JP3349022B2 - Water jet propulsion 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 water jet propulsion device used as a propulsion device for a personal watercraft.

[0002]

2. Description of the Related Art A water jet propulsion device is used as a propulsion device in a boat such as a personal watercraft for leisure. As such a water jet propulsion device, as shown in a vertical sectional view in FIG. 5, a fixed nozzle 22 for narrowing a flow path is provided at a rear end of a pump case 21 for accommodating a rotating impeller 20.
A tilt nozzle 24 is attached to the rear end of the fixed nozzle 22 via a horizontal support shaft 23 so as to be rotatable up and down.
Further, a steering nozzle is known in which a steering nozzle 26 is attached to the rear end of the tilt nozzle 24 via a vertical support shaft 25 so as to be rotatable left and right. The tilt nozzle 24 and the steering nozzle 26 are connected to an operation handle via push-pull cables (not shown) for up-down rotation and left-right rotation, respectively (JP-A-62-205894).

In this water jet propulsion device, when the operation handle is turned to the right, for example, the steering nozzle 26 turns right around the vertical support shaft 25 in conjunction therewith, and the hull turns right. At the same time, the tilt nozzle 24 rotates upward about the horizontal support shaft 23 in conjunction with the rotation of the operation handle. This makes it possible to prevent the rear part of the hull from lowering during turning and prevent the rear part from sliding on the water surface.

[0004] Separately from this, as shown in a vertical sectional view in FIG. 6, a rear end of a fixed nozzle 22 provided at the rear end of a pump case 21 for narrowing a flow path is provided with a predetermined angle in the vertical direction. It is known that a steering nozzle 29 is rotatably mounted via support shafts 27 and 28 inclined by θ, and the steering nozzle 29 is connected to an operation handle via a push-pull cable (Japanese Patent Laid-Open No. Hei 2 (1998) -207). -248922
No.). In this water jet propulsion device, when the operation handle is turned to the right, for example, the steering 26 turns right around the support shafts 27 and 28 in conjunction therewith, and tilts upward. As a result, the hull turns right,
In addition, when turning, the rear part of the hull is lowered, and the hull does not slide on the water surface, so that the turning performance is improved.

[0005]

However, in the case of the water jet propulsion device shown in FIG. 5, in order to tilt the tilt nozzle 24 upward in conjunction with the left and right rotation of the steering nozzle 26, these nozzles are pushed by two pushers. Since the connection mechanism is connected to the operation handle by the pull cable, the cooperation mechanism becomes complicated, and the rotation angle (tilt angle) of the tilt nozzle 24 is linearly changed with respect to the rotation angle (steering angle) of the steering nozzle 26. However, it is difficult to set an appropriate tilt angle according to the steering angle.

In the case of the water jet propulsion device shown in FIG.
The change in the tilt angle with respect to the steering angle is small, and if the amount of change in the tilt angle is to be increased, the support shafts 27, 28
Must be set larger, and the overall length of the device becomes longer. Also in this case, the tilt angle changes only in a certain relationship with the change in the steering angle.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and it is possible to change a tilt angle in a desired relationship with respect to a steering angle, and to simplify a cooperation mechanism between an operation handle and a steering nozzle. It is an object to provide a jet propulsion device.

[0008]

According to a first aspect of the present invention, there is provided a water jet propulsion apparatus comprising: a fixed nozzle for discharging a fluid pressurized by a rotating impeller; and a rear end of the fixed nozzle. attached to right and left direction and the vertical on
A steering nozzle to pivot toward said an operating member for rotating the steering nozzle in a horizontal direction, further, one guide member of the fixed nozzle and the steering nozzle, in sliding contact with the guide member to the other wherein the guide surface for rotating the steering nozzle vertically upward in conjunction with the rotation of the lateral direction of the steering nozzle, in which respectively.

A water jet propulsion device according to a second aspect of the present invention has a fixed nozzle for discharging a fluid pressurized by a rotating impeller, and a left side attached to a rear end of the fixed nozzle.
The steering nozzle includes a steering nozzle that rotates rightward and vertically upward , and an operating member that rotates the steering nozzle in the left-right direction. Further, a pin protrudes from one of the steering nozzle and the fixed nozzle, and in which cam groove in sliding contact with the pin to rotate the steering nozzle vertically upward in conjunction with the rotation of the lateral direction of the steering nozzle is provided.

