Electromagnetic brake device for motor

Abstract

To provide an electromagnetic brake device for a motor in which idling wear is not generated at non-operation of a brake.SOLUTION: An electromagnetic brake device for a motor has a housing 1 that rotatably stores a rotary shaft portion 2 of a motor, a hub 3 that is attached to an outer periphery of the rotary shaft portion 2, and a friction member 4 that rotates with the hub 3 and can move in a direction of a rotation axis L. The friction member 4 has a platy portion 41, and a friction portion 42 provided at an outer diameter portion of the platy portion 41. On both surfaces in the direction of the rotation axis L of the hub 3, a pair of holding plates 7 covering at least a part of the friction member 4 is provided. Inner diameter portions 72 of the pair of holding plates 7 are fixed to the hub 3.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to an electromagnetic brake device for a motor. [Background technology]

[0002] Known types of electromagnetic brakes include non-excitation actuated electromagnetic brakes that use the force of a spring to brake when de-energized, and magnetic actuated electromagnetic brakes that use the electromagnetic force of an electromagnet to brake when energized. In both non-excitation actuated and magnetic actuated electromagnetic brakes, the friction plates are attached so that they can move in the direction of the rotation axis. When the brake is not in operation, the friction plates are pressed against the plate by their own weight, causing idling wear. For example, Patent Document 1 discloses a brake device that prevents idling wear. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-252111 Summary of the Invention [Problem to be solved by the invention]

[0004] The brake device disclosed in Patent Document 1 prevents idling wear when the brake is not applied by holding the friction plate with a support spring. However, because the support spring is in line contact with the friction plate, vibration of the friction plate occurs during rotation, which may cause unstable rotation.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an electromagnetic brake device for a motor that does not experience wear due to idling when the brake is not operating. [Means for solving the problem]

[0006] An electromagnetic brake device for a motor according to one aspect of the present invention includes a housing that rotatably accommodates a rotating shaft of a motor, a hub attached to the outer periphery of the rotating shaft, and a friction member that is rotatable with the hub and movable in the direction of the rotation axis. The friction member has a plate-shaped portion and a friction portion provided on the outer diameter portion of the plate-shaped portion. A pair of retaining plates that cover at least a portion of the friction member are provided on both sides of the hub in the direction of the rotation axis. The inner diameter portions of the pair of retaining plates are fixed to the hub. [Effects of the Invention]

[0007] In the electromagnetic brake device for a motor of the present invention, the support plate is fixed to the hub with a caulking pin, and the friction plate is held from both sides by the support plate, thereby maintaining its position in the direction of the rotation axis. Therefore, it is possible to prevent idling wear caused by the friction plate being pressed against the plate by its own weight when the brake is not operating, [Brief explanation of the drawings]

[0008] [Figure 1] 3 is a diagram showing a brake non-operating state of the electromagnetic brake device for a motor according to the present embodiment. FIG. [Figure 2] FIG. [Figure 3] FIG. 2 is a perspective view, partially in section, of an assembled friction member and a hub. [Figure 4] FIG. [Figure 5] FIG. 4 is a cross-sectional view showing a state in which the friction member is assembled to the hub. [Figure 6] 3A and 3B are diagrams illustrating a brake operating state of the electromagnetic brake device for a motor according to the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, the present embodiment will be described with reference to the drawings. For the sake of convenience, the description of components having the same reference numbers as those already described in the description of the embodiment will be omitted. Furthermore, for the sake of convenience, the dimensions of each component shown in the drawings may differ from the actual dimensions of each component.

[0010] 1 is a diagram showing the electromagnetic brake device for a motor according to this embodiment in a brake inoperative state. As shown in Fig. 1, the electromagnetic brake device for a motor includes a rotating shaft 2 that rotates about a rotation axis L, a hub 3, a friction member 4, an elastic member 5, an electromagnet 6, a retaining plate 7, and a housing 1.

[0011] The rotating shaft 2 is rotated around a rotation axis L by a motor (not shown). The rotating shaft 2 is connected to an output shaft of the motor. The rotating shaft 2 is rotatably supported by a bearing (not shown) relative to the housing 1.

[0012] The hub 3 is attached to the outer periphery of the rotating shaft portion 2. The hub 3 has a cylindrical main body portion 32 and a flange portion 31 that extends outward from the main body portion 32. For example, spline grooves or key grooves may be provided on the inner circumferential surface of the main body portion 32 and the outer circumferential surface of the rotating shaft portion 2, making the rotating shaft portion 2 and the hub 3 non-rotatable relative to each other. Alternatively, the hub 3 may simply be press-fitted into the rotating shaft portion 2, making them non-rotatable relative to each other.

