JP5997408B1 - Marine propeller - Google Patents

Abstract

An assembly-type marine propeller capable of easily changing the pitch of propeller blades is provided. A marine propeller includes a propeller blade including a blade flange, a hollow propeller boss provided with a blade fixing hole, and a blade flange that abuts the blade flange through the blade fixing hole and is fastened to the blade flange by a fastening member. A propeller boss holding disc, at least one pin held on one of the propeller boss and the disc, and a bushing inserted in an adjustment hole provided on the other side of the propeller boss and the disc, the fitting fitting with the pin A bush having a joint hole. [Selection] Figure 2

Description

  The present invention relates to an assembly-type marine propeller.

  One marine propeller 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. Thus, an assembly-type marine propeller in which a plurality of propeller blades and propeller labs are separated may be used.

  For example, Patent Document 1 discloses an assembly-type marine propeller 100 as shown in FIGS. 12 (a) and 12 (b). In this marine propeller 100, the blade flange 121 of the propeller blade 120 is fastened to the hollow propeller boss 110 by the stud bolt 130 and the 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 blade 120 can be adjusted by the length of the opening 111.

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

Special Table 2002-54463

  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 for each stud bolt 130. A plurality of (for example, 16) tension screws 160 are required. Accordingly, the work of attaching the prepeller blades to the propeller boss is complicated.

  On the other hand, there are also assembly-type marine propellers in which the operation of attaching the propeller blades to the propeller boss is simpler. In this marine propeller, a disk is disposed in the propeller boss. The disc 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 sandwich the propeller boss together with the blade flange.

  The blade 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 is fitted. On the other hand, an adjustment hole is provided in the propeller boss, and a bush having a fitting hole for fitting with the pin is inserted into the adjustment 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 propellers and replace the bushes. In order to remove the propeller blade from the propeller boss, first, the bolt for fastening the disk to the blade flange is removed, and then the propeller blade is transferred from above the propeller boss using a crane or the like. However, it is desirable to avoid propeller blade transfer work using a crane or the like as much as possible.

  Then, an object of this invention is to provide the assembly-type marine propeller which can change the pitch of a propeller blade | wing easily.

  In order to solve the above-mentioned problems, a marine propeller according to the present invention is a fastening member that abuts against a propeller blade including a blade flange, a hollow propeller boss provided with a blade fixing hole, and the blade flange through the blade fixing hole. The disc is fastened to the vane flange and sandwiches the propeller boss with the vane flange, at least one pin held on one of the propeller boss and the disc, and provided on the other of the propeller boss and the disc. A bush inserted into the adjustment hole, the bush having a fitting hole for fitting with the pin.

  According to said structure, when changing the pitch of a propeller blade | wing, if a fastening member which fastens a disk to a blade | wing flange is removed and a disk is removed from the inside of a propeller boss, a bush will be exchangeable. That is, it is not necessary to remove the propeller blade from the propeller boss. For this reason, the pitch of the propeller blades can be easily changed.

  The adjustment hole may be a long hole extending in the circumferential direction around the center of the blade flange. According to this configuration, a large adjustment range of the pitch of the propeller blades can be ensured.

  For example, the pin may be held on the propeller boss or the disc by fitting with a positioning hole provided on 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 disposed at a position that is separated from the blade fixing hole in the axial direction of the propeller shaft. According to this configuration, even when the number of propeller blades is large, the propeller boss can be downsized.

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

1 is a perspective view showing a marine propeller according to a first embodiment of the present invention. It is sectional drawing of the marine propeller shown in FIG. It is sectional drawing along the III-III line of FIG. (A) is an enlarged view of the principal part of FIG. 2, (b) is sectional drawing along the IV-IV line of (a), (c) is a bottom view corresponding to (b). It is a bottom view which shows the other shape of an adjustment hole and a bush. (A) And (b) is a fragmentary sectional view of the marine propeller of a modification. (A) And (b) is a fragmentary sectional view of the marine propeller 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 in (a), and (c) is VIIIC- in (b). It is sectional drawing along the VIIIC line. (A) And (b) is a fragmentary sectional view of the marine propeller of a modification. (A) And (b) is a fragmentary sectional view of the marine propeller of a modification. It is a fragmentary sectional view of the marine propeller of a modification. (A) is a fragmentary sectional view of the conventional marine propeller, (b) is sectional drawing along the XII-XII line 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 separated. In the present embodiment, the number of propeller blades 3 is 4, but the number of propeller blades 3 may be 3 or less, or 5 or more.

