JP2011190918A - Brake device and rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To sufficiently prevent wear and heating from occurring when a brake is applied and released. <P>SOLUTION: This electromagnetic brake device 100 includes: a hub 21 attached to the motor shaft 3 of a rotating electric machine 1; a brake disk 33 which is engaged with the hub 21 so as to be rotatingly driven and to be moved in the axial direction and which is brought into contact with a side plate 31 by moving to the axial one side when a brake is applied, and released from the contact thereof on the side plate 31 by moving to the axial other side when the brake is released; springs 25 and an exciting coil 23 which do not provide, to the brake disk 33, a drive force for moving the brake disk to the axial one side when the brake is released and which provides, to the brake disk 33, a drive force for moving the brake disk to the axial one side when the brake is applied; and a projection 21c for restraining the amount of the movement of the brake disk 33 to the axial other side. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a brake device that is, for example, a non-excitation operation type electromagnetic brake, and a rotating electrical machine including the same.

  For example, a non-excitation operation type electromagnetic brake device is conventionally known (see, for example, Patent Document 1). In this prior art, the rotating shaft of the rotating electrical machine is arranged in the vertical direction, and the brake disk is attached to the rotating shaft so as to be movable in the axial direction (vertical direction). At the time of braking, the armature is pushed upward by the urging force of the spring provided on the field core located below the brake disc, whereby the brake disc located above the armature moves upward and contacts the side plate, Braking is performed. When the brake is released, the electromagnetic attractive force from the field core exciting coil overcomes the spring biasing force and lowers the armature, thereby lowering the brake disk and separating it from the side plate.

Japanese Patent Laying-Open No. 2008-121836 (paragraphs 0016 to 0026, FIG. 1)

  In the above prior art, when the brake is released, the lower surface of the lowered brake disc is pressed against the armature by its own weight, and rotates while sliding with the armature. In order to alleviate this, a sliding target material made of a material having a small friction coefficient is provided on the lower surface of the brake disk. However, even if a material having a small friction coefficient is used, friction itself is unavoidable, and it has been difficult to sufficiently prevent the generation of wear and heat generation.

  The objective of this invention is providing the brake device which can fully prevent the abrasion and heat_generation | fever at the time of brake releasing, and a rotary electric machine provided with the same.

  In order to achieve the above object, a brake device according to the present invention is engaged with a torque transmission member attached to a rotation shaft of a braked device, a torque transmission member capable of rotation transmission and movement in an axial direction, The disk-shaped member that moves to one side in the axial direction during braking and contacts the fixed-side member, and that can move to the other side in the axial direction when the brake is released, and the disk-shaped member when the brake is released. A driving means capable of applying a driving force for moving in the one axial direction to the disk-like member during the braking without applying a driving force for moving in the one axial direction; and the disk Restricting means for restricting the amount of movement of the member in the other axial direction.

  The brake device of the present invention includes a torque transmission member attached to the rotating shaft of the braked device. The torque transmitting member is provided with a disk-shaped member that can move in the axial direction while transmitting rotation, and the rotating shaft of the braked device is braked using the disk-shaped member. That is, at the time of braking, the disk-shaped member moves to the one side in the axial direction by the driving force from the driving means and contacts the fixed side member. As a result of the contact, the frictional force of the fixed side member acts on the disk-shaped member, so that the rotation of the disk-shaped member is braked. As a result, the rotation shaft of the driven device that is engaged with the disk-like member so as to be able to transmit the rotation is stationary. On the other hand, when the brake is released, the driving force is not applied by the driving means, and the disk-like member can move to the other side in the axial direction.

  At this time, the amount of movement of the disk-shaped member toward the other side in the axial direction is restricted by the restriction means. Thus, in the present invention, even when the application of the driving force to the one side in the axial direction by the driving means disappears, the movement of the disk-shaped member to the other side in the axial direction is not completely free and constant. Regulations are made. For example, when it is used with one side in the axial direction on the upper side and the other side in the axial direction on the lower side, the disc-shaped member is separated from the fixed side member by its own weight when the contact with the fixed side member is eliminated. To prevent the disc-shaped member separated as described above from moving to the other side in the axial direction toward the other member on the opposite side to the stationary member and coming into contact with the other member. Can do. As a result, the disc-shaped member that is separated from the fixed-side member at the time of braking release can be maintained in a state of being separated from other members on the opposite side of the fixed-side member. Can be prevented.

  Preferably, the restricting means includes a contact member provided on the torque transmission member and capable of contacting the disk-shaped member movable in the axial direction from the other side in the axial direction.

