JPH066294Y2 - Electromagnetic brake - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a non-excitation actuated electromagnetic brake incorporated in, for example, a servomotor.

[Prior Art] Conventionally, the electromagnetic brakes shown in FIGS. 2 and 3 have been devised as non-excitation actuated electromagnetic brakes (Japanese Patent Application No. Sho 6).
0-58992).

In these figures, FIG. 2 shows line A-- in FIG.
FIG. 3 is a cross-sectional view taken along the line A ′, and FIG. 3 is a side view. In FIG. 3, reference numeral 1 denotes a brake drum, which is a hub portion that is an inner cylindrical portion, with the inner peripheral surface of the outer cylindrical portion serving as a braking surface. At, the braked shaft (not shown) is fitted. Reference numeral 2 denotes an annular electromagnet, which is composed of a yoke 3 opening toward the outer periphery and a coil 4 housed in a recess of the yoke 3. It is fixed. Reference numeral 6 is a lead wire for supplying a current to the coil 4, 7 is an arcuate armature divided into a plurality of pieces, and a bolt is attached to a fixing member 9 made of a non-magnetic material through a supporting member 8 such as a leaf spring at each end. Are mounted on the same circumference, facing the magnetic pole surface that is the outer peripheral surface of the yoke 3, and openable in the radial direction by the flexibility of the support member 8. Reference numeral 10 denotes a brake shoe screwed to the outer peripheral surface of the tip portion of each armature 7, the peripheral surface of which faces the inner peripheral surface of the drum 1. Reference numeral 11 is a liner for adjusting the gap length between the brake shoe 10 and the drum 1 when the brake is released, and is inserted between the armature 7 and the brake shoe 10. 12 is a coil spring for braking, which is a yoke 3
Are inserted into holes provided in the radial direction at equal intervals on the magnetic pole surface which is the peripheral surface of the drum, and pressing force is applied to each armature 7 by these springs 12, and each brake shoe 10 is attached to the inner peripheral surface of the drum 1. It is pressing.

In the above configuration, when no current is supplied to the coil 4, each armature 7 is pushed outward by the force of each spring 12, and the brake shoe 10 is pressed against the inner peripheral surface of the drum 1. The braked shaft connected thereto is braked, and when a current is supplied to the coil 4 in this state, the magnetic flux indicated by the broken line flows, and the armature 7 resists the force of the spring 12 and the yoke. 3, the brake shoes 10 are separated from the inner peripheral surface of the drum 1, and the braking of the braked shaft is released.

[Problems to be Solved by the Invention] In the conventional electromagnetic brake described above, there is a case where the braked shaft must be released without exciting the electromagnet 2 at the time of power failure or assembly. In such a case, the armature 7 not covered by the brake drum 1
Wrap a wire etc. around the outer peripheral part of and tighten it.
The armature 7 was pressed radially inward against the coil spring 12 to release the brake.

However, when the conventional electromagnetic brake is assembled inside a cylindrical object such as a servomotor, it becomes difficult to press the armature 7 in the radial direction, and the braked shaft cannot be released without exciting the electromagnet 2. It was

The present invention has been made in view of the above circumstances, and an object thereof is to provide a non-excitation actuated electromagnetic brake that can be easily manually released even when assembled in a cylindrical shape such as a servomotor. To do.

[Means for Solving the Problems] The present invention relates to a protruding member attached to the outer periphery of an armature, and a cylindrical member arranged so that the tip of the opening faces the protruding member and is movable in the axial direction. A release drum is provided, and either or both of the projecting member and the release drum are provided with a taper.

[Operation] According to the present invention, when releasing the electromagnet without exciting the electromagnet in the event of a power failure or the like, when the releasing drum is pushed in the axial direction, the tip end of the opening portion of the releasing drum contacts the protruding member,
When pushed further, the armature follows the taper and moves to the electromagnet with the brake shoe. As a result, the brake shoe is separated from the inner peripheral surface of the brake drum, and the brake can be released.

