JP2021148251A - Bearing seal device - Google Patents

Abstract

To provide a bearing seal device which can prevent occurrence of failure in a rolling bearing due to a torque loss caused by an improper tightening margin and deterioration in a seal member, by detecting increase or decrease in a tension force of the seal member, irrespective of the structure and the size of the rolling bearing.SOLUTION: A bearing seal device 2 seals a bearing space 6 of a rolling bearing 1 which includes an inner ring 3, an outer ring 4, and a plurality of rolling elements 5 rolling between an inner ring raceway surface and an outer ring raceway surface. The bearing seal device includes: a seal member 7 that is constituted by conductive rubber, is fixed to one raceway ring out of the outer ring and the inner ring, and seals the bearing space 6 by coming into slide-contact by having a tightening margin on the other raceway ring; a voltage application part 8 that applies a voltage to the seal member 7; and a detection part 9 that detects an electric parameter according to the deformation of the seal member 7 when a voltage is applied to the seal member 7.SELECTED DRAWING: Figure 1

Description

The present invention relates to a bearing sealing device that seals the bearing space of a rolling bearing.

In rolling bearings used for rotary support of various machines and devices, sealing members are placed on both sides of the rolling bearings, and a lubricant such as grease is sealed inside the rolling bearings to prevent foreign matter from entering from the outside. At the same time, sealed rolling bearings that prevent grease from leaking from the inside are widely used.

General sealing members for sealed rolling bearings include an outer ring fitting section that fits into the outer ring, which is one of the components of the rolling bearing, and a main lip section that prevents lubricant from leaking from the space inside the bearing. It has a dust strip portion that prevents foreign matter from entering from the outside of the bearing space. Further, as the sealing member, a molded body of an elastic material such as rubber having elasticity is often used. The outer ring fitting portion of the seal member is fitted and fixed in the seal groove of the outer ring. In general, the shape, rigidity, and the like of each of the above lip portions are set so as to exert an appropriate tense force according to the intended use and usage conditions.

However, the tension may increase or decrease due to improper mounting tightening allowance, pressure increase in the space inside the bearing due to temperature rise during bearing rotation, expansion or contraction of the seal member due to aging deterioration, and the like. Increased tension can cause problems such as bearing rotation torque, temperature rise, and abnormal wear. On the other hand, when the tense force is reduced, foreign matter may be mixed in from the outside and grease may leak easily. In many cases, it turns out that the bearing device has deteriorated over time since it became defective.

Conventionally, as for the deterioration detection of the seal member used for the cylinder head, a method of detecting the seal tension force and determining the degree of deterioration of the seal member has been proposed (see Patent Document 1). Further, as in Patent Document 2, a conductive rubber obtained by curing a mixture of a magnetic mixed fluid containing a magnetic fluid and nickel particles and a natural rubber material in the presence of a magnetic field is used as a tactile sensor. A method to do so is also proposed. In this method, a voltage is applied to a pair of electrodes in contact with the tactile sensor unit, and the contact force and the surface are based on the change in current flowing between the electrodes when an object is brought into contact with the surface of the tactile sensor unit. It detects the properties.

Japanese Unexamined Patent Publication No. 2018-155253 Japanese Unexamined Patent Publication No. 2013-101080

In the deterioration detection of the seal member of Patent Document 1, the pressure-sensitive conductive rubber whose conductivity changes according to the pressure is used as a detection device and is installed in the cylinder head in a state adjacent to the seal member. However, the detection device can only detect either an increase or a decrease in the tense force depending on the place where the device is installed. Further, in the case of a small device such as a small bearing device, it is considered difficult to install an internal detection device because each part is composed of minute members and the space margin is limited.

The present invention has been made in view of the above problems, and regardless of the structure and size of the rolling bearing, it is possible to detect an increase or decrease in the tense force of the sealing member, thereby causing a torque cross due to an improper tightening allowance. An object of the present invention is to provide a bearing sealing device capable of preventing the occurrence of a defect of a rolling bearing due to deterioration of a sealing member.

