JPH06286692A - Propeller of ship - Google Patents

Abstract

PURPOSE:To provide a propeller for a ship which restrains the vibration of an engine from transmission to a hull without improving the rigidity of the hull. CONSTITUTION:A pump housing 61 is formed on the front end with a flange 30 opposed and connected to a flange 32 of an intake part 64 through a mount 34. The mount 34 made of rubber is ring-shaped along the flanges 30, 32 and bellow-shaped axially to be mounted for covering the front and rear surfaces of the flanges 30, 32, while the axial intermediate part of the mount is incorporated to be sandwiched between the flanges 30, 32. While the mount 34 aims mainly at vibration preventing action, it has an enclosing action (sealing property). On the other hand, the rear end of the pump housing 61 is supported on the bottom of a ship through a cylindrical mount unit 46, i.e., a propeller unit 60 is supported on a hull by the mount 34 and cylindrical mount unit 46 between the flanges 30, 32.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mounts a propulsion unit on the rear part of a hull, connects an impeller shaft in a pump housing to a crankshaft of an engine, and rotates the impeller shaft by the driving force of the engine to obtain an intake portion. The present invention relates to a ship propulsion device that injects water sucked in from a nozzle to obtain propulsion.

[0002]

2. Description of the Related Art Conventionally, in a water jet propulsion machine for a small boat, an engine and a propulsion unit are separately provided and mounted on a hull. In this case, since the engine vibrates due to its drive, it is supported by the hull via a vibration-proof mount to suppress vibration to the hull.

Here, a horizontal jet type water jet propulsion machine has been proposed in which the engine and the propulsion unit are integrated (for example, JP-A-2-221293). With such a structure in which the engine and the propulsion unit are integrated, it is easy to mount on the hull, the centering after mounting is simple, and the assembling work becomes easy.

[0004]

However, in the above-mentioned conventional example, although the engine is mounted on the hull via the antivibration mount as in the conventional case, since the propulsion unit is directly attached to the hull, the vibration of the engine does not occur. The problem arises that it is transmitted to the hull via the propulsion unit. In order to solve this, a means of increasing the rigidity of the hull can be considered, but this is not preferable because the number of parts is increased and the weight of the hull is increased to improve the rigidity.

Therefore, an object of the present invention is to provide a marine vessel propulsion device capable of suppressing the transmission of engine vibration to the hull without increasing the rigidity of the hull.

[0006]

In order to achieve the above object, the present invention provides a pump housing having an intake portion for sucking in water and a nozzle portion for injecting water, and an impeller housed in the pump housing. A propulsion unit constituted by an impeller shaft attached to the hull is mounted on the rear part of the hull, the impeller shaft in the pump housing is connected to the crankshaft of the engine, and the impeller shaft is rotated by the driving force of the engine to form an intake part. In a ship propulsion device that obtains propulsive force by injecting water sucked in from a nozzle part, the engine and the propulsion unit are integrated,
In addition, the engine and the propulsion unit are respectively supported on the hull via separate vibration isolation mounts.

[0007]

According to the present invention, the engine and the propulsion unit are integrated with each other, and the engine and the propulsion unit are supported on the hull via separate vibration isolation mounts. Even if it is transmitted,
This vibration can be suppressed by a vibration isolation mount between the propulsion unit and the hull. Therefore, the transmission of vibration to the hull can be suppressed.

[0008]

EXAMPLES Next, examples of the present invention will be described. Figure 1
Shows a small boat to which the present invention is applied.
Is a hull in which a hull (lower hull) 12 and a deck (upper hull) 13 are integrated, and the hull 12 and the deck 13 are made of a reinforced resin such as FRP.
Inside the hull 11, a trunk room 80, a center room 81 and an engine room 82 are provided by partition walls 14 and 15 which are divided into front and rear.

The trunk room 80 is a space having a housing space, the center room 81 houses the fuel tank 40, and the engine room 82 houses the engine 50 and the propulsion unit 60.

A concave cabin 16 is formed on the deck 13. The cabin 16 has an opening 21 at the bottom.
And the control device 23 is attached to the front wall. The opening 21 opens to the center room 81, and is pivotally stopped by a cover member 24 so as to be opened and closed. Control device 2
Reference numeral 3 is configured by attaching a steering handle 25 or the like to the steering post 22, and the steering handle 25 is connected to the propulsion unit 60 or the like by a cable or the like.

