face the middle member SP3 (see Figure 7 in particular).

[0051] The upper member SP1 further includes a first opening OP1, a first upper port PU1, and a second upper port PU2. More details are as follows: Figure 8 is a plan view of the upper member SP1. The first opening OP1 is located in the horizontal center of the upper member SP1 and penetrates through it in the vertical direction. Therefore, the central axis SP1AX of the upper member SP1 extends through the horizontal center of the first opening OP1.

[0052] The first opening OP1 is provided with a plurality of first recesses OP1a. In this embodiment, there are four first recesses OP1a. Specifically, there is a first recess OP1a that recesses forward on the front side of the first opening OP1, and a first recess OP1a that recesses backward on the rear side of the first opening OP1. In addition, there is a first recess OP1a that recesses to the left on the left side of the first opening OP1, and a first recess OP1a that recesses to the right on the right side of the first opening OP1. Note that the number of first recesses OP1a is not limited to four. For example, there may be one first recess OP1a, or there may be more than four. A first upper port PU1 and a second upper port PU2 are arranged radially outward of the first opening OP1.

[0053] The first upper port PU1 is located in front of the first opening OP1, and the second upper port PU2 is located behind the first opening OP1. More specifically, the second upper port PU2 is located on the opposite side of the central axis SP1AX of the upper member SP1 from the first upper port PU1. Furthermore, the first upper port PU1, the central axis SP1AX of the upper member SP1, and the second upper port PU2 are aligned on a straight line (a straight line parallel to the front-rear direction in this embodiment). In other words, the first upper port PU1 and the second upper port PU2 are arranged symmetrically with respect to the central axis SP1AX of the upper member SP1 in a plan view (viewing the upper member SP1 from above).

[0054] The first upper port PU1 and the second upper port PU2 are provided, respectively, penetrating vertically through the upper surface SP1U of the upper member SP1 (see also Figure 6). That is, the first upper port PU1 and the second upper port PU2 are formed downward from the upper surface SP1U of the upper member SP1.

[0055] The first upper port PU1 and the second upper port PU2 are formed in a substantially elliptical shape extending along the circumferential direction of the upper member SP1 in a plan view. However, the shapes of the first upper port PU1 and the second upper port PU2 are not limited to the above, and may be, for example, circular, square, rectangular, or polygonal shapes other than square and rectangular.

[0056] The first upper port PU1 is connected to one end of the first groove SP1a (the right front side in this embodiment). The second upper port PU2 is connected to one end of the second groove SP1b (the left rear side in this embodiment). In other words, the first groove SP1a is connected to the first upper port PU1, and the second groove SP1b is connected to the second upper port PU2.

[0057] Furthermore, when the sail drive 3 is positioned facing forward, the first upper port PU1 is connected to the upper channel inlet 31Pi of the upper channel 31P of the upper unit 31, and the second upper port PU2 is connected to the first upper channel outlet 31Po1 of the upper channel 31P. On the other hand, when the sail drive 3 is positioned facing backward, the first upper port PU1 is connected to the first upper channel outlet 31Po1 of the upper channel 31P, and the second upper port PU2 is connected to the upper channel inlet 31Pi of the upper channel 31P. In both the forward and backward orientations of the sail drive 3, the second upper channel outlet 31Po2 of the upper channel 31P is connected to the second lower channel inlet 32Pi2 of the lower channel 32P.

[0058] The upper member SP1 is also provided with an insertion portion SP1c into which a pin (not shown) is inserted to prevent a flat plate-shaped sealing member (not shown) located between the adapter 31c and the upper member SP1 from unintentionally rotating around an axis along the vertical direction (shifting of its position).

[0059] As shown in Figures 6 and 7 (returning to Figures 7), the lower member SP2 is composed of a cylindrical metal member extending in the vertical direction. However, the composition of the lower member SP2 is not limited to the above, and it may be made of, for example, a resin member. The outer diameter of the lower member SP2 is larger than the outer diameter of the upper member SP1.

[0060] The lower member SP2 has a pair of third grooves SP2a and fourth grooves SP2b (see Figure 6 in particular). The third groove SP2a is formed on the right front side of the lower member SP2, and the fourth groove SP2b is formed on the left rear side of the lower member SP2. However, the arrangement of the third groove SP2a and the fourth groove SP2b is not limited to the above. For example, the third groove SP2a may be located on the left rear side of the lower member SP2, and the fourth groove SP2b may be located on the right front side of the lower member SP2.

[0061] The third groove SP2a has a shape that is recessed downwards and extends along the circumferential direction of the lower member SP2. That is, the upper side of the third groove SP2a is open (see Figure 6 in particular). Similar to the third groove SP2a, the fourth groove SP2b also has a shape that is recessed downwards and extends along the circumferential direction of the lower member SP2. That is, the upper side of the fourth groove SP2b is also open. As described above, the middle member SP3 is located above the lower member SP2. Therefore, the lower member SP2 is positioned so that the openings of the third groove SP2a and the fourth groove SP2b face the middle member SP3 (see Figure 6 in particular).

[0062] In particular, as shown in Figure 7, the lower member SP2 further includes a second opening OP2, a first lower port PD1, and a second lower port PD2. More details are as follows. Figure 9 is a plan view of the lower member SP2. The second opening OP2 is located in the horizontal center of the lower member SP2 and penetrates it vertically. Therefore, the central axis SP2AX of the lower member SP2 extends through the horizontal center of the second opening OP2.

[0063] Multiple second recesses OP2a are provided in the second opening OP2. In this embodiment, there are four second recesses OP2a. Specifically, there is a second recess OP2a that recesses forward on the front side of the second opening OP2, and a second recess OP2a that recesses backward on the rear side of the second opening OP2. In addition, there is a second recess OP2a that recesses to the left on the left side of the second opening OP2, and a second recess OP2a that recesses to the right on the right side of the second opening OP2. Note that the number of second recesses OP2a is not limited to four. For example, there may be one second recess OP2a, or there may be more than four. The first lower port PD1 and the second lower port PD2 are arranged radially outward of the second opening OP2.

[0064] The first lower port PD1 is located on the front side of the lower member SP2, and the second lower port PD2 is located on the rear side of the lower member SP2. More specifically, the second lower port PD2 is located on the opposite side of the central axis SP2AX of the lower member SP2 from the first lower port PD1. Furthermore, the first lower port PD1, the central axis SP2AX of the lower member SP2, and the second lower port PD2 are aligned on a straight line (a straight line parallel to the front-to-back direction in this embodiment). In other words, the first lower port PD1 and the second lower port PD2 are arranged symmetrically with respect to the central axis SP2AX of the lower member SP2 in a plan view (viewing the lower member SP2 from above).

[0065] The first lower port PD1 and the second lower port PD2 are provided, respectively, penetrating vertically through the lower surface SP2D (see Figure 7) of the lower member SP2. That is, the first lower port PD1 and the second lower port PD2 are formed upward from the lower surface SP2D of the lower member SP2.

