JP6790730B2 - Sealing device - Google Patents

Description

The present invention relates to a sealing device.

Rolling bearings are widely used to support rotating shafts, and generally rolling bearings are provided in an annular space formed between the shaft and the housing. A sealing device is further provided in this annular space, and the sealing device prevents foreign matter from entering the rolling bearing side and prevents lubricant such as grease of the rolling bearing from flowing out. There is.

As shown in FIG. 6, as a sealing device, an oil seal 90 including an annular core member 91 attached to the housing 99 and an annular rubber seal body 92 integrated with the core member 91 is known. (See, for example, Patent Document 1). The oil seal 90 is attached to the annular space 97 with a predetermined tightening allowance S with respect to the shaft 98 in consideration of the eccentricity and inclination of the shaft 98 with respect to the housing 99. Such an oil seal 90 may be used, for example, in a bearing unit that supports a spindle of a wind power generator.

JP-A-2006-214532

The spindle of a wind power generator is larger than, for example, a spindle of a machine tool, and the amount of eccentricity and the amount of inclination are also large. When the oil seal 90 is applied to a device provided with such a large shaft 98, the amount of eccentricity and the amount of inclination of the shaft 98 may exceed the assumed values (allowable values). As shown by the alternate long and short dash line in FIG. 6, if the amount of eccentricity and the amount of inclination of the shaft 98 become too large, there is a problem that it becomes difficult to secure the sealing property.

Therefore, an object of the present invention is to improve the performance of the sealing device.

The present invention is a sealing device provided between an outer member having an inner peripheral surface of a cylinder and an axially inner shaft of the inner peripheral surface of the cylinder, and has elasticity with an annular core member attached to the outer member. The seal body includes an annular seal body that is fixed to the core member, and the seal body includes a fixing portion that is fixed to the core member, a lip tip portion that can contact the shaft, and the fixing. A lip base portion connecting the portion and the lip tip portion is provided , and flexible electrodes are provided on one side and the other side of the lip base, respectively, and the electrode on the one side and the other side are provided. Further, a detection control unit for detecting a change in an electric signal from the electrode is provided .

According to this sealing device, the dielectric actuator is composed of an electrode on one side, an electrode on the other side, and a part of the lip base between the two electrodes. Therefore, by applying a voltage between the electrodes, the lip base can be deformed, for example, the lip tip can be made to follow the eccentricity or inclination of the shaft, and when the seal body is deformed, the capacitance between the electrodes increases. Since it changes, it is possible to detect the deformation mode of the seal body by acquiring an electric signal output from the electrode based on this change. That is, the sealing device can improve the sealing performance by providing such a function. Since the electrodes have flexibility, the original followability of the seal body with respect to the shaft is not impaired.
Further, since the sealing device further includes a detection control unit for detecting a change in an electric signal from the electrode on the one side and the electrode on the other side, when the seal body is deformed, the space between the electrodes is further provided. Since the capacitance changes, it is possible to detect the deformation mode of the seal body by detecting the change in the electric signal based on this change. For example, it is possible to detect a decrease / increase in the tightening allowance of the lip tip with respect to the shaft.

Further, the present invention is a sealing device provided between an outer member having an inner peripheral surface of a cylinder and an axially inner shaft of the inner peripheral surface of the cylinder, and an annular core member attached to the outer member. An annular seal body having elasticity and being fixed to the core member is provided, and the seal body includes a fixing portion fixed to the core member, a lip tip portion that can come into contact with the shaft, and the like. A lip base portion connecting the fixing portion and the lip tip portion is provided, and flexible electrodes are provided on one side and the other side of the lip base portion, and the electrodes are provided with an insulating material in the circumferential direction. It is divided into multiple sections along.

Further, the present invention is a sealing device provided between an outer member having an inner peripheral surface of a cylinder and an axially inner shaft of the inner peripheral surface of the cylinder, and an annular core member attached to the outer member. An annular seal body having elasticity and being fixed to the core member is provided, and the seal body includes a fixing portion fixed to the core member, a lip tip portion that can come into contact with the shaft, and the like. A lip base portion connecting the fixing portion and the lip tip portion is provided, and flexible electrodes are provided on one side and the other side of the lip base portion, and the electrodes are fixed by an insulating material. It is divided into a plurality of sections along the direction from the portion toward the lip tip portion.

