JP5878755B2 - Brake device - Google Patents

Description

  The present invention relates to a brake device for braking a rotating shaft, for example, a brake device for braking an output shaft of a motor provided in an industrial robot or the like.

  The industrial robot is configured by connecting a plurality of arms via joints, and an end effector is provided on the arm located at the most distal end. The arms connected via the joints rotate relative to each other, and the end effector can be moved in various directions by rotating the arms. The industrial robot configured as described above includes a drive motor to relatively rotate the arm. This drive motor has an output shaft connected to the arm via a gear train, and is configured to rotate the arm relative to each other by rotating the output shaft. The drive motor configured as described above is provided with a brake device and brakes an output shaft that is rotated by the brake device. As a brake device, for example, a shaft brake device described in Patent Document 1 is known.

  The saddle shaft brake device described in Patent Document 1 has a vertical shaft that is an output shaft, and a friction plate is provided on the vertical shaft. The friction plate is disposed between the brake plate and the armature, and is configured to be movable between them. The armature is biased by a spring, and the friction plate is pressed against the braking plate by being biased. By pressing the friction plate against the braking plate in this way, a frictional force is generated in the friction plate and the vertical axis is braked.

  The shaft brake device includes an electromagnet. The electromagnet is configured to apply an electromagnetic force corresponding to the supplied power to the armature against the biasing force of the spring, and the armature to which the electromagnetic force is applied moves away from the friction plate so as to release the braking. It has become. Further, in the shaft brake device, when releasing the braking, the armature is dropped toward the electromagnet together with the armature by its own weight, and has a separating means for separating the falling armature and the friction plate.

Japanese Patent Laid-Open No. 6-143079

  In Patent Document 1, it is assumed that a drive motor provided with a shaft brake device is fixed to a base or the like. However, in an industrial robot, the arms rotate relative to each other to assume various postures, so that the posture of the drive motor provided on the arms is not necessarily constant. Therefore, the friction plate may be positioned horizontally with respect to the brake plate or may be positioned on the upper side. When braking is released in such a state, the friction plate does not move away from the braking plate or moves toward the braking plate, and the braking plate comes into contact with the rotating friction plate. As a result, the braking plate and the friction plate rub against each other, and heat is generated by this friction to adversely affect the surroundings or the friction plate is consumed at an early stage.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a brake device that has little adverse effect on the periphery due to frictional heat and has a long friction plate life even when the posture of the brake device changes.

  The brake device according to the present invention includes a rotating shaft provided in a casing so as to be rotatable around an axis, and the relative displacement around the axis is restricted with respect to the rotating shaft and is relatively displaceable in the axial direction. A friction plate provided on a rotating shaft; a brake plate disposed so as to face the friction plate in the axial direction; and the brake plate and the axial direction opposite to the friction plate. An armature that is opposed to the friction plate in the axial direction and is displaceable in the axial direction, and urges the armature toward the braking plate to sandwich the friction plate between the armature and the braking plate. An urging mechanism, an electromagnetic drive mechanism that applies an electromagnetic force against the urging force of the urging mechanism to the armature to separate the armature from the friction plate, and both sides of the friction plate in the axial direction. A pair of restrictions that restrict movement of the friction plate in the axial direction so that the friction plate does not hit the armature and the brake plate when the armature is separated from the friction plate by the electromagnetic drive mechanism And a member.

  According to the present invention, the friction plate can be relatively displaced in the axial direction in the brake release state in which the armature is separated from the friction plate by the electromagnetic drive mechanism. As a result, the position of the brake device may change and the friction plate may move toward the armature or the braking plate. Are regulated by a pair of regulating members. Therefore, it is possible to prevent the rotating friction plate from being worn against the armature and the braking plate and generating frictional heat. As a result, even if the posture of the brake device changes, adverse effects on the periphery due to frictional heat can be reduced, and the life of the friction plate can be extended.

  In the above invention, the first regulating member located on the brake plate side of the pair of regulating members pushes the friction plate toward the armature when the armature is separated from the friction plate by the electromagnetic drive mechanism. It is preferable to be separated from the brake plate.

  According to the above configuration, since the friction plate is separated from the brake plate when the brake is released, the friction plate rotates and the friction plate wears while the brake plate is in contact with the friction plate in the brake release state. Can be prevented.