  The propeller boss 2 is hollow. In the present embodiment, the propeller boss 2 has a cylindrical 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. A cover 14 is fixed to the other end of the propeller boss 2 by a plurality of bolts (not shown). 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 this embodiment, the outer portion (portion close to the outer peripheral surface of the propeller boss 2) of each blade fixing hole 21 has a large diameter, and the inner portion (portion close to the inner peripheral surface of the propeller boss 2) has a small diameter. In other words, an annular protrusion that protrudes inward in the radial direction of the blade fixing hole 21 is formed in an inner portion of each blade fixing hole 21.

  Each propeller blade 3 includes a blade flange 31 for connection to the propeller boss 2. In the present 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) constitutes 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 are formed on the back side surface of the blade flange 31 (surface located on the radially inner side of the propeller boss 2) to be screwed with bolts 41 described later. In the illustrated example, the screw holes 32 are arranged at equiangular intervals around the center of the blade flange 31, but the intervals between the screw holes 32 may not be equiangular.

  In the propeller labs 2, the same number of 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 the present 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 disk 4 from the inside of the propeller boss 2 and is screwed into the screw hole 32. The disc 4 clamps the propeller boss 2 (more precisely, the annular protrusion formed in the inner portion of the blade fixing hole 21 described above) together with the blade flange 31 by fastening the blade 41 to the blade flange 31.

  The propeller boss 2 and the disk 4 are connected by a plurality (four in the illustrated example) of pins 6 extending in the axial direction of the blade fixing hole 21. These pins 6 serve to stop 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 cylindrical shape whose axial length is longer than the 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 a direction orthogonal thereto.

  In the present embodiment, the two pins 6 are arranged at positions spaced apart 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 away 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, each pin 6 is held by the propeller boss 2 in this embodiment. 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 fitting into the positioning hole 5. In the present embodiment, the pin 6 is fixed to the propeller boss 2 by a bolt 91 that passes through 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 is fitted. 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 blade 3 can be adjusted.

  More specifically, the bush 8 has a length equal to the thickness of the disk 4 and defines the fitting hole 8a, and the opposite end from the end of the tubular portion 81 opposite to the propeller boss 2 A pair of flange portions 82 are provided. The flange portion 82 is fixed to the disk 4 with a bolt 92.

  In the marine propeller 1 having the configuration described above, when the pitch of the propeller blades 3 is changed, the bush 8 can be replaced by removing the bolts 41 and removing the disk 4 from the propeller labs 2. That is, it is not necessary to remove the propeller blade 3 from the propeller boss 2. For this reason, the pitch of the propeller blades 3 can be easily changed.

  In addition, in the present embodiment, the disk 4 has an elliptical shape, and the pins 6 are disposed on both sides of the blade fixing hole 21 in the axial direction of the propeller shaft 11, so even if the number of propeller blades 3 is large, the propeller The boss 2 can be reduced in size.

<Modification>
In the above-described embodiment, the blade flange 31 has a stepped shape, but has a stepped shape so that the disk 4 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 an annular protrusion, and the blade flange 31 may not be inserted into the blade fixing hole 21. This modification can also be applied to a second embodiment described later.

  The disk 4 is not necessarily in direct contact with the blade flange 31, and may be in contact with the blade flange 31 indirectly through 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 a long hole extending in the circumferential direction around the center of the blade flange 31. According to this configuration, a large adjustment range of the pitch of the propeller blades 3 can be ensured. This modification can also be applied to a second embodiment described later.

