JPH072394Y2 - Idling propeller mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a structure for mounting a free-running propeller, and more particularly to a free-running propeller that generates auxiliary thrust by being rotationally driven by the wake of a screw propeller. The present invention relates to a mounting structure for a rotary propeller.

[Prior Art] Generally, as a device that contributes to the improvement of propulsion efficiency of a ship,
An idle propeller provided behind a propulsion device is known.

As shown in FIG. 4, conventionally, this type of idler propeller 1 is
Behind the screw propeller 3 provided at the stern of the hull 2,
They are arranged side by side on the same axis. The idler propeller 1 has a blade 5 having a diameter slightly larger than that of the blade 4 of the screw propeller 3, the blade surface located in the wake F is formed in a turbine blade shape, and the blade 5 is formed. The tip blade surface radially outward of the surface is formed with a normal propeller pitch. That is, the entire turbine blade-shaped portion receives the wake F and is rotationally driven, and an auxiliary thrust force is generated at the tip portion thereof.

Further, behind the idler propeller 1, a ladder 6 positioned so as to face the wake F is rotatably provided on a ladder horn 7 suspended from the hull 2. That is, the turning angle of the ladder 6 is adjusted to appropriately control the traveling direction of the hull 2.

As shown in FIG. 5, the attachment structure of the idling propeller 1 includes a stub shaft 8 forming a shaft portion of the idling propeller 1.
Is fastened to the rear end 10 of the boss portion 9 of the propulsion device 3 by a mounting bolt 11 extending in the axial direction. The stub shaft 8 is a boss that supports the blade 5 of the idler propeller 1.
12 is rotatably supported via a bearing member 13.

A lubricating space 14 is defined between the stub shaft 8 and the boss portion 12 for accommodating the bearing member 13 and allowing lubricating oil to flow therethrough. At the rear end 15 of the boss portion 12, the lubrication space 14
An end cover 16 for sealing the is attached by a bolt 17. A lubricating oil supply pipe 18 extended into the stub shaft 8 through the inside of a propeller shaft (not shown) and the propeller boss portion 9 is connected to the lubricating space 14. Lubricating oil is supplied to the bearing member 13 via the bearing.

[Problems to be Solved by the Invention] By the way, as shown in FIG. 5, the conventional structure for attaching the idler propeller 1 is such that a female screw is drilled on the rear end 10 of the boss portion 9 of the propulsion device 3, and The mounting bolt 11 was screwed together. Therefore, once the female screw is damaged, it cannot be repaired, and there is a problem that the entire propulsion device 3, which is a main component, must be replaced.

Further, the effective length of the mounting bolt 11 can be set substantially only to the thickness of the flange portion of the stub shaft 8 joined to the surface of the rear end 10. That is, it was insufficient to function as a stretch bolt. In other words, this mounting bolt
11 has a problem that it is not possible to generate a predetermined axial force sufficient to support the idling propeller 1 to which a large external force is applied in the axial direction.

On the other hand, the applicant of the present invention previously found that the rudder horn 7 of the idle propeller 1
Have proposed a configuration that is supported by (Japanese Patent Application No. 62-155414).
issue). With this configuration, weight support of the idler propeller to the propeller shaft system is eliminated, rotation of the idler propeller and propeller shaft system is prevented, and the idler propeller has the same wake direction and mounting direction. Prevention of falling off and simplification of the structure by the equipment of the lubricating oil supply system to the rudder horn were achieved, and improvements were made in the mounting arrangement structure of the idler propeller as a whole.

However, in this proposal, the details of the mounting structure were not mentioned, and the above problems were not solved.

Therefore, in view of the above circumstances, the present invention was devised to provide an attachment structure for a free-moving propeller that is easy to maintain and has improved attachment force (axial force).

[Means for Solving the Problems] The present invention provides a structure for mounting a free-running propeller, which is supported by the front end of a ladder horn provided at the rear of the propulsion device and is rotated by the backflow of the propulsion device. A first flange member, which has a predetermined thickness and is projected outward in the radial direction, and a rear end of a shaft portion which supports the boss portion of the idler propeller through a bearing member. A second flange member that has a predetermined thickness and is bulged outward in the radial direction, and a through bolt that penetrates the peripheral end portions of both flange members, and is screwed into the through bolt to join both flange members together. Nut, an oil injection hole formed in the shaft portion for forcibly circulating the lubricating oil of the bearing member and an oil discharge hole, and an oil injection hole and oil provided in a hollow chamber defined inside the holding body. An oil injection pipe and an oil discharge pipe respectively connected to the discharge holes are provided. Of.

