JP2002178988A - Water jet propulsion boat reversing device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] When moving a reverse bucket in order to change one of the forward and backward propulsion states of a hull to the other state,
It is possible to prevent the hull from temporarily becoming largely inclined forward and downward, so that the riding comfort on the boat is maintained to be good. A watercraft (1) is provided with a water jet nozzle (17) capable of jetting water (2) backward from a hull (3) side, a "rear position" of the water jet nozzle (17), and a deviation from the "rear position". And a reverse bucket 25 supported by the hull 3 so as to be freely reciprocable A between the positions. A pair of left and right buckets 2 in which a reverse bucket 25 is supported on the hull 3
Each of the buckets 28 is capable of reciprocating in the width direction of the hull 3 between a “rear position” of the water injection nozzle 17 and each “outside position” on the left and right sides of the “rear position”. To be.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water jet propulsion type hull in which water jetted rearward from the hull side is turned forward and the hull can be moved backward by the reaction force. It relates to a reverse drive.

[0002]

2. Description of the Related Art The reversing device for a water jet propulsion type watercraft described above includes:
Conventionally, there is one disclosed in JP-A-3-65492.

According to the above publication, the watercraft includes a water jet nozzle supported by the hull and capable of jetting water rearward from the hull side, and the water jet nozzle disposed behind the hull and provided with the water jet nozzle. The "rear position" of the injection nozzle and this "rear position"
And a reverse bucket pivotally supported by the hull so as to be reciprocally rotatable between a position deviated from the water jet nozzle and a water jet from the water jet nozzle is located at a “rear position” of the water jet nozzle. The reverse bucket is guided by the front surface of the reverse bucket and is turned forward and reversed.

[0004] Then, the reverse bucket is rotated to position the reverse bucket at an "upper position" deviated from the "rear position" of the water injection nozzle, and passes through the water injection nozzle from the hull side. When you spray water,
This water is injected rearward irrespective of the reverse bucket, and by the reaction force of the water injection facing rearward,
The hull is in a forward propulsion state.

On the other hand, when the reverse bucket is rotated from the "upper position" of the water injection nozzle to the "rear position" and the water is injected from the hull through the water injection nozzle, This water is guided to the front of the reverse bucket, is turned forward and is turned forward, and is jetted forward.Therefore, due to the reaction force of the jet of water going forward, the hull is in a state of being propelled backward. Is done.

[0006]

However, the above-mentioned conventional technology has the following problems.

That is, when the reverse bucket is turned forward or backward in order to change from one of the forward and backward propulsion states of the hull to the other state, the middle of the rotation The reverse bucket described in is adapted to once guide the water jetted rearward from the water jet nozzle vertically downward and jet it downward.

Therefore, while the propulsion state is to be changed, the rear part of the hull is once pushed up by the reaction force of the downward jet of water as described above, and the hull is temporarily largely lowered forward. , Which is not preferable because it lowers the riding comfort of the boat.

The present invention has been made in view of the above-mentioned circumstances, and includes a forward and backward propulsion state of a hull.
When the reverse bucket is moved in order to change from one of the states to the other state, the hull temporarily prevents the hull from being largely inclined forward and downward during the movement, and It is an object of the present invention to keep a comfortable ride on the vehicle.

Another object of the present invention is to ensure a smooth propulsion state when the hull is propelled forward even in the case described above.

[0011]

SUMMARY OF THE INVENTION A water jet propulsion type boat reversing device according to the present invention for solving the above problems is as follows.

A first aspect of the present invention is a water jet nozzle 17 supported by the hull 3 and capable of jetting water 2 from the hull 3 side to the rear, and the water jet nozzle arranged behind the hull 3 A reverse bucket 25 supported by the hull 3 so as to be able to reciprocate A freely between a “rear position” of the nozzle 17 and a position deviated from the “rear position”; In a reversing device for a water jet propulsion type watercraft in which the jetted water 2 is guided forward by the front surface of the reverse bucket 25 located at the "rear position" of the water jet nozzle 17 and turned forward. ,

The reverse bucket 25 is provided with a pair of left and right buckets 28, 28 supported on the hull 3, and each of the buckets 28 is located at the "rear position" of the water injection nozzle 17.
And between the left and right “outside positions” of the “rear position”, respectively, so as to be reciprocally movable in the width direction of the hull 3.