  Moreover, the fixing method of the pin 6 and the bush 8 can be changed as appropriate. For example, as shown in FIG. 6A, the length of the cylindrical portion 81 of the bush 8 may be increased and the flange portion 82 may be positioned outside the adjustment hole 7. Further, a blocking portion 83 may be provided at the end of the cylindrical portion 81 opposite to the propeller boss 2, and the pin 6 may be supported by the blocking portion 83.

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

  Or as shown to Fig.7 (a), the flange part 82 of the bush 8 may be provided in the edge part by the side of the propeller boss 2 of the cylindrical part 81. FIG. Further, 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 passes through the disk 4, the pin 6 is supported by the closing portion 83 provided at the end of the cylindrical portion 81 opposite to the propeller boss 2. May be.

(Second Embodiment)
FIGS. 8A to 8C show a part of a marine propeller according to a second embodiment of the present invention. The overall configuration of the marine propeller of the present embodiment is the same as that of the first embodiment shown in FIGS. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and a duplicate description is omitted.

  In the present embodiment, each pin 6 is held on the disk 4. Specifically, the disk 4 is provided with a positioning hole 5 penetrating the disk 4, and the pin 6 is held in the disk 4 by fitting into the positioning hole 5. In the present embodiment, the pin 6 is fixed to the propeller boss 2 by a bolt 93 that is screwed into a screw hole provided on the side surface of the disk 4. A shaft portion may be provided at the tip of the bolt 93, and the shaft portion 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 is fitted. 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 blade 3 can be adjusted.

  More specifically, the bush 8 spreads in the opposite direction from the cylindrical portion 81 that defines the fitting hole 8a having the same length as the depth of the adjustment hole 7 and the end of the cylindrical portion 81 on the disk 4 side. A pair of flange portions 82 are provided. The flange portion 82 is fixed to the propeller boss 2 with a bolt 92.

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

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

  Alternatively, as shown in FIG. 9 (b), 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 6 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 blocking portion 84 may be provided at the end of the cylindrical portion 81 opposite to the disk 4.

  Alternatively, as shown in FIG. 10B, the positioning hole 5 provided in the disk 4 may be a screw hole, and a screw thread that is screwed into the screw hole may be formed on the pin 6.

  Alternatively, as shown in FIG. 11, the pins 6 may be held on the disk 4 by being formed integrally with the disk 4. When the pin 6 is held by the propeller boss 2 as in the first embodiment, if the pin 6 is formed integrally with the propeller boss 2, the manufacturing cost of the propeller boss 2 is increased. In contrast, the disk 4 is formed in a plate shape, so that the disk 4 on which the pins 6 are integrally formed can be manufactured at low cost.

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

  For example, the screw hole 32 screwed with the bolt 41 may be provided in the disk 4 instead of the blade flange 31, and the bolt 41 may pass through the blade flange 31 from the outside of the propeller boss 2 and screw into the screw hole 32. .

  Further, the fastening member of the present invention is not necessarily a bolt, and may be a pin whose diameter can be changed by hydraulic pressure, for example.

  Also, the number of pins 6 that connect the propeller boss 2 and the disk 4 is not necessarily plural, and may be one.

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

Claims (4)

A propeller blade including a blade flange;
Hollow propeller labs with blade fixing holes,
A disc that contacts the blade flange through the blade fixing hole, is fastened to the blade flange by a fastening member, and sandwiches the propeller boss together with the blade flange;
At least one pin held on one of the propeller boss and the disc;
A bush inserted into an adjustment hole provided on the other side of the propeller boss and the disc, the bush having a fitting hole to be fitted to the pin;
A marine propeller.   The marine propeller according to claim 1, wherein the adjustment hole is a long hole extending in a circumferential direction around the center of the blade flange.   3. The marine propeller according to claim 1, wherein the pin is held by the propeller boss or the disc by fitting with a positioning hole provided in the propeller boss or the disc. The disc 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 disposed at a position spaced apart from the blade fixing hole in the axial direction of the propeller shaft.

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