JP2003200894A - Water jet propeller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water jet propeller capable of efficiently injecting the water jet and capable of preventing the generation of peeling of a liner. <P>SOLUTION: This water jet propeller 20 can rotate impellers 50 by rotating a drive shaft 16 with an engine 13. With the rotation of the impellers 50, water is sucked through a suction port 25, and the sucked water is sucked into a stator 30, and the water jet is injected backward from a rear end of a stator 30. This water jet propeller 20 is provided with a resin liner 40 in the inner periphery of the stator 30, and the stator 30 is provided with a fitting groove 35 possible to fit on a projection 44 of the liner 40. <P>COPYRIGHT: (C)2003,JPO

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 machine in which an impeller is arranged in a stator, and the impeller is rotated by an engine to inject a water jet from the inside of the stator.

[0002]

2. Description of the Related Art A water jet propulsion machine is provided with a cylindrical stator at the rear of a hull, an impeller is arranged in the stator, and the impeller is rotated by an engine to jet a water jet from the inside of the stator. It promotes the hull. As this water jet propulsion machine, for example, Japanese Patent Laid-Open No. 5-139379 “Water Jet Propulsion Machine” is known. Hereinafter, FIGS. 2 and 3 shown in this publication are reproduced in the following figure (however, the reference numerals are re-assigned)
The water jet propulsion machine will be described in detail.

FIG. 7 is a sectional view of a conventional water jet propulsion machine. The water jet propulsion machine 100 includes an impeller housing 101 (hereinafter referred to as “stator”).
A liner 102 is provided on the inner periphery of the stator 1, an impeller 103 is provided inside the stator 101, and the impeller 103 is connected to an engine (not shown) via a drive shaft 104.

According to this water jet propulsion device 100, water is sucked into the stator 101 from the front of the stator 101 by rotating the impeller 103 by the engine, and the sucked water is jetted backward as a water jet as shown by an arrow. be able to.

FIG. 8 is an exploded perspective view showing a conventional water jet propulsion machine. One end 102a of the liner 102 is shown.
And the other end 102b is separated. When the liner 102 is housed in the stator 101, the liner 102 is elastically deformed by applying a pressing force as indicated by an arrow a, so that the liner 102 has one end 102a and the other end 102b.
And are brought into contact with each other or brought into contact with each other to reduce the diameter of the liner 102. In this state, the liner 102 is inserted into the stator 101 as indicated by the arrow b to release the pressing force on the liner 102. As a result, the liner 102 is expanded in diameter by the elastic force, and the liner 102 can be attached inside the stator 101.

[0006]

However, the liner 10
2, the rear end portion 102c is free. Therefore, when the impeller 103 rotates and pump pressure is generated in the stator 101, the rear end portion 102 of the liner 102 is generated by this pump pressure.
There is a possibility that c will turn inward.

In addition, since the liner 102 mounted in the stator 101 is separated from the one end 102a and the other end 102b, a gap is formed between the one end 102a and the other end 102b. Due to this gap, a dent is formed on the inner circumference of the stator 101, and the distance between the inner circumference of the stator 101 and the impeller 103 (shown in FIG. 7) is partially increased.
Therefore, when the impeller 103 is rotated, the stator 1
It is difficult to efficiently jet a water jet from inside 01.

[0008] Therefore, an object of the present invention is to provide a water jet propulsion device which can prevent the liner from turning inside and can efficiently jet a water jet.

[0009]

In order to achieve the above object, the first aspect of the present invention is to provide a cylindrical stator in the rear part of a boat body, and arrange an impeller in the stator, and to use the impeller in an engine. A water jet propulsion machine for propelling a water hull by injecting a water jet from the inside of a stator to provide a resin liner on the inner circumference of the stator and to fit the end of the liner into the stator. It is characterized by having a groove.

The stator is provided with a fitting groove that can be fitted into the end of the liner. Thereby, the end portion of the liner can be fitted into the fitting groove and supported by the fitting groove. Further, since the liner is a cylindrical body, by providing the liner inside the stator, the inner circumference of the stator can be made the inner circumference surface with high accuracy.

According to a second aspect of the present invention, a metal core material is embedded in the liner.