[0066] The first lower port PD1 and the second lower port PD2 are formed in a substantially elliptical shape extending along the circumferential direction of the lower member SP2 in a plan view. However, the shapes of the first lower port PD1 and the second lower port PD2 are not limited to the above, and may be, for example, circular, square, rectangular, or polygonal shapes other than squares and rectangles.

[0067] The first lower port PD1 is connected to one end of the third groove SP2a (the left front side in this embodiment). The second lower port PD2 is connected to one end of the fourth groove SP2b (the right rear side in this embodiment). In other words, the third groove SP2a is connected to the first lower port PD1, and the fourth groove SP2b is connected to the second lower port PD2.

[0068] Furthermore, the first lower port PD1 is connected to the lower channel outlet 32Po in the lower channel 32P of the lower unit 32, and the second lower port PD2 is connected to the first lower channel inlet 32Pi1 of the lower channel 32P (see Figures 4 and 5).

[0069] The lower member SP2 is also provided with a through-hole SP2c that connects to the water channel 32W (see Figure 4, etc.) of the lower unit 32, and multiple through-holes SP2e through which bolts B1 (see Figure 2) that fasten the lower unit 32 and the upper unit 31 are inserted.

[0070] As shown in Figures 6 and 7 (returning to them), the intermediate member SP3 is composed of an annular metal member. However, the composition of the intermediate member SP3 is not limited to the above, and may be, for example, a resin member.

[0071] The central member SP3 has a pair of through holes SP3a (first through hole SP3a1, second through hole SP3a2) and a positioning portion SP3b. The first through hole SP3a1 and the second through hole SP3a2 are provided in the central member SP3, penetrating in the vertical direction. The second through hole SP3a2 is positioned opposite the first through hole SP3a1 with respect to the central axis SP3AX of the central member SP3. Furthermore, the first through hole SP3a1, the central axis SP3AX of the central member SP3, and the second through hole SP3a2 are aligned on a straight line (a straight line parallel to the front-to-back direction in Figure 6). In other words, the first through hole SP3a1 and the second through hole SP3a2 are positioned symmetrically with respect to the central axis SP3AX of the central member SP3 in a plan view (viewing the central member SP3 from above).

[0072] In this embodiment, as shown in Figures 6 and 7, the arrangement (arrangement direction) of the intermediate member SP3 in which the line connecting the first through hole SP3a1 and the second through hole SP3a2 is parallel to the front-to-back direction is called the "front-to-back arrangement." In contrast, as shown in Figure 10, which will be described later, the arrangement of the intermediate member SP3 in which the line connecting the first through hole SP3a1 and the second through hole SP3a2 is parallel to the left-to-right direction is called the "left-to-right arrangement."

[0073] The positioning section SP3b is composed of a first positioning section SP3b1 that protrudes upward from the inner peripheral edge SP3E of the middle member SP3, and a second positioning section SP3b2 that protrudes downward from the inner peripheral edge SP3E of the middle member SP3. As described above, the upper member SP1 is located above the middle member SP3, and the lower member SP2 is located below the middle member SP3. Therefore, the first positioning section SP3b1 protrudes toward the upper member SP1, and the second positioning section SP3b2 protrudes toward the lower member SP2. Note that the configuration of the positioning section SP3b is not limited to the above, and for example, a configuration in which either the first positioning section SP3b1 or the second positioning section SP3b2 is omitted may be possible. In other words, the positioning section SP3b protrudes toward at least one of the upper member SP1 and the lower member SP2.

[0074] In this embodiment, two first positioning parts SP3b1 and two second positioning parts SP3b2 are provided. The two first positioning parts SP3b1 are arranged symmetrically with respect to the central axis SP3AX of the central member SP3 in a plan view. Similarly, the two second positioning parts SP3b2 are arranged symmetrically with respect to the central axis SP3AX of the central member SP3 in a plan view. The straight line connecting each of the first positioning parts SP3b1 and the straight line connecting each of the second positioning parts SP3b2 are perpendicular to each other.

[0075] When assembling the intermediate unit 33, for example, first, the middle member SP3 is placed relative to the lower member SP2. Specifically, the middle member SP3 is moved from above to below the lower member SP2. At this time, the second positioning part SP3b2 of the middle member SP3 is moved while corresponding to (aligning with) the second recess OP2a of the lower member SP2. As a result, the second positioning part SP3b2 is inserted into the second recess OP2a, and the middle member SP3 can be placed on the upper surface of the lower member SP2. That is, the second positioning part SP3b2 corresponds to the lower member SP2. The second positioning part SP3b2 (and the second recess OP2a) reduces the misalignment of the position and direction of the middle member SP3 relative to the lower member SP2.

[0076] Next, the upper member SP1 is positioned relative to the middle member SP3. Specifically, the upper member SP1 is moved from above to below the middle member SP3 (which is positioned on the upper surface of the lower member SP2). At this time, the first recess OP1a of the upper member SP1 is moved while corresponding to (aligning with) the first positioning part SP3b1 of the middle member SP3. As a result, the first positioning part SP3b1 is inserted into the first recess OP1a, and the upper member SP1 can be positioned on the upper surface of the middle member SP3. In other words, the first positioning part SP3b1 corresponds to the upper member SP1. The first positioning part SP3b1 (and the first recess OP1a) reduces the misalignment of the position and direction of the middle member SP3 relative to the upper member SP1.

[0077] Therefore, the positioning section SP3b in this embodiment corresponds to the upper member SP1 and the lower member SP2. However, as described above, the positioning section SP3b may be limited to either the first positioning section SP3b1 or the second positioning section SP3b2. In this case, the positioning section SP3b corresponds to either the upper member SP1 or the lower member SP2. In other words, the positioning section SP3b corresponds to at least one of the upper member SP1 or the lower member SP2.

[0078] From the viewpoint of reducing misalignment of the position and direction of the intermediate member SP3 with respect to at least one of the upper member SP1 and the lower member SP2, the following configuration is desirable. That is, as in this embodiment, it is desirable that the intermediate member SP3 has a positioning portion SP3b that corresponds to at least one of the upper member SP1 and the lower member SP2.

[0079] From the viewpoint of achieving a simple and reliable configuration that reduces misalignment of the position and direction of the intermediate member SP3, the following configuration is desirable. That is, as in this embodiment, it is desirable that the positioning part SP3b protrudes toward at least one of the upper member SP1 and the lower member SP2. The flow of refrigerant CL in the intermediate unit 33 will be described below.

