JP5747319B2 - Bearing device and device including the same - Google Patents

Description

  The present application relates to a bearing device. More specifically, the present invention relates to a bearing device capable of transmitting electric power and / or signals without contact between a rotating side and a supporting side.

  Patent Document 1 discloses a bearing device according to the prior art. The bearing device includes an inner member to which a rotating shaft is attached and an outer member that rotatably supports the inner member. A rotation-side electromagnetic induction module is attached to the inner member, and a fixed-side electromagnetic induction module is attached to the outer member. The rotation-side electromagnetic induction module and the stationary-side electromagnetic induction module are arranged to face each other, and signals can be transmitted by electromagnetic induction of these electromagnetic induction modules.

JP 2008-249005 A

  As described above, in this type of bearing device, electric power and signals are transmitted from the rotation side to the fixed side and / or from the fixed side to the rotation side by electromagnetic induction between the rotation side electromagnetic induction module and the fixed side electromagnetic induction module. For this reason, when a current flows through the electromagnetic induction module due to electromagnetic noise, a device connected to the electromagnetic induction module may malfunction or be damaged. Moreover, when transmitting electric power or a signal, an external device malfunctions or is damaged due to electromagnetic noise caused by a magnetic field generated from the electromagnetic induction module.

  The present application has been made in view of the above-described circumstances, and an object thereof is to provide a bearing device that can suppress the influence of electromagnetic wave noise and prevent malfunction and damage of the device due to electromagnetic wave noise. .

  The bearing device disclosed in the present specification is arranged on the outer side of the first cylindrical member, the rolling element in contact with the outer peripheral surface of the first cylindrical member, and the rolling element in contact with the inner peripheral surface thereof. A second cylindrical member that supports the first cylindrical member in a relatively rotatable manner, a first electromagnetic induction module that is attached to the first cylindrical member, and a first cylindrical member and the first electromagnetic induction module, A first electrical insulator that electrically insulates the first cylindrical member and the first electromagnetic induction module; a second electromagnetic induction module that is attached to the second cylindrical member and disposed at a position facing the first electromagnetic induction module; And a second electrical insulator that is disposed between the two cylindrical members and the second electromagnetic induction module and electrically insulates the second cylindrical member and the second electromagnetic induction module.

  In this bearing device, the first electrical insulator is disposed between the first cylindrical member and the first electromagnetic induction module, and the second electrical insulator is disposed between the second cylindrical member and the second electromagnetic induction module. ing. For this reason, even if an electric current etc. generate | occur | produce in a 1st cylindrical member or a 2nd cylindrical member by electromagnetic wave noise, it is suppressed that an electric current flows into a 1st electromagnetic induction module or a 2nd electromagnetic induction module. As a result, unintended power transmission and erroneous signal transmission can be suppressed, and malfunction and destruction of equipment connected to the electromagnetic induction module can be prevented. In addition, when power and signals are transmitted between the electromagnetic induction modules, it is possible to suppress the occurrence of an electric current or the like in the first cylindrical member or the second cylindrical member due to electromagnetic noise caused by a magnetic field generated from the electromagnetic induction modules. it can. As a result, it is possible to prevent malfunction or destruction of equipment connected to the first cylindrical member or the second cylindrical member. For example, when the first cylindrical member or the second cylindrical member is grounded, it is possible to prevent malfunction or destruction of equipment connected to the grounding wire.

  In the above bearing device, a first attachment portion to which the first member is attached is formed on the inner peripheral surface of the first cylindrical member, and a second attachment portion to which the second member is attached is formed on the outer peripheral surface of the second cylindrical member. The first member and the second member may be relatively rotatable via a bearing device. In this case, a first electromagnetic induction module mounting portion to which the first electromagnetic induction module is mounted is formed on the outer peripheral surface of the first cylindrical member, and the inner peripheral surface of the second cylindrical member is in contact with the rolling element. And the 2nd support part which supports a 1st cylindrical member so that relative rotation is possible, and the 2nd electromagnetic induction module attachment part to which a 2nd electromagnetic induction module is attached may be formed. The first attachment portion and the first electromagnetic induction module attachment portion are arranged side by side in the axial direction of the first cylindrical member, and the second support portion and the second electromagnetic induction module attachment portion are in the axial direction of the second cylindrical member. May be arranged side by side. And in the position where the 1st attachment part was formed, the 1st support part in which a rolling element contacts the outer peripheral surface of the 1st cylindrical member is formed, and in the position where the 1st electromagnetic induction module attachment part was formed, It is preferable that the inner peripheral surface of the first cylindrical member is shifted outward from the first attachment portion. According to such a configuration, at the position where the first electromagnetic induction module is attached, a gap is formed between the first cylindrical member and the first member, and the position where the first member is attached (that is, the first attachment portion). Thus, the first cylindrical member and the rolling element come into contact with each other. For this reason, the one-sided contact between the cylindrical member and the rolling element is prevented, and uneven contact between the cylindrical member and the rolling element is avoided. Moreover, the distance from the contact point of a rolling element and a cylindrical member to the action point of the external force which acts on a cylindrical member from a 1st member or a 2nd member becomes short. For this reason, the moment which acts on a cylindrical member can be made small, and a deformation | transformation etc. of these cylindrical members can be prevented. As a result, it is possible to prevent problems such as contact between the cylindrical members due to deformation of the cylindrical members, overload, performance degradation, and damage. The outer peripheral surface of the second cylindrical member at the position where the second electromagnetic induction module mounting portion is formed may be shifted inward from the outer peripheral surface of the second cylindrical member at the position where the second support portion is formed. . Moreover, a radiation fin can be provided on at least a part of the inner peripheral surface of the first cylindrical member and the harmful peripheral surface of the second cylindrical member. By providing the heat dissipating fins, the heat dissipating property of the bearing portion can be improved and the occurrence of problems such as solidification of the lubricant can be effectively suppressed.

  In the bearing device, the first electromagnetic shield disposed between the first cylindrical member and the first electrical insulator, and the first electromagnetic shield disposed between the second cylindrical member and the second electrical insulator. 2 electromagnetic shields, the first electrical insulator is disposed between the first electromagnetic induction module and the first electromagnetic shield, and the second electrical insulator is the second electromagnetic induction module and the second electromagnetic shield. You may arrange | position between shields. Further, each of the first cylindrical member and the second cylindrical member may be formed of an electromagnetic shielding material. In this case, an accommodation space surrounded by the first cylindrical member and the second cylindrical member may be formed between the first cylindrical member and the second cylindrical member. The first electromagnetic induction module, the first electromagnetic shield, the first electrical insulator, the second electromagnetic induction module, the second electromagnetic shield, and the second electrical insulator are preferably accommodated in the accommodation space. . According to such a configuration, the electromagnetic shielding by the first cylindrical member and the second cylindrical member and the electromagnetic shielding by the first electromagnetic shielding body and the second electromagnetic shielding body are performed. It can suppress that it arises more.

  In the case of adopting the above configuration, a gap is formed between the first cylindrical member and the second cylindrical member so as to communicate the housing space with the outside of the bearing device. The first electromagnetic shield covers all surfaces of the first electromagnetic induction module except for the surface facing the second electromagnetic induction module, and the second electromagnetic shield is the first electromagnetic induction of the second electromagnetic induction module. All the surfaces except the surface facing the module may be covered. And at least one part of said clearance gap is orthogonal to the surface facing the 2nd electromagnetic induction module of a 1st electromagnetic induction module, and orthogonal to the surface facing the 1st electromagnetic induction module of a 2nd electromagnetic induction module. It is preferable. According to such a configuration, the electromagnetic wave noise that has entered from the gap does not easily enter the facing surface of the electromagnetic induction module due to the straightness of the electromagnetic noise. Thereby, it is possible to further suppress an adverse effect caused by electromagnetic wave noise.