By embedding a metallic core material in the liner, the rigidity of the liner can be increased. This can prevent the liner from being deformed by the pump pressure when the impeller is rotated.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of the reference numerals. FIG. 1 is a side view of a small boat equipped with a water jet propulsion device (first embodiment) according to the present invention.
The small boat 10 includes a fuel tank 12 on the front portion 11a of the hull 11.
The engine 13 is installed behind the fuel tank 12, and the jet propulsion chamber 14 is installed behind the engine 13.
The water jet propulsion machine 20 is provided in the jet propulsion machine room 14 and on the stern 11b, the steering nozzle 21 is provided behind the water jet propulsion machine 20, and the steering handle 22 for operating the steering nozzle 21 is used as a fuel. A seat 23 is provided above the tank 12 and behind the steering handle 22.

FIG. 2 is a sectional view showing a water jet propulsion machine according to the present invention (first embodiment). The water jet propulsion device 20 has a suction port 25 opened in the boat bottom 15 (shown in FIG. 1) of the hull 11, and extends this suction port 25 to the jet propulsion chamber 14 to form a wall portion 14 a of the jet propulsion chamber 14. First and second bases 26 and 27 are attached to the first and second bases 26 and 27, and a cylindrical stator 30 is provided on the first and second bases 26 and 27. The impeller 50 is arranged in the stator 30. Drive shaft 16 on spline 51
Of the drive shaft 16 is connected to the engine 13 (not shown), and the female screw 52 of the impeller 50 is connected to the support shaft 54.
This support shaft 54 is screwed to the male screw 55 of
Through the bearings 56, 56 to the bearing 3 of the stator 30.
6 is rotatably equipped. A rubber material 58 is arranged between the spline 17 of the drive shaft 16 and the male screw 55 of the support shaft 54.

The bearing 36 is fixed to the rear end portion of the stator 30 via a plurality of stays 37, and the plurality of stays 37 are
It is a member that extends radially from the bearing 36 to the tubular portion of the stator 30.

Further, the water jet propulsion machine 20 is
A resin liner 40 is provided on the inner circumference of the stator 30, and a fitting groove 35 into which the end of the liner 40 (protrusion 44 formed at the rear end 43) can be fitted to the stator 30.

According to the water jet propulsion device 20,
The impeller 50 can be rotated by rotating the drive shaft 16 with the engine 13. Impeller 5
When 0 rotates, water is sucked from the suction port 25 as indicated by an arrow, and the sucked water is sucked into the stator 30,
A water jet is jetted rearward from the rear end of the stator 30 as indicated by an arrow. By jetting a water jet backward from the rear end of the stator 30, the small boat 10 (shown in FIG. 1) can be propelled.

FIG. 3 is an exploded view showing a water jet propulsion machine according to the present invention (first embodiment). A fitting groove 35 is formed in the center of the inner circumference of a stator 30 which constitutes the water jet propulsion machine 20. , The liner 40 is inserted into the stator 30 from the front end side of the stator 30 as shown by the arrow, and the protrusion 44 of the liner 40 is fitted into the fitting groove 35.
Attach the seal 57 to the rear end of the drive shaft 16,
The spline 17 of the impeller 50 is meshed with the spline 17 at the rear of the seal as shown by an arrow to spline-connect the spline 17 and the spline 51. Show.

FIG. 4 is an enlarged view of the essential parts of the water jet propulsion device (first embodiment) according to the present invention. Stator 3
0 indicates the inner peripheral first half 31 and the inner peripheral rear half 32 (see also FIG. 3)
The inner peripheral end front half portion 31 and the inner peripheral rear half portion 32 are formed to have a larger diameter and have a larger diameter portion 33 at the front end portion than the inner peripheral front half portion 31.
A step portion 34 is provided on the boundary between the step portion 34 and
It is a cylindrical body provided with.

The liner 40 has a flange 41 at the front end thereof, an annular lip 42, an annular protrusion 44 at the rear end 43, and an end face 44a of the protrusion 44 formed into a resin cylinder. Is. End face 4 of protrusion 44
By forming the taper 4a, the liner 40 can be easily press-fitted into the inner peripheral front half 31 of the stator 30.

A liner 40 is attached to the enlarged diameter portion 33 of the stator 30.
The flange 41 and the annular lip 42 can be housed, and the contact portion 42 a of the annular lip 42 can be pressed against the first base 26. This makes it possible to satisfactorily seal the gap between the first base 26 and the stator 30.

