Bearing device, spacer and manufacturing method

Abstract

The bearing device (1) includes a magnetic ring (8) fixed to the inner ring (3) and a stator (9) fixed to the outer ring (2) in opposition to the magnetic ring (8). The magnetic ring (8) and the stator (9) constitute a claw-pole type generator (G). The stator (9) includes a coil (12) and a yoke surrounding the coil (12). The yoke is constituted by combining a first member (10-1) and a second member (10-2) of a magnetic body. The first member (10-1) and the second member (10-2) have the same shape. The first member (10-1) and the second member (10-2) respectively have a plurality of second claws (10b) arranged in a comb shape. The plurality of first claws (10b) of the first member (10-1) and the plurality of second claws (10b) of the second member (10-2) are alternately arranged on a surface opposite to the magnetic ring (8).

Description

Technical Field

[0001] This invention relates to bearing assemblies, spacers, and manufacturing methods. Background Technology

[0002] It is known that generators are incorporated into bearings and used as power sources for sensors, wireless communication, etc. Japanese Patent Application Publication No. 2006-170624 (Patent Document 1) discloses a bearing with a wireless sensor, which includes a rolling bearing, a rotation sensor that also functions as a generator, and a wireless transmission circuit that wirelessly transmits the output of the rotation sensor. Existing technical documents Patent documents

[0003] Patent Document 1: Japanese Patent Application Publication No. 2006-170624 Summary of the Invention The technical problem that the invention aims to solve

[0004] Japanese Patent Application Publication No. 2006-170624 discloses a rotary sensor for a generator that integrates a bearing with a wireless sensor. This sensor consists of a magnetic encoder and a magnetic ring that internally houses the coil. Furthermore, the magnetic ring serves as the stator of the generator rotary sensor. The rotary sensor is configured as a claw-pole generator.

[0005] A magnetic ring is a ring with a generally square cross-section on a plane including the bearing shaft. The magnetic ring is formed by combining two magnetic ring components, each having a groove-shaped cross-section opening towards the shaft. The two magnetic ring components are positioned opposite each other with their openings facing each other, and are configured to abut against each other without gaps in their outer diameter portions. Thus, by eliminating gaps at the abutment of the two magnetic ring components, the magnetic reluctance in the mating portion of the magnetic circuit inside the magnetic ring is minimized.

[0006] In the magnetic ring described in Patent Document 1, two magnetic ring components with different shapes need to be prepared. Each component requires a different die for stamping, resulting in high initial manufacturing costs.

[0007] The present invention was made to solve the above-mentioned problems, and its purpose is to provide a bearing device, spacer, and a method for manufacturing them that can simplify the structure of a generator and reduce initial manufacturing costs. Technical solutions to solve technical problems

[0008] This disclosure relates to a bearing assembly or spacer that rotatably supports a rotating component. The bearing assembly or spacer includes a magnetic ring fixed to the rotating component and a stator fixed to a non-rotating component opposite to the magnetic ring. The magnetic ring and stator constitute a claw-pole generator. The stator includes a coil and a yoke surrounding the coil. The yoke is constructed by combining a first member and a second member of a magnetic body. The first member has a plurality of first claws arranged in a comb-like pattern. The second member has a plurality of second claws arranged in a comb-like pattern. The plurality of first claws and the plurality of second claws are alternately arranged on the surface opposite the magnetic ring. The first member and the second member are of the same shape. Invention Effects

[0009] In the bearing device or spacer disclosed herein, since two magnetic rings are configured as components of the same shape, only one die is needed for stamping. Therefore, initial manufacturing costs can be suppressed, and manufacturing costs can be reduced without changing the die during the manufacturing of the magnetic rings. Attached Figure Description

[0010] Figure 1 This is a cross-sectional view of the bearing device according to Embodiment 1. Figure 2 This is a diagram showing the simplified structure of generator G. Figure 3 This is a side view of the magnetic ring component 10. Figure 4 yes Figure 3 A sectional view at section IV-IV. Figure 5 This is a diagram showing the state in which two magnetic ring components 10 of the same shape are arranged opposite each other. Figure 6 This is a diagram showing the state of two magnetic ring components 10 being fitted together. Figure 7 yes Figure 6 A cross-sectional view of the two magnetic ring components after they are fitted together at point VII. Figure 8 This is a diagram showing the structure of the circuit board 14. Figure 9 It means Figure 8 A diagram of an improved example of the circuit board 14. Figure 10 This is a cross-sectional view of the bearing device 1A of a variation of Embodiment 1. Figure 11 This is a diagram illustrating the conditions for fitting the concave portion 10c and the convex portion 10d together. Figure 12 This is a diagram showing the phases used to alternately engage the slot 10a and the claw 10b. Figure 13The diagram shows another example where the number n of slots 10a and claws 10b is set to an odd number. Figure 14 This is a cross-sectional view of the bearing device 1B of the modified embodiment 1, Example 2. Figure 15 This is a side view of the magnetic ring member 10A used in Embodiment 2. Figure 16 Observe from the XVI arrow Figure 15 The diagram shows the magnetic ring component 10A. Figure 17 This indicates the state in which two magnetic ring components 10A of the same shape are arranged opposite each other. Figure 18 This indicates the state of two magnetic ring components 10A being fitted together. Figure 19 It is a sectional view of the stator in a plane containing the axis of rotation. Figure 20 It is a sectional view of the stator in other planes containing the axis of rotation. Figure 21 This is a cross-sectional view showing a simplified structure of the bearing assembly of a claw pole generator applied to a spindle assembly. Figure 22 yes Figure 21 An enlarged view of the main part on the left side. Detailed Implementation

[0011] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Furthermore, in the following drawings, the same or equivalent parts will be labeled with the same reference numerals, and will not be described repeatedly.

[0012] [Implementation Method 1] Figure 1 This is a cross-sectional view of the plane of the shaft containing the bearing device of Embodiment 1. As... Figure 1 The bearing assembly 1 shown illustrates a bearing with a wireless sensor. Bearing assembly 1 includes a bearing B, an outer ring 7, a magnetic ring 8, and a stator 9. Bearing B includes an outer wheel 2, an inner wheel 3, rolling elements 4, a retainer 5, and a seal 6. The outer ring 7 is fixed to the inner diameter surface of the outer wheel 2. The magnetic ring 8 is fixed to the outer diameter surface of the inner wheel 3. The stator 9 is fixed to the inner diameter surface of the outer ring 7 opposite to the magnetic ring 8.

