JPS58124834A - Electromagnetic brake of motor - Google Patents

Abstract

PURPOSE:To prevent the colliding noise generated in a brake lining by inserting and holding an elastic body into a free socket space between the brake lining and a hub. CONSTITUTION:A brake lining 14 is pressed constantly by compression springs 22a and 22b in a direction from the center of a rotary shaft 10 toward a crossing point between two side surfaces 18a and 18b of a hub 12. Thus the brake lining 14 is held afround the hub 12 in such a state that the internal surface of the brake lining 14 is pressed tight against the two side surfaces of the hub 12 other than adjacent two side surfaces 18a and 18b of the hub 12. In other words, it is consitituted such that the brake lining 14 will not oscillate around the hub 12 even if a torque pulsation occurs on the rotary shaft during motor operation, and if the oscillation of the lining 14 should occur it may be damped in its intensity.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnetic brake for an electric motor, and more particularly to an electromagnetic brake that prevents unpleasant noises that often occur in the brake section of an electric motor.

Conventionally, electromagnetic brakes have been widely used in the brake parts of single-phase induction motors, motors whose frequency is controlled using an inverter, and the like. This electromagnetic brake includes a hub that is integrally fixed to the rotating shaft of the electric motor, a brake lining loosely fitted and supported by the hub, and a movable brake lining that is disposed opposite to the front end surface of the brake lining so as to be able to move toward and away from the hub. iron core and
A fixed iron core that has an excitation coil that absorbs the movable iron core arranged opposite to this movable iron core and releases the pressing force of the brake plate in the brake lining direction, and a brake plate that has the movable iron core installed between the fixed iron cores. It is equipped with a braking spring that presses in the direction of the brake lining, and there is a slight gap between the inner surface of the brake lining and the circumference of the hub, which is integrally fixed to the rotating shaft, so that the brake lining can be moved along the side of the hub. It is configured to be able to slide smoothly in the direction of the rotation axis.

However, if there is torque pulsation in the rotation of the rotating shaft of the electric motor during low-speed operation, etc., there is a gap between the outer surface of the hub of the electromagnetic brake and the inner surface of the brake lining, so the brake lining may be damaged during operation of the electric motor. Experiments have confirmed that the brake lining dances around the hub and collides with the outer surface of the hub and other structural parts of the motor, causing an unpleasant noise.

The present invention has been made in view of the above-mentioned conventional problem, and its purpose is to mechanically eliminate the gap between the hub and the brake lining, and to reduce the impact of the rotational torque pulsation of the rotating shaft of the electric motor. To provide an electromagnetic brake for an electric motor which prevents the generation of unpleasant collision noise of the brake lining during operation of the electric motor by quickly attenuating the dancing of the brake lining.

In order to achieve the above object, the present invention provides a brake lining that is loosely fitted and supported by a hub fixed to a rotating shaft, a brake plate that is disposed opposite to the front end surface of the brake lining so as to be able to move toward and away from the brake lining, A movable iron core fixed to this brake plate, a fixed iron core having an excitation coil disposed opposite to this movable iron core to absorb the movable iron core and release the pressing force of the brake plate in the brake lining direction, and a movable iron core. In an electromagnetic brake for an electric motor, which consists of a brake spring that presses a brake plate attached between a fixed iron core and a brake plate in the direction of the brake lining, an elastic body is inserted and clamped over the loose fitting space between the brake lining and the knob. It is characterized by

In the present invention, the hub fixedly attached to the rotating shaft has a rectangular cross-sectional shape in a direction perpendicular to the center line of the rotating shaft,
It is preferable to use a compression coil spring as an elastic body to insert and sandwich the compression coil spring between any two adjacent sides of the l/p having a rectangular cross section and the inner surface of the brake lining. The compression coil spring is inserted into the quadrant of the two-wheel orthogonal axes where the two sides of the I-B intersect, with the origin being the center line of the rotating shaft parallel to the outer surface of the square-shaped 7-P. It is preferable that a compression coil spring be inserted and held in the idle iF space between the hub and the second brake in the adjacent quadrant.

Preferred embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows a preferred embodiment of an electromagnetic brake for an electric motor according to the present invention. i and o are the rotating shafts of the electric motor,
A hub 12 having a rectangular cross section is integrally fixed to the rotation axis lO, and a large disk-shaped brake lining 14 is attached around the square knob 12. The brake lining 14 and the circumference of the nozzle 12 are slidable along the outer surface in the direction of the central axis of the rotating shaft 10.
It is loosely fitted and supported with a slight gap 16 between it and the inner surface of the holder.

A feature of the present invention is that an elastic body is inserted and held in the loose fitting space between the outer peripheral surface of the knob 12 and the inner surface of the brake lining 14. That is, cutouts 201L and 20m) each having a U-shaped cross section are formed on the inner surface of the brake lining 14 facing the two adjacent sides 18& and 18b of the above-mentioned rectangular cross section. Compression coil springs 221L and 22b are inserted and held in loose fitting spaces between the bottom surfaces of these notches 201L and 2Qb and the outer surfaces of two adjacent sides 181L and 18kl of the hub 12, The brake lining 14 constantly receives the elastic force of the compression coil springs 221L and 22b and rotates around the rotation axis]0
The intersection of the two adjacent sides 18a and 181) of the hub 12 is pressed in the desired direction from the central axis of the hub 12.
The brake lining 14 is held around the hub 12 with the inner surface of the brake lining 14 firmly pressed against the other two sides of the hub 12 other than the two adjacent sides 18& and 181), and the motor is not operated. Even if torque pulsations occur on the rotating shaft during the brake lining 14
The brake lining 14 is configured so that the movement of the brake lining 14 is attenuated at an early stage even if the brake lining 14 moves around the area.

