JP6706560B2 - Marine propeller - Google Patents

Description

TECHNICAL FIELD The present invention relates to an assembled marine propeller.

One of the marine propellers is a fixed pitch propeller in which a plurality of propeller blades and a propeller boss are integrated. In such a fixed pitch propeller, the pitch (angle) of the propeller blades cannot be adjusted. Therefore, an assembly-type marine propeller in which a plurality of propeller blades and a propeller boss are separated may be used.

For example, Patent Document 1 discloses an assembled marine propeller 100 as shown in FIGS. 12(a) and 12(b). In this marine propeller 100, a blade flange 121 of a propeller blade 120 is fastened to a hollow propeller boss 110 with a stud bolt 130 and a tension nut 140. Specifically, the propeller boss 110 is provided with a plurality of openings 111 through which the studs 130 are inserted. Each opening 111 extends in the circumferential direction around the center of the blade flange 121, and the pitch of the propeller blades 120 can be adjusted by the length of the opening 111.

A washer 150 is interposed between the tension nut 140 that is screwed into the stud bolt 130 and the propeller boss 110. Further, the tension nut 140 is pulled in the direction away from the washer 150 by the plurality of tension screws 160, and thereby the stud bolt 130 is tensioned.

Special table 2002-544063 gazette

In the marine propeller 100 shown in FIGS. 12A and 12B, a plurality of (for example, 16) studs 130 are required for one propeller blade, and the studs 130 are provided for each stud 130. Multiple (eg, 16) tension screws 160 are required. Therefore, the work of attaching the propeller blades to the propeller boss is complicated.

On the other hand, there are also assembly-type marine propellers in which the work of attaching the propeller blades to the propeller boss is simpler. In this marine propeller, a disc is arranged in a propeller boss. The disk contacts the blade flange through a blade fixing hole provided in the propeller boss, and is fastened to the blade flange by a bolt to clamp the propeller boss together with the blade flange.

The vane flange and the propeller boss are connected by at least one pin. Specifically, the blade flange is provided with a positioning hole into which the pin fits. On the other hand, the propeller boss is provided with an adjusting hole, and a bush having a fitting hole for fitting with a pin is inserted into the adjusting hole. By processing the bush so that the center of the fitting hole is displaced from the center of the bush, the pitch of the propeller blades can be adjusted.

In such a marine propeller, when changing the pitch of the propeller blades, it is necessary to remove the propeller blades from the propeller boss and replace the bush. To remove the propeller blades from the propeller boss, first remove the bolts that fasten the disc to the blade flange, and then use a crane or the like to transfer the propeller blades from the propeller boss. However, it is desirable to avoid the propeller blade transfer work using a crane or the like as much as possible.

Therefore, an object of the present invention is to provide an assembly-type marine propeller in which the pitch of propeller blades can be easily changed.

In order to solve the above-mentioned problems, a marine propeller of the present invention is a propeller blade including a blade flange, a hollow propeller boss provided with a blade fixing hole, and a disk that abuts the blade flange through the blade fixing hole. A disc that has a through hole that is inserted into the fastening member, is fastened to the blade flange by the fastening member, and holds the propeller boss with the blade flange, and is held by one of the propeller boss and the disc. At least one pin, and a bush inserted into an adjustment hole provided in the other of the propeller boss and the disc, the bush having a fitting hole that fits the pin, the through hole of the disc It is an elongated hole extending in the circumferential direction around the center of the blade flange.

According to the above configuration, when changing the pitch of the propeller blades, the bush can be replaced by removing the fastening member that fastens the disc to the vane flange and removing the disc from the propeller boss. That is, it is not necessary to remove the propeller blades from the propeller boss. Therefore, the pitch of the propeller blades can be easily changed. Further, since the through hole of the disk inserted into the fastening member is an elongated hole, a larger pitch adjustment range of the propeller blades can be secured.

The adjustment hole may be an elongated hole extending in the circumferential direction around the center of the blade flange. With this configuration, it is possible to secure a larger adjustment range of the pitch of the propeller blades.

For example, the pin may be retained in the propeller boss or the disc by mating with a positioning hole provided in the propeller boss or the disc.

The disk may have an elliptical shape that is long in the axial direction of the propeller shaft, and the pin may be arranged at a position separated from the blade fixing hole in the axial direction of the propeller shaft. With this configuration, the propeller boss can be downsized even when the number of propeller blades is large.

According to the present invention, the pitch of the propeller blades can be easily changed.