The bearing sealing device of the present invention includes an inner ring having an inner ring raceway surface on the outer circumference, an outer ring having an outer ring raceway surface on the inner circumference, and a plurality of rolling elements rolling between the inner ring raceway surface and the outer ring raceway surface. A bearing sealing device for sealing the bearing space of a rolling bearing, wherein the bearing sealing device is made of a conductive rubber material and is fixed to one of the outer ring and the inner ring, and the other. A seal member that seals the bearing space by sliding contact with the raceway ring with a tightening allowance, a voltage application portion that applies a voltage to the seal member, and the seal member when a voltage is applied to the seal member. It is characterized by having a detection unit that detects an electrical parameter according to the deformation of the bearing.

The voltage applying portion is characterized in that it is provided on a raceway ring to which the sealing member is fixed.

The voltage application unit applies a voltage through a pair of electric wires connected to the seal member, and in the seal member, one of the pair of electric wires is a raceway ring to which the seal member is fixed. The electric wire is connected to the end portion on the side, and the other electric wire is connected to the lip portion existing at the end portion on the raceway ring side with which the sealing member is in sliding contact.

The seal member has a main lip portion located on the bearing space side and a dust strip portion located on the outer side of the bearing from the main lip portion at the end portion on the raceway ring side with which the seal member is in sliding contact. The other electric wire is connected to the dust strip portion as the lip portion.

The bearing sealing device is characterized by having a control panel capable of switching between an automatic mode in which a voltage is automatically applied by the voltage applying unit and a manual mode in which a voltage is applied by a user operation.

The bearing sealing device of the present invention is made of a conductive rubber material, is fixed to one of the outer ring and the inner ring, and is slidably contacted with the other race ring with a tightening allowance to provide a bearing space. It has a seal member for sealing, a voltage application unit for applying a voltage to the seal member, and a detection unit for detecting electrical parameters according to deformation of the seal member when a voltage is applied to the seal member. Since the member itself has a role as a sensor and no separate member is required, it is possible to detect an increase or decrease in the tense force of the sealing member regardless of the structure and size of the rolling bearing. As a result, it is possible to detect whether or not the tightening allowance at the time of mounting the inner ring is appropriate, and it is possible to grasp the aged deterioration such as hardening and softening of the seal member due to long-term use. As a result, it is possible to prevent the occurrence of a torque cloth due to an improper tightening margin and a defect of the rolling bearing due to deterioration of the seal member.

Since the voltage application part is provided on the raceway ring to which the seal member is fixed and is located on the same side as the fixed side of the seal member, stable electrical parameters can be obtained and the tension of the seal member can be obtained with higher accuracy. Can be measured. As a result, it contributes to prevent the occurrence of torque cloth and defects.

The voltage application portion applies a voltage through a pair of electric wires connected to the seal member, and in the seal member, one of the pair of electric wires is attached to the end portion on the raceway ring side to which the seal member is fixed. Since the other electric wire is connected to the lip portion existing at the end on the raceway ring side where the seal member is in sliding contact, the tense force due to the deformation of the entire seal member can be measured, and the state of the seal member can be grasped more accurately. can.

The seal member has a main lip portion located on the bearing space side and a dust strip portion located on the outer side of the bearing from the main lip portion at the end portion on the raceway ring side with which the seal member is in sliding contact, and the other. Since the electric wire is connected to the dust strip portion as a lip portion, the tense force of the sealing member can be easily detected while ensuring the sealing property of the sealing member.

The bearing sealing device has a control panel that can switch between an automatic mode in which a voltage is automatically applied by a voltage applying unit and a manual mode in which a voltage is applied by a user operation. Therefore, for example, in the manual mode, when the inner ring is mounted, the sealing member The tightening allowance can be confirmed, and in the automatic mode, the deterioration status of the seal member can be regularly grasped. In this way, each mode can be used properly according to the situation.

It is sectional drawing of the sealed type rolling bearing provided with a bearing sealing device. It is sectional drawing of the sealing member which a bearing sealing device has. It is a top view of the sealed rolling bearing seen from the axial direction. It is the schematic of the conductive rubber part which shows the principle of detecting a tension force.

An example of an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an axial cross-sectional view of an example of a sealed rolling bearing to which the bearing sealing device of the present invention is applied. As shown in FIG. 1, the sealed rolling bearing 1 rolls between an inner ring 3 having an inner ring raceway surface on the outer circumference, an outer ring 4 having an outer ring raceway surface on the inner circumference, and an inner ring raceway surface and an outer ring raceway surface. A bearing sealing device 2 for sealing an annular bearing space 6 between the inner ring 3 and the outer ring 4 is provided. The bearing space 6 is filled with grease (not shown) and lubricated by grease lubrication. The sealed rolling bearing 1 is an inner ring rotation type bearing, in which the inner ring 3 is a rotary raceway ring and the outer ring 4 is a fixed raceway ring. The bearing sealing device 2 corresponds to the bearing sealing device of the present invention.

