JP2976253B2 - Water jet thruster deflector device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflector for a water jet propulsion device used for a small boat such as a pleasure boat.

[0002]

2. Description of the Related Art In a small boat such as a pleasure boat, a water-jet propulsion device is used, in which an impeller rotated by an engine injects water backward from a nozzle and moves forward in reaction to the water. Then, the deflector is attached to the back side of the nozzle that sprays water so that it can be covered from above, and when moving forward, the deflector is flipped up, and when moving backward, the deflector is covered on the back side of the nozzle, The flow of the jet flow is converted forward so that it can move backward.
The deflector can be turned by a lever on the ship via a shift cable. For example, JP-A-3-
See No. 65492.

[0003]

When the vehicle travels in reverse, the deflector receives a reaction force that changes the flow of water, and the deflector tends to lift. Also, when jumping up the deflector, people may get on and off and get on,
At this time, a force for lowering the deflector is applied. The force applied to this deflector is transmitted to the push-pull type shift cable and is transmitted to the operation lever. For this reason, when a large force is applied, there is a disadvantage that the cable is bent or the stopper of the operation lever comes off. In addition, bending of the cable makes the positional accuracy of the deflector uncertain, and there is a disadvantage that the deflector rattles.

In view of the foregoing, the present invention relates to a shift cable for rotating a deflector for reverse movement up and down, when a reaction force applied to the deflector during reverse movement or when a foot is applied while the deflector is jumping up. An object of the present invention is to provide a deflector device for a water jet propulsion device that can prevent force from being applied.

[0005]

In order to achieve the above object, a deflector device for a water jet propulsion device according to the present invention is provided with a deflector mounted on a rear side of a nozzle of a water jet so as to be vertically rotatable. A fan-shaped cam is pivotally attached to the front side of one side and rotated with a shift cable, a projection with both sides recessed is formed in the center of the sector-shaped cam, and the projection is fitted into the recess at the front end of the deflector and the deflector is rotated. The deflector is fixed to the vertical position at the arc portions on both sides of the sector cam.

[0006]

By operating the shift cable back and forth with the lever in the ship, the sector cam can be turned, and the deflector can be turned up and down by the projection. Then, at the vertical position of the deflector, the vertical position on the front side of the deflector coincides with the upper and lower arc portions of the sector cam, and the vertical position is determined. When a force such as pushing up or pushing down is applied to the deflector in this state, the force is received by the arc portion of the sector cam, and no force is applied to rotate the sector cam. Therefore, no excessive force is applied to the shift cable.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the water jet propulsion device, a housing 2 is connected to a rear side of an intake duct 1 communicating with a bottom of the ship, and an impeller connected to a drive shaft 3 rotated by an engine is mounted in the housing 2.
Then, the nozzle 4 is connected to the rear side of the housing 2, and a ladder 5 is pivotally mounted on the rear end of the nozzle 4 so as to be rotatable left and right with a vertical axis. The impeller in the housing 2 injects water from the intake duct 1 side to the nozzle 4 side. By operating the rudder 5 left and right, the direction of the jet flow is bent left and right for steering.

A deflector 6 is arranged behind the nozzle 4 so as to cover the ladder 5. The deflector 6
It is axially mounted on the side surface of the nozzle 4 so as to be rotatable up and down on a horizontal axis. The deflector 6 may be mounted on the undercover 7 as shown in FIG. On one front side of the deflector 6, a fan-shaped cam 8 is pivotally mounted so that it can be rotated by a push-pull type shift cable 9, and the front end of the shift cable 9 is operated by a lever 10 in the ship.
The fan-shaped cam 8 has a projection 12 having a concave portion on both sides at the center of the circular arc portion 11 on both sides. At the front end of the deflector 6, a concave portion 13 into which the projection 12 fits is formed, and a concave curved surface 14 is formed above and below it. As shown in FIG. 5, the concave portion 13 and the concave curved surface 14 of the deflector 6 may be separately made of a stainless steel plate 15 and attached to the deflector 6. The fan-shaped cam 8 is made of a stainless steel plate, and the deflector 6 is made of an aluminum alloy alumite film, so that the hardness can be increased and electric corrosion can be prevented. In addition, by attaching the stainless steel plate 15 to the deflector 6, the deflector 6 can be made of a hard synthetic resin and can be reduced in weight.

