JP2008201414A - Small boat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce operating load to a nozzle deflector and a reverse bucket. <P>SOLUTION: The reverse bucket 50 is supported on a bracket 51 fixed to a propulsion duct 12 so as to be vertically oscillated, and the attachment section of the bracket 51 to the propulsion duct 12 is provided in front of the nozzle deflector 13. Moreover, the axis of the oscillating axis of the reverse bucket 50 is arranged in the bracket 51 so that it is overlapped with the nozzle deflector 13 in side view. In plane view, the reverse bucket 50 has a shade section bent to be located forward toward the outside in the width direction of the boat body, and a reversing section is formed inside the shade section in a size for covering the opening of the nozzle deflector 13 in a state of being oscillated from side to side. A water outlet for forwardly spouting a jet flow spouted rearward from the nozzle deflector 13 and flowing outwards along the reversing section in the boat width direction is provided in the outside section of the shade section in the boat width direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a small vessel provided with a reverse bucket that covers an opening of a nozzle deflector during reverse travel.

  For example, a small vessel is equipped with a jet propulsion device that ejects water sucked from the bottom of the ship by the rotation of an impeller through a propulsion duct, and supports a nozzle deflector that can swing around a vertical axis. There is a type provided with a reverse bucket that can swing up and down between a reverse position that covers the opening of the nozzle deflector and a forward position that opens the opening toward the rear.

  Conventionally, since such a reverse bucket is pivotally supported by the nozzle deflector, there is a possibility that the operation load of the nozzle deflector becomes heavy when an attempt is made to enlarge the reverse bucket. For this reason, it is conceivable that the reverse bucket is supported by the propulsion duct. In this case, since the reverse bucket needs to be extended forward of the nozzle deflector, the reverse bucket is enlarged and its operation load becomes heavy. There is a fear.

  This invention is made in view of this point, and it aims at providing the small ship which can make the operation load of a nozzle deflector and a reverse bucket light.

  In order to solve the above-described problems and achieve the object, the present invention is configured as follows.

The invention described in claim 1
“A jet propulsion unit that jets water sucked from the bottom of the ship by the rotation of the impeller back through the propulsion duct. The propulsion duct supports a nozzle deflector that can swing around the vertical axis, and the nozzle deflector opening. In a small vessel provided with a reverse bucket that can swing up and down between a reverse position that covers the part and a forward position that opens the opening toward the rear,
The reverse bucket is pivotally supported on a bracket attached to the propulsion duct so as to be swingable in the vertical direction,
A mounting portion of the bracket to the propulsion duct is provided in front of the nozzle deflector, and an axis of the swing shaft of the reverse bucket is provided in the bracket so as to overlap the nozzle deflector in a side view.
The reverse bucket has a cap portion that is curved so as to be positioned forward as it goes outward in the width direction of the hull in plan view.
Formed to cover the opening of the nozzle deflector in a state where the reversing part is swung from side to side on the inner surface of the cap part, and is ejected rearward from the nozzle deflector, and the hull width along the reversing part A small vessel characterized in that a water outlet for ejecting a jet flowing outward in the direction toward the front is provided on the outer side in the hull width direction of the cap. ].

The invention according to claim 2
“A jet propulsion unit that jets water sucked from the bottom of the ship by the rotation of the impeller back through the propulsion duct. The propulsion duct supports a nozzle deflector that can swing around the vertical axis, and the nozzle deflector opening. In a small vessel provided with a reverse bucket that can swing up and down between a reverse position that covers the part and a forward position that opens the opening toward the rear,
The reverse bucket is pivotally supported on a bracket attached to the propulsion duct so as to be swingable in the vertical direction,
The reverse bucket has a cap portion that is curved so as to be positioned forward as it goes outward in the width direction of the hull in plan view.
The reverse portion is formed on the inner surface of the cap portion so as to cover the opening of the nozzle deflector in a state where the reversing portion is swung from side to side, and the reverse bucket includes an arm portion attached to the bracket and a flat surface. In view, a water outlet that is ejected rearward from the nozzle deflector and jets forward toward the front in the width direction of the hull along the reversing part is formed in a bilaterally symmetrical manner with respect to the lateral side of the arm part. A small vessel provided on the outer side of the cap portion in the width direction of the hull. ].

With the above configuration, the present invention has the following effects.
According to the first aspect of the present invention, the mounting portion of the bracket on the propulsion nozzle is provided in front of the nozzle deflector, and the axis of the swing shaft of the reverse bucket is attached to the bracket so as to overlap the nozzle deflector in a side view. Since it provided, the reverse bucket can be reduced in size and the operation load of the reverse bucket can be further reduced. Since the jet flow ejected forward from the reverse portion of the reverse bucket flows forward during reverse travel, the reverse travel can be performed smoothly.

