JP2014037878A - Rolling bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling bearing device 10 in which a bearing ring with a special width and shape is not required to use as a bearing ring 18 on a fixed side and a bearing ring 17 on a rotation side in a rolling bearing 11, and furthermore, a lubricating oil can be replenished into a lubricating oil tank 46 without removing the rolling bearing 11.SOLUTION: A rolling bearing device consists of a combination of a rolling bearing 11 and an oil feeder that at least comprises a lubricating oil tank 46, a pump for discharging a lubricating oil in the lubricating oil tank 46, a drive part, a power supply part and a control part. The oil feeder is mounted on a spacer 12 adjacent to the rolling bearing 11, and the lubricating oil tank 46 is formed with a flexible bag body 46a.

Description

  The present invention relates to a rolling bearing device used for machine tools, industrial machines, and the like, and more particularly to a rolling bearing device composed of a combination of a rolling bearing and an oil supply unit.

  Conventionally, a rolling bearing device in which an oil supply unit is incorporated in a rolling bearing is known (see Patent Document 1). In this rolling bearing device, an oil supply unit is mounted on the inner diameter surface of the stationary bearing ring among the bearing rings facing each other of the rolling bearing. The oil supply unit includes a lubricating oil tank that stores lubricating oil, a pump that discharges the lubricating oil in the lubricating oil tank into the bearing, and a generator that drives the pump. Means for adjusting the discharge amount by controlling the pump according to the conditions on the bearing side is provided.

  Further, the rolling bearing device disclosed in Patent Document 2 includes a similar oil supply unit.

  Further, in the rolling bearing device disclosed in Patent Document 3, a lubricating oil tank of an oil supply unit is detachably provided between a fixed raceway and a rotary raceway, and the housing of the oil supply unit is a lubricant. Also serves as a tank.

JP 2004-108388 A JP 2004-316707 A JP 2008-106900 A

  However, the conventional rolling bearing device including the oil supply unit has a structure in which the oil supply unit is disposed between the fixed-side raceway and the rotation-side raceway, and thus has the following problems.

  First, in order to incorporate a lubrication unit between the stationary bearing ring and the rotating bearing ring of the rolling bearing, the fixed bearing ring and the rotating bearing ring use special width and shape. It is necessary to use a standard bearing ring. For this reason, the management related to the production of the rolling bearing is complicated and expensive.

  Further, when lubricating oil is replenished to the lubricating oil tank of the oil supply unit, it is necessary to remove the entire rolling bearing from the spindle housing for machine tools and the like. Furthermore, since the housing of the oil supply unit also serves as a lubricating oil tank, it is necessary to take out the oil supply unit from the rolling bearing and replenish the lubricating oil after removing the rolling bearing, which takes time and effort.

  Further, since the housing of the oil supply unit also serves as a lubricating oil tank, a spare lubricating oil tank could not be prepared in advance.

  Therefore, the present invention eliminates the need for using a fixed-side raceway and a rotation-side raceway with special widths and shapes, and also removes the rolling bearing when refilling the lubricant tank. It is an object of the present invention to provide a rolling bearing device that can be eliminated.

  In order to solve the above-described problems, a rolling bearing device according to the present invention includes a rolling bearing, a lubricating oil tank, a pump that discharges lubricating oil in the lubricating oil tank, a drive unit, a power supply unit, and a controller that includes at least a control unit. It consists of a combination of devices, and the oil supply device is attached to a spacer adjacent to the rolling bearing.

  As the lubricating oil tank, a plastic bag having flexibility is adopted. This bag can be formed by stacking resin sheets and thermally welding the outer periphery. The bag body is provided with a suction tube connected to the pump. When the bag body is formed by thermal welding, the suction tube is sandwiched between the stacked resin sheets forming the bag body and thermally welded. By doing so, it can be integrated with the bag.

  Moreover, the bag body which comprises the said lubricating oil tank can also be formed by blow molding, and when forming a bag body by blow molding, a suction tube can be blow-molded simultaneously with a bag body.

  In the fueling device, the constituent members can be accommodated in the housing to form a unit, and the housing can be attached to the spacer.

  The housing is constituted by a housing main body whose one end face is open and a detachable lid that closes the opening of the housing main body, and the lubricating oil tank can be detachably stored in the housing main body. .