[0080] [3-2. Refrigerant flow in the intermediate unit] First, as shown in Figures 6 and 7, the flow of refrigerant CL when the middle member SP3 is arranged front to back will be explained. When the middle member SP3 is arranged front to back, as described above, the straight line connecting the first through hole SP3a1 and the second through hole SP3a2 is parallel to the front to back direction. That is, for example, the first through hole SP3a1 is located in front of the central axis SP3AX of the middle member SP3, and the second through hole SP3a2 is located behind the central axis SP3AX of the middle member SP3. Then, in a plan view, the first through hole SP3a1 coincides with one end of the first groove SP1a of the upper member SP1 (the right front side in this embodiment) and one end of the third groove SP2a of the lower member SP2 (the left front side in this embodiment). For this reason, the first groove SP1a and the third groove SP2a are in communication through the first through hole SP3a1.

[0081] As described above, the first upper port PU1, which is connected to the first groove SP1a, is connected to the upper channel inlet 31Pi of the upper channel 31P when the sail drive 3 is facing forward. Also, the first lower port PD1, which is connected to the third groove SP2a, is connected to the lower channel outlet 32Po of the lower channel 32P. Therefore, when the sail drive 3 is facing forward and the middle member SP3 is arranged front to back, the upper channel inlet 31Pi and the lower channel outlet 32Po are in communication via the first upper port PU1, the first groove SP1a, the first through hole SP3a1, the third groove SP2a, and the first lower port PD1. Note that the other end of the first groove SP1a (the left rear side in this embodiment) and the other end of the third groove SP2a (the right rear side in this embodiment) are closed by the middle member SP3. As a result, the refrigerant CL flowing out from the lower flow outlet 32Po flows into the upper flow inlet 31Pi through the first lower port PD1, the third groove SP2a, the first through hole SP3a1, the first groove SP1a, and the first upper port PU1.

[0082] On the other hand, the second through-hole SP3a2, in a plan view, overlaps with one end of the second groove SP1b of the upper member SP1 (the left rear side in this embodiment) and one end of the fourth groove SP2b of the lower member SP2 (the right rear side in this embodiment). Therefore, the second groove SP1b and the fourth groove SP2b are in communication through the second through-hole SP3a2.

[0083] As described above, the second upper port PU2, which is connected to the second groove SP1b, is connected to the first upper channel outlet 31Po1 of the upper channel 31P when the sail drive 3 is facing forward. Also, the second lower port PD2, which is connected to the fourth groove SP2b, is connected to the first lower channel inlet 32Pi1 of the lower channel 32P. Therefore, when the sail drive 3 is facing forward and the middle member SP3 is facing forward, the first upper channel outlet 31Po1 and the first lower channel inlet 32Pi1 are in communication. More specifically, the first upper channel outlet 31Po1 and the first lower channel inlet 32Pi1 are in communication via the second upper port PU2, the second groove SP1b, the second through hole SP3a2, the fourth groove SP2b, and the second lower port PD2. Furthermore, the other end of the second groove SP1b (the right front side in this embodiment) and the other end of the fourth groove SP2b (the left front side in this embodiment) are closed by the intermediate member SP3. As a result, the refrigerant CL flowing out from the first upper flow channel outlet 31Po1 flows through the second upper port PU2, the second groove SP1b, the second through hole SP3a2, the fourth groove SP2b, and the second lower port PD2 to enter the first lower flow channel inlet 32Pi1.

[0084] Furthermore, the positions of the first through-hole SP3a1 and the second through-hole SP3a2 may be reversed. That is, the first through-hole SP3a1 may be located behind the central axis SP3AX of the middle member SP3, and the second through-hole SP3a2 may be located in front of the central axis SP3AX of the middle member SP3.

[0085] In this embodiment, the case in the intermediate unit 33 where the first groove SP1a and the third groove SP2a are in communication, and the second groove SP1b and the fourth groove SP2b are in communication, is referred to as the first communication mode 33M1. That is, the intermediate unit 33 has the first communication mode 33M1, in which the first groove SP1a and the third groove SP2a are in communication, and the second groove SP1b and the fourth groove SP2b are in communication.

[0086] Next, the flow of refrigerant CL when the intermediate member SP3 is arranged on the left and right sides will be explained based on Figure 10. Figure 10 is an explanatory diagram illustrating the flow of refrigerant CL when the intermediate member SP3 is arranged on the left and right sides. The left side of Figure 10 illustrates the flow of refrigerant CL flowing out from the first upper flow channel outlet 31Po1. The right side of Figure 10 illustrates the flow of refrigerant CL flowing out from the lower flow channel outlet 32Po. Note that the intermediate unit 33 in the left side of Figure 10 and the intermediate unit 33 in the right side of Figure 10 have the same configuration. Also, in Figure 10, for convenience, the flow of refrigerant CL flowing out from the lower flow channel outlet 32Po and the flow of refrigerant CL flowing out from the first upper flow channel outlet 31Po1 are shown separately, but this is merely for explanatory purposes and does not mean that each refrigerant CL flow occurs separately.

[0087] As shown in the left-hand diagram in Figure 10, when the central member SP3 is arranged left and right, the straight line connecting the first through-hole SP3a1 and the second through-hole SP3a2 is parallel to the left-right direction, as described above. That is, for example, the first through-hole SP3a1 is located to the left of the central axis SP3AX of the central member SP3, and the second through-hole SP3a2 is located to the right of the central axis SP3AX of the central member SP3. In this case, the first through-hole SP3a1 coincides with the other end of the first groove SP1a of the upper member SP1 (the left rear side in this embodiment) and the other end of the fourth groove SP2b of the lower member SP2 (the left front side in this embodiment) in a plan view. Therefore, the first groove SP1a and the fourth groove SP2b are in communication through the first through-hole SP3a1.

[0088] As described above, the first upper port PU1 connected to the first groove SP1a is connected to the first upper channel outlet 31Po1 of the upper channel 31P when the sail drive 3 is facing backward. Therefore, when the sail drive 3 is facing backward and the middle member SP3 is arranged left and right, the first upper channel outlet 31Po1 and the first lower channel inlet 32Pi1 are in communication via the first upper port PU1, the first groove SP1a, the first through hole SP3a1, the fourth groove SP2b, and the second lower port PD2. In other words, even when the orientation of the upper unit 31 relative to the lower unit 32 is changed, the intermediate unit 33 provides the following communication. That is, the intermediate unit 33 connects the lower channel inlet 32Pi (first lower channel inlet 32Pi1 in this embodiment) and the upper channel outlet 31Po (first upper channel outlet 31Po1 in this embodiment).

[0089] As a result, the refrigerant CL flowing out from the first upper flow channel outlet 31Po1 flows into the first groove SP1a via the first upper port PU1. The refrigerant CL that has flowed into the first groove SP1a flows along the first groove SP1a, that is, along the circumferential direction of the upper member SP1 (counterclockwise in a plan view in this embodiment), and flows into the fourth groove SP2b via the first through hole SP3a1. The refrigerant CL that has flowed into the fourth groove SP2b flows along the fourth groove SP2b, that is, along the circumferential direction of the lower member SP2 (counterclockwise in a plan view in this embodiment), and flows into the first lower flow channel inlet 32Pi1 via the second lower port PD2.

