Brake mechanism and rotation system

Abstract

To provide a brake mechanism capable of radiating heat of a rotation mechanism with high efficiency.SOLUTION: A brake mechanism includes a stator which is provided in a direction of a distal end side of a rotation shaft of a rotation mechanism and has an electromagnet, a rotator which is attached to the rotation shaft at a position between the rotation mechanism and the stator and has a flow passage of gas formed in a direction inclined with respect to an axial direction of the rotation shaft, and a control unit which presses the rotator and releases the pressing by moving forward and backward in the axial direction of the rotation shaft in accordance with an energization state of the electromagnet.SELECTED DRAWING: Figure 3A

Description

[Technical field]

[0001] The present invention relates to a brake mechanism and a rotation system. [Background technology]

[0002] 2. Description of the Related Art Conventionally, there have been known mechanisms for dissipating heat generated when a rotating mechanism, such as a prime mover in a rotating system, rotates.

[0003] In this regard, Patent Document 1 discloses a configuration in which a rotor provided inside a prime mover has a rotating shaft, a fan fixedly connected to the outer periphery of the rotating shaft, and a magnetic body connected to the outer periphery of the fan, and the prime mover dissipates heat by an airflow generated inside the prime mover in response to rotation of the rotor. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2007-300763 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, the technology described in Patent Document 1 requires changing the configuration of the prime mover itself, which increases costs because the existing prime mover cannot be used. Also, the technology described in Patent Document 1 does not assume the provision of a brake mechanism for braking the rotation of a rotating mechanism such as a prime mover, and therefore has the problem that if a brake mechanism is provided, the rotating mechanism cannot efficiently dissipate heat.

[0006] The present invention has been made in consideration of such problems, and has an object to provide a brake mechanism and a rotation system that can dissipate heat from the rotation mechanism with high efficiency. [Means for solving the problem]

[0007] In order to solve the above problems, the brake mechanism of the present invention comprises a stator having an electromagnet and provided toward the tip side of a rotating shaft of a rotating mechanism, a rotor attached to the rotating shaft at a position between the rotating mechanism and the stator and having a gas flow path formed in a direction inclined with respect to the axial direction of the rotating shaft, and a braking unit that presses and releases the pressure on the rotor by moving forward and backward in the axial direction of the rotating shaft depending on the current flow state of the electromagnet.

[0008] The flow passage is at least one hole formed in the surface facing the stator so as to extend in an inclined direction.

[0009] In addition, the rotor has an annular plate portion formed in a ring shape and provided on the outer periphery of the surface facing the stator, and the braking portion applies pressure to the rotor by pressing the annular plate portion, and the flow path has an opening on the surface facing the stator provided inside the annular plate portion.

[0010] The flow passages are provided in a plurality of locations such that the openings are arranged in a circular shape on the surface facing the stator.

[0011] The rotation system of the present invention also includes a rotation mechanism that rotates along a rotation axis, a stator having an electromagnet provided at the tip side of the rotation axis, a rotor that is attached to the rotation axis at a position between the rotation mechanism and the stator and has a gas flow path formed in a direction inclined with respect to the axial direction of the rotation axis, and a brake mechanism having a braking part that presses or releases the pressure on the rotor by moving back and forth in the axial direction of the rotation axis depending on the current flow state of the electromagnet. Effect of the Invention

[0012] According to the present invention, the brake mechanism and the rotation system can dissipate heat from the rotation mechanism with high efficiency. [Brief description of the drawings]

[0013] [Figure 1]1 is a diagram showing an overall configuration of a rotation system according to an embodiment of the present invention; [Figure 2A] 5A and 5B are diagrams illustrating the brake mechanism in a locked state according to the embodiment. [Figure 2B] FIG. 4 is a diagram showing the brake mechanism in a released state according to the embodiment. [Figure 3A] FIG. 2 is a perspective view of a rotor according to the embodiment. [Figure 3B] FIG. 2 is a front view of the rotor according to the embodiment. [Figure 3C] 3C is a cross-sectional view taken along line II of the rotor shown in FIG. 3B. [Figure 3D] FIG. 2 is a rear view of the rotor according to the embodiment. [Figure 4] FIG. 13 is a perspective view showing another example of the configuration of the brake mechanism. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an embodiment of the present invention (hereinafter, referred to as "the present embodiment") will be described with reference to the accompanying drawings. In order to facilitate understanding of the description, the same components and steps in each drawing are denoted by the same reference numerals as much as possible, and duplicated descriptions will be omitted.