[0013] The generator G consists of a magnetic ring 8 and a stator 9. The generator G is a claw-pole generator. The bearing B is, for example, a deep-groove ball bearing with rolling elements 4. Here, we will illustrate with an example of an inner-wheel rotating type where the inner wheel 3 is the rotating wheel and the outer wheel 2 is the stationary wheel.

[0014] The magnetic ring 8 includes a core 8a and a multipole magnet 8b. The multipole magnet 8b is, for example, made by vulcanizing and bonding a magnetic material composed of magnetic powder and rubber to the core 8a, then alternately magnetizing the N and S poles, and fixing it to the inner wheel (rotating wheel) 3.

[0015] The stator 9 includes two magnetic ring members 10-1 and 10-2 of the same shape, a winding tube 11, and coils 12. A plurality of coils 12 are wound around the circumference of the winding tube 11. An example using the winding tube 11 is shown here, but the stator can be constructed similarly even with coils not using the winding tube 11.

[0016] A resin housing 13 is fixed to the inner diameter surface of the outer ring 7, adjacent to the generator G. A circuit board 14 is fixed to the housing 13. The circuit board 14 is equipped with a power supply circuit 15 that rectifies and converts the alternating current generated by the generator G into direct current, a sensor 16 that monitors the state of the bearing B, and a wireless communication circuit 17 that wirelessly transmits the output of the sensor 16 to the outside. The ends 12a (the starting point of winding) and 12b (the ending point of winding) of the coil 12 are connected to the circuit board 14. When the inner wheel 3 rotates, the alternating current output from the generator G is converted into direct current by the power supply circuit 15. Furthermore, a cover 18 for protecting the circuit board 14 is made of a non-magnetic insulator such as resin and is fixed to the outer ring 7, for example. Alternatively, instead of the cover 18, the surface of the circuit board 14 can be sealed with a resin molding compound.

[0017] The circuit board 14, on which the wireless communication circuit 17 is mounted, is surrounded by a non-magnetic insulator such as resin. Because it is made of magnetic material and there are no conductors disposed on the cover 18 side of the circuit board 14, wireless communication is possible.

[0018] Furthermore, the housing 13 is located between the bearing B and the circuit board 14. In cases where the temperature of the bearing B may rise due to friction during rotation, using a resin material with low thermal conductivity for the housing 13 can suppress the temperature rise of the circuit board 14. For example, using a material with excellent thermal insulation properties, such as a resin containing fine air bubbles, is effective in suppressing temperature rise.

[0019] Although seal 6 is not installed on the side of the fixed magnetic ring 8 of bearing B, a labyrinth seal (non-contact seal) structure is formed by narrowing the gap between the magnetic ring 8 and components such as stator 9 and housing 13, thus preventing the intrusion of foreign objects. If necessary, grooves or other features can be provided on any opposing surfaces to improve sealing performance, or a contact seal can be provided.

[0020] Figure 2This is a diagram showing a simplified structure of generator G. Generator G is a claw-pole generator. The magnetic rotor is composed of a ring-shaped multipole magnet 8b. Furthermore, the stator 9 consists of a coil 12 and a yoke surrounding the coil 12. The yoke is composed of magnetic ring members 10-1 and 10-2. Magnetic flux emanating from the N pole of the multipole magnet 8b enters the yoke through the claw 10b, which serves as a magnetic pole, and then enters the S pole of the multipole magnet 8b around the coil through the claw 10b, which serves as an adjacent magnetic pole. When the positions of the N and S poles of the multipole magnet 8b are interchanged according to the rotation angle of the magnetic rotor, the direction of the magnetic flux is reversed. An alternating voltage is generated across the coil 12 by the alternating magnetic field produced in this way.

[0021] Figure 3 This is a side view of the magnetic ring component 10. Figure 4 yes Figure 3 A sectional view at section IV-IV. (Refer to...) Figure 3 and Figure 4 At one end of the magnetic ring member 10, the groove 10a and claw 10b facing the axial opening are alternately arranged in a comb-like configuration.

[0022] A recess 10c and a protrusion 10d are formed on the end face 10f of the magnetic ring member 10. The positions of the recess 10c and the protrusion 10d are designed such that when two magnetic ring members 10-1 and 10-2 of the same shape are opposite each other and the claws 10b are alternately arranged, the protrusion 10d of the other magnetic ring member 10-2 is disposed on the recess 10c of one magnetic ring member 10-1.

[0023] It is sufficient to have at least one concave portion 10c and one convex portion 10d, but if Figure 3 As shown, multiple settings can also be configured. For example, if a formation... Figure 3 The protrusion 10d shown in circle V1 and the concave portion 10c shown in circle V2 can be assembled. However, in this embodiment, considering the balance during assembly, Figure 3 Two concave portions 10c and two convex portions 10d are formed in the middle.

[0024] In addition, a hole 10e is formed on the side of the magnetic ring member 10 to lead the ends 12a and 12b of the coil 12 to the outside.

[0025] Figure 5 This is a diagram showing the state in which two magnetic ring components 10 of the same shape are arranged opposite each other. In fact, the winding tube 11 with the coil 12 is housed in the space between two magnetic ring members 10-1 and 10-2, but the winding tube 11 with the coil 12 is omitted here because it would make the diagram more complicated.

[0026] In addition, the number of magnetized poles obtained by adding the N pole and S pole of magnetic ring 8 is equal to... Figure 6 The number of claws 10b in each state is the same.

[0027] Figure 6 This is a diagram showing the state of two magnetic ring components 10 being fitted together. Figure 7 It is the result of two magnetic ring components fitting together in the plane of the rotating shaft containing the bearing. Figure 6 A cross-sectional view of section VII. Additionally, the winding tube 11 and coil 12 are connected with... Figure 1 The same configuration is placed inside the stator, but in Figure 7 The winding tube 11 and coil 12 shown in the diagram are omitted.