In the cabin 16, a driver's seat 26 and a passenger's seat 27 are provided. As shown in FIG. 2, the propulsion unit 60 is configured to rotatably accommodate an impeller 63 fixed to a protruding tip of an impeller shaft 62 in a pump housing 61. The pump housing 61 is composed of a tubular member that gently curves rearward and upward with respect to the traveling direction, and has a flange 30 at the front end. The flange 32 of the intake portion 64 opening to the bottom of the hull 12 faces the flange 30, and the mount 3
They are connected to each other via 4.

As shown in FIG. 3, the mount 34 is made of elastic rubber and has a ring shape along the flanges 30 and 32, and its axial direction has a bellows shape. That is,
The mount 34 is attached so as to cover the front and back surfaces of the flanges 30 and 32, and is also assembled in such a manner that its axially intermediate portion is sandwiched between the flange 30 and the flange 32.

On the flanges 30 and 32 and the clamped mount 34, coaxial female screws 36 are formed, and bolts 38 and 41 are screwed together. The flanges 30 and 32 are connected to each other by screwing the bolts 38 and 41 while holding a part of the mount 34 (the intermediate portion in the axial direction). The mount 34 has a sealing action (sealability) as well as a vibration damping action which is a main purpose.

On the other hand, the rear end of the pump housing 61 is loosely fitted in the through hole 44 of the transom board 42, and the hull 12
Is connected to a nozzle portion 65 that opens at the stern of the. The lower peripheral surface of the rear end portion of the pump housing 61 is supported by the ship bottom via a cylindrical mount unit 46 (rubber bush).

That is, the propulsion unit 60 is stably supported by the hull 11 at two points, the mount 34 between the flanges 30 and 32 and the cylindrical mount unit 46. As shown in FIG. 4, the mount unit 46 is made of elastic rubber, and fixing flanges 90 and 92 are integrally formed at both ends in the longitudinal direction, and screw flanges 94 and 92 are formed in these flanges. And a screw hole 96 is formed. The screw hole 96 is a long hole for adjusting the position with the hull side. The mount unit 46 is fixed to the hull and the propulsion unit by screwing the bolts 98 and 100 into the respective screw holes. As a result, the propulsion unit 60 can be vibration-isolatedly supported on the hull 11.

The propulsion unit 60 has a cylindrical and bellows-shaped seal member 48 attached to the outer wall (stern side) of the transom board 42 to seal the inside and outside of the hull 11 from each other. The seal member 48 is made of rubber and also has a vibration damping effect, so that contact between the pump housing 61 and the peripheral edge of the through hole 44 of the transom board 42 is prevented.

The base portion of the impeller shaft 62 penetrates the curved portion of the pump housing 61, is supported by the bearing unit 49, is further extended, and is spline-coupled to the crankshaft 66 of the engine 50. Therefore, the drive of the engine 50 causes the crankshaft 66 to rotate, whereby the impeller 63 can be rotated via the impeller shaft 62. By rotating the impeller 63,
The propulsion unit 60 sucks water from the intake portion 64 and jets the sucked water from the nozzle portion 65 to obtain a necessary propulsive force.

As shown in FIG. 5, the engine 50 has legs 68 formed obliquely outward from the lower surface thereof, and is supported on the ship bottom via a mount unit 70. A seat 102 for receiving the mount unit is integrally provided on the hull side in a vertically upward direction from the bottom of the ship. Further, at the end of the leg portion 68, a small leg 104 for mounting the mount unit is extended in parallel with the bottom of the ship.

As shown in FIG. 6, the mount unit has a boss portion 106 mounted on the seat 102,
A mount unit body 108 is integrally provided so as to be inclined from the boss portion 106 to the engine side. An end surface of the mount unit main body is parallel to the small leg 104 and serves as a receiving surface 110 capable of receiving the small leg, and the small leg 104 and the mount unit 70 are screwed to the center of the receiving surface. A female screw 103 to which a bolt 112 for screwing is screwed is formed. Also, the boss 1
A screw hole 115 and a female screw 116 are formed in the flange 114 and the seat 102 of 06, and the seat 102 and the mount unit 70 are screwed together by a bolt 118.

These mount units and receiving seats are evenly provided at four places in total in the traveling direction and the width direction, and as a result, the engine 50 is stably supported by the hull 11 via the mount unit 70 in a vibration-proof manner.

