JPH10141404A - Non-energized operation type electromagnetic brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-energized operation type electromagnetic brake which does not require the change of design of a motor and a machine frame side, can be assembled easily, and reduces a space required for assembling. SOLUTION: A brake hub 13 has a cylindrical part 13B which is fitted in a tip part of a motor shaft 6 and can be elastically deformed, and a coupling hub 14 on a drive side which is connected with a coupling hub 17 on a driven side is fitted in an outer peripheral face of the cylindrical part. A tightening part 14B in which a slit G in the radial direction is formed over a section between an outer peripheral face and an inner peripheral face of the coupling hub 14 on the drive side is provided in the coupling hub 14 on the drive side, and the coupling hub 14 on the drive side is fixed on the motor shaft together with the brake hub by tightening a tightening screw 15 which crosses these slits.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-excitation type electromagnetic brake which is released when power is supplied to a motor, and which brakes a motor shaft or a driven shaft connected to the motor shaft when the power supply to the motor is cut off. About.

[0002]

2. Description of the Related Art Conventionally, a non-excited operation type electromagnetic brake used for a servomotor or the like is configured such that an electromagnetic coil is excited just before energizing a motor to release braking of a motor shaft.
Immediately after the power supply to the motor is cut off, the power supply to the electromagnetic coil is cut off and the motor shaft is braked.

[0003] An example of a conventional non-excited operation type electromagnetic brake shown in FIG. 10 is a type built in a motor, in which an electromagnetic brake A2 is incorporated in a motor A1, and a motor shaft A
3 and the driven shaft A4 are connected by a shaft coupling A5.

A field A6 of the electromagnetic brake A2 is fixed to an inner surface of a motor flange A7 by a plurality of bolts A8, and a plate A9 is provided on a surface opposite to the facing surface of the motor flange A7 with a predetermined gap. It is attached by a plurality of attachment bolts A10 so as to face each other.

In the gap, an armature A11 is arranged adjacent to the field A6, and a friction plate A12 is arranged between the armature A11 and the plate A9.

The distance between the field A6 and the plate A9 is wider than the sum of the respective thicknesses of the armature A11 and the friction plate A12. The rotation of the friction plate A12 is restricted with respect to the motor shaft A3, and the friction in the axial direction. Is movably attached to.

Further, the armature A11 has a mounting bolt A
The rotation of the plate A9 is restricted by a compression coil spring (not shown) which is guided and supported so as to be able to move in the axial direction, and is elastically mounted between the plate A9 and the field A6.
When the motor A2 is stopped and the electromagnetic coil A13 built in A6 is not energized, the friction plate A12 is sandwiched between the armature A11 and the plate A9, and the frictional force is applied. By motor shaft A3
The rotation of is prevented.

When the motor A2 is energized and the electromagnetic coil A13 is energized at the same time as the field A2 is excited, the armature A11 is attracted to the field A2, the friction plate A12 is opened, and the motor shaft A3 rotates. Start. The rotation of the motor shaft A3 is transmitted to the driven shaft A4 via the shaft coupling A5.

Next, an example shown in FIG.
Is arranged in the machine frame B3 to which the motor B2 is attached, and the driven shaft B6 to which rotation is transmitted from the motor shaft B4 via the shaft coupling B5 is braked.

The basic structure itself of the electromagnetic brake B1 is substantially the same as that shown in FIG. 10 described above, and the friction plate B7 is driven by a driven shaft via a brake hub B8 fitted and fixed to the driven shaft B6. It is connected so as to rotate integrally with B6.

An annular gap B9 is formed between a part of the inner peripheral surface of the brake hub B8 and the outer peripheral surface of the driven shaft B6, and the inner peripheral surface has a tapered surface in the clearance B9. The formed outer ring B10 and the inner ring B11 whose outer peripheral surface is formed with a tapered surface that matches the tapered surface are incorporated.

On the other hand, a pressure flange B12 is connected to the brake hub B8 by a plurality of fastening bolts B13, and a boss B14 of the pressure flange B12 is fitted into the clearance B9.

When these fastening bolts B13 are tightened, the outer ring B is attached to the end face of the boss B14.
10 is pressed, and the tapered surface of the inner ring B11 is pressed.
Is pressed against the tapered surface.

As a result, due to the wedge action of these tapered surfaces, the outer ring B10 is elastically deformed in the direction in which the diameter increases, the outer peripheral surface thereof is pressed against the inner peripheral surface of the brake hub B8, and the inner ring B11 becomes Is elastically deformed in the direction of contraction, the inner peripheral surface thereof is pressed against the outer peripheral surface of the driven shaft B6, and the brake hub B8 is firmly frictionally fixed to the driven shaft B6 via both the rings B10 and B11.

The shaft joint B5 is also connected to the pressure flange B1.
2, and has a structure in which it is fixed to the driven shaft B6 by a number of fastening bolts B13 provided in the axial direction.

Further, the example shown in FIG.
The electromagnetic brake C1 is disposed in a machine frame C3 to which a motor C2 is mounted, and brakes a driven shaft C6 to which rotation is transmitted from a motor shaft C4 via a shaft coupling C5, as in the case shown in FIG. It is.

In this example, the brake hub C8 holding the friction plate C7 also functions as a pressure flange for fixing the shaft coupling C5 to the driven shaft C6, and the driven side coupling hub C10 is fastened. Due to the structure fixed by the bolt C11, the number of parts is smaller than that shown in FIG.

Further, in the example shown in FIG. 13, a mounting flange D7 integrally formed around a field D6 of an electromagnetic brake D5 is sandwiched between a mounting flange D2 at a front end of a motor D1 and a mounting surface D4 of a machine frame D3. And mounting bolt D
8, the motor D1 and the electromagnetic brake D5 are connected to the machine frame D3.
It is intended to be fixed to.

In this example, the motor shaft D9 and the driven shaft D10
Is connected to the drive-side coupling hub D12 of the shaft coupling D11, and a brake bub D14 holding a friction plate D13 of the electromagnetic brake D5 is externally fitted and fixed with a set screw D15.