[0090] As shown in the right-hand diagram of Figure 10, the second through-hole SP3a2, in a plan view, overlaps with the other end of the second groove SP1b of the upper member SP1 (the right front side in this embodiment) and the other end of the third groove SP2a of the lower member SP2 (the right rear side in this embodiment). Therefore, the second groove SP1b and the third groove SP2a are in communication through the second through-hole SP3a2.

[0091] As described above, the second upper port PU2, which is connected to the second groove SP1b, is connected to the upper channel inlet 31Pi of the upper channel 31P when the sail drive 3 is facing backward. Therefore, when the sail drive 3 is facing backward and the intermediate member SP3 is arranged left and right, the upper channel inlet 31Pi and the lower channel outlet 32Po are in communication via the second upper port PU2, the second groove SP1b, the second through hole SP3a2, the third groove SP2a, and the first lower port PD1. In other words, the intermediate unit 33 maintains communication between the lower channel outlet 32Po and the upper channel inlet 31Pi even when the orientation of the upper unit 31 relative to the lower unit 32 is changed.

[0092] As a result, the refrigerant CL flowing out from the lower flow channel outlet 32Po flows into the third groove SP2a via the first lower port PD1. The refrigerant CL that has flowed into the third groove SP2a flows along the third groove SP2a, that is, along the circumferential direction of the lower member SP2 (clockwise in a plan view in this embodiment), and flows into the second groove SP1b via the second through hole SP3a2. The refrigerant CL that has flowed into the second groove SP1b flows along the second groove SP1b, that is, along the circumferential direction of the upper member SP1 (clockwise in a plan view in this embodiment), and flows into the upper flow channel inlet 31Pi via the second upper port PU2.

[0093] Thus, when the positions of the first through-hole SP3a1 and the second through-hole SP3a2 of the central member SP3 are changed, the flow path CLP of the refrigerant CL in the intermediate unit 33 is switched. In this embodiment, the position changes of the first through-hole SP3a1 and the second through-hole SP3a2 are achieved by rotating the central member SP3 around an axis along the vertical direction. Therefore, when the central member SP3 rotates around an axis along the vertical direction (even if it has already rotated), the flow path CLP of the refrigerant CL in the intermediate unit 33 is switched. In other words, the intermediate unit 33 switches the flow path CLP of the refrigerant CL.

[0094] Here, we will explain the flow of refrigerant CL when the sail drive 3 is positioned rearward and the intermediate member SP3 is positioned front-to-back, based on Figure 11. Figure 11 is an explanatory diagram illustrating the flow of refrigerant CL when the sail drive 3 is positioned rearward and the intermediate member SP3 is positioned front-to-back. Note that this flow of refrigerant CL can also occur when, for example, the flow path switching function of the intermediate unit 33 is disabled, or when the intermediate unit 33 is removed from the sail drive 3.

[0095] As the central component SP3 is positioned front to back, the first upper port PU1 and the first lower port PD1 are in communication, as shown in Figure 6, and the second upper port PU2 and the second lower port PD2 are in communication. Furthermore, as the sail drive 3 is positioned rearward, the first upper port PU1 is connected to the first upper channel outlet 31Po1 of the upper channel 31P, and the second upper port PU2 is connected to the upper channel inlet 31Pi of the upper channel 31P. In addition, (regardless of whether the sail drive 3 is positioned forward or rearward) the first lower port PD1 is connected to the lower channel outlet 32Po of the lower channel 32P, and the second lower port PD2 is connected to the first lower channel inlet 32Pi1 of the lower channel 32P. Therefore, in this case, the first upper channel outlet 31Po1 and the lower channel outlet 32Po are in communication, and the upper channel inlet 31Pi and the first lower channel inlet 32Pi1 are in communication.

[0096] In this case, when the pump 31b (see Figure 2) provided in the upper unit 31 is driven, the refrigerant CL flows toward the upper flow outlet 31Po (first upper flow outlet 31Po1 and second upper flow outlet 31Po2). Since the first upper flow outlet 31Po1 is in communication with the lower flow outlet 32Po, the refrigerant CL that flows toward the first upper flow outlet 31Po1 flows into the lower flow outlet 32Po. On the other hand, as described above, (regardless of whether the sail drive 3 is in a forward or backward configuration) the second upper flow outlet 31Po2 is in communication with the second lower flow inlet 32Pi2. Therefore, the refrigerant CL that flows toward the second upper flow outlet 31Po2 flows into the second lower flow inlet 32Pi2.

[0097] The refrigerant CL flows more easily when flowing from the second lower flow inlet 32Pi2 towards the first lower flow inlet 32Pi1 than when flowing from the lower flow outlet 32Po towards the first lower flow inlet 32Pi1 (via the connection part 32P3). More specifically, the refrigerant CL flows more easily when flowing from the second lower flow inlet 32Pi2 towards the first lower flow inlet 32Pi1 than when flowing from the lower flow outlet 32Po towards the first lower flow inlet 32Pi1 because the distance it travels is shorter. In addition, the refrigerant CL flowing from the lower flow outlet 32Po towards the first lower flow inlet 32Pi1 passes through a component provided in the lower flow channel 32P (for example, the first gear 32a1), and this component acts as resistance, making it difficult for the refrigerant CL to flow.

[0098] Therefore, much of the refrigerant CL that flows toward the upper flow outlet 31Po flows toward the first lower flow inlet 32Pi1 via the second upper flow outlet 31Po2 and the second lower flow inlet 32Pi2. This reduces the circulation efficiency of the refrigerant CL in the lower unit 32. When the circulation efficiency of the refrigerant CL decreases in the lower unit 32 (lower flow channel 32P), it becomes more difficult for the refrigerant CL to be cooled by heat exchange between the refrigerant CL and the seawater flowing through the water channel 32W. As a result, the temperature of the refrigerant CL gradually rises, and the sail drive 3 overheats.

[0099] With the above configuration (i.e., the configuration in which the intermediate unit 33 switches the flow path CLP of the refrigerant CL), the following becomes possible. That is, even if the orientation of the upper unit 31 relative to the lower unit 32 is changed, the flow path CLP of the refrigerant CL can be switched accordingly in a manner that avoids a decrease in the circulation efficiency of the refrigerant CL. This prevents a decrease in the circulation efficiency of the refrigerant CL and ensures that the refrigerant CL is cooled reliably. Therefore, overheating of the sail drive 3 can be avoided. As a result, even if the orientation of the upper unit 31 relative to the lower unit 32 is changed, overheating of the sail drive 3 can be avoided.

[0100] In a configuration where the flow path CLP has a lower flow path 32P of the lower unit 32 and an upper flow path 31P of the upper unit 31, the following configuration is desirable in order to reliably realize a configuration in which the flow path CLP switches even when the orientation of the upper unit 31 relative to the lower unit 32 is changed. That is, as in this embodiment, it is desirable that the intermediate unit 33 maintains the connection relationship between the lower flow path 32P and the upper flow path 31P.