[0015] Fig. 1 is a diagram showing the overall configuration of a rotation system 1 according to this embodiment. As shown in Fig. 1, the rotation system 1 rotates or stops the rotation of a rotating shaft 11 in accordance with a control command from a control device (not shown). The main part of the rotation system 1 includes, for example, a rotation mechanism 10, a brake mechanism 20, and a measurement mechanism 30.

[0016] The rotating mechanism 10 is, for example, an electric motor such as a brushless motor or a servo motor, or a generator such as a DC generator or an AC generator. The rotating mechanism 10 rotates a rotating shaft 11 provided along an imaginary line O passing through the center along the penetrating direction in accordance with a control command from a control device (not shown), and transmits the rotation to the brake mechanism 20 via the rotating shaft 11. The rotating mechanism 10 also stops the rotation of the rotating shaft 11 in accordance with a control command from the control device (not shown), and transmits the stop of the rotation to the brake mechanism 20 via the rotating shaft 11.

[0017] The brake mechanism 20 is, for example, a non-excitation actuated brake, and brakes the rotation of the rotating shaft 11 in accordance with a control command from a control device (not shown). The brake mechanism 20 is provided between the rotating mechanism 10 and the measuring mechanism 30, and is connected to the rotating mechanism 10 via the rotating shaft 11.

[0018] The measurement mechanism 30 is, for example, an optical encoder, which measures the rotation angle of the rotating shaft 11 along the imaginary line O and transmits the measurement result to a control device (not shown). The measurement mechanism 30 is provided near the brake mechanism 20 on the opposite side to the rotating mechanism 10 such that the measurement surface faces the tip of the rotating shaft 11.

[0019] The structure of the brake mechanism 20 will be described in detail with reference to Figures 2A and 2B. Figure 2A is a diagram showing the brake mechanism 20 in a locked state. Figure 2B is a diagram showing the brake mechanism 20 in a released state. As shown in Figures 2A and 2B, the brake mechanism 20 includes, for example, a rotor 21, an annular plate portion 23, a stator 25, and a braking portion 28.

[0020] The rotor 21 is, for example, a brake rotor, and is attached to the rotating shaft 11 at a position between the rotating mechanism 10 and the stator 25, and rotates in conjunction with the rotating shaft 11. With reference to FIG. 3A, the rotor 21 is configured to include, for example, a hub portion 211 and a flange portion 212.

[0021] Hub portion 211 is provided at the center of rotor 21 and is rotatable along imaginary line O in response to a force transmitted from rotating shaft 11 connected to the inner periphery. Hub portion 211 is formed in a cylindrical or polygonal tubular shape, and a flange portion 212 is connected to the outer periphery.

[0022] The flange portion 212 is formed in a ring shape, and its inner circumference is connected to the outer circumference of the hub portion 211. Furthermore, the flange portion 212 has an annular plate portion 23 provided on its outer circumference on the surface A1 on the stator 25 side. Furthermore, the flange portion 212 has a gas flow passage 213 that penetrates from the surface A1 to the surface A2 on the rotation mechanism 10 side, inside the location on the surface A1 where the annular plate portion 23 is provided.

[0023] 2A and 2B, the annular plate portion 23 is a member formed in an annular shape so as to come into contact with the braking portion 28 when the braking portion 28 presses against the rotor 21, and is provided on the outer periphery on surface A1 to transmit the pressing force of the braking portion 28 to the rotor 21. The annular plate portion 23 is formed from a material and with a shape such that the coefficient of friction between the surface of the annular plate portion 23 on the stator 25 side and the surface of the braking portion 28 on the rotor 21 side is greater than the coefficient of friction between surface A1 and the surface of the braking portion 28 on the rotor 21 side.

