JPH05196048A - Bearing sealing device - Google Patents

Abstract

PURPOSE:To obtain a bearing sealing device in which the sealing ability is not reduced by a centrifugal force and the like. CONSTITUTION:This bearing sealing device is the device provided along two members rotating relatively so as to seal between the two members, and its base 92a is formed to fix to one side member such as the root 6 of a windmill blade, and to be sealed. The tip 92c is formed to pressure-contact elastically to the other side member such as a bearing outer ring 3, for example, from the outer side to the inner side of the lubricating oil flowing-out part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing sealing device provided to prevent lubricating grease or the like injected into a bearing from flowing out due to centrifugal force or the like.

[0002]

2. Description of the Related Art FIG. 3 shows a ball bearing for supporting a variable blade root portion of a conventional wind turbine. Bearing outer ring of ball bearing 3
A wind turbine blade root portion 6 is attached via a bearing ball 4 and a bearing inner ring 5 so that the blade angle can be changed around a blade deflection angle rotation center line BC. In order to prevent the grease injected from the grease injection hole 3h from flowing out, the inner sealing device 7 fixed to the bearing outer ring 3 and elastically contacting the bearing inner ring 5, and the bearing outer ring 3 fixed to the bearing inner ring 5 are attached. Elastically contacting outer sealing device 9
And are provided. The wind turbine blades having rotational symmetry receive wind and rotate around the wind turbine rotation axis center line RC.

[0003]

The conventional ball bearing sealing device for supporting the variable blades of the wind turbine is as described above, but when the wind turbine rotates, if there is play due to centrifugal force or the like, the bearing outer ring 3 will be damaged. On the other hand, if the bearing inner ring 5 moves outward and the contact force of the outer sealing device 9 with the bearing outer ring 3 becomes smaller or a gap is created, the sealing ability of the outer sealing device 9 deteriorates and the outer sealing device 9 is shaken by centrifugal force or the like. There is a problem that the grease in the blown-out bearing pushes out the outer sealing device 9 and flows out.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a bearing sealing device in which the sealing ability is not deteriorated by centrifugal force or the like.

[0005]

In the bearing sealing device according to the present invention, the base portion is formed so as to be fixed and sealed to one member, and the tip portion of the other end is directed from the outside to the inside of the lubricating oil outflow. It is formed so as to elastically contact the member.

[0006]

The base portion of the bearing sealing device according to the present invention is fixed to one member so as to seal regardless of centrifugal force or the like. The tip of the lubricating oil is formed so as to elastically come into pressure contact with the other member from the outside to the inside of the lubricating oil, so if the lubricating oil is about to flow out due to centrifugal force, etc. Works to press the tip against the other member. Further, even if there is a displacement between the members, the tip end part is elastically displaced and follows. Thus, the tip portion of this bearing sealing device is in good pressure contact with the other member and maintains the sealing ability even when centrifugal force or the like acts.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 2 denotes a wind turbine rotating shaft, which receives wind energy by a plurality of wind turbine blades and rotates to rotationally drive a connected generator (not shown). Reference numeral 6 denotes a seal ring integrally fixed to the wind turbine blade root portion or the outer periphery of the wind turbine blade root portion. The wind turbine blade root portion 6 is rotatably supported by a ball bearing composed of a bearing outer ring 3, a bearing ball 4 and a bearing inner ring 5. The bearing outer ring 3 is fixed to the wind turbine rotating shaft 2, and the bearing inner ring 5 is fixed to the wind turbine blade root portion 6 and the like. The bearing outer ring 3 is provided with a grease injection hole 3h, and an inner sealing device 7 is provided on the inner side (closer to the wind turbine rotation axis center line RC) so that the grease injected from the grease injection hole 3h does not flow out. An outer sealing device 9 is provided (on the side farther from the wind turbine rotation axis center line RC). The inner sealing device 7 is an elastic body such as a circular plate-shaped rubber material similar to the conventional one, the outer peripheral edge is fitted to the inner peripheral portion of the bearing outer ring 3, and the inner peripheral edge is the end surface of the bearing inner ring 5. It is formed so as to be elastically pressed against.

In FIG. 1, an outer sealing device 9 is a sealing device body made of an elastic material such as plastic, which has an annular shape so as to seal an outer gap between the bearing outer ring 3 and the bearing inner ring 5. A seal case 92, a tip seal material 94 and a base seal material 96 (O
Ring) and. Base portion 92a of the seal case 92
Is relatively rigid so as to be fitted onto the outer peripheral surface of the wind turbine blade root portion 6 and the like, and is fixed to the outer peripheral surface of the wind turbine blade root portion 6 by means such as bolt tightening (not shown). Base 92
A groove into which the base sealing material 96 is fitted is formed on the inner peripheral surface of a, and the base sealing material 96 is sandwiched between the base portion 92a of the seal case 92 and the wind turbine blade root portion 6 or the like. The seal case 92 includes the intermediate portion 9 that forms a curved surface from the base portion 92a.
2b, a tip portion 92c is formed as a continuous surface, and the tip portion 92c is directed from the right side to the left side in the right half sectional view of the ball bearing shown in FIG. It is formed from the left side to the right side. That is, the tip portion 92c is formed so as to face inward from the outside in the grease outflow direction. Middle part 9
The thickness is gradually reduced from 2b to the tip portion 92c, and the tip portion 92c can be elastically deformed or elastically displaced. At the tip of the tip 92c,
The tip seal material 94 is fitted by fitting the tip of the tip portion 92c into the groove of the outer circumference of the annular tip seal material 94 having an elliptical cross section.