  In the above bearing device, the first member is attached to the first cylindrical member, the second member is attached to the second cylindrical member, and the first member and the second member are The relative rotation may be possible via the bearing device. A sensor and an electronic circuit may be attached to one cylindrical member. The sensor and the electronic circuit are operated by the electric power transmitted from the electromagnetic induction module on the other cylindrical member side to the electromagnetic induction module on the one cylindrical member side. The electronic circuit includes a signal from the sensor and the other cylindrical member side. A signal transmitted from the electromagnetic induction module to the electromagnetic induction module on one cylindrical member side is input, and a signal output from the electronic circuit and a signal output from the sensor are transmitted from the electromagnetic induction module on one cylindrical member side to the other. It is preferably transmitted to the electromagnetic induction module on the cylindrical member side. According to such a configuration, abnormality or the like of the first member or the cylindrical member to which the first member is attached can be detected by the sensor, and the abnormality can be transmitted to the cylindrical member to which the second member is attached. The sensor may detect not only the abnormality of the first member and the cylindrical member but also the normal state of the first member and the like, and the detection of heat and vibration. By performing such detection, it is possible to quickly detect a change in the bearing device, prevent troubles from occurring, and can also be used to determine the maintenance time.

  In the bearing device, the first electromagnetic induction module includes a first power coil for transmitting power, a first signal coil for transmitting a signal, a first power coil, and a first signal. It can have one 1st core by which the coil is turned. The second electromagnetic induction module is opposed to the first power coil and is opposed to the second power coil for transmitting power and the first signal coil and is for the second signal for transmitting the signal. The coil, the second power coil, and the second signal coil may have one second core that is wound around. According to such a configuration, since the two coils for power transmission and signal transmission are arranged on the rotating side and the stationary side, respectively, complicated processing is required compared to the case where power and signals are transmitted by a pair of coils. This eliminates the need for power transmission and signal transmission. Further, since both the power coil and the signal coil are wound on one core, the electromagnetic induction module can be arranged in a small space.

  In the above bearing device, the first member is attached to the first cylindrical member, and the second member is attached to the second cylindrical member. The member may be capable of relative rotation via a bearing device. In this case, the first electromagnetic induction module includes a first power coil for transmitting power, a first signal coil for transmitting a signal, and a first power in which the first power coil is wound. And a first signal core in which the first signal coil is wound, and the first power core and the first signal core are arranged side by side in the radial direction of the first cylindrical member. May be. The second electromagnetic induction module is opposed to the first power coil and is opposed to the second power coil for transmitting power and the first signal coil and is for the second signal for transmitting the signal. A second power core on which a coil, a second power coil is wound, and a second signal core on which a second signal coil is wound. The second power core and the second signal The cores may be arranged side by side in the radial direction of the second cylindrical member. In this case, the facing surface of the first power core facing the second power core and the facing surface of the first signal core facing the second signal core are shifted in the axial direction of the first cylindrical member. In addition, the facing surface of the second power core facing the first power core and the facing surface of the second signal core facing the first signal core are shifted in the axial direction of the second cylindrical member. Is preferred. According to such a configuration, it is possible to prevent the magnetic flux induction generated by the electromagnetic induction by the power electromagnetic induction module and the electromagnetic induction by the signal electromagnetic induction module from affecting each other.

  In a bearing device having two coils, a power coil and a signal coil, a first power wiring connected to the first power coil, and a first signal wiring connected to the first signal coil And a second power wiring connected to the second power coil and a second signal wiring connected to the second signal coil. The first cylindrical member has an end surface extending in a direction to close the space between the first cylindrical member and the second cylindrical member, and the first power wiring and the first signal wiring are the first cylinder. It is preferable that it is pulled out from the end surface of the member. According to such a configuration, it is possible to eliminate the need for machining for routing the wiring around the inner peripheral surface of the first cylindrical member. As a result, a decrease in strength of the first cylindrical member can be prevented, and the number of processing steps can be reduced.

  In addition, said bearing apparatus can be used for a wind power generator. That is, the wind turbine generator disclosed in this specification includes a first member that rotates by receiving wind, a second member that is rotatably attached to the rotating member, and a rotatably attached to the second member. Any one of the above-described bearing devices is used for at least one of the connecting portion of the first member and the second member and the connecting portion of the second member and the third member. Yes. In this wind turbine generator, power and / or signal transmission between the first member and the rotating member can be performed without contact and stably.

  Moreover, said bearing apparatus can be used for a universal joint apparatus. That is, the universal joint device disclosed in the present specification is disposed between the first rotating shaft, the second rotating shaft to which the rotation of the first rotating shaft is transmitted, and the first rotating shaft and the second rotating shaft. And having a cross spider. At least one end of the first shaft portion of the cross spider is rotatably attached to the first rotating shaft via the first bearing device which is one of the bearing devices described above, and the first cylindrical member of the first bearing device And one of the second cylindrical members is attached to one end of the first shaft portion, and the other of the first cylindrical member and the second cylindrical member of the first bearing device is attached to the first rotating shaft. In this universal joint device, power and / or signal transmission between the first rotating shaft and the cross spider can be performed without contact and stably. Moreover, when a sensor is attached to the cross spider, the signal from the sensor can be monitored on the first shaft side, and abnormality diagnosis or the like of the universal joint can be performed.

  Further, in the universal joint device, at least one end of the second shaft portion of the cross spider is rotatably attached to the second rotating shaft via the second bearing device which is one of the above-described bearing devices, One of the first cylindrical member and the second cylindrical member of the second bearing device is attached to one end of the second shaft portion, and the other of the first cylindrical member and the second cylindrical member of the second bearing device is the second rotating shaft. The electromagnetic induction module on the side attached to the first shaft portion of the first bearing device and the electromagnetic induction module on the side attached to the second shaft portion of the second bearing device are connected by wiring. It may be electrically connected. According to such a configuration, power and / or signal transmission between the first rotating shaft and the second rotating shaft can be stably performed without contact.

  The bearing device can be used for an axle device. That is, the axle device disclosed in the present specification includes any one of a support member, a rotating shaft, a wheel attached to the rotating shaft, and the bearing device described above, and the first cylinder of the bearing device. One of the member and the second cylindrical member is attached to the support member and the other is attached to the rotation shaft, and the rotation shaft is rotatably supported by the support member via the bearing device. According to this axle device, electric power and / or signal transmission between the support member and the rotating member can be performed without contact and stably. Further, when the sensor is attached to the wheel, it is possible to determine in advance the abnormality of the wheel, to prevent the malfunction and damage of the wheel, and to prolong the life by early problem solving.

Sectional drawing of the bearing apparatus which concerns on Example 1 is shown. Sectional drawing of the bearing apparatus which concerns on Example 2 is shown. Sectional drawing of the bearing apparatus which concerns on Example 3 is shown. Sectional drawing of the bearing apparatus which concerns on Example 4 is shown. Sectional drawing of the bearing apparatus which concerns on Example 5 is shown. Sectional drawing of the bearing apparatus which concerns on Example 6 is shown. Sectional drawing of the bearing apparatus which concerns on Example 7 is shown. Sectional drawing of the bearing apparatus which concerns on Example 8 is shown. Sectional drawing of the bearing apparatus which concerns on Example 9 is shown. Sectional drawing of the bearing apparatus which concerns on Example 10 is shown. It is a figure which shows typically the universal joint apparatus provided with either of the bearing apparatuses which concern on Examples 1-10. It is a figure which shows typically the wind power generator provided with either of the bearing apparatuses which concern on Examples 1-10. It is a figure which shows the example which used either the bearing apparatus which concerns on Examples 1-10 for the bearing apparatus which supports a wheel.

  As illustrated in FIG. 1, the bearing device 10 according to the first embodiment includes a first cylindrical member 13 and a second cylindrical member 23 that is disposed outside the first cylindrical member 13. A rotation shaft (not shown) is attached to the first cylindrical member 13, and a support body (not shown) is attached to the second cylindrical member 23. Thereby, a rotating shaft is supported rotatably with respect to a support body.