  A through hole is provided through each of the spacer for attaching the oil supply unit and the housing of the oil supply unit, and a lubricating oil injection needle is inserted into the lubricating oil tank in the housing from the through hole, and the lubricating oil is supplied from the outside of the spacer. You may enable it to replenish lubricating oil in a tank. The bag portion of the lubricating oil tank into which the lubricating oil injection needle is inserted is provided with a lubricating oil injection portion made of elastic rubber so that the lubricating oil does not leak out by inserting and removing the needle tip of the lubricating oil injection needle. It is preferable.

(1) By attaching the oiling device to the spacer adjacent to the rolling bearing, the standard bearing ring and rotating bearing ring of the rolling bearing can be used without using special width and shape. Things can be used. Therefore, the management relating to the production of the rolling bearing is simplified, and the high cost can be prevented.
(2) By making the lubricating oil tank into a flexible plastic bag body and storing it in the housing constituting the lubricating unit, the lubricating unit housing itself becomes a lubricating oil tank, Since the partition wall with the electrical components inside the housing is not required, the structure of the entire oil supply unit is simplified.
(3) When replenishing the lubricating oil tank or replacing the lubricating oil tank, it is only necessary to remove the spacer with the rolling bearing attached, so that workability is good. .
(4) By configuring the housing of the oil supply unit with a housing body whose one end face is open and a detachable lid that closes the opening of the housing body, there is no need to remove the oil supply unit from the spacer, By simply removing the cover of the housing main body, the lubricating oil tank can be replenished with a lubricating oil or the lubricating oil tank can be replaced, and the workability is further improved.
(5) Since the spare oil tank can be prepared by detachably storing the oil tank of the oil supply unit with respect to the housing of the oil supply unit, when there is no lubricant in the oil tank, The old lubricant tank can be removed and replaced with a new lubricant tank. Further, by filling the spare lubricating oil tank with the lubricating oil by the lubricating oil manufacturer, the filling management of the lubricating oil is facilitated, and the risk of foreign matter entering the lubricating oil tank can be reduced.
(6) A through hole is provided that penetrates the outside of the spacer and the inside of the housing of the oil supply unit, and the needle for injecting the lubricating oil can be inserted into the lubricating oil tank in the housing from the through hole. Since the lubricating oil tank can be filled with the lubricating oil tank, it is not necessary to remove the lubricating oil tank.
(7) If the housing main body and the lid of the oil supply unit are fixed with the inner diameter surface of the spacer interposed therebetween, an adhesive for fixing the oil supply unit to the inner diameter surface of the spacer becomes unnecessary.

It is sectional drawing seen from the direction of the AA line of FIG. It is the fragmentary sectional view seen from the direction of the BB line of FIG. It is sectional drawing of the X1-X1 line | wire of FIG. 1 of an oil supply unit. It is sectional drawing which shows another embodiment of the housing of an oil supply unit. FIG. 4 is an enlarged view of a bag body surrounded by a circle indicated by a two-dot chain line in FIG. 3. FIG. 4 is an enlarged view with a part cut away showing another example of a bag body surrounded by a double-dot chain line in FIG. 3. It is sectional drawing which shows embodiment which can replenish lubricating oil from the exterior to the lubricating oil tank of an oil supply unit. It is an expanded sectional view showing an example of a power supply part of an oil supply unit. It is an expanded sectional view showing an example of a power supply part of an oil supply unit. It is an expanded sectional view showing an example of a power supply part of an oil supply unit. It is an expanded sectional view showing an example of a power supply part of an oil supply unit. It is a detailed block diagram of a drive part.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
A rolling bearing device 10 according to the embodiment shown in FIGS. 1 to 3 includes a rolling bearing 11, a spacer 12 abutted against one end in the axial direction thereof, and an oil supply unit 13 incorporated in the spacer 12. It is incorporated between the shaft 14 and the housing 15 for use. Another spacer 16 is also abutted against the other end of the rolling bearing 11, and the positioning of the rolling bearing 11 in the axial direction is performed by both the spacers 12 and 16. The rotating shaft 14 of this embodiment is installed horizontally.

