JPH115595A - Deflector device for propulsive unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the operability of steering by reducing a load received from a flow of water by a deflector. SOLUTION: This deflector device for a propulsion unit is constituted such that the direction of water jet is varied by turning operation of a deflector 19 of the propulsion unit which sucks water and jets it from the deflector. A throat part 19c is formed in a part of the deflector 19, with outlet part flared. Since the throat part 19c is formed on a part of the deflector 19 with the outlet part flared, throttling of water in the deflector 19 is suppressed, water flows smoothly, as a result, a load received from water flow to the deflector 19 is reduced, only small operating force is required for turning operation of the deflector 19 to enhance the operability of steering.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflector device for a propulsion unit that changes the direction of water jet by turning the deflector of a propulsion unit that sucks water and jets it from a deflector.

[0002]

2. Description of the Related Art For example, a propulsion unit provided in a small boat such as a watercraft has a required thrust by sucking water and injecting the water from a deflector.
The deflector is supported rotatably at least left and right,
A small boat by turning a steering shaft rotatably mounted on the upper part of the hull by steering operation to rotate a deflector to the left and right via an operation cable, and changing the jetting direction of water flow from the deflector. Is steered.

[0003]

Incidentally, in the conventional deflector device, the deflector is constituted by a tapered nozzle whose cross-sectional area is narrowed in the water jetting direction. There was room for improvement in steering operability.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a deflector device for a propulsion unit capable of reducing the load on a deflector from a water flow and improving the steering operability. To provide.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, water is injected by turning the deflector of a propulsion unit that sucks water and injects the water from the deflector. In a deflector device of a propulsion unit for changing a direction, a throat portion is formed in a part of the deflector, and an outlet shape thereof is widened.

According to a second aspect of the present invention, in the first aspect, the throat portion is formed at a position of 2% to 30% from an outlet with respect to the entire length of the deflector.

According to a third aspect of the present invention, in the first or second aspect, an inner surface of the outlet of the deflector is a tapered surface having an angle of 2 ° to 5 °.

According to a fourth aspect of the present invention, in the first or second aspect of the present invention, the inner surface of the outlet portion of the deflector is an arcuate surface.

Therefore, according to the present invention, since the throat portion is formed in a part of the deflector and the outlet portion is formed to have a divergent shape, the restriction of the water deflector is suppressed, and the water flows smoothly through the deflector. As a result, the load that the deflector receives from the water flow is reduced, and the operability of the steering is improved because the operating force required for the turning operation of the deflector is small.

[0010]

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

FIG. 1 is a side view of a watercraft, FIG. 2 is a plan view of the watercraft, FIG. 3 is a side view of a deflector of a propulsion unit, FIG. 4 is a sectional view taken along line AA of FIG. Is a front view of the deflector (a view in the direction of arrow B in FIG. 3), and FIG.
7 is a detailed enlarged view of a portion D in FIG. 6.

First, a schematic configuration of the watercraft 1 shown in FIGS. 1 and 2 will be described.

The hull 2 of the watercraft 1 according to the present embodiment.
A hull 2a made of FRP (fiber reinforced plastic) and a deck 2b are connected by a gunnel 2c, and a water-cooled two-cylinder engine 3 as a driving source is mounted at a substantially central portion in the longitudinal direction in the hull 2. A fuel tank 4 is provided in front of the engine 3.

The upper portion of the fuel tank 4 of the hull 2 is covered by a cowling 5, and a steering shaft 6 is provided on the rear of the cowling 5 so as to be inclined obliquely upward toward the rear. A steering handle 6 is attached to the upper end of the steering shaft 7.
A seat 8 is detachably provided behind the seat.

The engine 3 has two cylinders arranged in the front-rear direction. The engine is elastically supported on the bottom of the hull 2 through a plurality of engine mounts (not shown). Are arranged in the longitudinal direction of the hull 2. Exhaust ports (not shown) of each cylinder are opened at equal intervals in the front-rear direction on the left end surface (left side in the traveling direction) of the engine 3, and an exhaust manifold 10 is connected to these exhaust ports. I have. The exhaust manifold 10 rises upward after extending forward, and an exhaust pipe 11 is connected to an end thereof.

The exhaust pipe 11 extends substantially horizontally toward the rear above the engine 3 and is then bent at a substantially right angle to the left, and further bent downward to extend substantially horizontally rearward. It is connected to a front part of a water lock 12 disposed on the left rear side of the engine 3. An exhaust pipe 13 extends upward from a rear upper surface of the water lock 12, and the exhaust pipe 13 extends rearward of the hull 2 and has a rear end opening into water. Although not shown, an intake device such as an intake pipe and an intake box is connected to a right end surface of the engine 3.

A propulsion unit 14 is provided at the rear of the hull 2. The propulsion unit 14 has a housing 15 that opens to the bottom and rear of the boat. An impeller shaft 16 arranged coaxially with 9 faces. The impeller shaft 16 is connected to the crankshaft 9 by a coupling 17, and a rear end of the impeller shaft 16 has a housing 15.
The impeller 18 housed inside is bound.

The rear end of the housing 15 is open rearward, and a deflector 19 constituting a deflector device according to the present invention is attached to the opening so as to be rotatable vertically and horizontally. I have. And
The deflector 19 is connected to an arm (not shown) connected to a lower end of the steering shaft 6 via an operation cable (not shown). Steering boat 1 is steered.

Here, the configuration of the deflector 19 constituting the deflector device according to the present invention will be described in detail with reference to FIGS.