[0010]

According to the water jet propulsion device according to the first aspect, when the steering nozzle is rotated in the left-right direction, the sliding position of the guide surface that slides on the guide member changes, and the steering is performed according to the change. The nozzle rotates vertically upward .

Further, according to the water jet propulsion device of the present invention, when the steering nozzle is rotated in the left-right direction, the sliding position of the guide groove that slides on the pin changes, and the steering is changed according to the change. The nozzle rotates vertically upward .

[0012]

Embodiments of the present invention will be described below with reference to the drawings. 1A is a longitudinal sectional view showing one embodiment of the present invention, FIG. 1B is a sectional view taken along line II of FIG.
(C) is a bottom view. In FIG. 1, a water jet propulsion device 1 is a propulsion device attached to, for example, a rear bottom of a personal watercraft, and an impeller 2 is connected to a shaft 30 that is rotationally driven by an engine (not shown) via a spline. The impeller 2 is housed in a cylindrical pump case 3. The pump case 3 includes a boss 32 having a built-in bearing 31 for supporting a shaft 38 to which the impeller 2 is screwed, and a vane (stationary vane) 33 formed on the outer periphery of the boss 32. It is fixed by mounting means such as bolts.
At the front of the pump case 3, an intake port (not shown) for taking in water W is formed. At the rear end of the pump case 3, a fixed nozzle 4 for narrowing the flow path is attached with a bolt (not shown). Attached by means.

At the rear end of the fixed nozzle 4, there is provided a ring 5 which is an intermediate movable member corresponding to the tilt nozzle 24 (FIG. 5).
Steering nozzle 6 through the right and left direction and vertical on
It is attached so that it can rotate freely. That is, the ring 5 has a pair of left and right horizontal support shafts 7, 7 perpendicular to the axis L of the fixed nozzle 4 on both sides of the outer peripheral surface of the fixed nozzle 4.
Through the horizontal support shaft 7 so as to be rotatable up and down. On the other hand, the front end of the steering nozzle 6
The upper and lower portions of the ring 5 are supported via a pair of vertical support shafts 8, 8 so as to be rotatable left and right about the vertical support shaft 8. In this embodiment, the horizontal support shaft 7 and the vertical support shaft 8 are formed by stepped bolts, and the horizontal support shaft 7 is screwed into the fixed nozzle 4 and fixed.
Are screwed into the intermediate movable member 5 and fixed.

A guide plate 9 having a guide surface 9a formed at a front end thereof is fixed to a lower portion of the steering nozzle 6, and the guide surface 9a is in sliding contact with a guide pin 10 vertically provided below the fixed nozzle 4. The guide surface 9a is shown in FIG.
As shown in the figure, the shape is formed in a bilaterally symmetric mountain shape having a smooth curved surface. At the lower end of the guide pin 10, a guide pin 1
A retaining washer 11 for preventing the guide plate 9 from dropping off from the lower end of the "0" is attached. Steering nozzle 6
One side is an operating member 1 such as a push-pull cable.
2 is connected to an operation handle (not shown) on the upper part of the hull through a cooperation mechanism provided with 2.

Next, the operation of the above configuration will be described. The water W taken into the pump case 3 from the outside and pressurized by the impeller 2 is accelerated in the restricting flow path of the fixed nozzle 4 and is jetted from the rear, and the boat is propelled using the reaction force as a thrust.

When the operating handle is turned, for example, to the right, this movement is transmitted to the steering nozzle 6 via the operating member 12, and the steering nozzle 6 is moved about the vertical support shaft 8 as shown in FIG. ), The control handle is turned rightward by an angle θ1 corresponding to the turn amount of the operation handle. At this time, the guide plate 9 is rotated rightward integrally with the steering nozzle 6.
Then, the sliding contact position of the guide surface 9a with the guide pin 10 on the fixed nozzle 4 side shifts from the center to the side. As a result, the lower portion of the steering nozzle 6 is pushed rearward, and the steering nozzle 6 rotates upward about the horizontal support shaft 7 as shown in FIG. That is, in conjunction with the left and right steering of the steering nozzle 6, the steering nozzle 6 changes the angle θ2 according to the change in the curved surface of the guide surface 9 a.
Only tilt upwards. This tilting operation lowers the rear part of the hull. The tilt angle with respect to the steering angle θ1, that is, the inclination angle θ2 of the steering nozzle 6, can be set freely even at an operation angle during turning the steering by changing the curved surface of the guide surface 9a.