[0101] In a configuration where the lower channel 32P includes a lower channel inlet 32Pi and a lower channel outlet 32Po, and the upper channel 31P includes an upper channel inlet 31Pi and an upper channel outlet 31Po, the following configuration is desirable in order to reliably realize a configuration that maintains the above connection relationship. That is, as in this embodiment, when the orientation of the upper unit 31 is changed relative to the lower unit 32, it is desirable that the intermediate unit 33 connects the lower channel inlet 32Pi (first lower channel inlet 32Pi1 in this embodiment) and the upper channel outlet 31Po (first upper channel outlet 31Po1 in this embodiment). In addition, it is desirable that the intermediate unit 33 connects the lower channel outlet 32Po and the upper channel inlet 31Pi.

[0102] For example, if the intermediate unit 33 is composed of multiple members, it becomes easier to provide a flow path switching function compared to when it is composed of a single member. Therefore, from the viewpoint of easily providing a flow path switching function to the intermediate unit 33, it is desirable that the intermediate unit 33 has multiple switching members 33a, as in this embodiment.

[0103] From the viewpoint of simplifying the configuration of each switching member 33a that constitutes the flow path switching function, the following configuration is desirable. That is, as in this embodiment, it is desirable that the multiple switching members 33a include an upper member SP1 having a first groove SP1a and a second groove SP1b, a lower member SP2 having a third groove SP2a and a fourth groove SP2b, and an intermediate member SP3 having a pair of through holes SP3a. Furthermore, from the viewpoint of providing a flow path switching function in the intermediate unit 33 by a combination of the first groove SP1a and the second groove SP1b, the third groove SP2a and the fourth groove SP2b, and the pair of through holes SP3a, the following configuration is desirable. That is, as in this embodiment, in a configuration where the intermediate member SP3 is arranged between the upper member SP1 and the lower member SP2, it is desirable that the upper member SP1 is arranged so that the openings of the first groove SP1a and the second groove SP1b face the intermediate member SP3. Furthermore, it is desirable that the lower member SP2 is arranged so that the openings of the third groove SP2a and the fourth groove SP2b face the intermediate member SP3.

[0104] In a configuration in which the upper member SP1 has a first upper port PU1 and a second upper port PU2 formed downward from the upper surface SP1U of the upper member SP1, the following configuration is desirable from the viewpoint of having the first groove SP1a and the second groove SP1b function as flow paths CLP for the refrigerant CL. That is, as in this embodiment, it is desirable that the first groove SP1a is connected to the first upper port PU1 and recessed upward. Also, it is desirable that the second groove SP1b is connected to the second upper port PU2 and recessed upward.

[0105] In a configuration where the lower member SP2 has a first lower port PD1 and a second lower port PD2 formed upward from the lower surface SP2D of the lower member SP2, the following configuration is desirable from the viewpoint of having the third groove SP2a and the fourth groove SP2b function as flow paths CLP for the refrigerant CL. That is, as in this embodiment, it is desirable that the third groove SP2a is connected to the first lower port PD1 and recessed downward. Also, it is desirable that the fourth groove SP2b is connected to the second lower port PD2 and recessed downward.

[0106] From the perspective of simplifying the configuration of the upper member SP1 and reducing its manufacturing cost, it is desirable that the first upper port PU1 and the second upper port PU2 be arranged symmetrically with respect to the central axis SP1AX of the upper member SP1 in a plan view, as shown in Figure 8.

[0107] From the perspective of simplifying the configuration of the lower member SP2 and reducing its manufacturing cost, it is desirable that the first lower port PD1 and the second lower port PD2 be arranged symmetrically with respect to the central axis SP2AX of the lower member SP2 in a plan view, as shown in Figure 9.

[0108] In a configuration where the upper member SP1, middle member SP3, and lower member SP2 are arranged side by side in the vertical direction, the following configuration is desirable from the viewpoint of simplifying the switching of the flow path CLP. That is, as in this embodiment, it is desirable that the flow path CLP switches when the middle member SP3 rotates around an axis along the vertical direction.

[0109] From the perspective of effectively utilizing the pair of through-holes SP3a to achieve switching of the flow path CLP, it is desirable that the flow path CLP switches when the position of the pair of through-holes SP3a is changed, as in this embodiment.

[0110] In this embodiment, the case in the intermediate unit 33 where the first groove SP1a and the fourth groove SP2b are in communication, and the second groove SP1b and the third groove SP2a are in communication, is called the second communication mode 33M2 (see Figure 10). That is, the intermediate unit 33 has the second communication mode 33M2, in which the first groove SP1a and the fourth groove SP2b are in communication, and the second groove SP1b and the third groove SP2a are in communication. In other words, when the middle member SP3 is arranged on the left and right, the intermediate unit 33 is in the second communication mode 33M2.

[0111] On the other hand, as described above, in the first communication mode 33M1, the first groove SP1a and the third groove SP2a are in communication, and the second groove SP1b and the fourth groove SP2b are in communication (see Figures 6 and 7). That is, when the intermediate member SP3 is arranged front to back, the intermediate unit 33 is in the first communication mode 33M1. Therefore, when the intermediate member SP3 rotates around an axis along the vertical direction, that is, when the position of the pair of through holes SP3a in the intermediate member SP3 is changed, the first communication mode 33M1 and the second communication mode 33M2 are switched.

[0112] In a configuration in which the intermediate unit 33 has a first communication mode 33M1 and a second communication mode 33M2, the following configuration is desirable in order to reliably realize a configuration that simplifies the switching of the flow path CLP. That is, as in this embodiment, it is desirable that the first communication mode 33M1 and the second communication mode 33M2 are switched when the middle member SP3 rotates around an axis along the vertical direction.

[0113] Furthermore, in a configuration in which the intermediate unit 33 has a first communication mode 33M1 and a second communication mode 33M2, and in order to reliably realize a configuration that effectively utilizes the pair of through holes SP3a to achieve switching of the flow path CLP, the following configuration is desirable. That is, as in this embodiment, it is desirable that when the position of the pair of through holes SP3a is changed, the first communication mode 33M1 and the second communication mode 33M2 are switched.

[0114] [3-3. Modified Intermediate Units] Modified versions of the intermediate unit 33 will be described based on Figures 12, 13, and 14. Figure 12 is an overhead perspective view showing the configuration of a modified version of the intermediate unit 33 exploded vertically. Figure 13 is a plan view showing the configuration of the internal member SP5, which will be described later, included in the modified intermediate unit 33. Figure 14 is an explanatory diagram illustrating the flow of refrigerant CL when the sail drive 3 is arranged facing backward. Note that in Figure 14, for convenience, the flow of refrigerant CL flowing out from the lower flow channel outlet 32Po and the flow of refrigerant CL flowing out from the first upper flow channel outlet 31Po1 are shown separately, but this is merely for illustrative purposes and does not mean that the flows of each refrigerant CL occur separately.