[0020]

In the above-mentioned various conventional electromagnetic brakes, the structure in which the electromagnetic brake is built in the motor as shown in FIG. 10 is limited in order to facilitate the manufacture of the motor. Since the standardization is limited to only a few types, the braking torque of the electromagnetic brake becomes unnecessarily large depending on the capacity of the motor, resulting in a problem that the quality of the motor becomes excessive and the price of the motor increases. Therefore, an electromagnetic brake may be separately attached to the outside of the motor as in the examples shown in FIGS.

In FIG. 11, the brake bub is fixed to the driven shaft using a pressure flange and a fastening bolt, and in FIG. 12, the brake hub and the driven-side coupling hub are fastened to each other. These members are fastened with bolts to fix these members to the driven shaft.However, since many of these fastening bolts are provided in parallel with the axial direction, it takes time and effort to assemble the electromagnetic brake. In some cases, the machine frame must be extended in the axial direction in order to secure a work space in the machine frame for attaching and detaching fastening bolts and inserting fastening tools and the like. Therefore, when the electromagnetic brake is newly attached, there is a problem that a design change on the machine frame side is required, and it takes time to assemble the electromagnetic brake.

On the other hand, the one shown in FIG. 13 has an advantage that the machine frame for fixing the motor for mounting the electromagnetic brake does not need to be changed in design. However, it is necessary to fit the brake hub to the drive-side coupling hub of the shaft coupling, fix it with the set screw, and then attach the drive-side coupling hub to the motor shaft. It has not been.

Therefore, the present invention solves the above-mentioned problems of the prior art, and does not require any design change on the motor or the machine frame side, so that the assembly is easy and the space required for the assembly is small. It is an object of the present invention to provide a non-excitation type electromagnetic brake.

[0024]

According to the present invention, there is provided a non-excited operation type electromagnetic brake having a mounting flange interposed between a motor frame to which a motor is mounted and a motor flange. A field in which an electromagnetic coil is built and a through hole for passing a motor shaft is formed in the center, and a predetermined gap is provided between the field and the end face of the field opposite to the end face on the motor flange side, and the field is fixed to the field. Plate, a friction plate disposed adjacent to the plate in the gap, and disposed between the friction plate and the field, and is pressed against the friction plate when the electromagnetic coil is de-energized by an urging member, When the coil is energized, the armature is attracted to the field side against the urging force of the urging member, and the friction plate can be displaced in the axial direction with respect to the axis of the motor shaft. A brake hub having a friction plate holding portion for holding the two so as to rotate together, and having a resiliently deformable tubular portion fitted to the tip end of the motor shaft; and a brake hub fitted to the tubular portion outer peripheral surface of the brake hub. And a drive-side coupling hub connected to a driven-side coupling hub provided at an end of the driven shaft.

The drive-side coupling hub is provided with a fastening portion having a slit formed in a radial direction between an outer peripheral surface and an inner peripheral surface thereof, and a fastening screw traversing the slit. Is provided, and is fixed to the motor shaft together with the brake hub by tightening the fastening screw.

A non-excited operation type electromagnetic brake according to a second aspect of the present invention has a mounting flange interposed between a machine frame on which a motor is mounted and a motor flange, and has a motor shaft passed through the center. A through-hole is formed, a field in which a permanent magnet and an electromagnetic coil that cancels out the magnetic force of the permanent magnet when energized is arranged around the through-hole, and fixed to an end face of the field opposite to the end face on the motor flange side. A friction plate, a brake hub having an elastically deformable cylindrical portion fitted to a motor shaft tip portion and a flange portion disposed opposite to the friction plate with a predetermined gap therebetween, and the flange portion; It is axially displaceable with respect to the axis of the motor shaft with respect to the friction plate and is held so as to rotate integrally with the brake hub. When the electromagnetic coil is not energized, the magnetic force of the permanent magnet is An armature that is attracted to the friction plate and is moved away from the friction plate by the urging force of the urging member when the electromagnetic coil is energized, is fitted to the outer peripheral surface of the cylinder portion of the brake hub, and is provided at the end of the driven shaft. And a driving-side coupling hub connected to the driven-side coupling hub.

The drive-side coupling hub is provided with a fastening portion having a slit formed in a radial direction between an outer peripheral surface and an inner peripheral surface thereof, and a fastening screw traversing the slit. Is provided, and is fixed to the motor shaft together with the brake hub by tightening the fastening screw.

A non-excited operation type electromagnetic brake according to a third aspect of the present invention has a mounting flange interposed between a machine frame to which a motor is mounted and a motor flange, and has a built-in electromagnetic coil and a central portion. A field in which a through-hole through which the motor shaft passes is formed, a plate fixed to the field with a predetermined gap from the end face of the field opposite to the motor flange side end face, and a plate in the gap. The friction plate is disposed between the friction plate and the field, and is pressed against the friction plate when the electromagnetic coil is not energized by the urging member, and is pressed against the friction plate when the electromagnetic coil is energized. An armature that is attracted and moved toward the field against the urging force, and that the friction plate is axially displaceable with respect to the axis of the motor shaft so as to rotate integrally therewith. Fitted to the motor shaft tip and having a friction plate holding unit that, and a drive-side coupling hub that is connected to the driven side coupling hub provided at an end portion of the driven shaft.

The drive-side coupling hub is provided with a fastening portion having a slit formed in a radial direction between an outer peripheral surface and an inner peripheral surface thereof, and a fastening screw traversing the slit. Is provided, and is fixed to the motor shaft by tightening the fastening screw.

A non-excited operation type electromagnetic brake according to a fourth aspect of the present invention has a mounting flange interposed between a motor frame to which a motor is mounted and a motor flange, and has a motor shaft passed through the center. A through-hole is formed, a field in which a permanent magnet and an electromagnetic coil that cancels out the magnetic force of the permanent magnet when energized is arranged around the through-hole, and fixed to an end face of the field opposite to the end face on the motor flange side. A friction plate, and a flange portion disposed opposite to the friction plate with a predetermined gap therebetween. The flange portion is fitted to the distal end of the motor shaft, and the driven side provided at the end of the driven shaft. A drive-side coupling hub connected to the coupling hub; and an axially displaceable relative to the axis of the motor shaft between the flange portion and the friction plate, and integrally rotating with the drive-side coupling hub. An armature that is held and is attracted to the friction plate by the magnetic force of the permanent magnet when the electromagnetic coil is not energized, and is moved away from the friction plate by the urging force of the urging member when the electromagnetic coil is energized. .

