Patent Grant
10071793
The priority application number JP2015-106582, entitled “Jet Propulsion Boat”, and filed May 26, 2015, by Satoshi Koyano and Shu Akuzawa, upon which this patent application is based, is hereby incorporated by reference in its entirety.
Field of the Invention
The present invention relates to a jet propulsion boat.
Description of the Background Art
A jet propulsion boat including a plurality of discharge ports from which jets of water are discharged is known in general. Such a jet propulsion boat is disclosed in U.S. Pat. No. 8,490,558, for example.
U.S. Pat. No. 8,490,558 discloses a jet boat including a boat body, a left engine and a right engine provided on the boat body, a left jet propulsion unit and a right jet propulsion unit configured to generate jets of water by power of the left engine and power of the right engine, respectively, and a valve configured to switch destinations to which the jets of water are supplied. In this jet boat, the jet of water from the left jet propulsion unit is supplied to and discharged from at least one of a left main discharge port provided in a rear portion of the boat body, a rear discharge port fixedly provided in a left rear portion of the boat body, and a front discharge port fixedly provided in a right front portion of the boat body by the opening and closing of the valve. Furthermore, the jet of water from the right jet propulsion unit is supplied to and discharged from at least one of a right main discharge port provided in the rear portion of the boat body, a rear discharge port fixedly provided in a right rear portion of the boat body, and a front discharge port fixedly provided in a left front portion of the boat body by the opening and closing of the valve.
In the jet boat according to U.S. Pat. No. 8,490,558, the rear discharge ports and the front discharge ports are fixedly provided, and hence the discharge directions of the jets of water discharged from the rear discharge ports and the front discharge ports are disadvantageously fixed. In this case, it is conceivably necessary to exactly control the opening and closing of the valve and supply a proper jet of water to at least one of the main discharge port, the rear discharge port, and the front discharge port each time control for steering the boat body is performed on the basis of boat operation of a user in the jet boat. Therefore, it is necessary to properly control the opening and closing of the valve for each boat operation of the user, and delay in the steering of the jet boat corresponding to boat operation of the user is likely to occur.
The present invention has been proposed in order to solve the aforementioned problem, and to provide a jet propulsion boat in which delay in the steering of the jet propulsion boat corresponding to boat operation of a user is significantly reduced or prevented.
A jet propulsion boat according to an aspect of the present invention includes a boat body, a propulsion device configured to generate a jet of water for propelling the boat body, a first discharge portion provided in a rear portion of the boat body, including a first discharge port from which the jet of water is discharged, a second discharge portion including a second discharge port from which the jet of water is discharged, configured to be rotatable so as to change the discharge direction of the second discharge port, and a jet path configured to connect the propulsion device to the first discharge portion and the second discharge portion. The term “provided in a rear portion” means that the first discharge portion is provided rearward relative to the center of gravity of the boat body.
In the jet propulsion boat according to this aspect, as hereinabove described, the second discharge portion is configured to be rotatable so as to change the discharge direction of the second discharge port. Thus, the second discharge portion is rotated to correspond to boat operation of a user, whereby the discharge direction of the second discharge port is promptly changed, and the jet propulsion boat is steered. Thus, delay in the steering of the jet propulsion boat corresponding to the boat operation of the user is significantly reduced or prevented. Furthermore, the discharge direction of the second discharge port is simply changed to a second direction of a right-left direction on the basis of the boat operation of the user associated with movement in a first direction of the right-left direction, for example, whereby the jet propulsion boat is easily moved in the first direction of the right-left direction without exactly controlling the amount of the jet of water discharged from the second discharge port. Thus, steering corresponding to movement in the right-left direction or the like is performed without complicating control for discharging the jet of water, and hence the delay in the steering of the jet propulsion boat corresponding to the boat operation of the user is significantly reduced or prevented. Moreover, the discharge direction of the second discharge port is changed in the second discharge portion, whereby it is not necessary to provide a plurality of fixed discharge ports having discharge directions different from each other. Thus, the number of discharge ports is reduced, and hence a mechanism configured to supply the jet of water to the discharge ports is simplified while control of the amount of the jet of water is simplified. Thus, the delay in the steering of the jet propulsion boat corresponding to the boat operation of the user is significantly reduced or prevented.
In the aforementioned jet propulsion boat according to this aspect, the second discharge portion is preferably provided in a front portion of the boat body. According to this structure, the boat body is easily rotationally moved about the center of gravity and is easily moved in the right-left direction while being prevented from rotation by the first discharge portion and the second discharge portion arranged in a front-back direction through the center of gravity. The term “provided in a front portion” means that the second discharge portion is provided forward relative to the center of gravity of the boat body.
In the aforementioned jet propulsion boat according to this aspect, the second discharge portion is preferably provided on a centerline of the boat body that extends from the bow of the boat body toward the stern of the boat body. According to this structure, the jet propulsion boat is properly steered without providing a plurality of second discharge portions simply by properly rotationally controlling the second discharge portion arranged on the centerline. Thus, an increase in the number of components is significantly reduced or prevented, and the control of the amount of the jet of water is further simplified.
In the aforementioned jet propulsion boat according to this aspect, the second discharge portion is preferably configured to be rotatable 360 degrees in a horizontal plane and to be rotated by an arbitrary angle in the horizontal plane so as to change the discharge direction of the second discharge port. According to this structure, the jet of water is discharged in any direction of 360 degrees in the horizontal plane from the second discharge port, and hence complication of the control for discharging the jet of water is reliably significantly reduced or prevented. Furthermore, the second discharge portion is rotated by 360 degrees in the horizontal plane, whereby the jet of water is discharged in an arbitrary direction in the horizontal plane from the second discharge port without providing a plurality of second discharge ports. Thus, an increase in the number of components is significantly reduced or prevented, and the control of the amount of the jet of water is further simplified.