According to a second aspect of the present invention, in addition to the first aspect, the rear portion of the hull 3 is arranged such that a bottom surface of the hull 3 as viewed from the rear faces outward from a center portion of the hull 3 in the width direction. In a reversing device for a water jet propulsion type boat, which is formed so as to be inclined upward, and the water jet nozzle 17 is disposed substantially at the central portion,

When the hull 3 is viewed from the rear, each of the buckets 2
Numeral 8 indicates a reciprocating movement A along the inclination of the bottom surface of the hull 3.

The invention according to claim 3 is the invention according to claim 1 or 2
In addition to the invention of the above, each of the buckets 28 is arranged such that, in a rear view of the hull 3, the projected area of the buckets 28, 28 at the "rear position" is smaller than that at the "outward position". , 28 can be changed in posture with the reciprocation.

[0017]

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

In FIG. 2, reference numeral 1 denotes a water jet propulsion type and saddle type small boat 1 which floats on the surface of water 2. The arrow Fr indicates the forward direction of the boat 1 in the propulsion direction, and the left and right described below refer to the width direction of the hull 3 of the boat 1 toward the front.

The hull 3 of the boat 1 has a hull 4 constituting a lower portion thereof, and a hull 4 covering an upper end opening of the hull 4.
Hull 4 and a gunnel 6 forming a joint between the outer edges of the hull 4 and the deck 5.

The hull 3 is substantially symmetrical with respect to a virtual center plane 7 extending in the front-rear direction and in the vertical direction, passing through the center in the width direction. The rear part of the hull 3 is upwardly raised as the bottom lower surface of the hull 4 of the hull 3 in a rear view (FIG. 4) is directed outward from the center (virtual center plane 7) of the hull 3 in the width direction. It is formed in an inverted mountain shape so as to incline toward it.

The boat 1 has a propulsion device 9 mounted on the hull 3 for propelling the hull 3. The propulsion device 9 includes an internal combustion engine 10, which is a driving source for propulsion of the hull 3 supported by the hull 3 inside the hull 3, and receives a driving force from the internal combustion engine 10 and receives a driving force from the rear side of the hull 3. Water jet injection means 11 for jetting water 2 toward the rear and propelling the hull 3 by its reaction force is provided.

The water jet injection means 11 is supported by the rear portion of the hull 4 and extends long in the front-rear direction, and has a front end opening downward below the rear portion of the hull 3 and a rear end rearward of the hull 3. And a propulsion which is disposed in a water passage 14 inside the water pipe 13 and is supported by the water pipe 13 and operatively connected to an output portion of the internal combustion engine 10 via a propulsion shaft 15. And a shaft 15.

The rear end of the water pipe 13 is formed as a water jet nozzle 17 which opens toward the rear of the hull 3. The water injection nozzle 17 is disposed substantially at the center of the rear part of the hull 3 in the width direction (on the virtual center plane 7), and is disposed at the middle part of the rear part of the hull 3 in the vertical direction.

A steering pipe 19 which is fitted to the water injection nozzle 17 from the rear and is supported at the rear of the hull 3 is provided. The steering pipe 19 has a rear part which is rotatable vertically and horizontally. The front end of the steering pipe 19 is supported on the hull 3 so as to be assured. On the other hand, a steering handle 20 for the hull 3 is supported on the front upper portion of the hull 3, and the steering pipe 19 is interlocked to the handle 20 by a cable or the like. Behind the handle 20, the hull 3
A straddle-type seat 21 is provided on the upper surface of the seat 2.
1. The steering wheel 2 is mounted on the steering wheel 2 by a driver seated forward.
0 is operable.