As shown in FIG. 1, the bearing sealing device 2 is arranged at the axial end portion of the bearing space 6, and includes a sealing member 7 that seals the bearing space 6, a voltage applying portion 8 that applies a voltage to the sealing member 7. It has a detection unit 9 that detects electrical parameters associated with voltage application. In FIG. 1, the detection unit 9 is provided in a control panel 12 capable of performing various ON / OFF operations. The voltage application unit 8 can communicate with the control panel 12 by wire or wirelessly. In FIG. 1, the seal member 7 is fixed to the outer ring 4 and slides on the inner ring 3 with a tightening allowance. The seal member 7 may be fixed to the inner ring 3.

The voltage application unit 8 applies a predetermined voltage to the seal member 7 via a pair of electric wires 10 connected to the seal member 7. For example, a constant voltage in the range of 5V to 10V is applied. In the seal member 7, one of the pair of electric wires 10a is connected to the end on the outer ring side to which the seal member 7 is fixed, and the other electric wire 10b is the end on the inner ring side with which the seal member is in sliding contact. It is connected to the lip portion 11 existing in. In FIG. 1, the voltage applying portion 8 is provided on the axial side surface of the outer ring 4 to which the seal member is fixed. In this case, the voltage applying portion 8 may be provided on either of the raceway wheels, but it is preferable to provide the voltage application portion 8 on the raceway ring side to which the seal member is fixed. Further, it is more preferable that the raceway ring is a fixed raceway ring. This is because when the voltage applying portion 8 is provided on the rotating raceway ring, the voltage applying portion 8 may come off due to centrifugal force when the bearing rotates.

Of the pair of electric wires 10, the electric wire 10a connected to the end of the seal member 7 on the outer ring side is a positive electric wire and is connected to the lip portion 11 existing at the end of the seal member 7 on the inner ring side. The electric wire 10b is an electric wire on the minus side. The electric wire 10b is connected to the dust strip portion 14 of the lip portion 11. The positive and negative relationships of the electric wires 10a and 10b may be the opposite of the above.

In the lip portion 11, since the dust strip portion 14 exists on the outside of the seal member 7, it can be easily connected. When the structure of the lip portion 11 is different from the structure shown in FIG. 1, the electric wire may be connected to the main lip portion, the dust strip portion, or any other lip portion.

The detection unit 9 detects an electrical parameter corresponding to the deformation of the seal member 7 when a voltage is applied to the seal member 7. The electrical parameter is, for example, a current value. The detection unit 9 converts the electric parameter into the tense force based on, for example, an analysis program for the relationship between the detected electric parameter and the tense force of the seal member. The tense force calculated by the detection unit 9 is displayed on a display unit (not shown) provided in the control panel 12. The electrical parameters may be displayed on the display unit.

Further, the bearing sealing device 2 has a control panel 12 capable of switching between an automatic mode in which a voltage is automatically applied by the voltage applying unit 8 and a manual mode in which a voltage is applied by a user operation. As a result, the tense force of the seal member 7 can be detected at a desired timing according to the purpose, etc., and the tightening allowance of the seal member when the inner ring is attached can be confirmed, and the state of aging deterioration of the seal member can be grasped. Can be done. Further, in the control panel 12, in addition to the above-mentioned switching between the automatic mode and the manual mode and the display of the tense force, a function (including the display) for predicting the deterioration time of the seal member from the past information acquired over time, and It may be provided with an automatic alarm alarm function or the like. By providing an automatic alarm alarm function or the like, the user of the bearing sealing device of the present invention can know an appropriate replacement time of the sealing member before the device is damaged.