[0013] FIG. 2 is a perspective view of the friction member 4. The friction member 4 is a flat, ring-shaped member through whose center the rotating shaft portion 2 and hub 3 are inserted. The friction member 4 has a plate-shaped portion 41 and a pair of friction portions 42. The friction portions 42 are brake shoes and are members with a high coefficient of friction. The pair of friction portions 42 are attached to one side and the other side of the plate-shaped portion 41 in the direction of the rotation axis L. The direction perpendicular to the direction of the rotation axis L is called the radial direction. The plate-shaped portion 41 is divided into two at an arbitrary ratio in the radial direction, with the inner portion called the inner diameter portion and the outer portion called the outer diameter portion. The friction portions 42 are provided on the outer diameter portion of the plate-shaped portion 41.

[0014] FIG. 3 is a perspective view showing the friction member 4 and hub 3 combined together. For ease of explanation, a portion is cut away. As shown in FIG. 3, spline grooves are provided on the outer peripheral surface of the flange portion 31 of the hub 3. Spline grooves having a shape corresponding to that of the flange portion 31 are also provided on the inner peripheral surface of the plate-shaped portion 41 of the friction member 4. These spline grooves are provided on the inner diameter portion of the plate-shaped portion of the friction member 4 and do not reach the outer diameter portion. In other words, the bottom of the spline groove does not reach the friction portion 42 of the friction member 4 in the radial direction.

[0015] The friction member 4 is spline-engaged with the hub 3 so that the spline grooves mesh with each other. Therefore, the friction member 4 does not rotate relative to the hub 3 around the rotation axis L, but is movable in the direction of the rotation axis L. In other words, the friction member 4 can rotate together with the hub 3.

[0016] FIG. 4 is a perspective view of a pair of holding plates 7. The holding plates 7 are bottomless, dish-shaped members. A hole is provided in the center of each holding plate 7, through which the rotating shaft 2 and the hub 3 are inserted. Each holding plate 7 has an inner diameter portion 72, an outer diameter portion 71, and an elastically deforming portion 73. The inner diameter portion 72 and the outer diameter portion 71 are located at different positions in the direction of the rotation axis L. Therefore, the elastically deforming portion 73 connects the inner diameter portion 72 and the outer diameter portion 71 in the radial direction and also in the direction of the rotation axis L. The elastically deforming portion 73 also has a plurality of holes 75 that penetrate in the direction of the rotation axis L. These holes 75 are arranged at equal intervals along the circumferential direction. The holes 75 make the elastically deforming portion 73 more susceptible to elastic deformation than other portions.

[0017] A plurality of crimping pin insertion holes 74 are formed in the inner diameter portion 72 of each holding plate 7, penetrating in the direction of the rotation axis L. These crimping pin insertion holes 74 are arranged at equal intervals in the circumferential direction. The crimping pin insertion holes 74 are configured so that crimping pins 8 are inserted into them, and the inner diameter portions 72 of the pair of holding plates 7 are fixed to the flange portion 31 of the hub 3.

[0018] FIG. 5 is a cross-sectional view showing the friction member 4 assembled to the hub 3. As shown in FIG. 5, the friction member 4 is sandwiched and held between a pair of retaining plates 7 in the direction of the rotation axis L. The inner diameter portions 72 of the pair of retaining plates 7 are fixed to one and the other surfaces of the flange portion 31 of the hub 3 in the direction of the rotation axis L. A crimping pin 8 is inserted through the inner diameter portions 72 of the pair of retaining plates 7 with the flange portion 31 sandwiched between them. The crimping pin 8 is inserted into a crimping pin insertion hole 74 in the inner diameter portions 72 of the retaining plates 7. The outer diameter portions 71 of the pair of retaining plates 7 sandwich the inner diameter portion of the friction member 4 in the direction of the rotation axis L. As shown in the figure, the inner diameter portion 72 may sandwich the friction member 4 over the entire circumference. Alternatively, a notch or a hole may be provided in the inner diameter portion 72 so that a portion of the inner diameter portion 72 comes into contact with the friction member 4.