[0115] In particular, as shown in Figure 12, the modified intermediate unit 33 has a plurality of switching members 33a, namely an outer member SP4 and an inner member SP5. The outer member SP4 is composed of an annular flat plate member (e.g., a thick plate member) extending in the horizontal direction. The outer member SP4 is composed of, for example, a metal member. However, the composition of the outer member SP4 is not limited to the above, and may be, for example, a resin member.

[0116] The outer member SP4 is provided with a channel hole SP4a that connects to the channel 32W (see Figure 4, etc.) of the lower unit 32, and multiple insertion holes SP4b through which bolts B1 (see Figure 2) that fasten the lower unit 32 and the upper unit 31 are inserted. The inner member SP5 is rotatably positioned in the horizontal center of the outer member SP4.

[0117] The internal member SP5 is composed of a cylindrical metal member extending in the vertical direction. However, the composition of the internal member SP5 is not limited to the above, and may be made of a resin member, for example. The internal member SP5 has a third opening OP3 and a pair of grooves SP5a.

[0118] The third opening OP3 is located in the horizontal center of the internal member SP5 and extends vertically through it. Each groove SP5a is positioned radially outward from the third opening OP3. Each groove SP5a functions as a flow path CLP through which the refrigerant CL flows. In other words, the modified intermediate unit 33 has grooves SP5a through which the refrigerant CL flows.

[0119] In particular, as shown in Figure 13, each groove SP5a is composed of a downward groove SP5a1 located on the upper side of the inner member SP5, an upward groove SP5a2 located on the lower side of the inner member SP5, and a connecting portion SP5a3 located in the vertical center of the inner member SP5.

[0120] The downward groove SP5a1 has a shape that recesses downward from the upper surface SP4U of the inner member SP5 and extends along the circumferential direction of the inner member SP5. That is, the upper side of the downward groove SP5a1 is open.

[0121] The downward groove SP5a1 of one groove SP5a and the downward groove SP5a1 of the other groove SP5a are arranged symmetrically with respect to the central axis of the inner member SP5. However, the downward groove SP5a1 of one groove SP5a and the downward groove SP5a1 of the other groove SP5a may be arranged asymmetrically with respect to the central axis of the inner member SP5.

[0122] The upward groove SP5a2 has a shape that is recessed upward from the lower surface of the inner member SP5 and extends along the circumferential direction of the inner member SP5. In other words, the lower side of the upward groove SP5a2 is open.

[0123] The upward groove SP5a2 of one groove SP5a and the upward groove SP5a2 of the other groove SP5a are arranged symmetrically with respect to the central axis of the inner member SP5. However, the upward groove SP5a2 of one groove SP5a and the upward groove SP5a2 of the other groove SP5a may be arranged asymmetrically with respect to the central axis of the inner member SP5.

[0124] In one groove section SP5a, the downward groove SP5a1 and the upward groove SP5a2 are connected via a connecting section SP5a3 that penetrates in the vertical direction. That is, the connecting section SP5a3 connects the downward groove SP5a1 and the upward groove SP5a2. Similarly to one groove section SP5a, in the other groove section SP5a, the downward groove SP5a1 and the upward groove SP5a2 are also connected via the connecting section SP5a3.

[0125] In particular, as shown in Figure 12, in the modified example, when the sail drive 3 is positioned facing forward (see also Figure 4), the upper flow channel inlet 31Pi is located above the front side of the internal member SP5, and the first upper flow channel outlet 31Po1 is located above the rear side of the internal member SP5. Also, the lower flow channel outlet 32Po is located below the front side of the internal member SP5, and the first lower flow channel inlet 32Pi1 is located below the rear side of the internal member SP5.

[0126] In this case, the internal member SP5 is positioned such that the connecting portion SP5a3 of one groove SP5a is located on the front side of the internal member SP5, and the connecting portion SP5a3 of the other groove SP5a is located on the rear side of the internal member SP5. Then, in a plan view, the upper flow inlet 31Pi, the connecting portion SP5a3 of one groove SP5a, and the lower flow outlet 32Po overlap. Therefore, the lower flow outlet 32Po and the upper flow inlet 31Pi are connected by one groove SP5a (particularly the connecting portion SP5a3 of one groove SP5a). In other words, the groove SP5a connects the lower flow outlet 32Po and the upper flow inlet 31Pi. This allows the refrigerant CL to flow from the lower flow outlet 32Po towards the upper flow inlet 31Pi.

[0127] Furthermore, in a plan view, the first upper flow channel outlet 31Po1, the connecting portion SP5a3 of the other groove SP5a, and the first lower flow channel inlet 32Pi1 overlap. Therefore, the other groove SP5a (especially the connecting portion SP5a3 of the other groove SP5a) connects the first upper flow channel outlet 31Po1 and the first lower flow channel inlet 32Pi1. In other words, the groove SP5a connects the lower flow channel inlet 32Pi (the first lower flow channel inlet 32Pi1 in a modified example) and the upper flow channel outlet 31Po (the first upper flow channel outlet 31Po1 in a modified example). This allows the refrigerant CL to flow from the first upper flow channel outlet 31Po1 towards the first lower flow channel inlet 32Pi1.

[0128] On the other hand, as shown in the left diagram of Figure 14 in particular, when the sail drive 3 is positioned facing backward (see also Figure 5), the first upper flow channel outlet 31Po1 is located above the front side of the internal member SP5, and the upper flow channel inlet 31Pi is located above the rear side of the internal member SP5. In addition, the lower flow channel outlet 32Po is located below the front side of the internal member SP5, and the first lower flow channel inlet 32Pi1 is located below the rear side of the internal member SP5.

[0129] In this case, the internal member SP5 is positioned such that the connecting portion SP5a3 of one groove SP5a is located on the right side of the internal member SP5, and the connecting portion SP5a3 of the other groove SP5a is located on the left side of the internal member SP5. That is, the internal member SP5 shown in Figure 12 is rotated 90 degrees clockwise in a plan view around an axis along the vertical direction. Then, in a plan view, the first upper flow channel outlet 31Po1 and the downward groove SP5a1 of one groove SP5a overlap, and the first lower flow channel inlet 32Pi1 and the upward groove SP5a2 of one groove SP5a overlap. Therefore, the first upper flow channel outlet 31Po1 and the first lower flow channel inlet 32Pi1 are connected by one groove SP5a.