  The first cylindrical member 13 has a cylindrical cylindrical portion 12 and a seal member 14 fixed to one end of the cylindrical portion 12. The cylindrical portion 12 is formed of an electromagnetic shielding material (for example, steel material or stainless steel). A rotating shaft (not shown) is fixed to the inner peripheral surface 12c of the cylindrical portion 12 by press fitting or the like. On the outer peripheral surface of the cylindrical portion 12, a first support portion 12a with which the rolling elements 32 abut and a first attachment portion 12b to which the first electromagnetic induction module (18, 20a) is attached are formed. The 1st support part 12a and the 1st attaching part 12b are arranged along with the direction (henceforth an axial direction) where axis C of a rotating shaft extends. The 1st support part 12a protrudes in the radial direction outer side (henceforth only radial direction outer side) of a rotating shaft rather than the 1st attachment part 12b. For this reason, the level | step difference is formed in the both sides (namely, the 1st attaching part 12b side and the other side) of the axial direction of the 1st support part 12a.

  The seal member 14 is a ring-shaped plate material and is formed of an electromagnetic shielding material (for example, stainless steel). The seal member 14 is fixed to one end of the cylindrical portion 12 (that is, the end portion on the first attachment portion 12b side). The seal member 14 protrudes radially outward from the outer peripheral surface of the cylindrical portion 12. The seal member 14 extends to a position close to the second cylindrical member 22, and a gap 36 b is formed between the seal member 14 and the second cylindrical member 22. The gap 36b extends in the axial direction from the outer peripheral surface of the seal member 14, and then bends in the radial direction.

  A first electromagnetic induction module (18, 20 a) is attached to the first cylindrical member 13 (specifically, the seal member 14 and the cylindrical portion 12) via a first electrical insulator 16. The first electrical insulator 16 is made of an insulating material (for example, epoxy resin, Teflon (registered trademark), etc.). An inner peripheral surface of the first electric insulator 16 is fixed to the first mounting portion 12 b of the cylindrical portion 12, and one end surface of the first electric insulator 16 is fixed to the seal member 14. Thereby, the separation of the first electrical insulator 16 between the cylindrical portion 12 and the first electromagnetic induction module (18, 20a) and between the seal member 14 and the first electromagnetic induction module (18, 20a). Only distance is provided. A space is formed between the outer peripheral surface of the electrical insulator 16 and the second cylindrical member 22.

  The first electromagnetic induction module (18, 20 a) is disposed along the outer periphery of the first cylindrical member 13. The first electromagnetic induction module (18, 20a) has a ring-shaped pot core 18 and a coil 20a wound around the pot core 18. The pot core 18 is made of a magnetically permeable material (for example, ferrite). The pot core 18 is covered with the first electrical insulator 16 except for the surface facing the second electromagnetic induction module (28, 30a). The coil 20 a is disposed inside the pot core 18. The coil 20a is covered with the pot core 18 except for the surface facing the second electromagnetic induction module (28, 30a). The surfaces of the pot core 18 and the first electrical insulator 16 facing the second electromagnetic induction module (28, 30a) are located on the same plane and are orthogonal to the axis C of the rotation axis. One end of a lead wire 20b is connected to the coil 20a. The lead wiring 20b passes through the seal member 14 and is drawn to the outside.

  The second cylindrical member 23 includes a cylindrical cylindrical portion 22 and seal members 24 a and 24 b fixed to the cylindrical portion 22. The cylindrical portion 22 is formed of an electromagnetic shielding material (for example, steel material or stainless steel). The inner peripheral surface of the cylindrical portion 22 faces the outer peripheral surfaces 12 a and 12 b of the first cylindrical member 13. On the inner peripheral surface of the cylindrical portion 22, a second support portion 22a with which the rolling element 32 abuts and a second attachment portion 22b to which the second electromagnetic induction module (28, 30a) is attached are formed. The second support part 22a and the second attachment part 22b are arranged side by side in the axial direction. The second support portion 22 a and the second mounting portion 22 b are located on the same plane, and no step is formed on the inner peripheral surface of the cylindrical portion 22. Further, no step is formed on the outer peripheral surface 22 c of the cylindrical portion 22. A support body (not shown) is fixed to the outer peripheral surface 22 c of the cylindrical portion 22.

  The seal member 24a is a ring-shaped plate material and is formed of an electromagnetic shielding material (for example, stainless steel). The seal member 24a is fixed to one end of the cylindrical portion 22 (that is, the end portion on the second support portion 22a side). The seal member 24a protrudes radially inward from the inner peripheral surface of the cylindrical portion 22. The seal member 24 a extends to a position close to the first cylindrical member 13, and a gap 36 a is formed between the seal member 24 a and the first cylindrical member 13. The gap 36a extends in the axial direction from the outer peripheral surface of the seal member 24a and then bends in the radial direction.

  The seal member 24b is a ring-shaped plate material and is formed of an electromagnetic shielding material (for example, stainless steel). The seal member 24b is fixed to the cylindrical portion 22 at a position between the second electromagnetic induction module (28, 30a) and the rolling element 32. The seal member 24b protrudes from the inner peripheral surface of the cylindrical portion 22 toward the radially inner side of the rotation shaft (hereinafter simply referred to as the radially inner side). The seal member 24 b extends to a position close to the first cylindrical member 13, and a gap 36 c is formed between the seal member 24 b and the first cylindrical member 13. The gap 36c extends in the axial direction from the space 35 side toward the space 34 side, and then bends in the radial direction.

  A second electromagnetic induction module (28, 30a) is attached to the second cylindrical member 23 (specifically, the seal member 24b and the cylindrical portion 22) via a second electrical insulator 26. The second electrical insulator 26 is made of an insulating material (for example, epoxy resin, Teflon (registered trademark), etc.). The outer peripheral surface of the second electrical insulator 26 is fixed to the second mounting portion 22b of the cylindrical portion 22, and one end surface of the second electrical insulator 16 is fixed to the seal member 24b. Thereby, the separation of the second electrical insulator 26 between the cylindrical portion 22 and the second electromagnetic induction module (28, 30a) and between the seal member 24b and the second electromagnetic induction module (28, 30a). Only distance is provided. A space is formed between the inner peripheral surface of the electrical insulator 26 and the first cylindrical member 13.

  The second electromagnetic induction module (28, 30a) is disposed along the inner peripheral surface of the second cylindrical member 23, and is disposed to face the first electromagnetic induction module (18, 20a). A slight gap is formed between the second electromagnetic induction module (28, 30a) and the first electromagnetic induction module (18, 20a). The second electromagnetic induction module (28, 30a) includes a pot core 28 and a coil 30a wound around the pot core 28. The pot core 28 is made of a magnetically permeable material (for example, ferrite). The pot core 28 is covered with the second electrical insulator 26 except for the surface facing the first electromagnetic induction module (18, 20a). The coil 30 a is disposed inside the pot core 28. The coil 30a is covered with the pot core 18 except for the surface facing the first electromagnetic induction module (18, 20a). The surfaces of the pot core 28 and the second electrical insulator 26 facing the first electromagnetic induction module (18, 20a) are located on the same plane and are orthogonal to the axis C of the rotation axis. One end of a lead wire 30b is connected to the coil 30a. The lead wiring 30b passes through the second cylindrical member 23 and is drawn to the outside.