A pair of beams 72, which are parallel to each other, project from the rear surface of the engine 50, and the projecting tips of the beams 72 face the upper surface of the curved portion of the propulsion unit 60. The projecting tip surface is curved along the upper surface of the curved portion of the propulsion unit 60, and the engine 50 and the propulsion unit 60 are integrated by being coupled to each other.

A cylindrical portion 74 protruding upward from the pump housing 61 is disposed between the pair of beams 72. On the bottom surface of the cylindrical portion 74, the pump housing 6
A small hole 76 communicating with the inside of the pump housing 1 is provided and is shielded by a transparent member 78, and serves as an inspection window inside the pump housing 61. In addition, it is desirable that the intake portion 64 be provided with a mesh filter for preventing the entry of floating matter such as dust.

Next, the operation of this embodiment will be described. When the engine 50 is started, the rotation of the crankshaft 66 is transmitted to the impeller shaft 62. This impeller shaft 62
The rotation of the rotor rotates the impeller 63, and the propulsion unit 60 sucks water from the intake portion 64 and jets the sucked water from the nozzle portion 65 to obtain a necessary propulsion force.

In the engine 50 and the propulsion unit 60 of this embodiment, since the engine 50 is placed horizontally and integrated, the crankshaft 66 and the impeller shaft 62 can be coaxially connected to each other. The transmission efficiency is good, and the loading operation on the hull 11 is also easy. That is, since the integrated engine 50 and propulsion unit 60 can be loaded at the same time, and the centering work is unnecessary, the assembly work efficiency can be improved.

Here, the propulsion unit 60 is connected to the engine 50.
However, even if the engine portion is vibration-isolated and supported by a rubber bush or the like, the vibration of the engine 50 may be transmitted to the hull 11 via the propulsion unit 60. However, in this embodiment, the engine 50 is supported on the hull 11 via the mount unit 70 and the propulsion unit 60 is supported on the intake portion 64 and the ship bottom via the mount 34 and the mount unit 46. It is possible to suppress the transmission of vibration to the hull 11.

Further, since the mount 34 between the pump housing 61 and the intake portion 64 is constructed so as to cover the flanges 30 and 32, it has a vibration-proof effect and also has a sealing property, so that water leakage and the like can be prevented. You can get rid of your worries.

In this embodiment, the engine 50 is of the horizontal type with respect to the hull 11, but FIG.
The same effect can be obtained even with the vertical type engine 80 as shown in FIG. In this case, the crankshaft 66 and the impeller shaft 62 are bevel gear unit 86.
Therefore, the integrated structure of the engine 80 and the propulsion unit 60 is not damaged. Further, by making the engine 80 vertical, the total length of the integrated engine 80 and propulsion unit 60 can be shortened, the engine room can be reduced, and the cabin portion can be enlarged instead. In terms of effectiveness.

[0028]

As described above, the marine vessel propulsion apparatus according to the present invention has an excellent effect that transmission of engine vibration to the hull can be suppressed without increasing the rigidity of the hull.

[0029]

[Brief description of drawings]

FIG. 1 is a schematic view of a boat to which the present invention is applied.

FIG. 2 is a side sectional view of a water jet propulsion device.

FIG. 3 is an enlarged view showing a connected state of a pump housing and an intake portion.

FIG. 4 is a perspective view of a mount unit that supports a pump housing.

5 is a front view of the water jet propulsion machine of FIG. 2. FIG.

FIG. 6 is a perspective view showing an assembled state of a mount unit of an engine portion.

FIG. 7 is a schematic side view of a small boat (engine vertical installation type) according to another embodiment.

[Explanation of symbols]

 11 Hull 30 Flange (Pump Housing Side) 32 Flange (Intake Part Side) 34 Mount (Propulsion Unit Side) 46 Mount Unit (Propulsion Unit Side) 50 Engine 60 Propulsion Unit 61 Pump Housing 62 Impeller Shaft 63 Impeller 64 Intake Part 65 Nozzle Part 70 Mount unit (engine side)

Claims (1)

[Claims] 1. A propulsion unit including an intake part for sucking in water and a nozzle part for injecting water, and a propulsion unit constituted by an impeller shaft housed in the pump housing and having an impeller attached to the rear part of the hull. A boat equipped with the impeller shaft in the pump housing connected to the crankshaft of the engine, and the impeller shaft is rotated by the driving force of the engine to inject water sucked from the intake part from the nozzle part to obtain propulsion force. A propulsion device in which the engine and the propulsion unit are integrated, and the engine and the propulsion unit are supported on the hull via separate vibration isolation mounts.