The drive-side coupling hub is provided with a fastening portion having a slit formed in a radial direction between an outer peripheral surface and an inner peripheral surface thereof, and a fastening screw traversing the slit. Is provided, and is fixed to the motor shaft by tightening the fastening screw.

A non-excited operation type electromagnetic brake according to a fifth aspect of the present invention has a mounting flange which is mounted in a machine frame, has a built-in electromagnetic coil, and is formed with a through hole through which a driven shaft passes through a central portion. A field, a plate fixed to the field with a predetermined gap from an end face opposite to an end face of the field attached to the machine frame, and a friction plate disposed adjacent to the plate in the gap. Plate, disposed between the friction plate and the field, is pressed against the friction plate by the biasing member when the electromagnetic coil is not energized, and is pressed against the biasing force of the biasing member when the electromagnetic coil is energized. And a friction plate holding portion for holding the friction plate so as to be axially displaceable with respect to the axis of the driven shaft and rotate integrally with the armature, and fitted to the tip of the driven shaft. A brake hub having an elastically deformable cylindrical portion, and a drive-side coupling hub that is fitted to the outer peripheral surface of the cylindrical portion of the brake hub and that is provided at a tip end of a motor shaft of a motor attached to the machine frame. And a driven-side coupling hub to be connected.

The driven-side coupling hub is provided with a fastening portion in which a slit is formed in a radial direction between an outer peripheral surface and an inner peripheral surface thereof. Is provided, and is fixed to the driven shaft together with the brake hub by tightening the fastening screw.

According to a sixth aspect of the present invention, there is provided a non-excited operation type electromagnetic brake having a mounting flange mounted in a machine frame, a through-hole through which a driven shaft passes through a center portion, and a periphery of the through-hole. A field in which a permanent magnet and an electromagnetic coil that cancels out the magnetic force of the permanent magnet when energized are arranged; a friction plate fixed to an end face of the field opposite to an end face of the field to be attached to the machine frame; A brake hub having a flange portion opposed to the plate at a predetermined gap and an elastically deformable tubular portion fitted to the tip of the driven shaft; and a driven shaft between the flange portion and the friction plate. And is held so as to be axially displaceable with respect to the axis and rotate integrally with the brake hub, and is attracted to the friction plate by the magnetic force of the permanent magnet when the electromagnetic coil is not energized, and when the electromagnetic coil is energized. The biasing force of the biasing member Therefore, the armature that is moved away from the friction plate is fitted to the outer peripheral surface of the cylinder portion of the brake hub, and is connected to the drive-side coupling hub provided at the end of the motor shaft of the motor attached to the machine frame. And a driven-side coupling hub.

The driven side coupling hub is provided with a fastening portion having a slit formed in a radial direction between an outer peripheral surface and an inner peripheral surface thereof, and a fastening screw traversing the slit. Is provided, and is fixed to the driven shaft together with the brake hub by tightening the fastening screw.

A non-excited operation type electromagnetic brake according to a seventh aspect of the present invention has a mounting flange mounted in the machine frame, a built-in electromagnetic coil, and a through-hole through which a driven shaft passes through a central portion. A field, a plate fixed to the field with a predetermined gap from an end face opposite to an end face of the field attached to the machine frame, and a friction plate disposed adjacent to the plate in the gap. Plate, disposed between the friction plate and the field, is pressed against the friction plate by the biasing member when the electromagnetic coil is not energized, and is pressed against the biasing force of the biasing member when the electromagnetic coil is energized. An armature to be sucked and moved, and a friction plate holding portion for holding the friction plate so as to be axially displaceable and integrally rotatable with respect to the axis of the driven shaft, and fitted to the tip of the driven shaft, A driven-side coupling hub connected to a drive-side coupling hub provided at a distal end portion of the motor shaft, wherein the driven-side coupling hub extends between an outer peripheral surface and an inner peripheral surface thereof. A fastening portion having a slit formed in the radial direction is provided, a fastening screw is provided across the slit, and the fastening screw is fixed to the driven shaft by tightening the fastening screw.

The non-excited operation type electromagnetic brake according to claim 8 of the present invention has a mounting flange mounted in the machine frame and has a through hole formed through a driven shaft at a central portion.
A field in which a permanent magnet and an electromagnetic coil that cancels the magnetic force of the permanent magnet when energized are arranged around the through hole,
A friction plate fixed to an end surface opposite to an end surface of the field attached to the machine frame, and a flange portion disposed opposite to the friction plate with a predetermined gap therebetween, the driven shaft tip And a driven coupling hub connected to a driving coupling hub provided at the motor shaft tip, and an axis relative to an axis of the driven shaft between the flange and the friction plate. It is displaceable in the direction and is held so as to rotate integrally with the driven-side coupling hub, and is attracted to the friction plate by the magnetic force of the permanent magnet when the electromagnetic coil is not energized, and is energized when the electromagnetic coil is energized. An armature that is moved away from the friction plate by the urging force of the member.

The driven-side coupling hub is provided with a fastening portion having a slit formed in a radial direction between an outer peripheral surface and an inner peripheral surface thereof, and a fastening screw traversing the slit. Is provided, and is fixed to the driven shaft by tightening the fastening screw.

According to a ninth aspect of the present invention, there is provided a non-excitation operation type electromagnetic brake, wherein the field of the non-excitation operation type electromagnetic brake according to any one of the first to eighth aspects is combined with a field body having an electromagnetic coil built therein. And a mounting flange separably fixed to the field main body.

[0040]

The non-excited operation type electromagnetic brake according to claims 1 to 4,
The motor is fixed to the machine frame in a state where the field mounting flange is sandwiched between the machine frame and the motor flange, the cylinder portion of the brake hub is fitted to the motor shaft, and the drive side cup is attached to the outer peripheral surface of the cylinder portion. When the ring hub is fitted, or the drive-side coupling hub is directly fitted to the motor shaft, and the fastening screw provided at the fastening portion of the drive-side coupling hub is tightened, the inner peripheral surface of the fastening portion becomes The diameter of the driving-side coupling hub is reduced indirectly or directly to the motor shaft by elastic deformation. The drive-side coupling hub is connected to a driven-side coupling hub provided on the driven shaft.

