JPS6220923A - Negative operating type solenoid brake - Google Patents

Abstract

PURPOSE:To make the setting of a brake disc to a braked apparatus ever so easy, by supporting a hub part of the disc on a braked shaft free of slide motion without rotation, while fitting the hub part and a field core with each other free of rotation in a way of regulating their axial movements, and dividing the disc into the hub part and a support member of a frictional engaging member via an elastic body. CONSTITUTION:A motor shaft 36 is subjected to a whirl-stop by means of a key 16, and a support plate 34 is positioned to a hub part 33 regulating an axial movement to a field core 8 via a ball bearing 37, via an elastic body 40 with a nut 43. And, in order to interpose lining 19b between a pressure receiving plate 4 and an armature, a disc 19 is attached to the support plate 34 with a rivet. Here, positional relations among the lining 19b, the armature 12 and the pressure receiving plate 4 are adjusted with the nut 43, and locked with a bolt 44. Accordingly, as for its setting, it will merely be enough that the field core 8 is locked to a motor 2 with a bolt 32, thus the setting is easy, and besides, the degree of freedom in a design is securable and, what is more, gap adjustment after installation is performable.

Description

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

[Conventional technology]

A negative-actuation type electromagnetic brake, known as a type of electromagnetic brake, pinches a disc between an armature that is released from the attraction of an electromagnetic coil and springs up with a compression coil spring, and a fixed pressure receiving plate. Because of the strong braking force produced by spring pressure, it has been installed as a safety brake on general-purpose motors and machine tools9, and in recent years has been used as a holding brake for industrial robots. The demand for these products is increasing.

FIG. 5 is a vertical cross-sectional view of this type of conventional negative-actuation electromagnetic brake, and this will be explained based on the figure.
An annular pressure receiving plate 4 fixed to the end face of the plate with a plurality of bolts 3
A cylindrical collar 6 is fitted into a headless adjustment screw 5 screwed into a screw hole at a location dividing the outer periphery into a plurality of equal parts in the circumferential direction, and fixed with a nand 7. It's visible.

Reference numeral 8 denotes a field core formed in a cylindrical shape and having a flange 8a at the center in the axial direction, and is fixed with a Nand 9 and 10 by fitting a hole provided in the flange 8a into an adjusting screw 5. The space between the field core 8 and the pressure receiving plate 4 can be adjusted by loosening the handles 9 and 10 and moving them back and forth. 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 to the collar 6, and the collar 6 is formed into a disk shape.
An armature 12 supported movably 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
7 A cylindrical hub 15 with a flange is fitted into the hub 15 so that its rotation is 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 an annular plate 19& having spring properties riveted to the flange portion of the hub 15, and a lining 19b attached to both surfaces of the outer periphery.
9b faces between the pressure receiving plate 4 and the armature 12, and is configured to rotate together with the motor shaft 14. In addition, a compression coil spring 20 is loaded in a spring hole 8C provided at a location dividing the inner peripheral portion of the field core 8 into a plurality of equal parts in the circumferential direction. has been done.

With this configuration 1, when the motor shaft 14 rotates, the electromagnetic coil /I/
11 is energized, 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 slightly separated from the pressure receiving plate 4 and the armature 12. As a result, the motor shaft 14 is released from braking and rotates together with the disk.

At the same time as the motor 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 19m 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 collar 6 is fitted to the adjustment screw 5 installed in the pressure receiving plate 4. , fix with Nando 7. After the armature 12 is 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, the electromagnetic coil 11 and the compression coil spring 20 are attached in advance. Fit the adjusted field core 8 to the adjustment screw 5 and set it between it and the armature 12 for a predetermined distance 1! using a gauge or the like. The electromagnetic brake 1 is completed by holding the IG and fixing it with Nand 9°10, so the hub 15
The electromagnetic brake 1 is installed by fitting it with the motor shaft 14 and tightening the bolt 3.18.

Furthermore, FIG. 6 is a longitudinal cross-sectional view of a conventional negative actuation type electromagnetic brake having a configuration different from that shown in FIG. For example, the field core 8 is fixed to the end face of the general-purpose motor 2, and the disk 19 is connected to the key 21. Natsu 22
and 23 are fixed to the tip of the motor shaft 14, for example. An armature 12 interposed between the field core 8 and the disk 19 is guided by a guide pin 24 on the field core 8 side, and is biased toward the disk 19 side by a compression coil spring 20. The roughly annular lining 25 is connected to the disc 19 or the armature 1
It is fixed at 2.