[0024] Stator 25 is, for example, a brake stator, and generates a magnetic field for operating braking unit 28 in accordance with a control command transmitted from a control device (not shown). Stator 25 is provided in brake mechanism 20 in a direction from rotor 21 to the tip side of rotating shaft 11. A main portion of stator 25 includes, for example, a stator 251 having an electromagnet 252.

[0025] Stator 251 is formed in a cylindrical shape with the imaginary line O as the central axis, and electromagnet 252 is embedded so as to be exposed on the surface on the rotor 21 side or in the vicinity of the surface on the rotor 21 side. Stator 251 transmits signals including control commands transmitted from a control device (not shown) to electromagnet 252.

[0026] The electromagnet 252 is, for example, a coil, and is provided in the stator 251. The electromagnet 252 is excited in accordance with the voltage of a signal supplied from a control device (not shown) via the stator 251 to generate a magnetic field in accordance with the voltage, thereby entering a magnetic force generating state, and on the other hand, stops generating the magnetic field in accordance with the halt of the supply of the voltage of the signal, thereby entering a magnetic force non-generating state. The electromagnet 252 attracts the armature 281 of the braking unit 28 to the electromagnet 252 by generating a magnetic field.

[0027] Braking unit 28 is provided between rotor 21 and stator 25, and presses and releases pressure on rotor 21 by advancing and retreating along imaginary line O which is the axial direction of rotating shaft 11 according to the electrified state of electromagnet 252. Specifically, braking unit 28 presses annular plate portion 23 toward rotation mechanism 10 to press rotor 21. Braking unit 28 includes, for example, elastic body 282 and armature 281.

[0028] Armature 281 is formed including a thin cylindrical magnetic body, and is provided between annular plate portion 23 and stator 251 so that the central axis coincides with imaginary line O, and is further connected to the other end of elastic body 282. When electromagnet 252 is not generating a magnetic field (magnetic force non-generating state), armature 281 comes into contact with annular plate portion 23 by the elasticity of elastic body 282 and presses rotor 21 toward rotation mechanism 10, thereby fixing rotor 21 so as not to rotate (locked state), and is in a non-attached state where it is not attracted to electromagnet 252, as shown in FIG.

[0029] In contrast, as shown in FIG. 2B, when the electromagnet 252 is generating a magnetic field (magnetic force generating state), the armature 281 is attracted by the magnetic field of the electromagnet 252 and moves away from the annular plate portion 23, and is attracted to the surface of the electromagnet 252 or the stator 251 facing the rotor 21, and is in an attracted state to the electromagnet 252, thereby releasing the pressure on the rotor 21 (releasing the state).

[0030] Elastic body 282 is, for example, a metal spring, one end of which is connected to stator 251 and the other end of which is connected to armature 281. Elastic body 282 uses its elasticity to press armature 281 toward rotor 21. Elastic body 282 has an inherent elastic coefficient such that the force with which elastic body 282 presses armature 281 toward rotor 21 is weaker than the force with which the magnetic field generated by electromagnet 252 attracts armature 281 to electromagnet 252.

[0031] Next, the structure of rotor 21 will be described in detail. Fig. 3A is a perspective view of rotor 21 according to this embodiment. Fig. 3B is a front view of rotor 21 according to this embodiment. Fig. 3C is a cross-sectional view taken along line II of rotor 21 shown in Fig. 3B. Fig. 3D is a rear view of rotor 21 according to this embodiment.

[0032] 3A to 3D, the rotor 21 is provided with a flow passage 213 penetrating between the surface A2 and the surface A1 in the flange portion 212. The flow passage 213 is at least one or more holes formed so as to extend in a spiral shape centered on the rotation shaft 11. For example, a plurality of the flow passages 213 are provided in the flange portion 212 so that the arrangement of the openings is annular on the surface A2, and the flow passages 213 are formed so as to be inclined with respect to the imaginary line O which is the axial direction of the rotation shaft 11. The inclined direction means, for example, a direction in a "twisted position" that is neither parallel nor perpendicular to the imaginary line O which is the axial direction.