In the first and third aspects,
When the motor is stopped and the electromagnetic coil built in the field is not energized, the armature is urged by the urging member and pressed against the friction plate, and the friction plate is moved between the armature and the plate. And is braked by the frictional force, and the rotation of the motor shaft is prevented.

Next, when the electromagnetic coil is energized at the same time as the motor is energized, the field is excited and the armature is attracted and moved against the urging force of the urging member. The friction plate sandwiched between the two is released, and the motor shaft can freely rotate. When the motor shaft rotates, the rotation is transmitted from the drive-side coupling hub to the driven shaft via the driven-side coupling hub.

According to the second and fourth aspects, when the motor is stopped and the electromagnetic coil built in the field is not energized, the motor rotates integrally with the brake hub or the drive-side coupling hub. The armature that is provided to the motor is attracted to a friction plate fixed to the field by a permanent magnet and is braked by a frictional force, so that rotation of the motor shaft is prevented.

Next, when the electromagnetic coil is energized simultaneously with energizing the motor, the magnetic force generated by the electromagnetic coil cancels the magnetic force of the permanent magnet, and the armature is separated from the friction plate by the urging force of the urging member. Thus, the motor shaft can freely rotate. When the motor shaft rotates, the rotation is transmitted from the drive-side coupling hub to the driven shaft via the driven-side coupling hub.

The non-excited operation type electromagnetic brake according to any one of claims 5 to 8 is fixed in the machine frame by a mounting flange, a cylinder portion of a brake hub is fitted to a driven shaft, and a driven side on an outer peripheral surface of the cylinder portion. When the coupling hub is fitted, or the driven shaft is directly fitted to the driven coupling hub, and the fastening screw provided at the fastening portion of the driven coupling hub is tightened, the inner peripheral surface of the fastening portion is formed. Is reduced in diameter by elastic deformation and is indirectly or directly fixed to the driven shaft. The driven-side coupling hub is connected to a drive-side coupling hub provided on the motor shaft.

According to the fifth and seventh aspects,
When the motor is stopped and the electromagnetic coil built in the field is not energized, the armature is urged by the urging member and pressed against the friction plate, and the friction plate is moved between the armature and the plate. And is braked by the frictional force, and the rotation of the driven shaft is prevented.

Next, when the electromagnetic coil is energized at the same time as the motor is energized, the field is energized and the armature is attracted and moved against the urging force of the urging member. The friction plate sandwiched between the shafts is released, and the driven shaft can freely rotate. When the motor shaft rotates, the rotation is transmitted from the drive-side coupling hub to the driven shaft via the driven-side coupling hub.

According to the sixth and eighth aspects, when the motor is stopped and the electromagnetic coil incorporated in the field is not energized, the motor rotates integrally with the brake hub or the drive-side coupling hub. The armature provided to be driven is attracted to a friction plate fixed to the field by a permanent magnet and is braked by a frictional force, so that rotation of the driven shaft is prevented.

Next, when the electromagnetic coil is energized simultaneously with energizing the motor, the magnetic force generated by the electromagnetic coil cancels the magnetic force of the permanent magnet, and the armature is separated from the friction plate by the urging force of the urging member. , The driven shaft can rotate freely. When the motor shaft rotates, the rotation is transmitted from the drive-side coupling hub to the driven shaft via the driven-side coupling hub.

According to the non-excited operation type electromagnetic brake of the ninth aspect, a plurality of types of motors having different motor flange shapes and a plurality of types of machine frames having different mounting surface shapes are provided.
This can be achieved simply by preparing a plurality of types of mounting flanges suitable for each mounting surface.

[0051]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of a non-excited operation type electromagnetic brake according to the present invention.
FIG. 2 is a cross-sectional view showing the embodiment, in which an electromagnetic brake 1 is disposed between a motor 2 and a machine frame 3 to which the motor 2 is fixed, and a mounting flange 4 </ b> A provided on an outer peripheral surface of a field 4 has 3 and a motor flange 2A provided at the front end of the motor 2, and is fixed to the machine frame 3 together with the motor 2 by a plurality of mounting bolts 5.

A through hole 4B through which the motor shaft 6 passes is formed at the center of the field 4, and an electromagnetic coil 7 is incorporated inside the field 4. Field 4
An annular plate 8 is fixed by a plurality of mounting bolts 9 arranged in the circumferential direction opposite to the end surface on the side opposite to the motor flange 2A side of the motor flange 2A. It is held in a predetermined gap S by a collar 10 which is externally fitted to the mounting bolt 9.

An armature 11 and a friction plate 12 are arranged in the gap. The armature 11 is formed of a magnetic material in a disk shape, and has a motor shaft 6 at the center thereof.
Has a through hole 11A through which a collar 1 of the mounting bolt 9 is inserted into a guide hole 11B provided in an outer peripheral portion thereof.
0 is slidably inserted and supported so as to be movable in parallel with the axis of the motor shaft 6.

Further, the armature 11 is urged toward the plate 8 by an urging member such as a compression coil spring (not shown), and only when the electromagnetic coil 7 is energized to excite the field 4, It is attracted and moved toward the field 4 against the urging member.

The friction plate 12 is formed in an annular shape and has friction surfaces on both sides, and the inner peripheral surface is supported by a brake bubble 13 frictionally fixed to the motor shaft 6. The brake bub 13 includes a flange-shaped friction plate holding portion 13.
A and an elastically deformable cylindrical portion 13B fitted to the distal end of the motor shaft 6, and the friction plate holding portion 13A
Hold the inner peripheral surface of the friction plate 12 on the outer peripheral surface. The outer peripheral surface of the friction plate holding portion 13A and the inner peripheral surface of the friction plate 12 are formed in a shape that mesh with each other to regulate the relative rotation of the friction plate 12 with respect to the brake bub 13 and allow the friction plate 12 to be displaced in the axial direction. ing.