[Embodiment] FIG. 1 is a sectional view showing the structure of an embodiment of the present invention. In this figure, the same parts as those in FIG. 2 are designated by the same reference numerals, and the description thereof will be omitted. In this figure, 2
1 is a protruding member having a taper 21a formed on the outer periphery,
It is attached to the outer periphery of the right end of each armature 7 in the figure. Further, the taper 21 a of the projecting portion 21 is formed so as to project outward from the outer periphery of the brake drum 1.
On the other hand, reference numeral 22 is a cylindrical release drum having a diameter larger than that of the brake drum 1, and the opening end 22a faces the taper 21a of the protrusion 21. The sealing surface 2 of this release drum 22
A push screw 23 having a thread around it is rotatably attached to the center of 2b. The push screw 23 meshes with the female screw portion of the cover 24, and moves forward (arrow X direction) to the right (arrow Y direction) and reversely rotates (arrow Z direction) to the left (arrow W direction). ). A handle 25 is detachably attached to the left end of the push screw 23.
The push screw 23 is rotated by.

In the above configuration, in the event of a power failure, the electromagnet 2 is not excited and the armature 7 is biased toward the drum 1 by the biasing force of the coil spring 12, whereby the brake shoe 10 is pressed against the inner peripheral surface of the drum 1. As a result, the drum 1 is braked by the frictional force of the brake shoe 10 and the braked shaft is prevented from rotating.

If you want to rotate the braked shaft in this state, handle 2
When 5 is rotated forward in the direction of arrow X, the push screw 23 moves to the right (direction of arrow Y), and along with this, the release drum 22.
Moves to the right. Then, the tip end 22a of the opening portion of the release drum 22 contacts the taper 21a of the projecting member 21, the handle 25 is further rotated in the forward direction, and the release drum 22 is pushed rightward. Is pressed by the tip 22a of the opening. As a result, the armature 7 moves to the electromagnet 2 side together with the brake shoe 10 according to the inclination of the taper 21a. As a result, the brake shoe 10 separates from the drum 1, and the braked shaft is released.

Although the end portion of the cover 24 is not shown in FIG. 1, the cover 24 is configured to be attachable to and detachable from the frame of the device used, and the cover is provided when the release drum 22 is not used. It may be removed together with 24. Further, the cylindrical portion of the release drum 22 need not be a perfect cylinder, and may be formed so that only the portion that abuts the protruding member 21 exists. Further, although the taper 21a is formed on the projecting member 21 in the above-described embodiment, the taper may be provided on the release drum 22 side, or both may be provided. Further, in the above-described embodiment, the projecting member 21 and the release drum 22 directly contact each other, but a roller, a ball, or the like is interposed between them to reduce the contact friction between the projecting member 21 and the release drum 22. It may be possible to release a small force.

[Effect of the Invention] As described above, according to the present invention, the projecting member attached to the outer periphery of the armature and the projecting member are arranged such that the tips of the openings face each other and are movable in the axial direction. A cylindrical release drum is provided, and either or both of the protruding member and the release drum is provided with a taper, so by pushing the release drum in the axial direction,
It is possible to easily release the brake, and therefore, the effect that the brake can be easily released manually even when it is assembled in a cylinder such as a servomotor is obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing the constitution of an embodiment of the present invention, FIGS. 2 and 3 are diagrams showing the constitution of a conventional electromagnetic brake, and FIG. 2 is a line A--A in FIG. 3 is a side view, and FIG. 21 ... Projection member, 21a ... Tapered part, 22 ... Release drum, 23 ... Push screw, 25 ... Handle.

Claims (1)

[Scope of utility model registration request] 1. A cylindrical electromagnet having a magnetic pole surface formed on the outer peripheral side, an armature arranged along the magnetic pole surface of the electromagnet and biased radially outward, and attached to the outer periphery of the armature. An outer periphery of the armature, the electromagnetic brake comprising: a brake shoe, and a brake drum, which is attached so as to rotate integrally with the braked shaft and has a cylindrical portion with which the brake shoe is in pressure contact with the inner peripheral surface, And a cylindrical release drum arranged so that the tip of the opening faces the projection member and movably in the axial direction, the projecting member or the release drum, or Electromagnetic brake characterized by taper on both sides.