  In the bearing device 10 described above, the seal members 14 and 24a are arranged between the cylindrical portion 12 of the first cylindrical member 13 and the cylindrical portion 22 of the second cylindrical member 23, so that the periphery thereof is the same as that of the first cylindrical member 13 and the second cylindrical member 23. A housing space (34, 35) surrounded by the two cylindrical members 23 is formed. The accommodation spaces (34, 35) are divided into two spaces by the seal member 24b. The rolling element 32 is disposed in one space 34, and the electrical insulators 16 and 26 and the electromagnetic induction modules (18, 20 a) and (28, 30 a) are disposed in the other space 35. By closing the space between the first cylindrical member 13 and the second cylindrical member 23 with the sealing members 14, 24a, 24b, the lubricant (for example, grease) filled in the space 34 can be sealed. Moreover, it can prevent that a foreign material approachs into the spaces 34 and 35, and can protect the 1st electromagnetic induction module (18, 20a) and the 2nd electromagnetic induction module (28, 30a).

  In the bearing device 10 described above, in order to transmit power or signals between the first cylindrical member 13 side and the second cylindrical member 23 side, a first power or signal transmission circuit is connected to one end of the lead-out wiring 20b. Then, the second power or signal transmission circuit is connected to one end of the lead wiring 30b. When transmitting power or a signal from the first cylindrical member 13 side to the second cylindrical member 23 side, the first power or signal transmission circuit can electromagnetically induce the power or signal to be transmitted to the second cylindrical member 23 side. The state is set and supplied to the coil 20a of the first electromagnetic induction module (18, 20a). Thereby, a current flows through the coil 20a of the first electromagnetic induction module (18, 20a), and a current flows through the coil 30a of the second electromagnetic induction module (28, 30a) due to the electromagnetic induction. The second power or signal transmission circuit converts a current (signal) flowing through the coil 30a of the second electromagnetic induction module (28, 30a) into power or a signal. On the contrary, when power or a signal is transmitted from the second cylindrical member 23 side to the first cylindrical member 13 side, the procedure may be reversed. In addition, electric power and a signal can also be simultaneously transmitted between the 1st cylindrical member 13 side and the 2nd cylindrical member 23 side. In this case, a circuit for combining power and signal may be provided on the transmission side, and a circuit for separating power and signal from the received signal may be provided on the reception side.

  As is clear from the above description, in the bearing device 10 described above, the first cylindrical member 13 and the second cylindrical member 23 are provided with a portion where the rolling element 32 abuts and an electromagnetic induction module (18, 20a) or (28. 30a) are arranged side by side in the axial direction of the rotary shaft, and the lengths of the first cylindrical member 13 and the second cylindrical member 23 in the axial direction are increased. For this reason, the surface area of the 1st cylindrical member 13 and the 2nd cylindrical member 23 increases, and the heat dissipation is improved. As a result, frictional heat generated between the rolling element 32 and the first cylindrical member 13 and frictional heat generated between the rolling element 32 and the second cylindrical member 23 can be efficiently radiated to the outside. Thereby, solidification of the lubricant sealed between the first cylindrical member 13 and the second cylindrical member 23, thermal deformation of the first cylindrical member 13 and the second cylindrical member 23, and the like can be suppressed.

  In the bearing device 10 described above, the first electromagnetic induction module (18, 20a) is attached to the first cylindrical member 13, and the second electromagnetic induction module (28, 30a) is attached to the second cylindrical member 23. . Here, the processing accuracy of the first cylindrical member 13 and the second cylindrical member 23 is high, and the rotational accuracy of the members 13 and 23 in the radial direction and the thrust direction is also high. For this reason, the positional relationship between the first electromagnetic induction module (18, 20a) and the second electromagnetic induction module (28, 30a) can also be managed with high accuracy. As a result, stable electromagnetic induction can be performed between the first electromagnetic induction module (18, 20a) and the second electromagnetic induction module (28, 30a), and stable power or signal transmission can be performed. For example, as the gap between the first electromagnetic induction module (18, 20a) and the second electromagnetic induction module (28, 30a) increases, the resistance component increases, the amount of power that can be transmitted decreases, and the transmitted signal waveform is accurate. May not be able to communicate to However, in the bearing device 10 described above, since the gap between the first electromagnetic induction module (18, 20a) and the second electromagnetic induction module (28, 30a) is constant, stable power or signal transmission can be performed. .

  In the bearing device 10 described above, the first electromagnetic induction module (18, 20a) and the second electromagnetic induction module (28, 30a) are in a space surrounded by the first cylindrical member 13 and the second cylindrical member 23. Is arranged. Since these members 12, 14, 22, and 24a are formed of an electromagnetic shielding material, it is suppressed that electromagnetic noise generated outside affects the electromagnetic induction modules (18, 20a), (28, 30a), Further, electromagnetic noise generated in the electromagnetic induction modules (18, 20a) and (28, 30a) is prevented from acting on the external device. As a result, it is possible to prevent malfunction or damage of equipment connected to the bearing device 10 or external equipment.

  Further, in the bearing device 10, the first electromagnetic induction module (18, 20 a) is attached to the first cylindrical member 13 via the first electric insulator 16, and the second electric insulator 26 is attached to the second cylindrical member 23. The second electromagnetic induction module (28, 30a) is attached via For this reason, the distance between the first electromagnetic induction module (18, 20a) and the second electromagnetic induction module (28, 30a) and the first cylindrical member 13 and the second cylindrical member 23 can be maintained at an appropriate length. For this reason, leakage of magnetic flux from the first electromagnetic induction module (18, 20a) and the second electromagnetic induction module (28, 30a) is reduced, and the energy efficiency of both can be improved. This enables stable signal or power transmission. Furthermore, since leakage of magnetic flux is reduced, electromagnetic noise to the first cylindrical member 13 and the second cylindrical member 23 can be reduced. As a result, malfunctions and damages of devices connected to the bearing device 10 and external devices can be prevented. Can be prevented.

  Moreover, even if electromagnetic noise acts on the first cylindrical member 13 or the second cylindrical member 23 to generate current, the first electromagnetic induction module (18, 20a) and the second electromagnetic induction module (28, 30a) can be prevented from flowing current. As a result, it is possible to prevent erroneous transmission of power and signals due to electromagnetic wave noise, and it is possible to prevent malfunction and damage of the device.

  Further, since the first electrical insulator 16 and the second electrical insulator 26 are dielectrics, a capacitor is constituted by the pot core 18, the first electrical insulator 16 and the first cylindrical member 13, and the pot core 28 and the second electrical insulation. The body 26 and the second cylindrical member 23 constitute a capacitor. If the capacitance of these capacitors is large, the impedance between the pot cores 18 and 28 and the cylindrical members 13 and 23 becomes small, and current easily flows between the pot cores 18 and 28 and the cylindrical members 13 and 23. However, in the bearing device 10 of the first embodiment, the thickness of the electrical insulators 16 and 26 is appropriately set, the distance between the pot cores 18 and 28 and the cylindrical members 13 and 23 is set appropriately, and the capacitance of the capacitor is controlled. Yes. For this reason, it is suppressed that an electric current flows between the pot cores 18 and 28 and the cylindrical members 13 and 23, and the energy loss is made small. Thereby, energy efficiency can be improved.

  Further, since the electrical insulators 16 and 26 having low thermal conductivity are disposed between the pot cores 18 and 28 and the cylindrical members 13 and 23, heat is transferred between the pot cores 18 and 28 and the cylindrical members 13 and 23. It becomes difficult to be done. For this reason, it is suppressed that the heat generated by the loss of electromagnetic induction is transmitted to the cylindrical members 13 and 23 side, and at the same time, the frictional heat generated in the cylindrical members 13 and 23 is suppressed to be transmitted to the pot cores 18 and 28 side. can do.

  Further, in the bearing device 10 described above, since the pot core 18 of the first electromagnetic induction module (18, 20a) and the pot core 28 of the second electromagnetic induction module (28, 30a) are arranged to face each other, the first electromagnetic induction module ( 18, 20a) and the closed magnetic field is easily formed in the pot cores 18, 28 of the second electromagnetic induction module (28, 30a). For this reason, the amount of leakage magnetic flux is reduced, and the transmission efficiency of signals or power can be increased.