In the above embodiment, the guide pin 10 on the steering nozzle 6 side is connected to the guide pin 10 on the fixed nozzle 4 side.
The guide surface 9a of FIG.
(A), a cam groove 14a may be formed in the guide plate 14 fixed to the steering nozzle 6 side, and the guide pin 10 on the fixed nozzle 4 side may be slidably engaged with the cam groove 14a. Further, in the above embodiment, in addition to the restriction by the retaining washer 11, as shown in FIG.
The guide plate 9 is connected to the fixed nozzle 4 through the
The guide plate 10 may be regulated with the restoring force of 5 so that the guide surface 10a always slides on the guide pin 10.

As shown in FIG. 4, a cam groove 16 is provided on the fixed nozzle 4 side, and a guide pin 17 is provided on the steering nozzle 6 side.
May be provided respectively.

Further, in the above embodiment, the steering nozzle 6 is rotatably connected to the rear end of the fixed nozzle 4 via the ring 5 which is an intermediate movable member. However, the present invention is not limited to this. The steering nozzle 6 may be rotatably connected directly to the rear end of the fixed nozzle 4 via the intermediary.

[0020]

As described above, according to the first aspect of the present invention, one of the steering nozzle and the fixed nozzle is provided with a guide member, and the other is slidably contacted with the guide member so as to rotate the steering nozzle in the left-right direction. Since the guide surfaces for rotating the steering nozzle vertically upward in conjunction with are provided, it is possible to change the tilt angle with respect to the steering angle in a desired relationship including a non-linear relationship,
The cooperation mechanism between the operation handle and the steering nozzle can be simplified.

According to the second aspect of the present invention, a pin is provided on one of the steering nozzle and the fixed nozzle, and the other is slidably contacted with the pin to interlock with the left and right rotation of the steering nozzle. Since the cam groove for rotating the nozzle vertically upward is provided, a tilt operation interlocked with the left and right rotation of the steering nozzle can be performed smoothly. Further, the tilt angle can be changed in a desired relation including the non-linear relation with the steering angle, and the cooperation mechanism between the operation handle and the steering nozzle can be simplified.

[Brief description of the drawings]

FIG. 1A is a longitudinal sectional view showing one embodiment of the present invention,
(B) is a sectional view taken along line II of (A), and (C) is a bottom view of the same.

FIG. 2 is an operation explanatory diagram of the embodiment.

FIG. 3A is a bottom view of the second embodiment, and FIG. 3B is a bottom view of the third embodiment.

FIG. 4 is a longitudinal sectional view of a fourth embodiment.

FIG. 5 is a longitudinal sectional view of a conventional example.

FIG. 6 is a longitudinal sectional view of another conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Water jet propulsion device, 2 ... Impeller, 3 ... Pump case, 4 ... Fixed nozzle, 5 ... Ring (middle movable member),
Reference numeral 6: steering nozzle, 9a: guide surface, 10: guide pin (guide member), 14a: cam groove, 16: cam groove, 17: guide pin

Claims (2)

(57) [Claims] 1. A fixed nozzle for discharging the boosted by the rotating impeller fluid, and the steering nozzle rotates in the horizontal direction and the vertical upward attached to a rear end of the fixed nozzle, a horizontal direction the steering nozzle An operation member for rotating the steering nozzle; and a guide member on one of the steering nozzle and the fixed nozzle, and a sliding member on the other side in sliding contact with the guide member, and interlocking with the rotation of the steering nozzle in the left-right direction . A water jet propulsion device in which guide surfaces for rotating a nozzle vertically upward are provided. Wherein a fixed nozzle for discharging the fluid which has been pressurized by the rotating impeller, and the steering nozzle rotates vertically upward and lateral direction is mounted to the rear end of the fixed nozzle, said steering nozzle lateral direction An operating member for rotating the steering nozzle is provided. Further, a pin is protruded from one of the steering nozzle and the fixed nozzle, and the other slides in contact with the pin and interlocks with the rotation of the steering nozzle in the left-right direction . A water jet propulsion device provided with a cam groove for rotating a steering nozzle vertically upward .