JP2703013B2 - Propulsion device for small jet propulsion boat - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a propulsion device for a small jet propulsion boat gliding on the water surface.

[Conventional technology]

Recently, small-sized jet propulsion boats of one or two or three persons, which perform various exercises by sliding on the water surface, have been widely used. This propulsion boat uses a propeller rotating in a channel formed in the bottom of the hull to suck water from the bottom of the boat and jet it backward from the stern through a nozzle at the rear end of the channel. By swinging, the hull is propelled and turned at the same time.

[Problems to be solved by the invention]

In the above configuration, the suction opening of the flow passage is opened at the bottom of the ship, and the rotation of the propeller in the flow passage sucks water from the opening (suction opening) at the bottom of the ship and ejects the water to the rear of the stern. Foreign matter such as seaweed will be sucked together with water,
For this reason, there is a possibility that a foreign substance may be clogged in the suction port or the flow path. In the case where such clogging occurs, it has conventionally been removed manually, but this work is very troublesome.

SUMMARY OF THE INVENTION The present invention has been made in order to solve such a conventional drawback, and an object of the present invention is to provide a propulsion device for a small jet propulsion boat, which can remove clogging of foreign matters very easily. Things.

[Means for solving the problem]

The present invention relates to a small jet propulsion boat gliding on the water surface, wherein an engine is disposed in the hull, a flow path for guiding water from the stern bottom to the stern end is formed in the stern, and the propeller driven by the engine is The drive shaft of the engine and the propeller shaft are connected via a forward / reverse switching mechanism, and the forward / reverse switching mechanism is configured to switch the propeller between a normal rotation state and a reverse rotation state. Is what it is.

[Action]

In the above configuration, the forward / reverse switching mechanism rotates the propeller in the opposite direction to that during normal operation to flow water in the opposite direction, thereby automatically clogging the channel or the suction port. Can be removed.

〔Example〕

In FIG. 1, a hull member 12 constituting a bottom plate and a deck member 11 constituting an upper deck are each integrally formed by FRP, and they are joined to each other at a peripheral edge portion and are substantially sealed therebetween. The space is formed, and the hull 1 is configured. A seat 2 is formed behind the center of the upper deck, an operation handle 3 is provided on the front side, and a front window 30 is provided on the front side.
A back window 20 is provided on the rear side of the vehicle, and a roof 4 is provided between upper ends of the front window 30 and the back window 20.
Are formed.

An engine room 13 is formed in the enclosed space of the hull 1 and an engine 5 is installed. A drive shaft 50 of the engine 5 has a propeller shaft via a forward / reverse switching mechanism 6 and an intermediate shaft 71.
73 are connected. A channel 74 is formed at the bottom of the stern stern, and one end thereof is opened at the bottom of the stern to form a suction port 75, and a nozzle 76 that swings around a vertical axis 76a is attached to the stern end. And in this flow path 74, the propeller shaft
By rotating the propeller 7 provided at the tip of the 73, water is sucked from the suction port 75 and injected through the nozzle 76 in a predetermined direction behind the stern so that the hull 1 is propelled and turned. I have.

The forward / reverse switching mechanism 6 is configured as shown in FIG. That is, a bevel gear 51 is attached to the tip of the drive shaft 50 of the engine 5, and the connecting shaft is perpendicular to the drive shaft 50.
61 is rotatably supported by a bearing 60, and the connecting shaft 61
A pair of bevel gears 63 and 64 are rotatably opposed to each other. The bevel gear 51 meshes with both the bevel gear 63 and the bevel gear 64, thereby transmitting rotational forces in opposite directions to both the bevel gears 63 and 64.

The connection part 63a is provided integrally with the bevel gear 63, the connection part 64a is provided integrally with the bevel gear 64, and the connection part 63a
64a are opposed to each other. Further, a spline portion 62 is formed on a connecting shaft 61 between the bevel gears 63 and 64, and a clutch member 65 is externally fitted to the spline portion 62.
Moves in the axial direction along the spline portion 62, thereby being connected to the connecting portion 63a of the bevel gear 63 or the connecting portion 64a of the bevel gear 64, whereby the rotational force of the bevel gear 63 or the bevel gear 64 causes the clutch member 65 to rotate. The power is transmitted to the connection shaft 61 through the connection shaft 61.

A bevel gear 66 is attached to one end of the connection shaft 61, and a bevel gear 67 attached to a distal end of an intermediate shaft 71 orthogonal to the connection shaft 61 meshes with the bevel gear 66, and the intermediate shaft 71 Is connected to a propeller shaft 73 via a connection flange 72.

In the above configuration, a person on the seat 2 grips the operation handle 3 to drive the engine 5 and sets the forward / reverse switching mechanism 6 to the forward state shown in FIG.
65 is brought into a state of being engaged with the connecting portion 64a of the bevel gear 64. The rotation of the drive shaft 50 of the engine 5 rotates the bevel gears 63 and 64 meshing with the bevel gear 51, and the bevel gear 63 idles around the connection shaft 61. On the other hand, since the bevel gear 64 is connected to the clutch member 65, the rotational force is applied to the connection shaft via the clutch member 65.
61, bevel gear 66, bevel gear 67 and intermediate shaft
Rotational force is transmitted to the propeller shaft 73 via 71. Then, the propeller 7 in the flow path 74 is rotated to suck water from the suction port 75 and jetted in a predetermined direction behind the stern through the nozzle 76 so that the hull 1 is propelled (forward) and turned.

Further, by operating an operating unit (not shown), the clutch member 65 is moved along the spline portion 62 to connect the clutch member 65 to the connecting portion 63a of the bevel gear 63 as shown in FIG. Rotates idle around the connecting shaft 61. On the other hand, the bevel gear 63 rotates in the opposite direction to the bevel gear 64, and the rotational force is transmitted to the connection shaft 61 through the clutch member 65, and is transmitted through the bevel gears 66 and 67 and the intermediate shaft 71 to the propeller shaft 73.
Is transmitted to Therefore, the propeller 7 rotates in the opposite direction. At this time, since the waterline 10 is located above the nozzle 76, water is sucked from the nozzle 76 and sent out to the suction port 75. Therefore, when foreign substances such as seaweed are clogged in the flow path 74 and the suction port 75, they have an effect of discharging them.

〔The invention's effect〕

As described above, according to the present invention, when seaweed or the like is clogged in the flow path, the clogging is automatically performed by reversing the propeller by the reversing mechanism to flow water in the reverse direction in the flow path. It is possible to remove it tediously, so that a complicated removing operation is not required.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view showing an embodiment of the present invention, FIG. 2 is an explanatory plan view of a forward / reverse switching mechanism of the forward / reverse switching mechanism,
FIG. 3 is a view corresponding to FIG. 2 in a reverse rotation state. 1 ... hull, 2 ... seat, 3 ... operation handle, 5 ...
Engine, 6 forward / reverse switching mechanism, 7 propeller,
50: Drive shaft, 61: Connection shaft, 65: Clutch member, 73
... propeller shaft, 74 ... flow path, 75 ... suction port, 76 ... nozzle.

Claims (1)

(57) [Claims] In a small jet propulsion watercraft that glides on the water surface, an engine is disposed in the hull, a flow path for guiding water from the stern bottom to the stern end is formed in a stern part, and a propeller driven by the engine is provided. The drive shaft of the engine and the propeller shaft are connected via a forward / reverse switching mechanism, and the forward / reverse switching mechanism is configured to switch the propeller between a normal rotation state and a reverse rotation state. A propulsion device for a small jet propulsion boat.