JP2013190085A - Electromagnetic brake device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an electromagnetic brake device capable of preventing a friction material from wearing early and noise from being generated by allowing the friction member mounted to both sides of a rotating member to separate from a brake member when the rotating member rotates.SOLUTION: An electromagnetic brake device includes: a spline boss mounted to a rotating shaft so that the spline boss rotates integrally with the rotating shaft whose rotation axis center is provided vertically; a disk having friction materials attached to both surfaces thereof, engaged with the spline boss to rotate, and movable in the axial direction of the rotating shaft; a side plate provided on the upper side of the disk; an armature provided on the lower side of the disk so that the armature can move to and from the disk; a spring for braking the armature by biasing the armature toward the disk; an electromagnet for attracting the armature against the spring; and a ball rotatably provided on the armature to support the lower surface of the disk so that the friction member does not make contact with the side plate and the armature when the electromagnet attracts the armature.

Description

The present invention relates to an electromagnetic brake device.

In the electromagnetic brake device, a friction material is attached to both surfaces, and a braking member is pressed from both sides to a rotating member that rotates integrally with the rotating shaft to brake the rotating shaft. A spline boss is attached to the rotating shaft, and a spline portion is provided on the inner peripheral portion of the rotating member so as to engage with the spline boss, and the rotating member is movable in the axial direction of the rotating shaft. . One brake member is fixed, and the other movable brake member is urged toward the rotating member to perform braking. In addition, when the movable braking member is attracted by the electromagnet and separated from the rotating member to release the brake, the rotating shaft and the rotating member can be rotated.

By the way, since the rotating member is movable in the axial direction of the rotating shaft, the friction material may rub against the braking member while the rotating member is rotating, and noise and premature wear of the friction material may occur. In order to prevent this, a member is provided so that the spline boss and the rotating member engage with each other to restrict the movement of the rotating member in the axial direction so that the friction material does not rub against the braking member.
(For example, see Patent Document 1)

JP-A-11-210784 (FIG. 2)

However, since the spline boss and the rotating member are engaged, if the position of the spline boss attached to the rotating shaft is shifted, the position of the rotating member is also shifted together. Further, since the spline boss and the rotating member are engaged in a spline structure, there is a backlash, and the rotating member may be inclined with respect to the axial direction of the rotating shaft. For this reason, the friction material may rub against the braking member while the rotation member is rotating, and noise and premature wear of the friction material may occur.

The present invention has been made to solve such a problem, and can prevent noise and premature wear of the friction material by allowing the friction material attached to both surfaces of the rotation member to move away from the braking member while the rotation member is rotating. The object is to obtain an electromagnetic brake device.

The electromagnetic brake device according to the present invention includes a cylindrical spline boss that is attached to an outer peripheral portion of a rotating shaft so as to be rotatable integrally with a rotating shaft that is provided so that a rotating shaft is in an up-down direction, and friction materials on both sides. A disc-shaped rotating member that is engaged with the spline boss and rotates in conjunction with the rotating shaft and is movable in the axial direction of the rotating shaft; A fixed braking member provided facing the upper surface, a movable braking member provided facing the lower surface of the rotating member and capable of moving forward and backward, and the movable braking member biased toward the rotating member A biasing means that brakes the rotating member and the rotating shaft by sandwiching the friction material between the fixed braking member and the movable braking member, an electromagnet that attracts the movable braking member against the biasing means, and the electromagnet is the movable braking member When sucking As wood is not in contact with the fixed braking member and the movable brake member, and a, a support means provided on the movable braking member so as to support the lower surface of the rotary member.

According to the present invention, the rotating member is urged by the urging means via the movable braking member toward the fixed braking member provided facing the upper surface of the rotating member. When the electromagnet attracts the movable braking member against the biasing means, the rotating member can move in the axial direction of the rotating shaft, and therefore moves toward the movable braking member. For this reason, the friction material is separated from the fixed braking member. Furthermore, the lower surface of the rotating member is supported by support means provided on the movable braking member so that the friction material does not come into contact with the fixed braking member and the movable braking member. As a result, the friction material attached to both surfaces of the rotation member while the rotation member is rotating is separated from the fixed brake member and the movable brake member, so that noise and premature wear of the friction material can be prevented.

ADVANTAGE OF THE INVENTION According to this invention, the electromagnetic brake apparatus which can prevent noise and the early wear of a friction material can be obtained by making the friction material attached to both surfaces of the rotation member separate from a braking member while a rotation member rotates.

