JP2912573B2 - Wind turbine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wind turbine for wind power generation, and more particularly to a mechanism for efficiently transmitting power obtained by a rotating wind turbine to a generator.

[0002]

2. Description of the Related Art In order to operate a large wind turbine safely, it is necessary to control the pitch angle of a blade in accordance with the wind speed fluctuation. The pitch angle control includes a method using a hydraulic pressure, a method using an electric power cylinder, and the like. The following are required as the performance required for the pitch angle control device of the windmill (based on "Wind power generation technology", published by Power Corporation on March 25, 1990, written by Komaru Shimizu). (1) The device is lightweight and simple, (2) No failure occurs even after long-term unmanned operation, (3) The power consumed for pitch angle control is small, (4)
The number of revolutions must be controlled within specified values for wind speed fluctuations and load fluctuations.

However, the conventional wind turbine is far from completely covering these matters, and is mechanically complicated and expensive. In view of this, the present applicant has previously provided a wind turbine for wind power generation that has a simple apparatus, can withstand long-term operation, and does not require power for controlling the pitch angle in particular, and can be automatically adjusted (Japanese Patent Laid-Open No. Hei 7-91359). Reference). This is Figure 1
0, a flange portion 3 for fixing the blade 1 to one end.
, An external thread 4 at the middle, and a small thread 5 at the other end.
A hub screw including a blade shaft 2 having a female screw block 6 provided with a female screw portion 6a to be screwed with the male screw portion 4 of the blade shaft 2, and a plurality of holding cylinders 7 holding the female screw block 6;
8, a spring 9 interposed between the female screw block 6 and the holding cylinder 7, and a spring holder 1 for pressing and holding the spring 9.
0 and a thrust bearing 11, and a nut 12 screwed with the small-diameter thread portion 5 of the blade shaft 2 for holding the spring receiver 10 and the thrust bearing 11. The pitch of the blade 1 is adjusted by rotating the blade shaft 2 with respect to the female screw portion 6a of the female screw block 6 via the male screw portion 4.

[0004] With this configuration, when the speed of the wind acting on the blades 1 of the wind turbine changes, the centrifugal force applied to the wind turbine also changes automatically, but the centrifugal force acts on each blade 1 in accordance with this change. . By this centrifugal force, the male screw portion 4 of the blade shaft 2 rotates with respect to the female screw portion 6a of the female screw block 6 screwed with the blade shaft 2, and the pitch angle can be automatically adjusted. In this way, the pitch angle can be selected according to the magnitude of the wind with a simple mechanism using screws without using a special device, which is extremely advantageous in terms of cost, maintenance, and accuracy. became.

[0005] As described above, the pitch angle can be automatically controlled by the centrifugal force received by the blade, but the present applicant has made it possible to change the pitch angle even from the lower part of the column (pylon) supporting the windmill, and thus the typhoon. In such cases, a safe wind turbine was developed and a patent application was filed (Japanese Patent Application No. Hei 6-23079). According to this, the conversion of the minute pitch is automatically performed by the above-mentioned mechanism, and a large pitch change at the time of a typhoon or the like can be performed by operating the lower part of the steel tower.

[0006]

SUMMARY OF THE INVENTION The present invention provides a wind turbine for wind power generation, in which the mechanism for changing the pitch angle by operating the lower part of the tower is improved and the pitch angle can be changed more smoothly. Another object of the present invention is to provide a mechanism for preventing the power shaft from reversing and to ensure the safety of the equipment.

[0007]