[0028] Two magnetic ring components 10-1 and 10-2 with the same shape are used. The recesses 10c and protrusions 10d provided on the end faces 10f of each magnetic ring component 10 engage with each other so that the claws 10b provided on each magnetic ring component 10 are alternately arranged.

[0029] On the end face 10f of the magnetic ring member 10, an equal number of recesses 10c and protrusions 10d are formed. If the recesses 10c and protrusions 10d are fitted together and the end faces 10f abut against each other, the phases of the arrangement are easily aligned, resulting in uniform gaps between the claws 10b of each magnetic ring member 10. Furthermore, since multiple recesses 10c and protrusions 10d are arranged in the circumferential direction, the magnetic ring members 10 can be fixed in a manner that prevents them from shifting circumferentially.

[0030] The end faces 10f of the two magnetic ring members 10 abut each other without gap, thereby forming a magnetic circuit. However, it is assumed that even if a gap is generated, if the outer ring 7 is made of magnetic material, the outer ring 7 can also be used as a magnetic circuit, so the magnetic reluctance of the yoke can be suppressed to a small value.

[0031] By designing the two magnetic ring components 10-1 and 10-2 as identical parts, initial manufacturing costs can be kept low since only one die is needed during stamping. Furthermore, even during the manufacturing of the magnetic rings, manufacturing costs can be reduced by minimizing the time spent changing dies.

[0032] Furthermore, by providing the recess 10c and the convex portion 10d, the phase alignment of the two magnetic rings is facilitated during assembly, and the gaps between each claw 10b can be uniformly configured, thereby facilitating assembly.

[0033] Furthermore, since the recesses 10c and protrusions 10d provided on the two magnetic ring members 10 fit together, the two magnetic ring members 10 can be easily assembled without bonding or welding.

[0034] Furthermore, to achieve a more secure fit, plastic processing such as caulking (not shown) can be added to the fitting portion, and elastic deformation can also be performed on the fitting portion. Thus, by ensuring a secure fit, the magnetic resistance in the fitting portion of the two magnetic ring members 10 is further reduced, thereby improving power generation performance.

[0035] In this Figures 2 to 7 In the case of the magnetic ring member 10 shown, the outer diameters of the two magnetic ring members 10-1 and 10-2 arranged opposite each other are approximately the same, so the end faces 10f can fit tightly together, thereby reducing magnetic resistance. In addition, since there are no steps on the outer diameter, it is convenient to insert the stator 9 into the outer ring 7 during assembly.

[0036] In addition, the magnetic ring component 10 is generally manufactured by stamping a thin sheet of magnetic material using a mold. However, besides this method, it can also be injection molded from resin material, and then the magnetic material can be deposited on its surface by electroplating or electrodeposition. This manufacturing method is also easy to manufacture for fine claw shapes that are difficult to plastically process by stamping.

[0037] Even with this manufacturing method, initial manufacturing costs can be suppressed because only one type of injection molding mold is needed.

[0038] Figure 8 This diagram shows the structure of the circuit board 14. A power supply circuit 15, a sensor 16, and a wireless communication circuit 17 are mounted on the circuit board 14. The power supply circuit 15 smooths the AC signal obtained from the generator G to generate DC, and then boosts or bucks it in a subsequent stage to generate a DC power supply GV for driving the sensor 16 and the wireless communication circuit 17. Since the frequency of the AC signal obtained from the generator G varies according to the rotation speed of the inner wheel 3, the AC signal can be processed in the rotation detection unit 20 to obtain the rotation signal RP.

[0039] For example, if the signal obtained by half-wave rectification of an AC signal using a diode is input to the base of a transistor, a rotational pulse signal corresponding to the rotational speed can be obtained, thus enabling the detection of the rotational speed. The rotation detection unit 20 can be such a transistor.

[0040] Sensor 16 is, for example, a temperature sensor or an acceleration sensor that monitors the condition of bearing B. Figure 1 In this circuit, sensor 16 is mounted on circuit board 14. However, in order to directly measure the temperature of bearing B, the temperature sensor can also be attached to the outer wheel 2 or fixed nearby, and the sensor signal can be input to circuit board 14.

[0041] The wireless communication circuit 17 includes an input section 17a for inputting sensor signals, an arithmetic section 17b for processing the sensor signals, a transceiver section 17c for transmitting and receiving data, and an antenna 17d. For example, if the sensor output is an analog voltage, the input section 17a may include a DA converter. In this configuration, by converting the sensor output into a digital signal near the sensor 16, the intrusion of electromagnetic noise can be suppressed.

[0042] In addition, the arithmetic unit 17b has CPU (Central Processing Unit) and storage functions, and performs arithmetic processing on the information obtained from the sensor 16.

[0043] The wireless communication circuit 17 is, for example, a module corresponding to wireless standards such as Bluetooth (registered trademark) or Bluetooth Low Energy (registered trademark). When the power generation is low, a circuit capable of driving the wireless communication circuit 17 with low power is preferred. The wireless communication circuit 17 can also be a communication circuit other than those listed above.

[0044] It is assumed that the presence of magnetic material near the antenna 17d would affect wireless communication. However, in this embodiment, since the circuit board 14 is fixed by a non-magnetic housing 13, the distance between the antenna 17d and magnetic materials such as the stator 9 can be increased, thus reducing the impact on wireless communication. Furthermore, if the stator 9 is not positioned on the back side of the wireless communication circuit 17, the impact on wireless communication can be further reduced.

[0045] The signal from sensor 16 can be processed into indicators corresponding to the purpose, such as the result of calculating the average value by the arithmetic unit 17b, the maximum and minimum values ​​within a certain period of time, and then transmitted. By processing the signal from sensor 16 by the arithmetic unit 17b, the amount of data transmitted can be reduced, the number of communication attempts can be decreased, and power consumption can be suppressed.

[0046] Figure 9 It means Figure 8 A diagram of an improved example of the circuit board 14 is shown. When using a generator G that utilizes the rotation of the inner wheel 3, if the inner wheel 3 does not rotate at a speed higher than a certain speed, the required power cannot be guaranteed. Therefore, in Figure 9 In addition to the generator G, a battery 21 is also installed. This configuration allows the generator G to switch to battery-powered operation via a switcher 19 when the generator G cannot guarantee the required power. Furthermore, the output of the generator G can be stored in the battery 21, and data can be transmitted intermittently while sufficient charge is stored.