  In the above invention, the first restricting member is provided in the armature, and has an overhang portion extending from the armature so as to bypass the outer periphery of the friction plate and overhang to the brake plate side, It is preferable that the 2nd control member located in the said armature side is provided in the said casing among a pair of said control members.

  If the said structure is followed, it is not necessary to provide the drive mechanism for driving a 1st control member newly, and can reduce a number of parts.

  In the above invention, the pair of restricting members each have a slip portion made of a low friction material at a portion facing the friction plate and restricting the relative displacement in the axial direction of the friction plate, and the pair of slip portions are When the friction plate is regulated, it is preferable that the friction plate is separated from the axial thickness of the friction plate.

  According to the above configuration, it is possible to prevent both of the pair of regulating members from hitting the rotating friction plates during regulation, that is, in the brake release state. Thereby, abrasion of the rotating friction plate can be suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, even if it is a case where the attitude | position of a brake device changes, there is little bad influence on the periphery by frictional heat, and a brake device with a long lifetime of a friction board can be provided.

It is sectional drawing which shows the brake device which concerns on embodiment of this invention. It is a top view which shows the brake device of FIG. It is sectional drawing which cut | disconnects and shows the brake device of FIG. It is sectional drawing which shows a time when the brake device of FIG.

  Below, the brake device 1 of embodiment of this invention is demonstrated, referring drawings mentioned above. The concept of direction used in the following description is used for convenience of description, and is not necessarily limited to that direction. Furthermore, the brake device described below is only one embodiment of the present invention. Therefore, the present invention is not limited to the embodiments, and can be added, deleted, or changed without departing from the spirit of the invention.

<Brake device>
The industrial robot is configured by connecting a plurality of arms via joints, and the arms rotate relative to each other. The industrial robot includes a drive motor for rotating the arm relatively. The drive motor has an output shaft connected to the arm via a gear train, and rotates the output shaft of the drive motor. The arm is relatively rotated. The drive motor configured as described above is provided with a brake device 1 as shown in FIG. 1, and brakes an output shaft that is rotated by the brake device 1. 1 is a cross-sectional view taken along a cutting line II in FIG. 2 to be described later.

  The brake device 1 includes a brake casing 2 that is formed integrally with a motor casing of a drive motor. The brake casing 2 is formed in a substantially bottomed cylindrical shape, and a tip end portion of the rotary shaft 3 is rotatably provided on the bottom portion via a bearing 4.

[Rotating shaft and friction plate]
The rotating shaft 3 is an output shaft of the drive motor, and is formed in a substantially cylindrical shape. The rotating shaft 3 is configured to be rotatable around its axis L1, and a friction plate 5 is provided at an intermediate portion in the axial direction. The friction plate 5 is formed in a substantially disc shape, and the rotation shaft 3 is provided on the friction plate 5 so as to penetrate the center of the friction plate 5. The rotating shaft 3 and the friction plate 5 are spline-coupled, and the friction plate 5 is configured to be relatively displaceable in the axial direction with respect to the rotating shaft 3. Further, the friction plate 5 is configured to rotate together with the rotating shaft 3 by restricting relative displacement around the rotating shaft 3 with respect to the rotating shaft 3 by spline coupling. The armature 6 and the brake plate 7 are arranged on both sides in the axial direction with respect to the friction plate 5 thus configured so as to sandwich the friction plate 5.

[Armature]
The armature 6 is a substantially annular member made of a magnetic material and has a larger diameter than the friction plate 5. The armature 6 has a through hole 6 a at the center thereof, and the diameter of the through hole 6 a is larger than the outer diameter of the rotating shaft 3. The armature 6 is disposed on one side in the axial direction with respect to the friction plate 5 with the rotary shaft 3 inserted through the through hole 6a. In the armature 6 arranged in this way, the pressing surface 6b on the other side in the axial direction faces the friction plate 5, and the suction surface 6c on the one side in the axial direction opposite to the friction plate 5 faces the fixed casing 8. doing.

[Fixed casing]
The fixed casing 8 is a substantially cylindrical casing, and is fixed to the bottom of the brake casing 2 by inserting the rotary shaft 3 through the inner hole thereof. The fixed casing 8 fixed in this way has one end in the axial direction fixed to the bottom of the brake casing 2 and the other end in the axial direction opposed to the armature 6 by a distance L in the axial direction. A plurality of spring holes 8 a are formed at the other axial end of the fixed casing 8. The plurality of spring holes 8a are formed at substantially equal intervals in the circumferential direction in the radially intermediate portion, and a spring member 9 is provided in each spring hole 8a. The spring member 9 that is an urging mechanism is a so-called compression coil spring, and abuts against the adsorption surface 6 c of the armature 6 to urge the armature 6 toward the friction plate 5.