Means for Solving the Problems A steel tower 15, a head shaft 21 having a hub case 8 provided with a plurality of blades 1 mounted at the tip end thereof and horizontally supported by a head boss 26 of a tower head 16b above the steel tower, Rudder 14 attached to 26
The blade 1 has a pitch fine adjustment mechanism that can automatically adjust the pitch according to the wind speed and an emergency pitch forced adjustment mechanism, and the pitch fine adjustment mechanism has a flange portion that fixes the blade 1 to one end. 3, a blade shaft 2 having a spline shaft 48 into which a shaft portion 47 having a hemispherical head portion 46 is fitted, and a male screw portion 4 of the blade shaft 2 and a screw. Female thread block 6 with female thread portion 6a
A hub case 8 having a plurality of holding cylinders 7 for holding the female screw block 6, a spring 9 interposed between the female screw block 6 and the holding cylinder 7, and a spring for pressing and holding the spring 9 It consists of a bearing 10 and a thrust bearing 11,
The pitch shaft of the blade 1 is finely adjusted by rotating the blade shaft 2 via the male screw portion 4 with respect to the female screw portion 6a of the female screw block 6 in accordance with the centrifugal force received by the blade 1, and the pitch forced adjustment mechanism includes: A blade pitch changing rod 18 erected in the tower 15 interlocking with a driving means such as a power cylinder 66 provided at the base of the tower 15, and a longitudinal movement of the rod 18 at the upper end of the rod 18 is used as a center axis. 35, and a mechanism for converting the lateral movement of the core shaft 35 into the axial movement of the blade shaft 2 orthogonal thereto.

A mechanism for converting the vertical movement of the blade pitch changing rod 18 constituting the forcible adjustment mechanism into the horizontal movement of the core shaft 35 is connected to the upper end of the blade pitch changing rod 18 via a cotter pin 56. A cone 55 slidable up and down with respect to a gear shaft 54 of the gear case 24, and a roller provided at an end of a core shaft 35 which is always in contact with a roller guide groove 58 provided in the conical portion of the cone 55. And 57.

The cone 55 is attached to a lower portion of a cone holding plate 60 slidably attached to the gear shaft 54, and the cone 55 is guided by a slide shaft 64 fixed to the cover 30 of the head boss 26. Moved up and down.

A mechanism for converting the lateral movement of the core shaft 35 into the axial movement of the blade shaft 2 includes a cone 36 rotatably attached to the end of the core shaft 35, and a conical surface of the cone 36. ,
The roller 40 at the tip of the arm 39, which is equally disposed on the base plate 42 attached to the hub case 8 side, is always in contact with the base plate 42, and the back of the arm 39 is in contact with the end of the spline shaft 48. The spherical head 46 at the tip of the fitted shaft portion 47 was brought into contact.

A projecting piece 44 is provided on both sides of the arm 39, and a coil spring 45 is bridged between the projecting pieces 44 adjacent to each other.
The roller 40 at the tip of the arm was always kept in close contact with the cone 36.

An anti-load rotation preventing clutch 70 is provided in the steel tower 15 below the power shaft 17 connected to the head shaft 21.

A reverse load rotation preventing clutch 70 has a clutch box composed of a clutch body 75 and a cover 76 that covers the clutch body 75. A large-diameter flange portion 77 at the lower end of the power shaft 17 is accommodated in the clutch box. , Flange 77
The upper surface of the clutch claw is provided with two clutch claw mounting recessed portions 79 diametrically opposed to each other. A clutch claw 80 is swingably mounted on this recessed portion 79, and the tip of the clutch claw 80 is formed in an arc-shaped convex surface 82. The inner teeth 82a are circumferentially arranged on the inner peripheral surface of the clutch body 75 corresponding to the arc-shaped convex surface 82, and the spring 83
The clutch 83 is always urged in the direction of the internal teeth by the spring 83 fitted in the hole.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be briefly described. FIG. 12 is an overall front view of a wind turbine device for power generation to which the present invention is applied, and FIG. 13 is a right side view of the same. 12 and 13, reference numeral 1 denotes a blade. In the example shown in the figure, three blades are arranged on the circumference. The three blades are in the center hub
8 is attached. 13 (FIG. 13) is a pipe extending rearward from the hub case 8, and a rudder 14 is attached to the rear of the pipe. Reference numeral 15 denotes a steel tower that supports the blades 1. At the top, a windmill is rotatably supported by a tower head 16b.

The steel tower 15 is composed of, for example, three steps of an upper column 15a, an intermediate column 15b, and a lower column 15c.
It has a two-sided pyramid shape. The lower end of the steel tower 15 is mounted on a base 16 so as to be able to undulate by means of an up-and-down shaft 16a (FIG. 12). Work.

A power shaft 17 and a blade pitch changing rod 18 are provided in the steel tower 15, and are configured so that the pitch of the blades can be changed manually or by power and also on the ground in an emergency such as a typhoon by a mechanism described later. I have. Reference numeral 18a is a manual handle, and the pitch is changed by rotating the handle. The base 16 is hollow, in which a generator and other mechanical equipment can be installed. Reference numeral 19 denotes a lever for raising and lowering a steel tower.
The steel tower 15 can be raised and lowered around the raising and lowering shaft 16a via the lever 19 by the expansion and contraction of the hydraulic cylinder 20 provided therein.