When the internal combustion engine 10 of the propulsion device 9 is driven, the driving force output from the internal combustion engine 10 is transmitted to the impeller 16 via the propulsion shaft 15, and the impeller 16 is driven to rotate. Then, the water 2 in the water passage 14 is accelerated rearward, whereby the water 2 below the rear part of the hull 3 is sucked into the water passage 14 from the front end of the water passage 14, The water passes through the water passage 14 and is jetted toward the rear of the hull 3 from the water jet nozzle 17 at the rear end. The hull 3 is brought forward by the reaction force of the water 2 injection.

At the time of the propulsion, the driver operates the steering wheel 20.
By operating the steering pipe 19 to change the attitude of the steering pipe 19, the direction of the jet of the water 2 is changed, whereby the hull 3 is steered in a desired direction.

In all the figures, the boat 1 has a reversing device 24 that enables the hull 3 to be propelled backward. The reversing device 24 is disposed behind the hull 3 and has a “rear position” near the water injection nozzle 17 (solid line in each figure).
A reverse bucket 25 which is reciprocally movable A between the "rear position" and an "outside position" (dashed line in each figure) deviated outward from the "rear position";
5 is supported on the rear portion of the hull 3 so as to make the reciprocating movement 5 free, and the reverse bucket 25 is inputted by inputting an operating force from an operator such as a driver of the boat 1.
Operating means 27 for reciprocating movement A.

The reverse bucket 25 is located almost entirely behind the hull 3, that is, when the hull 3 is viewed from the rear (FIG. 4), almost the entire reverse bucket 25 is located behind the hull 3. Overlapping. The reverse bucket 25 includes a pair of left and right buckets 28, 28 supported on the hull 3 by the support means 26. Each of the buckets 28 has the same shape and size as each other.
It is performed substantially in synchronization with each other with the virtual center plane 7 as a reference position, and takes the same posture at each moving position.

The bearing means 26 includes a bracket 31 supported by a fastener 30 at a rear portion of the water pipe 13 and supported by the hull 3, and the buckets 31, which are respectively reciprocated (rotated) by the bracket 31. A) a pivot support 32 for pivoting so as to be freely movable.

The pivot member 32 pivotally supports each of the buckets 28 on the bracket 31 and includes lower ball joints 34 and 35. A pair of left and right pivots connecting the upper and lower ball joints 34 and 35 is provided. The shafts 36 are inclined so as to face outward as they go downward, and these pivot shafts 36 are arranged substantially symmetrically with respect to the virtual center plane 7. Then, in the rear view of the hull 3 (FIG. 4), each of the buckets 28 extends along the inclination of the bottom lower surface of the hull 3 from the “rear position” and from the “rear position” to the right and left outer sides. The reciprocating movement A is performed between the deviated “outside position”.

The operating means 27 is provided on the bracket 3 so that the axis extends in the front-rear direction and is slidable in the axial direction.
1, a pair of left and right sliding shafts 37, 37 supported by 1; a pair of left and right interlocking links 38, 38 for interlockingly connecting the respective sliding shafts 37 and the rotating portions of the buckets 28; 37, 37, one end is connected, the other end is extended to the vicinity of the handle 20, and the other end is provided with an operation cable (not shown) as an operation unit.

When the buckets 28 are moved through the support means 26 by operating the manipulation cable of the manipulation means 27 and the buckets 28 are respectively positioned at the "outside position", the propulsion device 9, the water 2 jetted rearward from the hull 3 through the water jet nozzle 17 is jetted rearward irrespective of the buckets 28, as described above. Due to the reaction force, the hull 3 is propelled forward.

On the other hand, when the operation means 27 is operated on the operation cable, the buckets 28 are transmitted through the support means 26.
Is moved from the “outside position” to position each of the buckets 28 at the “rear position”, the water 2 injected from the hull 3 through the water injection nozzle 17 of the propulsion device 9 becomes , Front surface (inner surface) of each bucket 28
Is guided forward by the arcuate concave surface, is turned forward, is inverted, and is jetted forward. Therefore, the hull 3 is brought into a backward propulsion state by the reaction force of the water 2 going forward.