Due to this structure, it operates in the same way as the one shown in FIG. In addition, when attaching the electromagnetic brake 1 to the general-purpose motor 2, after fixing the field core 8 to the motor 2 with bolts etc. screwed in from the motor 2 side, the armature 12 and the disc) 9 are connected to the motor shaft 1.
4, the key 21 and the nut 22. Fix with bolt 23. The gap G between the field core 8 and the armature 12 is adjusted by the screwing degree of the nut 22.

[Problem that the invention seeks to solve]

However, in the conventional negative actuating electromagnetic brake configured as described above, firstly, in the one shown in FIG.
b and pressure receiving plate 4. Even if the gap between the armate air 12 and the electromagnetic brake 1 is adjusted at the time of shipment, the step 2a+
Since this gap is regulated by the stepped portion 14m of the Tanabata shaft 14, it is necessary to readjust the gap by inserting shims into the stepped portions 2a and 14m, and readjust the gap G accordingly. This poses a problem in that it is troublesome and time consuming to install, and flexibility in design cannot be achieved. Moreover, what is shown in FIG. 4 includes a field core 8, an armature 12. Because the disk 19 etc. are separate parts at the time of shipment, the gap G cannot be adjusted at the time of shipment.
Since all the components have to be adjusted after being attached to the motor 2, the attachment is troublesome and takes a long time, and there is a problem in that a degree of freedom in design cannot be obtained.

[Means for solving problems]

In order to solve these problems, in the present invention, the hub portion of the disk that is adjacent to the armature and frictionally engages with the armature is fixed to the shaft to be braked in the rotational direction and is slidably supported. The I-shaped part and the field core are fitted together rotatably via a bearing while restricting their movement in the axial direction, and this disk is fitted into the I-shaped part and its small diameter part to connect it to the armature. The frictional engagement member is divided into a support member that supports the friction engagement member, and the hub portion and the support member are fitted with each other so as to be movable and adjustable in the axial direction with an elastic body interposed between them.

[Effect]

With this configuration, before shipping, etc., the field core and the hub part of the disk are rotatably but non-slidably fitted via the bearing, the armature is fitted to the hub part, and the armature is fitted to the small diameter part of the hub part. By adjusting the movement of the support member for the wear engagement member of the disc fitted through an elastic body, an electromagnetic brake is completed in which the gap between the field core, armature, and disc is adjusted. If the gap is attached to the gap, the gap will not change and will be maintained as it is, and if the gap needs to be adjusted after being attached, it will be adjusted by operating the movement adjusting member.

〔Example〕

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of the negative operation type electromagnetic brake according to the present invention. Items with the same reference numerals as those in FIG. This will be briefly explained in the explanation. The electromagnetic brake 31 includes a pressure receiving plate 4 formed in an annular shape, and a field core 8 whose flange 8a is movably supported by a bolt 5 protruding from its outer periphery and fixed with a nut 9° 10. The field core 8 includes an electromagnetic coil 11 and a compression coil spring 20 built therein. Between the pressure receiving plate 4 and the field core 8, an armature 12 that is magnetically attracted by an electromagnetic coil 11 is slidably supported by a collar 6 on the bolt 5. A disk 19 consisting of an annular plate 19m and linings 19b adhered to both sides of the annular plate 19m is interposed between them. Up to this point, the configuration is the same as that shown in FIG. Tasoshi, 5th
The electromagnetic brake 1 shown in the figure is attached to the motor 2 by fixing the pressure plate 4 to the motor 2 with bolts 3, but the electromagnetic brake 31 shown in FIG. 32 is attached to the motor 2 by screwing it into the screw hole of the field core 8.

The hub portion 33 that supports the disk 19 includes a disk-shaped support plate 34 as a support member and a bottomed cylindrical hub 35.
A disk 19 serving as a friction retaining member is riveted to the outer peripheral portion of the support plate 34. Further, the hub 35 is formed into a stepped shape with a small diameter part 35a into which the support plate 34 is fitted, and a large diameter part 35b following this, and the large diameter part 35b is fixed in the direction of rotation by a key 16. and is slidably fitted onto the motor shaft 36. And hub 350
A pair of ball bearings 37 as bearings are interposed between the large diameter portion 35b and the inner hole of the field core 8, and these ball bearings 37 are connected to snap rings 38, 39 and the large diameter portion. 35b.