The drive-side coupling hub 14 is externally fitted on the outer peripheral surface of the cylindrical portion 13B. The drive-side coupling hub 14 includes a flange portion 14A and a boss-shaped fastening portion 14B that is continuous with one side in the axial direction of the flange portion 14A. The fastening portion 14B has one radial slit G formed between the outer peripheral surface and the inner peripheral surface.

One side and the other side of the fastening portion 14B separated from each other by the slit G are connected by a fastening screw 15 crossing the slit G. That is, a through hole for the fastening screw 15 is formed on one side of the fastening portion 14B with the slit G interposed therebetween, and a screw hole into which the fastening screw 15 is screwed is formed on the other side. When tightened, the fastening portion 14B is elastically deformed so that the gap of the slit G is narrowed, and the inner peripheral surface thereof tightens the cylinder portion 13B of the brake bubble 13. Then, the cylindrical portion 13 </ b> B is elastically deformed by the tightening force to tighten the motor shaft 6, and the drive-side coupling hub 14 is fixed to the motor shaft 6 together with the brake bub 13.

In this embodiment, the fastening screws 15
When tightening, to facilitate elastic deformation of the fastening portion 14B, and to prevent distortion of the flange portion 14A,
The flange portion 14A and the fastening portion 14B are partially separated by a slit G 'perpendicular to the slit G.

On the other hand, a driven shaft 16 is disposed inside the machine frame 3 substantially coaxially with the motor shaft 6, and a driven-side coupling hub 17 is fitted to the front end of the driven shaft.
The driven-side coupling hub 17 has a fastening portion 17 similar to the fastening portion 14B of the driving-side coupling hub 14 described above.
B, and is fixed to the driven shaft 16 by tightening the fastening screw 18.

The driving-side coupling hub 14 and the driven-side coupling hub 17 are opposed to each other by a flange portion 14A.
And the flange portion 17A are indirectly connected to each other via thin annular leaf springs 20 alternately connected by fastening members 19 arranged at a plurality of positions in the circumferential direction. The power is transmitted to the driven shaft 13. At this time, an error between the axis of the motor shaft 6 and the axis of the driven shaft 13 is absorbed by the bending deformation of the leaf spring 20.

When the motor 2 is not energized, the electromagnetic brake 7 having the above-mentioned configuration is not energized to the electromagnetic coil 7 built in the field 4, and the armature 11 is driven by the urging force of the urging member. 12 is pressed against the armature 11 and the plate 8
And is braked by mutual frictional force,
The rotation of the motor shaft 6 connected to the friction plate 12 via the brake bub 13 is prevented.

When the power is supplied to the motor 2 and the electromagnetic coil 7 is energized at the same time, the field 4 is excited to attract and move the armature 11 against the urging force of the urging member. 8 is released, the motor shaft 6 starts rotating, and the rotation is transmitted from the drive-side coupling hub 14 to the driven shaft 16 via the driven-side coupling hub 17. Is done.

FIG. 2 is a sectional view showing a second embodiment of the non-excited operation type electromagnetic brake according to the present invention. In the electromagnetic brake 1 shown in FIG. There is no structural difference from the electromagnetic brake shown in FIG.

In the electromagnetic brake 1 shown in FIG. 2, the field 4 has a mounting flange 4A and a motor shaft 6 at the center.
Of the field main body 4C containing the electromagnetic coil 7 in which the through hole 4B is formed, the outer peripheral surface of the field main body 4C is fitted to the inner peripheral surface of the mounting flange 4A, and the mounting flange is formed. Both are detachably fixed through bolts 21 in the radial direction from the outer peripheral surface side of 4A. With this structure, it is possible to cope with the motors 2 of different companies having different shapes of the motor flange 2A by replacing only the mounting flange 4A.

FIG. 3 is a sectional view showing a third embodiment of the non-excited operation type electromagnetic brake according to the present invention. The electromagnetic brake 1 of this embodiment is different from the first embodiment shown in FIG. Similarly to the above, the motor frame 2 is mounted between the motor flange 2A and the machine casing 3 via a mounting flange 4A formed integrally with the field 4.

In this embodiment, the permanent magnet 2
Further, a friction plate 23 is embedded and fixed to the end face of the field 4 opposite to the motor flange 2A side, and a brake hub is provided with a predetermined gap in the axial direction with respect to the friction plate 23. Twenty-four collar portions 24A are arranged to face each other.

The brake hub 24 has the first
A tubular portion 24B similar to the brake hub of the embodiment is formed, and the tubular portion 24 is fitted to the tip of the motor shaft 6,
The drive side coupling hub 14 is fitted on the outer peripheral surface of the cylindrical portion 24B.

As in the above-described embodiments, the drive-side coupling hub 14 is connected to the driven-side coupling hub 17 fixed to the tip of the driven shaft 16.

A part of an annular leaf spring 26 as an urging member is fixed to a surface of the flange 24A facing the friction plate 23 by a rivet 25A.

On the other hand, the leaf spring 26 is provided with a rivet 25A.
The armature 27 is fixed to the armature 27 with rivets 25B at a position spaced apart from the position where it is fixed in the circumferential direction of the flange portion 24A.
4 and can be displaced in the axial direction. In this embodiment, the rivet 25A and the rivet 2
5B are alternately provided three in the circumferential direction.

When the motor 2 is stopped and the electromagnetic coil 7 disposed between the permanent magnet 21 and the friction plate 23 is not energized, the armature 27 moves to the yoke 28 surrounding the electromagnetic coil 7. The leaf spring 26 is elastically deformed by the magnetic force of the permanent magnet 21 acting through
As a result, the rotation of the brake hub 24 is prevented, and the motor shaft 6 is in a braked state.

When the electromagnetic coil 7 is energized at the same time as the motor 2 is energized, the electromagnetic coil 7
The armature 27 is released from the friction plate 23 by the elastic restoring force of the leaf spring 26 and moves to the position shown in FIG. The rotation of the motor shaft 6 is started.

Next, FIG. 4 is a sectional view showing a fourth embodiment of the non-excited operation type electromagnetic brake according to the present invention. In this embodiment, the structure of the first embodiment shown in FIG. 1 is simplified. Things
It has no brake hub as an independent part, and its function is also performed by the drive-side coupling hub 29, so that the number of parts is reduced.