It is sectional drawing of the whole braking state of the electromagnetic brake device by Embodiment 1 of this invention. 1 is an overall cross-sectional view of an electromagnetic brake device according to a first embodiment of the present invention in a released state. It is sectional drawing of the whole release state of the electromagnetic brake device by Embodiment 2 of this invention. It is a figure which shows arrangement | positioning of a ball | bowl by arrow AA shown in FIG. It is a figure which shows arrangement | positioning of the ball | bowl by other embodiment of this invention.

Embodiment 1 FIG.
An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an overall cross-sectional view of a braking state of an electromagnetic brake device according to Embodiment 1 of the present invention. FIG. 2 is an overall cross-sectional view of the electromagnetic brake device in the released state according to the first embodiment of the present invention. FIG. 4 is a view showing the arrangement of the balls in the direction of arrows AA shown in FIG.

In FIG. 1, the rotation shaft 3 is provided so that the rotation axis of the electromagnetic brake device 1 is in the vertical direction. A cylindrical spline boss 4 is attached to the outer peripheral portion of the rotating shaft 3. A disc-shaped disk 5 is provided on the outer peripheral side of the spline boss 4, and friction materials 7 a and 7 b are fixed to the edges of the upper surface 5 a and the lower surface 5 b of the disk 5. And the spline part provided in the inner peripheral part of the disk 5 is engaged with the spline boss 4, and when the rotating shaft 3 and the spline boss 4 rotate together, the disk 5 also rotates together. Further, the disc 5 engaged with the spline boss 4 by the spline structure can move in the direction of the rotation axis.

A side plate 9 is provided so as to face the upper surface 5 a of the disk 5, and an armature 11 is provided so as to face the lower surface 5 b of the disk 5. Further, a field 13 constituting an electromagnet 14 is fixed to the attachment portion 12 below the armature 11. Three stud bolts 15 are provided at the edge of the field 13 so as to protrude toward the side plate 9, and are sandwiched between two nuts 17 a and 17 b at the threaded portion 15 a at the tip of each stud bolt 15. As shown, the side plate 9 is fixed. In addition, a recess 11a that engages with the root portion 15b of the stud bolt 15 is provided at the edge of the armature 11, so that the armature 11 can move in the direction of the rotation axis, but the rotation shaft 3 It does not rotate in the direction of rotation.

An electromagnetic coil 19 is embedded in the field 13 facing the armature 11, and the field 13 and the electromagnetic coil 19 constitute an electromagnet 14. Further, a hole 13a for inserting a spring 21 as an urging means for urging the armature 11 toward the disk 5 is provided at a portion of the field 13 facing the armature 11. The spring 21 has a proximal end inserted into the hole 13 a and a distal end abutted against the armature 11. The armature 11 presses against the friction material 7 b on the lower surface 5 b of the disk 5, and the friction material 7 a on the upper surface 5 a of the disk 5 presses against the side plate 9. Thereby, the disk 5 and the rotating shaft 3 are braked.

The disk 5 support means will be described. A hole 11 b into which a spring 27 for urging the ball 25 toward the disk 5 through the spring receiver 23 is inserted in the portion of the armature 11 facing the disk 5. The spring 27 has a proximal end inserted into the hole 11 b and a distal end abutted against the spring receiver 23. A lid 29 is provided at the opening of the hole 11b, and a hole of a size that allows the ball 25 to pass but not the spring receiver 23 is formed at the center of the lid 29. The ball 25 is rotatably held by a spring receiver 23.

In the state where the armature 11 is pressed against the friction material 7b and brakes as shown in FIG. 1, the ball 25 is in contact with the lower surface 5b of the disk 5 and is pushed into the hole 11b. Further, as shown in FIG. 4, these disk 5 support means are provided, for example, at three locations around the rotation shaft 3. The spring force of the spring 21 is set such that the side plate 9 and the armature 11, the friction material 7a, and the friction material 7b are pressed against the spring force of the spring 27 and the disk 5 and the rotating shaft 3 can be braked.

As shown in FIG. 2, when the armature 11 is attracted to the electromagnetic coil 19 side and is in contact with the field 13, the ball 25 pushed into the hole 11b is moved to the disk 5 side by the restoring force of the spring 27. Moving. The disk 5 is supported by the ball 25 on the lower surface 5 b so that the friction material 7 b on the lower surface 5 b of the disk 5 does not contact the armature 11. The ball 25 moves to the disk 5 side together with the spring receiver 23, but the amount of movement of the ball 25 is restricted when the spring receiver 23 hits the lid 29, and the friction material 7 a on the upper surface 5 a of the disk 5 does not contact the side plate 9. It is like that. When the rotating shaft 3 rotates in this state, the ball 25 is also supported while the disk 5 is supported.

