JPH0317073Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an electromagnetic brake that is attached to the driven shaft of various electrical devices using an electric motor as a drive source. This type of electromagnetic brake is a type of electromagnetic brake that is braked by an electromagnetic force and released by an electromagnetic force, and is also called an excitation release type or an electromagnetic brake that is braked by an electromagnetic force. be.

(Prior Art) Like hydraulic brakes used in automobiles, electromagnetic brakes can be broadly classified into two types: disc brakes and drum type brakes (or shoe type brakes).

Additionally, when a disc-type brake is installed on the motor, the manual brake release device is normally installed at the center of the brake shaft, but if the release device is installed at the center of the shaft, the motor shaft will extend to the outside of the brake. It was difficult to do so.

In order to solve these problems, the following improvements have been proposed and made known in Japanese Patent Publication No. 56-53131.

In this prior art, as shown in FIG. 5, an outer fan 22 is fixed to the opposite end of the shaft 33 of the motor body 21, and an electromagnetic core 23 is attached to the fixed core 23 supported by a bearing bracket 37 on the same side. A coil 24 and a brake spring 25 are provided. This braking spring 25 presses against the movable core 27, which moves while being guided by a pin 26 implanted in the fixed core 23.
A magnetic gap G is formed between the movable iron core 27 and the movable iron core 27. The movable iron core 27 rotates together with the center hub 32 to press the inner disk 29 against the outer disk 30 and the brake plate 31.

In this brake, the above-mentioned bearing bracket 37
The eccentric pin 34 is fitted into a pair of holes provided at radially symmetrical positions, and the eccentric pin 34 is inserted into the handle 3.
6 is rotated to move the movable core 27 against the force of the brake spring 25 and release the brake.

Although this known technique is an improvement over the previous technique in that it is possible to manually release the brake from the outer periphery, it requires two eccentric pins 34, which are difficult to machine, and a bearing that engages with the two eccentric pins 34 to operate. A bracket 37 is required, and it is impossible to simply attach it to an existing brake unit.

(Means for Solving the Problems) In consideration of the above problems, the present invention provides a small number of electromagnetic brakes that have a simple structure and can be additionally attached by methods such as welding or screwing. This problem was solved by adopting a structure that allows manual release by simply installing an additional member. Two new parts will be added: a handle that can be formed by simply bending a bar into a semicircular or U-shape and forging or pressing a portion, and an arm that will be attached to the outer periphery of the armature by welding or screwing. By simply preparing the brake, the function can be improved as an electromagnetic brake equipped with a manual release device.

(Example 1) Figure 1A is a perspective view of an embodiment of the present invention, Figure 1B
1 is a perspective view of the tip of the handle, Figures 1C and 1D are positional relationship diagrams of the hole or groove of the armature arm and the handle protrusion, and Figure 2 is a side sectional view showing the internal structure of Figure 1A. It is.

In order to facilitate understanding, the internal structure of FIG. 2 will be explained. As already mentioned, this internal structure is the same as that of the above-mentioned Japanese Patent Application No. 13908/1983.
In FIG. 2, 3 is an armature with one side facing the magnetic pole surface of the yoke 1 with a required magnetic gap in between, and 5 is an armature that is based on the spring force of the braking spring 10 applied to this armature. This is an annular plate for compressing the brake disc 8 together with the armature 3.

12 is a magnetic gap adjustment bolt screwed into the yoke 1 and supports the armature at the intermediate portion and the annular plate 8 at a portion near the outer periphery; 14 is screwed onto this bolt for positioning the plate and supporting the bolt. It is a nut that also serves as a rotation stopper.

Reference numeral 2 denotes an excitation coil provided in the groove of the yoke 1.

In FIGS. 1A to 1D, 1 is a yoke, 1a is a small hole bored in the radial direction at a radially symmetrical position, and the tip 15b of the handle 15 [see FIG. 1B]
Rotatably supported. 3 is armature, 3
The arm a is attached as an extension of the armature to connect the armature and the yoke 1 at the small hole 1a of the yoke, and after being extended in the radial direction from the outer periphery of the armature, the arm a is attached along the outer periphery of the yoke. It is bent parallel to the axis of the rotating shaft in a direction opposite to the pressing force of the brake spring 10 (to the left in the drawing).

An elongated hole 3b is formed in the arm 3a at a position corresponding to the small hole 1a, which is formed in an intermediate portion near both ends of the handle 15 to receive the protrusion 15a.

The center of this circular hole 3b is placed on the right side in the figure with respect to the center of the small hole 1a into which the tip 15b of the handle 15 is fitted, that is, on the braking side.
It is eccentric to the small hole 1a. Also, the protrusion 15a
The length of is shorter than the diameter of the circular hole 3b, and one end (the upper end in the figure) is in contact with the left inner periphery of the circular hole under a spring force. When the handle is rotated in the direction of arrow X, the protrusion 15a moves the arm to the left and releases the brake. Of course, an elliptical groove may be used instead of the circular hole.

When the handle 15 is in the positions A and C in FIG. 1, the armature 3 is pushed by the brake spring 10 (see FIG. 2), and the circular hole 3b is angled toward the right in the figure relative to the handle protrusion 15a. When the handle 15 is pulled together and operates as a normal electromagnetic brake, when the handle 15 is manually rotated in the direction of arrow
As the wall of the elongated hole 3b is pushed as shown in , the armature 3 moves in the direction of arrow a, that is, toward the yoke 1, and the disk 8 and hub 9 are released from braking and can rotate freely.