According to the second aspect of the present invention, the jet flow ejected rearward from the nozzle deflector flows outward in the width direction of the hull along the inversion portion, and the jet flow is ejected forward from the water outlet. The water outlet is located on the outer side in the hull width direction of the symmetrical left and right side of the cap portion. During reverse travel, the jet flow ejected forward from the reverse portion of the reverse bucket flows forward without being disturbed by the bracket, and therefore the reverse travel can be performed smoothly.

  Hereinafter, embodiments of the small vessel of the present invention will be described. First, a small vessel to which the present invention is applied will be described with reference to FIGS. FIG. 1 is a side view of a small vessel, and FIG. 2 is a plan view of the small vessel.

  The embodiment is applied to the water jet propulsion boat 1 as a small vessel, and the water jet propulsion boat 1 ejects water sucked from the bottom of the vessel backward. The hull 2 of the water jet propulsion boat 1 has a bathtub-shaped hull 3 and a lid-shaped deck 4 joined in a watertight manner with a gunnel 5 to form footrests 4a, 4b extending in the front-rear direction of the hull on the left and right side edges of the deck 4. Of the structure. A straddle-type seat 6 on which a plurality of passengers can be seated is detachably disposed on the upper surface of the deck 4. A steering handle 7 is disposed in front of the straddle-type seat 6 so as to be steerable left and right, and a hatch cover 8 is disposed in front of the steering handle 7 of the deck 4 so as to be openable and closable.

  A fuel tank 10 and an engine 9 are mounted on the hull 2. In this embodiment, the engine 9 is disposed below the straddle-type seat 6 in the hull 2. A fuel tank 10 is disposed. A front case case 150 and a rear case case 130 are bonded to the deck 4. The rear container 130 extends from the rear of both sides of the hull to the center of the vehicle body along the lower part of the footrests 4a and 4b, and is sized to accommodate, for example, a water ski. An openable / closable lid 131 is provided at the opening of the rear container 130.

  A bulkhead 140 is bonded to the rear position of the engine 9. The bulkhead 140 partitions the ship space into a front chamber A and a rear chamber B, and reinforces the hull 2. In the rear chamber B, a jet propulsion device 11 is disposed. The jet propulsion device 11 has a propulsion duct 12, and a nozzle deflector 13 that adjusts the traveling direction of the ship is mounted behind the propulsion duct 12.

  An impeller 14 is disposed in the middle of the propulsion duct 12, and a front end of an impeller shaft (propulsion shaft) 15 that rotates the impeller 14 is connected to a rear end of a crankshaft 16 of the engine 9 via a coupling 17 as a power transmission member. It is connected. The impeller shaft 15 is supported by the bulkhead 140 via a bearing 141.

  An intake duct 20 is disposed in the hull 2. The intake duct 20 introduces air outside the ship into the ship. The air introduction port 20 a of the intake duct 20 is opened in front of the steering handle 7, and the inboard lower end opening 20 b that is a discharge port is formed in front of the engine 9. Open at the bottom. In addition, an inboard lower end opening 800 b that is a discharge port of the intake duct 800 is opened at the lower rear portion of the engine 9, and the introduction port 800 a of the intake duct 800 is opened below the straddle-type seat 6.

  The engine 9 is a water-cooled two-cycle parallel two-cylinder engine, and an exhaust manifold 36 is connected to the engine 9. An exhaust expansion pipe 37, a water lock 38, and a rear exhaust pipe 39 are sequentially connected to the downstream side of the exhaust manifold 36, and exhaust gas from each cylinder is discharged into the water at the rear of the hull. The exhaust manifold 36 is connected to the exhaust port 26b. The rear exhaust pipe 39 straddles the jet propulsion unit 11 and extends to the opposite side with respect to the water lock 38, and is further bent and extends to the rear part of the hull.

  The water jet propulsion boat 1 is provided with a nozzle deflector 13 that adjusts traveling behind the propulsion duct 12, and further includes a reverse bucket 50 that covers the opening of the nozzle deflector 13 during reverse travel.

  3 to 7 show the position of the reverse bucket 50 at the time of forward movement, FIG. 3 is a side view, FIG. 4 is a plan view, FIG. 5 is a rear view, FIG. 6 is an enlarged side view of the lock mechanism, and FIG. It is sectional drawing which follows the VII-VII line. 8 to 13 show the position of the reverse bucket 50 during reverse travel. FIG. 8 is a side view, FIG. 9 is a plan view, FIG. 10 is a rear view, FIG. 11 is an enlarged side view of the lock mechanism, and FIG. FIG. 13 is a cross-sectional view taken along line XII-XII, and FIG. 13 is a view showing the vertical swing of the nozzle deflector.

  A pair of left and right brackets 51 are fixed to the rear end portion of the propulsion duct 12 by three fastening bolts 52 from both sides. As described above, the bracket 51 is divided into left and right parts, and is easily assembled by fastening means by fastening bolts 52 from both sides of the rear end portion of the propulsion duct 12. A bilge discharge hose 110 is communicated with the rear end of the propulsion duct 12.