When moving forward, as shown in FIG. 3, the projection 12 of the sector cam 8 pushes the deflector 6 downward, and the deflector 6 is jumped upward to form a concave curved surface 11 on the upper arc portion 11 of the sector cam 8. Hit 14 to stop. When moving backward, as shown in FIG. 4, the concave portion 13 is pushed upward by the projection 12, the deflector 6 is put on the rear side of the nozzle 4, and the concave curved surface 14 is brought into contact with the lower circular arc portion 11 and stopped. .
Also, as shown in FIG. 2, on the opposite side of the deflector 6,
A stopper 17 provided on the nozzle 4 by protruding the arm 16
It is made to hit.

The deflector 6 is positioned such that the upper and lower concave surfaces 14 abut the arc 11 of the sector cam 8 at the forward and backward positions. When a force for pushing up or pushing down is applied to the deflector 6,
Although a force is applied to push forward, no force is applied in the direction in which the sector cam 8 rotates. For this reason, no excessive force is applied to the shift cable 9, the strength requirements of the shift cable 9 and the lever 10 are small, and the weight can be reduced.

As shown in FIG. 7, a stopper 18 of the deflector 6 may be mounted above the nozzle 4. Further, as shown in FIG.
In addition, a notch 19 for directing water upward is provided, and a water flow is applied to the deflector 6 that has jumped up. By applying a water pressure to the deflector 6 that has jumped up, the backlash of the deflector 6 can be prevented. 9 and FIG.
As shown in the figure, a hole 20 for applying water pressure when the deflector 6 is jumped up may be provided above the nozzle 4 or the ladder 5. In addition, by attaching the under cover 7 as shown in FIG. 6, the deflector 6 can be removed together with the under cover 7, and maintenance becomes convenient. And since the nozzle 4 and the deflector 6 do not contact directly, the electrolytic corrosion of the main body side of the nozzle 4 etc. can be prevented. In addition, as shown in FIG. 7, by providing a stopper 18 such as a cushion material on the nozzle 4, a predetermined repulsive force can be given to the deflector 6 at the time of forward movement. This can prevent the deflector 6 from rattling.

[0012]

As described above, since the present invention is constructed as described above, the deflector can be turned up and down by the sector cam rotated by the shift cable, and the deflector is formed by the arc portions on both sides of the fan cam. The upper and lower positions can be determined and fixed. And, even if a force to push up or push down is applied to the deflector, no force in the direction of rotation is applied to the sector cam, and excessive force is not applied to the shift cable and lever, so the strength requirement is low, The weight can be reduced.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a partial plan view showing an embodiment of the present invention.

FIG. 3 is a side view showing a deflector position during forward movement according to the embodiment of the present invention.

FIG. 4 is a side view showing a deflector position when the vehicle is moving backward according to the embodiment of the present invention.

FIG. 5 is an exploded perspective view of a main part showing an embodiment of the present invention.

FIG. 6 is a perspective view illustrating a case where an under cover according to an embodiment of the present invention is provided.

FIG. 7 is a perspective view showing a case where a stopper is provided on a nozzle according to an embodiment of the present invention.

FIG. 8 is a perspective view of the undercover according to the embodiment of the present invention, in which a notch for water flow is provided.

FIG. 9 is a perspective view of a nozzle according to an embodiment of the present invention in which a branch hole is provided.

FIG. 10 is a perspective view of a ladder according to an embodiment of the present invention, in which a branch hole is provided.

[Explanation of symbols]

 Reference Signs List 4 Nozzle 6 Deflector 8 Sector cam 9 Shaft cable 11 Arc section 12 Projection 13 Recess

Claims (1)

(57) [Claims] 1. A deflector is mounted on the rear side of a nozzle of a water jet so as to be rotatable up and down. A sector cam is pivotally mounted on a front side of one side of the deflector and is rotated by a shift cable. Water characterized by forming projections with recesses on both sides, fitting the projections into the recesses at the front end of the deflector, rotating the deflector, and fixing the deflector in the vertical position by the arc portions on both sides of the sector cam. Deflector device for jet propulsion.