The operation of the electromagnetic brake device 1 configured as described above will be described. When the current to the electromagnetic coil 19 is interrupted, the electromagnetic coil 19 is demagnetized, and the armature 11 is biased toward the disk 5 by the biasing force of the spring 21. The armature 11 presses against the friction material 7 b on the lower surface 5 b of the disk 5, and the friction material 7 a on the upper surface 5 a of the disk 5 contacts the side plate 9. Thereby, the disk 5 and the rotating shaft 3 are braked.

Next, when a current is supplied from a power source (not shown) to the electromagnetic coil 19 and the electromagnetic coil 19 is excited, the armature 11 is attracted to the electromagnetic coil 19 side against the biasing force of the spring 21 and is applied to the field 13. Abut. As the armature 11 moves to the electromagnetic coil 19 side, that is, to the lower side, the disk 5 also moves to the lower side. On the other hand, the ball 25 held rotatably on the spring receiver 23 is pushed out from the hole 11 b of the armature 11 to the place where the spring receiver 23 hits the lid 29 by the restoring force of the spring 27, and indicates the lower surface 5 b of the disk 5. As a result, while the disk 5 is rotating, the friction material 7a and the friction material 7b attached to both surfaces of the disk 5 are separated from the armature 11 and the side plate 9, so that noise and the friction material 7a and the friction material 7b are worn early. Can be prevented.

In this embodiment, the case where three balls 25 supporting the disk 5 are provided around the rotary shaft 3 has been described. However, as shown in FIG. Further, six balls 25 may be provided on the outer peripheral side of the friction material 7b.

Embodiment 2. FIG.
A second embodiment of the present invention will be described with reference to FIG. FIG. 3 is an overall cross-sectional view of the electromagnetic brake device according to the second embodiment of the present invention in a released state. Note that components having the same reference numerals as those in the other embodiments show the same parts in the present embodiment, and description thereof is omitted.

In FIG. 3, in Embodiment 1, the rotation shaft 3 is provided so that the rotation axis is in the vertical direction, whereas in this embodiment, the rotation axis of the rotation shaft 3 is in the substantially horizontal direction. Thus, the entire electromagnetic brake device 2 is provided. Therefore, the friction material 8a and the friction material 8b are fixed to the left surface 6a and the right surface 6b of the disk 6, respectively. The disk 6 support means is supported from the right surface 6b of the disk 6 by a ball 25 as a first support member, as in the first embodiment.

A hole 30 a for inserting a spring 37 that biases the ball 35 as the second support member toward the disk 6 through a spring receiver 33 is provided in a portion of the side plate 30 facing the disk 6. The spring 37 has a proximal end inserted into the hole 30 a and a distal end abutted against the spring receiver 33. A lid 39 is provided at the opening of the hole 30a, and a hole is formed in the central portion of the lid 39 so that the ball 35 can pass but the spring receiver 33 cannot pass. The ball 35 is rotatably held by a spring receiver 33. These disk 6 support means are provided, for example, at three locations around the rotation shaft 3.

The disc 6 is supported by the ball 35 on the left surface 6 a so that the friction material 8 a on the left surface 6 a of the disc 6 does not contact the side plate 30. The ball 35 moves to the disk 6 side together with the spring receiver 33. However, the amount of movement of the ball 35 is restricted when the spring receiver 33 hits the lid 39 so that the friction material 8b on the right surface 6b of the disk 6 does not contact the armature 11. It is. When the rotating shaft 3 rotates in this state, the disk 6 is supported while the ball 35 rotates. The spring force of the spring 27 and the spring force of the spring 37 are approximately the same magnitude. The spring force of the spring 21 is such that the armature 11, the side plate 30, the friction material 8 a, and the friction material 8 b are pressed against the spring force of the spring 27 and the spring 37 to brake the disk 6 and the rotating shaft 3. It is.

The operation of the electromagnetic brake device 2 configured as described above will be described. When the current to the electromagnetic coil 19 is interrupted, the electromagnetic coil 19 is demagnetized, and the armature 11 is biased toward the disk 6 by the biasing force of the spring 21. The armature 11 presses against the friction material 8 b on the right surface 6 b of the disk 6, and the friction material 8 a on the left surface 6 a of the disk 6 presses against the side plate 30. Thereby, the disk 6 and the rotating shaft 3 are braked. At this time, the ball 25 contacts the right surface 6b of the disc 6 and is pushed into the hole 11b, and the ball 35 contacts the left surface 6a of the disc 6 and is pushed into the hole 30a.