In this case, the second discharge portion is preferably L-shaped so as to discharge the jet of water supplied from above through the jet path in a substantially horizontal direction from the second discharge port. According to this structure, the jet of water supplied from above is easily discharged in any direction of 360 degrees in the horizontal plane from the second discharge port by the L-shaped second discharge portion.
The aforementioned jet propulsion boat according to this aspect preferably further includes a drive source configured to rotationally drive the second discharge portion so as to change the discharge direction of the second discharge port. According to this structure, the drive source is controlled in the jet propulsion boat such that the discharge direction of the second discharge port is automatically controlled to be a proper direction, unlike the case where the user manually rotates the second discharge portion and sets the discharge direction of the second discharge port.
In this case, the second discharge portion is preferably rotatably connected to the jet path, and includes a tube member provided with the second discharge port and a rotary shaft connected to the drive source, configured to rotate the tube member. According to this structure, the discharge direction of the second discharge port of the tube member is automatically changed by the drive force of the drive source transmitted through the rotary shaft.
In the aforementioned jet propulsion boat according to this aspect, the boat body preferably includes a storing portion configured to store the second discharge portion. According to this structure, the currently-unused second discharge portion is stored such that the possibility that the second discharge portion serves as a resistance during propulsion is significantly reduced, and hence a reduction in the speed of the jet propulsion boat caused by the second discharge portion is significantly reduced or prevented.
In this case, the storing portion preferably includes an openable and closable lid in an opening of the storing portion. According to this structure, the second discharge portion is easily switched to a storing state or a non-storing state by opening or closing the lid.
In the aforementioned jet propulsion boat according to this aspect, the jet path preferably extends from a stern side toward a bow side not to intersect with a centerline of the boat body that extends from the bow of the boat body toward the stern of the boat body. According to this structure, the jet path does not intersect with the centerline of the boat body, and hence the possibility that the jet path makes it impossible for another device to be arranged in the vicinity of the centerline in the boat body is effectively significantly reduced or prevented.
The aforementioned jet propulsion boat according to this aspect preferably further includes a jet control valve provided in the jet path and a valve controller configured to control the jet control valve to supply the jet of water from the propulsion device to at least one of the first discharge port and the second discharge port. According to this structure, the valve controller is properly controlled such that the jet of water from the propulsion device is properly supplied to at least one of the first discharge port and the second discharge port, and hence the control for discharging the jet of water is reliably performed. Furthermore, the openable and closable jet control valve and the rotatable second discharge portion are used together such that the delay in the steering of the jet propulsion boat corresponding to the boat operation of the user is more significantly reduced or prevented, as compared with the case where only the openable and closable jet control valve is used.
In this case, the propulsion device preferably includes a first propulsion device and a second propulsion device, and the valve controller is preferably configured to control the jet control valve to supply the jet of water from at least one of the first propulsion device and the second propulsion device to the second discharge port. According to this structure, it is not necessary to control the jet control valve to distribute jets of water from the first and second propulsion devices to a plurality of second discharge portions, and hence complication of control for discharging the jets of water is effectively significantly reduced or prevented.
In the aforementioned structure in which the propulsion device includes the first propulsion device and the second propulsion device, the first discharge portion preferably includes a pair of first discharge portions, the jet path preferably includes a first jet path configured to connect the first propulsion device to the second discharge portion and a second jet path configured to connect the second propulsion device to the second discharge portion, the first propulsion device is preferably connected to the first one of the pair of first discharge portions, the second propulsion device is preferably connected to the second one of the pair of first discharge portions, the jet control valve preferably includes a first three-way control valve provided in a portion where the first jet path between the first propulsion device and the first one of the pair of first discharge portions is branched and a second three-way control valve provided in a portion where the second jet path between the second propulsion device and the second one of the pair of first discharge portions is branched, and the valve controller is preferably configured to control the first three-way control valve and the second three-way control valve to selectively supply the jet of water to at least one of the second discharge portion, the first one of the pair of first discharge portions, and the second one of the pair of first discharge portions. According to this structure, the valve controller controls the first three-way control valve and the second three-way control valve to properly supply the jet of water to at least one of the second discharge portion, the first one of the pair of first discharge portions, and the second one of the pair of second discharge portions, whereby the control for discharging the jet of water is more reliably performed.
In this case, the valve controller is preferably configured to control the first three-way control valve to supply the jet of water from the first propulsion device to the first one of the pair of first discharge portions and control the second three-way control valve to supply the jet of water from the second propulsion device to the second one of the pair of first discharge portions, when the boat body is moved forward or backward. According to this structure, the boat body is propelled by the jets of water discharged from the first one of the pair of first discharge portions and the second one of the pair of first discharge portions in the case of forward movement or backward movement not requiring fine steering control, and hence it is not necessary to rotationally control the second discharge portion. Therefore, control of the jet propulsion boat during forward movement or backward movement is simplified.
The aforementioned structure including the drive source preferably further includes a joystick configured to accept operation of a user, and the drive source is preferably configured to rotationally drive the second discharge portion on the basis of the push direction of the joystick so as to adjust the discharge direction of the second discharge port. According to this structure, pushing operation of the user on the joystick is reflected in the rotational drive of the second discharge portion, and hence the jet propulsion boat is properly moved in a movement direction intended by the user according to the intuitive boat operation of the user through the joystick.