[0019] When a force acts on the friction member 4 to displace it in the direction of the rotation axis L relative to the hub 3, the elastic deformation portion 73 of the retaining plate 7 deforms, allowing the friction member 4 to displace in the direction of the rotation axis L relative to the hub 3. As described in Figure 3, the friction member 4 does not rotate around the rotation axis L relative to the hub 3.

[0020] Returning to FIG. 1 , the housing 1 includes a side plate 12, an armature 13, and a yoke 14. In the direction of the rotation axis L, the friction member 4 is located between the side plate 12 and the armature 13. The armature 13 is displaceable in the direction of the rotation axis L relative to the yoke 14. The elastic member 5 exerts an elastic restoring force in a direction that moves the armature 13 away from the yoke 14.

[0021] The electromagnet 6 is fixed to the yoke 14. When the electromagnet 6 is energized, an electromagnetic force is generated in a direction that attracts the armature 13 toward the yoke 14. In the brake inoperative state shown in FIG. 1, the electromagnet 6 is energized, and the armature 13 is attracted toward the yoke 14 against the elastic restoring force of the elastic member 5. Therefore, the friction member 4 is not in contact with the armature 13 and the side plate 12, and no braking force is generated.

[0022] Fig. 6 is a diagram showing the brake operating state of the electromagnetic brake device for a motor. As shown in Fig. 6, in a non-excited state where the electromagnet 6 is not energized, the elastic restoring force of the elastic member 5 moves the armature 13 in a direction away from the yoke 14. As a result, the friction portion 42 of the friction member 4 is sandwiched between the side plate 12 and the armature 13, generating a braking force. In other words, the elastic member brings the friction member 4 into contact with the side plate 12 of the housing 1 and the armature 13 (contact portion). At this time, the friction portion 42 is pressed by the armature 13 toward the side plate 12 in the direction of the rotation axis L. As the elastic deformation portion 73 of the retaining plate 7 deforms, the outer diameter portion 71 of the retaining plate 7 supporting the friction portion 42 is allowed to be displaced toward the side plate 12 in the direction of the rotation axis L relative to the inner diameter portion 72.

[0023] 1 from the state shown in Fig. 6, the elastic restoring force of the elastic member 5 no longer acts on the armature 13. Then, the elastically deformable portion 73 of the retaining plate 7 returns to its original shape by its own elastic restoring force, and holds the friction member 4 at a position separated from the side plate 12 and the armature 13.

[0024] As described above, in the electromagnetic brake device for a motor of this embodiment, the inner diameter portions 72 of the pair of retaining plates 7 are fixed to the flange portion 31 with the caulking pins 8, and the outer diameter portions 71 of the pair of retaining plates 7 are in surface contact with the friction member 4, sandwiching it therebetween. The retaining plates 7 elastically deform to support the friction member 4 so that it can move in the direction of the rotation axis L relative to the hub 3. Therefore, when the brake is activated, the friction member 4 is allowed to move to a position where it contacts the contact portions (the side plates 12 and the armature 13), while when the brake is not activated, the friction member 4 can be stably held in a position separated from the contact portions. This prevents the friction member from being pressed against the side plate by its own weight when the brake is not operating, as in Patent Document 1, and prevents the friction member and the side plate from idling and wearing out when the motor is rotating.

[0025] Furthermore, in Patent Document 1, for example, the retaining spring is in line contact with the friction member. In contrast to this, according to the motor brake device of this embodiment, the outer diameter portions 71 of the pair of retaining plates 7 are in surface contact with the friction member 4, sandwiching it between them. This reduces vibration of the friction member 4 when the brake is not operating, allowing the rotating shaft portion 2 to rotate stably. From the perspective of rotational stability of the rotating shaft portion 2, it is desirable that the diameter of the retaining plates 7 be 80% or more of the inner diameter 41a of the friction member 4, or 65% or more of the outer diameter 41b of the friction member 4.

[0026] Furthermore, when the inner diameter portions 72 of the pair of retaining plates 7 are fixed to the flange portion 31 of the hub 3, the elastic deformation portions 73 elastically deform, and the outer diameter portions 71 of the pair of retaining plates 7 are provided along the friction member 4, making surface contact with the friction member 4 to sandwich it. Therefore, the pair of retaining plates 7 can secure the area for sandwiching the friction member 4 and can fix the friction member 4 in the direction of the rotation axis L with a small force. This reduces vibration of the friction member 4 during rotation of the motor, and improves the rotation stability of the motor. Furthermore, since the multiple crimping pin insertion holes 74 are equally spaced concentrically on the inner diameter portions 72 of the pair of holding plates 7, the multiple crimping pins 8 are also equally spaced concentrically. Therefore, the friction member 4 can be fixed in the direction of the rotation axis L with a small force so as not to interfere with the brake torque when the brake is activated. This reduces vibration of the friction member 4 during rotation and improves rotation stability.