According to the above configuration, since the electrodes are partitioned into a plurality of regions, each of the partitioned electrode portions can be selectively used. For example, by selecting the electrode portion to be detected of the electric signal, it is possible to detect the deformation mode of the seal body more strictly, and by selecting the electrode portion to be applied, it is more rigorous. It is possible to deform the seal body (more partially).

Further, it is preferable that the sealing device further includes a power supply control unit that adjusts and applies a voltage between the electrode on the one side and the electrode on the other side. According to this sealing device, by applying a voltage between the electrodes, the lip base is deformed between the electrodes, and the lip tip can be made to follow the eccentricity and inclination of the shaft.
Further, when the one surface side is the inner peripheral surface side of the lip base and the other surface side is the outer peripheral surface side of the lip base , the electrode on the other surface side is fixed more than the electrode on the one surface side. It is preferable that it is provided closer to the portion side. In this case, by applying a voltage between the electrode on the one side and the electrode on the other side to reduce the distance between the two, the lip base can be deformed so as to be curved.

According to the present invention, an electrode provided on both sides of the lip base of the seal body and a part between these electrodes constitute a dielectric actuator, which can be used as a sensor or an actuator. This makes it possible to improve the performance of the sealing device.

It is sectional drawing which shows one Embodiment of the sealing apparatus of this invention. It is a block diagram of a sealing device. (A) is an explanatory diagram of the first electrode, and (B) is an explanatory diagram of the second electrode. It is an image figure when the shaft and the sealing device are viewed from the direction parallel to the center line of the sealing device. It is sectional drawing of the sealing device. It is sectional drawing of the conventional sealing device.

FIG. 1 is a cross-sectional view showing an embodiment of the sealing device of the present invention. The sealing device 10 of the present embodiment is provided together with a rolling bearing (not shown) that supports the main shaft (hereinafter, simply referred to as the shaft 5) of the wind power generator. Specifically, the bearing box that supports the shaft 5 includes a housing (outer member) 6 having a cylindrical inner peripheral surface 6a, and the housing 6 and the axially inner shaft 5 of the cylindrical inner peripheral surface 6a. An annular space 4 is formed between the and. The rolling bearing is provided in the center of the annular space 4, and the sealing devices 10 shown in FIG. 1 are provided on both sides in the axial direction thereof.

The sealing device 10 includes an annular core member 11 attached to the housing 6 and an annular seal body 20 fixed to the core member 11. The core member 11 is made of metal such as stainless steel and has an L-shaped cross section. The core member 11 is fixed to the housing 6 via a part of the seal body 20 (a part 24 of the fixing portion 21 described later). The seal body 20 is made of a dielectric material, is made of rubber (elastomer) such as NBR, FKM, and ACM, and has elasticity. The seal body 20 is integrated with the core member 11 by vulcanization adhesion.

The seal body 20 has a fixing portion 21, a lip base portion 22, and a lip tip portion 23. The fixing portion 21 is a portion fixed to the core member 11, the lip tip portion 23 is a portion that can come into contact with the shaft 5, and the lip base portion 22 is a portion that connects the fixing portion 21 and the lip tip portion 23. .. Each of the outer peripheral surface 26 and the inner peripheral surface 27 of the lip base portion 22 has a tapered shape whose diameter decreases toward the lip tip portion 23 side. With reference to the fixed portion 21, the lip base portion 22 and the lip tip portion 23 are provided so as to extend to one side in the axial direction (left side in FIG. 1). The seal body 20 shown in FIG. 1 further has an auxiliary lip 29 extending from the fixing portion 21 to the other side in the axial direction. The sealing device 10 shown in FIG. 1 has an annular spring 19 attached to the outer peripheral side of the lip tip portion 23, and the spring 19 has a function of tightening the lip tip portion 23 to the shaft 5.