[0047] Therefore, even when the inner wheel 3 is rotating at low speed or stopped, a signal from the sensor 16 can be sent, thus allowing the bearing B to be monitored at all times.

[0048] [Modification 1 of Implementation Method 1] Figure 10 This is a cross-sectional view at the plane of the rotating shaft of the bearing device 1A, which includes a variation of embodiment 1. The bearing device 1A is used as... Figure 1 An improved example of a bearing with a wireless sensor. Figure 10 In the middle, the shell 13 is configured to insert into the inner diameter portion of the magnetic ring 8, and the circuit board 14 is disposed inside it, therefore, with Figure 1 In comparison, it can reduce the axial width, making it more compact.

[0049] Figure 11 This is a diagram illustrating the conditions for fitting the recesses 10c and convexities 10d of the two magnetic ring members 10 together.

[0050] To simplify the diagram, the concave portion 10c is indicated by a white circular marker, and the convex portion 10d is indicated by a circular marker with a shaded line. Figure 11 (a) shows a view of the magnetic ring member 10-1 from the recess 10c and convex 10d sides, illustrating an example of forming one recess 10c and one convex 10d respectively. The recess 10c is formed at a position θ from the reference position, and the convex 10d is formed at a position φ from the recess 10c.

[0051] Figure 11 (b) is a diagram showing the configuration of the magnetic ring member 10-2. The configuration of the magnetic ring member 10-2 is equivalent to making it linearly symmetrical with respect to line O. Figure 11 (a) The configuration obtained by rotating to the right by an angle α. When bent with line O, the recess 10c provided in the magnetic ring member 10-1 and the protrusion 10d provided in the magnetic ring member 10-2 engage with each other, and the recess 10c provided in the magnetic ring member 10-2 and the protrusion 10d provided in the magnetic ring member 10-1 engage with each other.

[0052] In order for the concave portion 10c and the convex portion 10d to fit together, the following equation (1) needs to be satisfied. Figure 12 This is a diagram showing the phase of the two magnetic ring members 10 used to alternately engage the slot 10a and the claw 10b. Figure 12 (a) shows the configuration of the slots and claws of the magnetic ring member 10-1. Figure 12 (b) shows the configuration of the slots and claws of the magnetic ring member 10-1. Figure 12 The state shown in (b) is equivalent to the state from Figure 12 (a) is the state after rotating by angle α.

[0053] When the line O is bent, in order for the groove 10a and the claw 10b to alternately engage, the relationship shown in the following formula (2) needs to be satisfied. α=(i+1 / 2)·2π / n... (2) In the above, i represents the integer number of pitches offset during engagement, n represents the number of slots 10a and claws 10b of the magnetic ring member 10, and 2π / n represents the pitch P of the claws. Since the claws are staggered by 1 / 2 pitches in an alternating configuration, i is increased by 1 / 2 in Equation (2).

[0054] Since α in equation (1) and α in equation (2) are equal, if we solve these equations for i, we can obtain the following equation (3). That is, for the positions of the concave part 10c and the convex part 10d, φ can be chosen such that for the number n of the groove 10a and the claw 10b, the right side of equation (3) is an integer. For example, if we assume θ = π / 6, φ = π / 2, and n = 6, then i = 3.

[0055] Figure 13 This is a diagram of another example where the number n of slots 10a and claws 10b is set to an odd number. Figure 13 In the example shown, if we assume θ = π / 9, n = 9, φ = 5π / 9, then i = 5.

[0056] [Modification 2 of Implementation Method 1] In the above embodiment, an example is shown in which the outer wheel 2 of the bearing B is fixed to a stationary member, the inner wheel 3 is fixed to a rotating member, and the rotating member is supported relative to the stationary member. However, the present invention can also be applied to the case where the outer wheel rotates and the inner wheel is stationary.

[0057] Figure 14 This is a cross-sectional view at the plane of the rotating shaft of the bearing device 1B, which includes a variation of embodiment 1, 2. The bearing device 1B is... Figure 10 The bearing device 1A shown is a modified example, and is a bearing with a wireless sensor that rotates the outer wheel.

[0058] exist Figure 14 In this configuration, the magnetic ring 8 is fixed to the inner diameter portion of the outer ring 2, and a multipole magnet 8b is formed on the inner diameter side of the core 8a. The annular member 30 is fixed to the outer diameter surface of the inner wheel 3, which serves as a fixed wheel. The stator 9 is fixed to the outer diameter side of the annular member 30, and the housing 13 is fixed to the inner diameter side. Additionally, in... Figure 14 In the middle, the outer periphery of the stator 9 is opposite to the magnetic ring 8, so the claws arranged in a comb-like pattern are configured on the outer periphery of the stator 9.

[0059] The housing 13 has a flange 30a protruding outwards. A labyrinth structure is formed, narrowing the gap between the flange 30a and the magnetic ring 8. The labyrinth structure prevents the intrusion of foreign objects.

[0060] The circuit board 14 is fixed in a groove provided in the housing 13. The circuit board 14 is equipped with a power supply circuit 15 that rectifies and converts the alternating current generated by the generator G into direct current, a sensor 16 that monitors the state of the bearing B, and a wireless communication circuit 17 that wirelessly transmits the output of the sensor 16 to the outside. The starting end 12a and the ending end 12b of the winding, which are led out from the coil 12, are connected to the circuit board 14. When the outer wheel 2 rotates, the alternating current output from the generator G is converted into direct current by the power supply circuit 15. Furthermore, the cover 18 used to protect the circuit board 14 is made of a non-magnetic insulator such as resin and seals the opening of the housing 13. Alternatively, instead of the cover 18, the surface of the circuit board 14 can be sealed with a resin molding compound.

[0061] Even if the rotating wheel is outer wheel 2, as long as it is Figure 14 The structure shown can reduce the axial width, thus making it more compact.

[0062] [Implementation Method 2] In Embodiment 1, an example is shown of forming a magnetic ring by combining two magnetic ring components of the same shape. In Embodiment 2, another example is shown of forming a magnetic ring by similarly combining two magnetic ring components of the same shape. Regarding the parts other than the magnetic ring, since the structure is the same as that described in Embodiment 1, only the magnetic ring itself will be described below.