In this way, the only members necessary to add the manual opening function are the handle 15 and the arm 3a attached to the outer periphery of the armature 3.

The handle 15 is a round bar made of metal or the like, shaped into a semicircle or U.
The arm 3a can be easily bent into a shape and the protruding part can be manufactured by forging or pressing, and the arm 3a can be easily attached to the outer periphery of the armature 3 by welding or screwing.

(Embodiment 2) FIG. 3 is a side sectional view showing the upper half of another embodiment of the present invention, which shows that a small hole 1a for receiving a handle 15 is formed on the outer periphery of the yoke 1.
The handle 15 itself is the same as in Example 1, but
Instead of the annular plate 5, a hub 9 extends radially outwards to a position corresponding to the outer end of the excitation coil 2. A brake disc 8 is attached either to the axially inner side of the radially outer end of the hub 9 or to the side of the armature 3 facing this part of the hub 9, and the brake disc 8 is attached to the outer end of the hub 9 and the armature 3. Braking is performed by jointly sandwiching and tightening the brake disc 8 with the side surfaces of the brake disc 8.

In place of the bolt 12 of the first embodiment, a pin 16 is inserted through the armature 3 and into the outer end of the yoke 1 to receive the torque of the armature 3.

In this embodiment, in the event of a power outage, the armature 3 is
is pressed against the hub 9 and braked by frictional force.

When energized, the armature 3 separates from the hub 9 due to electromagnetic attractive force, allowing it to rotate freely.

The manual opening operation is the same as in the first embodiment, so the explanation will be omitted.

(Embodiment 3) Fig. 4 is a side sectional view showing the upper half of the third embodiment of the present invention, showing the yoke 1, the excitation coil 2, the armature 3, the arm 3a, and the hole or groove made in the arm. 3b, annular plate 5, brake disc 8, hub 9, and brake spring 10, the structure is the same as in the first embodiment. This embodiment is different in that a small hole 1a for rotatably supporting the free end of the handle 15 is opened radially inward from the radially outer end surface of the annular plate 5.

Unlike the yoke 1, the annular plate 5 does not need to accommodate an excitation coil or a brake spring therein, so there are few restrictions on where to make small holes, which is advantageous in manufacturing.

Embodiment 1 shows the operation in case of power outage, energization, and manual release.
and 2, so the explanation will be omitted.

(Effects) In this way, a manual release device can be attached by simply preparing a handle and arm that are easy to manufacture and install, making a great contribution to this field.

[Brief explanation of the drawing]

FIG. 1A is a perspective view showing an embodiment of the present invention;
Figure B is a perspective view of the tip of the handle, Figures 1C and D are positional relationship diagrams between the hole or groove of the armature arm and the protrusion of the handle, and Figure 2 is a side view showing the internal structure of the electromagnetic brake of the present invention. 3 is a side sectional view showing the upper half of the second embodiment of the present invention; FIG. 4 is a side sectional view showing the upper half of the third embodiment of the present invention; The figure is a sectional view of an electromagnetic brake with a manual release device according to the prior art. Symbols in the drawings: 1: Yoke, 1a: Small hole, 2:
Excitation coil, 3: armature, 3a: arm,
3b: hole, 5: annular plate, 8: brake disc, 9: hub, 10: braking spring, 12: magnetic gap adjustment bolt, 14: nut, 15: handle,
15a: Handle protrusion, 15b: Handle tip, 16: Pin.

Claims (1)

[Claims for Utility Model Registration] (1) An armature whose one side faces the magnetic pole face of a stationary member such as a yoke across a magnetic gap; In a disk type excitation release type electromagnetic brake comprising a clamping member that clamps in the axial direction in cooperation with the armature; a pair of small holes provided at radially symmetrical positions in the stationary member; an arm bent axially along the outer periphery of the yoke in a direction opposite to the spring force as an extension of the armature; a radially perforated circular hole or groove; a handle having a semicircular or U-shaped overall shape, the radius of which is substantially greater than the radius of the stationary member, and whose open ends are connected to the stationary member; is bent at right angles in the radial direction toward the surface of the handle body, and has a protrusion in the middle of the bent portion, the rotation radius of which is larger than the diameter of the bar constituting the handle body, and the tip portion is bent at right angles in the radial direction. The handle is inserted into a small hole of the stationary member, and one end of the protrusion is slidably inserted into the circular hole or groove of the arm by the force of the spring. The armature is manually released from the braking position by rotating the armature from the braking position in a direction parallel to the axis of the brake about the tip inserted into the small hole of the stationary member. Manual release device for electromagnetic brakes. (2) Utility model registration In the manual release device according to claim 1, the stationary member is a yoke, and the clamping member is an annular ring disposed outside the brake disk in the axial direction. Manual brake release device. (3) Utility Model Registration In the manual release device according to claim 1, the stationary member is a yoke, and the center hub is extended radially outward to a position corresponding to the outer end of the excitation coil. hand,
A manual release device for an electromagnetic brake in which that portion is used as a narrow pressure member, and a brake disc is attached to one of the members between the armature and the pressure member. (4) Utility model registration In the manual release device according to claim 1, the stationary member is an annular plate serving as a pressing member located on the opposite side of the armature in the axial direction with respect to the brake disc, A manual release device for an electromagnetic brake, wherein the small hole for inserting the tip of the handle is formed on the radially outer end surface of the device.