When the outer sealing device 9 is fastened to the outer peripheral surface of the wind turbine blade root portion 6 or the like, the outer side of FIG. 1 is adjusted so that the tip seal material 94 abuts the end surface of the bearing outer ring 3 with an appropriate elastic force. The vertical position of the sealing device 9 is adjusted and set, and the sealing device 9 is fastened to the wind turbine blade root portion 6 or the like. Of course, it is natural that the surfaces of the tip seal material 94 and the base seal material 96 and the surfaces of the mating members with which they abut are formed smoothly.

Next, the operation will be described. In FIG. 1, grease is injected through the grease injection hole 3h. When the wind comes, the wind turbine blade extending from the root portion 6 of the wind turbine blade and the like in the figure is hit by the wind in the left-right direction, and the component force in the direction perpendicular to the paper surface generated on the wind turbine blade causes the wind turbine rotating shaft 2 to be the center of the wind turbine rotating shaft. Line R
It rotates around C and drives a generator (not shown). During operation, according to conditions such as wind speed, the wind turbine blade roots 6 and the like 6 are rotated by the blade angle changing center line B by a blade angle changing device (not shown).
The angle is driven to change around C, and the blade angle is changed to a desired angle.

During operation, in addition to gravity applied to each member and grease, centrifugal force is applied when the wind turbine rotates. In particular, the wind turbine blades are long and heavy, and therefore exert a great deal of force. During rotation, gravity and centrifugal force are overlapped on the wind turbine blades that face downward, and if there is play in the bearings, etc., as shown in FIG. 2, the bearing outer ring 3, the bearing inner ring 5, the wind turbine blade roots, etc. 6 There is a gap between and. At this time, the upper side of FIG. 2 is in the direction of gravity, that is, the lower side, and both gravity and centrifugal force act upward in the figure. At this time, the grease in the bearing is also subjected to an upward force due to gravity and centrifugal force, and tends to flow out by pushing the seal case 92 from the left side to the right side in the drawing. The seal case 92 is formed so as to be gradually thin toward the portion 92c, is elastically deformable, and has a curved surface, and the tip portion 92c is formed from the outer side to the inner side in the grease outflow direction. When pushed from the left to the right in the figure by the attempted pressure, the tip portion 92c elastically deforms in the counterclockwise direction in the figure, and pushes the tip sealing material 94 against the surface of the bearing outer ring 3. The greater the force of the grease flowing out,
Since the tip seal member 94 is strongly pressed against the bearing outer ring 3, the outer sealing device 9 well blocks the outflow of grease. At the location where the outer sealing device 9 contacts the wind turbine blade root portion 6 and the like, the base sealing material 96 is sandwiched and fastened to prevent the grease from flowing out.

The structure of the outer sealing device 9 is, for example, such that the base portion 92a is fastened to the bearing outer ring 3 and the tip sealing material 94 of the tip portion 92c is brought into contact with the outer peripheral surface of the wind turbine blade root portion 6 or the like. May be. Alternatively, the tip seal member 94 may be omitted, and the tip 92c may directly contact the surface of the bearing outer ring 3, for example.

[0013]

As described above, according to the present invention, the tip portion of the bearing sealing device is formed so as to elastically come into pressure contact with the other member from the outside to the inside of the lubricating oil outflow. Since the pressure of the lubricating oil acts so as to press the tip portion against the other member, the sealing ability can be well maintained even when centrifugal force or the like acts.

[Brief description of drawings]

FIG. 1 is a half sectional view showing a bearing sealing device according to an embodiment of the present invention.

FIG. 2 is a half cross-sectional view showing a displaced state of the bearing sealing device according to the embodiment of the present invention.

FIG. 3 is a sectional view of a conventional bearing sealing device.

[Explanation of symbols]

2: Wind turbine rotating shaft, 3: Bearing outer ring, 4: Bearing ball, 5: Bearing inner ring, 6: Wind turbine blade root part, 7: Inner sealing device, 9: Outer sealing device, 92: Seal case, 92a: Base part, 92c : Tip part, 94: Tip part seal material, 96: Base part seal material, RC: Wind turbine rotation axis center line, BC: Blade variable angle rotation center line.

Claims (1)

[Claims] 1. A bearing sealing device which is provided so as to seal between two members which rotate relative to each other, wherein a base portion is formed so as to be fixed and sealed to one member, and a tip portion is provided with a lubricating oil outflow. A bearing sealing device, which is formed so as to elastically come into pressure contact with the other member from one side toward the inside.