[0033] Specifically, the flow passage 213 is formed so as to extend in a direction inclined to the tangential direction of a concentric circle having the virtual line O as the central axis when viewed from the virtual line O, which is the axial direction, or so as to have a cross-sectional shape asymmetrical with respect to the radial direction of the concentric circle. In this embodiment, the flow passage 213 is a hole penetrating from the face A2 to the face A1, and is formed so as to have an opening in the shape of a rounded rectangle or an oval. Furthermore, the flow passage 213 is formed so that the long side of the opening on the face A2 side is longer than the long side of the opening on the face A1, and one of the inner walls on the short side is inclined with respect to the virtual line O. Note that one of the inner walls on the short side is an inner wall on the counterclockwise side with the virtual line O as the rotation axis when the rotor 21 is viewed from the face A2 side.

[0034] When rotor 21 configured as described above rotates clockwise along virtual line O as viewed from the front side in accordance with the rotation transmitted from rotating shaft 11, the inclination formed in flow path 213 pushes air near rotor 21 toward rotation mechanism 10. By pushing air toward rotation mechanism 10, rotor 21 generates air convection between rotation mechanism 10 and brake mechanism 20.

[0035] Note that, when rotor 21 is viewed from surface A2, flow path 213 may have an inner wall on the clockwise side with imaginary line O as the rotation axis inclined with respect to imaginary line O. In this case, when rotor 21 rotates counterclockwise along imaginary line O as viewed from the front side in accordance with the rotation transmitted from rotation shaft 11, the inclination formed in flow path 213 pushes air near rotor 21 toward rotation mechanism 10.

[0036] <Effects> As described above, in this embodiment, the brake mechanism 20 is provided toward the tip side of the rotating shaft 11 of the rotating mechanism 10 and includes a stator 25 having an electromagnet 252, a rotor 21 attached to the rotating shaft 11 at a position between the rotating mechanism 10 and the stator 25 and having a gas flow path 213 formed in a direction inclined relative to the axial direction of the rotating shaft 11, and a braking unit 28 that presses and releases the pressure on the rotor 21 by moving forward and backward in the axial direction of the rotating shaft 11 depending on the electrified state of the electromagnet 252. As a result, in the brake mechanism 20, because the gas flow path 213 is formed in the rotor 21, the rotation of the rotor 21 generates gas convection in the rotation mechanism 10, dissipating heat from the rotation mechanism 10. Therefore, the brake mechanism 20 can dissipate heat from the rotation mechanism 10 with high efficiency.

[0037] In this embodiment, the flow passage 213 is at least one hole formed in the surface A1 on the stator 25 side so as to extend in a direction inclined toward the axial direction of the rotating shaft 11. As a result, the brake mechanism 20 is formed such that the flow passage 213 extends in a direction inclined to the axial direction of the rotating shaft 11, so that the heat of the rotating mechanism 10 can be dissipated with higher efficiency.

[0038] In this embodiment, the rotor 21 has an annular plate portion 23 formed in an annular shape provided on the outer periphery on the surface A1 on the stator 25 side. The brake portion 28 applies the pressure to the rotor 21 by pressing the annular plate portion 23. The flow passage 213 has an opening on the surface A1 on the stator 25 side provided inside the annular plate portion 23. As a result, the brake mechanism 20 has a flow path 213 formed inside the annular plate portion 23 that contacts the braking portion 28, so that the rotation mechanism 10 can dissipate heat with high efficiency without impairing the braking action caused by the braking portion 28 pressing against the rotor 21.

[0039] In this embodiment, the flow paths 213 are provided in a plurality of locations such that the openings are arranged in a ring shape on the surface A1 on the stator 25 side. As a result, since the brake mechanism 20 has a plurality of flow paths 213 provided in the rotor 21, the brake mechanism 20 can dissipate heat from the rotation mechanism 10 with higher efficiency.

[0040] <Modification> The present invention is not limited to the above-described embodiment. In other words, the above-described embodiment may be modified by a person skilled in the art as appropriate, and the modifications may be included within the scope of the present invention as long as they include the characteristics of the present invention. In addition, the elements of the above-described embodiment and the modifications described below may be combined to the extent technically possible, and the combinations of these may be included within the scope of the present invention as long as they include the characteristics of the present invention.