The components other than the drive-side coupling hub 29 used in the non-excited operation type electromagnetic brake 1 of this embodiment are the same as those of the above-described first embodiment shown in FIG. The description of the overlapping part is omitted.

The drive-side coupling hub 29 has a flange portion 29 A for connecting to the driven-side coupling hub 17, and a radial slit fastened and fixed to the distal end of the motor shaft 6 directly with the fastening screw 15. It has a fastening portion 29B formed with G and a flange-shaped friction plate holding portion 29C similar to the friction plate holding portion formed on the brake hub in the first embodiment described above.

In this embodiment, the fastening screws 15
When tightening, the fastening portion 29BB is easily elastically deformed, and the flange portion 29A and the friction plate holding portion 29C
In order to prevent the distortion, a slit G′G ″ perpendicular to the slit G is formed on both sides of the fastening portion 29B.

FIG. 5 is a sectional view showing a fifth embodiment of the non-excitation operation type electromagnetic brake according to the present invention. This embodiment is a non-excitation operation type electromagnetic brake of the third embodiment shown in FIG. This is a simplified structure of the electromagnetic brake, and has no brake hub as an independent component as in the case of the above-described fourth embodiment, and the function of the drive-side coupling hub 30 is also used. , The number of parts has decreased.

The drive-side coupling hub 30 has a flange portion 30 A for connecting to the driven-side coupling hub 17, and a radial slit fastened and fixed to the distal end of the motor shaft 6 directly with the fastening screw 15. It has a fastening portion 30B in which G is formed and a flange portion 30C having the same shape as the flange portion formed on the brake hub in the third embodiment described above.

For the same reason as that of the above-described fourth embodiment, slits G′G ″ perpendicular to the slit G are formed on both sides of the fastening portion 30B. Since the configuration is the same as that of the third embodiment, the description is omitted.

FIG. 6 is a sectional view showing a sixth embodiment of the non-excitation type electromagnetic brake according to the present invention. In this embodiment, the motor flange 2A of the motor 2 The non-excited operation type electromagnetic brake 1 is fixed to 31A, and is bolted to a mounting surface 31B formed inside the machine frame 31 via a mounting flange 4A of the field 4.

In the field 4, the mounting flange 4A can be separated from the field main body 4C containing the electromagnetic coil 7 in which the through hole 4B of the driven shaft 16 is formed, and only the mounting flange 4A needs to be replaced. so,
The field main body 4B can be attached to various machine frames.

The structure and operation of the non-excited operation type electromagnetic brake 1 of this embodiment are basically the same as those of the first and second embodiments shown in FIG. 1 or FIG. In this embodiment, the drive-side coupling hub of these embodiments is used as the driven-side coupling hub 14 ′, and is fixed to the distal end of the driven shaft 16 via the thin cylindrical portion 13 B of the brake hub 13. Have been.

Non-excited operation type electromagnetic brake 1 of this embodiment
Is braking the driven shaft 16 when the motor 2 is stopped, and when the electromagnetic coil 7 is energized simultaneously with energizing the motor 2,
The braking of the driven shaft 16 is released, and the rotation of the motor shaft 6 is transmitted to the driven shaft 16 via the driving coupling 17 ′ connected to the driven coupling hub 14 ′.

FIG. 7 is a sectional view showing a seventh embodiment of the non-excited operation type electromagnetic brake of the present invention. The non-excited operation type electromagnetic brake 1 of this embodiment is the same as that of the sixth embodiment. The brake is disposed in the machine frame 31 and brakes the driven shaft 16 side in the same manner as that of the third embodiment. The configuration and operation of the non-excited operation type electromagnetic brake 1 itself are the same as those of the third embodiment shown in FIG. The description is omitted because they are basically the same.

Non-excitation type electromagnetic brake 1 of this embodiment
Is bolted to a mounting surface 31B formed inside the machine frame 31 via a mounting flange 4A of the field 4, similarly to the sixth embodiment, and the motor shaft 6 is connected via a drive-side coupling hub 17 '. It is used by being connected to the driven-side coupling hub 14 ′ of the non-excited operation type electromagnetic brake 1.

Next, FIG. 8 is a sectional view showing an eighth embodiment of the non-excitation operation type electromagnetic brake of the present invention. 7
Similarly to the embodiment, it is mounted on the mounting surface 31B in the machine frame 31 by the mounting flange 4A of the field 4 to brake the driven shaft 16 side.

The structure and operation of the non-excited operation type electromagnetic brake 1 of this embodiment are basically the same as those of the fourth embodiment shown in FIG. I do.

Next, FIG. 9 is a sectional view showing a ninth embodiment of the non-excited operation type electromagnetic brake of the present invention. As in the eighth embodiment, the driven shaft 1
This is to brake the 6 side.

The structure and operation of the non-excited operation type electromagnetic brake itself of this embodiment are basically the same as those of the fifth embodiment shown in FIG. I do.

In each of the embodiments described above, the driven-side coupling hub or the mating driven-side coupling hub connected to the driven-side coupling hub or the driven-side coupling hub which is a part of the non-excited operation type electromagnetic brake. The side coupling hub is structured to be fixed to the driven shaft or the motor shaft with a single fastening screw crossing the slit provided in the fastening portion, but the means for fixing to these shafts is limited to those of the embodiment. Instead, those having various conventionally known structures can be used.

The flexible coupling is formed by connecting the driving-side coupling hub and the driven-side coupling hub with a leaf spring. The members may be directly connected by a fastening member, or may be connected using another known shaft coupling structure.

[0092]

As described above, according to the non-excited operation type electromagnetic brake of the present invention, one fastening screw provided on the drive-side coupling hub or the driven-side coupling hub is connected from the side. Since the structure is such that the motor shaft and the driven shaft can be connected only by tightening, the assembling operation can be performed easily and quickly.

Further, since the axial length of the brake unit is short and there is no need to secure the working space in the axial direction of the machine frame necessary for the work of assembling the brake unit, there is no need to design the machine frame to which the motor is fixed. Without modification, a non-excited operation type electromagnetic brake can be incorporated between the driven shaft and the motor shaft disposed in the machine frame.

