JPS6220921A - Negative operating type solenoid brake - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] [In the present invention, the state in which the armature is magnetically attracted by the electromagnetic coil of the field core is the brake release side, and the state in which the electromagnetic coil is demagnetized and the spring member This relates to a negative actuation type electromagnetic brake in which the activated state is on the braking side.

[Prior Art] ゛A negative actuation type electromagnetic brake, which is known as a type of electromagnetic brake, is a type of electromagnetic brake that operates between an armature, which is released from the attraction of an electromagnetic coil and is elasticized by a compression coil spring, and a fixed pressure receiving plate. Braking force is obtained by squeezing a disk, and because strong braking force can be obtained by spring pressure, it has been installed as a safety brake in general-purpose motors and machine tools, and in recent years, it has also been used in industrial robots. The demand for it is increasing as it is used as a holding brake.

FIG. 2 is a vertical cross-sectional view of this type of conventional electromagnetic brake of negative operation type, and it will be explained based on this figure. It is equipped with an annular pressure-receiving plate 4 fixed with a plurality of bolts 3, and a headless adjustment screw 5 screwed into a screw hole at a place dividing the outer periphery into a plurality of equal parts in the circumferential direction. A cylindrical collar 6 is fitted and fixed with a nut 7.

Reference numeral 8 denotes a field core formed into a cylindrical shape and having seven flange 8a at the center in the axial direction, which is fixed with a nut 9.10 by fitting the adjustment screw 5 into the hole provided in the seven flange 8a. (shi, oak) 9. By relaxing 10 and moving forward and backward, υ
, so that the distance between the field core 8 and the pressure receiving plate 4 can be adjusted. Inside the annular hole 8b provided in the field core 8, there is an electromagnetic coil 1 connected to a power source (not shown).
1 is attached, and the collar 6 is formed into a disk shape.
An armature 12 supported so as to be movable in the axial direction,
It is configured to be magnetically attracted to the field core 8 by magnetic flux 13 generated by applying voltage to the electromagnetic coil 11 . On the other hand, the motor shaft 14 of the motor 2, which is the shaft to be braked, has
A flanged cylindrical hub 15 is fitted with rotation restricted by a key 16, and is fixed with a backing plate 17 and a bolt 18 screwed into a screw hole of the motor shaft 14.

Reference numeral 19 denotes a disk consisting of a resilient annular plate 19a riveted to the flange of the hub 15, and a lining 19b adhered to both surfaces of the outer circumference of the annular plate 19a.
9b faces between the pressure receiving plate 3 and the armature 12, and is configured to rotate together with the motor shaft 14. Furthermore, a compression coil spring 20 is loaded into a spring hole 8c provided at a plurality of equal parts dividing the inner circumferential portion of the field core 8 in the circumferential direction. There is.

Due to this configuration, when the motor shaft 14 rotates, the electromagnetic coil 11 of the negative actuation type electromagnetic brake 1
is energized and the armature 12 is compressed by the coil spring 2
Since the lining 19b of the disk 19 is slightly separated from the pressure receiving plate 4 and the armature 12, the motor shaft 14 is released from braking and the disk is magnetically attracted to the field core 8 against the elastic force of 0. It rotates with 19.

At the same time as the motor 14 is turned off, the electromagnetic coil 11 is demagnetized, and the armature 12 moves away from the field core 8 due to the elastic force of the compression coil spring 20 and pushes the lining 19b of the disk 19 with the elastic force, so that the annular plate 19
& is elastically deformed, the lining 19b is strongly pressed between the pressure receiving plate 4 and the armature 12, and the motor shaft 14 integrated with the disc 19 is braked.

In the conventional negative actuating electromagnetic brake that operates in this way, when the electromagnetic brake 1 is attached to a braked device such as a general-purpose motor 2, the adjustment screw 5 installed in the pressure receiving plate 4 is used.
Fit the collar 6 to the holder and secure it with the pad 7. Then, the armature 12 was fitted and supported by the collar 6 while interposing the disk 19 integrated with the hub 15 between it and the pressure receiving plate 4, and the electromagnetic coil 11 and the compression coil spring 20 were installed in advance. The electromagnetic brake 1 is completed by fitting the field core 8 to the adjustment screw 5 and fixing it with the armature 9.10 while holding P]G for a predetermined period with a gauge or the like between the field core 8 and the armature 12. 15 to the motor shaft 14 and tighten the bolt 3.18, the electromagnetic brake 1 is installed.