[0063] Figure 15 This is a side view of the magnetic ring member 10A used in Embodiment 2. Figure 16 This is observed from the XVI arrow. Figure 15 The diagram shows the magnetic ring component 10A.

[0064] Reference Figure 15 , Figure 16 At one end of the magnetic ring member 10A, grooves 10a and claws 10b, facing axial openings, are alternately arranged in a comb-like configuration. At the other end, multiple large-diameter portions 10g and small-diameter portions 10h with different outer diameters are formed. The number of large-diameter portions 10g is equal to the number of small-diameter portions 10h. A cutout 10j is provided at the boundary between the large-diameter portions 10g and the small-diameter portions 10h. Figure 15 An example is shown with two large-diameter sections 10g and two small-diameter sections 10h respectively.

[0065] Figure 17 This indicates the state in which two magnetic ring components 10A of the same shape are arranged opposite each other. Figure 18This indicates the state of two magnetic ring components 10A being fitted together.

[0066] If two magnetic ring members 10A-1 and 10A-2 of the same shape are positioned opposite each other with their claws 10b alternately arranged, then the large-diameter portion 10g of the magnetic ring member 10A-1 fits into the small-diameter portion 10h of the magnetic ring member 10A-2. Furthermore, the small-diameter portion 10h of the magnetic ring member 10A-1 fits into the large-diameter portion 10g of the magnetic ring member 10A-2.

[0067] When the two magnetic ring components 10A and 10A are fitted together, if the cutouts 10j are aligned, the claws 10b are arranged with a certain gap without contacting each other.

[0068] The hole 10e provided on the side of the magnetic ring member 10 is formed to lead the ends 12a and 12b of the coil 12 to the outside.

[0069] In reality, the winding tube 11 with the coil 12 wound around it is housed in the space between two magnetic ring members 10A-1 and 10A-2. However, to avoid complicating the diagram, the winding tube 11 with the coil 12 wound around it is omitted here.

[0070] In addition, the number of magnetized poles obtained by adding the N pole and S pole of magnetic ring 8 is equal to... Figure 18 The number of claws 10b in each state is the same.

[0071] Figure 19 In the plane containing the axis of rotation Figure 18 A cross-sectional view of the XIX section of the stator. Figure 20 In other planes containing the axis of rotation Figure 18 A cross-sectional view of the XX section of the stator. Additionally, the winding tube 11 and coil 12 are connected to... Figure 1 The same configuration is placed inside the stator, but in Figure 19 , Figure 20 The winding tube 11 and coil 12 shown in the diagram are omitted.

[0072] The claw 10b of magnetic ring member 10A-1 and the claw 10b of magnetic ring member 10A-2 are arranged on one side of coil 12. Figure 19 and Figure 20 Above the middle), and a cross-section on a certain plane ( Figure 20 In ), on the opposite side of one side of the coil ( Figure 20 (below the center), the first member 10A-1 and the second member 10A-2 overlap in the direction away from the coil, with the small diameter portion 10h of the first member 10A-1 and the large diameter portion 10g of the second member 10A-2 in that order. Furthermore, in other planes, the cross-sections ( Figure 19 In ), on the opposite side of one side of the coil ( Figure 19 (below the center), the first component 10A-1 and the second component 10A-2 overlap in the direction away from the coil, with the small diameter portion 10h of the second component 10A-2 and the large diameter portion 10g of the first component 10A-1 in that order.

[0073] In this way, the large diameter portion 10g of the magnetic ring member 10A-1 is fitted with the small diameter portion 10h of the magnetic ring member 10A-2, and the large diameter portion 10g of the magnetic ring member 10A-2 is fitted with the small diameter portion 10h of the magnetic ring member 10A-1, such that the claws 10b provided on the magnetic ring member 10A-1 and the claws 10b provided on the magnetic ring member 10A-2 are alternately arranged.

[0074] Since the large-diameter portion 10g and the small-diameter portion 10h abut on the cylindrical surface, the magnetic ring members 10A-1 and 10A-2 can be positioned to prevent circumferential displacement and reduce magnetic reluctance. Furthermore, since the large-diameter portion 10g and the small-diameter portion 10h are formed in equal numbers, if the cutout portions 10j are aligned, the large-diameter portion 10g and the small-diameter portion 10h will fit together, and the gap between the claws 10b of the magnetic ring member 10A-1 and the claws 10b of the magnetic ring member 10A-2 will be uniform. Therefore, when assembling the stator 9, phase matching of the magnetic ring members 10A-1 and 10A-2 is easily achieved.

[0075] Furthermore, by manufacturing the two magnetic ring components 10A-1 and 10A-2 into identical shapes, only one type of die is needed for stamping, thus reducing initial manufacturing costs. Additionally, no die changes are required during magnetic ring manufacturing, further reducing manufacturing costs.

[0076] Furthermore, by setting the large-diameter portion 10g and the small-diameter portion 10h and fitting them together, the contact area can be increased, the magnetic resistance can be reduced, and the gaps between each claw 10b can be uniformly configured, thus facilitating assembly.

[0077] When the magnetic ring component 10A is stamped, since the outer diameters of the two fitted magnetic ring components 10A-1 and 10A-2 are approximately the same, the difference in the outer diameter steps when they are fitted can be reduced, which facilitates the assembly operation of inserting the stator 9 into the outer ring 7.

[0078] [Implementation Method 3] The stator structure of the claw pole generator can be applied not only to bearings but also to outer wheel spacers. In Embodiment 3, an example of applying the stator structure of the claw pole generator to the outer wheel spacer of the main shaft assembly will be described.

[0079] Figure 21This is a cross-sectional view showing a simplified structure of the bearing assembly of a claw pole generator applied to a spindle assembly. Figure 22 yes Figure 21 An enlarged view of the main part on the left side. Figure 22 The main feature shown is the bearing assembly 90.

[0080] Figure 21 The spindle assembly 50 shown is used, for example, as a spindle assembly with an in-machine motor in a machine tool. In this case, a motor 52 is assembled into one end of the spindle 51, which is supported by the spindle assembly 50 for machine tool spindles, and a cutting tool such as an end mill (not shown) is connected to the other end.

