JPH0249396Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is a negative actuation type electromagnetic brake that uses the elastic force of a spring member to press the armature against a disk when the electromagnetic coil is in a non-excited state to obtain braking torque. The present invention relates to a manual release device for manually releasing the brake.

[Conventional technology]

Negative actuation type electromagnetic brakes have a field core with an internal electromagnetic coil fixed to the machine to be braked, and the magnetic attraction surface of the field core comes into contact with the energization and de-excitation of the electromagnetic coil and the elastic force of the spring member. , comprising an armature that is spaced apart, and a disk that brakes the braked member by being fixed to the machine side by the clamping pressure between the armature and the machine side plate when the electromagnetic coil fixed to the braked shaft side is in a non-excited state. This type of negatively operated electromagnetic brake is provided with a manual release device that releases the brake by manual operation.

This type of manual release device includes, for example, the
A device disclosed in Japanese Patent No. 56-53131 is known. This device is equipped with a pair of eccentric pins supported by a device-side bracket that supports the field core, and a U-shaped handle with both ends fixedly supported by each of these eccentric pins.The handle can be rotated. By rotating the eccentric pin, the armature is moved toward the field core by the eccentric action of the eccentric pin, and the brake can be manually released when the electromagnetic coil is de-energized.

[Problem that the invention attempts to solve]

However, in such a conventional manual release device, since the manual release handle is swung from the outside of the shaft end so as to cross the axis of the braked shaft, the manual release device is not equipped with this device. When an electromagnetic brake is attached to, for example, a motor, the manual release device not only occupies a large space and cannot be configured compactly, but also has problems in that the manual rotation range of the handle is large and the operability is not good.

[Means for solving problems]

In order to solve these problems, the present invention uses a field core fixed to the equipment side,
In this negative actuation type electromagnetic brake equipped with an armature that moves in contact with and away from the magnetic attraction surface of the field core, the direction of movement of the swinging end is Each end of a semi-circular shifter in a direction parallel to the braking shaft is pivotably mounted, and a pressing member is provided near the swinging fulcrum of the shifter, the tip of which faces the plane of the armature on the side opposite to the field core. A shifter swing operation member is provided which is fixed and engages with the shifter swing end.

[Effect]

When the electromagnetic coil installed in the field core is de-energized, the armature is separated from the field core by the elastic force of the spring member, and the braked shaft is braked. When the operating member is operated in this state, the shifter swings and the pressing member moves in the axial direction, pushing the armature against the elastic force of the spring member and moving it toward the field core, releasing the brake. .

〔Example〕

Figures 1 to 3 show an example in which the manual release device according to the present invention is applied to a negative actuating electromagnetic brake for a motor, and Fig. 1 shows a part of the negative actuating electromagnetic brake and the motor in which the manual release device is applied. 2 is a front view of the
FIG. 2 is a side view of FIG. 1 taken along the direction C; In these figures, a fan 3 is pivotally attached to the tip of a motor shaft 2, which is a braked shaft rotatably supported on the motor body 1 side.
is the fan cover 4 fixed to the motor body 1 side.
covered with. The negative actuating electromagnetic brake, which is indicated by the reference numeral 5 as a whole, has a plurality of bolts 6 attached to the motor body 1.
The field core 7 has a field core 7 fixed thereto, and an electromagnetic coil 8 is fitted and fixed in an annular recessed portion of the field core 7 via a resin 9. On the side of the magnetic attraction surface 7a of the field core 7, a disc-shaped side plate 10 has a plurality of disk-shaped side plates 10 screwed into the field core at equal positions on the outer periphery and held at a predetermined distance by collars 11. The side plate 10 is fixed by bolts 12, and includes an outer plate 10a, an inner plate 10b, and a rubber plate 10 inserted between them to eliminate so-called whining noise during braking.
It is formed by c. Between the field core 7 and the side plate 10 fixed in this way, a disc-shaped armature 13 and a disc 14 are arranged.
The armature 1 of this
3 is slidably fitted and supported by the collar 11 through a hole in its outer periphery. Further, the disk 14 is spline-fitted to the motor shaft 2 with a key-fixed hub 15, and is formed to be movable only in the axial direction.
A compression coil spring 16 is loaded into a spring hole on the side of the field core 7 and urges the armature 13 toward the disk 14, and when the electromagnetic coil 8 is not energized, the disk 14 is moved between the side plate 10 and the armature 13. The motor shaft 2 is configured to be clamped and braked via the hub 15. Furthermore, when the electromagnetic coil 8 is excited, the armature 13 is attracted to the magnetic attraction surface 7a of the field core 7, and the braking of the motor shaft 2 is released.