FIG. 1 is a detailed sectional view of the top of a steel tower 15 according to the present invention. The power generated by the rotation of the blade 1 of the wind turbine rotates the hub case 8 via bevel gears 49 and 51, and is transmitted to the head shaft 21 connected to the hub case 8, and the other end of the head shaft 21 forms the tower 15 Tower head 16
b, a bevel gear 2 incorporated in a gear case 24
2. The 90 ° direction is turned downward by the bevel gear 23 meshing therewith, and further transmitted to the power shaft 17 in the steel tower 15 via the spur gears 54a and 54b. Then, the power is transmitted to a generator and the like provided in the base 16. 25 is a rudder mounting part. The gear case 24 is fixed to the upper part of the tower,
A head boss 26 attached to the base of the head shaft 21 is supported by a gear case 24 by a bearing 27 so as to be horizontally rotatable. The upper portion of the head boss 26 is covered with a cover 30.

The head shaft 21 has a casing 3 fixed at its base to the head boss 26 by screws 31.
2 is rotatably supported by a bearing 33. 34 is an end cover of the casing 32.

At the center of the head shaft 21, a core shaft 35 for changing the pitch is inserted slidably in the horizontal direction. Core shaft 3
A conical body 36 that constitutes a mechanism for converting the lateral movement of the core shaft 35 into the axial movement of the blade shaft 2 orthogonal to the core shaft 35 is rotatably mounted on one end of the wind turbine 5 via a bearing 37. 38 is a screw for retaining. In the conical part of the conical body 36, a roller 40 attached to the tips of three arms 39 is provided.
Is in contact. The roller 40 is provided at the tip of the arm 39 as shown in FIG.
As shown in FIG. 3, it is rotatably attached by a pin 41. The arm 39 is fixed to a base plate 42 fixed to the end of the hub case 8 at intervals of 120 °.
Is pivoted to. The arm 39 has angular projections 44 on both sides of its base, and the projections 44 of the arms adjacent to each other are provided.
A coil spring 45 is stretched between them. By the coil spring 45, the roller 40 at the tip of the arm is constantly pressed against the cone 36.

At the back of the arm 39, a hemispherical head 46 in which the shaft 47 is inserted and held on a spline shaft 48 on which a bevel gear 49 is mounted is in contact. The spline shaft 48 has a screw portion 48b adjacent to the spline shaft 48 screwed into a screw hole provided at an end of the blade shaft 2, and a pin is inserted into the pin hole 50 to prevent the spline shaft 48 from coming off.

When the core shaft 35 is pushed rightward in FIG. 1, the cone 36 moves forward and the arm 3 is moved through the roller 40.
Push 9 outward. Then, the spline shaft 48 is pushed through the hemispherical head 46 to push the blade shaft 2. Then, the pitch is changed by turning the male screw portion 4.

As shown in the example of the figure, in the case of three blades, three bevel gears 49 mesh with a common bevel gear 51. The bevel gear 51 is rotatably mounted on a gear block 52 fixed to a cover 8a of the hub case 8 via a bearing. A piston 53 for adjusting pressure in the hub case 8 is fitted into the gear block 52. When the piston 53 moves in and out, the change in the internal pressure in the hub case 8 caused by the movement of the spline shaft 48 is automatically adjusted.

The other end of the core shaft 35 is in contact with a conical surface of a conical body 55 provided slidably up and down on a gear shaft 54 erected at the center of the gear case 24 provided at the upper end of the steel tower 15. I have.
The gear shaft 54 has a lower part on the gear case 24 and an upper part on the cover-3.
0 is supported by a bearing. Rod 1 for changing blade pitch
A cotter 8 is mounted on the upper end of the rod 18 so as to be vertically movable within a gear shaft 54 and engages with a cone 55 constituting a mechanism for converting a longitudinal movement of the rod 18 into a lateral movement of the core shaft 35. The pins are fixed. When the rod 18 is pulled down, the cone 55 is pulled down via the cotter pin 56. Then, the core shaft 35 in contact with the conical surface is pushed rightward. Then, since the cone 36 attached to the right end of the core shaft 35 is pushed rightward, the blade shaft 2 is pushed through the arm 39 and the spline shaft 48, so that the female screw block 6 is rotated and the pitch is changed. Conversely, when the rod 18 is pushed up, the core shaft 35 is pushed back to the left.