In the above case, in order to change one of the forward and backward propulsion states of the hull 3 from the other, the buckets 28 are moved to the "rear position" and "outward position". , These buckets 28 reciprocate A in the width direction of the hull 3 when moving forward or backward. For this reason, during this movement,
Each of the buckets 2 injected from the water injection nozzle 17
The water 2 which is diverted in the width direction and the rear of the hull 3 by 8
Although the ratio of the amount of water 2 is gradually changed, the ratio of the amount of water 2 diverted in the vertical direction does not significantly change.

In the course of movement of the buckets 28, the reaction forces of the water 2 diverted in the width direction of the hull 3 by the buckets 28 cancel each other, while the water diverted backward. The respective reaction forces of the two are regarded as a resultant force, and these force the hull 3 to be propelled backward.

Therefore, even if the water 2 jetted from the water jet nozzle 17 is diverted in the vertical direction during the movement of each of the buckets 28, the ratio of the amount of water 2 in the diverted stream changes greatly. Therefore, unlike the related art, the hull 3 is temporarily prevented from having a large forward-downward inclined posture, and the ride comfort on the boat 1 is kept good.

As described above, the rear part of the hull 3
The bottom surface of the hull 3 in the rear view (FIG. 4) is formed so as to incline upward from the center in the width direction of the hull 3 toward the outside, and the water injection nozzle 17 is disposed substantially in the center. Rear view of the hull 3 of the hull 1 installed (FIG. 4)
Thus, each of the buckets 28 reciprocates A along the inclination of the bottom surface of the hull 3.

Therefore, when each of the buckets 28 is reciprocated A, a part of each of the buckets 28
In the rear view of FIG. 4 (FIG. 4), it is possible to prevent the hull 3 from largely protruding downward from the bottom lower surface.

Therefore, in particular, when each of the buckets 28 is positioned at the “outside position” and the hull 3 is in a forward propulsion state, each of the buckets 28
Is suppressed, and a smooth propulsion state of the hull 3 is ensured.

In the rear view of the hull 3 (FIG. 4), each of the buckets 28, 28 at the "outer position" is smaller than the projected area of the buckets 28, 28 at the "rear position". The postures of the members 28, 28 can be changed with the reciprocation.

For this reason, when each of the buckets 28 is positioned at the “outside position” and the hull 3 is in a forward propulsion state, the water 2
Is suppressed to a small value, and a smooth propulsion state of the hull 3 is ensured.

Although the above description is based on the illustrated example, the bottom surface of the hull 3 may be inverted triangular. Further, the water injection nozzle 17 may have a pair of left and right nozzles with a central portion in the width direction of the hull 3 interposed therebetween. Each of the buckets 28 may reciprocate A in the horizontal direction in the width direction of the hull 3.

[0043]

The effects of the present invention are as follows.

According to the first aspect of the present invention, there is provided a water jet nozzle supported by a hull and capable of jetting water rearward from the hull side, and a "rear position" of the water jet nozzle disposed behind the hull. And a reverse bucket supported by the hull so as to be able to reciprocate between a position deviated from the "rear position" and water jetted from the water injection nozzle. In a reversing device for a water jet propulsion type boat that is guided by the front surface of the reverse bucket positioned at the "rear position" and is turned forward and reversed,

The reverse bucket has a pair of left and right buckets supported on the hull, and each of these buckets is located between a “rear position” of the water injection nozzle and each “outside position” of the left and right of the “rear position”. Are reciprocally movable in the width direction of the hull, and the following effects are produced.

That is, when each of the buckets is moved and each of the buckets is positioned at the “outside position”, the water jetted rearward from the hull side through the water jet nozzle of the propulsion device is discharged as described above. Regardless of each bucket,
The hull is jetted rearward, and the hull is propelled forward by the reaction force of the jet of water directed rearward.

On the other hand, when each of the buckets is moved from the “outer position” and each of the buckets is positioned at the “rear position”, the water injected from the hull through the water injection nozzle is reduced. The hulls are guided forward to the front of each of the buckets, are turned forward, and are jetted forward, so that the hull is propelled backward by the reaction force of the water directed forward.