In this case, a steering operation mode of accepting the operation of the user on a steering is preferably switched to a joystick operation mode of accepting the operation of the user on the joystick when a boat speed is not more than a prescribed speed. According to this structure, the steering operation mode is switched to the joystick operation mode in which fine boat operation of the user is reflected when the boat speed is not more than the prescribed speed and fine steering control is possible, and hence the jet propulsion boat is more properly moved in the movement direction intended by the user according to the boat operation of the user through the joystick.
The aforementioned structure including the joystick preferably further includes a shift lever, and a joystick operation mode of accepting the operation of the user on the joystick is preferably cancelled and is preferably switched to a steering operation mode of accepting the operation of the user on a steering when the user operates the shift lever. According to this structure, the user easily switches the joystick operation mode to the steering operation mode in which the shift lever is used without performing an operation to cancel the joystick operation mode separately simply by operating the shift lever.
The aforementioned structure in which the steering operation mode or the joystick operation mode is switched to the joystick operation mode or the steering operation mode preferably further includes a jet control valve provided in the jet path and a valve controller configured to control the jet control valve to supply the jet of water from the propulsion device to at least one of the first discharge port and the second discharge port, and the valve controller is preferably configured to control the jet control valve to supply the jet of water to the first discharge portion and supply the jet of water to the second discharge portion through the jet path in the joystick operation mode. According to this structure, the jet of water is supplied to both the first discharge portion and the second discharge portion by the valve controller in the joystick operation mode, and hence fine steering corresponding to the movement of the jet propulsion boat in the right-left direction or the like is properly performed by both the first discharge portion and the second discharge portion.
In this case, the valve controller is preferably configured to control the jet control valve to make the amount of the jet of water supplied to the first discharge portion and the amount of the jet of water supplied to the second discharge portion substantially equal to each other and hold the boat body at a fixed point by making the discharge direction of the first discharge port and the discharge direction of the second discharge port opposite to each other, when the joystick is not operated in the joystick operation mode. According to this structure, the boat body is reliably held at a fixed point in a state where the joystick is not operated.
The aforementioned structure including the joystick preferably further includes a switching button configured to enable the user to switch a steering operation mode of accepting the operation of the user on a steering to a joystick operation mode of accepting the operation of the user on the joystick. According to this structure, the user easily switches the steering operation mode to the joystick operation mode by pressing down the switching button.
The foregoing and other objects, features, aspects, and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.
Embodiments of the present invention are hereinafter described with reference to the drawings.
(Structure of Jet Propulsion Boat)
The structure of a jet propulsion boat 100 according to a first embodiment of the present invention is now described with reference to
The jet propulsion boat 100 includes a boat body 1 including a hull 10 and a deck 11, an engine 2 stored in the hull 10, and a jet propulsion unit 3 connected to the engine 2, as shown in
The hull 10 includes the bottom of the jet propulsion boat 100, as shown in
The deck 11 is provided to cover the hull 10 (see
The jet propulsion boat 100 is provided with a steering operation mode of accepting operation of the user on the steering 12a and the shift lever 12b and a joystick operation mode of accepting operation of the user on the joystick 12c. The mode switching button 12d is provided in order for the user to switch the steering operation mode and the joystick operation mode. The steering operation mode and the joystick operation mode are described later.
The engine 2 extends from the bow of the boat body 1 to the stern of the boat body 1 and is arranged in a rear portion of the boat body 1 on a centerline C passing through the center of the boat body 1 in the width direction. The drive force of the engine 2 is transmitted to a propulsion device 30 (see
<Structure of Jet Propulsion Unit>
The jet propulsion unit 3 has a function of generating a jet of water for propelling the boat body 1 on the basis of the drive force transmitted from the engine 2 and discharging the jet of water in an arbitrary direction. The jet propulsion unit 3 includes the propulsion device 30 in which an impeller (not shown) is stored and an injection nozzle 31 and a bucket 32 both configured to eject the jet of water generated in the propulsion device 30 in the arbitrary direction, as shown in
In the propulsion device 30, the impeller is rotated, whereby water introduced through the intake gate 10b of the hull 10 is compressed and the jet of water is generated.
The injection nozzle 31 includes a discharge port 31a from which the jet of water is discharged and a nozzle drive portion 31b (see
The jet propulsion unit 3 includes a branched path 33 that connects the propulsion device 30 and the rotary discharge portion 35 (see
The branched path 33 partially includes the jet path A and is made of a tube member in which the jet of water circulates. The branched path 33 extends from the three-way valve 34 along arrow L and is bent forward, as shown in
As shown in
The three-way valve 34 further includes a valve drive portion 34e configured to rotationally move the water stop valve 34d and a lever 34f configured to transmit the drive force of the valve drive portion 34e to the water stop valve 34d, as shown in
According to the first embodiment, the rotary discharge portion 35 includes a hollow (pipe-shaped) tube member 36 provided with the discharge port 36a and a rotary shaft 37 mounted on the tube member 36, as shown in
As shown in
The rotary shaft 37 is mounted on an inner portion of the tube member 36 by a mounting member 37a that extends in the horizontal direction. The rotary shaft 37 is connected to a rotation drive portion 37b, and the rotation drive portion 37b is driven so that the rotary shaft 37 is rotated about an axis. The rotary shaft 37 is rotated, whereby the tube member 36 is rotated by 360 degrees in the horizontal plane. The rotation drive portion 37b is an example of the “drive source” in the present invention. The rotation drive portion 37b may be a part of the rotary discharge portion 35 or separate therefrom.