  Thereby, when the braking force is released, the application of the driving force by the driving means disappears, and even if the disk-shaped member moves away from the fixed-side member and moves to the other side in the axial direction, the contact member moves from the other side in the axial direction to the disk-shaped member. Can be prevented from further movement. As a result, it is possible to reliably prevent the disk-shaped member from contacting the other member.

  Further preferably, the driving means is excited when the brake is released, and an elastic member for applying an urging force to the disk-shaped member toward the one side in the axial direction, and the axial direction is applied to the disk-shaped member. An exciting coil capable of applying a magnetic attractive force to the other side.

  As a result, a magnetic member that can move in the axial direction is provided between the exciting coil and the disk-shaped member by not exciting the exciting coil during braking, or the disk-shaped member includes a magnetic material. However, the disk-shaped member can be moved to the one side in the axial direction using the biasing force of the elastic member. Further, when the brake is released, the exciting coil is excited to generate a magnetic attractive force that overcomes the urging force of the elastic member, so that the disk-like member can be moved to the other side in the axial direction even in the above case. Thus, the axial movement of the disk-shaped member can be smoothly performed using the balance between the magnetic attractive force of the exciting coil and the biasing force of the elastic member. In addition, since the braking state is set when the energization to the exciting coil is interrupted (so-called non-excited operation type), safety can be ensured by the fail-safe function.

  Preferably, the magnetic member further includes a magnetic member disposed so as to be movable in the axial direction while being interposed between the exciting coil and the disk-shaped member, and the elastic member is in contact with the magnetic member. The magnetic member is brought into contact with and pressed to one side in the axial direction, and the magnetic member moves to one side in the axial direction by being pressed by the elastic member at the time of braking, and contacts the disk-shaped member. The shaped member is brought into contact with the magnetic member from the other side in the axial direction at the time of braking, thereby contacting the fixed side member on the one side in the axial direction, and the exciting coil is at the time of releasing the brake. A magnetic attractive force in the other axial direction is applied to the magnetic member, and the magnetic member resists the pressing of the elastic member by the magnetic attractive force from the excitation coil when the brake is released. While said Moving to the other side in the direction and separated from the disk-shaped member, and the disk-shaped member is separated from the fixed-side member by allowing the magnetic member to move to the other side in the axial direction when the brake is released. It becomes possible.

  Accordingly, in the axial arrangement of the exciting coil and the elastic member, the magnetic member, the disk-like member, and the fixed side member in this order, the magnetic member is pressed against the disk-like member by the urging force of the elastic member during braking. Can be moved to one side in the axial direction to contact the fixed side member. Further, when the brake is released, the magnetic member is attracted by the magnetic attraction force of the exciting coil, thereby eliminating the pressing of the disk-like member by the magnetic member, thereby enabling the disc-like member to move to the other side in the axial direction. it can. When the disk-shaped member itself is made of a magnetic material, it can be actively driven to the other side in the axial direction by the magnetic attractive force of the exciting coil. Thus, the axial movement of the disk-shaped member can be smoothly performed using the balance between the magnetic attractive force of the exciting coil and the biasing force of the elastic member.

  Preferably, the contact member has a maximum movement distance of the disk-shaped member along the axial direction during the braking and when the braking is released in the axial direction during the braking and when the braking is released. The amount of movement is regulated so as to be smaller than the maximum movement distance of the magnetic body member along.

  As a result, the brake is released from the state in which the disk-shaped member is in contact with the fixed-side member during braking, and when the disk-shaped member and the magnetic body member move to the other side in the axial direction, before the movement of the magnetic body member is completed. The movement of the disk-shaped member is prevented by the contact member. As a result, after that, only the magnetic member moves to the other side in the axial direction without moving the disk-like member to the other side in the axial direction. Ensure separation along the direction. As a result, when the brake is released, the disc-like member separated from the fixed member can be reliably maintained in a state of being separated from the magnetic member on the opposite side, so that it is possible to reliably prevent wear and heat generation due to contact. it can.

  Preferably, the contact member has a predetermined gap between the fixed-side member and the disk-shaped member when the other axial side of the disk-shaped member contacts the contact member when the brake is released. The movement amount is regulated so that a predetermined gap is generated between the magnetic member and the disk-like member in a state where the gap is generated and moved to the other side in the axial direction.

  As a result, when the brake is released, the disk-shaped member that is separated from the fixed member and is in contact with the contact member can be reliably detected from the fixed member on one axial side and the magnetic member on the other axial side. It is possible to maintain a state separated from each other. As a result, wear and heat generation due to contact can be more reliably prevented.

  Preferably, the disk-shaped member includes a core plate made of a magnetic material.