It is a perspective view showing a marine propeller concerning a 1st embodiment of the present invention. It is sectional drawing of the marine propeller shown in FIG. FIG. 3 is a sectional view taken along line III-III in FIG. 2. 2A is an enlarged view of a main part of FIG. 2, FIG. 2B is a sectional view taken along line IV-IV of FIG. 2A, and FIG. 3C is a bottom view corresponding to FIG. It is a bottom view showing other shapes of an adjustment hole and a bush. (A) And (b) is a partial cross section figure of the propeller for ships of a modification. (A) And (b) is a partial cross section figure of the propeller for ships of a modification. (A) is a partial sectional view of a marine propeller according to a second embodiment of the present invention, (b) is a sectional view taken along line VIIIB-VIIIB of (a), (c) is VIIIC- of (b). It is sectional drawing which followed the VIIIC line. (A) And (b) is a partial cross section figure of the propeller for ships of a modification. (A) And (b) is a partial cross section figure of the propeller for ships of a modification. It is a partial cross section figure of the propeller for ships of a modification. (A) is a partial sectional view of a conventional marine propeller, and (b) is a sectional view taken along line XII-XII of (a).

(First embodiment)
1 to 3 show a marine propeller 1 according to a first embodiment of the present invention. This marine propeller 1 is an assembly type in which a plurality of propeller blades 3 and a propeller boss 2 are separate bodies. In the present embodiment, the number of propeller blades 3 is four, but the number of propeller blades 3 may be three or less, or may be five or more.

The propeller boss 2 is hollow. In the present embodiment, the propeller boss 2 has a tubular shape extending in the axial direction of the propeller shaft 11. One end of the propeller boss 2 is fixed to a flange 12 provided at the tip of the propeller shaft 11 by a plurality of bolts 13. The cover 14 is fixed to the other end of the propeller boss 2 by a plurality of unillustrated bolts. The cover 14 closes the internal space of the propeller boss 2 from the side opposite to the propeller shaft 11.

The propeller boss 2 is provided with a plurality of blade fixing holes 21 that penetrate the propeller boss 2 in the radial direction. In the present embodiment, the outer portion (portion near the outer peripheral surface of the propeller boss 2) of each blade fixing hole 21 has a large diameter, and the inner portion (portion near the inner peripheral surface of the propeller boss 2) has a small diameter. In other words, an annular protrusion protruding inward in the radial direction of the blade fixing hole 21 is formed in the inner portion of each blade fixing hole 21.

Each propeller blade 3 includes a blade flange 31 for connection with the propeller boss 2. In this embodiment, the blade flange 31 has a stepped shape that matches the shape of the blade fixing hole 21, and the entire blade flange 31 is inserted into the blade fixing hole 21. That is, the front surface of the blade flange 31 (the surface located on the radially outer side of the propeller boss 2) forms a wall surface continuous with the outer peripheral surface of the propeller boss 2.

A plurality of (eight in the illustrated example) screw holes 32 that are screwed into bolts 41 to be described later are formed on the back surface of the blade flange 31 (the surface located inside the propeller boss 2 in the radial direction). In the illustrated example, the screw holes 32 are arranged at equal angular intervals around the center of the blade flange 31, but the intervals between the screw holes 32 do not have to be equal.

In the propeller boss 2, as many disks 4 as the propeller blades 3 are arranged. Each disk 4 is larger than the inner opening of the blade fixing hole 21 and is in contact with the blade flange 31 through the blade fixing hole 21. In this embodiment, each disk 4 has an elliptical shape that is long in the axial direction of the propeller shaft 11. However, the shape of each disk 4 may be circular.

Each disk 4 is fastened to the blade flange 31 by a plurality of bolts 41 (corresponding to a fastening member of the present invention) extending in the axial direction of the blade fixing hole 21. The bolt 41 penetrates the disc 4 from the inside of the propeller boss 2 and is screwed into the screw hole 32. That is, the disk 4 has the through hole 42 that is inserted into the bolt 41. The disk 4 holds the propeller boss 2 (more precisely, the annular projection formed in the inner portion of the above-mentioned blade fixing hole 21) together with the blade flange 31 by being fastened to the blade flange 31 with the bolt 41. The through hole 42 is an elongated hole that extends in the circumferential direction around the center of the blade flange 31.

The propeller boss 2 and the disk 4 are connected by a plurality of (four in the illustrated example) pins 6 extending in the axial direction of the blade fixing hole 21. These pins 6 play a role of stopping the movement of the propeller blade 3 around the axis of the blade fixing hole 21. In the present embodiment, each pin 6 has a columnar shape whose axial length is longer than its diameter. However, the length of each pin 6 may be shorter than the diameter. Alternatively, each pin 6 may be, for example, a rectangular parallelepiped that is long in the axial direction of the blade fixing hole 21 or in the direction orthogonal thereto.