Further, when the field is composed of a field main body having a built-in electromagnetic coil and a mounting flange separably fixed to the field main body, a plurality of types of motors having different motor flange shapes, It is possible to easily cope with a plurality of types of machine frames having different mounting surface shapes simply by preparing a plurality of types of mounting flanges suitable for each mounting surface.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of a non-excitation operation type electromagnetic brake according to the present invention.

FIG. 2 is a sectional view showing a second embodiment of the non-excited operation type electromagnetic brake of the present invention.

FIG. 3 is a sectional view showing a third embodiment of the non-excited operation type electromagnetic brake of the present invention.

FIG. 4 is a sectional view showing a fourth embodiment of the non-excited operation type electromagnetic brake of the present invention.

FIG. 5 is a sectional view showing a fifth embodiment of the non-excited operation type electromagnetic brake according to the present invention.

FIG. 6 is a sectional view showing a sixth embodiment of the non-excited operation type electromagnetic brake of the present invention.

FIG. 7 is a sectional view showing a seventh embodiment of the non-excited operation type electromagnetic brake of the present invention.

FIG. 8 is a sectional view showing an eighth embodiment of the non-excited operation type electromagnetic brake of the present invention.

FIG. 9 is a sectional view showing a ninth embodiment of the non-excited operation type electromagnetic brake of the present invention.

FIG. 10 is a sectional view showing an example of a non-excitation operation type electromagnetic brake built in a conventional motor.

FIG. 11 is a sectional view showing an example of a non-excitation operation type electromagnetic brake provided outside a conventional motor.

FIG. 12 is a sectional view showing another example of a non-excitation operation type electromagnetic brake provided outside a conventional motor.

FIG. 13 is a sectional view showing still another example of the non-excitation operation type electromagnetic brake provided outside the conventional motor.

[Explanation of symbols]

 Reference Signs List 1 electromagnetic brake 2 motor 2A motor flange 3,31 machine frame 4 field 4A mounting flange 4B through hole 4C field main body 6 motor shaft 7 electromagnetic coil 8 plate 11,27 armature 12,23 friction plate 13,24 brake hub 13A, 29C friction Plate holding portion 13B, 24B Tube portion 14, 17 ', 29, 30 Drive-side coupling hub 14', 17 Driven-side coupling hub 14B, 29B, 30B Fastening portion 15, 18 Fastening screw 16 Follower shaft 22 Permanent magnet 26 Plate Spring (biasing member)

Claims (9)