Next, when a current is supplied from a power source (not shown) to the electromagnetic coil 19 and the electromagnetic coil 19 is excited, the armature 11 is attracted to the electromagnetic coil 19 side against the biasing force of the spring 21 and is applied to the field 13. Abut. As the armature 11 moves to the electromagnetic coil 19 side, that is, to the right side, the ball 25 held rotatably by the spring receiver 23 hits the lid 29 by the restoring force of the spring 27 from the hole 11b of the armature 11. It is pushed out so far and the right side 6b of the disk 6 is indicated.

Further, the ball 35 rotatably held by the spring receiver 33 is pushed out from the hole 30a of the side plate 30 to a position where the spring receiver 33 hits the lid 39 by the restoring force of the spring 37, and indicates the left surface 6a of the disk 6. As a result, while the disk 6 is rotating, the friction material 8a and the friction material 8b attached to both surfaces of the disk 6 are separated from the side plate 30 and the armature 11, so that the noise and the friction material 8a and the friction material 8b are prematurely worn. Can be prevented.

1, 2 Electromagnetic brake device, 3 Rotating shaft, 4 Spline boss, 5, 6 Disc, 5a Upper surface, 5b Lower surface, 6a Left surface, 6b Right surface,
7a, 7b, 8a, 8b Friction material, 9, 30 Side plate, 11 Armature, 13 Field, 14 Electromagnet, 19 Electromagnetic coil, 21, 27, 37 Spring, 23, 33 Spring receiver, 25, 35 Ball, 29, 39 lid

Claims (4)

A cylindrical spline boss attached to an outer peripheral portion of the rotary shaft so as to be rotatable integrally with a rotary shaft provided so that the rotary shaft is in the vertical direction;
A friction material is attached to both surfaces, and a spline portion provided on an inner peripheral portion is engaged with the spline boss, rotates in conjunction with the rotation shaft, and is movable in the axial direction of the rotation shaft. A rotating member;
A fixed braking member provided facing the upper surface of the rotating member;
A movable braking member that faces the lower surface of the rotating member and is provided so as to be able to advance and retract toward the rotating member;
Urging means for urging the rotating member and the rotating shaft by urging the movable braking member toward the rotating member and sandwiching the friction material between the fixed braking member and the movable braking member;
An electromagnet for attracting the movable braking member against the biasing means;
When the electromagnet is attracting the movable brake member, the movable brake member is provided to support the lower surface of the rotating member so that the friction material does not contact the fixed brake member and the movable brake member. Supported means,
An electromagnetic brake device comprising: The support means includes a support member that can rotate in conjunction with rotation of the rotating member,
2. The electromagnetic brake device according to claim 1, wherein the lower surface of the rotating member is supported at least at three locations by the support member. A cylindrical spline boss attached to the outer periphery of the rotary shaft so as to be rotatable integrally with a rotary shaft provided so that the rotary shaft is substantially horizontal;
A friction material is attached to both surfaces, and a spline portion provided on an inner peripheral portion is engaged with the spline boss, rotates in conjunction with the rotation shaft, and is movable in the axial direction of the rotation shaft. A rotating member;
A fixed braking member provided facing one surface of the rotating member;
A movable braking member provided opposite to the other surface of the rotating member and capable of moving back and forth toward the rotating member;
Urging means for urging the rotating member and the rotating shaft by urging the movable braking member toward the rotating member and sandwiching the friction material between the fixed braking member and the movable braking member;
An electromagnet for attracting the movable braking member against the biasing means;
When the electromagnet is attracting the movable brake member, the fixed brake member is provided on the fixed brake member so as to support one surface of the rotating member so that the friction material does not contact the fixed brake member. A support means,
When the electromagnet is attracting the movable brake member, the movable brake member is provided on the movable brake member so as to support the other surface of the rotating member so that the friction material does not contact the movable brake member. Two support means;
An electromagnetic brake device comprising: The first support means includes a first support member that can rotate in conjunction with rotation of the rotating member,
One surface of the rotating member is supported at least in three places by the first supporting member,
The second support means includes a second support member that can rotate in conjunction with rotation of the rotating member,
4. The electromagnetic brake device according to claim 3, wherein the other surface of the rotating member is supported at least at three locations by the second support member. 5.

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