  The bearing device 10 of the first embodiment described above can be designed in the same manner as a conventionally known bearing device in terms of the outer diameter and the like. In this case, a function of transmitting signals and electric power from the rotation side to the support side can be provided only by replacing the conventional bearing device with the bearing device 10 of the first embodiment.

  As shown in FIG. 2, the bearing device 40 of the second embodiment is different from the bearing device 10 of the first embodiment in that an electromagnetic induction module that transmits electric power and an electromagnetic induction module that transmits signals are separately provided. Other points have the same configuration as the bearing device 10 of the first embodiment. For this reason, about the part of the same structure as the bearing apparatus 10 of Example 1, the code | symbol same as the bearing apparatus 10 of Example 1 is attached | subjected, and the detailed description is abbreviate | omitted.

  In the bearing device 40 of the second embodiment, a first power electromagnetic induction module 44 and a first signal electromagnetic induction module 46 are attached to the first cylindrical member 13 via an electrical insulator 43. The first power electromagnetic induction module 44 and the first signal electromagnetic induction module 46 are arranged side by side in the radial direction of the rotation axis. On the other hand, a second power electromagnetic induction module 48 and a second signal electromagnetic induction module 50 are attached to the second cylindrical member 23 via an electrical insulator 47. The second power electromagnetic induction module 48 and the second signal electromagnetic induction module 50 are arranged side by side in the radial direction of the rotation axis. The second power electromagnetic induction module 48 faces the first power electromagnetic induction module 44, and the second signal electromagnetic induction module 50 faces the first signal electromagnetic induction module 46. Each electromagnetic induction module 44, 46, 48, 50 is configured by pot cores 44a, 46a, 48a, 50a and coils 44b, 46b, 48b, 50b wound around the pot cores 44a, 46a, 48a, 50a. Electric power is transmitted by the first power electromagnetic induction module 44 and the second power electromagnetic induction module 48, and signals are transmitted by the first signal electromagnetic induction module 46 and the second signal electromagnetic induction module 50. Therefore, the bearing device 40 according to the second embodiment can transmit signals and electric power.

  Further, the lead-out wiring 44c of the first power electromagnetic induction module 44 and the lead-out wiring 46c of the first signal electromagnetic induction module 46 penetrate the seal member 14 and are led out to the outside. For this reason, it is not necessary to provide a space for wiring in the cylindrical portion 12 of the first cylindrical member 13, and it is not necessary to provide a space for routing the wiring on the rotating shaft fixed to the first cylindrical member 13. As a result, it is not necessary to perform machining for wiring on the first cylindrical member 13 and the rotating shaft, and the strength thereof is not reduced. The lead wire 48c of the second power electromagnetic induction module 48 and the lead wire 50c of the second signal electromagnetic induction module 50 penetrate the cylindrical portion 22 of the second cylindrical member 23 and are led out to the outside.

  As shown in FIG. 3, the bearing device 60 of the third embodiment has substantially the same configuration as the bearing device 40 of the second embodiment, and only the positions where the electromagnetic induction modules 44, 46, 48, 50 are arranged. Is different. For this reason, about the part of the same structure as the bearing apparatus 40 of Example 2, the same code | symbol as the bearing apparatus 40 of Example 2 is attached | subjected, and the detailed description is abbreviate | omitted.

  In the bearing device 60 of the third embodiment, the air gap 66 formed between the first power electromagnetic induction module 44 and the second power electromagnetic induction module 48, the first signal electromagnetic induction module 46, and the second signal electromagnetic wave. The gap 68 formed between the induction modules 50 is shifted in the axial direction of the rotation axis. That is, the gap 66 and the gap 68 are shifted in the axial direction of the rotation axis. For this reason, it is possible to suppress interference between the magnetic induction by the electromagnetic induction modules 44 and 48 for power and the leakage magnetic flux generated by the electromagnetic induction by the electromagnetic induction modules 46 and 50 for signals.

  As shown in FIG. 4, the bearing device 70 of the fourth embodiment is different from the bearing device 40 of the second embodiment in that the electromagnetic induction modules 44 and 48 for electric power are arranged on one side with the rolling element 32 in between, and the signal is on the other side. The difference is that the electromagnetic induction modules 46 and 50 are arranged. For this reason, about the part of the same structure as the bearing apparatus 40 of Example 2, the code | symbol same as the bearing apparatus 40 of Example 2 is attached | subjected, and the detailed description is abbreviate | omitted.

  In the bearing device 70 of the fourth embodiment, the first power electromagnetic induction module 44 and the second power electromagnetic induction module 48 are provided on one end side (the upper end side in FIG. 4) of the first cylindrical member 13, and are used for the first signal. The electromagnetic induction module 46 and the second signal electromagnetic induction module 50 are provided on the other end side (lower end side in FIG. 4) of the first cylindrical member 13. The seal members 76a, 76b, 76c, and 14 are made of an electromagnetic shielding material (for example, stainless steel). For this reason, the electromagnetic induction modules 44 and 48 for electric power are surrounded by the cylindrical portions 12 and 22 and the seal members 14 and 76c to perform electromagnetic shielding. On the other hand, the electromagnetic induction modules 46 and 50 for signals are surrounded by the cylindrical portions 12 and 22 and the seal members 76a and 76b, and electromagnetic shielding is performed. Therefore, it is possible to suppress interference between the magnetic induction by the electromagnetic induction modules 44 and 48 for power and the leakage magnetic flux generated by the electromagnetic induction by the electromagnetic induction modules 46 and 50 for signals.

  As shown in FIG. 5, the bearing device 90 of the fifth embodiment has substantially the same configuration as the bearing device 10 of the first embodiment, and only the configuration of the electromagnetic induction modules 94 and 98 is different. For this reason, about the part of the same structure as the bearing apparatus 10 of Example 1, the detailed description is abbreviate | omitted by attaching | subjecting the code | symbol same as the bearing apparatus 10 of Example 1. FIG.

  In the bearing device 90 of the fifth embodiment, the electromagnetic induction module 94 is attached to the first cylindrical member 13. The electromagnetic induction module 94 includes a pot core 94a, a signal coil 94c wound around the pot core 94a, and a power coil 94b wound around the pot core 94a. On the other hand, the electromagnetic induction module 98 is attached to the second cylindrical member 23, and has a pot core 98a, a signal coil 98c wound around the pot core 98a, and a power coil 98b wound around the pot core 98a. ing. Signal transmission is performed by the pot cores 94a and 98a and the signal coils 94c and 98c, and electric power is transmitted by the pot cores 94a and 98a and the power coils 94b and 98b.

  In this bearing device 90, since two coils (94b, 94c) or (98b, 98c) are wound around one pot core 94a or 98a, the space of the electromagnetic induction modules 94 and 98 can be reduced accordingly. . Thereby, the bearing device 90 can be reduced in size.

  As shown in FIG. 6, the bearing device 110 according to the sixth embodiment has substantially the same configuration as the bearing device 10 according to the first embodiment, and includes electromagnetic induction modules (18, 20a), (28, 30a) and a cylinder. The only difference is that the electromagnetic shields 114 and 120 are disposed between the members 13 and 23. For this reason, about the part of the same structure as the bearing apparatus 10 of Example 1, the code | symbol same as the bearing apparatus 10 of Example 1 is attached | subjected, and the detailed description is abbreviate | omitted.

  In the bearing device 110 according to the sixth embodiment, the electromagnetic shields 114 and 120 are attached to the cylindrical members 13 and 23 via the fixing members 112 and 118. Electromagnetic induction modules (18, 20a), (28, 30a) are attached to the electromagnetic shields 114, 120 via electrical insulators 116, 122. The electromagnetic shields 114 and 120 are made of an electromagnetic shielding material (for example, aluminum). The electromagnetic shield 114 covers all surfaces of the electromagnetic induction module (18, 20a) except for the surface facing the electromagnetic induction module (28, 30a). Moreover, the electromagnetic shielding body 120 has covered all the surfaces except the surface facing an electromagnetic induction module (18, 20a) among electromagnetic induction modules (28, 30a).