In the present embodiment, the two pins 6 are arranged at positions separated from the blade fixing hole 21 in one axial direction of the propeller shaft 11, and the remaining two pins 6 are arranged in the axial direction of the propeller shaft 11 from the blade fixing hole 21. It is arranged at a position separated from the other. In other words, each pin 6 is located in a region overlapping with the blade fixing hole 21 when viewed from the axial direction of the propeller shaft 11.

As shown in FIGS. 4A to 4C, in this embodiment, each pin 6 is held by the propeller boss 2. Specifically, the propeller boss 2 is provided with a bottomed positioning hole 5, and the pin 6 is held in the propeller boss 2 by being fitted into the positioning hole 5. In this embodiment, the pin 6 is fixed to the propeller boss 2 by a bolt 91 penetrating the center of the pin 6.

On the other hand, the disk 4 is provided with a circular adjustment hole 7 penetrating the disk 4 at a position corresponding to the positioning hole 5, and a bush 8 is inserted into the adjustment hole 7. The bush 8 has a fitting hole 8a into which the pin 6 fits. By processing the bush 8 so that the center of the fitting hole 8a is displaced from the center of the bush 8, the pitch of the propeller blades 3 can be adjusted.

More specifically, the bush 8 has a cylindrical portion 81 having the same length as the thickness of the disc 4 and defining the fitting hole 8a, and an opposite end of the cylindrical portion 81 from the end opposite to the propeller boss 2. It has a pair of flange portions 82 that spreads over. The flange portion 82 is fixed to the disc 4 by the bolt 92.

In the marine propeller 1 configured as described above, when changing the pitch of the propeller blades 3, the bush 8 can be replaced by removing the bolt 41 and removing the disk 4 from the propeller boss 2. That is, it is not necessary to remove the propeller blades 3 from the propeller boss 2. Therefore, the pitch of the propeller blades 3 can be easily changed. Furthermore, since the through hole 42 of the disk 4 which is inserted into the bolt 41 is an elongated hole, a larger pitch adjustment range of the propeller blades 3 can be secured.

Moreover, in the present embodiment, since the disk 4 has an elliptical shape and the pins 6 are arranged on both sides of the blade fixing hole 21 in the axial direction of the propeller shaft 11, even when the number of the propeller blades 3 is large, The boss 2 can be downsized.

<Modification>
In the above embodiment, the blade flange 31 has a stepped shape, but the disk flange 4 has a stepped shape so that it is partially inserted into the blade fixing hole 21, and the blade flange 31 is flat. May be. In this case, the blade fixing hole 21 does not have the annular protrusion, and the blade flange 31 does not have to be inserted into the blade fixing hole 21. This modification can also be applied to the second embodiment described later.

Further, the disk 4 does not necessarily have to directly contact the blade flange 31, but may contact the blade flange 31 indirectly via another member inserted into the blade fixing hole 21. This modification is also applicable to the second embodiment described later.

Moreover, in the said embodiment, the adjustment hole 7 in which the bush 8 is inserted was circular. However, as shown in FIG. 5, the adjustment hole 7 may be an elongated hole that extends in the circumferential direction around the center of the blade flange 31. According to this configuration, the pitch adjustment range of the propeller blades 3 can be further ensured. This modification can also be applied to the second embodiment described later.

Further, the method of fixing the pin 6 and the bush 8 can be appropriately changed. For example, as shown in FIG. 6A, the length of the tubular portion 81 of the bush 8 may be increased, and the flange portion 82 may be located outside the adjustment hole 7. Further, a closing portion 83 may be provided at an end of the tubular portion 81 on the opposite side to the propeller boss 2, and the closing portion 83 may support the pin 6.

Alternatively, as shown in FIG. 6B, the positioning hole 5 provided in the propeller boss 2 may be a screw hole, and the pin 6 may be formed with a screw thread to be screwed into the screw hole.

Alternatively, as shown in FIG. 7A, the flange portion 82 of the bush 8 may be provided at the end of the tubular portion 81 on the propeller boss 2 side. The adjustment hole 7 may be a bottomed hole, and the pin 6 may be supported by the bottom of the adjustment hole 7.

Alternatively, as shown in FIG. 7B, when the adjustment hole 7 penetrates the disc 4, the pin 6 is supported by the closing portion 83 provided at the end of the tubular portion 81 opposite to the propeller boss 2. May be done.

(Second embodiment)
8A to 8C show a part of the marine propeller according to the second embodiment of the present invention. The overall structure of the marine propeller of this embodiment is the same as that of the first embodiment shown in FIGS. 1 to 3. In addition, in this embodiment, the same components as those in the first embodiment are designated by the same reference numerals, and the duplicated description will be omitted.