  A support cylinder 53 is provided at the rear end of the propulsion duct 12 so as to be swingable about a horizontal shaft 54, and the nozzle deflector 13 is attached to the support cylinder 53 via a vertical shaft 55 so as to be swingable in the left-right direction. It has been. The nozzle deflector 13 is formed in a cylindrical shape that narrows as it extends rearward, and a flange portion 13b is formed in the opening on the front side. The flange portion 13b is externally fitted to the support cylinder 53 and the vertical shaft 55 is screwed to the nozzle deflector. The deflector 13 is supported so as to be swingable about the vertical axis 53.

  A connecting portion 100 is provided on the side of the nozzle deflector 13, and the operation of the operation cable 101 connected to the connecting portion 100 causes the nozzle deflector 13 to swing left and right about the vertical shaft 55 as a fulcrum, thereby changing the traveling direction of the ship. Can be adjusted.

  Further, a connecting portion 57 is provided on the upper portion of the nozzle deflector 13, and the nozzle deflector 13 swings up and down around the horizontal shaft 54 as a result of an operation of an operation cable 58 connected to the connecting portion 57. FIG. 13 shows a trim operation in which the nozzle deflector 13 swings up and down with the horizontal shaft 54 as a fulcrum. 13A shows a trim-up state, FIG. 13B shows a trim-neutral state, and FIG. 13C shows a trim-down state. Thus, trim adjustment of the nozzle deflector 13 is performed.

  A pair of left and right brackets 51 is provided with an arm portion 50a of a reverse bucket 50 so as to be rotatable about a support pin 60, and a reinforcing rib 50f extending in the width direction of the hull is integrally formed on the outer surface portion of the reverse bucket 50. Is formed. Since the reverse bucket 50 is pivotally supported on the bracket 51 fixed to the propulsion duct 12 in such a manner as to be swingable in the vertical direction, the reverse bucket 50 can be attached to the propulsion duct 12 without increasing the size. Of course, the operation load of the reverse bucket 50 can be reduced as well as the nozzle deflector 13.

  Further, since the bracket 51 for pivotally supporting the reverse bucket 50 is divided into left and right, the bracket 51 can be reduced in size, and the bracket 51 is attached to the propulsion duct 12 from the side of the propulsion duct 12 by fastening means. Since it attached, the reverse bucket 50 and the bracket 51 can be assembled | attached easily from a side.

  Further, the bracket 51 is formed in a substantially U-shaped cross section so as to open toward the propulsion duct 12 as shown in FIG. The operation cable 101 for swinging the nozzle deflector 13 to the left and right is guided forward through a space K1 surrounded by the bracket 51 and the propulsion duct 12, and the operation cable 101 for swinging the nozzle deflector 13 to the left and right. Since it is surrounded by the right bracket 51 and the propulsion duct 12 and is protected by these, the durability is improved. Similarly, the bilge discharge hose 110 is guided rearwardly through a space K2 surrounded by the left bracket 51 and the propulsion duct 12, and the bilge discharge hose 110 is surrounded by the left bracket 51 and the propulsion duct 12. Therefore, the durability is improved because they are protected by these.

  On the left and right side walls of the reverse bucket 50, water outlets 50n are formed that open toward the front during reverse travel in order to eject the water flow forward during reverse travel. A plurality of ribs 50 d extending in the width direction of the hull are formed inside the shade portion 50 c of the reverse bucket 50, and the reverse bucket 50 covers the opening 13 a of the nozzle deflector 13 and the rib 50 d is inclined with respect to the horizontal plane L during reverse travel. The angle θ1 is set to be larger than the inclination angle θ2 with respect to the horizontal plane L of the axial center of the nozzle deflector 13 when the nozzle deflector 13 is trimmed down as shown in FIG. Therefore, when the water flow jetted from the opening 13a of the nozzle deflector 13 during reverse travel is guided to the rib 50d inside the shade 50c and flows sideways while being reversed forward by the shade 50c as shown in FIG. Since the rib 50d is pushed down, the reverse bucket 50 can be prevented from jumping up.

  Of course, in the trim-up state shown in FIG. 13A and the trim-neutral state shown in FIG. 13B, the water flow jetted from the opening 13 of the nozzle deflector 13 during reverse travel similarly pushes down the rib 50d downward. The bucket 50 can be prevented from jumping up. The water flow guided to the side by the rib 50d is jetted forward from the water outlet 50n opened on the left and right side walls of the reverse bucket 50. By the reaction force, the water jet propulsion boat 1 moves backward.

  An attachment portion 50e is formed on the upper side of the reverse bucket 50, and a lock mechanism 70 is provided on the attachment portion 50e. The lock mechanism 70 includes a first arm member 71, a stopper plate 74, and a second arm member 77. The first arm member 71 is pivotally supported by the mounting portion 50e so as to be rotatable about the support bolt 72, and the first arm member 71 is a latching claw portion that is bent in an L shape inward at one end portion. 71a, a cable attachment portion 71b is provided at the other end, and a collar 71c is provided. The collar 71c is formed so as to be rotatable around the axis of the cable attachment portion 71b. One end of an operation cable 73 for forward / reverse switching is connected to the cable attachment portion 71b. The other end of the operation cable 73 is connected to a forward / reverse switching lever provided near the steering handle 7.