The rotary discharge portion 35 is arranged in the storing portion 10a of the hull 10 of the boat body 1, as shown in
<Structure of Control System>
The jet propulsion boat 100 includes a controller 40, an ECU (engine control unit) 41a, a shift CU (control unit) 41b, a steering CU 41c, and a thruster CU 41d as a control system, as shown in
The controller 40 includes a CPU or the like and totally controls the jet propulsion boat 100. The ECU 41a controls the drive of the engine 2 according to the amount of push of the shift lever 12b or the joystick 12c on the basis of an instruction from the controller 40. The shift CU 41b controls switching of the transmission 2b according to the amount of push of the shift lever 12b or the joystick 12c on the basis of an instruction from the controller 40. The steering CU 41c drives the nozzle drive portion 31b and the bucket drive portion 32a according to the rotation angle of the steering 12a or the push direction of the joystick 12c on the basis of an instruction from the controller 40. Thus, the rotation of the injection nozzle 31 and the rotation of the bucket 32 are controlled. The thruster CU 41d drives the valve drive portion 34e and the rotation drive portion 37b according to the rotation angle of the steering 12a or the push direction of the joystick 12c on the basis of an instruction from the controller 40. Thus, the switching of the three-way valve 34 (the movement of the water stop valve 34d) and the rotation of the tube member 36 of the rotary discharge portion 35 in the horizontal plane are controlled.
The jet propulsion boat 100 further includes a sensor portion 42 configured to detect the state of the jet propulsion boat 100. The sensor portion 42 includes a speed sensor 42a configured to detect the speed of the boat body 1 (boat speed) from the rotational speed of the engine 2.
The controller 40 switches between the steering operation mode of accepting operation of the user on the steering 12a and the joystick operation mode of accepting operation of the user on the joystick 12c when the mode switching mode 12d is pressed down. When switching the steering operation mode to the joystick operation mode (when the mode switching button 12d is pressed down), the controller 40 switches the steering operation mode to the joystick operation mode if the boat speed detected by the speed sensor 42a is not more than a prescribed speed but does not switch the steering operation mode to the joystick operation mode if the boat speed is more than the prescribed speed.
<Steering Control in Steering Operation Mode>
Steering control performed by the controller 40 in the steering operation mode is now described with reference to
In the steering operation mode, the controller 40 accepts operation of the user on the steering 12a and the shift lever 12b (see
When the movement direction of the jet propulsion boat 100 is forward (FWD) or in an angular range (storing angular range) of a prescribed angle (±40 degrees, for example) from FWD in the steering operation mode, the rotary discharge portion 35 is in the storing state (see
The discharge direction and the discharge amount of each of the discharge port 36a of the rotary discharge portion 35 and the discharge port 31a of the injection nozzle 31 are determined by the controller 40 according to the rotation angle of the steering 12a and the amount of push of the shift lever 12b during the boat operation of the user. The controller 40 properly controls the engine 2, the transmission 2b, and the jet propulsion unit 3 through the ECU 41a, the shift CU 41b, the steering CU 41c, and the thruster CU 41d according to the determined discharge direction and discharge amount.
The injection nozzle 31 is rotationally driven by the nozzle drive portion 31b while the bucket 32 is rotationally driven by the bucket drive portion 32a, whereby the discharge direction of the discharge port 31a of the injection nozzle 31 is adjusted. Furthermore, the rotary discharge portion 35 is rotationally driven by the rotation drive portion 37b, whereby the discharge direction of the discharge port 36a of the rotary discharge portion 35 is adjusted. The reaction force of the jet of water from the discharge port 31a and the reaction force of the jet of water from the discharge port 36a serve as propulsion force, and the jet propulsion boat 100 is moved. The discharge direction of the discharge port 31a and the discharge direction of the discharge port 36a are made opposite to the movement direction of the jet propulsion boat 100, whereby it is not necessary to exactly adjust the discharge amount, unlike the case where the discharge portions (discharge ports) are fixedly provided.
Specifically, directions shown by a dotted arrow and a solid arrow in
<Steering Control in Joystick Operation Mode>
Steering control performed by the controller 40 in the joystick operation mode is now described with reference to
In the joystick operation mode, the controller 40 (see
In the joystick operation mode, the jet of water is discharged by a prescribed amount in a prescribed direction from each of the discharge port 36a of the rotary discharge portion 35 and the discharge port 31a of the injection nozzle 31. At this time, the discharge direction and the discharge amount of each of the discharge port 36a of the rotary discharge portion 35 and the discharge port 31a of the injection nozzle 31 are determined by the controller 40 according to the push direction and the amount of push of the joystick 12c during the boat operation of the user. The controller 40 controls properly controls the engine 2, the transmission 2b, and the jet propulsion unit 3 through the ECU 41a, the shift CU 41b, the steering CU 41c, and the thruster CU 41d according to the determined discharge direction and discharge amount. In other words, the rotary discharge portion 35 is rotationally driven by the rotation drive portion 37b on the basis of the push direction of the joystick 12c, whereby the discharge direction of the discharge port 36a is adjusted. The discharge directions BD and FD in the joystick operation mode are the same as those in the steering operation mode shown in
In the joystick operation mode, fine steering control is required, unlike in the steering operation mode, and hence the rotary discharge portion 35 is in the non-storing state (see
When the user rotationally moves the joystick 12c while pushing the same, steering control is performed such that the jet propulsion boat 100 is rotated, as shown in
When the user does not operate the joystick 12c, steering control is performed such that the jet propulsion boat 100 is held at a fixed point, as shown in
(Effects of First Embodiment)
According to the first embodiment, the following effects are obtained.