[Operation] With the above configuration, the idling propeller is located behind the propulsion device and rotationally driven by the wake of the propeller to generate an auxiliary propulsion force. The through bolt cooperates with the nut to firmly attach the idler propeller to the rudder horn, and has a length corresponding to the thickness of both flange members to generate an axial force that resists the external force and the own weight of the idler propeller. To do. The lubricating oil lubricates the bearing member from the oil injection pipe on the ladder horn side through the oil injection hole, and is then discharged from the oil discharge hole to the ladder horn side through the oil discharge pipe.

[Embodiment] An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an embodiment of a structure for attaching a free-moving propeller according to the present invention. The same components as those of the conventional one are designated by the same reference numerals, and the description thereof will be omitted.

The idler propeller 1 is supported by a ladder horn 7 and is positioned behind the propulsion device 3, and also has a front end portion 21 of the ladder horn 7 and a stub shaft 8 that is a shaft portion of the idler propeller 1, respectively. The first flange member 22 and the second flange member 23 are provided, and are fastened to the ladder horn 7 by being fastened by the through bolts 24 penetrating the flange members 22 and 23.

The front end portion 21 of the rudder horn 7 projects toward the upstream of the wake F at the position of the rotation axis A of the propulsion device 3 and holds the flange surface 25 of the first flange member 22 substantially vertically. . In this embodiment, the bulging portion of the front end portion 21 is integrally molded with the first flange member 22 to form a flange holder 26 having a short columnar shape and concentric with the rotation axis A. ing.

As shown in FIG. 2, the rear end 27 of the stub shaft 8 is extended in the same manner as the front end 21 of the ladder horn 7, and
The second flange member 23 joined to the first flange member 22 on the side is integrally supported. A plurality of penetrating bolts 24 extending in the direction of the axis A are provided at the peripheral ends of the flange members 22 and 23.

As shown in FIG. 3, the through bolt 24 is adapted to be inserted into the through hole 28 formed in the flange members 22 and 23 from the stub shaft 8 side, and the tip end portion protruding toward the ladder horn 7 side. However, it is adapted to be screwed into the nut 29. That is, the effective shaft length L as the extension bolt of the through bolt 24 is the member thickness g of the first flange member 22 on the ladder horn 7 side and the member thickness h of the second flange member 23 of the stub shaft 8. It is the total length of. However, in the present embodiment, the member thickness h on the stub shaft 8 side is substantially shorter by the depth of the notch 31 that accommodates the bolt head 30 of the through bolt 24. Also, the shaft diameter D of the through bolt 24
Are formed so as to obtain a predetermined torque and strength and are slightly smaller than the through hole 28. The ratio (L / D) between the shaft length L and the shaft diameter D related to the axial force is about 6.0 in this embodiment.

The male thread portion of the through bolt 24 has a peak diameter larger than the shaft diameter D and a root diameter substantially the same as the shaft diameter D to generate a high axial force.

In addition to this, as shown in FIG. 2, a hollow chamber 32 is formed in the axial center portion of the flange holder 26 through which the lubricating oil supply / discharge passages 41, 42 of the hull are drawn via the ladder horn 7.
An oil injection pipe 33 and an oil discharge pipe 34, which communicate with the lubricating space 14, are provided in the hollow chamber 32 integrally with a cover plate 43 that shuts off the ladder horn 7 side and the idler propeller 1 side. Of these, the oil injection pipe 33 is connected to an oil injection hole 35 formed up to its front end along the substantial axis of the stub shaft 8, and the oil discharge pipe 34 is
It is connected to an oil discharge hole 36 formed by bending the stub shaft 8 in the radial direction from the axial direction. That is, the lubricating oil is supplied to the bearing member 13 by forming an oil circulation path through the bearing member 13 provided in the lubricating space 14.

Further, an oil supply pipe 37 is provided in parallel with the pipes 33, 34, and the lubricating oil is supplied to a seal device 38 for sealing the rear end side of the boss portion 12 of the idler propeller 1. .

Further, in this embodiment, a rotation detector 39 for detecting the rotation of the idler propeller 1 is provided at the front end of the stub shaft 8. The rotation detector 39 is slightly deviated from the axis A, and is located so as to face a detected body 40 attached to the inner wall of the end cover 16 which is rotated integrally with the blade 4. The rotation detector 39 is connected to a cable 42 extended to a cable guide hole 41 formed in the stub shaft 8 and is connected to a rotation indicator (not shown) provided on the base end side thereof. The rotation information of the idle propeller 1 is transmitted.

Next, the operation of this embodiment will be described.

The idler propeller 1 is rotationally driven by the wake F of the propulsion device 3 to generate auxiliary thrust. Further, by being supported by the ladder horn 7, the weight support for the propeller shaft system for driving the propulsion device 3 is eliminated, and the rotation together with the propeller shaft system is prevented.