In FIG. 5, a roller 57 is attached to an end of the core shaft 35, and the roller 57 rolls along a roller guide groove 58 provided in the generatrix direction of the cone 55. The cone 55 has a peripheral groove 59 at the top thereof, and the groove 59 is engaged with and held by the inner peripheral groove 61 of the cone holding plate 60. The holding plate 60 has a cotter pin hole 62, into which the cotter pin 56 is inserted,
It is connected to a blade pitch changing rod 18. The cone holding plate 60 is divided into two parts (FIG. 6), and after clamping the blade pitch changing rod 18, the plate is fastened and fixed with two left and right bolts 63. Reference numeral 64 denotes a slide shaft, and the top is covered
It is fixed to 0. A pair of guide bars 65 are fixed by bolts 63 in the direction opposite to the roller guide groove 58 of the cone 55. The slide shaft 64 is sandwiched between the pair of guide bars 65, 65, and the cone 55 is guided by the slide shaft 64 to move up and down.

When the blade pitch changing rod 18 is pulled downward, the cone 55 is lowered. Then, the roller 57 provided at the end of the core shaft along the roller guide groove 58 is pushed to the right in the figure,
The rod exits to the right. The cone 36 at the end of the core shaft 35 is pushed, and the blade shaft 2 is advanced by the arm 39 via the threaded portion to change the pitch.

FIGS. 7 and 8 show details of the steel tower 15. FIG. In the case of the figure, the lower end of the blade pitch changing rod 18 has a power.
It is pivotally mounted on a lever 67 driven by a cylinder 66. The lever 67 is pivotally connected at one end to the bracket 68 and at the other end to the rod end of the power cylinder 66. The power cylinder 66 expands and contracts up and down by driving the motor 69, and moves the rod 18 up and down via the lever 67. As mentioned earlier, the tower 15 tilts around the undulating axis 16a. At this time, a pair of hydraulic cylinders 20, 20
Is raised and lowered by the operation of.

In FIG. 7, reference numeral 70 denotes a reverse load rotation preventing clutch provided at the lower end of the power shaft 17. 71 is a brake and flywheel, 72 is a rotary power disconnect clutch, and the power shaft 17
Is transmitted from the speed increaser 73 to the generator 74 via this. By providing a reverse load rotation prevention clutch on the power shaft 17, reverse rotation of the power shaft 17 is prevented, thereby preventing accidents in mechanical equipment. This will be described in detail below with reference to FIG.

The reverse load rotation preventing clutch 70 is housed in a clutch box composed of a clutch body 75 and a cover 76. A large-diameter flange portion 77 is provided at a lower end of the power shaft 17, and is rotatably supported on the clutch box above and below the flange portion 77 by bearings 78a and 78b. On the upper surface of the flange portion 77, two clutch pawl mounting concave portions 79 are provided so as to be diametrically opposed to each other. Then, a clutch claw 80 is screwed on this recess 79.
And is swingably attached to the flange portion 77. The clutch claw 80 is tapered and has a tip formed on an arc-shaped convex surface 82. The clutch body 7 corresponding to the arc-shaped convex surface 82
5, the inner teeth 82a are circumferentially arranged on the inner peripheral surface (12 in the figure). A hole into which the spring 83 is inserted is provided inside the clutch claw mounting recess 79, and the spring 83 fitted in this hole constantly urges the clutch claw 80 outward (in the direction of the internal teeth). 75 toward the internal teeth 82a.

With this configuration, when the power shaft 17 is normally rotating in the direction of arrow a in FIG.
0 is always pushed outward by a spring 83, and thus meshes with the internal teeth 82a, and the flange 77, the clutch body 7
5. The rotation is transmitted to the lower shaft 17a. However, if it reverses in the direction of the arrow b, the arcuate convex surface 82 of the clutch claw 80 pushed outward by the spring 83 slides on the internal teeth 82a and idles, so that the rotational power is transmitted to the lower shaft 17a. I can't. Therefore, reverse rotation of the power shaft 17 is prevented, and devices below the lower shaft 17a can be protected.