  Thereby, it can be used with the other axial side on the upper side and the one axial side on the lower side. That is, in this case, from the upper side to the lower side, the exciting coil, the elastic member, the magnetic member, the disk-like member, and the stationary member are arranged in this order. In this arrangement, at the time of braking, the magnetic member can be pressed against the disk-like member by the urging force of the elastic member, and the disk-like member can be moved downward in the axial direction to come into contact with the fixed-side member. Also, when releasing the brake, the magnetic member and the disk-like member are attracted by the magnetic attractive force of the exciting coil, so that the pressing of the disk-like member by the magnetic member disappears and the disk-like member is actively driven to the upper side. The shaped member can be moved upward. In this way, it can be used with the other side in the axial direction as the upper side and one side in the axial direction as the lower side, and as described above, it can be used with the one side in the axial direction as the upper side and the other side in the axial direction as the lower side. You can also. That is, the above-described separated state of the disk-shaped member can be maintained regardless of the direction in which the weight of the disk-shaped member acts. Therefore, there is no restriction on the installation direction of the brake device, and the brake device can be installed freely.

In order to achieve the above object, a brake device according to the present invention is engaged with a torque transmission member attached to a rotating shaft of a braked device, and capable of transmitting rotation and moving in the axial direction with respect to the torque transmitting member. The disc-shaped member that moves to the one side in the axial direction during braking and contacts the fixed side member and can move to the other side in the axial direction when the brake is released, and the one side in the axial direction with respect to the disc-shaped member An elastic member for applying an urging force to the disk, an excitation coil that is excited when the brake is released and can apply a magnetic attraction force to the disk-like member toward the other side in the axial direction, the excitation coil, and the disk The magnetic member disposed between the cylindrical member and movably in the axial direction, and the disc-shaped member provided on the torque transmitting member and movable in the axial direction, the shaft Direction And a restricting means for restricting the amount of movement of the disk-like member toward the other side in the axial direction, and the elastic member abuts against the magnetic member and presses it toward the one side in the axial direction. The magnetic member moves to one side in the axial direction by being pressed by the elastic member at the time of braking, and contacts the disk-shaped member, and the disk-shaped member is By contacting the magnetic member from the other side in the axial direction, the fixed member on the one side in the axial direction is contacted, and the exciting coil is moved in the axial direction with respect to the magnetic member when the brake is released. A magnetic attraction force is applied to the other side, and the magnetic member moves to the other side in the axial direction against the pressing of the elastic member by the magnetic attraction force from the excitation coil when the brake is released. The disk-shaped member Spaced-apart,
The disk-shaped member can be separated from the fixed-side member by allowing the magnetic member to move to the other side in the axial direction when the brake is released.

  The brake device of the present invention includes a torque transmission member attached to the rotating shaft of the braked device. The torque transmitting member is provided with a disk-shaped member that can move in the axial direction while transmitting rotation, and the rotating shaft of the braked device is braked using the disk-shaped member. That is, in the axial arrangement of the exciting coil and the elastic member, the magnetic member, the disk-like member, and the fixed-side member in this order, the magnetic member is pressed against the disk-like member by the urging force of the elastic member during braking. The shaped member can be moved to one side in the axial direction and brought into contact with the fixed side member. As a result of the contact, the frictional force of the fixed side member acts on the disk-shaped member, so that the rotation of the disk-shaped member is braked. As a result, the rotation shaft of the driven device that is engaged with the disk-like member so as to be able to transmit the rotation is stationary. On the other hand, when the brake is released, the magnetic member is attracted by the magnetic attractive force of the exciting coil, thereby eliminating the pressing of the disk-like member by the magnetic member, thereby enabling the disc-like member to move to the other side in the axial direction. Can do. When the disk-shaped member itself is made of a magnetic material, it can be actively driven to the other side in the axial direction by the magnetic attractive force of the exciting coil.

  At this time, the amount of movement of the disk-shaped member toward the other side in the axial direction is restricted by the restriction means. As described above, in the present invention, even if the pressing of the magnetic member to the one side in the axial direction with respect to the disk-shaped member disappears, the movement of the disk-shaped member to the other side in the axial direction is not completely free. , Certain regulations are enforced. For example, when it is used with one side in the axial direction on the upper side and the other side in the axial direction on the lower side, the disc-shaped member is separated from the fixed side member by its own weight when the contact with the fixed side member is eliminated. To prevent the disc-shaped member separated as described above from moving to the other side in the axial direction toward the other member on the opposite side to the stationary member and coming into contact with the other member. Can do. As a result, the disc-shaped member that is separated from the fixed-side member at the time of braking release can be maintained in a state of being separated from other members on the opposite side of the fixed-side member. Can be prevented.