  A stopper plate 74 is attached to the attachment portion 50e by a pair of support bolts 75 and 76, and the stopper plate 74 is formed with stopper portions 74a and 74b by bending the ends outward in an L shape. A second arm member 77 is rotatably provided on the support bolt 75. The second arm member 77 is formed with a movement restricting window 77a, and a support bolt 76 is located in the movement restricting window 77a. The second arm member 77 has a claw portion 77b bent in an L shape inside.

  During reverse travel, as shown in FIGS. 8, 11, and 12, the reverse bucket 50 has a locking portion 50 b formed at the distal end portion of the arm portion 50 a and a boss portion 51 a formed on the bracket 51 from below. The cap 50c of the reverse bucket 50 is held in contact with the opening 13a of the nozzle deflector 13. The claw portion 77 b of the second arm member 77 is engaged with a bounce prevention stopper 51 b formed integrally with the bracket 51 to restrict the bounce of the reverse bucket 50.

  A coil spring 78 is wound around the support bolt 72, one end portion 78 a is locked to the cable attachment portion 71 b, and the other end portion 78 b is locked to the support bolt 76. The first arm member 71 is urged by the coil spring 78 so as to always rotate counterclockwise around the support bolt 72, that is, to contact the upper stopper portion 74 a of the stopper plate 74. A coil spring 79 is wound around the support bolt 75, one end 79 a is locked to the end 77 c of the second arm member 77, and the other end 79 b is locked to the support bolt 76. The second arm member 77 is urged by the coil spring 79 so as to always rotate counterclockwise around the support bolt 75, that is, the claw portion 77b abuts against the spring-up preventing stopper 51b when moving backward. . The amount of rotation of the second arm member 77 around the support bolt 75 in the counterclockwise direction is restricted by the support bolt 76 coming into contact with the inner wall of the movement restricting window 77a.

  At the time of advance, the reverse bucket 50 is in an upper position where the opening 13a of the nozzle deflector 13 is opened as shown in FIGS. 3 and 6 to 7, and the locking claw 71 a of the first arm member 71 is the bracket 51. The reverse bucket 50 is prevented from falling by being locked to the stopper portion 80b of the bucket drop prevention stopper 80.

  The bucket drop prevention stopper 80 is rotatably supported by a support bolt 81 screwed to the bracket 51. A coil spring 82 is wound around the shaft portion 80 a of the bucket drop prevention stopper 80, one end 82 a is locked to the bucket drop prevention stopper 80, and the other end 82 b is fixed to a lock pin 83 fixed to the bracket 51. It is locked. The coil spring 82 urges the bucket drop prevention stopper 80 to rotate clockwise around the support bolt 81, that is, so that the recess 80 c of the bucket drop prevention stopper 80 always abuts against the locking pin 83. Yes.

  At the time of forward movement, the reverse bucket 50 is at an upper position where the opening 13a of the nozzle deflector 13 is opened as shown in FIGS. 3 and 6 to 7, and in order to change from the locked state to the backward state, the forward / reverse switching lever Is operated and the operation cable 73 is pushed. Then, the first arm member 71 rotates clockwise around the support bolt 72 in FIG. 3 so that the locking claw portion 71a is disengaged from the stopper portion 80b of the bucket drop prevention stopper 80, and the first arm The member 71 contacts the lower stopper portion 74b. When the operation cable 73 is further pressed, the reverse bucket 50 rotates clockwise about the support pin 60 via the first arm member 71, and the locking portion 50b of the reverse bucket 50 contacts the boss portion 51a. The rotation is restricted in contact with each other, and the shade portion 50c is in the reverse movement state covering the opening portion 13a of the nozzle deflector 13 as shown in FIGS.

  Thus, at the position where the reverse bucket 50 during reverse travel covers the opening 13a of the nozzle deflector 13, the reverse bucket 50 is rotated counterclockwise in FIG. 8, FIG. 11 and FIG. Although it is going up, the claw portion 77b of the second arm member 77 is locked by the jumping prevention stopper 51b, and the jumping of the reverse bucket 50 is restricted.