  In this bearing device 110, the electromagnetic induction modules (18, 20a), (28, 30a) are surrounded by electromagnetic shields 114, 120, and further, the first cylindrical member 13, the second cylindrical member 23, and the sealing members 14, 24a. Surrounded by That is, the electromagnetic induction modules (18, 20a) and (28, 30a) are double-shielded. For this reason, unintended power transmission and erroneous signal transmission due to electromagnetic noise can be effectively suppressed. Moreover, even if a malfunction occurs in one electromagnetic shielding for some reason, the influence of electromagnetic noise can be reduced by the other electromagnetic shielding. For this reason, the reliability of electric power transmission or signal transmission can be improved.

  In particular, in the bearing device 110 described above, the gap 36b between the seal member 14 and the second cylindrical member 23 and the gap 36a between the seal member 24a and the first cylindrical member 13 have portions extending in the axial direction. In contrast, the gap between the first electromagnetic induction module (18, 20a) and the second electromagnetic induction module (28, 30a) extends perpendicular to the axial direction. That is, both are orthogonal. Since electromagnetic waves have a straight traveling property, they can be prevented from affecting each other when they are orthogonal to each other. That is, the electromagnetic noise generated outside is suppressed from affecting the electromagnetic induction modules (18, 20a), (28, 30a), and is also generated in the electromagnetic induction modules (18, 20a), (28, 30a). Electromagnetic noise is prevented from acting on external devices. As a result, malfunction or damage of the external device can be suitably prevented.

  As shown in FIG. 7, the bearing device 130 of the seventh embodiment has substantially the same configuration as the bearing device 40 of the second embodiment, and the electromagnetic induction modules 44, 46, 48, 50 and the cylindrical members 13, 23. Is different only in that electromagnetic shields 132 and 138 are disposed between the two. For this reason, about the part of the same structure as the bearing apparatus 40 of Example 2, the code | symbol same as the bearing apparatus 40 of Example 2 is attached | subjected, and the detailed description is abbreviate | omitted.

  In the bearing device 130 of the seventh embodiment, electromagnetic shields 132 and 138 are attached to the cylindrical members 13 and 23. The electromagnetic shields 132 and 138 are made of an electromagnetic shielding material (for example, aluminum). Electromagnetic induction modules 46 and 44 are attached to the electromagnetic shield 132 via electrical insulators 134 and 136. The electromagnetic shield 132 covers all surfaces of the electromagnetic induction modules 46 and 44 except for the surface facing the electromagnetic induction modules 50 and 48. The electromagnetic shield 132 is formed with a partition wall 134 a that protrudes from an intermediate position between the electromagnetic induction modules 46 and 44 toward the electromagnetic shield 138. On the other hand, electromagnetic induction modules 50 and 48 are attached to the electromagnetic shield 138 via electrical insulators 140 and 142. The electromagnetic shield 138 covers all surfaces of the electromagnetic induction modules 50 and 48 except for the surface facing the electromagnetic induction modules 46 and 44. The electromagnetic shield 138 is formed with a recess 138 a at an intermediate position between the electromagnetic induction modules 50 and 48. A partition wall 134 a of the electromagnetic shield 134 is positioned in the recess 138 a of the electromagnetic shield 138.

  In the bearing device 130, the partition wall 134 a is located between the electromagnetic induction modules 44 and 48 and the electromagnetic induction modules 46 and 50. Therefore, the magnetic flux leaking from the electromagnetic induction modules 44 and 48 can be prevented from affecting the electromagnetic induction modules 46 and 50, and the magnetic flux leaking from the electromagnetic induction modules 46 and 50 has an influence on the electromagnetic induction modules 44 and 48. Giving can be prevented.

  As shown in FIG. 8, the bearing device 150 of the eighth embodiment has substantially the same configuration as the bearing device 130 of the seventh embodiment, and each of the inner peripheral surface of the cylindrical member 153 and the outer peripheral surface of the cylindrical member 155. The only difference is that a step is formed. For this reason, portions having the same configuration as the bearing device 130 of the seventh embodiment are denoted by the same reference numerals as those of the bearing device 130 of the seventh embodiment, and detailed description thereof is omitted.

  In the bearing device 150 of the eighth embodiment, a support portion 152a to which a rotation shaft (not shown) is attached on the inner peripheral surface of the first cylindrical member 153, and a non-contact state that makes no contact with the rotation shaft attached to the support portion 152a. A portion 152b is formed. The non-contact portion 152b is shifted outward in the radial direction with respect to the support portion 152a and is continuously formed in the axial direction. The rolling element 32 is in contact with the outer peripheral surface of the first cylindrical member 153 at the position where the support portion 152a is provided. The electromagnetic induction modules 44 and 46 are attached to the outer peripheral surface of the first cylindrical member 153 at the position where the non-contact portion 152b is provided.

  Further, on the outer peripheral surface of the second cylindrical member 155, a first outer peripheral surface 154a to which a support body (not shown) is attached, and a second outer peripheral surface 154b arranged in parallel with the first outer peripheral surface 154a in the axial direction are formed. . The second outer peripheral surface 154b is shifted radially inward with respect to the first outer peripheral surface 154a. The rolling element 32 is in contact with the inner peripheral surface of the second cylindrical member 155 at the position where the first outer peripheral surface 154a is provided. The electromagnetic induction modules 48 and 50 are attached to the inner peripheral surface of the second cylindrical member 155 at the position where the second outer peripheral surface 154b is provided.

  In the bearing device 150 described above, the first cylindrical member 153 and the rolling element 32 are in contact with each other at a position where the support portion 152a where the rotation shaft and the first cylindrical member 153 are in contact is provided. In addition, the second cylindrical member 155 and the rolling element 32 are in contact with each other at a position where the first outer peripheral surface 154a where the support and the second cylindrical member 155 are in contact is provided. That is, the first cylindrical member 153 does not come into contact with the rotating shaft at the non-contact portion 152b away from the part that contacts the rolling element 32, and the second cylindrical member 155 is the second part away from the part that comes into contact with the rolling element 32. The outer peripheral surface 54b does not contact the support. For this reason, it can prevent that an excessive moment acts on the 1st cylindrical member 153 and the 2nd cylindrical member 155, and can prevent damage etc. of these members 153,155.

  Moreover, since the deformation | transformation of the site | part to which the electromagnetic induction modules 44, 46, 48, and 50 of the cylindrical members 153 and 155 are attached is prevented, the positional relationship of the electromagnetic induction modules 44, 46, 48, and 50 is kept constant. As a result, power transmission and signal transmission by the electromagnetic induction modules 44, 46, 48, and 50 can be stably performed. Moreover, it can prevent that external force acts on electromagnetic induction module 44,46,48,50 itself, and can prevent damage to electromagnetic induction module 44,46,48,50.

  Further, by providing the non-contact portion 152b, a gap is formed between the inner peripheral surface of the first cylindrical member 153 and the rotation shaft, and the outer periphery of the second cylindrical member 155 is provided by providing the second outer peripheral surface 154b. A gap is formed between the surface and the support. For this reason, the heat dissipation of the 1st cylindrical member 153 and the 2nd cylindrical member 155 can be improved. Thereby, solidification of the lubricant and deformation of each member due to heat can be prevented.

  As shown in FIG. 9, the bearing device 160 of the ninth embodiment has substantially the same configuration as the bearing device 150 of the eighth embodiment, and each of the inner peripheral surface of the cylindrical member 153 and the outer peripheral surface of the cylindrical member 155. The only difference is that the heat dissipating fins 152c and 154c are formed. For this reason, about the part of the same structure as the bearing apparatus 150 of Example 8, the code | symbol same as the bearing apparatus 150 of Example 8 is attached | subjected and the detailed description is abbreviate | omitted.

