JP2987991B2 - Jet propulsion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[Object of the invention]

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jet propulsion device.

[0003]

2. Description of the Related Art As a drive device used for small boats,
There is a jet propulsion device in which an impeller is driven by an engine, water is suctioned and pressurized by the impeller, jetted into the water from a stern nozzle, and the boat is propelled by the reaction force.

[0004] This jet propulsion device conventionally has an impeller housing 2 and a stator 3 at the rear of an intake duct 1 having a water intake port on the lower surface as shown in an exploded view in FIG.
The drive shaft 7 is inserted through a bearing 5 and an oil seal 6 into a bearing portion 4 at a front portion of the intake duct 1 and connected to an engine 8. The impeller is located at a position of the impeller housing 2 of the drive shaft 7. 9 is fixed by screwing.

A nozzle 10 is fixed to a rear portion of the stator 3, and a steering rudder 11 is connected to the nozzle 10 by a vertical upper and lower bolt 12 so as to be able to swing. A steering cable is connected to the rudder 11. Are connected.
Therefore, the boat is propelled by the pressurized water jetted from the nozzle 10 and the rudder 11 by the rotation of the impeller 9, and the rudder 1
By turning the steering wheel 1 right or left and steering it, the boat can change course to the left or right.

Some of such jet propulsion devices are provided with a reversing device for reversing a boat. A conventional reverse drive is disclosed in, for example, Japanese Patent Application Laid-Open No. 59-4143.
No. 6 and Japanese Utility Model Laid-Open Publication No. Sho 54-112299.

In the conventional reverse drive, a deflector mounting portion 11a is provided on the rudder 11, and the bearing bosses on the left and right side walls 15 of the deflector 14 having the arc-shaped wall portion 13 are mounted on the rudder 11 by horizontal bolts 16. Operating cable 1 attached to one end of the deflector 14
13 is changed from the state of FIG. 12 to the state of FIG. 13 by pulling 7, the water flow squirting from the ladder 14 is applied to the wall portion 13, the water flow direction is reversed from A to B, and the boat moves backward. It is.

[0008]

However, in the conventional structure, since the deflector 14 is attached to the ladder 11, the force received by the deflector 14 is
Is directly received, it is necessary to give the deflector mounting portion 11a of the rudder 11 a large strength,
There has been a problem that the number of parts is large and the size has to be increased. In addition, since the deflector 14 moves together with the rudder 11 during steering, wiring of the control cable is difficult, and the deflector 14 moves right and left together with the rudder 11, so that the cable 1 which raises and lowers the deflector 14 at the same time is used.
It is also necessary to swing the cable 7 and the cable supporting portion, and it is necessary to make the structure swingable, and there is a problem that the structure becomes complicated.

The present invention has been made in view of the above-described circumstances, and the wiring of the operating cable and the structure of its support can be simplified by independently operating the deflector, thereby affecting steering. It is an object of the present invention to provide a jet propulsion device that does not have any problem. [Configuration of the invention]

[0010]

In order to solve the above-mentioned problems, a jet propulsion device according to the present invention is driven by an engine in an impeller housing joined to a rear portion of an intake duct installed in a boat. The impeller has a rotation, and the rotation of the impeller pressurizes the water sucked from the water inlet of the intake duct to jet out from a nozzle joined to a rear portion of the impeller housing, thereby obtaining a thrust by a reaction force and turning to a rear portion of the rudder. In a jet propulsion device having a configuration in which the water flow is changed by an opposing deflector to reverse the boat, the deflector is pivotally mounted on a fixed member such as a nozzle fixed to an intake duct or an impeller housing so as to be capable of turning operation. A hole for water circulation is opened in the side wall of the deflector.

[0011]

[Function] To move the boat backward, turn the deflector to make the wall face the rudder, the water flow ejected from the rudder is deflected, and the water flow flows in the opposite direction, and the reaction force causes the boat to move backward. I do. At this time, there is a hole in the side wall of the deflector, so it is effective when steering the rudder, and when running backward, water escapes from this hole, so the force received by the deflector decreases, and the strength of the mounting part is not required, and the structure is simple. Become.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a jet propulsion device according to the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded view of the present invention, in which an intake duct 20 has a bearing 2 at its rear and front portions.
Drive shaft 23 is rotatably supported by bearings 21 and 22 via bearings 24 and 25 and oil seals 26 and 27. An impeller 28 is provided at the rear end of drive shaft 23. The impeller 28 is screwed and housed in an impeller housing 29 connected to the rear surface of the intake duct 20. The driving of the impeller 28 pressurizes and jets water backward. A nozzle 30 is fastened to the rear of the impeller housing 29 together with the impeller housing 29 by bolts 31. A ladder 32 is attached near the end of the nozzle 30 by a vertical bolt 31 so as to be able to swing right and left.