  In order to achieve the above object, a rotating electrical machine according to the present invention is engaged with a rotating body so as to be able to transmit rotation to the rotating body and move in the axial direction, and is fixed by moving to one side in the axial direction during braking. A disc-like member that contacts the side member and is movable toward the other side in the axial direction when the brake is released; and a driving force for moving the disc-like member toward the one side in the axial direction when the brake is released. The driving means capable of applying a driving force for moving the disk-shaped member to one side in the axial direction during braking and the amount of movement of the disk-shaped member to the other side in the axial direction And restricting means for restricting.

  The rotating electrical machine of the present invention includes a rotating body. The rotating body is provided with a disk-shaped member that can move in the axial direction while transmitting the rotation, and braking of the rotating body is performed using the disk-shaped member. That is, at the time of braking, the disk-shaped member moves to the one side in the axial direction by the driving force from the driving means and contacts the fixed side member. As a result of the contact, the frictional force of the fixed side member acts on the disk-shaped member, so that the rotation of the disk-shaped member is braked. Thereby, the rotating body engaged with the disk-shaped member so as to be able to transmit the rotation is stationary. On the other hand, when the brake is released, the driving force is not applied by the driving means, and the disk-like member can move to the other side in the axial direction.

  At this time, in the present invention, the amount of movement of the disk-shaped member toward the other side in the axial direction is regulated by the regulating means. That is, even when the driving force applied to the one side in the axial direction by the driving means disappears, the movement of the disk-shaped member to the other side in the axial direction is not completely free, and certain regulation is performed. For example, when it is used with one side in the axial direction on the upper side and the other side in the axial direction on the lower side, the disc-shaped member is separated from the fixed side member by its own weight when the contact with the fixed side member is eliminated. To prevent the disc-shaped member separated as described above from moving to the other side in the axial direction toward the other member on the opposite side to the stationary member and coming into contact with the other member. Can do. As a result, the disc-shaped member that is separated from the fixed-side member at the time of braking release can be maintained in a state of being separated from other members on the opposite side of the fixed-side member. Can be prevented.

  Preferably, the rotating body includes a rotor, a motor shaft, and a torque transmission member attached to the motor shaft, and the disk-shaped member is capable of transmitting rotation to the torque transmission member and is axially Is movably engaged.

  By restricting the amount of movement of the disc-shaped member that is movable in the axial direction with respect to the torque transmission member attached to the motor shaft, it is possible to sufficiently prevent the disc-shaped member from wearing or generating heat when the brake is released. it can.

  According to the present invention, wear and heat generation at the time of braking release can be sufficiently prevented.

It is a longitudinal section showing the whole electric motor structure provided with the electromagnetic brake device by one embodiment of the present invention. It is the partial extraction enlarged view in FIG. 1 showing the detailed structure of a hub, and the arrow view seen from the A direction in FIG. 2 (a). It is explanatory drawing which shows the braking state or braking releasing state of an electromagnetic brake device. It is a figure which shows the example of installation of a rotary electric machine. FIG. 6 is a side sectional view showing a detailed structure of a modified example of the hub shape, and an arrow view seen from the B direction in FIG. FIG. 7 is a side sectional view showing a detailed structure of another modified example of the hub shape, and an arrow view seen from the direction C in FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a longitudinal sectional view showing the overall structure of an electric motor 1, which is a rotating electrical machine including a brake device 100 according to an embodiment of the present invention.

  In FIG. 1, an electric motor 1 includes a rotor 2 having a motor shaft 3 as a rotating shaft, a stator 4, a load side bracket 5a, an anti-load side bracket 5b, and a load side and an anti-load side bracket 5a. 5b, bearings 6a and 6b that respectively support both ends of the motor shaft 3 and the non-excitation operation type for braking the anti-load side (left side in FIG. 1) of the motor shaft 3. And the electromagnetic brake device 100 according to the embodiment.

  The motor shaft 3 is disposed in the left-right direction (axial direction) shown in FIG. As for the motor shaft 3, the anti-load side (left side in FIG. 1) protrudes from the anti-load side bracket 5b, and the electromagnetic brake device 100 is provided at the protruding portion. In other words, the electric motor 1 constitutes a braked device of the electromagnetic brake device 100. On the left side of the electromagnetic brake device 100 in FIG. 1, a detector 8 that detects the rotation of the motor shaft 3, such as an encoder, and a detector cover 9 are provided.

  The electromagnetic brake device 100 has a hub 21 as a torque transmission member fixed to the outer peripheral portion of the motor shaft 3, a field core 27 containing the exciting coil 23 and the spring 25, and the field core 27 facing the axial direction. And an armature 29 as a magnetic member disposed on one side in the axial direction (right side in FIG. 1, the same applies hereinafter), and a side plate as a stationary member disposed on the one axial side of the armature 29 31 and a brake disc 33 as a disk-like member disposed between the side plate 31 and the armature 29 and engaged with the hub 21 (details will be described later). The motor shaft 3, the hub 21, and the rotor 2 constitute a rotating body described in each claim.