  As shown in FIG. 9, the non-contact part 152b of the 1st cylindrical member 153 is provided with the radiation fin 152c. In addition, heat radiation fins 164 c are provided on the second outer peripheral surface 154 b of the second cylindrical member 155. Thereby, the heat dissipation of the cylindrical members 153 and 155 is improved, and the occurrence of problems due to the high temperature of the bearing device 160 can be prevented.

  As shown in FIG. 10, the bearing device 170 of the tenth embodiment is different from the bearing device 160 of the ninth embodiment only in that a sensor 172 is provided. For this reason, portions having the same configuration as the bearing device 160 of the ninth embodiment are denoted by the same reference numerals as those of the bearing device 160 of the ninth embodiment, and detailed description thereof is omitted.

  As shown in FIG. 10, a sensor 172 is attached to the first cylindrical member 153. The sensor 172 is a sensor that detects the state of a member in contact with the first cylindrical member 153 such as the state of the first cylindrical member 153 and the state of the rotation shaft attached to the first cylindrical member 153. For the sensor 172, for example, a thermocouple, thermistor, strain gauge, acceleration sensor, or the like can be used. For example, when a thermocouple is used for the sensor 172, the thermal state of the rotating shaft or the first cylindrical member 153 can be detected.

  The sensor 172 is connected to lead wires 44c and 46c. The sensor 172 is operated by the electric power transmitted from the second cylindrical member 155 side to the first cylindrical member 153 side by the electromagnetic induction of the electromagnetic induction modules 50 and 46. The signal output from the sensor 172 is transmitted from the first cylindrical member 153 side to the second cylindrical member 155 side by electromagnetic induction of the electromagnetic induction modules 44 and 48. For this reason, the external apparatus provided in the 2nd cylindrical member 155 side can monitor the state of a rotating shaft and / or the 1st cylindrical member 153 in substantially real time. As a result, an abnormality occurring in the bearing device 170 can be detected, and damage to the bearing device 170 or equipment connected thereto can be prevented.

  As mentioned above, although the bearing apparatus of Examples 1-10 was demonstrated, these bearing apparatuses can be used for various uses. For example, as shown in FIG. 11, it can be used for a universal joint that transmits the rotation of the first rotation shaft 242 to the second rotation shaft 252. For example, the bearing device of Examples 1 to 10 can be used for a bearing device that supports the shaft tip portion of the cross spider 246 disposed between the first rotating shaft 242 and the second rotating shaft 252. That is, the cross spider 246 includes a first shaft portion 250 whose both ends are rotatably supported by the first rotating shaft 242 and a second shaft portion 248 whose both ends are rotatably supported by the second rotating shaft 252. And the first shaft portion 250 and the second shaft portion 248 intersect each other. Between at least one end of the first shaft portion 250 and the first rotating shaft 242, the bearing device (not shown) according to any of the first to tenth embodiments is disposed. Further, between at least one end of the second shaft portion 248 and the second rotating shaft 252, any one of the bearing devices (not shown) of the first to tenth embodiments is disposed. In the bearing device disposed on the first shaft portion 250, the first cylindrical member is attached to one end of the first shaft portion 250, and the second cylindrical member is attached to the first rotating shaft. In the bearing device disposed on the second shaft portion 248, the first cylindrical member is attached to one end of the second shaft portion 248, and the second cylindrical member is attached to the second rotating shaft 252. And the electromagnetic induction module attached to the 1st axial part 250 and the electromagnetic induction module attached to the 2nd axial part 248 are connected by wiring. As a result, the electric power and / or signal transmitted from the first rotating shaft 242 side to the first shaft portion 250 side (that is, the cross spider 246) by electromagnetic induction is transmitted to the second shaft portion 248 side via the wiring. The Further, the power and / or signal transmitted to the second shaft portion 248 side is transmitted to the second rotating shaft 252 side by electromagnetic induction. Thereby, electric power or a signal is transmitted from the first rotating shaft 242 side to the second rotating shaft 252 side.

  A sensor may be installed in the cross spider, and power may be supplied to the sensor from the first rotating shaft side or the second rotating shaft side by a bearing device. In this case, the output signal from the sensor is transmitted to the first rotating shaft side or the second rotating shaft side via the bearing device. Thereby, the state of the universal joint can be monitored in substantially real time on the first rotating shaft side or the second rotating shaft side. As a result, when an abnormality occurs in the universal joint, an appropriate measure can be taken, and the universal joint can be prevented from being damaged.

  Moreover, the bearing apparatus of Examples 1-10 can be used suitably for the wind power generator 180 as shown in FIG. The wind power generator 180 includes a blade 182 that rotates by receiving wind, and a rotating member 210 to which the blade 182 is fixed. The rotation of the rotating member 210 is transmitted to the drive shaft 196 through a gear mechanism (188, 208, 194, 202). The generator 198 is driven by the rotation of the drive shaft 196. One end of an attachment rod 204 is attached to the rotating member 210 so as to be relatively rotatable. The other end of the mounting rod 204 is rotatably attached to the tower 192. In this configuration, the bearing device according to any one of the first to tenth embodiments is used for the bearing device 206 disposed between the rotating member 210 and the mounting rod 204 and / or the bearing device 190 disposed between the mounting rod 204 and the tower 192. Can be used. By using a bearing device capable of transmitting electric power and signals to the bearing devices 190 and 206, electric power and signals can be transmitted between the tower 192 side and the control board 184 on the rotating member 210 side. In addition, about the detailed structure of a wind power generator, the structure disclosed by patent 3679801 is employable, for example.

  Furthermore, the bearing apparatus of Examples 1-10 can be used for the axle apparatus shown in FIG. That is, the axle device 220 includes an axle 226, a bearing device 222, and a support member 234 that rotatably supports the axle 226 via the bearing device 222. Any of the bearing devices of Examples 1 to 10 can be used for this bearing device 222. A wheel 230 is attached to the tip of the axle 226. A sensor 228 for detecting the state of the wheel 230 is attached to the wheel 230. As the sensor 228, for example, a thermocouple, thermistor, strain gauge, acceleration sensor, encoder, or the like can be used. By using the bearing device of the embodiment that can transmit electric power and signals to the bearing device 222, it is possible to supply electric power to the sensor 228 attached to the wheel 230 from the support member 234 side, and from the sensor 228. This signal can be transmitted to the support member 234 side.

  In addition, it is not restricted to the application example mentioned above, The bearing apparatus of Examples 1-10 can be used as a bearing apparatus of a general machine (for example, the rotating part of a machine tool, or the indirect part of a robot). By using the bearing devices of Examples 1 to 10, electric power or signals can be transmitted from the rotation side to the fixed side and / or from the fixed side to the rotation side.

  Although several embodiments of the present invention have been described in detail above, these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. For example, in each of the embodiments described above, the rotating shaft (rotating side) is attached to the inner cylindrical member, and the support (fixed side) is attached to the outer cylindrical member. However, in the bearing device disclosed in the present application, the support (fixed side) may be attached to the inner cylindrical member, and the rotation shaft (rotation side) may be attached to the outer cylindrical member.

  In addition, the technical elements described in the present specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology illustrated in the present specification or the drawings achieves a plurality of objects at the same time, and has technical utility by achieving one of the objects.