A bearing 33 is provided on the side of the nozzle 30 near the base.
Are provided in the bearing portion 33 in the horizontal direction, and the intermediate portions of the side walls 35 of the deflector 34 are attached to the bearing portion 33 via bolts 37, 37 via spacers 36, and the deflector side wall portions 38 are provided.
Is mounted to be vertically swingable so as to take a position facing the rear end of the nozzle 30 and a position retracted upward.

The side wall 35 of the deflector 34 is provided with a hole 39 for letting out the jet water flow and effecting the rudder, and a hook 4 screwed to an end of one side wall 35 is provided.
The tip of push cable 41 is ball joint 4
The deflector 34 is turned by operating the push cable 41. The hole 39 is not limited to a single hole.
May be provided with a number of small holes 43, 43,..., And the holes 39 in the left and right side walls 35 may not necessarily be the same shape and size. In other words, the effectiveness of the left and right rudder differs depending on the rotation direction of the impeller 28 and the like.
Are different between the left and right sides, the same turning performance can be obtained on the left and right sides according to the steering operation amount.

Next, the operation will be described.

FIG. 3 shows a side view of a state of forward movement.
The water sucked in the direction A from the water inlet of the intake duct 20 is accelerated by the impeller 28 and discharged in the direction B as a jet stream, and the boat advances with the thrust generated by the reaction force. Also, as shown in FIG.
When the watercraft 1 is swung to the left or right around the center, the jet water jet discharge direction changes, and the traveling direction of the boat changes to the right or left, and the boat is steered. That is, at the time of forward turning, the water flow is discharged in the C direction by swinging the rudder 32 to the right as shown in FIG. 5, and the boat turns right.

FIG. 6 shows a side surface when the vehicle is moving backward, and the side wall 35 of the deflector 34 is rotated to a position facing the nozzle 30. The water sucked from the water intake of the intake duct 20 travels in the direction D, passes through the ladder 32, and is deflected in the direction E by the wall 38 of the deflector 34, and the reaction force causes the boat to move backward. be changed.

FIG. 7 shows a plane in the reverse state, in which the rudder 32 is swung to the right, and the water flow is also ejected in the F direction through the hole 39 in the side wall 35 of the deflector 34. At the same time, as shown in FIG. 8, the boat also jets in the G direction, so that the boat moves backward while turning left in the H direction shown in FIG.

FIGS. 9 and 10 show the water flow at the time of turning right when the vehicle is neutral. This neutral state means that the deflector 34 is located at an intermediate position between forward movement and reverse movement.

In the illustrated embodiment, the deflector 34
Is shown attached to the nozzle 30, but this may be attached to the impeller housing 29.

[0022]

As described above, according to the present invention, since the deflector does not swing together with the ladder, the degree of freedom of wiring of the control cable is increased, and the control cable can be freely set. In addition, since the deflector is attached to the fixing member, no load acts on the ladder, and the ladder can be simplified and reduced in weight. A hole is formed in the side wall of the deflector to allow the water flow to escape, so that the rudder is effective and steering can be easily performed when the vehicle is moving backwards. Therefore, a large rigidity is not required for the entire structure, and it is possible to construct a lightweight, compact and inexpensive structure. If the deflector is further positioned between forward and reverse, the boat will not advance or reverse, but if the rudder is steered in this state, the boat will turn in place, and will therefore take off and land in a narrow space. Can be done very easily.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a modification of the deflector.

FIG. 3 is a side view at the time of forward movement.

FIG. 4 is a plan view at the time of forward movement.

FIG. 5 is a plan view at the time of forward right turning.

FIG. 6 is a side view when the vehicle is moving backward.

FIG. 7 is a plan view at the time of turning backward and left.

FIG. 8 is a side view at the time of reverse left turning.

FIG. 9 is a plan view at the time of turning right during neutral.

FIG. 10 is a plan view at the time of turning right when in neutral.

FIG. 11 is an exploded perspective view of a conventional jet propulsion device.

FIG. 12 is an explanatory view showing a conventional jet propulsion device at the time of forward movement.

FIG. 13 is an explanatory view showing a conventional jet propulsion device moving backward.

[Explanation of symbols]

 1 Intake Duct 2 Impeller Housing 7 Drive Shaft 8 Engine 9 Impeller 10 Nozzle 11 Ladder 14 Deflector 20 Intake Duct 23 Drive Shaft 28 Impeller 29 Impeller Housing 30 Nozzle 32 Ladder 34 Deflector 35 Side Wall 38 Wall 39 Hole

Claims (1)

(57) [Claims] An impeller driven by an engine is provided in an impeller housing joined to a rear portion of an intake duct installed in a watercraft, and the rotation of the impeller pressurizes water sucked from a water inlet of the intake duct. A jet propulsion device having a configuration in which a jet is ejected from a nozzle joined to a rear portion of the impeller housing, a thrust is obtained by a reaction force thereof, and a boat is turned backward by turning to the rear portion of the rudder and changing a water flow by an opposing deflector. 3. The jet propulsion device according to claim 1, wherein the deflector is pivotally mounted on a fixed member such as a nozzle or an impeller housing fixed to an intake duct, and a hole for water circulation is opened in a side wall of the deflector.