  In order to change from the locked state during reverse travel to the forward travel state, the operation cable 73 may be pulled by operating the forward / reverse switching lever. Then, at the same time as the first arm member 71 rotates in the clockwise direction, the collar 71c comes into contact with the end 77c of the second arm member 77 so that the second arm member 77 is rotated around the support bolt 75 in the clockwise direction. That is, it pushes in the unlocking direction. For this reason, the claw portion 77b of the second arm member 77 is released from the jumping prevention stopper 51b of the bracket 51 and unlocked, and the reverse bucket 50 can be rotated counterclockwise around the support pin 60. Further, when the operation cable 73 is pulled, the first arm member 71 rotates and abuts against the lower stopper portion 74 b of the stopper plate 74 to restrict the rotation, so that the reverse bucket 50 is opposed to the support pin 60. Rotating clockwise and lifting upward, the locking claw portion 71a of the first arm member 71 contacts the stopper portion 80b of the bucket drop prevention stopper 80 as shown in FIGS. As a result, the bucket drop prevention stopper 80 rotates counterclockwise around the support bolt 81 against the spring 82 and escapes, whereby the locking claw portion 71a and the stopper portion 80b are brought into close contact with each other to be in a locked state. Thereafter, the bucket drop prevention stopper 80 is held in a state in which the concave portion 80 c abuts against the locking pin 83 by the biasing force of the coil spring 82. In this locked state, even if the reverse bucket 50 attempts to rotate in the clockwise direction, the locking claw portion 71a of the first arm member 71 is locked to the stopper portion 80b of the bucket drop prevention stopper 80, and rotates in the clockwise direction. Is regulated, the fall of the reverse bucket 50 can be regulated.

  Thus, during reverse travel, the locking mechanism 70 of the reverse bucket 50 engages the claw portion 77b of the second arm member 77 with the bounce prevention stopper 51b provided on the bracket 51 to restrict the bounce of the reverse bucket 50. Since the locking claw portion 71a of the first arm member 71 of the lock mechanism 70 is locked to the stopper portion 80b of the bucket drop prevention stopper 80 provided in the bracket 51 during forward movement, the fall of the reverse bucket 50 is restricted, so The bracket 51 of the duct 13 only needs to be provided with a splash prevention stopper 51b and a bucket drop prevention stopper 80. With a simple structure, the position where the reverse bucket 50 covers the opening 13a of the nozzle deflector 13 and the opening 13a are opened. Can be fixed in the upper position, has few parts, and is placed Ensure the pace is easy.

  In the above embodiment, the reverse bucket 50 is indirectly supported by the propulsion duct 12 via the bracket 51, and the splash prevention stopper 51b and the bucket drop prevention stopper 80 are provided on the bracket 51. The reverse bucket 50 may be directly supported on the propulsion duct 12 without being interposed, and the splash prevention stopper 51b and the bucket drop prevention stopper 80 may be provided on the propulsion duct.

  Further, the bracket 51 provided in the propulsion duct 12 is provided with the jump prevention stopper 51b and the bucket drop prevention stopper 80, and the lock mechanism 70 is provided on the reverse bucket 50. Thus, the weight of the reverse bucket 50 is of course included in the nozzle deflector 13. The weight of the lock mechanism 70, the splash prevention stopper 51b, and the bucket drop prevention stopper 80 is not added, and the reverse bucket 50 jumps in the reverse position and the reverse bucket 50 in the forward position while maintaining a light operation load on the nozzle deflector 13. Can be reliably prevented.

  In addition, while the nozzle deflector 13 is configured so that trim adjustment is possible, a plurality of ribs 50d extending in the width direction of the hull are formed in the reverse bucket 50, and the rib 50 with respect to the horizontal plane L when the reverse bucket 50 is in the reverse drive position. The inclination angle θ1 is set to be larger than the inclination angle θ2 with respect to the horizontal plane L of the axis O of the nozzle deflector 13 when the nozzle deflector 13 is trimmed down (FIG. 13C). Even in the position, the reverse flow of the reverse bucket 50 can be prevented because the water flow ejected rearward from the opening 13a of the nozzle deflector 13 pushes down the rib 50d. That is, the jet flow ejected rearward from the nozzle deflector 13 during reverse travel flows along the reversing portion 50m formed on the inner surface of the cap portion 50c and is ejected forward from the water outlet 50n, but flows along the reversing portion 50m. At this time, the rib 50d is pushed downward. Accordingly, since the reaction force acting on the lock mechanism 70 and the jump-up preventing stopper 51b when traveling backward is small, the structure of the lock mechanism 70 and the jump-up preventing stopper 51b can be simplified.

  In addition, the mounting portion of the bracket 51 to the propulsion nozzle 12 is provided in front of the nozzle deflector 13, and the horizontal shaft 60 that is the swinging shaft of the reverse bucket 50 is attached to the bracket 51 so as to overlap the nozzle deflector 13 in a side view. Since the reverse bucket 50 is provided, the reverse bucket 50 can be reduced in size, and the operation load of the reverse bucket 50 can be further reduced.