  The field core 27 includes an inner cylindrical portion 27A, an outer cylindrical portion 27B, and a bottom plate portion 27C. A radial space between the inner cylindrical portion 27 </ b> A and the outer cylindrical portion 27 </ b> B is a coil recess 35 that is released to the right side in FIG. 1, and the excitation coil 23 is accommodated in the coil recess 35. . In addition, a plurality of spring recesses 37 are formed in the circumferential direction at appropriate regular intervals on the surface on the one axial side of the outer cylindrical portion 27B, and each of the spring recesses 37 is an elastic spring that is a compression coil spring. The spring 25 as a member is accommodated. These springs 25 exert an urging force that presses the armature 29 toward one side in the axial direction. Note that the surfaces on the one axial side of the inner cylindrical portion 27A and the outer cylindrical portion 27B form a magnetic pole surface that magnetically attracts the armature 29. The spring 25 and the exciting coil 23 constitute drive means described in each claim.

  The armature 29 is formed in a disk shape from an appropriate magnetic material (for example, a steel plate), and includes a through hole 29a on the radial center side. The armature 29 is disposed between the field core 27 and the brake disc 33 so as to be movable only in the axial direction.

  The side plate 31 is formed in a disk shape and includes a through hole 31a on the center side in the radial direction. The outer peripheral edge portion of the side plate 31 is fixed to the outer cylindrical portion 27B of the field core 27 by a plurality of fixing screws 41 with a collar 39 interposed therebetween. The collar 39 is inserted and disposed in a recess 29 b formed on the outer periphery of the armature 29, and prevents the armature 29 from rotating.

  The brake disk 33 includes a core plate 43, a friction material 45, and a friction material 47. The core plate 43 is formed in a disk shape by an appropriate magnetic material, and has a spline 43a on its inner peripheral surface. Due to the engagement between the spline 43a and the spline 21a provided on the hub 21, the brake disk 33 is provided so as to be movable in the axial direction and not rotatable (in other words, capable of transmitting rotation) with respect to the hub 21.

  A friction material 45 is attached to the surface on one side in the axial direction of the outer peripheral side edge of the core plate 43, that is, the surface facing the side plate 31, and the other axial end of the outer peripheral side edge of the core plate 43 in the axial direction. A friction material 47 is attached to the side (left side in FIG. 1, the same applies hereinafter), that is, the surface facing the armature 29. Instead of providing the friction material 45 and the friction material 47 on the core plate 43, the friction material 45 and the friction material 47 may be provided on the side plate 31 or the armature 29 side which are opposing members.

  2A is a partially extracted enlarged view in FIG. 1 showing the detailed structure of the hub 21, and FIG. 2B is an arrow view seen from the direction A in FIG. 2A. 2A and 2B, a through hole 21b for penetrating and fixing the motor shaft 3 is provided on the inner peripheral side of the hub 21. On the outer peripheral side of the hub 21, the spline 21a formed as a sawtooth convex portion is formed by, for example, a wire cutting technique. As described above, the spline 21 a is engaged with the spline 43 a of the core plate 43 of the brake disk 33. In addition, a projection 21c as a contact member is provided at the other axial end of each spline 21a. The protrusion 21c constitutes a restricting means for restricting the movement of the brake disc 33 in the axial direction (details will be described later).

  Next, the operation of the electromagnetic brake device 100 provided in the electric motor 1 having the above configuration will be described with reference to FIG. 3 corresponding to an enlarged view of a main part of the structure shown in FIG.

  FIG. 3A shows a braking state in which the exciting coil 23 is not energized (= non-excited state) and braking by the electromagnetic brake device 100 is performed. In FIG. 3A, in this braking state, the armature 29 moves to one axial side (the right side in the figure) by being pressed by the spring 25 and contacts the brake disc 33, and the brake disc 33 is in the other axial direction. The armature 29 comes into contact with the side plate 31 from the side (left side in the figure). As a result, the brake disc 33 is clamped and braked by the armature 29 and the side plate 31, whereby the rotation of the motor shaft 3 of the electric motor 1 is braked (the motor shaft 3 that is rotating in inertia is stationary, Alternatively, the motor shaft 3 is maintained in a stationary state by holding the motor shaft 3 when an external force (torque) is applied to the stationary motor shaft 3).

