JPH0261657B2 - - Google Patents

Abstract

PURPOSE:To facilitate fixing of an electromagnetic brake to the machine frame of machine to be braked by fixing a field core through a rotation stopper to the machine frame of machine to be braked while securing the boss section of disc through a set screw to the shaft to be braked. CONSTITUTION:A central hole 202a for inserting the shaft S to be braked is made in the boss section 2a to be coupled to the disc 2 of electromagnetic brake while a pin 16 having head for preventing rotation is provided at the machine frame F side of machine to be braked in the field core 5 to be supported through a bearing 12 onto the boss section 2a. When providing a rotation stopping member 15 for engaging said pin 16 to the machine frame F of the machine to be braked while providing a set collar 18 having a set screw 19 on the shaft S to be braked, the electromagnetic brake can be fixed easily.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention provides a braking state in which the armature, which is detachably supported on the field core, is separated from the field core by an elastic member; This invention relates to a negative actuation type electromagnetic brake in which the braking release state is a state in which the armature is magnetically attracted to the core side.

[Conventional technology]

In general, this type of device is installed on a machine to be braked, such as a motor or a speed reducer, and plays the role of braking the shaft to be braked installed on the machine to be braked. For example, a negative actuation type electromagnetic brake shown in FIG. 2 is known.

As shown in the figure, this electromagnetic brake is provided with a machine frame F of a machine to be braked, and a bearing 1 that protrudes from this machine frame F.
2 is attached to the braked shaft S which is supported so as to be freely rotatable with respect to the machine frame F, and 2 is fitted with a key to the tip of the braked shaft S. It is a disk that is mounted on a shaft by a screwed rotation prevention plate 3 and a bolt 4, and this disk 2
is a boss portion 2a that is key-fitted to the braked shaft S.
and a disk-shaped flange portion 2b extending in the radial direction from the boss portion 2a, the cross section of which is L.
It is formed to have a letter shape.

A field core 5 has an electromagnetic coil 6 built therein, and is fixed to the machine frame F by a coupling means such as a bolt (not shown).

7 is a predetermined gap G between the field core 5
The armature 7 is directly opposed to the field core 5 with a guide pin 8 fixed to the field core 5.
It is provided to be movable only in the axial direction between the field core 5 and the flange portion 2b of the disk 2.

Reference numeral 9 denotes a compression coil spring disposed between the bottom of the bottomed hole formed in the field core 5 and the side surface of the armature 7, which always keeps the armature 7 on the flange portion 2b side of the disk 2. It's pressing.

10 is a lining, and this lining 10
is fixed to either the flange portion 2b of the disk 2 or the armature 7.

In an electromagnetic brake having such a configuration, the armature 7, which is normally subjected to the pressing force of the compression coil spring 9, is connected to the lining 1 as shown in the figure.
0 to the flange portion 2b side of the disk 2, the braked shaft S is braked by the frictional engagement force between these members, and on the other hand, the electromagnetic coil 6
The magnetic flux generated by applying a voltage to
The armature 7 is magnetically attracted to the field core 5 against the pressing force of the compression coil spring 9, thereby releasing the braking on the braked shaft S.

[Problem that the invention seeks to solve]

In the electromagnetic brake described above, the field core 5 is directly and closely fixed to the machine frame F of the machine to be braked, and the gap between the field core 5 and the armature 7 that directly opposes it is defined by the rotation prevention plate 3. Since it is configured to be obtained by moving the disk 7 based on the degree of screwing in,
There is no so-called design freedom in mounting this type of device on a machine to be braked, and due to the above-described configuration, the pressing force of the compression coil spring 9 is limited to the armature 7.
→The lining 10→The disc 2 acts as a thrust load on the braked shaft S of the braked machine, so the service life of the bearing 1 that supports this braked shaft S and also of the braked machine to which this electromagnetic brake is installed is extended. There was a problem with the shortening of the term.