[0081] Reference Figure 21 and Figure 22 The spindle assembly 50 includes bearings 53a and 53b, a spacer 54 disposed adjacent to the bearings 53a and 53b, a motor 52, and a bearing 55 disposed adjacent to the motor 52 on the opposite side of the spacer 54. The spindle 51 is supported by a plurality of bearings 53a and 53b provided in the housing 57 embedded in the inner diameter portion of the outer cylinder 56 in a freely rotatable manner.

[0082] Bearing 53a includes an inner wheel 53ia, an outer wheel 53ga, rolling elements Ta, and a retainer Rta. Bearing 53b includes an inner wheel 53ib, an outer wheel 53gb, rolling elements Tb, and a retainer Rtb. Spacer 54 includes an inner wheel spacer 54i and an outer wheel spacer 54g.

[0083] In addition, in order to enable wireless communication as described later, the rolling elements Ta and Tb are preferably ceramic balls that are non-metallic insulators, and the retainers Rta and Rtb are preferably made of resin.

[0084] The inner wheels 53ia and 53ib of bearing 53a and bearing 5b, which are axially separated, are fitted into the main shaft 51 in a tight-fitting (press-in) state. The inner wheel spacer 54i is disposed between the inner wheels 53ia and 53ib, and the outer wheel spacer 54g is disposed between the outer wheels 53ga and 53gb.

[0085] Bearings 53a and 53b are bearings capable of applying preload through axial force, and can be angular contact ball bearings, deep groove ball bearings, or tapered ball bearings, etc. Angular contact ball bearings are used as... Figure 22 The bearing assembly 90 is shown, and the two bearings 53a and 53b are configured as a back-side assembly (DB).

[0086] The outer wheel spacer 54g is axially divided into two parts, a first outer wheel spacer 54g1 and a second outer wheel spacer 54g2, between which the stator 9 of the generator G is fixed. Furthermore, a magnetic ring 8 is fixed to the outer circumferential surface of the inner wheel spacer 54i, and the stator 9 and the multipole magnet 8b of the magnetic ring 8 are arranged to face each other at a distance, thus constituting the generator G. As the generator G, it can be used... Figures 2-7 The claw-pole generators shown in Figures 15-20.

[0087] The magnetic ring 8 includes a core 8a and a multipole magnet 8b. The multipole magnet 8b is, for example, made by vulcanizing and bonding a magnetic material composed of magnetic powder and rubber to the core 8a, then alternately magnetizing the N and S poles, and fixing it to the inner wheel spacer 54i.

[0088] The stator 9 includes two magnetic ring members 10-1 and 10-2 of the same shape, a winding tube 11, and coils 12. A plurality of coils 12 are wound around the circumference of the winding tube 11. An example using the winding tube 11 is shown here, but the stator can be constructed similarly without using the winding tube 11, even with coils.

[0089] The groove 54g1a is formed on the end face of the first outer wheel spacer 54g1, and the circuit board 14 is mounted inside the groove 54g1a.

[0090] The circuit board 14 is equipped with a power supply circuit 15 that rectifies and converts the alternating current generated by the generator G into direct current, a sensor 16 that monitors the status of the bearing assembly 90, and a wireless communication circuit 17 that wirelessly transmits the output of the sensor 16 to the outside. The end 12a, which is the starting point of the winding of the coil 12, and the end 12b, which is the ending point of the winding, are connected to the circuit board 14 through a hole 54g1b. Here, the hole 54g1b is preferably sealed with a sealing material after wiring to prevent oil or the like from entering the circuit board 14. When the spindle 51 rotates, the alternating current output from the generator G is converted into direct current by the power supply circuit 15. Furthermore, a cover 18 for protecting the circuit board 14 is made of a non-metallic insulator such as resin and is fixed to the inside of the groove 54g1a. Alternatively, instead of the cover 18, the surface of the circuit board 14 can be sealed with a resin molding compound.

[0091] As sensor 16, multiple sensors such as temperature sensor, acceleration sensor, and load sensor are installed. For example, when a load sensor (not shown) is installed, the load sensor (not shown) is positioned between the first outer wheel spacer 54g1 and the second outer wheel spacer 54g2, and the signal is processed on the circuit board 14 and the output is transmitted wirelessly.

[0092] The single-row rolling bearing 55 is a cylindrical roller bearing. The radial and axial loads acting on the spindle assembly 50 are supported by bearings 53a and 53b, which are angular contact ball bearings. The radial load acting on the spindle assembly 50 for machine tool spindles is supported by the single-row bearing 55, which is a cylindrical roller bearing.

[0093] A cooling medium flow path GV is formed in the housing 57. By allowing the cooling medium to flow between the housing 57 and the outer cylinder 56, bearings 53a and 53b can be cooled.

[0094] When bearings 53a and 53b are lubricated with grease, no lubricating oil supply path is required. However, when lubrication with air oil or the like is required, a lubricating oil supply path is provided in the outer wheel spacer 54g. The lubricating oil supply path is not shown here.

[0095] During assembly, bearing 53a, spacer 54, bearing 53b, and spacer 58 are first inserted into the spindle 51 in sequence, and initial preload is provided by tightening nut 59. Then, the spindle 51 with bearings 53a and 53b installed is inserted into housing 57 until... Figure 22 The outer wheel 53gb of the bearing 53b in the middle abuts against the stepped portion 57a ​​provided on the housing 57. Finally, the outer wheel 53ga of the left bearing 53a is pressed by the front cover 60, thereby fixing the spindle 51 to the housing 57.

[0096] By tightening nut 59, force is applied to the end face of inner wheel 53ib of bearing 53b via spacer 58, and inner wheel 53ib is pressed against inner wheel spacer 54i. This force is transmitted to inner wheel 53ib, rolling element Tb, and outer wheel 53gb, applying preload between the track surfaces of inner wheel 53ib and outer wheel 53gb and rolling element Tb, and is transmitted from outer wheel 53gb to outer wheel spacer 54g.