  In this braking state, the axial length of the collar 39 is set so that a slight gap G1 is formed between the armature 29 and the field core 27. The dimension of the gap G1 is, for example, about 0.05 to 0.3 mm. In this braking state, a gap G2 is formed between the protrusion 21c of the hub 21 and the brake disk 33 (specifically, the core plate 43). The sizes of the gaps G1 and G2 are G2 <G1 corresponding to the movement amount regulating function of the brake disc 33 by the protrusion 21c of the hub 21 described above.

  FIG. 3B shows a braking release state in which the exciting coil 23 is energized (= excited state) and braking by the electromagnetic brake device 100 is not performed. In FIG. 3B, in this braking state, the exciting coil 23 applies a magnetic attractive force to the armature 29 and the brake disc 33 toward the other side in the axial direction (the left side in the drawing). As a result, the armature 29 and the brake disc 33 move to the other side in the axial direction while resisting the biasing force of the spring 25 that presses the armature 29. As a result, the brake disc 33 is separated from the side plate 31, the brake disc 33 is released from the braking, and the motor shaft 3 of the electric motor 1 can rotate.

  Thus, when the armature 29 and the brake disc 33 move to the other side in the axial direction, the movement of the brake disc 33 on the other side in the axial direction is such that the surface on the other side in the axial direction of the core plate 43 is the protrusion 21c of the hub 21. Is stopped at the point where it abuts against (stops to the state of G2 = 0). Here, since G2 <G1 as described above, the armature 29 further moves to the other side in the axial direction even after the movement of the brake disk 33 to the other side in the axial direction is stopped by the protrusion 21c in this way. To move away from the brake disk 33 and closely contact the magnetic pole surface of the field core 27 (that is, the state of G1 = 0 described above).

  As can be seen from the above behavior, the size of the gap G1 corresponds to the maximum movement distance of the armature 29 along the axial direction in the above-described braking state and the braking release state. The dimension of the gap G2 corresponds to the maximum moving distance of the brake disc 33 along the axial direction in the above-described braking state and the braking release state. As described above, the protrusion 21c of the hub 21 regulates the axial movement amount of the brake disk 33 so that these dimensions are G2 <G1, so that the brake disk 33 is separated from the armature 29 in this brake released state. .

  Specifically, in the state in which the core plate 43 is in contact with the protrusion 21c and the brake disc 33 is stopped in this brake released state, the brake disc 33 (specifically, the friction material 45) is interposed between the side plate 31 and the brake plate 33. A predetermined gap g1 is generated, and a predetermined gap g2 is also generated between the brake disk 33 (specifically, the friction material 47) and the armature 29. As a result, the brake disc 33 is separated from the armature 29 and the side plate 31 in this brake released state.

  As described above, in the electromagnetic brake device 100 of the present embodiment, the brake disk 33 is moved to the side by the magnetic attraction force of the excitation coil 23 from the braking state in which the brake disk 33 is brought into contact with the side plate 31 and braking is performed. It leaves | separates from the plate 31 and will be in a brake release state. At that time, the protrusion 21c provided on the hub 21 regulates the amount of movement of the brake disc 33 that moves to the other side in the axial direction (armature 29 side), and the movement is prevented when the core plate 43 comes into contact. As a result, the brake disc 33 is reliably separated from the armature 29 and the side plate 31 in the brake released state. As a result, unlike the conventional structure, it is possible to sufficiently prevent wear and heat generation due to contact in the brake release state. This also has the effect that it is possible to design an electromagnetic brake that has a thermal margin and to design an electromagnetic brake that does not need to take into account changes in the brake suction force due to wear. Furthermore, since the core plate 43 is made of a magnetic material, there are no restrictions on material selection and processing methods, and there is an effect that a cheaper electromagnetic brake can be provided.

  Further, with the structure as described above, the side plate 31 and the brake disc 33 are arranged from the upper side to the lower side with the rotating electric machine 1 as shown in FIG. Further, a structure in which the armature 29 and the field core 27 are arranged in this order is also possible. That is, in this arrangement, when the brake disk 33 is separated from the side plate 31 by the magnetic attractive force of the exciting coil 23 in the brake released state, the weight of the brake disk 33 is supported by the protrusion 21c of the hub 21, and the brake disk 33 is A state of being separated from the armature 29 in the vertical direction can be ensured. As a result, it is possible to prevent the weight of the brake disc 33 from being applied to the armature 29 and to sufficiently prevent the wear and heat generation from being caused by the contact due to the weight.

  In addition, by using a magnetic material for the core plate 43, the installation direction of the rotating electrical machine 1 as shown in FIG. A structure in which the field core 27, the armature 29, the brake disk 33, and the side plate 31 are arranged in this order from the top to the bottom while the motor shaft 3 is in the vertical vertical direction is also possible. That is, by making the material of the core plate 43 a magnetic material, the brake disk 33 is not moved downward by its own weight in the brake released state, and the brake disk 33 is projected by the magnetic attraction force of the exciting coil 23 to the protrusion 21c of the hub 21. Move upward until it comes into contact. As a result, unlike the above-described conventional structure, there is no restriction on the installation direction of the rotating electrical machine 1, and it can be installed freely.