Here, in a conventional liner, the annular lip does not have a flange. For this reason, in order to seal the gap between the first base and the stator, an annular groove is formed at the front end of the stator, an O ring is arranged in this annular groove, and the O ring is pressed against the first base. Therefore, it is necessary to seal the gap between the first base and the stator. Therefore,
Since the O-ring can be omitted by using the liner, the number of parts can be reduced.

Further, the annular projection 44 of the liner 40 can be fitted into the annular groove 35 of the stator 30. By fitting the protrusion 44 of the liner 40 into the fitting groove 35, the protrusion 44 of the liner 40 can be supported by the locking wall 34a. The locking wall 34a is a wall portion for forming the fitting groove 35.

By thus supporting the protrusion 44 of the liner 40 with the locking wall 34a, even if a pump pressure is generated in the stator 30 due to the rotation of the impeller 50 (shown in FIG. 3), the end portion of the liner 40 is prevented. Part 43 (including protrusion 44)
Can be prevented from turning inside.

According to the present invention, since the liner 40 can be inserted into the stator 30, even if the inner circumference of the liner 40 is worn by the rotation of the impeller 50, the liner 40 can be removed from the stator 30. It can be easily removed and replaced with a new liner 40.

Since the liner 40 is a cylinder, the liner 40 is provided inside the stator 30 so that the stator 3
The inner circumference of 0 can be used as a highly accurate inner circumference. Therefore, when the impeller 50 is rotated, the pump pressure of the water jet propulsion device can be efficiently generated.

Next, second to third embodiments will be described with reference to FIGS. In addition, in 2nd-3rd embodiment, in the case of the same member as 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted. FIG. 5 is an enlarged view of the essential parts of the water jet propulsion device (second embodiment) according to the present invention. The water jet propulsion device 60 of the second embodiment is provided with a liner 61 instead of the liner 40 of the first embodiment, and other configurations are the same as the water jet propulsion device 20 of the first embodiment. .

The liner 61 is a resin liner body 6
2 is different from the liner 40 of the first embodiment in that a metal core material 63 is embedded in the second member 2, and the other configurations are the same as those of the liner 40. Like the liner 40 of the first embodiment, the liner body 62 includes a flange 41 at the front end and an annular lip 42, and an annular protrusion 44 at the rear end 43, and an end surface 44a of the protrusion 44 is tapered. It is a resin-made tubular body formed in a shape of a circle. The core material 63 is a tubular body extending from the front end portion to the rear end portion of the liner body 62, and is embedded in the peripheral wall of the liner body 62.

According to the water jet propulsion device 60 of the second embodiment, the same effect as the water jet propulsion device 20 of the first embodiment can be obtained. In addition, the second
According to the water jet propulsion device 60 of the embodiment, the rigidity of the liner 61 can be increased by embedding the core material 63 in the liner 61. As a result, the liner 61 can be prevented from being deformed when the impeller 50 is rotated, so that the inner peripheral surface of the liner 61 can be maintained with high accuracy, and the water jet propulsion device 60 can be maintained.
It is possible to keep the pump performance of.

FIG. 6 is an enlarged view of a main part of a water jet propulsion device (third embodiment) according to the present invention. The water jet propulsion machine 70 of the third embodiment is provided with a liner 71 instead of the liner 40 of the second embodiment, and other configurations are the same as the water jet propulsion machine 20 of the first embodiment. .

The liner 71 is a liner body 7 made of resin.
2 is different from the liner 40 of the first embodiment in that the metal core materials 73, 73, 73 are embedded in the front portion 72a, the central portion 72b and the rear portion 72c, respectively, and other configurations are the same as the liner 40. Is.

Like the liner 40 of the first embodiment, the liner body 72 has a flange 41 at the front end and an annular lip 42, and an annular projection 4 at the rear end 43.
4 is a resin cylindrical body in which the end surface 44a of the projection 44 is formed in a tapered shape. The core material 73 is the liner body 7
The length of the liner body 72 is set to about 1/3 of the length of 2
By embedding in the front portion 72a, the central portion 72b, and the rear portion 72c, the entire peripheral wall of the liner body 72 is provided.