FIG. 2 describes a sealing member included in the bearing sealing device of FIG. FIG. 2 is a cross-sectional view of a part of the seal member and the inner ring. As shown in FIG. 2, the sealing member 7 is composed of a conductive rubber portion 15 made of a conductive rubber material and a core metal portion 16 which is a metal member. The core metal portion 16 is, for example, a disk-shaped core metal formed by pressing a cold-rolled steel plate (JIS standard SPCC type, etc.), and the conductive rubber portion 15 is integrated with the core metal portion 16. Is vulcanized and bonded to. The conductive rubber portion 15 includes a main lip portion 13 formed by bifurcating the tip at the end portion on the inner ring 3 side, and a dust strip portion 14 located on the outer side of the bearing with respect to the main lip portion 13. Has. The seal member 7 is fitted into a seal groove on the inner circumference of the end of the outer ring via the conductive rubber portion 15, and the conductive rubber material 15 has a substantially U-shaped cross section formed on the outer periphery of the end of the inner ring 3. It is in direct sliding contact with the seal groove 19. Specifically, the main lip portion 13 is in contact with the inclined sliding surface 20 of the seal groove 19, and the dust strip portion 14 is in contact with the small diameter portion (ridge portion of the seal groove) 21 of the inner ring 3. .. The main lip portion 13 and the dust strip portion 14 are mounted with a predetermined tightening allowance, and are elastically deformed at the time of mounting and come into contact with the inner ring 3.

The conductive rubber portion 15 in the sealing member 7 is a rubber material having an insulating property mixed with conductive particles in a predetermined ratio. Examples of the rubber material include natural rubber, synthetic natural rubber, styrene butadiene rubber, butadiene rubber, chloroprene rubber, butyl rubber, nitrile rubber, ethylene / propylene rubber, fluororubber, acrylic rubber, urethane rubber, silicone rubber and the like. Examples of the conductive particles include nickel particles, copper particles, gold particles, silver particles, carbon powder, carbon black, carbon nanotubes, carbon nanohorns, graphene and the like. The shapes of the various particles described above are not limited to spheres, and can be freely selected from beads, fibers, columns, scales, flat plates, konpeito, and the like.

In addition to the conductive particles, a magnetic fluid can be further added to the conductive rubber portion 15. In this case, as the rubber composition, it is preferable to use a composition containing a magnetic fluid, nickel particles (conductive particles), and a rubber material. The magnetic fluid contains magnetite particles as a magnetic material. By molding this rubber composition into a predetermined shape and curing it under the application of a magnetic field, the nickel particles are aggregated and formed oriented in the direction of application of the magnetic field. Thereby, the sensitivity to the tense force due to the deformation can be increased.

The average particle size of the various particles blended in the conductive rubber portion 15 is preferably in the range of 1 to 100 μm, more preferably in the range of 1 to 20 μm, and in the range of 1 to 5 μm. Is even more preferable. When the average particle size is smaller than 1 μm, a large number of particles need to be in contact with each other in order to form a conduction path, which may reduce the sensitivity. Further, when the average particle size is larger than 100 μm, the conductivity at the time of deformation is likely to change, but the characteristics are likely to fluctuate in each production lot due to the variation in the presence of particles inside the conductive rubber portion 15. There is a risk of becoming. Here, the average particle size means a number average particle size in observation using an electron microscope.

When carbon nanotubes are used as the conductive particles, the diameter is preferably in the range of 100 to 500 nm, and the length is preferably in the range of 1 to 10 μm or less. With such a diameter and length, the change of the electrical parameter with respect to the deformation of the sealing member becomes smoother, and the tension force can be measured more accurately.

Further, the conductive rubber portion 15 may have a laminated structure in which a conductive paint is applied to the surface of an insulating resin molded body. In that case, the type of resin can be freely selected as long as the resin molded body has a predetermined elasticity. As a result, the amount of expensive conductive rubber used can be reduced, which contributes to cost reduction. Further, the insulating material may be arranged so as to surround the entire conductive rubber portion 15. As a result, it is possible to prevent a current from flowing to the core metal portion 16, the raceway ring, and the like, and it is possible to prevent a decrease in detection accuracy. Further, in order to prevent the current from flowing through the raceway ring, a ceramic rolling element may be used.

FIG. 3 shows a plan view of the bearing sealing device 2 provided on the sealed rolling bearing 1 as viewed from the axial direction of the bearing. As shown in FIG. 3, the positive electric wire 10a extending from the voltage application portion 8 is connected to the end portion of the seal member 7 on the outer ring 4 side. Further, the negative electric wire 10b extending from the voltage application portion 8 is connected to the dust strip portion 14 on the inner ring 3 side with which the seal member 7 is in sliding contact. The positive electric wire 10a and the negative electric wire 10b extend parallel to each other from each terminal of the voltage applying portion 8 toward the bearing center side.