The through bolt 24 exerts a high fastening force (axial force) when the nut 29 to be screwed is rotated to firmly attach the flange members 22 and 23. That is, the idling propeller 1 is securely attached to the ladder horn 7. Here, in the tightening bolt, the larger the ratio (L / D) between the shaft length L and the shaft diameter D, the smaller the stress generated in the bolt member. In other words, even if the bolts have the same diameter, if the shaft length L can be made large, a larger tightening force can be obtained. Therefore, since the through bolt 24 has a large value of L / D≈6.0, it exerts a larger fastening force than the conventional one.

Further, the rotation detector 39 detects the rotation of the end cover 16 and the blade 5 by sensing the passage of the detected object 40, and can grasp the driving rotation state of the idler propeller 1.

In this way, the front end 21 of the rudder horn 7 and the idling propeller 1
Since the flange members 22 and 23 are provided on the stub shaft 8 and are fastened by the through bolts 24, the effective axial length L of the through bolt 24 corresponding to the member thickness of the flange members 22 and 23 can be obtained. Therefore, it is possible to obtain a larger axial force than in the past and to provide a durable attachment structure. That is, since it is not necessary to form a female screw on the propulsion device 3 or the ladder horn 7, the tightening force is insufficient, and it is not necessary to replace the main member when it is damaged. Further, the through bolt 24 and the nut 29 are made of a material having a large yield strength, so that the fastening force and the durability can be further improved.

Further, since the ladder horn 7 and the idler propeller 1 can be manufactured separately, the manufacturing workability is good, and the mounting structure and main constituent members can be easily maintained. That is, even if the through bolt 24 or the nut 29 is damaged, it can be dealt with only by replacing them.

Further, as shown in this embodiment, even if the hollow chamber 32 is provided in the flange member 22, the mounting structure is not adversely affected, so that the lubricating oil supply system (the oil injection pipe 33 and the oil discharge pipe 34) and the rotation are prevented. The detector 39 can be provided at an appropriate position, and the structure of piping and wiring can be simplified.

That is, it is possible to contribute to maintenance of normal operation of the idler propeller 1 and improvement of durability.

In addition, between the joint surfaces of the flange members 23 and 24 and the cover plate 4
Naturally, it is desirable to provide highly rigid packing on the joint surface of 3.

[Effects of the Invention] In short, according to the present invention, the following excellent effects are exhibited.

The flange member at the front end of the rudder horn and the flange member at the shaft of the idler propeller are fastened with through bolts and nuts, and the oil injection hole and oil discharge hole in the shaft and the oil injection pipe and oil discharge pipe in the holder are Since the bearing member of the shaft portion is lubricated, the bolt axial force for mounting can be increased, the mounting force and maintainability are improved, and the lubricating oil is forcedly circulated. It can contribute to maintaining normal operation of the idler propeller and improving durability.

[Brief description of drawings]

FIG. 1 is a side view showing a mounting structure of an idler propeller according to the present invention, FIG. 2 is an enlarged sectional view of a II portion of FIG. 1, FIG. 3 is an enlarged view of a III portion of FIG. 2, and FIG. Is a side view showing a conventional idler propeller, and FIG. 5 is a partially cutaway side view showing its mounting structure. In the figure, 1 is a free-running propeller, 3 is a propeller, 7 is a rudder horn, 8 is a stub shaft which is a shaft portion of the free-running propeller, 12 is a boss portion of the free-running propeller, 13 is a bearing member, and 21 is a front end of the rudder horn. , 22 is a first flange member, 23 is a second flange member, 24 is a through bolt, 26 is a flange holder as a holder,
29 is a nut, 32 is a hollow chamber, 33 is an oil injection pipe, 34 is an oil discharge pipe, 35 is an oil injection hole, and 36 is an oil discharge hole.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Toyonobu Narita 3-15 Toyosu, Koto-ku, Tokyo Ishikawajima Harima Heavy Industries Ltd. Tokyo Second Factory (72) Inventor Akira Guri 1-3, Higashisugano, Ichikawa-shi, Chiba No. 23-401 (56) Reference JP-A 64-1690 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. A mounting structure for a free-running propeller, which is supported by a front end of a rudder horn provided at the rear of a propulsion device and is rotated by a backflow of the propulsion device, wherein a holding body is projected forward of the front end part. A first flange member which has a predetermined thickness and is projected outward in the radial direction, and a predetermined thickness at the rear end of the shaft portion which supports the boss portion of the idler propeller through a bearing member are provided. A second flange member having a radially outward projection, a through bolt penetrating the peripheral end portions of the two flange members, and a nut screwed to the through bolt to join the two flange members together, An oil injection hole and an oil discharge hole formed in the shaft portion for forcibly circulating the lubricating oil of the bearing member, and an oil injection hole and an oil provided in a hollow chamber defined inside the holding body. Equipped with oil injection pipe and oil discharge pipe respectively connected to the discharge holes Mounting structure idler propeller, characterized in that.