[0041] For example, in this embodiment, the flow paths 213 are provided such that the openings are arranged in a ring shape on the surface A1 on the stator 25 side, but this is not limited to this. Here, another example of the configuration of the brake mechanism 20 will be described with reference to Fig. 4. Fig. 4 is a diagram showing another example of the configuration of the brake mechanism 20.

[0042] As shown in FIG. 4, the brake mechanism 200 includes, for example, a stator 25, a braking unit 28, and a rotor 210. The stator 25 and the braking unit 28 are as described above, and therefore will not be described here. The rotor 210 has, for example, a flow path 215 formed in a ring shape surrounding a virtual line O on the surface A1, and the periphery of the flow path 215 is formed to have a plurality of recesses when viewed from the surface A1 side. In addition, the plurality of recesses formed on the periphery of the flow path 215 are formed such that one inner wall is inclined with respect to the virtual line O, which is the axial direction of the rotating shaft 11. Here, the one inner wall is, for example, an inner wall on the counterclockwise side with the virtual line O as the rotation axis when the rotor 210 is viewed from the surface A2 side.

[0043] According to this configuration, in the brake mechanism 200, the flow passage 215 of the rotor 210 is formed in a ring shape by one hole having a plurality of recesses, so that a large space for gas convection is secured. Therefore, the brake mechanism 200 can dissipate heat from the rotation mechanism 10 with higher efficiency.

[0044] In the present embodiment, the direction of the flow passage 213 is a direction inclined with respect to the virtual line O, which is the axial direction, but is not limited thereto. The direction of the flow passage 213 may be constant regardless of the position, or may change continuously or discontinuously depending on the position. Accordingly, the rotor 21 may be provided in the flange portion 212 with both a flow passage 213 whose inner wall is inclined on the counterclockwise side with the virtual line O as the rotation axis when the rotor 21 is viewed from the surface A2 side, and a flow passage 213 whose inner wall is inclined on the clockwise side with the virtual line O as the rotation axis when the rotor 21 is viewed from the surface A2 side.

[0045] According to this configuration, the brake mechanism 20 has both a flow path 213 that is positioned on the clockwise side when the virtual line O of the inner wall, which is inclined relative to the virtual line O, is taken as the rotation axis, and a flow path 213 that is positioned on the counterclockwise side, provided in the flange portion 212.Therefore, the rotation mechanism 10 can dissipate heat with high efficiency regardless of whether the rotor 21 rotates clockwise or counterclockwise when viewed from the surface A2 side. [Explanation of symbols]

[0046] 10...rotation mechanism, 11...rotation shaft, 20...brake mechanism, 21...rotor, 25...stator, 28...braking portion, 213...flow path, 252...electromagnet

Claims

1. a stator provided toward a tip end side of a rotation shaft of the rotation mechanism and having an electromagnet; a rotor attached to the rotating shaft at a position between the rotating mechanism and the stator, the rotor having a gas flow path formed in a direction inclined with respect to an axial direction of the rotating shaft; a braking unit that performs pressing against the rotor and releasing the pressing by moving forward and backward in the axial direction of the rotating shaft according to a current-carrying state of the electromagnet; A brake mechanism comprising:

2. The flow path is at least one hole formed in the surface of the stator side so as to extend in the inclined direction.

2. The brake mechanism according to claim 1.

3. The rotor has an annular plate portion formed in an annular shape and provided on an outer periphery of a surface on the stator side, the braking portion applies the pressure against the rotor by pressing the annular plate portion, The flow path has an opening on the surface facing the stator, the opening being provided inside the annular plate portion.

3. The brake mechanism according to claim 2.

4. The flow paths are provided in a plurality of locations such that the openings are arranged in an annular shape on the surface of the stator side. A brake mechanism according to any one of claims 1 to 3.

5. A rotation mechanism that rotates along a rotation axis; a stator provided toward the tip end of the rotating shaft and having an electromagnet; a rotor attached to the rotating shaft at a position between the rotating mechanism and the stator, the rotor having a gas flow path formed in a direction inclined with respect to the axial direction of the rotating shaft; and a brake mechanism having a braking part that presses or releases the rotor by advancing and retreating in the axial direction of the rotating shaft depending on the current-carrying state of the electromagnet; A rotation system comprising:

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