[0027] Each of the pair of holding plates 7 may have an inner diameter portion 72, an outer diameter portion 71, and an elastically deformable portion 73 connecting the inner diameter portion 72 and the outer diameter portion 71 in the direction of the rotation axis L. According to the above configuration, the deformation that allows displacement of the outer diameter portion 71 and the inner diameter portion 72 of the retaining plate 7 in the direction of the rotation axis L can be controlled by the elastic deformation portions 73. In other words, the force that maintains the position of the friction member 4 in the direction of the rotation axis L can be controlled by the bendability of the elastic deformation portions 73. The force that maintains the position of the friction member 4 in the direction of the rotation axis L differs depending on the application, but this force can easily be adjusted during design using the bendability of the elastic deformation portions 73 as an index.

[0028] Although the embodiments of the present invention have been described above, it goes without saying that the technical scope of the present invention should not be construed as being limited by the description of the present embodiments. The present embodiments are merely examples, and those skilled in the art will understand that various modifications of the embodiments are possible within the scope of the invention as defined by the claims. Specifically, the present embodiments have been described as an example of a non-excitation actuated electromagnetic brake that operates by the force of a spring when de-energized, but an excitation actuated electromagnetic brake that operates by the electromagnetic force of an electromagnet when energized may also be used. The technical scope of the present invention should be determined based on the scope of the invention as defined by the claims and their equivalents. [Explanation of symbols]

[0029] 1. Housing 2 Rotating shaft 3. Hub 4 Friction members 5 Elastic member 6. Electromagnets 7 Holding plate 8 Crimping Pins 11 Contact part 12 Side Plate 13 Armature 14 York 31 Flange 32 Main body 41 Plate-shaped part 42 Friction part 41a inner diameter 41b Outer diameter 71 Outer diameter part 72 Inner diameter 73 Elastic deformation part 74 Crimp pin insertion hole 75 Hole

Claims

1. An electromagnetic brake device for a motor, a housing that rotatably accommodates a rotary shaft of the motor; a hub attached to the outer periphery of the rotary shaft; a friction member rotatable together with the hub and movable in the direction of the rotation axis; Equipped with The friction member has a plate-shaped portion and a friction portion provided radially outward of the plate-shaped portion, a pair of retaining plates that cover at least a portion of the friction member are provided on both sides of the hub in the direction of the rotation axis, The inner diameter portions of the pair of retaining plates are fixed to the hub, outer diameter portions of the pair of holding plates sandwich the friction member, elastically support the friction member in the direction of the rotation axis, and the holding plates are in surface contact with the friction member, each of the pair of holding plates has the inner diameter portion, an outer diameter portion, and an elastic deformation portion connecting the inner diameter portion and the outer diameter portion in the direction of the rotation axis; the elastic deformation portions of the pair of holding plates are bent so as to approach each other in a direction of the rotation axis from an inner diameter side to an outer diameter side, The elastic deformation portion has a plurality of through holes arranged circumferentially and penetrating in the direction of the rotation axis. Electromagnetic brake device for a motor.

2. an elastic member that brings the friction member into contact with or separates the contact portion of the housing; an electromagnet that separates the friction member from the contact portion when the elastic member brings the friction member into contact with the contact portion, and that brings the friction member into contact with the contact portion when the elastic member separates the friction member from the contact portion; The electromagnetic brake device for a motor according to claim 1 , further comprising:

3. 3. The electromagnetic brake device for a motor according to claim 1, wherein the outer diameter portions of the pair of holding plates are provided along the friction members.

4. 4. The electromagnetic brake device for a motor according to claim 1, wherein the inner diameter portions of the pair of holding plates are fixed to the hub with caulking pins.

5. 5. The electromagnetic brake device for a motor according to claim 1, wherein the outer diameter portions of the pair of holding plates sandwich the friction member therebetween over the entire periphery.

6. The crimping pin has a plurality of crimping pins, 5. The electromagnetic brake device for a motor according to claim 4, wherein the plurality of caulking pins are equally arranged concentrically.

7. 7. The electromagnetic brake device for a motor according to claim 1, wherein each of the pair of holding plates is a metal disk having a circular cutout therein.

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