[Problem that the invention seeks to solve]

However, in the conventional negative actuation type electromagnetic brake configured in this way, in order to obtain a predetermined distance between the lining 19b of the disk 19, the pressure receiving plate 4, and the armature 12 when the electromagnetic brake 1 is released, For example, by changing the thickness of the flange 15a of the hub 15, or by changing the thickness of the flange 15a of the hub 15,
It is necessary to make a design change corresponding to the dimensions of the equipment to be braked, such as the general-purpose motor 2, by interposing a 7mm or the like between the stepped portion 14a and the flange 15m of the electromagnetic brake 1.
If there is no design change on the side, step 2 on the braked equipment side
There was a problem in that it was necessary to change the design of the parts such as m, 14a, etc., and the degree of freedom in design could not be obtained.

[Means for solving problems]

In order to solve such problems, in the present invention, the hub part of the disc with the lining part interposed between the pressure receiving plate and the armature is fixed to the shaft to be braked in the rotational direction and supported slidably. This hub part and a field core containing a built-in electromagnetic coil are fitted to each other so as to be rotatable via a bearing while restricting movement in the axial direction.

[For production]

With this configuration, the armature and the disk are interposed between the pressure receiving plate and the field core to adjust the gap between the armature and the field core, and then the hub part of the disk and the braked shaft are connected. If the pressure plate or field core is fixed to the braked device without mating, the electromagnetic brake will be attached to the braked device with the gap between the disc lining, pressure plate, and armature adjusted. .

〔Example〕

FIG. 1 is a longitudinal sectional view showing an embodiment of a negative actuation type electromagnetic brake according to the present invention. Items with the same reference numerals as those in FIG. 2 have the same configuration, so detailed explanation thereof will be omitted. , this will be briefly explained in the following explanation. An armature 12 is supported by a plurality of adjusting screws 5 protruding from a pressure receiving plate 4 that is fitted and fixed to a stepped portion 2a of a general-purpose motor 2 via a collar 6 that is fixed with a nut 7, and is also adjustable. screw 5
A field core 8 equipped with an electromagnetic coil 11 and a compression coil spring 20 is supported so as to be movable and adjustable in the axial direction, and is then fixed with a bolt 9.10.

The annular plate 1Sa of the disk 19, which has an annular lining 19b interposed between the pressure receiving plate 4 and the armature 12, has a hub 2 formed in a stepped shape with a large diameter portion 21m and a small diameter portion 21b.
The hub 21 is riveted to the flange 21c of the hub 9, and is slidably fitted onto a stepless motor shaft 22 as a shaft to be braked, and fixed in the rotational direction by a key 16. has been done. A pair of ball bearings 23 as bearings have inner rings fitted into the small diameter portion 21b of the knob 21, and outer rings of the ball bearings 23 are fitted into the large diameter portion of the inner hole of the field core 8. ing. The ball bearing 23 is then attached to the hub 21 by a snap ring 24.25.
Movement in the axial direction is restricted with respect to the field core 8 and the field core 8. That is, the hub 21 and the field core 8 are integral with each other in the axial direction and are formed so as to be rotatable with respect to each other.

With this configuration, the motor shaft 220
During rotation, the electromagnetic coil 11 is energized and the armature 12 is magnetically attracted to the field core 8 against the elastic force of the compression coil spring 20, and the lining 19b of the disk 19 is connected to the pressure receiving plate 4 and the armature 12. As the motor shaft 22 is released from the brake and rotates with the disk 19, the motor shaft 22 is released from the brake.

At the same time as the motor shaft 22 is turned OFF-g, the electromagnetic coil 11
is demagnetized, and the armature 12 moves away from the field core 8 due to the elastic force of the compression coil spring 20 and pushes the lining 19b of the disk 19 with the elastic force, so that the annular plate 1
9& is elastically deformed, the lining 19b is strongly pressed between the pressure receiving plate 4 and the armature 12, and the motor shaft 22 integrated with the disc 19 is braked.