In FIG. 1, the connection position between the electric wire 10a and the end portion of the seal member 7 on the outer ring 4 side is from the tip end portion of the seal member 7 on the outer ring 4 side to about the middle of the core metal portion. Further, in FIG. 1, the electric wire 10a is connected to the conductive rubber portion of the portion overlapping the core metal portion in the axial direction. The connection position is preferably a portion from the tip portion on the outer ring 4 side to 0.4 T, and more preferably a portion up to 0.2 T, when the radial thickness of the seal member 7 is T (see FIG. 2). Is. On the other hand, the connection position between the electric wire 10b and the lip portion 11 existing on the inner ring 3 side of the seal member 7 is preferably the tip end portion of the seal member near the sliding contact portion between the dust strip 14 and the inner ring 3. The above two connection positions are preferable because the detection sensitivity of the tense force improves as the positional relationship includes the lip portion having the largest amount of deformation of the seal member 7 between them.

The method of connecting the electric wires to both ends of the sealing member 7 may be bonding with an adhesive or application of a metal paste. The adhesive may be an insulating adhesive or a conductive adhesive. In the case of an insulating adhesive, for example, it can be freely selected from epoxy-based, acrylic-based, silicone-based, elastomer-based, and the like. The conductive adhesive can be obtained by including, for example, a metal-based inorganic filler, a carbon-based filler, or the like in the insulating adhesive. As the metal paste, silver paste, copper paste, ITO paste, ATO paste and the like can be used.

Next, the detection principle of the present invention will be described with reference to FIG. FIG. 4A is a schematic view of a state in which the conductive rubber portion 15 composed of the conductive particles 17 and the rubber 18 is not subjected to an external force, and FIG. 4B is a schematic view in which the conductive rubber portion 15 applies an external force F. It is a schematic diagram of the state of receiving. As shown in FIG. 4A, when the conductive rubber portion 15 is not subjected to an external force and a voltage is applied from the voltage application portion (not shown), a predetermined current value which is an initial value can be obtained. Hereinafter, the above electrical parameters are also referred to as current values. Then, as shown in FIG. 4B, when the conductive rubber portion 15 receives an external force and the rubber is deformed, the current value changes. Specifically, when the seal member expands, the current increases, and when the seal member contracts, the current decreases. For example, in the case of the dust strip portion as shown in FIG. 1, the dust strip portion extends in the axial direction of the bearing due to an external force at the time of mounting.

Here, rubber is generally an insulator and does not have conductivity. However, by containing the conductive particles, the conductive particles come into contact with each other inside the rubber, and the conduction path is formed, so that the resistance of the conductive rubber portion is lower than the resistance of the rubber itself, and the conductivity becomes low. Express. In the case of the above example, the seal member tries to stretch, and the seal member is compressed by the inner ring and the outer ring. As a result, the contact points between the conductive particles increase, the resistance value decreases, and as a result, the current value increases. On the other hand, when the sealing member shrinks, the contact points between the conductive particles decrease, so that the resistance value increases and the current value decreases.

In the present invention, the relationship between the deformation of the conductive rubber portion and the current value is a proportional relationship. The larger the tightening allowance, the greater the tension because the conductive rubber portion is compressed and deformed. At that time, the current value increases as the contact points between the conductive particles increase. For example, when the conductive rubber portion expands due to aged deterioration and expands to increase the tightening allowance, the tense force increases and the current value increases. On the other hand, when the conductive rubber portion shrinks due to hardening or the like to reduce the tightening allowance, the tense force becomes smaller and the current value decreases. Therefore, by using the above relationship, the tense force can be grasped as a numerical value based on the detected current value.

Further, the initial value of the above-mentioned current value may be set with a state in which the seal member receives an external force as an initial value. For example, the current value when the sealing member has a predetermined tightening allowance as designed may be the initial value, that is, the initial value of the tension force. Further, as the method for detecting the tension force, another method may be selected as long as it conforms to the above-mentioned detection principle. For example, if the relationship between deformation and current value is not proportional due to the composition of the conductive rubber part or the shape of the sealing member, use an analysis formula according to the relationship between deformation and current value for each configuration. It may be configured to calculate the tense force.

