JPH0529552Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to a gap adjustment device for an electromagnetic brake that adjusts the gap between a rotary disk and a brake disk.

(Prior Art) An example of an electromagnetic brake used in a conventional motor with a brake is shown in FIG. In FIG. 5, a rotary disk 2 is fitted to the tip of the rotary shaft 1, and the rotary disk 2 is rotated integrally with the rotary shaft 1 by a key 3. As shown in FIG. This rotary disk 2 is pressed against a nut 7 screwed into a male threaded portion 6 at the tip of the rotary shaft 1 by a compression spring 5 provided between the inner race 4a of a ball bearing 4 that supports the rotary shaft 1. , which keeps it fixed in place. On the other hand, a yoke 9 having an electromagnetic coil 8 therein is fixed to a motor bracket 10 with bolts 11, and a brake disc 12 is disposed between the yoke 9 and the rotary disc 2. The brake disc 12 is supported so as to be non-rotatable and movable in the axial direction by fitting the small hole 12a into the head 11a of the bolt 11. and,
This brake disc 12 is biased so as to come into pressure contact with the rotary disc 2 by a compression spring 13 provided between it and the motor bracket 10. When the electromagnetic coil 8 is energized in accordance with the energization of the motor, the brake disc 12 is attracted to the yoke 9 against the spring force of the compression spring 13 and moves away from the rotary disc 2, and the rotary shaft 1 is released from the brake. Be made into a state and rotate. When the electromagnetic coil 8 is cut off in accordance with the motor cut-off, the brake disc 12 is moved to the rotary disc 2 by the biasing force of the compression spring 13.
The rotating shaft 1 is braked.

In such an electromagnetic brake, the gap adjustment between the rotary disk 2 and the brake disk 12 when the brake is released is performed by screwing the nut 7 forward and backward. That is, since the rotary disk 2 is fitted to the rotary shaft 1 so as to be movable in the axial direction, when the nut 7 is screwed back and forth, the rotary disk 2 is pushed by the nut 7 and moves in the direction of arrow A. Or compression spring 5
It moves in the direction opposite to arrow A due to the urging force of .
By such axial movement of the rotary disk 2, the gap between the rotary disk 2 and the brake disk 12 is adjusted. After adjusting the appropriate gap, use the chrysanthemum washer 1.
4 by bending the protruding piece 14a on the outer periphery of the nut 7.
a. As shown in FIGS. 6 and 7, the chrysanthemum washer 14 is prevented from rotating by inserting a tongue piece 14b protruding from the inner circumference into the keyway 1a of the rotating shaft 1. 14 protrusions 14a
By engaging the nut 7 with the groove 7a of the nut 7, the nut 7 is prevented from rotating, thereby holding the rotary disk 2 at a set position.

(Problem to be solved by the invention) However, with the above gap adjustment configuration,
Since two members, the nut 7 and the washer 14, are essential, this is disadvantageous in terms of the number of parts. Also,
When inserting the chrysanthemum washer 14 into the rotating shaft 1, insert the tongue piece 1
4b must be aligned with the keyway 1a, which is troublesome and is particularly disadvantageous when automatic assembly is intended.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an electromagnetic brake gap adjustment device that can reduce the number of parts and can easily handle automated assembly.

[Structure of the invention] (Means for solving the problem) The electromagnetic brake gap adjustment device of the invention has the following features:
A male threaded portion is formed on the rotating shaft, an engaged portion is formed on the rotating disk, and the rotating disk is moved in the axial direction of the rotating shaft by being screwed into the male threaded portion and screwed back and forth, thereby causing rotation when the brake is released. A position having a nut part for adjusting the gap between the disc and the brake disc, and a projecting piece provided protruding from the nut part and bent to engage the engaged part and prevent the nut part from rotating. It is equipped with an adjustment tool.

(Function) The nut portion of the position adjuster is screwed into the male threaded portion of the rotating shaft and screwed forward and backward. Then, the rotary disk is moved in the axial direction by the axial movement of the position adjustment tool, and the gap between the rotary disk and the brake disk is adjusted. After this adjustment, the projecting piece of the position adjuster is bent and engaged with the engaged portion of the rotary disk. Since the rotary disk does not rotate with respect to the rotating shaft, the position adjustment tool is prevented from rotating by engaging the protrusion with the engaged portion.