[0030]

【effect】

(1) Since the blade shaft 2 of the wind power generator is related to the centrifugal force, the wind speed (centrifugal force) generated by the rotation of the windmill is
Fine control can be performed to an appropriate pitch angle. (2) Power the blade pitch conversion rod 18 below the tower
By pulling with a driving means such as a cylinder, the pitch of the blades can be largely controlled on the ground in an emergency such as a typhoon, and a safe wind turbine can be provided. (3) In a mechanism for converting the lateral movement of the core shaft 35 into the axial movement of the blade shaft 2, a conical body 36 and an arm 3 with a roller are provided.
9 and the spline shaft 48 having the spherical head 46, so that the transmission can be performed very smoothly and smoothly. (4) To change the vertical movement of the blade pitch changing rod 18 into the horizontal movement of the core shaft 35, the cone 55 and the roller 5 are used.
7, the pitch change operation can be transmitted very smoothly and accurately. (5) Since the cone 55 is guided by the slide shaft 64, the cone 55 can be smoothly moved up and down smoothly without rotating. (6) Since the roller 40 provided at the tip of the arm 39 is pressed by the coil spring 45 bridged between the adjacent arms 39, the transmission can be performed accurately without any play. The core shaft 35 can always be urged rearward, and the movement of the blade pitch changing rod 18 can be kept in close contact with the guide groove 58 of the conical body 55 that transmits the movement to the core shaft 35. Smoothness can be achieved. (7) Since a reverse load prevention clutch is provided below the power shaft connected to the head shaft in the tower, rotation from the power shaft 17 to the generator 74 or the like should occur even if the blade shaft reverses. To keep the equipment underneath safe.

[Brief description of the drawings]

FIG. 1 is a detailed sectional view of the upper part of a steel tower.

FIG. 2 is a mechanism for transmitting the operation of a core shaft to a blade shaft.

FIG. 3 shows an arm and its related members.

FIG. 4 is a detailed structure of a spline shaft.

FIG. 5 is a mechanism for transmitting the operation of a blade pitch changing rod to a core shaft.

FIG. 6 shows details of a cone.

FIG. 7 is an overall view of a steel tower.

FIG. 8 is an enlarged view of the lower part of the tower.

FIG. 9 is a detailed view of a reverse load prevention clutch.

FIG. 10 shows a configuration of a blade mounting portion according to the present invention.

11A and 11B are detailed views of a blade shaft, wherein FIG. 11A is a side view, FIG. 11B is a front view of a flange, and FIG. 11C is a sectional view of a female screw block.

FIG. 12 shows a wind turbine of the present invention and a tower supporting the wind turbine.

FIG. 13 is a right side view of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Blade 2 Blade shaft 3 Flange part 4 Male thread part 5 Small thread part 6 Female thread block 6a Female thread part 7 Holding cylinder 8 Hub case 9 Spring 10 Spring receiver 11 Thrust bearing 12 Nut 13 Pipe 14 Rudder 15 Steel tower 15a Upper column 15b Intermediate column 15c Lower column 16 Base 16a Raising and lowering shaft 16b Tower head 17 Power shaft 18 Blade pitch changing rod 18a Manual handle 19 Steel tower hoisting lever 20 Hydraulic cylinder 21 Head shaft 22, 23 Bevel gear 24 Gear case 25 Direction rudder Mounting part 26 Head boss 27 Gear 28, 29 Spur gear 30 Cover 31 Screw 32 Casing 33 Bearing 34 Cover 35 Core shaft 36 Conical body 37 Bearing 38 Screw 39 Arm 40 Roller 41 Pin 42 Base plate 43 Bracket 44 Projection piece 45 Coil spring 46 Spherical head 47 Shaft 48 Spline shaft 48a Spline 48b Thread 49 Bevel gear 50 Pin hole 51 Bevel gear 52 Gear block 53 Piston 54 Gear shaft 54a Gear 54b Tooth Wheel 55 Cone 56 Cotter pin 57 Roller 58 Roller guide groove 59 Circumferential groove 60 Conical body holding plate 61 Inner circumferential groove 62 Cotter pin hole 63 Bolt 64 Slide shaft 65 Guide bar 66 Power cylinder 67 Lever 68 Bracket 69 Motor 70 Reverse load rotation prevention clutch 71 Brake and flywheel 72 Rotational power disconnect clutch 73 Gearbox 74 Generator 75 Clutch body 76 Cover 77 Flange 78a, 78b Bearing 79 Claw mounting recess 80 Clutch claw 81 Screw 82 Arc-shaped convex surface 82a Internal tooth 83 Spring