  The rolling bearing 11 includes an inner ring 17 that is a rotating raceway ring, a fixed outer ring 18, a required number of rolling elements 19 interposed between these raceways, and a cage that holds the rolling elements 19 at a constant interval. Any of an angular ball bearing or a deep groove ball bearing constituted by 21 may be used. The rolling bearing 11 is preliminarily filled with desired grease, and a seal plate 22 is attached to the end on the spacer 16 side.

  The spacer 12 includes an inner ring side spacer 12a and an outer ring side spacer 12b. The inner ring side spacer 12a is fitted and fixed to the rotating shaft 14 side and abuts against one end face of the inner ring 17. The outer ring side spacer 12 b is fitted and fixed to the inner diameter surface of the housing 15 and abuts against one end surface of the outer ring 18. Similarly, the other spacer 16 is fitted and fixed to the rotating shaft 14 side and the housing 15 side, and is abutted against the other end faces of the inner ring 17 and the outer ring 18.

  As shown in FIG. 3, the oil supply unit 13 includes a power generation unit 41, a charging unit 42, a control unit 43, a drive unit 44, a pump 45, a lubricating oil tank 46, etc. in a circumferential direction in an annular housing 24. Consists of various members.

  As shown in FIG. 2, the annular housing 24 of the oil supply unit 13 has a U-shaped housing main body 24a whose surface opposite to the rolling bearing 11 is open, and the opening of the housing main body 24a is closed. The lid body 24b is detachable from the housing body 24a. The housing body 24a and the lid body 24b are made of the same kind of thermoplastic resin material such as PPS.

  The lid body 24b of the housing 24 is fixed to the housing main body 24a by screws 24c, and is removed from the oil supply unit 13 by removing the screw 24c and removing the lid body 24b, and is accommodated in the housing main body 24a. The lubricating oil tank 45 can be supplemented with lubricating oil.

  The outer peripheral surface of the housing main body 24a is bonded and fixed to the inner diameter surface of the outer ring side spacer 12b with an adhesive. An epoxy resin or the like can be used as an adhesive for bonding and fixing the housing body 24a.

  The embodiment of FIG. 4 shows an example in which the housing 24 is fixed to the inner diameter surface of the outer ring side spacer 12b without using an adhesive.

  In the example of FIG. 4, a pair of recesses 12c and 12d recessed in the outer diameter direction are formed on both axial sides of the inner diameter surface of the outer ring spacer 12b, and the outer diameter surface of the housing body 24a on the side of the rolling bearing 11 is formed. A convex portion 24d that fits into the recess 12c is formed, the convex portion 24d is fitted into the recess 12c, and the outer diameter portion of the lid 24b that is fixed to the housing main body 24a by the screw 24c. And the lid 24b is fastened and fixed to the housing main body 24a with screws 24c, so that the outer ring side spacer 12b is sandwiched between the outer rim portion of the outer ring side spacer 12b by the convex portion 24d of the housing main body 24a and the outer diameter portion of the lid 24b The housing 24 is fixed to the inner diameter surface of the seat 12b without using an adhesive.

  Next, the lubricating oil tank 46 housed in the housing main body 24 a is made of a resin-made bag body 46 a having flexibility, and is arranged in an arc shape along the annular housing 24.

  As the resin bag body 46a, for example, as shown in an enlarged view in FIG. 5, a resin bag formed by overlapping resin sheets and thermally welding the outer peripheral portion can be adopted. The code | symbol 46b of FIG. 5 has shown the heat welding part.

  The bag body 46a is provided with a suction tube 45a connected to the pump 45. The suction tube 45a is formed between the overlapped resin sheets forming the bag body 46a when the bag body 46a is formed by heat welding. It can be integrated with the bag body 46a by being sandwiched and thermally welded.

  Moreover, the bag 46a shown in FIG. 6 is formed by blow molding. When the bag body 46a is formed by blow molding, the suction tube 45a can be blow molded integrally with the bag body 46a.

  When the bag body 46a of the lubricating oil tank 46 is blow-molded, the bag-shaped portion is swelled. Therefore, it is desirable to form the bag-shaped portion flat after molding. By forming the bag-like portion flat, the lubricating oil can be discharged to the end even when the amount of the lubricating oil is reduced, and the lubricating oil in the bag 46a can be used up to the end.