[0130] As a result, the refrigerant CL flowing out from the first upper flow channel outlet 31Po1 flows into the downward groove SP5a1 of one of the grooves SP5a. The refrigerant CL that has flowed into the downward groove SP5a1 of one of the grooves SP5a flows along the downward groove SP5a1, that is, along the circumferential direction of the inner member SP5 (clockwise in a plan view in the modified example). The refrigerant CL then flows into the upward groove SP5a2 (of one of the grooves SP5a) via the connecting portion SP5a3 (of one of the grooves SP5a). The refrigerant CL that has flowed into the upward groove SP5a2 flows along the upward groove SP5a2, that is, along the circumferential direction of the inner member SP5 (clockwise in a plan view in the modified example), and flows into the first lower flow channel inlet 32Pi1.

[0131] Furthermore, in a plan view, the upper channel inlet 31Pi and the downward groove SP5a1 of the other groove SP5a overlap, and the lower channel outlet 32Po and the upward groove SP5a2 of the other groove SP5a overlap. Therefore, the other groove SP5a connects the lower channel outlet 32Po and the upper channel inlet 31Pi.

[0132] As a result, the refrigerant CL flowing out from the lower flow path outlet 32Po flows into the upward groove SP5a2 of the other groove SP5a. The refrigerant CL that has flowed into the upward groove SP5a2 of the other groove SP5a flows along the upward groove SP5a2, that is, along the circumferential direction of the inner member SP5 (counterclockwise in the modified example in a plan view). The refrigerant CL then flows into the downward groove SP5a1 (of the other groove SP5a) via the connecting part SP5a3 (of the other groove SP5a). The refrigerant CL that has flowed into the downward groove SP5a1 flows along the downward groove SP5a1, that is, along the circumferential direction of the inner member SP5 (counterclockwise in the modified example in a plan view), and flows into the upper flow path inlet 31Pi. In other words, even in the modified intermediate unit 33, the flow path CLP of the refrigerant CL is switched by rotating the inner member SP5 around an axis along the vertical direction.

[0133] From the perspective of achieving a simple configuration for switching the flow path CLP of the refrigerant CL, it is desirable that the intermediate unit 33 has a groove SP5a through which the refrigerant CL flows, as shown in the modified example.

[0134] From the perspective of reliably achieving the switching of the refrigerant CL flow path CLP even with a simple configuration, the following configuration is desirable. That is, as in the modified example, it is desirable that the groove SP5a connects the lower flow path inlet 32Pi (first lower flow path inlet 32Pi1 in the modified example) and the upper flow path outlet 31Po (first upper flow path outlet 31Po1 in the modified example). Furthermore, it is desirable that the groove SP5a connects the lower flow path outlet 32Po and the upper flow path inlet 31Pi.

[0135] From the viewpoint of switching the flow path CLP of refrigerant CL by allowing refrigerant CL flowing from above to below the internal member SP5 and refrigerant CL flowing from below to above the internal member SP5, the following configuration is desirable. That is, as in the modified example, it is desirable that the groove SP5a includes a downward groove SP5a1 that is recessed downward, an upward groove SP5a2 that is recessed upward, and a connecting portion SP5a3 that connects the downward groove SP5a1 and the upward groove SP5a2.

[0136] The modified configuration of the intermediate unit 33 is not limited to those described above. More details are as follows. Figure 15 is an overhead perspective view showing another modified configuration of the intermediate unit 33, disassembled vertically. The intermediate unit 33 shown in Figure 15 has the same configuration as the intermediate unit 33 shown in Figures 12, 13, and 14, except that the outer circumferential surface of the groove SP5a of the internal member SP5 is removed. Even with the configuration of the intermediate unit 33 shown in Figure 15, it is possible to achieve the refrigerant flow CL shown in Figures 12, 13, and 14. In other words, the intermediate unit 33 shown in Figure 15 also has a flow path switching function. Furthermore, from the viewpoint of reducing pressure loss in the groove SP5a, the intermediate unit 33 shown in Figure 15 is preferable to the intermediate unit 33 shown in Figure 12, etc.

[0137] [4. Addendum] The sail drive 3 and vessel 1 described in this embodiment can also be expressed as the sail drive and vessel shown in the following appendix.

[0138] Note (1) The sail drive is, Lower unit and An upper unit positioned above the lower unit, such that its orientation can be changed relative to the lower unit, The unit comprises an intermediate unit positioned between the lower unit and the upper unit, The refrigerant flowing between the lower unit and the upper unit via the intermediate unit is cooled in the lower unit. The intermediate unit switches the flow path of the refrigerant.

[0139] The sail drive in Appendix (2) is the same as the sail drive described in Appendix (1), The aforementioned flow path is The lower channel provided in the lower unit, The upper unit has an upper flow path, The intermediate unit maintains the connection relationship between the lower flow path and the upper flow path even when the orientation of the upper unit relative to the lower unit is changed.

[0140] The sail drive in Appendix (3) is the same as the sail drive described in Appendix (2), The lower channel includes a lower channel inlet and a lower channel outlet. The upper channel includes an upper channel inlet and an upper channel outlet, The intermediate unit maintains communication between the lower flow channel inlet and the upper flow channel outlet, and also maintains communication between the lower flow channel outlet and the upper flow channel inlet, even when the orientation of the upper unit relative to the lower unit is changed.

[0141] The sail drive in Appendix (4) is the same as the sail drive described in Appendix (3), The intermediate unit has grooves formed through which the refrigerant flows.

[0142] The sail drive in Appendix (5) is the same as the sail drive described in Appendix (4), The groove portion is A downward-facing groove that curves downwards, An upward-facing groove that curves downwards, It includes a connecting portion that connects the downward groove and the upward groove.

[0143] The sail drive in Appendix (6) is the same as the sail drive described in Appendix (4) or (5), The groove connects the lower channel inlet and the upper channel outlet, and also connects the lower channel outlet and the upper channel inlet.

[0144] The sail drive in Appendix (7) is the sail drive described in any of Appendix (1) to (3), The intermediate unit has a plurality of switching members.

[0145] The sail drive in Appendix (8) is the same as the sail drive described in Appendix (7), The aforementioned multiple switching members are An upper member having a first groove and a second groove, A lower member having a third groove and a fourth groove, A middle member having a pair of through holes, The intermediate member is positioned between the upper member and the lower member. The upper member is positioned such that the openings of the first groove and the second groove face the middle member. The lower member is positioned such that the openings of the third groove and the fourth groove face the middle member.

[0146] The sail drive in Appendix (9) is the same as the sail drive described in Appendix (8), The first groove is connected to a first upper port formed downward from the upper surface of the upper member and is recessed upward, The second groove is connected to a second upper port formed downward from the upper surface of the upper member and is recessed upward, The third groove is connected to the first lower port formed upward from the lower surface of the lower member and is recessed downward, The fourth groove is connected to a second lower port formed upward from the lower surface of the lower member and is recessed downward.

[0147] The sail drive in Appendix (10) is the same as the sail drive described in Appendix (9), The first upper port and the second upper port are arranged symmetrically with respect to the central axis of the upper member in a plan view.