In the above case, in order to change from one of the forward and backward propulsion states of the hull to the other state, each of the buckets is moved between the "rear position" and the "outer position". Each of these buckets when moving in
Reciprocate in the width direction of the hull. Therefore, during this movement, the ratio of the amount of water injected from the water injection nozzle and divided by the buckets in the width direction and the rear of the hull is gradually changed, but is divided in the vertical direction. There is no significant change in the ratio of the amount of water.

In the course of the movement of each bucket,
The reaction forces of the water diverted in the width direction of the hull by these buckets cancel each other, while the reaction forces of the water diverted rearward are combined, and these propel the hull rearward. Will be done.

Therefore, during the movement of each bucket,
Even if the water injected from the water injection nozzle is divided in the vertical direction, there is no large change in the ratio of the amount of water in the divided stream. This prevents the vehicle from being in the downwardly inclined position, so that the riding comfort of the boat is kept good.

According to a second aspect of the present invention, the rear portion of the hull is formed such that the bottom surface of the hull in a rear view is inclined upward from the center in the width direction of the hull toward the outside.
In a reversing device for a water jet propulsion type watercraft in which the water jet nozzle is disposed substantially at the center,

When viewed from the rear of the hull, each of the buckets reciprocates along the slope of the bottom surface of the hull.

Therefore, when each of the buckets is reciprocated, a part of each of the buckets is viewed from the rear of the hull.
It is prevented that the hull protrudes largely downward from the lower surface of the hull.

Therefore, in particular, when each of the buckets is positioned at the "outside position" and the hull is in a forward propulsion state, it is suppressed that the buckets become water resistant. Therefore, a smooth propulsion state of the hull is ensured.

According to a third aspect of the present invention, when the hull is viewed from the rear,
The posture of each of the buckets is changed along with the reciprocation so that the projected area of the bucket at the “outward position” is smaller than the projected area of the bucket at the “rear position”.

For this reason, when each of the buckets is positioned at the "outward position" and the hull is in the forward propulsion state, the resistance of water by each of the buckets is suppressed to a small value, and the hull smoothly moves. Proper propulsion state is ensured.

[Brief description of the drawings]

FIG. 1 is a plan sectional view of a rear part of a hull.

FIG. 2 is an overall side view of the boat.

FIG. 3 is a partially enlarged sectional view of FIG. 2;

FIG. 4 is a partially cutaway rear cross-sectional view of the rear part of the hull.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 boat 2 water 3 hull 7 virtual center plane 9 propulsion device 10 internal combustion engine 11 water jet injection means 17 water injection nozzle 24 reversing device 25 reverse bucket 26 support means 27 operating means 28 bucket 36 pivot shaft A reciprocating movement

Claims (3)

[Claims] 1. A water jet nozzle supported by a hull and capable of jetting water rearward from the hull side, a water jet nozzle disposed behind the hull, a rear position of the water jet nozzle, A reverse bucket supported on the hull so as to be able to reciprocate between the deviated positions,
In a reversing device for a water jet propulsion type watercraft in which water jetted from the water jet nozzle is guided to a front surface of the reverse bucket positioned at a rear position of the water jet nozzle and is turned forward and reversed. The reverse bucket includes a pair of left and right buckets supported on the hull, and each of these buckets reciprocates in a width direction of the hull between a rear position of the water injection nozzle and left and right outer positions of the rear position. A water jet propulsion hull reversing device designed to be movable. 2. A rear part of the hull is formed such that a bottom surface of the hull in a rear view is inclined upward from a center part in a width direction of the hull toward an outer side, and the water injection nozzle is substantially formed. The water jet propulsion hull reversing device disposed in the center portion, wherein each of the buckets reciprocates along an inclination of a bottom lower surface of the hull when the hull is viewed from the rear. Reverse drive for water jet propulsion boats. 3. The position of each of the buckets is changed in accordance with the reciprocation of the hull such that the bucket at the outer position is smaller than the projected area of the bucket at the rear position in a rear view of the hull. The reverse drive device for a water jet propulsion type boat according to claim 1 or 2, wherein