  The fixed casing 8 has a coil housing space 8b. The coil housing space 8b is a substantially cylindrical space, is located radially inward of the plurality of spring holes 8a, and is formed so as to be surrounded from the radially outer side of the inner hole of the fixed casing 8. In the coil housing space 8b, a coil 11 formed in a substantially cylindrical shape is housed. The coil 11 serving as an electromagnetic drive mechanism is configured by winding a coil wire around a bobbin several times. When a current is supplied from a controller (not shown), the coil 11 is electromagnetic in a direction that resists the biasing force of the spring members 9. It is designed to generate power. That is, the coil 11 generates an electromagnetic force that attracts the armature 6 made of a magnetic material away from the friction plate 5 toward the fixed casing 8.

  Furthermore, a plurality of spacers 12 are erected on the outer peripheral edge of the other end of the fixed casing 8 in the axial direction. The spacer 12 is a substantially cylindrical sleeve, and is disposed on the other axial end portion of the fixed casing 8 with an interval in the circumferential direction. The spacer 12 extends parallel to the axis L <b> 1 of the rotating shaft 3 and penetrates the armature 6. The outer diameter of the spacer 12 is set so that a gap is formed between the spacer 12 and the armature 6. Accordingly, the armature 6 can move in the axial direction, and the spacer 12 serves as a guide member for guiding the armature 6 in the axial direction. A brake plate 7 is disposed at the end of the spacer 12 on the other side in the axial direction.

[Brake plate]
The brake plate 7 is a substantially annular member, and has a through hole 7a at the center thereof. The hole diameter of the through hole 7 a is formed larger than the outer diameter of the rotating shaft 3. The brake plate 7 has the rotation shaft 3 inserted through the through hole 7 a and is disposed on the other side in the axial direction with respect to the friction plate 5. The braking plate 7 arranged in this way has a braking surface 7 b on one side in the axial direction facing the friction plate 5, and is supported by an end portion on the other side in the axial direction of the plurality of spacers 12. Further, a fastening hole 7 c is formed in the brake plate 7 at a position where the spacer 12 is disposed, and the fastening hole 7 c is connected to the inner hole of the spacer 12. A fastening member 13 such as a bolt is inserted through the fastening hole 7c. The fastening member 13 is inserted into the fastening hole 7 c and the inner hole of the spacer 12, and the tip portion reaches the fixed casing 8 and is screwed there. The fastening member 13 has a head portion 13a at the base end portion, and the head portion 13a is configured to have a larger diameter than the remaining portion. The head portion 13 a protrudes from the braking plate 7 to the other side in the axial direction and abuts on a fastening surface 7 e that is a surface on the other side in the axial direction of the braking plate 7. As a result, the brake plate 7 and the spacer 12 are sandwiched between the head 13 a and the fixed casing 8, and the brake plate 7 is fixed to the fixed casing 8.

  In the brake device 1 configured as described above, the armature 6 is biased by the spring member 9, and the biased armature 6 moves the friction plate 5 to the braking plate in a non-operating state where no current flows through the coil 11. The friction plate 5 is clamped together with the brake plate 7 by pressing against the brake plate 7. As a result, the friction plate 5 does not rotate, and the rotating shaft 3 splined to the friction plate 5 also does not rotate. When a current flows through the coil 11 from such a non-operating state, an electromagnetic force that resists the biasing force of the spring member 9 acts on the armature 6 from the coil 11, and the armature 6 moves away from the friction plate 5. As a result, the braking force no longer acts on the friction plate 5, and the rotating shaft 3 rotates by the rotational force of the drive motor. The armature 6 away from the friction plate 5 moves toward the fixed casing 8 while being guided by the spacer 12, and the suction surface 6 c eventually comes into contact with the other axial end of the fixed casing 8. In this manner, the armature 6 is separated from the friction plate 5 by passing a current through the coil 11, and the brake device 1 does not act on the friction plate 5 from the braking state where the braking force acts on the friction plate 5 (that is, The brake is released.