[0097] This force is transmitted in bearing 53a to outer wheel 53ga, rolling element Ta, and inner wheel 53ia, and also applies preload between the track surfaces of inner wheel 53ia and outer wheel 53ga of left bearing 5a and the rolling element Ta. The preload supplied to bearings 53a and 53b is determined by the amount of movement limited by, for example, the dimensional difference between the width of outer wheel spacer 54g and the width of inner wheel spacer 54i.

[0098] In addition, for Figure 21 The single-row bearing 55 shown is axially positioned by a cylindrical member 61 fitted around the outer periphery of the main shaft 51 and an inner wheel clamping member 62. The inner wheel clamping member 62 is prevented from falling off by a nut 63 screwed onto the main shaft 51. The outer wheel 55b of the bearing 55 is clamped between positioning members 65 and 66 fixed to the end member 64. The inner wheel 55a slides integrally with respect to the end member 64 according to the extension and retraction of the main shaft 51.

[0099] The motor 52 for driving the main shaft 51 is positioned axially in the middle of the space 67 formed between the main shaft 51 and the outer cylinder 56, held by bearings 53b and single-row bearings 55. The rotor 68 of the motor 52 is fixed to the cylindrical member 61 fitted on the outer periphery of the main shaft 51, and the stator 69 of the motor 52 is fixed to the inner periphery of the outer cylinder 56.

[0100] Additionally, the flow path of the cooling medium used to cool the motor 52 is not shown here. A generator G, a sensor 16, and a wireless communication circuit 17 that wirelessly transmits the output of the sensor 16 to the outside are mounted on the outer wheel spacer 54g. This allows the generator to monitor the operating status of the spindle assembly 50 and wirelessly transmit the sensor output. Alternatively, an anomaly determination unit (not shown) that determines whether there is an anomaly based on the output of each sensor can be mounted on the circuit board 14, and the anomaly determination result can be wirelessly transmitted.

[0101] Radio waves transmitted from wireless communication circuit 17 pass between outer wheel 53ga and inner wheel 53ia of bearing 53a, and are emitted from the gap 70 of the labyrinth seal formed by main shaft 51 and front cover 60.

[0102] Because wireless communication is used, the spindle assembly 50 does not need to have wiring routed from the outer wheel spacer 54g. Therefore, there is no need to machine a slot for wiring on the inner diameter side of the housing 57, and modifications to the spindle assembly 50 can be kept to a minimum.

[0103] Figure 21 and Figure 22 The system also includes an outer wheel spacer 54g and an inner wheel spacer 54i. A magnetic ring 8 is fixed to the inner wheel spacer 54i, and a stator 9 is fixed to the outer wheel spacer 54g in a manner opposite to the magnetic ring 8. As a variation, although not shown, the magnetic ring 8 can be fixed to the outer wheel spacer 54g, and the stator 9 can be fixed to the inner wheel spacer 54i in a manner opposite to the magnetic ring 8. In this case, since the outer wheel rotates, the circuit board 14 is fixed to the inner wheel spacer 54i.

[0104] (Summarize) Finally, this embodiment will be summarized again with reference to the accompanying drawings.

[0105] Reference Figure 1The bearing assembly 1 includes a magnetic ring 8 fixed to a rotating component and a stator 9 fixed to a non-rotating component opposite to the magnetic ring 8. The magnetic ring 8 and the stator 9 constitute a claw-pole generator G. The stator 9 includes a coil 12 and a magnetic yoke surrounding the coil 12. The magnetic yoke is formed by a first component 10-1 and a second component 10-2 combining magnetic bodies. The first component 10-1 has a plurality of first claws 10b arranged in a comb-like pattern, and the second component 10-2 has a plurality of second claws 10b arranged in a comb-like pattern. The plurality of first claws 10b of the first component 10-1 and the plurality of second claws 10b of the second component 10-2 are alternately arranged on the surface opposite to the magnetic ring 8. The first component 10-1 and the second component 10-2 have the same shape.

[0106] Preferably, the bearing assembly 1 further includes an outer wheel 2, an inner wheel 3, and a plurality of rolling elements 4 disposed between the outer wheel 2 and the inner wheel 3. A magnetic ring 8 is fixed to one of the outer wheel 2 and the inner wheel 3. A stator 9 is fixed to the other of the outer wheel 2 and the inner wheel 3 in a manner opposite to the magnetic ring 8.

[0107] Preferably, Figure 21 and Figure 22 The bearing assembly 90 shown also includes an outer wheel spacer 54g and an inner wheel spacer 54i. A magnetic ring 8 is fixed to the inner wheel spacer 54i, and a stator 9 is fixed to the outer wheel spacer 54g in a manner opposite to the magnetic ring 8. Although not shown, the magnetic ring 8 can be fixed to the outer wheel spacer 54g, and the stator 9 can be fixed to the inner wheel spacer 54i in a manner opposite to the magnetic ring 8.

[0108] Furthermore, by making the two magnetic ring components 10-1 and 10-2 identical in shape, only one type of die is needed for stamping, thus reducing initial manufacturing costs. Additionally, no die changes are required during the manufacturing of the magnetic ring components, further reducing manufacturing costs.

[0109] The stator 9 and magnetic ring 8 have an annular shape through which the shaft of the bearing assembly 1 passes. Figure 1 , Figure 10 , Figure 14 In the cross section of the stator 9 on the plane containing the rotating shaft, the first claw 10b and the second claw 10b are arranged on one side of the coil 12, and the end face 10f of the first member 10-1 and the end face 10f of the second member 10-2 abut against the opposite side of the coil 12 in the cross section.

[0110] A first recess 10c and a first protrusion 10d are formed on the end face 10f of the first member 10-1, and a second recess 10c and a second protrusion 10d are formed on the end face of the second member. In the cross-section, as shown... Figure 6 , Figure 7As shown, on the opposite side of one side of coil 12, the first recess 10c abuts against the second protrusion 10d, and the first protrusion 10d abuts against the second recess 10c. Furthermore, by... Figure 2 The coil 12 shown is surrounded by the first component 10-1 and the second component 10-2. Figure 7 Illustrations omitted.

[0111] Therefore, by setting the concave portion 10c and the convex portion 10d, it is easy to make the phase of the two magnetic rings match during assembly.