  In the above description, the core plate 43 of the brake disk 33 is a magnetic body, but is not limited thereto. The core plate 43 may be a nonmagnetic material. Even in this case, the protrusion 21c can sufficiently prevent wear and heat generation due to contact due to its own weight in the installation direction shown in FIG.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit and technical idea of the present invention. Hereinafter, such modifications will be described in order.

(1) Hub shape variations (1)
That is, in the said embodiment, it is not restricted to the hub 21 of the shape shown to FIG.2 (b) in Fig.2 (a), Another shape is also possible. FIG. 5 (a) is a diagram showing the detailed structure of the hub 21A according to such a modification, and FIG. 5 (b) is an arrow view seen from the direction B in FIG. 5 (a). It is a figure corresponding to 2 (a) and FIG.2 (b).

  5A and 5B, as in the hub 21 of the above embodiment, a through hole 21Ab for penetrating and fixing the motor shaft 3 is provided on the inner peripheral side of the hub 21A. . Further, on the outer peripheral side of the hub 21A, a spline 21Aa formed as a sawtooth convex portion is formed, for example, by processing using a hobbing machine. In this case, as shown in the figure, the hobbing tool escape 121 is formed. The spline 21 </ b> Aa is engaged with the spline 43 a of the core plate 43 of the brake disc 33. Further, a projection 21Ac as an abutting member is provided over the entire circumference in the other axial end of each spline 21Aa, and similarly to the above, it constitutes a restricting means for restricting the movement of the brake disc 33 in the axial direction. .

  Even when the hub 21A of this modification is used, the same effect as the above embodiment is obtained. Further, the hub 21A in the present modification has an effect that it is superior in mass productivity and can be manufactured at a lower cost than the hub 21 of the above-described embodiment.

(2) Hub shape variations (2)
FIG. 6A is a diagram showing the detailed structure of the hub 21B according to still another modified example, and FIG. 6B is a view as seen from the direction C in FIG. It is a figure corresponding to 2 (a) and FIG.2 (b).

  6 (a) and 6 (b), the hub 21B according to the present modification has a substantially rectangular tube shape in order to transmit torque to the brake disk 33 instead of the splines 21a and 21Aa of the hubs 21 and 21A. Torque transmission part 21Ba is provided. The torque transmission portion 21Ba engages with a square hole (not shown) provided in the core plate 43 of the brake disc 33. Thereby, the brake disc 33 is engaged with the hub 21B so as to be movable in the axial direction and capable of transmitting rotation. Similarly to the above, a through hole 21Bb for penetrating and fixing the motor shaft 3 is provided on the inner peripheral side of the hub 21B. Further, a substantially flange-shaped projection 21Bc as an abutting member is provided at the other axial end of the torque transmitting portion 21Ba, and similarly to the above, it constitutes a restricting means for restricting the movement of the brake disc 33 in the axial direction. .

  Even when the hub 21B of this modification is used, the same effects as those of the above embodiment and the modification of (1) are obtained. Further, the hub 21B of this modification can be manufactured at a lower cost than the hub 21A of the modification (1).

  In addition to those already described above, the methods according to the above-described embodiments and modifications may be used in appropriate combination.

  In addition, although not illustrated one by one, the present invention is implemented with various modifications within a range not departing from the gist thereof.

1 Rotating electric machine (braking device)
2 Rotor (Rotating body)
3 Motor shaft (rotating shaft, rotating body)
21 Hub (torque transmission member, rotating body)
21c Protrusion (contact member, restricting means)
23 Excitation coil (drive means)
25 Spring (elastic member, drive means)
29 Armature (Magnetic member)
31 Side plate (fixed side member)
33 Brake disc (disc-shaped member)
100 Electromagnetic brake device

Claims (10)