  Further, when the current flowing through the coil 11 is stopped in the brake release state, the electromagnetic force acting on the armature 6 is lost and the spring member 9 cannot be opposed. As a result, the armature 8 attracted by the coil 11 is urged by the spring member 9 and moves toward the friction plate 5, and the friction plate 5 is pressed against the brake plate 7 again by the armature 6. As a result, a braking force acts on the friction plate 5, the brake device 1 returns to the braking state, and the rotating shaft 3 is braked.

  In the brake device 1 that operates in this way, the braking state and the braking release state are instantaneously switched according to the presence or absence of a current flowing through the coil 11. In the present embodiment, the configuration is as described above. However, the value of the current flowing through the coil 11 may be adjustable so that the braking force of the brake device 1 can be adjusted.

  In the brake device 1 configured as described above, since the armature 6 is separated from the friction plate 5 in the brake released state, the friction plate 5 can move along the rotation shaft 3 toward the armature 6 and the brake plate 7. It has become. Therefore, the brake device 1 has a pair of regulating members 21 and 22 that regulate the movement of the friction plate 5 so that the rotating friction plate 5 does not contact the armature 6 and the brake plate 7. Hereinafter, the configuration of the pair of regulating members 21 and 22 will be described in detail.

[Regulatory members]
As shown in FIG. 4, the pair of restricting members 21 and 22 includes a first restricting member 21 provided on the armature 6 and a second restricting member 22 provided on the fixed casing 8. The armature 6 is provided with a plurality of first restricting members 21. In the present embodiment, as shown in FIG. 2, eight first restricting members 21 are provided on the armature 6. Moreover, the 1st control member 21 comprises 2 sets, and is provided in the armature 6 1 set every 90 degree | times in the circumferential direction centering on the axis line L1. And the two 1st control members 21 which comprise each group are arrange | positioned on the pressing surface 6b of the armature 6 so that it may adjoin to the said circumferential direction.

  The first regulating member 21 arranged in this way has an overhang portion 23 of a rigid member. As shown in FIG. 3, the overhang portion 23 is provided with a plurality of overhang portions 23 on the outer peripheral edge portion on the pressing surface 6 b side of the armature 6. The overhang portion 23 extends from the armature 6 so as to bypass the outer periphery of the friction plate 5 and overhang toward the brake plate 7 side.

  More specifically, the overhang portion 23 has a standing portion 23 a and a mounting portion 23 b, and the standing portion 23 a is provided on the outer peripheral edge portion of the armature 6. The standing portion 23 a rises from the armature 6 in one axial direction, and the tip portion reaches the radially outer side of the brake plate 7. The brake plate 7 has a notch 7d at a position corresponding to the standing portion 23a on the outer peripheral portion thereof, specifically, a position overlapping the standing portion 23a when viewed from the outside in the radial direction. The notch portion 7d is a portion of the outer periphery of the brake plate 7 that is notched radially inward with respect to the remaining portion, and the outer peripheral edge of the surface of the friction plate 5 on the brake plate 7 side is on the other side in the axial direction. The brake plate 7 is formed so as to be exposed. The standing portion 23a is positioned so as to face the notched portion 7d formed as described above, and a mounting portion 23b is integrally provided at the tip of the standing portion 23a.

  The attachment portion 23b extends radially inward from the standing portion 23a, and a tip portion thereof reaches the notch portion 7d and is positioned on the outer peripheral edge portion of the friction plate 5. A slip portion 24 is provided on the surface on the friction plate 5 side at the tip of the mounting portion 23b, and the slide portion 24 is arranged so as to protrude toward the friction plate 5. The sliding portion 24 arranged in this way is a substantially disk-shaped member (for example, a thrust washer) made of a low friction material, and faces the outer peripheral edge of the surface of the friction plate 5 on the brake plate 7 side. Yes.

  Further, the armature 6 is formed with an insertion hole 6d at a position facing the slip portion 24 with the friction plate 5 interposed therebetween, and the fixed casing 8 is formed with a first position at a position facing the slip portion 24 with the friction plate 5 interposed. 2 Restriction member 22 is provided. The second restricting member 22 is provided in correspondence with the first restricting member 21, and the same number (eight in the present embodiment) of second restricting members 22 as the first restricting member 21 is provided in the fixed casing 8. It has been.