  Polyamide (for example, polyamide 11, polyamide 12), fluororubber (FKM), polyamide elastomer, polyethylene, polyester, polypropylene, or the like can be used as the material of the bag 46a forming the lubricating oil tank 46. The material is not particularly limited as long as it is a material that is not affected by the lubricating oil contained in 46a.

  The suction tube 45 a provided in the bag body 46 a of the lubricating oil tank 46 is desirably removable from the pump 45. If the suction tube 45a is detachable from the pump 45, the suction tube 45a is removed from the pump 45 when the remaining amount of the lubricating oil in the lubricating oil tank 45 runs out, and the suction tube 45a is removed from the bag body 46a. Lubricating oil can be replenished.

  Further, by making the bag body 46a detachable from the pump 45, a spare bag body 46a filled with lubricating oil can be prepared, and when the lubricating oil in the bag body 46a is used up, it is used. By removing the bag 46a and replacing the spare bag 46a, the lubricating oil can be replenished in a short time. Since the spare bag 46a can be filled with lubricating oil in a state managed by the lubricant manufacturer, it is possible to reduce the risk of filling such as entry of foreign matter into the bag 46a. In addition, it is desirable to attach a lid to the suction tube 45a of the spare bag body 46a to prevent foreign matter from being mixed during storage.

  If the viscosity of the lubricating oil filled in the bag 46a of the lubricating oil tank 46 is too high, the load on the pump and the power supply will increase, so about VG22 is desirable.

  Next, in the embodiment shown in FIG. 7, it is not necessary to take out the bag body 46 a from the housing 24 or remove it from the lid body 24 b when filling the bag 46 a of the lubricating oil tank 46 with the lubricating oil. In the state where the bag body 46a is housed in the housing 24, lubricating oil can be replenished into the bag body 46a from the outside.

  As shown in FIG. 7, a through hole 25 penetrating to the inside of the housing 24 of the oil supply unit 12 is provided in the radial direction from the outer peripheral surface of the housing 15 where the rolling bearing device 10 is installed. The lubricating oil injection needle 26 is inserted into the bag body 46a in the housing 24 to replenish the lubricating oil into the bag body 46a. In the portion of the bag body 46a into which the lubricating oil injection needle 26 pierces, the lubricating oil injection portion 28 made of highly elastic rubber is used so that the lubricating oil does not leak out by inserting and removing the needle tip 27 of the lubricating oil injection needle 26. Is provided.

  The radial direction through hole 25 provided in the housing 15 where the rolling bearing device 10 is installed, the spacer 12 and the housing 24 of the oil supply unit 13 and the lubricating oil injection portion 28 of the bag body 46a are circumferentially inserted into each other. So that the position matches.

  In each of the above embodiments, in addition to the lubricating oil tank 46, the power generation unit 41, the charging unit 42, the control unit 43, the drive unit 44, the pump 45, and the like are housed in the annular housing 24 in the circumferential direction. .

  As the power generation unit 41, for example, a unit that generates power by the Seebeck effect as shown in FIG. 8 can be used. That is, when the rolling bearing device 10 is used, the temperature of the inner ring 17 and the outer ring 18 rises due to frictional heat with the rolling elements 19 (see FIG. 1). Usually, since the outer ring 18 is incorporated in the housing 15 of the device, it is dissipated by heat conduction, and a temperature difference occurs between the inner and outer rings 17 and 18. The temperature is conducted to each of the thermal conductors 52 and 53, and a temperature difference is generated between both end faces of the Seebeck element 54, thereby generating power by the Seebeck effect.

  When the heat conductors 52 and 53 penetrating the inner peripheral surface and the outer peripheral surface of the housing main body 24a are provided and the Seebeck element 54 is interposed between the heat conductors 52 and 53, the outer peripheral surface of the housing main body 24a is used. It is desirable to use an adhesive in consideration of thermal conductivity on the surface where the thermal conductor 52 penetrating the outer surface contacts the inner diameter surface of the outer ring spacer 12b. Note that the outer diameter of the heat conductor 52 on the outer ring side is the same as the inner diameter dimension of the outer ring spacer 12b, and is closely attached so that the heat dissipation effect is enhanced. On the other hand, the inner diameter of the heat conductor 53 on the inner ring side is not in contact with the inner ring spacer 12a. If possible, it is desirable to make the volumes of the heat conductors 52 and 53 on the outer ring side and the inner ring side equal.