In this embodiment, each pin 6 is held on the disk 4. Specifically, the disc 4 is provided with a positioning hole 5 penetrating the disc 4, and the pin 6 is held in the disc 4 by being fitted into the positioning hole 5. In the present embodiment, the pin 6 is fixed to the propeller boss 2 by a bolt 93 screwed into a screw hole provided on the side surface of the disk 4. A shaft may be provided at the tip of the bolt 93, and the shaft may penetrate the pin 6.

On the other hand, the propeller boss 2 is provided with a bottomed circular adjustment hole 7 at a position corresponding to the positioning hole 5, and a bush 8 is inserted into the adjustment hole 7. The bush 8 has a fitting hole 8a into which the pin 6 fits. By processing the bush 8 so that the center of the fitting hole 8a is displaced from the center of the bush 8, the pitch of the propeller blades 3 can be adjusted.

More specifically, the bush 8 has the same length as the depth of the adjustment hole 7 and defines a tubular portion 81 that defines the fitting hole 8a and the disk portion 4 side end of the tubular portion 81 that extends in opposite directions. It has a pair of flange portions 82. The flange portion 82 is fixed to the propeller boss 2 by the bolt 92.

Also in this embodiment, the same effect as that of the first embodiment can be obtained.

<Modification>
The method of fixing the pin 6 and the bush 8 can be appropriately changed. For example, as shown in FIG. 9A, the length of the pin 6 may be increased, and the pin 6 may be supported by the support plate 94 fixed to the inner surface of the disk 4 by the bolt 95.

Alternatively, as shown in FIG. 9B, the length of the pin 6 is further increased, and a groove is formed on the peripheral surface of the pin 6, and the groove is fixed to the inner surface of the disk 4 by a bolt 97. The key plate 96 may be engaged.

Alternatively, as shown in FIG. 10A, the positioning hole 5 may be a bottomed hole, and the pin 6 may be supported by the bottom of the positioning hole 5. A closing portion 84 may be provided at the end of the tubular portion 81 opposite to the disc 4.

Alternatively, as shown in FIG. 10B, the positioning hole 5 provided in the disc 4 may be a screw hole, and the pin 6 may be formed with a screw thread to be screwed into the screw hole.

Alternatively, as shown in FIG. 11, the pin 6 may be held on the disc 4 by being integrally formed on the disc 4. When the pin 6 is held by the propeller boss 2 as in the first embodiment, the manufacturing cost of the propeller boss 2 is high if the pin 6 is integrally formed on the propeller boss 2, but the disk 4 is used as the propeller boss 2. Unlike the above, since it has a plate shape, the disk 4 integrally formed with the pin 6 can be manufactured at low cost.

(Other embodiments)
The present invention is not limited to the above-described first and second embodiments, and various modifications can be made without departing from the gist of the present invention.

For example, the fastening member of the present invention does not necessarily have to be a bolt, but may be a pin or the like whose diameter can be changed by hydraulic pressure.

Further, the number of the pins 6 connecting the propeller boss 2 and the disc 4 does not necessarily have to be plural, and may be one.

1 Marine propeller 2 Propeller boss 21 Blade fixing hole 3 Propeller blade 31 Blade flange 4 Disc 41 Bolt (fastening member)
42 Through hole 5 Positioning hole 6 Pin 7 Adjustment hole 8 Bushing 8a Fitting hole

Claims (4)

A propeller blade including a blade flange,
A hollow propeller boss with blade fixing holes,
A disk that is in contact with the blade flange through the blade fixing hole, has a through hole that is inserted into a fastening member, and that is fastened to the blade flange by the fastening member and holds the propeller boss with the blade flange. When,
At least one pin retained on one of the propeller boss and the disc;
A bush inserted into an adjustment hole provided in the other of the propeller boss and the disc, the bush having a fitting hole that fits with the pin,
The marine propeller, wherein the through hole of the disk is an elongated hole extending in the circumferential direction around the center of the blade flange. The marine propeller according to claim 1, wherein the adjustment hole is an elongated hole that extends in the circumferential direction around the center of the blade flange. The marine propeller according to claim 1 or 2, wherein the pin is retained by the propeller boss or the disc by being fitted into a positioning hole formed in the propeller boss or the disc. The disk has an elliptical shape that is long in the axial direction of the propeller shaft,
The marine propeller according to any one of claims 1 to 3, wherein the pin is arranged at a position separated from the blade fixing hole in an axial direction of the propeller shaft.

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