  Further, the lock mechanism 70 is constituted by a first arm member 71 and a second arm member 77 attached to the reverse bucket 50 so as to be positioned above the swinging shaft (horizontal shaft 60) of the reverse bucket 50, An operation cable 73 for forward / reverse switching is connected to the first arm member 71 so that the jump-up prevention stopper 51b and the bucket drop prevention stopper 80 can be engaged with the first arm member 71 and the second arm member 77. Since the bucket fall prevention stopper 80 is positioned further forward than the splash-up prevention stopper 51b, the lock mechanism 70 in the forward movement position is in the reverse movement position. It is located in front of the lock mechanism 70. Here, since the bucket fall prevention stopper 80 is positioned in front of the splash prevention stopper 51b and each is separate, the splash rise prevention stopper 51b and the bucket fall prevention stopper 80 can be downsized.

  Next, another embodiment of the lock mechanism of the water jet propulsion boat 1 will be described with reference to FIGS. In this embodiment, the same components as those of the embodiment of FIGS. 1 to 13 are denoted by the same reference numerals and description thereof is omitted. 14 and 15 show the position of the reverse bucket 50 during forward travel, FIG. 14 is a side view of the forward lock position, FIG. 15 is a side view of the forward lock release position, and FIG. 16 shows the position of the reverse bucket 50 during reverse travel. 17 is a side view of the reverse lock position, FIG. 17 is a side view of the reverse lock release position, FIG. 18 is a plan view of the left bracket, and FIG. 19 is a cross-sectional view taken along line XIX-XIX in FIG. 20 is an enlarged view around the reverse bucket as seen from the direction of arrow A in FIG. 19, and FIG. 21 is an enlarged view around the reverse bucket as seen from the direction of arrow B in FIG.

  An insertion hole 810 for the support pin 60 is formed in the reverse bucket 50, and an attachment portion 50e is formed on the upper side of the reverse bucket 50, and a lock mechanism 70 is provided on the attachment portion 50e. The lock mechanism 70 has a first arm member 171 and a second arm member 177. The first arm member 171 is pivotally supported by the mounting portion 50e so as to be rotatable about a support bolt 172. The first arm member 171 includes an engaging claw portion 171a bent in an L-shape and a stopper. Each of which has a portion 171b, 171c and a connecting claw portion 171d, and is further provided with a cable attachment portion 171e, to which the other end of the operation cable 73 is connected. .

  The second arm member 177 is pivotally supported by the mounting portion 50e so as to be rotatable about the support bolt 175, and the second arm member 177 has locking claws 177a bent in an L shape on the inside. It has a stopper portion 177b and a connecting claw portion 177c bent in an L shape on the outside. The connecting claw portion 171d of the first arm member 171 and the connecting claw portion 177c of the second arm member 177 are engaged and connected to each other.

  A collar 176 is provided on the support bolt 175, and a spring 182 is wound around the collar 176. One end 182 a of the spring 182 is in contact with the support bolt 172, the other end is in contact with the locking claw 177 a of the second arm member 177, and the second arm member 177 is centered on the support bolt 175. Thus, the connecting claw portion 177c is always urged in a direction to connect with the connecting claw portion 171d of the first arm member 171.

  During reverse travel, the reverse bucket 50 is positioned to cover the opening 13a of the nozzle deflector 13 as shown in FIG. 16, and the stopper portion 171b of the first arm member 171 contacts the upper surface of the mounting portion 50e of the reverse bucket 50. The first arm member 171 and the second arm member 177 are held at predetermined positions. Then, the stopper portion 177 b of the second arm member 177 is engaged with a splash prevention stopper 190 provided on the bracket 51 to restrict the flip bucket 50 from jumping up. As shown in FIG. 18, the splash prevention stopper 190 includes a support bolt 190a, a collar 190b, and a nut 190c. The stopper portion 177b is engaged with the outer peripheral surface of the collar 190b. The support bolt 190a is fastened and fixed to the bracket 51 by a nut 190c, and the collar 190b is rotatably supported by the support bolt 190a.

  In order to change from the locked state at the time of reverse travel to the forward travel state, as shown in FIG. 17, when the operation cable 73 is pulled, the first arm member 171 rotates about the support bolt 172 in the clockwise direction. Here, since the connecting claw portion 171 d of the first arm member 171 is in contact with the connecting claw portion 177 c of the second arm member 177, the second arm member 177 starts from the collar 190 b around the support bolt 175. It turns in the direction to leave, that is, the unlocking direction. As described above, the stopper portion 177b of the second arm member 177 does not come into contact with the splash prevention stopper 190, and the stopper portion 171c of the first arm member 171 engages with the upper end portion of the mounting portion 50e. Since the rotation of the first arm member 171 around the support bolt 172 is restricted, the reverse bucket 50 can rotate counterclockwise around the support pin 60. Since the collar 190b is rotatable around the support bolt 190a, the collar 190b rotates when the stopper portion 177b moves away from the collar 190b, so that the stopper portion 177b is smoothly detached from the collar 190b. .