The shaft 5 is assembled so as to be concentric with the cylindrical inner peripheral surface 6a of the housing 6, and the sealing device 10 which is annular around these axes is attached to the annular space 4. In this state, the lip tip portion 23 has a predetermined tightening allowance S and is in contact with the shaft 5. The shaft 5 may be eccentric or tilted, which causes the tightening allowance S to increase or decrease, and the sealing performance of the sealing device 10 changes. Therefore, in order to compensate for this change (decrease) in the sealing performance, the sealing device 10 of the present embodiment detects, eccentricizes, or tilts the deformation of the seal body 20 that occurs according to the eccentricity or inclination of the shaft 5. It has a function of positively following the seal body 20 (lip tip portion 23) to the shaft 5.

The sealing device 10 is provided with a first electrode 31 and a second electrode 32 on the sealing body 20 in order to have the above-mentioned functions. Further, as shown in FIG. 2, the sealing device 10 includes a control unit 50 connected to the electrodes 31 and 32 via a signal line L. FIG. 2 is a block diagram of the sealing device 10.

In FIG. 1, the first electrode 31 has a sheet shape and is provided over the entire circumference along the outer peripheral surface 26 of the lip base 22. The second electrode 32 has a sheet shape and is provided over the entire circumference along the inner peripheral surface 27 of the lip base 22. The first electrode 31 is an electrode provided on the housing 6 side, and the second electrode 32 is an electrode provided on the shaft 5 side. As shown in FIG. 1, the second electrode 32 is provided on the lip base 22 closer to the fixing portion 21 than the first electrode 31. The electrodes 31 and 32 are formed in a thin film shape and are adhered to the lip base 22 in this embodiment. The thickness of the electrodes 31 and 32 can be, for example, 0.1 mm.

The first electrode 31 and the second electrode 32 are made of rubber containing a conductive material, have conductivity, and have flexibility (elasticity). Therefore, the electrodes 31 and 32 can be expanded and contracted, and can be elastically deformed (following) together with the lip base 22 in a state of being attached to the lip base 22. The electrodes 31 and 32 of the present embodiment are made of silicon rubber containing conductive carbon black. For example, conductive carbon black having a particle diameter (average particle diameter) of 55 nanometers is used in an amount of 5 to 10 phr. It is obtained by blending with silicon rubber in proportion.

The hardness of the electrodes 31 and 32 (durometer type A) is about A20 to 40. The hardness of the seal body 20 (durometer type A) is about A60 to 70, and the electrodes 31 and 32 are lower in hardness than the seal body 20.
As described above, in the sealing device 10 of the present embodiment, the electrodes 31 and 32 having flexibility on one surface side (housing 6 side) and the other surface side (shaft 5 side) of the lip base 22 of the sealing body 20 are obtained. Is provided.

FIG. 3A is an explanatory view of the first electrode 31, and FIG. 3B is an explanatory view of the second electrode 32. The first electrode 31 and the second electrode 32 each have a tapered shape in a state of being attached to the lip base 22, but in FIG. 3, these electrodes 31 and 32 are flat in order to facilitate explanation. It is expanded to and further shown as a straight line. As shown in this figure, the first electrode 31 is divided into a plurality of portions along the circumferential direction by the insulating material 33. Further, in the present embodiment, the first electrode 31 is divided into a plurality of directions by the insulating material 33 also in the direction orthogonal to the circumferential direction (axial direction). Each matrix formed by forming the insulating material 33 in a grid pattern and being surrounded by the insulating material 33 serves as an electrode portion 31a. The first electrode 31 is composed of the electrode portion 31a and the insulating material 33. The adjacent electrode portions 31a and 31a are in an insulated state. The length of one side of each matrix, that is, one side of the electrode portion 31a can be set to about 5 mm. The insulating material 33 may have non-conductive property, and in this embodiment, it is made of a string-like member (thread) made of nylon (resin).

The second electrode 32 also has the same configuration as the first electrode 31, and is divided into a plurality of parts by the insulating material 33 along the circumferential direction and the orthogonal direction thereof. The second electrode 32 is composed of the plurality of electrode portions 32a and the insulating material 33. Since the second electrode 32 has the same configuration as the first electrode 31, detailed description of the second electrode 32 will be omitted.