[Means for solving problems]

In view of the above-mentioned problems, it is an object of the present invention to provide a negatively operated electromagnetic brake that reduces the thrust load on the shaft to be braked. A disk consisting of a boss portion to be mounted and a flange portion extending radially from the boss portion, supported on the outer periphery of the boss portion of the disk via a bearing, and connected to the machine frame of the machine to be braked. A field core with a built-in electromagnetic coil is disposed between the flange portion of the disk and spaced apart from the machine frame and the flange portion, and a guide member fixed to the field core allows the field core to be An armature that is movable in the axial direction between the core and the flange of the disk, an elastic member that presses the armature toward the flange of the disk, and a rotation preventing member that keeps the field core immobile in the rotational direction. and a fixing member for fixing the boss portion of the disk to the braked shaft.

〔Example〕

Next, the negative actuation type electromagnetic brake of the present invention will be explained by way of embodiments with reference to the drawings.

FIG. 1 is a longitudinal sectional side view showing an example of a negative operation type electromagnetic brake according to the present invention, and in this figure,
Components that are the same as those constituting the conventional electromagnetic brake shown in FIG. 2 are given the same reference numerals as those already used.

In this illustrated electromagnetic brake, a positioning protrusion 201a is provided protrudingly provided on the upper end surface of the center line of a boss portion 2a that is mounted on a braked shaft S of a braked machine.
, the center hole 20 of the flange portion 2b made of an annular plate.
1b and by connecting these two members with screws 11, a disk 2 consisting of a boss portion 2a and a flange portion 2b extending radially from the boss portion is formed. .

The boss portion 2a includes a bottomed center hole 202a into which the braked shaft S is fitted, and a screw hole 203a into which a set screw 19, which will be a part of the fixing member of the device described later, is screwed. On the other hand, on its outer periphery, a stepped portion 204a that serves as a stopper portion when the bearing 12 is fitted, which will be described later, and a retaining groove 205a for the snap ring 13 as a stopper for fixing the bearing 12 are formed. There is.

In this embodiment, the boss portion 2a and the flange portion 2b are combined as described above to form the disk 2, but instead, the disk 2 is formed between the end surface of the boss portion 2a and the end surface of the flange portion 2b. In order to adjust the gap formed when the armature 7 is separated from the field core 5, which will be described later, a shim (not shown) or the like is interposed between the boss portion 2a.
The boss portion 2a and the flange portion 2b may be integrally connected by screws 11, or the boss portion 2a and the flange portion 2b may be integrally formed into a single L-shaped member from the beginning. , it goes without saying that the disk 2 may also be formed.

A field core 5 having a built-in electromagnetic coil 6 is supported on the outer periphery of the boss portion 2a via the bearings 12, 12, and this field core 5 is connected to the disk 2 by snap springs 13, 14.
is fixed.

The field core 5 has, for example, a knurled guide pin 8, which serves as a guide member that allows movement of an armature 7 (to be described later) freely in the axial direction, that is press-fitted into the field core 5. A plurality of bottomed holes 5a are arranged, and a plurality of bottomed holes 5b are formed, for example, arranged at three equal angles on the same circumference, into which compression coil springs 9 as elastic members to be described later are inserted. There is. The field core 5 has a stepped portion 5c that serves as a stopper portion of the bearing 12, a retaining groove 5d of the snap ring 14, and a neck portion of a headed pin 16 that is a constituent member of the detent member 15, which will be described later. A bottomed hole 5e for press-fitting and fixing is formed.

An armature 7 is disposed between the field core 5 and the flange portion of the disk 2 so as to directly face the field core 5 across a gap G during braking. In this armature 7, a plurality of through holes (of course, notches can also be used) 7a formed at three equal angles on the same circumference, for example,
The guide pin 8 fixed to the field core 5
An annular lining 10 is fixed to a stepped portion 7b formed near the outer periphery of the side surface of the armature 7 facing the flange portion 2b of the disk 2, into which the protruding portion of the armature 7 is inserted. is the bottomed hole 5 of the field core 5
The lining 10 is brought into pressure contact with the flange portion 2b of the disk 2 by receiving the pressing force of a compression coil spring 9 disposed between the bottom of the armature 7 and the surface of the armature 7 facing the field core 5. ing.