According to the first embodiment, as hereinabove described, the rotary discharge portion 35 is configured to be rotatable so as to change the discharge direction of the discharge port 36a. Thus, the rotary discharge portion 35 is rotated to correspond to the boat operation of the user, whereby the discharge direction of the discharge port 36a is promptly changed, and the jet propulsion boat 100 is steered. Thus, delay in the steering of the jet propulsion boat 100 corresponding to the boat operation of the user is significantly reduced or prevented. Furthermore, the discharge direction of the discharge port 36a is simply changed to a second direction of a right-left direction on the basis of the boat operation of the user associated with movement in a first direction of the right-left direction, for example, whereby the jet propulsion boat 100 is easily moved in the first direction of the right-left direction without exactly controlling the amount of the jet of water discharged from the discharge port 36a. Thus, steering corresponding to movement in the right-left direction or the like is performed without complicating control for discharging the jet of water, and hence the delay in the steering of the jet propulsion boat 100 corresponding to the boat operation of the user is significantly reduced or prevented. Moreover, the discharge direction of the discharge port 36a is changed in the rotary discharge portion 35, whereby it is not necessary to provide a plurality of fixed discharge ports having discharge directions different from each other. Thus, the number of discharge ports is reduced, and hence a mechanism (jet propulsion unit 3) configured to supply the jet of water to the discharge ports is simplified while control of the amount of the jet of water is simplified. Thus, the delay in the steering of the jet propulsion boat 100 corresponding to the boat operation of the user is significantly reduced or prevented.
According to the first embodiment, as hereinabove described, the rotary discharge portion 35 is provided in the front portion of the boat body 1, whereby the boat body 1 is easily rotationally moved about the center of gravity G and is easily moved in the right-left direction while being prevented from rotation by the injection nozzle 31 and the rotary discharge portion 35 arranged in the front-back direction through the center of gravity G.
According to the first embodiment, as hereinabove described, one rotary discharge portion 35 is provided on the centerline C of the boat body 1 that extends from the bow of the boat body 1 toward the stern of the boat body 1, whereby the jet propulsion boat 100 is properly steered without providing a plurality of rotary discharge portions simply by properly rotationally controlling one rotary discharge portion 35 arranged on the centerline C. Thus, an increase in the number of components is significantly reduced or prevented, and the control of the amount of the jet of water is further simplified. Furthermore, both the rotary discharge portion 35 and the injection nozzle 31 are provided on the centerline C, whereby control for holding the boat body 1 at a fixed point or the like is more easily performed.
According to the first embodiment, as hereinabove described, the tube member 36 of the rotary discharge portion 35 is configured to be rotatable 360 degrees in the horizontal plane, and the tube member 36 is configured to be rotated by the arbitrary angle in the horizontal plane so as to change the discharge direction of the discharge port 36a in an arbitrary horizontal direction. Thus, the jet of water is discharged in any direction of 360 degrees in the horizontal plane from the discharge port 36a, and hence complication of the control for discharging the jet of water is reliably significantly reduced or prevented. Furthermore, the tube member 36 is rotated by 360 degrees in the horizontal plane, whereby the jet of water is discharged in the arbitrary direction from only one discharge port 36a without providing a plurality of discharge ports. Thus, an increase in the number of components is significantly reduced or prevented, and the control of the amount of the jet of water is further simplified.
According to the first embodiment, as hereinabove described, the tube member 36 of the rotary discharge portion 35 is L-shaped so as to discharge the jet of water supplied from above through the jet path A in a substantially horizontal direction from the discharge port 36a. Thus, the jet of water supplied from above is easily discharged in any direction of 360 degrees in the horizontal plane from the discharge port 36a by the L-shaped tube member 36 of the rotary discharge portion 35.
According to the first embodiment, as hereinabove described, the jet propulsion boat 100 is provided with the rotation drive portion 37b configured to rotationally drive the rotary discharge portion 35 so as to change the discharge direction of the discharge port 36a. Thus, the rotation drive portion 37b is controlled in the jet propulsion boat 100 such that the discharge direction of the discharge port 36a is automatically controlled to be a proper direction, unlike the case where the user manually rotates the rotary discharge portion 35 and sets the discharge direction of the discharge port 36a.
According to the first embodiment, as hereinabove described, the rotary discharge portion 35 is rotatably connected to the jet path A and includes the tube member 36 provided with the discharge port 36a and the rotary shaft 37 connected to the rotation drive portion 37b, configured to rotate the tube member 36. Thus, the discharge direction of the discharge port 36a of the tube member 36 is automatically changed by the drive force of the rotation drive portion 37b transmitted through the rotary shaft 37.
According to the first embodiment, as hereinabove described, the storing portion 10a configured to store the rotary discharge portion 35 is provided in the hull 10 of the boat body 1, whereby the currently-unused rotary discharge portion 35 is stored such that the possibility that the rotary discharge portion 35 serves as a resistance during propulsion is significantly reduced, and hence a reduction in the speed of the jet propulsion boat 100 (boat speed) caused by the rotary discharge portion 35 is significantly reduced or prevented.
According to the first embodiment, as hereinabove described, the openable and closable lid 10d is provided in the opening 10c of the storing portion 10a, whereby the rotary discharge portion 35 is easily switched to the storing state or the non-storing state by opening or closing the lid 10d.
According to the first embodiment, as hereinabove described, the three-way valve 34 of the jet path A is provided on the centerline C, and the branched path 33 of the jet path A is provided along arrow L relative to the centerline C of the boat body 1. Consequently, the jet path A extends from the stern side toward the bow side not to intersect with the centerline C of the boat body 1. Thus, the jet path A does not intersect with the centerline C of the boat body 1, and hence the possibility that the jet path A makes it impossible for another device (such as the engine 2) to be arranged in the vicinity of the centerline C in the boat body 1 is effectively significantly reduced or prevented.