In FIG. 2, the control unit 50 has a power supply control unit 51 and a detection control unit 52 as functional units. Specifically, although not shown, the control unit 50 includes a storage unit including an arithmetic processing unit (CPU), a memory, and the like, and the arithmetic processing unit executes a computer program stored in the storage unit. By doing so, the functions of the power supply control unit 51 and the detection control unit 52 are exhibited. The control unit 50 is provided outside the annular space 4 (see FIG. 1).

The power supply control unit 51 has a function of supplying electric power from the power supply 60 to the first electrode 31 and the second electrode 32, and further adjusts the magnitude of the voltage applied between the electrodes 31 and 32. The power supply 60 may be provided in the control unit 50, or may be a device different from the control unit 50. The applied voltage (voltage value) is a value much larger than the detection voltage described later, and can be, for example, several thousand volts.

Since the first electrode 31 is partitioned into a plurality of partitions (see FIG. 3A), each of the plurality of partitioned electrode portions 31a and the control unit 50 are connected via a signal line L, and the electrode portions It is possible to apply a different voltage for each 31a. Further, similarly to this, since the second electrode 32 is also partitioned into a plurality of partitions (see FIG. 3B), each of the plurality of partitioned electrode portions 32a and the control unit 50 are connected via the signal line L. It is connected, and it is possible to apply a different voltage to each of the electrode portions 32a. As described above, the power supply control unit 51 has a function of adjusting and applying a voltage (DC voltage) between the first electrode 31 and the second electrode 32.

Here, in FIG. 1, when the shaft 5 having the tightening allowance S and in contact with the lip tip portion 23 is eccentric or the inclination of the shaft 5 changes, the seal body 20 (particularly the lip base portion 22) becomes elastic. Deform. Since the electrodes 31 and 32 are provided on both sides of the lip base 22 as described above, when the lip base 22 is deformed, the distance between the electrodes 31 and 32 changes and the capacitance between these electrodes 31 and 32 changes. To do.

Therefore, as shown in FIG. 2, the detection control unit 52 of the control unit 50 is connected to each of the electrodes 31 and 32, and the capacitance between the electrodes 31 and 32 located opposite to each other with the lip base 22 in between. When is changed, the voltage value (potential) between them changes. A minute voltage for detection is applied between the electrodes 31 and 32. Therefore, the detection control unit 52 detects a change in the voltage value based on the change in capacitance. Each of the electrodes 31 and 32 is connected to the detection control unit 52 via an amplifier 53, the voltage value is amplified, and the detection control unit 52 detects the change.

Further, since each of the first electrode 31 and the second electrode 32 is partitioned into a plurality of partitions (see FIGS. 3A and 3B), the plurality of partitioned first electrode portions 31a and the plurality of second electrode portions are partitioned. Each of the 32a and the control unit 50 are electrically connected to detect and control a change in the voltage value due to a change in capacitance between the predetermined first electrode portion 31a and the predetermined second electrode portion 32a. The unit 52 can be detected. As described above, the detection control unit 52 has a function of acquiring a voltage value as an electric signal from each of the first electrode 31 and the second electrode 32 and detecting a change in the electric signal (voltage value). ..
The minute voltage for detection by the detection control unit 52 and the large voltage for deformation by the power supply control unit 51 are applied at different timings. Further, the electric signal acquired by the detection control unit 52 may be a current value instead of a voltage value.

As a function of the sealing device 10 having the above configuration, a specific example of a function for positively following the sealing body 20 (lip tip portion 23) to the shaft 5 that is eccentric or tilted will be described.
FIG. 4 is an image view of the shaft 5 and the sealing device 10 when viewed from a direction parallel to the center line of the sealing device 10. As shown in FIG. 4, it is assumed that the shaft 5 is displaced downward at the position where the sealing device 10 is provided. In FIG. 4, the axis 5 before displacement is shown by a chain double-dashed line. When the shaft 5 is displaced downward, the tightening margin S (see FIG. 5) of the lip tip portion 23 with respect to the shaft 5 becomes smaller in the upper portion T of the seal body 20 of the sealing device 10 as compared with the normal state of FIG. ..