  Further, when the operation cable 73 is pulled, the reverse bucket 50 is rotated counterclockwise via the first arm member 171 and lifted upward to move forward, that is, in the first arm member 171 as shown in FIG. The locking claw 171a is brought into contact with and engaged with a pin-shaped bucket drop prevention stopper 180 fixed to the bracket 51. In this locked state, even if the reverse bucket 50 tries to rotate in the clockwise direction, that is, in the falling direction, the locking claw portion 171a of the first arm member 171 is locked by the bucket falling prevention stopper 180 and rotates in the clockwise direction. Is regulated, the fall of the reverse bucket 50 can be regulated.

  At the time of forward movement, the reverse bucket 50 is in an upper position where the opening 13a of the nozzle deflector 13 is opened as shown in FIG. 14, and when the operation cable 73 is pushed, As the arm member 171 rotates clockwise around the support bolt 172 as shown in FIG. 15 and the locking claw portion 171a is disengaged from the bucket drop prevention stopper 180, the reverse bucket 50 is connected to the first arm member 171. The support pin 60 is rotated clockwise about the support pin 60. Then, as shown in FIG. 16, the stopper portion 177 b of the second arm member 177 abuts against the splash prevention stopper 190 and the rotation is restricted, and the shade portion 50 c is in a reverse movement state covering the opening portion 13 a of the nozzle deflector 13. . When the stopper portion 177b contacts the collar 190b, the collar 190b rotates around the support bolt 190a, so that the stopper portion 177b contacts the collar 190b smoothly.

  As described above, the shape of the locking claw portion 171a and the bucket drop prevention stopper 180 is the same even when the first arm member 171 tries to rotate clockwise around the support pin 60 via the reverse bucket 50. Although the claw portion 171a does not come off from the bucket drop prevention stopper 180, when the first arm member 171 tries to rotate clockwise around the support bolt 172, the locking claw portion 171a comes off from the bucket drop prevention stopper 180. Is set to

  As described above, the lock mechanism 70 includes the first arm member 171 and the second arm member 177 attached to the reverse bucket 50 so as to be positioned above the swinging shaft (horizontal shaft 60) of the reverse bucket 50. The first arm member 171 is connected to the operation cable 73 for forward / reverse switching, and the first arm member 171 and the second arm member 177 can be engaged with the splash prevention stopper 190 and the bucket drop prevention stopper 180. In this way, it is composed of a pin-like member protruding from the bracket 51 provided in the propulsion duct 12, and the bucket drop prevention stopper 180 is positioned forward of the jump prevention stopper 190. Is positioned in front of the lock mechanism 70 in the reverse drive position. Here, the bucket fall prevention stopper 180 and the bucket fall prevention stopper 180 can be downsized because the bucket fall prevention stopper 180 and the bucket fall prevention stopper 180 are separated from each other.

  Further, in the first embodiment and the second embodiment, the cap portion 50c of the reverse bucket 50 is curved so as to be positioned forward as it goes outward in plan view, and from the nozzle deflector 13 The jet jetted rearward flows to the outer side along the curved portion 50m in the hull width direction after hitting the reverse bucket 50, and jetted forward from the jet outlet 50n provided in the outer portion. The curved portion 50m is formed to have a size so as to cover the opening 13a of the nozzle deflector 13 in a state where the nozzle deflector 13 is swung left and right. Even in a state where the nozzle deflector 13 is swung left and right, the nozzle deflector 3 The jet flow ejected rearward from the rear side flows into the outer side along the curved portion 50m after hitting the reverse bucket 50, and is ejected forward from the jet port 50n provided in the outer side portion. Accordingly, the reverse performance is improved not only when the vehicle is traveling straight but also when the nozzle deflector 13 is swung left and right. Moreover, the reverse bucket 50 is curved so as to be positioned forward as it goes to the lower end portion in a side view. Here, as in the second embodiment, the jet that hits the reverse bucket 50 without guiding ribs extending in the hull width direction on the inner surface of the reverse bucket 50 is guided downward along the vertical curved portion 50g. When reversed forward, the jet flow is jetted forward from the lower end portion in addition to the jet ports 50n on the left and right side portions, so that the reverse performance is improved.

  In this embodiment, since the reverse bucket 50 is pivotally supported by a pair of left and right brackets 51 fixed to the propulsion duct 12 so as to be swingable in the vertical direction, the reverse bucket 50 is formed in the propulsion duct 12 without increasing the size of the reverse bucket 50. Since it can be attached, the operation load of the reverse bucket 50 as well as the nozzle deflector 13 can be reduced.

  In addition, the bracket for pivotally supporting the reverse bucket 50 is a pair of left and right brackets 51 and is divided into left and right parts, so that the bracket can be reduced in size and the bracket 51 can be tightened from the side of the propulsion duct 12. Thus, the reverse bucket 50 and the bracket 51 can be easily assembled from the side.

  Further, since the operation cable 101 that swings the nozzle deflector 13 to the left and right is surrounded by the bracket 51 and the propulsion duct 12 and is protected by these, the durability is improved.