In the above embodiment, the brake lining 14 and...
Compression coil springs 22a and 22b are used as the elastic bodies inserted and held in the free space between 2, but other elastic bodies may be used. However, the brake lining 14 that uses a compression coil spring as the elastic body is better because the brake lining 14 can be applied to the outer surface of the hub 12 and can slide smoothly in the direction of the central axis of the rotation axis lO without being affected by the elastic body. It can maintain almost the same braking force as a brake.

Further, when the electromagnetic brake is installed, the electromagnetic brake can be easily assembled by compressing the compression coil spring to shorten the overall length and inserting and clamping it into the loosely fitting space between the brake lining 14 and the hub 12.

The elastic bodies such as the compression coil springs 22a and 221) can be inserted and clamped into any loose fitting space between the brake lining 14 and any two adjacent sides 181L and 18b of the hub 12. However, it is also possible to use a compression coil spring based on two orthogonal axes (orthogonal axes indicated by chain dots in the figure) whose origin is the center line of the rotating shaft 12 that is parallel to the outer surface of the hub 12, which has a square cross section. 225L and 22b
It is located in the quadrant adjacent to the quadrant of the orthogonal axis of the two wheels, where the two sides of the knob 12 intersect with each other to insert and hold the elastic body.
If the compression coil springs 221L and 22b are inserted and held in the loose fitting space between the brake lining 14 and the brake lining 14, the two compression coil springs 22& and zzb
Rotational moments in opposite directions are generated in the brake lining 14 through the hub 12 around the rotation axis lO under the influence of the elastic force of , even if rotational torque pulsations occur on the rotating shaft of the electric motor, the brake lining 14
1 can be completely prevented from dancing around the brake, and the effect of preventing abnormal noise caused by torque pulsation of the electromagnetic brake can be enhanced.

As described above, according to the present invention, even if torque pulsation occurs on the rotating shaft during operation of the electric motor, the brake lining of the electromagnetic brake will not dance around the knob and collide with other structural parts of the electric motor. This prevents unpleasant brake lining collision noise from occurring during braking of the electric motor.

Furthermore, the electromagnetic brake for the electric motor according to the present invention has almost the same braking function and mechanical strength as conventional electromagnetic brakes, and also has a simple structure when assembling the electromagnetic brake. It has the advantage that it can be assembled and configured easily and quickly in the same way as conventional electromagnetic brakes.

[Brief explanation of drawings]

FIG. 1 is a front view of the vicinity of a brake lining of an electromagnetic brake of an electric motor according to the present invention. 10 is the rotating shaft, 12 is the knob 1, 14 is the brake lining, 221 and 2
2m) is the compression coil/<ne. Agent: Patent attorney Makoto Kuzuno - (and 1 other person) Figure 1 Procedural amendment (voluntary) ↑, Mr. Commissioner of the Japan License Agency 1, Indication of case: Patent application No. 57-007234 2, Title of invention: Electromagnetic brake for electric motor 3. Relationship with the case of the person making the amendment To Hitoshi Katayama, representative of the patent applicant, Department 4, Agent address: 2-2-3-5, Marunouchi 2-chome, Chiyoda-ku, Tokyo, detailed description of the invention in the specification subject to amendment. Column and drawing 6, contents of amendment (1) [Movable iron core arranged,
" should be corrected to "The brake plate provided and the movable iron core fixed to the brake plate." (2) In lines 7 to 8 of page 3 of the specification, [between the movable core and the fixed core] is corrected to "between the movable core and the fixed core." (3) Correct "1 rotational axis 12" on page 8, line 12 of the specification to "rotation axis 10j." (4) Correct "during braking" on page 9, line 13 of the specification to "during operation J
Correct to. (5) Figure 1 is corrected as shown in the attached sheet. Above Figure 1

Claims (1)

[Claims] (Seal) A brake lining supported loosely on a hub fixed to a rotating shaft, and a front end surface K of this brake lining.
A brake plate disposed facing each other so as to be able to freely engage with each other, a movable iron core fixed to this brake plate, and a movable iron core disposed opposite to this movable iron core are attracted to push the brake plate in the direction of the brake lining. In an electromagnetic brake for an electric motor, which consists of a fixed core with an excitation coil that releases pressure and a brake spring that presses a brake plate installed between the movable core and the fixed core in the direction of the brake lining, loose fit between the brake lining and the hub An electromagnetic brake for an electric motor, characterized in that an elastic body is inserted and clamped in a part space. (2. In the electromagnetic brake described in claim (1), the hub fixed to the rotating shaft has a rectangular cross-sectional shape in a direction perpendicular to the center line of the rotating shaft, and is compressed into an elastic body. An electromagnetic brake for an electric motor, characterized in that a compression coil spring is inserted between two adjacent sides of a hub having a square cross section and an inner side of a brake lining using a coil spring. (3) Claims In the electromagnetic brake described in item (2), the two side surfaces of the hub into which the compression coil spring is inserted and clamped intersect with respect to two orthogonal axes whose origin is the center line of the rotating shaft parallel to the outer surface of the hub having a square cross section. An electromagnetic brake for an electric motor, characterized in that a compression coil spring is inserted and held in a loose fitting space between a hub and a brake lining in a quadrant adjacent to the quadrant of the two orthogonal axes.