According to the water jet propulsion machine 60 of the third embodiment, the same effect as that of the water jet propulsion machine 20 of the first embodiment can be obtained. In addition, the second
According to the water jet propulsion device 60 of the embodiment, the front portion 72a, the central portion 72b, and the rear portion 72c of the liner 71.
The rigidity of the liner 71 can be increased by embedding the core materials 73, 73, 73 in the respective. As a result, the liner 71 can be prevented from being deformed when the impeller 50 is rotated, so that the inner peripheral surface of the liner 71 can be maintained with high accuracy, and the pump performance of the water jet propulsion device 70 is favorable. Can be kept at

Further, according to the water jet propulsion machine 60 of the second embodiment, the core members 73, 73, 7 are divided into the front portion 72a, the central portion 72b and the rear portion 72c of the liner 71.
By embedding 3, the core material 73, for example, the liner 7
When the insert molding for embedding in 1 is performed, the resin can be efficiently filled in the cavity, so that the liner 71 can be molded in a relatively short time.

In the above embodiment, the liner 40,
Although an example in which the protrusion 44 is formed on the rear end portion 43 of 61, 71 and the protrusion 44 is fitted into the fitting groove 35 of the stator 30 has been described, the present invention is not limited to this, and the liners 40, 61,
A protrusion is formed on the front end portion of the stator 71, and the protrusion is attached to the stator 30.
It is also possible to be configured to fit in the fitting groove of.
Further, in the third embodiment, an example in which the three core members 73 are embedded in the liner 71 has been described, but the present invention is not limited to this, and for example, two or three core members 73 may be embedded in the liner 71. It is possible.

[0036]

The present invention has the following effects due to the above configuration. According to the first aspect, the stator is provided with the fitting groove that can be fitted into the end portion of the liner. Thereby, the end portion of the liner can be fitted into the fitting groove and supported by the fitting groove. Therefore, even if the pump pressure is generated by the rotation of the impeller,
You can prevent the end of the liner from turning inside.

Further, since the liner is a cylindrical body, by providing the liner in the stator, the inner circumference of the stator can be made the inner circumference surface with high accuracy. Therefore, the pump pressure of the water jet propulsion device can be efficiently generated when the impeller is rotated.

According to the second aspect, the rigidity of the liner can be enhanced by embedding a metal core material in the liner. As a result, the liner can be prevented from being deformed when the impeller is rotated, so that the inner peripheral surface of the liner can be maintained with high accuracy, and the pump performance of the water jet propulsion machine can be maintained at a suitable level. it can.

[Brief description of drawings]

FIG. 1 is a water jet propulsion device according to the present invention (first
Side view of a small boat equipped with the embodiment)

FIG. 2 is a water jet propulsion device according to the present invention (first
Embodiment))

FIG. 3 is a water jet propulsion device according to the present invention (first
(Embodiment) Exploded view

FIG. 4 is a water jet propulsion device according to the present invention (first
Enlarged view of the main part of the embodiment)

FIG. 5 is a water jet propulsion device according to the present invention (second
Enlarged view of the main part of the embodiment)

FIG. 6 is a water jet propulsion device (third embodiment) according to the present invention.
Enlarged view of essential parts of the embodiment)

FIG. 7 is a sectional view of a conventional water jet propulsion machine.

FIG. 8 is an exploded perspective view showing a conventional water jet propulsion device.

[Explanation of symbols]

10 ... Small boat, 11 ... Hull, 13 ... Engine, 20,6
0, 70 ... Water jet propulsion machine, 30 ... Stator, 35 ... Fitting groove, 40, 61, 71 ... Liner, 43
... rear end (end) of liner, 50 ... impeller, 63,
73 ... Core material.

Claims (2)

[Claims] 1. A cylindrical stator is provided at the rear of the hull,
A water jet propulsion device in which an impeller is arranged in the stator, and the impeller is rotated by an engine to inject a water jet from the inside of the stator to propel a boat body, wherein a resin liner is provided on an inner circumference of the stator. At the same time, the water jet propulsion machine is characterized in that the stator is provided with a fitting groove into which the end portion of the liner can be fitted. 2. The water jet propulsion device according to claim 1, wherein a metal core material is embedded in the liner.