In FIG. 3A, the region corresponding to the upper portion T of the first electrode 31 is the region indicated by the arrow Q1, and in FIG. 3B, the region of the second electrode 32 described above. The portion corresponding to the upper portion T is the region indicated by the arrow Q2.

As shown in FIGS. 4 and 5, when the shaft 5 is displaced downward, the upper portion T of the seal body 20 is deformed downward by the elastic restoring force as compared with before the displacement. In the present embodiment, the fixing portion 21 of the seal main body 20 is hardly deformed because it is fixed to the core member 11, but the lip base portion 22 and the lip tip portion 23 are displaced downward. At this time, in the upper portion T of the seal body 20, the second electrode 32 is provided closer to the fixed portion 21 and the displacement is small, whereas the first electrode 31 is provided closer to the lip tip portion 23. Therefore, the displacement becomes large, and the distance between the first electrode 31 and the second electrode 32 becomes smaller than that before the displacement of the shaft 5. Therefore, the capacitance between the electrodes 31 and 32 in the upper portion T of the seal body 20 becomes smaller, and the electrode portion 31a existing in the region indicated by the arrow Q1 in the first electrode 31 shown in FIG. 3 (A). The detection control unit 52 can detect a change in the voltage value between the second electrode 32 and the electrode portion 32a existing in the region indicated by the arrow Q2 in the second electrode 32 shown in FIG. 3B. That is, it is possible to detect a change in the tightening allowance S of the lip tip portion 23 with respect to the shaft 5.

When the shaft 5 is displaced downward as shown in FIGS. 4 and 5, the tightening allowance S with respect to the shaft 5 may become small in the upper portion T of the seal body 20, and the sealing performance may deteriorate. Therefore, next, the power supply control unit 51 applies a voltage to the predetermined electrode portions 31a, 32a in order to recover the tightening allowance S with respect to the shaft 5 in the upper portion T, thereby causing the electrodes 31, 32. The lip base 22 including the above is made to function as a dielectric actuator, and the lip base 22 in the upper portion T of the seal body 20 is deformed toward the shaft 5. The seal body 20 after being deformed by functioning as a dielectric actuator in this way is shown by a two-dot chain line in FIG.
For example, the power supply control unit 51 has an electrode portion 31a existing in the region indicated by the arrow Q1 in the first electrode 31 shown in FIG. 3A and an arrow in the second electrode 32 shown in FIG. 3B. Control is performed to apply a predetermined voltage to the electrode portion 32a existing in the region indicated by Q2 (that is, control to obtain a predetermined potential difference). As a result, the tightening allowance S of the lip tip portion 23 with respect to the downwardly displaced shaft 5 can be brought close to (returned) to the state before the displacement, and the deterioration of the sealing performance is eliminated.

Due to the deformation of the seal body 20 by such a dielectric actuator, the capacitance between the electrodes 31 and 32 in the upper portion T approaches the state before the displacement of the shaft 5. According to the above description, the capacitance between the electrode portions 31a and 32a included in each of the pair of electrodes 31 and 32 arranged so as to sandwich a part of the lip base 22 in the circumferential direction (for example, the upper portion T). However, the voltage applied to these electrodes 31 and 32 may be controlled so as to be constant before and after the displacement (or before and after tilting) of the shaft 5, so that the tightening allowance even if the shaft 5 is displaced (tilted). S can be kept constant.

The deformation of the seal body 20 will be further described. In the present embodiment (see FIG. 5), the second electrode 32 is provided on the inner peripheral surface 27 of the lip base 22, but the seal body 20 is more than the first electrode 31 provided on the outer peripheral surface 26 thereof. It is provided closer to the fixed portion 21 side of the above. Since the fixing portion 21 is fixed to the core member 11, the second electrode 32 provided closer to the fixing portion 21 is affected by the deformation of the seal body 20 as compared with the first electrode 31. Hard to receive (that is, hard to deform). Therefore, as described above, a voltage is applied to the electrode portion 31a of the first electrode 31 and the electrode portion 32a of the second electrode 32 located in the upper portion T of the seal body 20, and these electrode portions 31a in the lip base 22 When the lip base 22 is compressed so that the distance between the and 32a becomes small, the inner peripheral surface 27 side to which the second electrode 32 is attached becomes the fixed side, and the outer peripheral surface 26 side to which the first electrode 31 is attached becomes the displacement side. The lip base 22 can be curved and deformed in the direction in which the lip tip 23 is reduced in diameter by the compression. Due to this curved deformation, the lip tip portion 23 can be brought closer to the shaft 5 side, and the tightening allowance S can be secured.