[0112] like Figure 11 As shown, the first member 10-1 and the second member 10-2 are configured to satisfy α = 2π - 2θ - φ. Here, α represents the rotation angle between the first member 10-1 and the second member 10-2, θ represents the angle indicating the position of the first recess 10c starting from the reference position, and φ represents the angle indicating the position of the first protrusion 10d starting from the position of the first recess 10c.

[0113] Component 10-1 and Component 20-2 are configured to satisfy α = (i + 1 / 2)·2π / n. Here, α represents the rotation angle between Component 10-1 and Component 20-2. i represents an integer. n represents the number of the plurality of first claws 10b of Component 10-1 and the plurality of second claws 10b of Component 20-2. 2π / n represents the pitch P of each of the plurality of first claws 10b of Component 10-1 and the plurality of second claws 10b of Component 20-2. For example, Figure 12 An example is shown where n=6 and i=3.

[0114] The stator 9 and magnetic ring 8 have an annular shape through which the shaft of the bearing assembly 1 passes. In the cross-section of the stator on the first and second planes containing the shaft, as shown... Figure 19 , Figure 20 As shown, one of the first claw 10b of the first component 10A-1 and the second claw 10b of the second component 10A-2 is configured on one side of the coil 12. Figure 19 , Figure 20 Above the middle), in the section of the first plane ( Figure 20 In ), on the opposite side relative to one side of the coil ( Figure 20 (below the center), the first component 10A-1 and the second component 10A-2 overlap in the order of first component 10A-1, second component 10A-2, moving away from the coil. The cross-section on the second plane ( Figure 19 In the coil, on the opposite side of the coil, the first component 10A-1 and the second component 10A-2 overlap in the order of the second component 10A-2 and the first component 10A-1, moving away from the coil.

[0115] Therefore, since the first member 10A-1 and the second member 10A-2 overlap on the opposite side of the claw 10b, the contact area can be increased and the magnetic resistance of the yoke can be reduced.

[0116] The manufacturing method for any of the above bearing devices or spacers includes: a step of punching the first component 10-1 and the second component 10-2 by stamping using a mold of the same shape, and a step of assembling the first component 10-1, the second component 10-2 and the coil 12 to form the stator 9.

[0117] Furthermore, by making the two magnetic ring components 10-1 and 10-2 identical in shape, only one type of die is needed for stamping, thus reducing initial manufacturing costs. Additionally, no die changes are required during the manufacturing of the magnetic ring components, further reducing manufacturing costs.

[0118] All descriptions of the embodiments disclosed herein should be considered illustrative rather than limiting. The scope of the invention should be understood not by the above description of the embodiments, but by the claims, and includes all variations within the same meaning and scope as the claims. Label Explanation

[0119] 1. 1A, 1B, 90 bearing assembly; 2. 53ga, 53gb, 55b outer wheels; 3. 53ia, 53ib, 55a inner wheels; 4. Ta, Tb rolling elements; 5. Rta, Rtb retainers; 5a, 5b, 53a, 53b, 55, B bearings; 6. Seals; 7. Outer ring; 8. Magnetic ring; 8a core; 8b multipole magnet; 9. 69 stator; 10. 10-1, 10-2, 10A, 10A-1, 10A-2 magnetic ring components; 10a groove; 10b claw; 10c recess; 10d protrusion; 10e hole; 10f end face; 10g large diameter section; 10h small diameter section; 10j cut section; 11 winding tube; 12 coil; 12 a, 12b end, 13 housing, 14 circuit board, 15 power supply circuit, 16 sensor, 17 wireless communication circuit, 17a input section, 17b arithmetic section, 17c transceiver section, 17d antenna, 18 cover, 19 switcher, 20 rotation detection section, 21 battery, 30 ring member, 30a flange section, 50 spindle assembly, 51 spindle, 52 motor, 54, 58 spacers, 54g1a groove, 54g1b hole, 54g1 first outer wheel spacer, 54g2 second outer wheel spacer, 54g outer wheel spacer, 54i inner wheel spacer, 56 outer cylinder, 57 housing, 57a step section, 59, 63 nuts, 60 front cover, G generator, GV DC power supply.

Claims

1. A bearing device for rotatably supporting a rotating component, characterized in that, include: A magnetic ring fixed to the rotating component; as well as The stator of the non-rotating component is fixed in a manner opposite to the magnetic ring. The magnetic ring and the stator constitute a claw-pole generator. The stator comprises: coil; and The magnetic yoke surrounding the coil, The magnetic yoke is constructed by combining a first component and a second component of a magnetic body. The first component has a plurality of first claws arranged in a comb-like pattern. The second component has a plurality of second claws arranged in a comb-like pattern. The plurality of first claws and the plurality of second claws are alternately arranged on the surface opposite to the magnetic ring. The first component and the second component have the same shape. The stator and the magnetic ring have an annular shape through which the rotating shaft of the bearing assembly passes. In a cross-section of the stator on the first and second planes containing the rotating shaft, one of the plurality of first claws and the plurality of second claws is disposed on one side of the coil. In a cross-section on the first plane, on the opposite side of the coil, the first member and the second member overlap in the order of the first member and the second member, moving away from the coil. In the cross-section on the second plane, on the opposite side of the coil, the first member and the second member overlap in the order of the second member and the first member, moving away from the coil.

2. The bearing device as described in claim 1, characterized in that, Also includes: Foreign vessels; Inner wheel; as well as Multiple rolling elements configured between the outer wheel and the inner wheel, The magnetic ring is fixed to one of the outer wheel and the inner wheel. The stator is fixed to one of the outer wheel and the inner wheel in a manner opposite to the magnetic ring.

3. The bearing device as described in claim 1, characterized in that, Also includes: Outer wheel spacer; as well as Inner wheel spacer, among which The magnetic ring is fixed to one of the outer wheel spacer and the inner wheel spacer. The stator is fixed to one of the outer wheel spacer and the inner wheel spacer in a manner opposite to the magnetic ring.

4. A method for manufacturing a bearing assembly, used to manufacture the bearing assembly as described in any one of claims 1 to 3, characterized in that, include: The process of punching the first component and the second component using a mold of the same shape through stamping; as well as The process of assembling the first component, the second component, and the coil to form the stator.

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