The field core 5 includes a headed pin 16 whose neck is press-fitted and fixed into the bottomed hole 5e of the field core 5, and a headed pin 16 which is fixed to the machine frame F of the machine to be braked and the head of the headed pin 16. Hole 1 into which is inserted
Rotation is prevented by a rotation prevention member 15 comprising a rotation prevention plate 17 having a rotation prevention plate 7a formed thereon.

The electromagnetic brake configured as described above is installed in the hole 1 of the detent plate 17 fixed to the machine frame F of the machine to be braked.
After fitting the boss part 2a of the disk 2 to the braked shaft S with the head of the headed pin 16 inserted into the head part 7a, the boss part 2a is fixed with a set collar 18 and a set screw 19 as fixing members. It is attached to the machine to be braked by mounting it on the shaft to be braked.

In this electromagnetic brake, normally, as shown in the figure, a compression coil spring 9 presses the armature 7 toward the flange portion 2b of the disk 2 to frictionally engage the flange portion 2b and the lining 10.
When the braked shaft S is braked and a voltage is applied to the electromagnetic coil 6 to generate magnetic flux, the armature 7
is magnetically attracted to the field core 5 against the pressing force of the electromagnetic coil spring 9, whereby the frictional engagement is released and the braking of the braked shaft S is released.

[Action of the invention]

Further, in the negative actuation type electromagnetic brake according to the present invention having the structure of the above embodiment, the field core 5 is attached to the machine frame F of the machine to be braked via the anti-rotation member 15, and the set collar 18 and the set screw 19 are used to attach the field core 5 to the machine frame F of the machine to be braked. Boss portion 2a of the disk 2
Since it is attached to the machine to be braked by fixing it to the shaft S to be braked, there is a degree of freedom in attaching this device to the machine to be braked.Moreover, during braking, the disk 2 and the field core 5 are connected to each other. Bearing 12
Since the compression coil spring 9 is integrally connected through the A pressing force acts on the field core 5, and as a result, pressing forces in opposite directions as described above act on the bearing 12 interposed between the disk 2 and the field core 5, and these pressing forces are mutually generated. As a result, the thrust load applied to the braked shaft S is reduced.

[Effects of the Invention] As is clear from the above description, according to the present invention, the thrust load applied during braking to the bearing incorporated in the negative actuation type electromagnetic brake and the braked shaft of the braked machine is reduced. As a result, the service life of the braked machine to which this type of device is installed can be extended, and the electromagnetic brake is shipped as an integrated unit, allowing the user to attach it to the braked machine with a considerable degree of freedom. Therefore, excellent practical effects such as extremely easy installation can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view showing an embodiment of the negative operating type electromagnetic brake of the present invention, and FIG. 2 is a longitudinal sectional side view of the upper half of a conventional negative operating type electromagnetic brake. In the drawings, 1... bearing, 2... disk, 5... field core, 6... electromagnetic coil, 7... armature, 8... guide pin, 9... compression coil spring,
10... Lining, 12... Bearing, 13, 14
...Snat spring, 15... Rotation prevention member, 1
6... Headed pin, 17... Rotating plate, 18...
Set color, 19...Set scroll.

Claims (1)

[Claims] 1. A disk consisting of a boss part attached to a braked shaft protruding from the machine frame of a machine to be braked, and a flange part extending radially from this boss part; a field with a built-in electromagnetic coil that is supported via a bearing and is disposed between a machine frame of the machine to be braked and a flange part of the disk at a distance from the machine frame and the flange part; a core; an armature provided to be movable in the axial direction between the field core and the flange portion of the disk by means of a guide member fixed to the field core; the armature is pressed toward the flange portion of the disk; A negatively actuated electromagnetic brake comprising an elastic member, a rotation preventing member for keeping the field core immobile in a rotational direction, and a fixing member for fixing the boss portion of the disk to the braked shaft.