A torque transmission member attached to the rotating shaft of the braked device;
The torque transmission member is engaged so as to be able to transmit rotation and move in the axial direction, moves to one side in the axial direction during braking, contacts the fixed side member, and can move to the other side in the axial direction when releasing the brake. A disk-shaped member,
When the brake is released, a driving force for moving the disk-shaped member to one side in the axial direction is not applied to the disk-shaped member, and for the movement to the one side in the axial direction with respect to the disk-shaped member during the braking. A driving means capable of applying a driving force;
Restriction means for restricting the amount of movement of the disk-shaped member to the other side in the axial direction;
Brake device characterized by having. The brake device according to claim 1, wherein
The regulating means is
A brake device comprising: an abutting member that is provided on the torque transmitting member and is capable of abutting from the other side in the axial direction with respect to the disk-shaped member that is movable in the axial direction. The brake device according to claim 2, wherein
The driving means includes
An elastic member for applying an urging force to one side in the axial direction with respect to the disk-shaped member;
An excitation coil that is excited when the brake is released and can apply a magnetic attraction force to the disk-like member toward the other side in the axial direction;
A brake device comprising: The brake device according to claim 3,
A magnetic member disposed between the exciting coil and the disk-shaped member and arranged to be movable in the axial direction;
The elastic member is
Abutting against the magnetic member and pressing toward one side in the axial direction;
The magnetic member is
At the time of braking, the elastic member is pressed to move to the one side in the axial direction to contact the disk-shaped member,
The disk-shaped member is
At the time of braking, by contacting the magnetic member from the other side in the axial direction, the fixed side member on one side in the axial direction is contacted,
The excitation coil is
When releasing the brake, the magnetic member is given a magnetic attractive force toward the other side in the axial direction,
The magnetic member is
At the time of braking release, the magnetic attraction force from the excitation coil moves away from the disk-shaped member by moving to the other side in the axial direction while resisting the pressing of the elastic member,
The disk-shaped member is
The brake device according to claim 1, wherein the magnetic member can be moved away from the stationary member when the magnetic member can move to the other side in the axial direction when the brake is released. The brake device according to claim 4,
The contact member is
The maximum movement distance of the disk-shaped member along the axial direction at the time of braking and at the time of braking release is the maximum movement distance of the magnetic member along the axial direction at the time of braking and release of the braking. The brake device is characterized in that the amount of movement is restricted so as to be smaller than that. The brake device according to claim 5, wherein
The contact member is
When the other axial side of the disk-shaped member contacts the contact member when the brake is released, a predetermined gap is formed between the fixed-side member and the disk-shaped member, and the other axial side The brake device is characterized in that the amount of movement is regulated so that a predetermined gap is formed between the magnetic member and the disk-like member in a state of being moved to the right. The brake device according to any one of claims 4 to 6,
The disk-shaped member is
A brake device comprising a core plate made of a magnetic material. A torque transmission member attached to the rotating shaft of the braked device;
The torque transmission member is engaged so as to be able to transmit rotation and move in the axial direction, moves to one side in the axial direction during braking, contacts the fixed side member, and can move to the other side in the axial direction when releasing the brake. A disk-shaped member,
An elastic member for applying an urging force to one side in the axial direction with respect to the disk-shaped member;
An excitation coil that is excited when the brake is released and can apply a magnetic attraction force to the disk-like member toward the other side in the axial direction;
A magnetic member disposed so as to be movable in the axial direction while being interposed between the exciting coil and the disk-shaped member,
A restricting means provided on the torque transmitting member, which abuts on the disk-shaped member movable in the axial direction from the other side in the axial direction and regulates the amount of movement of the disk-shaped member toward the other axial direction. When,
Have
The elastic member is
Abutting against the magnetic member and pressing toward one side in the axial direction;
The magnetic member is
At the time of braking, the elastic member is pressed to move to the one side in the axial direction to contact the disk-shaped member,
The disk-shaped member is
At the time of braking, by contacting the magnetic member from the other side in the axial direction, the fixed side member on one side in the axial direction is contacted,
The excitation coil is
When releasing the brake, the magnetic member is given a magnetic attractive force toward the other side in the axial direction,
The magnetic member is
At the time of braking release, the magnetic attraction force from the excitation coil moves away from the disk-shaped member by moving to the other side in the axial direction while resisting the pressing of the elastic member,
The disk-shaped member is
The brake device according to claim 1, wherein the magnetic member can be moved away from the stationary member when the magnetic member can move to the other side in the axial direction when the brake is released. A rotating body,
It is engaged with the rotating body so as to be able to transmit rotation and move in the axial direction, moves to one side in the axial direction during braking, contacts the fixed side member, and can move to the other side in the axial direction when releasing the brake. A disk-shaped member;
When the brake is released, a driving force for moving the disk-shaped member to one side in the axial direction is not applied to the disk-shaped member, and for the movement to the one side in the axial direction with respect to the disk-shaped member at the time of braking. A driving means capable of applying a driving force;
Restriction means for restricting the amount of movement of the disk-shaped member to the other side in the axial direction;
A rotating electric machine comprising: The rotating electrical machine according to claim 9, wherein
The rotating body is
A rotor,
A motor shaft;
A torque transmission member attached to the motor shaft,
The disk-shaped member is
A rotating electrical machine that is engaged with the torque transmitting member so as to be able to transmit rotation and move in an axial direction.

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