According to the first embodiment, as hereinabove described, the jet propulsion boat 100 is provided with the three-way valve 34 provided in the jet path A and the controller 40 and the thruster CU 41d both configured to control the three-way valve 34 to supply the jet of water from the propulsion device 30 to at least one of the discharge port 31a and the discharge port 36a. Thus, the controller 40 and the thruster CU 41d are properly controlled such that the jet of water from the propulsion device 30 is properly supplied to at least one of the discharge port 31a and the discharge port 36a, and hence the control for discharging the jet of water is reliably performed. Furthermore, the openable and closable three-way valve 34 and the rotatable rotary discharge portion 35 are used together such that the delay in the steering of the jet propulsion boat 100 corresponding to the boat operation of the user is more significantly reduced or prevented as compared with the case where only the openable and closable three-way valve 34 is used.
According to the first embodiment, as hereinabove described, the rotation drive portion 37b is configured to rotationally drive the rotary discharge portion 35 on the basis of the push direction of the joystick 12c so as to adjust the discharge direction of the discharge port 36a. Thus, pushing operation of the user on the joystick 12c is reflected in the rotational drive of the rotary discharge portion 35, and hence the jet propulsion boat 100 is properly moved in a movement direction intended by the user according to the intuitive boat operation of the user through the joystick 12c.
According to the first embodiment, as hereinabove described, the steering operation mode of accepting operation of the user on the steering is switched to the joystick operation mode of accepting operation of the user on the joystick 12c when the boat speed is not more than the prescribed speed. Thus, the steering operation mode is switched to the joystick operation mode in which fine boat operation of the user is reflected when the boat speed is not more than the prescribed speed and fine steering control is possible, and hence the jet propulsion boat 100 is more properly moved in the movement direction intended by the user according to the boat operation of the user through the joystick 12c.
According to the first embodiment, as hereinabove described, the joystick operation mode is cancelled and is switched to the steering operation mode when the user operates the shift lever 12b. Thus, the user easily switches the joystick operation mode to the steering operation mode in which the shift lever 12b is used without performing an operation to cancel the joystick operation mode separately simply by operating the shift lever 12b.
According to the first embodiment, as hereinabove described, the controller 40 and the thruster CU 41d are configured to control the three-way valve 34 to supply the jet of water to the injection nozzle 31 and supply the jet of water to the rotary discharge portion 35 through the jet path A (branched path 33) in the joystick operation mode. Thus, the jet of water is supplied to both the injection nozzle 31 and the rotary discharge portion 35 by the controller 40 and the thruster CU 41d in the joystick operation mode, and hence fine steering corresponding to the movement of the jet propulsion boat 100 in the right-left direction or the like is properly performed by both the injection nozzle 31 and the rotary discharge portion 35.
According to the first embodiment, as hereinabove described, the controller 40 and the thruster CU 41d are configured to control the three-way valve 34 to make the amount of the jet of water supplied to the injection nozzle 31 and the amount of the jet of water supplied to the rotary discharge portion 35 substantially equal to each other and hold the boat body 1 at a fixed point by making the discharge direction of the discharge port 31a and the discharge direction of the discharge port 36a opposite to each other, when the joystick 12c is not operated in the joystick operation mode. Thus, the boat body 1 is reliably held at a fixed point in a state where the joystick 12c is not operated.
According to the first embodiment, as hereinabove described, the jet propulsion boat 100 is provided with the mode switching button 12d configured to enable the user to switch the steering operation mode of accepting operation of the user on the steering 12a to the joystick operation mode of accepting operation of the user on the joystick 12c. Thus, the user easily switches the steering operation mode to the joystick operation mode by pressing down the mode switching button 12d.
A jet propulsion boat 200 according to a second embodiment of the present invention is now described with reference to
(Structure of Jet Propulsion Boat)
The jet propulsion boat 200 includes two engines 102 and 202 stored in a hull 10 of a boat body 1 and two jet propulsion units 103 and 203 connected to the engines 102 and 202, as shown in
The engine 102 and the jet propulsion unit 103 are arranged along arrow R relative to a centerline C, and the engine 202 and the jet propulsion unit 203 are arranged along arrow L relative to the centerline C. The drive force of the engines 102 and 202 is transmitted to the jet propulsion units 103 and 203 through drive shafts 102a and 202a etc., respectively.
<Structure of Jet Propulsion Unit>
The jet propulsion units 103 and 203 are symmetric about the centerline C, as shown in
In the jet propulsion unit 103 along arrow R, a jet path A1 (see
The branched path 133 connects the propulsion device 130 and a rotary discharge portion 35 (see
One rotary discharge portion 35 is provided on the centerline C of the boat body 1 in a forward direction, similarly to the aforementioned first embodiment, as shown in
As shown in
<Structure of Control System>
The jet propulsion boat 200 includes a controller 140, an ECU 141a, a shift CU 41b, a steering CU 141c, and a thruster CU 141d as a control system, as shown in
The controller 140 totally controls the jet propulsion boat 200. The ECU 141a controls the drive of the engines 102 and 202 according to the amount of push of a shift lever 12b or a joystick 12c on the basis of an instruction from the controller 140. The steering CU 141c controls the rotation of the injection nozzles 131 and 231 and the rotation of the buckets 132 and 232 according to the rotation angle of the steering 12a or the push direction of the joystick 12c on the basis of an instruction from the controller 140. The thruster CU 141d controls the switching of the three-way valves 134 and 234 and the rotation of the rotary discharge portion 35 according to the rotation angle of the steering 12a or the push direction of the joystick 12c on the basis of an instruction from the controller 140. The remaining structure of the jet propulsion boat 200 according to the second embodiment is similar to that of the jet propulsion boat 100 according to the aforementioned first embodiment.