  Further, since the jet flow ejected forward from the reversing portion of the reverse bucket 50 flows forward without being obstructed by the bracket 51 during reverse travel, the reverse travel can be performed smoothly.

  In addition, since the mounting portion of the bracket 51 to the propulsion nozzle 12 is provided in front of the nozzle deflector 13, the swing shaft of the reverse bucket 50 is provided in the bracket 51 so as to overlap the nozzle deflector 13 in a side view. The minute reverse bucket 50 can be reduced in size, and the operation load of the reverse bucket 50 can be further reduced.

  The present invention can be applied to a small vessel provided with a reverse bucket that covers the opening of the nozzle deflector during reverse travel, and can reduce the operation load of the nozzle deflector and the reverse bucket.

It is a side view of the small vessel of a 1st embodiment. It is a top view of the small vessel of a 1st embodiment. It is a side view which shows the position of the reverse bucket at the time of advance in the small boat of 1st Embodiment. It is a top view which shows the position of the reverse bucket at the time of advance in the small boat of 1st Embodiment. It is a rear view which shows the position of the reverse bucket at the time of advance in the small boat of 1st Embodiment. It is an enlarged side view of a lock mechanism in the small boat of a 1st embodiment. It is sectional drawing which follows the VII-VII line of FIG. It is a side view which shows the position of the reverse bucket at the time of reverse drive in the small ship of 1st Embodiment. It is a top view which shows the position of the reverse bucket at the time of reverse travel in the small ship of 1st Embodiment. It is a rear view which shows the position of the reverse bucket at the time of reverse drive in the small ship of 1st Embodiment. It is an enlarged side view of a lock mechanism in the small boat of a 1st embodiment. It is sectional drawing which follows the XII-XII line | wire of FIG. It is a figure which shows the rocking | fluctuation of a nozzle deflector up and down in the small ship of 1st Embodiment. It is a side view of the forward lock position of a reverse bucket in the small vessel of a 2nd embodiment. It is a side view of a forward lock release position in the small boat of a 2nd embodiment. It is a side view of the reverse lock position in the small boat of 2nd Embodiment. It is a side view of the reverse lock release position in the small boat of 2nd Embodiment. It is a top view of the left bracket in the small boat of a 2nd embodiment. It is sectional drawing which follows the XIX-XIX line | wire of FIG. FIG. 20 is an enlarged view around the reverse bucket as seen from the direction of arrow A in FIG. 19. FIG. 20 is an enlarged view around the reverse bucket as seen from the direction of arrow B in FIG. 19.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Water jet propulsion boat 2 Hull 3 Hull 4 Deck 11 Jet propulsion machine 12 Propulsion duct 13 Nozzle deflector 13a Nozzle deflector 13 opening 14 Impeller 50 Reverse bucket 51b, 190 Bounce prevention stopper 70 Lock mechanism 80, 180 Bucket fall prevention stopper

Claims (2)

A jet propulsion device that jets water sucked from the bottom of the ship by the rotation of the impeller back through the propulsion duct, and supports a nozzle deflector that can swing around a vertical axis. The opening of the nozzle deflector In a small vessel provided with a reverse bucket that can swing up and down between a reverse position that covers and a forward position that opens the opening toward the rear,
The reverse bucket is pivotally supported on a bracket attached to the propulsion duct so as to be swingable in the vertical direction,
A mounting portion of the bracket to the propulsion duct is provided in front of the nozzle deflector, and an axis of the swing shaft of the reverse bucket is provided in the bracket so as to overlap the nozzle deflector in a side view.
The reverse bucket has a shade portion that is curved so as to be positioned forward as it goes outward in the width direction of the hull in plan view,
It is formed in a size so as to cover the opening of the nozzle deflector in a state where the reversing part is swung from side to side on the inner surface of the cap part,
A water outlet is provided at the outer portion of the cap portion in the width direction of the hull, which is jetted rearward from the nozzle deflector and jets the jet flowing forward in the width direction of the hull along the reversing portion. A small ship that features. A jet propulsion device that jets water sucked from the ship bottom by rotation of the impeller back through the propulsion duct, and supports a nozzle deflector that can swing around a vertical axis. The opening of the nozzle deflector In a small vessel provided with a reverse bucket that can swing up and down between a reverse position that covers and a forward position that opens this opening toward the rear,
The reverse bucket is pivotally supported on a bracket attached to the propulsion duct so as to be swingable in the vertical direction,
The reverse bucket has a cap portion that is curved so as to be positioned forward as it goes outward in the width direction of the hull in plan view.
It is formed in a size so as to cover the opening of the nozzle deflector in a state where the reversing part is swung from side to side on the inner surface of the cap part,
The reverse bucket includes an arm portion attached to the bracket, and in a plan view, the reverse bucket is ejected rearward from the nozzle deflector and ejected forward along the inversion portion in the hull width direction. A small vessel characterized in that a water outlet is provided on an outer side in the hull width direction of the shade portion that is laterally symmetrical with respect to the arm portion.