  The second restricting member 22 has a substantially cylindrical support member 25 that is a rigid member. The support member 25 is provided in the fixed casing 8. The support member 25 protrudes from the fixed casing 8 toward the friction plate 5 and is inserted through the insertion hole 6d. Further, a substantially disc-shaped slip portion 26 (for example, a thrust washer) made of a low friction material is provided at the tip portion of the support member 25, and this slip portion 26 is on the side of the armature 6 in the friction plate 5. Opposite the outer peripheral edge of the surface.

  In the pair of first restricting members 21 and 22 configured as described above, the slip portions 24 and 26 are positioned away from the friction plate 5 in one axial direction and the other in the braking state. More specifically, the sliding portion 24 of the first restricting member 21 is positioned on the other side in the axial direction from the braking surface 7b of the braking plate 7, and does not hit the friction plate 5 in the braking state. Further, the sliding portion 26 of the second restricting member 21 is located on one side in the axial direction with respect to the pressing surface 6b of the armature 6 so that it does not hit the friction plate 5 in the braking state.

  Further, when a current is passed through the coil 11 to release the brake device 1 and release the armature 6 from the friction plate 5, the first restricting member 21 moves in the axial direction together with the armature 6, and the sliding portion 24 is It approaches toward the friction plate 5. The sliding portion 24 that has approached eventually protrudes from the braking surface 7 b of the braking plate 7. At this time, if the friction plate 5 is swung toward the braking plate 7 due to its own weight or the like and is in contact with the braking surface 7b, the friction plate 5 is pushed by the sliding portion 24 and separated from the braking surface 7b. Thus, by separating the friction plate 5 from the braking surface 7b, it is possible to prevent the friction plate 5 from rotating and wearing while being in contact with the braking surface 7b.

  Further, by causing the sliding portion 24 to protrude from the braking surface 7b, even if the friction plate 5 separated from the braking surface 7b moves toward the braking surface 7b due to its own weight or the like, the friction plate 5 is moved to the sliding portion 24. The movement can be regulated by guessing. As a result, it is possible to prevent the rotating friction plate 5 from hitting against the brake plate 7 and being worn. The sliding portion 24 and the friction plate 5 are in contact with each other when the friction plate 5 is separated from the braking surface 7b. However, since the sliding portion 24 is made of a low friction material, wear of the friction plate 5 is suppressed. Can do.

  Further, by moving the armature 6 away from the friction plate 5, the armature 6 moves toward the fixed casing 8, and accordingly, the sliding portion 26 of the second restricting member 22 relatively moves through the insertion hole 6d. Then, almost simultaneously with the sliding portion 24 of the first regulating member 21 projecting from the braking surface 7b, the sliding portion 26 of the second regulating member 22 projects through the insertion hole 6d and projects from the pressing surface 6b toward the friction plate 5. . At this time, if the friction plate 5 is swung toward the armature 6 by its own weight or the like and is in contact with the pressing surface 6b, the friction plate 5 is pressed by the sliding portion 26 and separated from the pressing surface 6b. Thus, by separating the friction plate 5 from the pressing surface 6b, it is possible to prevent the friction plate 5 from rotating and wearing while being in contact with the pressing surface 6b.

  Further, by causing the sliding portion 26 to protrude from the pressing surface 6b, even if the friction plate 5 separated from the pressing surface 6b moves toward the pressing surface 6b due to its own weight or the like, the friction plate 5 is moved to the sliding portion 26. The movement can be regulated by guessing. Thereby, it can prevent that the friction plate 5 in rotation hits the armature 6 and is worn. The sliding portion 26 and the friction plate 5 are in contact with each other when the friction plate 5 is separated from the pressing surface 6b. However, since the sliding portion 26 is made of a low friction material, wear of the friction plate 5 is suppressed. Can do.

  In this way, the sliding portions 24 and 26 are arranged so as to face each other with the friction plate 5 interposed therebetween, and restrict the movement of the friction plate 5 toward the brake plate 7 and the armature 6 in the brake release state. . The distance T1 in the braking release state between the two sliding portions 24 and 26 thus regulated is larger than the thickness t in the axial direction of the friction plate 5. In other words, the distance T2 between the two sliding portions 24 and 26 in the braking state is larger than the length obtained by adding the distance L between the armature 6 and the fixed casing 8 to the thickness t in the axial direction of the friction plate 5. . With this configuration, it is possible to prevent the sliding portions 24 and 26 from both coming into contact with the friction plate 5 and wearing on both surfaces of the friction plate 5 when the brake is released. Thereby, the exchange period accompanying abrasion of the friction plate 5 can be lengthened.