<Steering Control in Steering Operation Mode>
Steering control performed by the controller 140 in a steering operation mode is now described with reference to
In the steering operation mode, the jets of water are discharged by prescribed amounts in prescribed directions from two of a discharge port 36a of the rotary discharge portion 35, a discharge port 131a of the injection nozzle 131, and a discharge port 231a of the injection nozzle 231, as shown in
Specifically, directions shown by a dotted arrow and a solid arrow in
When the jet propulsion boat 200 is moved diagonally backward right, the three-way valves 134 and 234 are controlled such that the jet of water is not supplied to the injection nozzle 131 along arrow R but is supplied only to the injection nozzle 231 along arrow L. Thus, the jet of water from the propulsion device 130 along arrow R is supplied to the rotary discharge portion 35. Steering control is performed such that the discharge direction BD of the discharge port 231a of the injection nozzle 231 along arrow L is diagonally forward left and the discharge direction FD of the discharge port 36a of the rotary discharge portion 35 is diagonally forward left.
When the jet propulsion boat 200 is moved right, the three-way valves 134 and 234 are controlled such that the jet of water is not supplied to the injection nozzle 231 along arrow L but is supplied only to the injection nozzle 131 along arrow R. Thus, the jet of water from the propulsion device 230 along arrow L is supplied to the rotary discharge portion 35. Steering control is performed such that the discharge direction BD of the discharge port 131a of the injection nozzle 131 along arrow R is diagonally backward left and the discharge direction FD of the discharge port 36a of the rotary discharge portion 35 is diagonally forward left. At this time, propulsion force in a forward direction and propulsion force in a backward direction cancel each other out in the injection nozzle 131 along arrow R and the rotary discharge portion 35 such that the jet propulsion boat 200 is moved right.
<Steering Control in Joystick Operation Mode>
Steering control performed by the controller 140 in a joystick operation mode is now described with reference to
In the joystick operation mode, the jets of water are discharged by prescribed amounts in prescribed directions from two of the discharge port 36a of the rotary discharge portion 35, the discharge port 131a of the injection nozzle 131, and the discharge port 231a of the injection nozzle 231, similarly to the steering operation mode. At this time, the discharge direction and the discharge amount of each of the discharge port 36a of the rotary discharge portion 35, the discharge port 131a of the injection nozzle 131, and the discharge port 231a of the injection nozzle 231 are determined by the controller 140 (see
When the user rotationally moves the joystick 12c while pushing the same, steering control is performed such that the jet propulsion boat 200 is rotated, as shown in
When the jet propulsion boat 200 is rotated counterclockwise, on the other hand, the three-way valves 134 and 234 are controlled such that the jet of water is not supplied to the injection nozzle 131 along arrow R but is supplied only to the injection nozzle 231 along arrow L. Thus, the jet of water from the propulsion device 130 along arrow R is supplied to the rotary discharge portion 35. Steering control is performed such that the discharge direction BD of the discharge port 231a of the injection nozzle 231 along arrow L is diagonally forward left and the discharge direction FD of the discharge port 36a of the rotary discharge portion 35 is diagonally backward right. Thus, the jet propulsion boat 200 is rotated counterclockwise about the center of gravity G.
(Effects of Second Embodiment)
According to the second embodiment, the following effects are obtained.
According to the second embodiment, as hereinabove described, the rotary discharge portion 35 is configured to be rotatable so as to change the discharge direction of the discharge port 36a. Thus, delay in the steering of the jet propulsion boat 200 corresponding to the boat operation of the user is significantly reduced or prevented, similarly to the aforementioned first embodiment.
According to the second embodiment, as hereinabove described, the controller 140 and the thruster CU 141d are configured to control the three-way valves 134 and 234 to supply the jet of water from one of the propulsion devices 130 and 230 to one rotary discharge portion 35. Thus, it is not necessary to control the three-way valves 134 and 234 to distribute the jets of water from the propulsion devices 130 and 230 to a plurality of rotary discharge portions, and hence complication of control for discharging the jets of water is effectively significantly reduced or prevented. Furthermore, both the propulsion devices 130 and 230 are configured to be capable of supplying the jets of water to the rotary discharge portion 35, whereby the possibility that no jet of water is unintentionally supplied to the rotary discharge portion 35 due to mechanical failure or the like is significantly reduced or prevented, as compared with the case where only one of the propulsion devices 130 and 230 is connected to the rotary discharge portion 35 so as to supply the jet of water to the rotary discharge portion 35.
According to the second embodiment, as hereinabove described, the controller 140 and the thruster CU 141d are configured to control the three-way valves 134 and 234 to selectively supply the jets of water to two of the rotary discharge portion 35, the injection nozzle 131, and the injection nozzle 231. Thus, the controller 140 and the thruster CU 141d control the three-way valves 134 and 234 to properly supply the jets of water to two of the rotary discharge portion 35, the injection nozzle 131, and the injection nozzle 231, whereby the control for discharging the jets of water is more reliably performed.