When the electromagnetic brake 1 is attached to the general-purpose motor 2, the collar 6 is fitted into the adjustment screw 5 installed in the pressure receiving plate 4, and fixed with a nut 7. Then, the armature 12 is fitted and supported by the collar 6 while interposing a disk 19 integrated with the hub 21 in advance between the armature 12 and the pressure receiving plate 4. Next, the field core 8 to which the electromagnetic coil 11 and the compression coil spring 20 are attached in advance is fitted into the adjustment screw 5,
While maintaining a predetermined gap G between the armature 12 and the armature 12 using a gauge or the like, fix the armature 12 with an arrow 9.10.

After this, the electromagnetic coil 1 is completed by inserting the ball bearing 23 between the hub 21 and the field core 8 and fixing it with the snap rings 24 and 25. The electromagnetic brake 1 is mounted on the general-purpose motor 2 by fitting onto the shaft 22 and fixing the pressure receiving plate 4 to the end face of the general-purpose motor 2 with bolts 3.

In this embodiment, the key 16 and a long keyway are used as means for slidably and rotatably supporting the knob 2 with respect to the motor shaft 22, but spline fitting may also be used. Although the present embodiment shows an example in which the disk 19 is riveted to the hub 21, the disk 19 and the hub 21 may be fitted with a spline. In this case, it is not necessary to impart spring properties to the supporting member of the disk 19, which is the annular plate 19m having spring properties in this embodiment. Further, in this embodiment, an example is shown in which the assembled electromagnetic brake 1 is fixed to the brake target equipment side by the pressure receiving plate 4, but the filled core 8 side may be fixed.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, in a negative actuating electromagnetic brake, a hub portion of a disk with a lining portion interposed between a pressure receiving plate and an armature is attached to a braked shaft in the rotational direction. In addition, this hub part and the field core with a built-in electromagnetic coil are fixed to the field core so as to be freely slidable, and the movement of this hub part and the field core with a built-in electromagnetic coil is restricted in the axial direction, and the pressure plate and the field core are fitted together rotatably through a bearing. After adjusting the gap between the armature and the field core by inserting an armature and a disk between the core, fit the hub part of the disk and the shaft to be braked, and then place the pressure plate or field core on the side of the device to be braked. If it is fixed in place, the gap between the disc lining and the pressure receiving plate and armature will be adjusted and it will be installed on the equipment to be braked by the electromagnetic brake.
It is easier to attach the electromagnetic brake to the braked equipment, improving work efficiency, and there is no need to change the design of the disc or the braked shaft even if the dimensions of the braked equipment change, increasing the degree of freedom in design. improves.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of a negative operation type electromagnetic brake according to the present invention, and FIG. 2 is a longitudinal sectional view of a conventional negative operation type electromagnetic brake. 1... Negative action electromagnetic brake, 2... General purpose motor, 4... Pressure receiving plate, 5... Adjustment screw, 8...
・Field core, 11... Electromagnetic coil, 12...
... Armature, 16 ... Key, 19 ... Disc, 19 & ... Annular plate, 19b ... Lining, 21 ... Hub, 22 ... Motor shaft, 23
...Ball bearing, 24.25...Snap ring. Hook applicant: Ogura Clutch Co., Ltd. Agent: Masaki Yamakawa (12 e-gis) Figure 1

Claims (1)

[Claims] The armature is supported movably in the axial direction of the braked equipment by a plurality of adjustment screws protruding from the outer circumferential side of the pressure receiving plate, and an electromagnetic coil that magnetically attracts this armature by excitation is built in, and the braked equipment is controlled by the adjustment screws. A cylindrical field core is fixedly supported so as to be movable in the axial direction of the device, and a hub portion is fixed to a braked shaft that engages and protrudes into the inner hole of the armature and field core, and the pressure receiving plate.
In a negative actuation type electromagnetic brake comprising a disc with a lining part interposed between the armatures and a spring member that biases the armature toward the disc, the hub part of the disc is fixed to the braked shaft in the rotational direction. The negative actuation type electromagnetic brake is characterized in that the hub part and the field core are rotatably fitted together via a bearing while restricting movement in the axial direction. .