  In addition, between the inner diameter surface of the outer ring spacer 12b and the heat conductor 52, between the heat conductor 52 and the Seebeck element 54, and between the Seebeck element 54 and the heat conductor 53 on the inner ring side, heat conductivity and adhesion are provided. In order to increase the heat dissipation, it is preferable to apply heat radiation grease or the like. Generally, the heat dissipating grease is mainly composed of silicone. Moreover, the heat conductors 52 and 53 use a metal with high heat conductivity. For example, silver, copper, gold and the like can be mentioned, but copper is generally used from the viewpoint of cost. A copper alloy mainly composed of copper may be used. Moreover, the sintered alloy which has copper as a main component may be sufficient.

  As the power generation unit 41, in addition to the power generation by the Seebeck effect, those shown in FIGS. 9, 10, and 11 can be used.

  The configuration shown in FIG. 9 is applied when an alternating magnetic field exists in the rolling bearing device 10. In a built-in spindle such as a machine tool or in the vicinity of a high-frequency device that handles high power, leakage magnetic flux or high-frequency irradiation occurs. Electricity is generated by electromagnetic induction using this leakage magnetic flux. That is, by combining the coil 56 with the E-shaped iron core 55 with one side open, an alternating magnetic field is efficiently captured and power is generated by electromagnetic induction. An insulating base 57 is attached to the open surface of the iron core 55. When the frequency of the leakage magnetic flux is known, a coil 56 that resonates with the frequency of the leakage magnetic flux except for the iron core 55 may be used.

  The one shown in FIG. 10 is applied when vibration occurs in the rolling bearing device 10. That is, a large number of electrodes 60 are provided on opposite surfaces of the fixed-side insulating substrate 58 and the movable-side insulating substrate 59 disposed thereon, and the electret 61 is stacked only on the electrodes 60 of the fixed-side insulating substrate 58, thereby moving-side insulating. A gap is provided to face the electrode 60 of the substrate 59. The movable insulating substrate 59 can be moved only in the direction of arrow a in the figure by the sliding device 62.

  When vibration is generated in the rolling bearing device 10, the movable insulating substrate 59 is vibrated in the direction of arrow a by the sliding device 62. At this time, charges due to electrostatic induction are generated between the electrodes 60 due to the relative movement of the fixed and movable insulating substrates 58 and 59 and the electret 61. Electricity is generated by taking out the generated electric charges to the outside.

  The one shown in FIG. 11 is also applied when vibration occurs in the rolling bearing device 10. In other words, an elastic sheet-like piezoelectric body 64 is disposed between the fixed-side insulating substrate 58 and the weight 63. When vibration is generated in the bearing device 10, the weight 63 is vibrated in the direction of the arrow a by the weight 63 and the piezoelectric body 64. At this time, the piezoelectric body 64 is distorted to generate an electromotive force due to dielectric polarization. Electric power is generated by extracting the electromotive force to the outside.

  The electric charge generated by the power generation unit 41 is stored in a charging unit 42 such as a storage battery or a capacitor. The capacitor is preferably an electric double layer capacitor (capacitor).

  As shown in FIG. 12, the drive unit 43 includes sensors such as a bearing temperature sensor 47a, a bearing rotation sensor 47b, a remaining amount of lubricant sensor 47c, and a lubricant temperature sensor 47d. Signals from these sensors are input to the CPU 51, and the pump 44 is automatically controlled in accordance with the temperature of the rolling bearing 11 and the rotation state thereof to adjust the supply amount of the lubricating oil.

  The pump 44 includes a suction tube 45a that sucks the lubricating oil in the lubricating oil tank 45 and a discharge tube 45b that discharges the sucked lubricating oil, and is fixed to the rolling bearing 11 from the discharge nozzle 45c at the tip of the discharge tube 45b. Lubricating oil is supplied between the bearing ring and the rotating raceway.

