JPH10148227A - Non-excitation operated electromagnetic brake - Google Patents

Abstract

(57) [Summary] [Problem] A field core containing a coil for energization,
An armature slidably mounted in the axial direction by a coil spring; and a side plate, wherein the armature is guided by a collar interposed between the side plate and the field core. In the non-excitation operation type electromagnetic brake, the collar is originally in a free state, and the armature moves in the circumferential direction at the time of braking, so that a contact sound is generated upon contact, and further, the collar is caused by a strong impact force. In order to solve the problem that damage and deformation of the armature cause poor sliding of the armature. SOLUTION: A collar integrally molded rubber coating 21A is applied to the inner and outer peripheral surfaces of the collar 21.
In addition to applying the integrally molded rubber coating 21A to the inner and outer peripheral surfaces of the armature 1, the armature integrally molded rubber coating 22A is applied to the guide portion of the armature 22 by the collar 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION Non-excited electromagnetic brakes are often used for braking and holding a rotating shaft of a motor or a driven shaft of a joint body, which is a driving source of an industrial robot. Recently, users tend to dislike the generation of unpleasant sounds such as backlash sounds and crying sounds during braking.

[0002]

2. Description of the Related Art First, a conventional non-excited operation type electromagnetic brake will be described with reference to FIG. FIG. 2 is a sectional side view of a conventional non-excited operation type electromagnetic brake. In FIG. 2, an energizing coil 2 is housed in a field core 1.
The field core 1 is fixed to a stationary frame of the motor 3 or the like. Armature 4 and disk 5 slidable in the axial direction
The disk 5 is fitted with the hub 6, restricts the rotation direction, and is slidable in the axial direction. The side plate 7 is completely fixed to the field core 1 via a collar 8 with screws 9 or the like. A plurality of coil springs 10 are housed in the field core 1. The hub 6 restricts the rotation direction to the motor shaft 11 with a key 13, and is firmly fixed to the shaft via a retaining ring 12. A predetermined gap a is provided between the field core 1 and the armature 4 depending on the size of the collar 8. In the power-off state, the disc 5 is moved from the side plate 7 via the armature 4 by the pressing force of the plurality of coil springs 10 housed in the field core 1.
Press The disk 5 generates a torque due to the frictional force of the contact surface between the armature 4 and the side plate 7, and enters a braking state. Next, when the energizing coil 2 is energized, a magnetic circuit Φ is formed between the field core 1 and the armature 4 as shown in the figure, and a magnetic attractive force is generated, which overcomes the pressing force of the coil spring 10 and the armature 4
Is adsorbed to the field core 1 and the gap a becomes zero.

[0003]

However, in the conventional non-excited operation type electromagnetic brake shown in FIG.
Is originally in a free state, and the armature 4 moves in the circumferential direction at the time of brake braking, so that there is a problem that a contact sound is generated due to the contact, and further, the collar 8 is damaged and deformed by a strong impact force. There is a problem that it causes a sliding failure of the armature 4.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a field core containing an energizing coil, an armature slidably mounted in an axial direction by a coil spring, and a side plate. Wherein the armature is guided by a collar interposed between the side plate and the field core.
As a second aspect of the present invention, there is provided a non-excited operation type electromagnetic brake in which an inner and outer peripheral surface of the collar is provided with a rubber integrally molded rubber coating. It is another object of the present invention to provide a non-excited operation type electromagnetic brake in which a guide portion of the armature by the collar is provided with an armature integrally molded rubber coating. Thereby, at the time of braking, the armature and the collar come into contact with each other via the rubber, so that the contact sound and the strong impact force are suppressed by the damping effect of the rubber.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a non-excited operation type electromagnetic brake according to the present invention will be described below with reference to FIGS. FIGS. 1A and 1B show an embodiment of an armature and a collar incorporated in a non-excited operation type electromagnetic brake according to the present invention, wherein FIG. 1A is a cross-sectional side view of a portion where a collar is incorporated, and FIG. (A) is a cross-sectional front view of the collar, (C) is a cross-sectional side view of a part in which the armature is incorporated, (D) is a partial cross-sectional front view of the armature of (C), and FIG. FIG. 3 is a cross-sectional side view of a conventional non-excitation operation type electromagnetic brake. First, referring to FIG. 2, the present invention includes a field core 1 housing a current-carrying coil 2, an armature 4 slidably mounted in an axial direction by a coil spring 10, and a side plate 7, The armature 4 is guided by a collar 8 interposed between the side plate 7 and the field core 1. Next, referring to FIGS. 1 (A) and 1 (B), a non-excited operation type electromagnetic brake according to a first aspect of the present invention includes a collar integrally molded rubber coating 21A on the inner and outer peripheral surfaces of the collar 21. It has been applied. Next, a non-excited operation type electromagnetic brake according to a second aspect of the present invention will be described with reference to FIGS.
, A collar-integrated rubber coating 21A is applied to the inner and outer peripheral surfaces of the collar 21 and an armature-integrated rubber coating 22A is applied to a guide portion of the armature 22 by the collar 21. . Therefore, according to the first aspect of the invention, the collar 21 is provided with the collar integrally molded rubber coating 21A on the inner and outer peripheral surfaces thereof.
According to the second aspect of the present invention, a collar-integrated rubber coating 21A and an armature-integrated rubber coating 22A are applied to the inner and outer peripheral surfaces of the collar 21 and the guide portion of the armature 22, respectively. Collides with each other, thus preventing wear.

[0006]

As described above, in the non-excited operation type electromagnetic brake according to the present invention, since the contact portion of the collar and the armature is provided with the integrally formed rubber coating, the vibration at the time of braking is suppressed by the rubber damping effect. Thus, damage due to contact noise and impact force is prevented.

[Brief description of the drawings]

1A and 1B show an embodiment of an armature and a collar incorporated in a non-excited operation type electromagnetic brake according to the present invention, wherein FIG. 1A is a cross-sectional side view of a part where a collar is incorporated, and FIG. (C) is a sectional side view of a part in which an armature is incorporated, and (D) is a partial sectional front view of the armature of (C).

FIG. 2 is a cross-sectional side view of a conventional non-excited operation type electromagnetic brake.

[Explanation of symbols]

 1: field core 2: energizing coil 3: motor 4: armature 5: disk 6: hub 7: side plate 8: collar (three places) 9: screw 10: coil spring 11: motor shaft 12: retaining ring 13: key 21: Collar 21A: Collar-integrated rubber coating 22: Armature 22A: Armature-integrated rubber coating

Claims (2)

[Claims] 1. A field core containing an energizing coil, an armature slidably mounted in an axial direction by a coil spring, and a side plate, wherein the armature is provided between the side plate and the field core. A non-excited operation type electromagnetic brake adapted to be guided by a collar interposed therein, wherein a collar-integrated molded rubber coating is applied to the inner and outer peripheral surfaces of the collar. brake. 2. A field core containing an energizing coil, an armature slidably mounted in an axial direction by a coil spring, and a side plate, wherein the armature is provided between the side plate and the field core. In a non-excitation type electromagnetic brake adapted to be guided by a collar interposed in the armature, a rubber integrally molded rubber coating is applied to the inner and outer peripheral surfaces of the collar, and a guide portion of the armature by the collar is provided. A non-excited operation type electromagnetic brake having an armature integrally molded rubber coating.