According to the second embodiment, as hereinabove described, the controller 140 and the thruster CU 141d are configured to control the three-way valve 134 to supply the jet of water from the propulsion device 130 to the injection nozzle 131 and control the three-way valve 234 to supply the jet of water from the propulsion device 230 to the injection nozzle 231, when the boat body 1 is moved forward or backward. Thus, the boat body 1 is propelled by the jets of water discharged from the discharge port 131a and the discharge port 231a in the case of forward movement or backward movement not requiring fine steering control, and hence it is not necessary to rotationally control the rotary discharge portion 35. Therefore, control of the jet propulsion boat 200 during forward movement or backward movement is simplified. The remaining effects of the second embodiment are similar to those of the aforementioned first embodiment.
The embodiments disclosed this time must be considered as illustrative in all points and not restrictive. The range of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and all modifications within the meaning and range equivalent to the scope of claims for patent are further included.
For example, while the tube member 36 of the rotary discharge portion 35 that is rotatable 360 degrees in the horizontal plane is rotated by the arbitrary angle in the horizontal plane such that the jet of water is discharged in any direction of 360 degrees in the horizontal plane from the discharge port 36a of the rotary discharge portion 35 in the aforementioned first embodiment, the present invention is not restricted to this. According to the present invention, the tube member of the rotary discharge portion may alternatively be rotatable less than 360 degrees in the horizontal plane. In this case, a plurality of discharge ports and a switching portion that switches a discharge port from which a jet of water is discharged are preferably provided in the tube member such that the jet of water is discharged in any direction of 360 degrees in the horizontal plane from the discharge port. For example, the tube member of the rotary discharge portion is configured to be rotatable 180 degrees in the horizontal plane, and two discharge ports are provided at an angular interval of 180 degrees in the tube member while the switching portion that switches the two discharge ports is provided in the tube member. The rotation of the tube member and the switching of the switching portion are controlled such that the jet of water is discharged in any direction of 360 degrees in the horizontal plane.
While the storing portion 10a that stores the rotary discharge portion 35 is provided in the aforementioned first embodiment, the present invention is not restricted to this. According to the present invention, no storing portion may be provided. Furthermore, a mechanism configured to move the rotary discharge portion downward to the outside of the storing portion when the rotary discharge portion is not stored in the storing portion and to move the rotary discharge portion upward to the inside of the storing portion when the rotary discharge portion is stored in the storing portion may be provided in the boat body.
While the three-way valve 134 is switched such that the jet of water is supplied to either the injection nozzle 131 or the branched path 133 and the three-way valve 234 is switched such that the jet of water is supplied to either the injection nozzle 231 or the branched path 233 in the aforementioned second embodiment, the present invention is not restricted to this. According to the present invention, the three-way valve 134 may alternatively be configured to supply (distribute) the jet of water to both the injection nozzle 131 and the branched path 133, and/or the three-way valve 234 may alternatively be configured to supply (distribute) the jet of water to both the injection nozzle 231 and the branched path 233, similarly to the three-way valve 34 according to the aforementioned first embodiment.
While the three-way valve 134 along arrow R is configured to supply the jet of water generated in the propulsion device 130 to the injection nozzle 131 or the rotary discharge portion 35 through the branched path 133 and the three-way valve 234 along arrow L is configured to supply the jet of water generated in the propulsion device 230 to the injection nozzle 231 or the rotary discharge portion 35 through the branched path 233 in the aforementioned second embodiment, the present invention is not restricted to this. According to the present invention, the branched paths may alternatively be configured such that the jet of water generated in the propulsion device along arrow R is supplied to the injection nozzle along arrow L and/or the jet of water generated in the propulsion device along arrow L is supplied to the injection nozzle along arrow R.
While the jet of water is discharged only from the injection nozzle 31 when the jet propulsion boat 100 is moved forward in the aforementioned first embodiment and the jets of water are discharged only from the injection nozzles 131 and 231 when the jet propulsion boat 200 is moved forward or backward in the aforementioned second embodiment, the present invention is not restricted to this. According to the present invention, the jet of water(s) may alternatively be discharged from not only the injection nozzle(s) but also the rotary discharge portion even when the jet propulsion boat is moved forward or backward. In this case, the discharge direction of the discharge port of the rotary discharge portion is backward when the jet propulsion boat is moved forward, and the discharge direction of the discharge port of the rotary discharge portion is forward when the jet propulsion boat is moved backward.
While the three-way valve(s) 34 (134, 234) is used as the “jet control valve” according to the present invention in each of the aforementioned first and second embodiments, the present invention is not restricted to this. According to the present invention, a valve(s) other than the three-way valve(s) may alternatively be used as the “jet control valve” according to the present invention. For example, instead of the three-way valve, two common sluice valves may alternatively be provided in the jet path such that the jet of water is supplied to at least one of the branched path (rotary discharge portion) and the injection nozzle.
While one rotary discharge portion 35 is provided in each of the aforementioned first and second embodiments, the present invention is not restricted to this. According to the present invention, a plurality of rotary discharge portions (second discharge portions) may alternatively be provided. When two propulsion devices are provided as in the second embodiment, a rotary discharge portion is preferably provided for each of the two propulsion devices. Furthermore, jets of water are controlled, and hence the plurality of rotary discharge portions are preferably arranged at positions that are symmetric about the centerline in a front portion of the boat body.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2015-106582 | May 2015 | JP | national |
| Number | Name | Date | Kind |
|---|---|---|---|
| 3675611 | Glass | Jul 1972 | A |
| 8490558 | Foley et al. | Jul 2013 | B2 |
| Number | Date | Country |
|---|---|---|
| 1194510 | Jun 1970 | GB |
| 2001-328593 | Nov 2001 | JP |
| Number | Date | Country | |
|---|---|---|---|
| 20160347433 A1 | Dec 2016 | US |