As described above, according to the sealing device 10 of the present embodiment, the dielectric actuator is formed by the first electrode 31, the second electrode 32, and a part between both electrodes 31 and 32 in the lip base 22. Will be done.

Then, this dielectric actuator can be used as a sensor, and as described above, it is possible to detect a decrease (or increase) in the tightening allowance S of the lip tip portion 23 with respect to the shaft 5. That is, since the capacitance between the electrodes 31 and 32 changes when the seal body 20 is deformed, the deformation mode of the seal body 20 is detected by detecting the change in the electric signal (voltage value) based on this change. It becomes possible. For this detection, the sealing device 10 includes a detection control unit 52, and the detection control unit 52 detects a change in the voltage value as a change in the electric signal from the first electrode 31 and the second electrode 32.

Further, the dielectric actuator configured as described above can be used as an actuator for forcibly elastically deforming the seal body 20. That is, the lip base 22 can be deformed by applying a voltage (potential difference) between the electrodes 31 and 32. For this purpose, the sealing device 10 includes a power supply control unit 51, and the power supply control unit 51 adjusts and applies a voltage between the first electrode 31 and the second electrode 32. By applying a voltage of a predetermined magnitude to the electrodes 31 and 32, the lip base 22 can be deformed and the lip tip 23 can follow the eccentricity and inclination of the shaft 5.

It should be noted that the voltage applied to the electrodes 31 and 32 in order to make the lip tip portion 23 follow the shaft 5 is used as a sensor to change the electric signal (voltage value) obtained by using the dielectric actuator (that is, the seal body). It may be determined based on the amount of deformation of 20). That is, when the change in the electric signal (voltage value) obtained by using it as a sensor is large, a large voltage is applied to the electrodes 31 and 32 to greatly deform the seal body 20 and the tightening allowance with respect to the shaft 5. Let S be a desired value.

As described above, according to the sealing device 10 having each of the above configurations, it is possible to improve the sealing performance. Further, since the electrodes 31 and 32 have flexibility even when the shaft 5 is rotating in a normal state where the inclination and eccentricity are not large, the seal body 20 is provided with respect to the shaft 5. The original followability is not impaired.

Then, as described above, each of the first electrode 31 and the second electrode 32 is divided into a plurality of regions along the circumferential direction by the insulating material 33. According to this configuration, the partitioned electrode portions 31a and 32a can be selectively used. That is, by selecting the electrode portions 31a and 32a for which the voltage is to be detected, it is possible to detect at which position in the circumferential direction (for example, the upper position T) the seal body 20 is deformed, which is more precise. It is possible to detect the deformation mode of the seal body 20. Further, by selecting the electrode portions 31a and 32a to be applied, the seal body 20 is forcibly elastically deformed at an arbitrary position in the circumferential direction, and the seal body 20 is more strictly (partially) deformed. It can be deformed, and a desired tightening allowance S for the shaft 5 can be secured.

Further, in the present embodiment, each of the first electrode and the second electrode 32 is divided into a plurality of regions along the direction (axial direction) from the fixing portion 21 to the lip tip portion 23 by the insulating material 33. By partitioning in this way, by selecting the electrode portions 31a and 32a to be the voltage detection target, it is possible to more accurately detect the deformation mode of the seal body 20, and the target to be applied. By selecting the electrode portions 31a and 32a to be formed, it is possible to deform the seal body 20 more strictly (more partially).