  In the brake device 1 configured as described above, the friction plate 5 is splined to the rotating shaft 3, so that the friction plate 5 can be relatively displaced in the axial direction in the brake released state. The friction plate 5 may move toward the armature 6 or the brake plate 7 depending on the posture. However, since the pair of restricting members 21 and 22 restrict the movement of the friction plate 5 so that the friction plate 5 does not hit the armature 6 and the braking plate 7 in the brake release state, the rotating friction plate 5 is in contact with the armature 6. Further, it is possible to prevent the brake plate 7 from being worn away and generating frictional heat. Thereby, even if it is a case where the attitude | position of the brake device 1 changes, a bad influence can be reduced to the periphery by friction heat, and the lifetime of the friction board 5 can be lengthened.

  Further, in the brake device 1, the first restricting member 21 is provided integrally with the armature 6 so as to be interlocked. Therefore, it is not necessary to provide a drive mechanism for driving the first regulating member 21, and the number of parts can be reduced. Thereby, the manufacturing cost of the brake device 1 can be reduced.

<Brake device of other embodiment>
In the brake device 1 of the present embodiment, the first restricting member 21 is provided on the armature 6, but it is not necessarily provided on the armature 6 and may be configured separately. In this case, it is preferable to provide a configuration for driving in conjunction with the armature 6. Moreover, although the 2nd control member 22 is provided in the fixed casing 8, it does not necessarily need to be provided in the fixed casing 8, and may be provided in the brake plate 7. FIG. In this case, the second restricting member 22 may be formed in an overhang like the first restricting member 21. The pair of regulating members 21 and 22 are not necessarily arranged to face each other, and may be arranged at positions shifted from each other in the circumferential direction.

  In the brake device 1 of the present embodiment, the pair of regulating members 21 and 22 have the slip portions 24 and 26, but the slip portions may be formed toward the friction plate 5. In this case, an annular sliding member, for example, a thrust washer, is provided at a position where the pair of restricting members 21 and 23 of the friction plate 5 face each other, that is, on the outer peripheral edge portions of both surfaces of the friction plate 5. Moreover, the sliding part 26 of the 2nd control member 22 is not limited to disk shape, A ball shape may be sufficient. Moreover, the structure which presses the sliding part of a ball-type shape with the compression coil spring, and presses it against the friction board 5 may be sufficient. Furthermore, the pair of regulating members 21 and 22 is not limited to the shape as described above.

DESCRIPTION OF SYMBOLS 1 Brake device 3 Rotating shaft 5 Friction plate 6 Armature 7 Brake plate 8 Fixed casing 9 Spring member 21 First restriction member 22 Second restriction member 23 Overhang part 24 Slip part 26 Slip part

Claims (3)

A rotating shaft provided in the casing so as to be rotatable around an axis, and
A friction plate provided on the rotating shaft in a state in which relative displacement around the axis is restricted and is capable of relative displacement in the axial direction with respect to the rotating shaft;
A braking plate disposed to face the friction plate in the axial direction;
An armature that is located on the opposite side to the friction plate with respect to the friction plate, is opposed to the friction plate in the axial direction, and is displaceable in the axial direction;
An urging mechanism for urging the armature toward the brake plate to sandwich the friction plate between the armature and the brake plate;
An electromagnetic drive mechanism that applies an electromagnetic force against the urging force of the urging mechanism to the armature to separate the armature from the friction plate;
Provided on both sides of the friction plate in the axial direction, and when the armature is separated from the friction plate by the electromagnetic drive mechanism, the friction plate does not contact the armature and the brake plate. A pair of regulating members that regulate movement in the axial direction ,
Of the pair of restricting members, a first restricting member located on the brake plate side pushes the friction plate toward the armature when the armature is separated from the friction plate by the electromagnetic drive mechanism. that has become away, the brake system. The first restricting member is provided on the armature, and has an overhang portion extending from the armature so as to bypass the outer periphery of the friction plate and overhang to the brake plate side,
The second regulating member positioned on the armature side of the pair of restricting members are provided in the casing, the brake device according to claim 1. Each of the pair of restricting members has a sliding portion made of a low friction material at a portion that faces the friction plate and restricts the relative displacement in the axial direction of the friction plate.
The brake device according to claim 1 or 2 , wherein the pair of sliding portions are separated from an axial thickness of the friction plate when the friction plate is regulated.

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