The negative actuating electromagnetic brake constructed in this manner is provided with a manual release device generally designated by the reference numeral 20. In other words, a pair of support plates 21 are provided at locations that divide the circumferential surface of the field core into two equal parts in the circumferential direction.
are fixed with bolts, and each of these support plates 21
, both ends of a shifter 22 formed in a semicircular arc shape so as to cover a semicircumference of the side plate 10 are pivotally connected by support pins 23, respectively. By doing so, the shifter 22 is swung around the support pin 23 so that the center portion of the arc, which is the swiveling end, moves back and forth in a direction substantially parallel to the motor shaft 2. Reference numeral 24 denotes a headless bolt as a pressing member that is screwed into a screw hole of a bent portion 22a formed at both swing fulcrum portions of the shifter 22 so as to be adjustable in forward and backward movement and fixed with a nut 25. The headless bolt 24 is inserted between the side plate 10 and the bent piece 22a so as to be spaced apart from the armature 13. An elastic member 26 such as a disc spring or rubber is inserted to apply rotational force to the shifter 22 in the direction of movement. On the other hand, a guide 27 having a substantially elliptical circumferential guide surface 27a is integrally formed at the center of the semicircular arc, which is the swinging end of the shifter 22. A cam 30 with a handle 29 rotatably mounted on the cylindrical portion of the bolt 28 is engaged with the cam 30, and the handle 29 is moved approximately between the solid line position and the chain line position in FIG.
By rotating the cam 30 by 90 degrees, the guide 27 is configured to move between the solid line position and the chain line position. Then, as the guide 27 moves, the shifter 22 swings, and the headless bolt 24
moves back and forth to compress armature 13 and compress coil spring 1.
Advance and retreat in collaboration with 6. The cam 30 acts only when pushing the guide 27 to the chain line position, and the return to the solid line position is performed by the elastic member 26 provided on the headless bolt 24. Reference numeral 31 denotes a stopper that abuts the cam 30 to restrict the rotation limit of one side thereof.

The operation of the negative action type electromagnetic brake configured as above will be explained. When the electromagnetic coil 8 is de-energized, the elastic force of the compression coil spring 16 causes the armature 13 and the side plate 10 to rotate the disk 1.
4, and the motor shaft 2 is braked. When the electromagnetic coil 8 is excited from this state, the armature 13 is moved apart while compressing the compression coil spring 16 due to the magnetic flux φ, and is attracted to the magnetic attraction surface 7a of the field core 7, and the braking of the motor shaft 2 is released. .

To manually release the brake when the motor shaft 2 is braked, rotate the handle 29 from the solid line position in FIG. 3 to the chain line position.
The cam 30 rotates to the chain line position and pushes the guide 27, and the shifter 22 swings about the support pin 23, so the headless bolt 24 moves as shown in FIG. 3 while compressing the elastic member 26 with the bent piece 22a. Move in the direction of the arrow. As a result, the armature 13 pushed by the headless bolt 24 moves against the elastic force of the compression coil spring 16 and releases the disc 14 from the clamping pressure, so that the braking of the motor shaft 2 is released.

From this state, when the handle 29 is rotated to the solid line position and the cam 30 is returned to the solid line position, the guide 27 is released from the pressure of the cam 30, so the shifter 22 is moved to the support pin by the elastic force of the elastic member 26. 23 in the opposite direction, and the headless bolt 24 separates from the armature 13, so the motor shaft 2
is braked.

In such a manual release operation, the rotation range of the handle 29 is small, and the guide 27, which is the swinging end of the shifter 22, moves slightly along the circumferential surface of the field core 7 in a direction parallel to the motor shaft 2. Since it is only a single device, the operability is good and the space occupied by the device is reduced.

Note that the shapes of the shifter 22 and the handle 29, the configuration of the pressing member exemplified by the headless bolt 24, etc. are not limited to the configuration of this embodiment.

[Effect of idea]

As is clear from the above explanation, according to the present invention, in the manual release device for a negative actuating electromagnetic brake,
On each of the pair of support members on the outer peripheral side of the field core,
Each end of a semi-circular shifter whose swinging end is parallel to the braked shaft is pivoted so that it can swing freely. By fixing the opposing pressing members and providing a shifter swinging operation member that engages with the swinging end of the shifter, by operating this operating member, the shifter is moved so that the swinging end is parallel to the braked shaft. The brake can be released by simply moving the brake in the direction with a small stroke, compared to the conventional method in which the swing end swings the outside of the shaft end of the braked shaft in a direction perpendicular to the shaft center. The reduced movement greatly improves the operability, provides rapid manual release, and reduces the space occupied by the device, allowing the device to be small and compact.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the manual release device for a negative actuating electromagnetic brake according to the present invention, and
The figure shows a front view of a negative actuation type electromagnetic brake and a part of the motor, Figure 2 is a cross-sectional view along AA of Figure 1, and Figure 3 is a partial cross-section taken in the BB direction of Figure 1. FIG. 2 is a side view from C in FIG. 1; 1... Motor body, 2... Motor shaft, 5... Negative action type electromagnetic brake, 7... Field core, 7
a... Magnetic adsorption surface, 8... Electromagnetic coil, 10...
Side plate, 13... Armature, 14...
... Disk, 15 ... Hub, 16 ... Compression coil spring, 20 ... Manual release device, 21 ... Support plate,
22... Shifter, 23... Support pin, 24... Headless bolt, 26... Elastic member, 27... Guide,
28...Bolt, 29...Handle, 30...Cam.

Claims (1)

[Scope of utility model registration request] A field core has an electromagnetic coil installed therein, and is supported so as to be movable only in the axial direction with its plane facing the magnetic attraction surface of the field core. an armature that comes into contact with and separates from the magnetic attraction surface;
In a negative actuation type electromagnetic brake which is braked in response to the pressing force of the armature and is equipped with a braked shaft and a disc integrated in the rotating direction, each end is attached to each of the pair of support members on the outer peripheral side of the field core. a substantially semi-circular shifter which is pivotally supported so as to be freely swingable and whose swing operation direction of the swing end is substantially parallel to the braked shaft; a pressing member that is fixed to the armature and has a tip facing a plane on the opposite field core side of the armature; and an operating member that engages with a swinging end of the shifter and swings the shifter in a forward and backward direction of the pressing member. A manual release device for a negative actuating electromagnetic brake.