(Embodiment) An embodiment in which the present invention is applied to an electromagnetic brake of a motor with a brake will be described below with reference to FIGS. 1 to 4.

The overall structure of the electromagnetic brake is as shown in FIG. 1, with a rotating shaft 21 supported by a bracket 24 of a motor frame 23 via a ball bearing 22. A yoke 26 of an electromagnet 25 is fixed to this bracket 24 with bolts 27.
An electromagnetic coil 29 embedded in resin 28 is disposed within an annular recess 26 a formed in yoke 26 . The head 27a of the bolt 27 protrudes from the end surface of the yoke 26, and the small hole 31 of the brake disc 30 is fitted into the head 27a, so that the brake disc 30 is attached to the bracket 24 in a non-rotatable manner and in the axial direction. It is supported in a movable manner.
A compression spring 31 is provided between the bracket 24 and the brake disc 30.
1, the brake disc 30 is separated from the yoke 26 and brought into pressure contact with the rotary disc 32. This rotary disk 32 is fitted to the distal end side of the rotary shaft 21 so as to be movable in the axial direction, and is adapted to rotate integrally with the rotary shaft 21. To this end, as shown in FIG. 2, the key 35 is arranged so as to straddle the key groove 33 formed in the inner circumferential surface of the hollow boss portion 32a of the rotating disk 32 and the key groove 34 formed in the rotating shaft 21.
is embedded. A cooling air generating blade 36 is provided radially projecting from one end surface of the rotary disk 32, and an annular shoe 37 is attached to the other end surface. Further, as shown in FIG. 2, a notch groove 3 as an engaged portion is provided on the outer peripheral side of the tip of the hollow boss portion 32a.
A plurality of 8 are formed at different angular intervals. A compression spring 39 inserted into the rotating shaft 21 is disposed between the rotating disk 32 and the inner race 22a of the ball bearing 22, and the rotating disk 32 is rotated toward the distal end of the rotating shaft 21 by this compression spring 39. energized. In order to stop the rotary disk 32 biased by this compression spring 39 in a fixed position, the rotary shaft 2
A position adjustment tool 40 is attached to 1.

That is, the position adjustment tool 40 is made of a metal plate material, and as shown in FIGS. 3 and 4, it has a central nut portion formed by forming a female thread on the inner periphery of a burred cylindrical portion. 41, and a plurality of protrusions 42 formed by punching with a press so as to protrude radially from the nut portion 41. Such a position adjustment tool 40 is a nut part 4.
1 is attached to the rotating shaft 21 by screwing it into a male threaded portion 43 formed at the small diameter portion at the tip of the rotating shaft 21. The rotary disk 32 is pressed against the position adjuster 40 by the spring force of the compression spring 39, and is fixed at a fixed position on the rotary shaft 21. Then, an appropriate protrusion 42 is bent and fitted into an appropriate notch 38 of the rotary disk 32, thereby preventing the nut portion 41 from rotating and preventing the rotation disk 32 from shifting.

Therefore, when the electromagnetic coil 29 is energized in accordance with the energization of the stator coil (not shown) of the motor,
The brake disc 30 is attracted to the yoke 26 and the rotary disc 32
away from show 37. As a result, the turntable 3
2, and in turn, the rotary shaft 21 is brought into a brake-released state, and the rotary shaft 21 rotates. Then, when the electromagnetic coil 29 is cut off in accordance with the stator coil cutoff,
The brake disc 30 is separated from the yoke 26 by the spring force of the compression spring 39 and is pressed against the shoe 37 of the rotary disc 32, thereby bringing the rotary disc 32 and the rotary shaft 21 into a braking state, so that the rotary shaft 21 is forcibly moved. will be stopped.