[Claims] 1. A field having a mounting flange interposed between a machine frame on which a motor is mounted and a motor flange, and having a through hole through which a motor shaft is formed at a center portion, which has a built-in electromagnetic coil, A plate fixed to the field with a predetermined gap between the end face of the field opposite to the motor flange side end face, a friction plate disposed adjacent to the plate in the gap, and the friction plate; An armature that is disposed between the armature and the urging member, is pressed against the friction plate when the electromagnetic coil is not energized by the urging member, and is attracted to the field side against the urging force of the urging member when the electromagnetic coil is energized; A friction plate holding portion for holding the friction plate so as to be axially displaceable with respect to the axis of the motor shaft and to rotate integrally therewith; Fitting a brake hub having an elastically deformable cylindrical portion to be engaged, with fitted in the cylindrical portion outer peripheral surface of the brake hub,
A driving-side coupling hub connected to a driven-side coupling hub provided at an end of the driven shaft, wherein the driving-side coupling hub has a radius extending between an outer peripheral surface and an inner peripheral surface thereof. A non-excited magnet, wherein a fastening portion having a slit formed in the direction is provided, a fastening screw is provided across the slit, and the fastening screw is fixed to the motor shaft together with the brake hub by tightening the fastening screw. Actuated electromagnetic brake. 2. A motor having a mounting flange interposed between a machine frame on which a motor is mounted and a motor flange, a through hole formed through a motor shaft at a center portion, and a permanent magnet around the through hole. A field in which an electromagnetic coil that cancels out the magnetic force of the permanent magnet when energized is arranged; a friction plate fixed to an end surface of the field opposite to a motor flange side end surface; and a predetermined gap with respect to the friction plate. A brake hub having an elastically deformable cylindrical portion fitted to a flange portion and a motor shaft distal end portion which are disposed opposite to each other with a gap, and an axial direction with respect to the axis of the motor shaft between the flange portion and the friction plate. It is displaceable and held so as to rotate integrally with the brake hub, and is attracted to the friction plate by the magnetic force of the permanent magnet when the electromagnetic coil is not energized, and is biased when the electromagnetic coil is energized. And an armature that is moved away from the friction plate by the urging force, and is fitted to the outer peripheral surface of the cylinder portion of the brake hub,
A drive-side coupling hub connected to a driven-side coupling hub provided at an end of the driven shaft, wherein the drive-side coupling hub has a radius extending between an outer peripheral surface and an inner peripheral surface thereof. A non-excited magnet, wherein a fastening portion having a slit formed in the direction is provided, a fastening screw is provided across the slit, and the fastening screw is fixed to the motor shaft together with the brake hub by tightening the fastening screw. Actuated electromagnetic brake. 3. A field having a mounting flange interposed between a machine frame on which a motor is mounted and a motor flange, and having a through hole through which a motor shaft is formed at a center portion, wherein the field has a built-in electromagnetic coil. A plate fixed to the field with a predetermined gap from the end face of the field opposite to the motor flange side end face, a friction plate disposed adjacent to the plate in the gap, and the friction plate; An armature that is disposed between the armature and the urging member, is pressed against the friction plate when the electromagnetic coil is not energized by the urging member, and is attracted to the field side against the urging force of the urging member when the electromagnetic coil is energized; A friction plate holding portion for holding the friction plate so as to be axially displaceable with respect to the axis of the motor shaft and to rotate integrally therewith; A drive-side coupling hub that is fitted and connected to a driven-side coupling hub provided at an end of the driven shaft, wherein the drive-side coupling hub has an outer peripheral surface and an inner peripheral surface And a fastening portion having a slit formed in the radial direction is provided, a fastening screw is provided across the slit, and the fastening portion is fixed to the motor shaft by tightening the fastening screw. Excitation operated electromagnetic brake. 4. A motor having a mounting flange interposed between a machine frame to which a motor is mounted and a motor flange, a through hole formed through a motor shaft at a center portion, and a permanent magnet around the through hole. A field in which an electromagnetic coil that cancels out the magnetic force of the permanent magnet when energized is arranged; a friction plate fixed to an end surface of the field opposite to a motor flange side end surface; and a predetermined gap with respect to the friction plate. A drive-side coupling hub that has a flange portion that is opposed to the drive shaft and that is fitted to the distal end of the motor shaft, and that is connected to a driven-side coupling hub provided at an end of the driven shaft; It is axially displaceable with respect to the axis of the motor shaft between the flange portion and the friction plate, is held so as to rotate integrally with the drive-side coupling hub, and when the electromagnetic coil is not energized. An armature that is attracted to the friction plate by the magnetic force of the permanent magnet and is moved away from the friction plate by the urging force of the urging member when the electromagnetic coil is energized. The driving-side coupling hub has an outer peripheral surface. A fastening portion having a slit formed in the radial direction is provided between the inner peripheral surface and the inner peripheral surface, and a fastening screw is provided across the slit, and is fixed to the motor shaft by tightening the fastening screw. A non-excited operation type electromagnetic brake characterized by the following. 5. A field having a mounting flange mounted in a machine frame, having a through hole through which a driven shaft is built in with a built-in electromagnetic coil, and an end face on the mounting side of the field to the machine frame. And a plate fixed to the field with a predetermined gap to the end face opposite to the side, a friction plate disposed adjacent to the plate in the gap, and disposed between the friction plate and the field, An armature is pressed against the friction plate when the electromagnetic coil is not energized by the urging member, and is attracted to the field side against the urging force of the urging member when the electromagnetic coil is energized; and A brake hub having a friction plate holding portion which is axially displaceable with respect to the axis and holds the shaft so as to rotate integrally therewith, and which has a resiliently deformable tubular portion fitted to the tip end of the driven shaft; With fitted in the cylindrical portion outer peripheral surface of the brake hub,
A driven-side coupling hub connected to a drive-side coupling hub provided at a distal end of a motor shaft of a motor attached to the machine frame, wherein the driven-side coupling hub has an outer peripheral surface and an inner peripheral surface. And a fastening portion having a slit formed in the radial direction is provided between them, and a fastening screw is provided across the slit, and is fixed to the driven shaft together with the brake hub by tightening the fastening screw. A non-excited operation type electromagnetic brake, characterized in that: 6. An electromagnet having a mounting flange mounted in a machine frame and having a through-hole through which a driven shaft passes through a center portion, wherein a permanent magnet and a magnetic force of the permanent magnet cancel each other around the through-hole when energized. A field in which a coil is arranged; a friction plate fixed to an end surface opposite to an end surface of the field on the machine frame side; and a flange opposed to the friction plate with a predetermined gap therebetween. A brake hub having an elastically deformable tubular portion fitted to a portion and a driven shaft tip, and being axially displaceable with respect to the axis of the driven shaft between the flange portion and the friction plate and integral with the brake hub. The armature is held so as to rotate at a time, is attracted to the friction plate by the magnetic force of the permanent magnet when the electromagnetic coil is not energized, and is separated from the friction plate by the urging force of the urging member when the electromagnetic coil is energized. When, With fitted in the cylindrical portion outer peripheral surface of serial brake hub,
A driven-side coupling hub connected to a drive-side coupling hub provided at a distal end of a motor shaft of a motor attached to the machine frame, wherein the driven-side coupling hub has an outer peripheral surface and an inner peripheral surface. And a fastening portion having a slit formed in the radial direction is provided between them, and a fastening screw is provided across the slit, and is fixed to the driven shaft together with the brake hub by tightening the fastening screw. A non-excited operation type electromagnetic brake, characterized in that: 7. A field having a mounting flange mounted in a machine frame, having a built-in electromagnetic coil and having a through-hole through which a driven shaft passes through a center portion, and an end surface of the field on the mounting side to the machine frame. And a plate fixed to the field with a predetermined gap to the end face opposite to the side, a friction plate disposed adjacent to the plate in the gap, and disposed between the friction plate and the field, An armature is pressed against the friction plate when the electromagnetic coil is not energized by the urging member, and is attracted to the field side against the urging force of the urging member when the electromagnetic coil is energized; and A drive-side coupling housing, which has a friction plate holding portion that is axially displaceable with respect to the axis and holds the same so as to rotate integrally, is fitted to the tip of the driven shaft, and is provided at the tip of the motor shaft. And a driven-side coupling hub connected to the driven-side coupling hub, wherein the driven-side coupling hub is provided with a fastening portion having a slit formed in a radial direction across an outer peripheral surface and an inner peripheral surface thereof. A non-excited operation type electromagnetic brake, wherein a fastening screw is provided across the slit, and is fixed to the driven shaft by tightening the fastening screw. 8. A through-hole having a mounting flange mounted in the machine frame and through which a driven shaft passes through a central portion is formed.
A field in which a permanent magnet and an electromagnetic coil that cancels out the magnetic force of the permanent magnet when energized are arranged around the through hole, and friction fixed to an end face of the field opposite to the end face on the mounting side to the machine frame. Plate, having a flange portion disposed opposite to the friction plate with a predetermined gap, fitted to the driven shaft distal end, and a drive-side coupling hub provided at the motor shaft distal end. A driven-side coupling hub to be connected, and a shaft that is axially displaceable with respect to an axis of a driven shaft between the flange portion and the friction plate, and is held so as to rotate integrally with the driven-side coupling hub. An armature that is attracted to the friction plate by the magnetic force of the permanent magnet when the electromagnetic coil is not energized, and is moved away from the friction plate by the urging force of the urging member when the electromagnetic coil is energized; The pulling hub is provided with a fastening portion in which a slit is formed in the radial direction across the outer peripheral surface and the inner peripheral surface thereof, and a fastening screw is provided across the slit, and a fastening screw is provided. A non-excited operation type electromagnetic brake which is fixed to a driven shaft by tightening. 9. The field according to claim 1, wherein the field comprises a field main body in which an electromagnetic coil is built, and a mounting flange separably fixed to the field main body. Non-excited operation type electromagnetic brake as described.