Claims (5)

(57) [Claims] 1. A tower (15) and a tower head above the tower.
A plurality of blades (1) horizontally supported by the head boss (26) of (16b)
Head axle (21) with hub case (8) equipped with
And a rudder (14) attached to a head boss (26), wherein the blade (1) has a pitch fine adjustment mechanism and an emergency pitch forced adjustment mechanism that can automatically adjust the pitch according to the wind speed, The pitch fine-adjustment mechanism includes a shaft portion having a flange portion (3) at one end for fixing the blade (1), a male screw portion (4) at an intermediate portion, and a hemispherical head (46) at the other end. 47) A blade shaft (2) having a spline shaft (48) fitted with it, and a male screw portion of the blade shaft (2).
Female screw block with female screw part (6a) to be screwed with (4)
(6) and a plurality of holding cylinders for holding the female screw block (6)
Hub case (8) with (7) and female screw block
(6) A spring (9) interposed between the holding cylinder (7), a spring receiver (10) for pressing and holding the spring (9), and a thrust bearing (11), and the blade (1) The male screw portion (6a) of the female screw block (6)
The blade shaft (2) is rotated via (4) to finely adjust the pitch angle of the blade (1), and the forcible pitch adjustment mechanism comprises a power cylinder (66) provided at the base of the steel tower (15). And a blade pitch changing rod (18) erected in a steel tower (15) interlocking with a driving means such as the above, and is connected to the upper end of the blade pitch changing rod (18) via a cotter pin (56). , A cone (55) slidable up and down with respect to the gear shaft (54) of the gear case (24), and a roller guide groove (58) provided in the conical portion of the cone (55) at all times. A roller (57) provided at an end of the core shaft (35), and a mechanism for converting the lateral movement of the core shaft (35) into the axial movement of the blade shaft (2) is provided by the mechanism (35). ) With a cone (36) rotatably mounted at the end of the cone (3).
The roller (40) at the tip of the arm (39), which is arranged evenly on the base plate (42) attached to the hub case (8) side, is always in contact with the conical surface of (6), and A wind turbine for wind power generation, wherein a spherical head (46) at the tip of a shaft (47) inserted into the end of the spline shaft (48) is brought into contact with the back of the arm (39). 2. The cone (55) is attached to a lower portion of a cone holding plate (60) slidably attached to a gear shaft (54),
The wind turbine for wind power generation according to claim 1, wherein the cone (55) is vertically moved by being guided by a slide shaft (64) fixed to the cover (30) of the head boss (26). 3. A projecting piece (44) is provided on both sides of the arm (39),
A wind power generator according to claim 1, wherein a coil spring (45) is stretched between adjacent projecting pieces (44), and a roller (40) at the end of the arm is always kept in close contact with the cone (36). Windmill. 4. The head shaft (21) in a steel tower (15).
4. The wind turbine for wind power generation according to claim 1, wherein a reverse load rotation preventing clutch (70) is provided below the power shaft (17) connected to the wind turbine. 5. A reverse-load rotation preventing clutch (70) has a clutch box comprising a clutch body (75) and a cover (76) covering the clutch body (75), and a lower end of a power shaft (17) is provided in the clutch box. The large-diameter flange (77) is accommodated, and the flange (7
On the upper surface of (7), two clutch pawl mounting recesses (79) are provided so as to oppose each other in diameter, and a clutch pawl (80) is swingably mounted on this concave (79). The tip is formed in an arcuate convex surface (82), and the inner teeth (82a) are circumferentially arranged on the inner peripheral surface of the clutch body (75) corresponding to the arcuate convex surface (82),
Further, a spring (8
5. The wind turbine for wind power generation according to claim 4, wherein a hole for inserting 3) is provided, and the clutch claw (80) is always urged in the direction of the internal teeth by a spring (83) fitted in the hole.