Now, in the above-mentioned configuration, a procedure for adjusting the gap between the brake disk 30 and the shoe 37 of the rotating disk 32 when the brake is released, i.e., when the brake disk 30 is attracted to the yoke 26, will be described.
This is the same as the gap between the brake disk 30 and the yoke 26 when the brake disk 30 is in pressure contact with the yoke 26, so in this embodiment, the case where the gap between the brake disk 30 and the yoke 26 is adjusted will be described.
6 is fixed to the bracket 24, the brake disk 30 is supported by the head 27a of the bolt 27, the rotating disk 32 is fitted onto the rotating shaft 21, and then the nut portion 41 of the position adjuster 40 is screwed into the male thread portion 43 of the rotating shaft 21.
When the nut portion 41 is screwed forward, the position adjuster 40 moves the rotating disk 32, which is in pressure contact with the brake disk 30, toward the yoke 26 against the spring forces of the compression springs 31 and 39, thereby reducing the gap between the brake disk 30 and the yoke 26. Conversely, when the nut portion 41 is screwed back, the position adjuster 40 moves in a direction away from the yoke 26, and the brake disk 30 and the rotating disk 32 move in accordance with the movement of the position adjuster 40.
While in a pressed state, the brake disk 30 is moved in a direction away from the yoke 26 by the spring forces of the compression springs 31, 39, so that the gap between the brake disk 30 and the yoke 26 becomes larger. In this manner, by screwing the nut portion 41 of the position adjustment tool 40 back and forth, the brake disk 30 moves in a direction toward or away from the yoke 26, so that the gap between the brake disk 30 and the yoke 26 can be adjusted. After the gap adjustment,
The protruding pieces 42 are bent to fit into the notched grooves 3 of the rotating disk 32.
8. As a result, the position adjustment tool 40 is connected to the rotating disk 32 which does not rotate relative to the rotating shaft 21. Therefore, the position adjustment tool 40 is prevented from rotating with respect to the rotating shaft 21.
There is no risk of the rotary disk 32 becoming misaligned due to the rotary disk 32 accidentally rotating.

As described above, according to this embodiment, the position of the rotary disk 32 can be adjusted and the rotation of the position adjuster 40 itself can be performed using one position adjusting tool 40, so that the position of the rotary disk can be adjusted using the conventional nut 7. Unlike the configuration in which the nut 7 is adjusted and prevented from rotating by the chrysanthemum washer 14, the number of parts is reduced and costs can be reduced. In addition, in the conventional chrysanthemum washer 14, when inserting it into the rotating shaft 1, the tongue piece 14
b had to match the keyway 1a,
The position adjuster 40 of this embodiment does not require such a configuration, and simply needs to be screwed into the male threaded portion 43 of the rotary shaft 21, so that assembly can be easily automated.

In the above embodiment, the brake disk 30 is moved by turning on and off the electromagnet 25, but the rotary disk 3
2 may be moved by an electromagnet 25.

[Effects of the invention] As explained above, according to the electromagnetic brake gap adjustment device of the invention, the nut portion screwed into the male threaded portion of the rotating shaft is bent and engaged with the engaged portion of the rotating disk. One position adjuster with a protrusion can adjust the position of the rotary disk and stop the position adjuster itself from rotating, reducing the number of parts and reducing costs. In addition, since the position regulating member only needs to be simply screwed onto the male threaded portion of the rotary shaft, an excellent effect is achieved in that automatic assembly can be easily handled.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the present invention, in which FIG. 1 is a longitudinal cross-sectional side view of the main parts, FIG. 2 is a partially enlarged front view of the rotary disk with the position adjuster removed, and FIG. 4 and 4 are an enlarged front view and an enlarged longitudinal sectional side view of the position adjustment tool, and FIG. 5 is a first one showing a conventional example.
6 and 7 are an enlarged longitudinal sectional front view and an enlarged longitudinal sectional side view showing the locking structure of the chrysanthemum washer and nut. In the figure, 21 is a rotating shaft, 23 is a motor frame, 25 is an electromagnet, 30 is a brake plate, 32
37 is a rotary disk, 37 is a brake shoe, 38 is a notch groove (engaged portion), 40 is a position adjuster, 41 is a nut portion, 42 is a projecting piece, and 43 is a male screw portion.

Claims (1)

[Scope of utility model registration request] A rotating disk fitted to the rotating shaft so as to rotate integrally with the rotating shaft and a brake disk provided on the frame side are brought into contact and separated by energization and disconnection of an electromagnet, thereby braking and releasing the braking of the rotating shaft. A male screw portion formed on the rotary shaft, an engaged portion formed on the rotary disk, and the male screw portion are screwed together and are screwed back and forth, thereby causing the rotary disk to be connected to the rotary shaft. A nut portion that is moved in the axial direction to adjust the gap between the rotary disk and the brake disk when the brake is released; and a nut portion that is provided protrudingly from the nut portion and is bent to engage the engaged portion and lock the nut. A gap adjustment device for an electromagnetic brake, comprising a position adjustment tool having a protrusion that prevents rotation of the part.