  For example, the drive timing of the pump 45 can be performed when electric power is stored in the capacitor of the charging unit 42 and reaches a certain voltage. When the storage time is short in relation to the power generation efficiency, the resistor may be discharged when the storage voltage reaches a certain value, and an interval may be provided at the drive timing of the pump 45. In this case, charging / discharging is repeated before the pump 45 is driven, and the driving interval of the pump 45 may be managed by the number of times of charging / discharging. Alternatively, an interval may be provided at the driving timing of the pump 45 by the timer function when the stored voltage reaches a certain value. In this case, the above charging / discharging is not repeated.

  The suction tube 45a connected to the suction side of the pump 45 is inserted into the lubricating oil tank 46, and the lubricating oil in the lubricating oil tank 46 is sucked.

  On the other hand, a discharge nozzle 45c for discharging lubricating oil is connected to the inside of the rolling bearing at the tip of the discharge tube 45b connected to the discharge side. It is desirable that the tip of the discharge nozzle 45c be disposed between the bearing inner and outer rings at a portion close to the inner ring outer peripheral surface. The inner diameter dimension of the nozzle hole of the discharge nozzle 45c is appropriately set depending on the relationship between the surface tension resulting from the viscosity of the base oil and the discharge amount.

  In addition, said embodiment is inner ring | wheel rotation. Further, although the rotation center is the horizontal axis, it may be the vertical axis. Furthermore, it may be incorporated in the spindle of the machine tool.

DESCRIPTION OF SYMBOLS 10 Bearing apparatus 11 Rolling bearing 12 Spacer 12a Inner ring side spacer 12b Outer ring side spacer 12c, 12d Recess 13 Refueling unit 14 Rotating shaft 15 Housing 16 Spacer 17 Inner ring 18 Outer ring 19 Rolling element 21 Cage 22 Seal plate 24 Housing 24a housing body 24b cover 24c screw 24d protrusion 25 through hole 26 lubricating oil injection needle 27 needle tip 28 lubricating oil injection part 41 power generation part 42 charging part 43 control part 44 driving part 45 pump 45a suction tube 45b discharge tube 45c discharge Nozzle 46 Lubricating oil tank 46a Bag body 46b Heat welded portions 47a to 47d Sensor 51 CPU
52, 53 Thermal conductor 54 Seebeck element 55 Iron core 56 Coil 57 Insulating base 58 Fixed insulating substrate 59 Movable insulating substrate 60 Electrode 61 Electret 62 Sliding device 63 Weight 64 Piezoelectric body

Claims (8)

  It consists of a combination of a rolling bearing and a lubricating oil tank having a lubricating oil discharge port, a pump, a drive unit, a power supply unit, and a control unit, and the lubricating device is attached to a spacer adjacent to the rolling bearing. A rolling bearing device in which the lubricating oil tank is formed of a flexible bag.   The rolling bearing device according to claim 1, wherein the bag forming the lubricating oil tank is formed by stacking resin sheets and thermally welding the outer peripheral portion.   The rolling bearing device according to claim 2, wherein the suction tube connecting the lubricating oil tank and the pump is sandwiched between the overlapped resin sheets forming the bag body and thermally welded.   The rolling bearing device according to any one of claims 1 to 3, wherein the bag body forming the lubricating oil tank is formed by blow molding.   The rolling bearing device according to claim 4, wherein a suction tube connecting the lubricating oil tank and the pump is formed integrally with the bag body by blow molding.   The rolling bearing device according to any one of claims 1 to 5, wherein the constituent members of the oil supply device are housed in a housing to form a unit, and the housing is attached to a spacer.   The housing includes a housing main body having an open end and a detachable lid that closes the opening of the housing main body, and the lubricating oil tank is detachably stored in the housing main body. 6. The rolling bearing device according to 6. A through hole for inserting a needle for injecting lubricating oil into the housing from the outside of the spacer is provided in the spacer to which the unitized oil supply device is attached and the housing of the oil supply device, and the lubricating oil tank in the housing facing this through hole The part is provided with a lubricating oil injection part made of elastic rubber, the needle tip of the lubricating oil injection needle is inserted into the lubricating oil tank through this lubricating oil injection part, and the lubricating oil tank is inserted by the lubricating oil injection needle The rolling bearing device according to claim 6 or 7, wherein lubricating oil is replenished therein.

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