Regarding the application of the voltage to the seal member for grasping the tension force, for example, the following two modes can be used depending on the purpose.
(1) When the purpose is to determine the correctness of the mounting tightening allowance when the inner ring is mounted The user switches to the manual mode on the control panel. In the manual mode, a constant voltage is applied to the seal member from the voltage application unit, and the user adjusts to an appropriate tightening allowance while checking the current value and / or the tense force displayed on the control panel.
(2) When the purpose is to detect the aged deterioration of the seal member The user switches to the automatic mode on the control panel in order to grasp the change in the tense force due to the aged deterioration of the conductive rubber part. The control panel gives a command to apply a voltage to the seal member to the voltage application unit at predetermined intervals, and the detection unit continuously acquires the current value and / or the increase / decrease data of the tension force. Further, the user sets the upper and lower limit values of the current value and / or the tension force on the control panel, and stops the rotation of the bearing when the upper and lower limit values are exceeded.

The bearing sealing device of the present invention is not limited to the above-described forms of FIGS. 1 to 4. For example, the bearing sealing device may be provided on both sides of both ends of the rolling bearing in the axial direction, or may be provided on only one side. Further, the shape of the lip portion may include a lip portion having other functions in addition to the main lip portion and the dust strip portion. Further, the electrical parameter is not limited to the current value, and for example, a resistance value can be used. In this case, the detection unit converts the resistance value into the tense force based on, for example, an analysis program for the relationship between the detected resistance value and the tense force of the seal member.

Further, although the ball bearing is illustrated as the rolling bearing in FIG. 1, the bearing sealing device of the present invention includes a cylindrical roller bearing, a conical roller bearing, a self-aligning roller bearing, a needle roller bearing, and a thrust cylindrical roller bearing other than the above. It can also be used in thrust conical roller bearings, thrust needle roller bearings, thrust self-aligning roller bearings, etc.

The bearing sealing device of the present invention can detect an increase or decrease in the tense force of the sealing member regardless of the structure and size of the rolling bearing. It can prevent the occurrence of defects and can be widely used as a bearing sealing device for sealed rolling bearings that seals the lubricant in the bearing space.

1 Sealed rolling bearing 2 Bearing sealing device 3 Inner ring 4 Outer ring 5 Rolling element 6 Bearing space 7 Sealing member 8 Voltage application part 9 Detection part 10, 10a, 10b Electric wire 11 Lip part 12 Control panel 13 Main lip part 14 Dustrip part 15 Conductive rubber part 16 Core metal part 17 Conductive particles 18 Rubber 19 Seal groove 20 Sliding surface 21 Small diameter part

Claims (5)

A bearing space of a rolling bearing including an inner ring having an inner ring raceway surface on the outer circumference, an outer ring having an outer ring raceway surface on the inner circumference, and a plurality of rolling elements rolling between the inner ring raceway surface and the outer ring raceway surface. A bearing sealing device that seals
The bearing sealing device is made of a conductive rubber material, is fixed to one of the outer ring and the inner ring, and is slidably contacted with the other race ring with a tightening allowance to form the bearing space. It has a seal member that seals the seal member, a voltage application unit that applies a voltage to the seal member, and a detection unit that detects an electrical parameter according to the deformation of the seal member when a voltage is applied to the seal member. Bearing sealing device as a feature. The bearing sealing device according to claim 1, wherein the voltage applying portion is provided on a raceway ring to which the sealing member is fixed. The voltage applying portion applies a voltage through a pair of electric wires connected to the sealing member.
In the seal member, one of the pair of electric wires is connected to the end on the raceway ring side to which the seal member is fixed, and the other electric wire is the end on the raceway ring side to which the seal member is in sliding contact. The bearing sealing device according to claim 1 or 2, wherein the bearing sealing device is connected to a lip portion existing in the portion. The seal member has a main lip portion located on the bearing space side and a dust strip portion located on the outer side of the bearing from the main lip portion at an end portion on the raceway ring side with which the seal member is in sliding contact. ,
The bearing sealing device according to claim 3, wherein the other electric wire is connected to the dust strip portion as the lip portion. The bearing sealing device has a control panel capable of switching between an automatic mode in which a voltage is automatically applied by the voltage applying unit and a manual mode in which a voltage is applied by a user operation. The bearing sealing device according to any one of the above items.

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