[0148] The sail drive in Appendix (11) is the same as the sail drive described in Appendix (9) or (10), The first lower port and the second lower port are arranged symmetrically with respect to the central axis of the lower member in a plan view.

[0149] The sail drive in Appendix (12) is the sail drive described in any of Appendix (8) to (11), The upper member, the middle member, and the lower member are arranged side by side in the vertical direction. When the central member rotates around an axis along the vertical direction, the flow path switches.

[0150] The sail drive in Appendix (13) is the same as the sail drive described in Appendix (12), The aforementioned intermediate unit is A first communication mode in which the first groove and the third groove are in communication and the second groove and the fourth groove are in communication, It has a second communication mode in which the first groove and the fourth groove are in communication and the second groove and the third groove are in communication, When the central member rotates around the axis, the first communication mode and the second communication mode are switched.

[0151] The sail drive in Appendix (14) is the sail drive described in any of Appendix (8) to (11), When the positions of the pair of through holes are changed, the flow path is switched.

[0152] The sail drive in Appendix (15) is the same as the sail drive described in Appendix (14), The aforementioned intermediate unit is A first communication mode in which the first groove and the third groove are in communication and the second groove and the fourth groove are in communication, It has a second communication mode in which the first groove and the fourth groove are in communication and the second groove and the third groove are in communication, When the positions of the pair of through holes are changed, the first communication mode and the second communication mode are switched.

[0153] The sail drive in Appendix (16) is the sail drive described in any of Appendix (8) to (15), The intermediate member has a positioning portion that corresponds to at least one of the upper member and the lower member.

[0154] The sail drive in Appendix (17) is the same as the sail drive described in Appendix (16), The positioning portion protrudes toward at least one of the upper member and the lower member.

[0155] The vessels specified in Appendix (18) shall be equipped with a sail drive as described in any of Appendix (1) through (17).

[0156] Although embodiments of the present invention have been described above, the scope of the present invention is not limited thereto, and it can be expanded or modified without departing from the spirit of the invention. [Industrial applicability]

[0157] This invention can be used, for example, in ships such as sailing ships. [Explanation of Symbols]

[0158] 1 ship 3 Sail Drive 31 Upper Unit 31P Upper channel 31Pi Upper channel inlet 31Po Upper flow channel outlet 32 Lower Unit 32P Lower channel 32Pi Lower channel inlet 32Po Lower channel outlet 33 Intermediate Units 33M1 1st Communication Mode 33M2 Second Communication Mode CL refrigerant CLP flow path (refrigerant flow path) PD1 First Lower Port PD2 Second Lower Port PU1 1st upper port PU2 2nd upper port SP switching component SP1 Upper member SP1AX central axis (central axis of the upper member) SP1a First groove SP1b 2nd groove SP2 lower part SP2AX central axis (central axis of the lower member) SP2a 3rd groove SP2b 4th groove SP3 Intermediate Member SP3a through hole SP3b Positioning section SP5a Groove SP5a1 Downward groove SP5a2 Upward groove SP5a3 communication part

Claims

1. Lower unit and An upper unit positioned above the lower unit, such that its orientation can be changed relative to the lower unit, The unit comprises an intermediate unit positioned between the lower unit and the upper unit, The refrigerant flowing between the lower unit and the upper unit via the intermediate unit is cooled in the lower unit. The intermediate unit is a sail drive that switches the flow path of the refrigerant.

2. The aforementioned flow path is The lower channel provided in the lower unit, The upper unit has an upper flow path, The sail drive according to claim 1, wherein the intermediate unit maintains the connection relationship between the lower flow path and the upper flow path even when the orientation of the upper unit relative to the lower unit is changed.

3. The lower channel includes a lower channel inlet and a lower channel outlet. The upper channel includes an upper channel inlet and an upper channel outlet, The sail drive according to claim 2, wherein the intermediate unit connects the lower flow channel inlet and the upper flow channel outlet, and also connects the lower flow channel outlet and the upper flow channel inlet, even when the orientation of the upper unit relative to the lower unit is changed.

4. The sail drive according to claim 3, wherein the intermediate unit has grooves formed through which the refrigerant flows.

5. The groove portion is A downward-facing groove that curves downwards, An upward-facing groove that curves downwards, The sail drive according to claim 4, further comprising a connecting portion that connects the downward groove and the upward groove.

6. The sail drive according to claim 4, wherein the groove connects the lower channel inlet and the upper channel outlet, and also connects the lower channel outlet and the upper channel inlet.

7. The sail drive according to claim 1, wherein the intermediate unit has a plurality of switching members.

8. The aforementioned multiple switching members are An upper member having a first groove and a second groove, A lower member having a third groove and a fourth groove, A middle member having a pair of through holes, The intermediate member is positioned between the upper member and the lower member. The upper member is positioned such that the openings of the first groove and the second groove face the middle member. The sail drive according to claim 7, wherein the lower member is positioned such that the openings of the third groove and the fourth groove face the middle member.

9. The first groove is connected to a first upper port formed downward from the upper surface of the upper member and is recessed upward, The second groove is connected to a second upper port formed downward from the upper surface of the upper member and is recessed upward, The third groove is connected to the first lower port formed upward from the lower surface of the lower member and is recessed downward, The sail drive according to claim 8, wherein the fourth groove is connected to a second lower port formed upward from the lower surface of the lower member and is recessed downward.

10. The sail drive according to claim 9, wherein the first upper port and the second upper port are arranged symmetrically with respect to the central axis of the upper member in a plan view.

11. The sail drive according to claim 9, wherein the first lower port and the second lower port are arranged symmetrically with respect to the central axis of the lower member in a plan view.

12. The upper member, the middle member, and the lower member are arranged side by side in the vertical direction. The sail drive according to claim 8, wherein the flow path is switched when the central member rotates about an axis along the vertical direction.

13. The aforementioned intermediate unit is A first communication mode in which the first groove and the third groove are in communication and the second groove and the fourth groove are in communication, It has a second communication mode in which the first groove and the fourth groove are in communication and the second groove and the third groove are in communication, The sail drive according to claim 12, wherein when the central member rotates around the axis, the first communication mode and the second communication mode are switched.

14. The sail drive according to claim 8, wherein the flow path is switched when the position of the pair of through holes is changed.

15. The aforementioned intermediate unit is A first communication mode in which the first groove and the third groove are in communication and the second groove and the fourth groove are in communication, It has a second communication mode in which the first groove and the fourth groove are in communication and the second groove and the third groove are in communication, The sail drive according to claim 14, wherein the position of the pair of through holes is changed, and the first communication mode and the second communication mode are switched.

16. The sail drive according to claim 8, wherein the intermediate member has a positioning portion corresponding to at least one of the upper member and the lower member.

17. The sail drive according to claim 16, wherein the positioning portion protrudes toward at least one of the upper member and the lower member.

18. A vessel comprising a sail drive according to any one of claims 1 to 17.

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