In the above description, in order to prevent a decrease in the tightening allowance S generated between the lip tip portion 23 and the shaft 5 in the upper portion T of the seal body 20, the lip base portion 22 in the upper portion T is set to the shaft 5 side. The case of forcibly deforming toward is described. However, in the lower portion B (see FIG. 4) opposite to this, the tightening allowance S increases due to the eccentricity of the shaft 5. Therefore, in the lower portion B, the seal body 20 and the electrodes 31, 32 are made to function as dielectric actuators (similar to the case described above), and a voltage is applied to the predetermined electrode portions 31a, 32a, and below this. The lip base 22 in the side portion B may be forcibly deformed (curved) in the direction away from the shaft 5. As a result, the tightening allowance S does not become excessive, heat generation and abnormal wear can be prevented, which contributes to a longer life.

As described above, as a means for improving the sealing performance, the electrodes 31 and 32 may be provided on the sealing body 20, so that the degree of freedom in design is high. That is, even if the size of the shaft 5, the size of the annular space 4, or the form of the seal body 20 is changed, the sealing performance can be improved by providing the electrodes 31 and 32 in the corresponding sizes and arrangements. It will be possible.

The embodiments disclosed as described above are exemplary in all respects and are not restrictive. That is, the sealing device of the present invention is not limited to the illustrated form, and may be another form within the scope of the present invention.
In the above embodiment, the case of the oil seal having the spring 19 has been described, but a sealing device having another embodiment may be used. Further, although the sealing device of the present invention has been described for a wind power generator, it can also be applied to other devices. For example, although not shown, it can be applied to a sealing device provided between a rotating shaft of a servomotor and a housing. The servo motor may accelerate suddenly. In this case, a gap is likely to occur between the servo motor and the shaft due to the stick-slip phenomenon. By applying the sealing device of the present invention, this gap is eliminated and the sealing performance is improved. It becomes possible to increase.

5: Shaft 6: Housing (outer member) 6a: Cylindrical inner peripheral surface 10: Sealing device 11: Core member 20: Seal body 21: Fixing part 22: Lip base 23: Lip tip 31: First electrode 32: Second Electrode 33: Insulation material 51: Power supply control unit 52: Detection control unit

Claims (5)

A sealing device provided between an outer member having an inner peripheral surface of a cylinder and an axially inner shaft of the inner peripheral surface of the cylinder.
An annular core member attached to the outer member and an annular seal body having elasticity and fixed to the core member are provided.
The seal body has a fixing portion fixed to the core member, a lip tip portion that can come into contact with the shaft, and a lip base portion that connects the fixing portion and the lip tip portion.
Flexible electrodes are provided on one side and the other side of the lip base .
A sealing device further comprising a detection control unit for detecting a change in an electric signal from the electrode on one side and the electrode on the other side . A sealing device provided between an outer member having an inner peripheral surface of a cylinder and an axially inner shaft of the inner peripheral surface of the cylinder.
An annular core member attached to the outer member and an annular seal body having elasticity and fixed to the core member are provided.
The seal body has a fixing portion fixed to the core member, a lip tip portion that can come into contact with the shaft, and a lip base portion that connects the fixing portion and the lip tip portion.
Flexible electrodes are provided on one side and the other side of the lip base.
A sealing device in which the electrodes are divided into a plurality of electrodes along the circumferential direction by an insulating material. A sealing device provided between an outer member having an inner peripheral surface of a cylinder and an axially inner shaft of the inner peripheral surface of the cylinder.
An annular core member attached to the outer member and an annular seal body having elasticity and fixed to the core member are provided.
The seal body has a fixing portion fixed to the core member, a lip tip portion that can come into contact with the shaft, and a lip base portion that connects the fixing portion and the lip tip portion.
Flexible electrodes are provided on one side and the other side of the lip base.
A sealing device in which the electrodes are partitioned by an insulating material in a plurality of directions along the direction from the fixing portion to the lip tip portion. The sealing device according to any one of claims 1 to 3 , further comprising a power supply control unit that adjusts and applies a voltage between the electrode on one side and the electrode on the other side. The one side is the inner peripheral surface side of the lip base, and the other side is the outer peripheral surface side of the lip base.
The sealing device according to any one of claims 1 to 3 , wherein the electrode on the other side of the electrode on the one side is provided closer to the fixing portion side.

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