10: Bearing device 13: First cylindrical members 14, 24a, 24b: Seal members 16, 26: Electrical insulators 18, 28: Pot cores 20a, 30a: Coil 23: Second cylindrical member

Claims (13)

A first cylindrical member;
A rolling element in contact with the outer peripheral surface of the first cylindrical member;
A second cylindrical member disposed on the outer side of the first cylindrical member, with a rolling element in contact with the inner peripheral surface thereof, and supporting the first cylindrical member so as to be relatively rotatable;
A first electromagnetic induction module attached to the first cylindrical member;
A first electrical insulator disposed between the first cylindrical member and the first electromagnetic induction module and electrically insulating the first cylindrical member and the first electromagnetic induction module;
A second electromagnetic induction module attached to the second cylindrical member and disposed at a position facing the first electromagnetic induction module;
A second electrical insulator disposed between the second cylindrical member and the second electromagnetic induction module and electrically insulating the second cylindrical member and the second electromagnetic induction module ;
A first attachment portion to which the first cylinder side member is attached is formed on the inner peripheral surface of the first cylindrical member, and a second attachment portion to which the second cylinder side member is attached to the outer peripheral surface of the second cylindrical member. Is formed,
When the first cylinder side member is attached to the first attachment portion and the second cylinder side member is attached to the second attachment portion, the first cylinder side member and the second cylinder side member are the first cylinder member, the rolling element, and the second member. Relative rotation is possible via a cylindrical member,
On the outer peripheral surface of the first cylindrical member, a first support part that contacts the rolling elements and a first electromagnetic induction module attachment part to which the first electromagnetic induction module is attached are formed.
On the inner peripheral surface of the second cylindrical member, there are a second support portion that contacts the rolling element and supports the first cylindrical member so as to be relatively rotatable, and a second electromagnetic induction module attachment portion to which the second electromagnetic induction module is attached. Formed,
The first support part and the first electromagnetic induction module mounting part are arranged side by side in the axial direction of the first cylindrical member,
The second support part and the second electromagnetic induction module mounting part are arranged side by side in the axial direction of the second cylindrical member,
At the position where the first support portion is formed on the outer peripheral surface of the first cylindrical member, the first mounting portion to which the first cylindrical side member is attached is formed on the inner peripheral surface,
The bearing device in which the position of the inner peripheral surface is shifted outward from the position of the first mounting portion at a position where the first electromagnetic induction module mounting portion is formed on the outer peripheral surface of the first cylindrical member . The outer peripheral surface of the second cylindrical member at the position where the second electromagnetic induction module mounting portion is formed is shifted inward from the outer peripheral surface of the second cylindrical member at the position where the second support portion is formed, according to claim 1 The bearing device described in 1. The bearing device according to claim 1 or 2 , wherein a radiation fin is provided on at least one of an inner peripheral surface of the first cylindrical member and an outer peripheral surface of the second cylindrical member. A first electromagnetic shield disposed between the first cylindrical member and the first electrical insulator; and a second electromagnetic shield disposed between the second cylindrical member and the second electrical insulator. ,
The first electrical insulator is disposed between the first electromagnetic induction module and the first electromagnetic shield, and the second electrical insulator is disposed between the second electromagnetic induction module and the second electromagnetic shield. And
further,
The first cylindrical member and the second cylindrical member are each formed of an electromagnetic shielding material,
Between the first cylindrical member and the second cylindrical member, an accommodation space is formed that is surrounded by the first cylindrical member and the second cylindrical member,
The first electromagnetic induction module, the first electromagnetic shield, the first electrical insulator, the second electromagnetic induction module, the second electromagnetic shield, and the second electrical insulator are accommodated in the accommodation space. 4. The bearing device according to any one of 3 . Between the 1st cylindrical member and the 2nd cylindrical member, the crevice which connects the storage space and the exterior of a bearing device is formed,
The first electromagnetic shield covers all surfaces of the first electromagnetic induction module except for the surface facing the second electromagnetic induction module,
The second electromagnetic shield covers all surfaces of the second electromagnetic induction module except for the surface facing the first electromagnetic induction module,
The at least part of the gap is orthogonal to a surface of the first electromagnetic induction module facing the second electromagnetic induction module and orthogonal to a surface of the second electromagnetic induction module facing the first electromagnetic induction module. 4. The bearing device according to 4 . A sensor and an electronic circuit are attached to one of the first cylindrical member and the second cylindrical member ,
The sensor and the electronic circuit are operated by electric power transmitted from the electromagnetic induction module on the other cylindrical member side to the electromagnetic induction module on the one cylindrical member side,
The electronic circuit receives a signal from the sensor and a signal transmitted from the electromagnetic induction module on the other cylindrical member side to the electromagnetic induction module on the one cylindrical member side,
Signal output from the signal and the sensor output from the electronic circuit is transmitted from the electromagnetic induction module of one of the cylindrical member-side electromagnetic induction module of the other cylindrical member, according to any one of claims 1 to 5 Bearing device. The first electromagnetic induction module includes a first power coil for transmitting power, a first signal coil for transmitting a signal, a first power coil, and a first signal coil. Two first cores,
The second electromagnetic induction module opposes the first power coil and transmits a second power coil to transmit power, and the second signal coil to transmit the signal facing the first signal coil. The bearing device according to any one of claims 1 to 6 , further comprising a second core on which the second power coil and the second signal coil are wound. The first electromagnetic induction module includes a first power coil for transmitting power, a first signal coil for transmitting a signal, a first power core around which the first power coil is wound, A first signal core on which the first signal coil is wound, the first power core and the first signal core are arranged side by side in the radial direction of the first cylindrical member;
The second electromagnetic induction module opposes the first power coil and transmits a second power coil to transmit power, and the second signal coil to transmit the signal facing the first signal coil. And a second power core on which the second power coil is wound and a second signal core on which the second signal coil is wound, the second power core and the second signal core. Are arranged side by side in the radial direction of the second cylindrical member,
The facing surface of the first power core facing the second power core and the facing surface of the first signal core facing the second signal core are shifted in the axial direction of the first cylindrical member,
The facing surface of the second power core facing the first power core and the facing surface of the second signal core facing the first signal core are shifted in the axial direction of the second cylindrical member. The bearing apparatus as described in any one of 1-6 . A first power wiring connected to the first power coil; a first signal wiring connected to the first signal coil; a second power wiring connected to the second power coil; A second signal wiring connected to the signal coil;
The first cylindrical member has an end surface extending in a direction to close a space between the first cylindrical member and the second cylindrical member, and the first power wiring and the first signal wiring are connected to the first cylindrical member. The bearing device according to claim 7 or 8 , wherein the bearing device is drawn from an end face. A first member that rotates by receiving wind;
A second member rotatably attached to the rotating member;
A third member rotatably attached to the second member,
A wind turbine generator in which the bearing device according to any one of claims 1 to 9 is used in at least one of a connecting portion between the first member and the second member and a connecting portion between the second member and the third member. . A first rotation axis;
A second rotating shaft to which the rotation of the first rotating shaft is transmitted;
A cross spider disposed between the first rotating shaft and the second rotating shaft,
At least one end of the first shaft portion of the cross spider is rotatably attached to the first rotating shaft via the first bearing device according to any one of claims 1 to 9 ,
One of the first cylindrical member and the second cylindrical member of the first bearing device is attached to one end of the first shaft portion, and the other of the first cylindrical member and the second cylindrical member of the first bearing device is the first rotating shaft. Universal joint device attached to. At least one end of the second shaft portion of the cross spider is rotatably attached to the second rotating shaft via the second bearing device according to any one of claims 1 to 9 ,
One of the first cylindrical member and the second cylindrical member of the second bearing device is attached to one end of the second shaft portion, and the other of the first cylindrical member and the second cylindrical member of the second bearing device is the second rotating shaft. Attached to the
The electromagnetic induction module on the side attached to the first shaft portion of the first bearing device and the electromagnetic induction module on the side attached to the second shaft portion of the second bearing device are electrically connected by wiring. The universal joint device according to claim 11 . A support member;
A rotation axis;
With wheels mounted on a rotating shaft,
A bearing device according to any one of claims 1 to 9 ,
One of the first cylindrical member and the second cylindrical member of the bearing device is attached to the support member and the other is attached to the rotation shaft, and the rotation shaft is rotatably supported by the support member via the bearing device. Axle device.

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