Support portions 19a are provided on both left and right sides on the upstream side (housing 15 side) of the deflector 19 according to the present invention so as to protrude outward. The deflector 19 is supported by the left and right support portions (not shown). It is rotatably supported up and down by a ring. The upper and lower portions of the support ring are located at the housing 15 of the propulsion unit 14 (FIG. 1).
(See FIG. 2 and FIG. 2). Accordingly, the deflector 19 is rotatably supported up and down and left and right with respect to the housing 15 of the propulsion unit 14 as described above.

By the way, the deflector 19 according to the present invention.
Is a divergent nozzle (Laval nozzle). As shown in FIG. 6, a throat portion 19c having a minimum cross-sectional area is formed in a portion near the outlet 19b of the flow passage, and the flow passage is formed as shown in FIG. It is formed into a tapered nozzle shape whose cross-sectional area is gradually narrowed from the inlet 19d to the downstream (downward in FIG. 6) to the throat 19c, and from the throat 19c to the outlet 19
It is formed in a divergent shape whose cross-sectional area gradually increases toward b. That is, the exit portion shape of the deflector 19 is divergent, and the exit portion inner surface 19e is formed into an arc-shaped curved surface having a predetermined radius of curvature R as shown in detail in FIG.

Incidentally, as shown in FIG.
In the above, the throat portion 19c is formed at a position (x / L = 0.02 to 0.3) in which a distance x of 2% to 30% from the outlet 19b enters the entire length L of the deflector 19. Should.

The outlet inner surface 19e of the deflector 19, which forms a divergent shape, may be a tapered surface having an angle of 2 ° to 5 ° shown in FIG. 8 instead of the arcuate curved surface shown in FIG.

Next, the operation of the watercraft 1 according to the present embodiment will be outlined.

When the water-cooled engine 3 is driven in the personal watercraft 1, the rotation of the crankshaft 9 causes the coupling 1 to rotate.
7, and transmitted to the impeller shaft 16 of the propulsion unit 14, the impeller shaft 16 and the impeller 18 connected thereto.
Are integrally rotated at a predetermined speed.

When the impeller 18 is driven to rotate in the propulsion unit 14 as described above, the impeller 1
Since the water sucked from the bottom opening of the housing 15 is pressurized and jetted rearward from the deflector 19, a required propulsive force is generated by the water jet, and the propulsive force causes the hydroplane to slide. The boat 1 is made to run at a predetermined speed.

When the occupant operates the steering handle 7 to turn the steering shaft 6 right and left while the watercraft 1 is traveling, an arm (not shown) connected to the steering shaft 6 also moves the steering shaft. 6 is rotated left and right around the axis of the arm 6. The rotation of this arm is transmitted to the deflector 19 of the propulsion unit 14 via an operation cable (not shown), and the deflector 19 is rotated left and right. The direction of the water flow jetted from the deflector 19 changes, and the watercraft 1 is steered as described above.

In the present embodiment, since the throat portion 19c is formed in a part of the deflector 19 so that the outlet shape is widened, the water deflector 1c is formed.
9, the water flows smoothly through the deflector 19 and the load received by the deflector 19 from the water flow is reduced, and the steering force required for rotating the deflector 19 is small. Operability is improved. In particular, since the outlet inner surface 19e of the deflector 19 having a divergent shape is formed as an arcuate curved surface shown in FIG. 7 or a tapered surface having an angle of 2 ° to 5 ° shown in FIG. Separation from the inner wall surface is prevented, and the flow loss of water is minimized.

Although the above description has been made of an embodiment in which the present invention is applied to a deflector provided in a propulsion unit of a watercraft, the present invention is similarly applied to a deflector provided in any other propulsion unit. Of course, it is applicable.

[0030]

As is apparent from the above description, according to the present invention, since the throat portion is formed in a part of the deflector and the shape of the outlet portion is widened, the restriction of the water deflector can be suppressed. Water flows smoothly through the deflector, and as a result, the load received by the deflector from the water flow is reduced, and the effect that the operability of the steering is improved because the operation force required for the turning operation of the deflector is small is obtained. Can be

[Brief description of the drawings]

FIG. 1 is a side view of a watercraft.

FIG. 2 is a plan view of the watercraft.

FIG. 3 is a side view of a deflector of the propulsion unit.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a front view of the deflector of the propulsion unit (a view in the direction of arrow B in FIG. 3).

FIG. 6 is a sectional view taken along line CC of FIG. 5;

FIG. 7 is an enlarged detail view of a D part in FIG. 6;

8 is a view similar to FIG. 7, showing another form of the inner surface shape of the outlet of the deflector of the propulsion unit.

[Explanation of symbols]

 14 Propulsion unit 19 Deflector 19c Throat part 19e Inner surface of outlet of deflector

Claims (4)

[Claims] 1. A deflector device of a propulsion unit that changes a jet direction of water by rotating the deflector of a propulsion unit that sucks water and jets the water from a deflector, wherein a throat portion is provided in a part of the deflector. A deflector device for a propulsion unit, wherein the deflector device is formed so as to have a widened outlet. 2. A deflector device for a propulsion unit according to claim 1, wherein said throat portion is formed at a position of 2% to 30% from an outlet with respect to the entire length of said deflector. 3. An inner surface of the outlet of the deflector having an angle of 2 degrees.
The deflector device for a propulsion unit according to claim 1 or 2, wherein the deflector device has a taper surface of 5 to 5 degrees. 4. The deflector device for a propulsion unit according to claim 1, wherein an inner surface of an outlet portion of the deflector is an arc-shaped curved surface.