Movement in the axial direction is restricted by the stepped portion of the field core 8. That is, the field core 8 and the hub 35 are integrated in the axial direction. Moreover, between the support plate 34 and the step end face of the hub 35, there is an elastic plate 40 as an annular elastic body formed of an elastic material such as rubber, and an annular metal plate 41, 42. Both sides are sandwiched and inserted, and a nand 43 is screwed into a threaded portion provided in the small diameter portion 35a of the knob 35. By rotating the nut 43 back and forth, the elastic plate 40 expands and contracts, and the lining 19b and the pressure receiving plate 4. The gap between the armature 12 and the armature 12 is adjusted. 44 is a bolt for fixing the nand 43 to the hub 35 after adjusting its rotation;
Further, 45 is a knock pin that integrates the support plate 34, the elastic plate 40, and the hub 35 in the circumferential direction.

With this configuration, when the motor shaft 36 rotates, the electromagnetic coil 11 is excited and the armadure 1
2 is magnetically attracted to the field core 8 against the elastic force of the compression coil spring 20, and the lining 1 of the disk 19
Since the motor shaft 9b is slightly separated from the pressure receiving plate 4 and the armature 12, the motor shaft 36 is released from braking and rotates together with the disk 19.

At the same time as the motor 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 integrated motor shaft 36 is braked via the disk 19 and the hub portion 33.

When assembling the electromagnetic brake 31 before shipping, a ball bearing 37 is interposed between the field core 8 equipped with the electromagnetic coil 11 and the compression coil spring 20, and the hub 35, and the snap ring 38. After fixing the bolts 5 to the pressure receiving plate 4, install the disk 19, armature 12, etc. from the pressure receiving plate 4 side. The field cores 8 are stacked one on top of the other in this order, and the flanges 8a of the field cores 8 are temporarily fixed with a Nand 9.10. At this time, an elastic plate 40 and metal plates 41 and 42 are inserted between the support plate 34 and the hub 35, and a knock pin 45 is inserted therein.

After screwing the nut 43 onto the threaded part and temporarily tightening the bolt 44, loosen the Nand 9.10 and field core 8.
The gap G between the armature 12 and the armature 12 is adjusted to a predetermined size. Next, when the electromagnetic filter 11 is excited and the armature 12 is magnetically attracted to the field core 8, the gap between the armature 12 and the pressure receiving plate 4 is expanded, so that
Adjustment of the electromagnetic brake 31 before shipping is completed by first rotating the NAND 43 back and forth, adjusting the lining 19b so that it does not come into contact with either the armature 12 or the pressure receiving plate 4, and fixing it with the bolt 44. .

The electromagnetic brake 31 shipped in this way has the key 1
Fit the hub 35 to the motor shaft 36 while inserting the
Attachment is completed by fixing the field core 8 and motor 2 with bolts 32, and there is no need to adjust the gap G. Further, when the brake is released, the lining 19b does not come into contact with the pressure receiving plate 4 and the armature 12, so heat generation during idle rotation and wear of the lining 19b are prevented.

Furthermore, after a certain period of use, the gap G between the armature 12 and the field core 8 due to wear of the lining 19b, etc.
When the gap G increases, the gap G can be adjusted to a predetermined value by loosening the NANDs 9 and 10 and making the pressure receiving plate movable. In this case, the NANDs 43 can be rotated forward and backward by loosening the bolts 44. Accordingly, the position of the disc 1g when the brake is released can be adjusted.

FIG. 2 is a longitudinal cross-sectional view showing another embodiment of the present invention corresponding to FIG. 1, and the same reference numerals as those shown in FIG. However, only the different parts will be explained. In this embodiment, a hub 3 is used instead of the elastic plate 40 of the previous embodiment as an elastic body inserted between the support plate 34A to which the disk 19 is riveted and the hub 35.
Compression coil spring 4 partially loaded into spring hole 35d of 5
5 was set. Further, the knock pin 45 of the above embodiment is not required because the concave portion 35c provided in the hub 35 and the convex portion 34m of the support plate 34A mesh and engage with each other with a gap of 1 h between them. By doing so, when the NAND 43 is rotated forward and backward, the disk 19 moves while expanding and contracting the compression coil spring 45, and the gaps between the lining 19b, the pressure receiving plate 4', and the armature 12 are adjusted. The overall operation of the electromagnetic brake 31A and the operation of attaching it to the motor 2 are the same as those shown in FIG.

Furthermore, FIGS. 3 and 4 are longitudinal sectional views showing other embodiments of the present invention, in which FIG. 3 uses an elastic plate 40 as the elastic body as in FIG. 1, and FIG. As in FIG. 2, a compression coil spring 45 was used as the elastic body. Therefore, to explain the differences between the embodiments shown in FIGS. 3 and 4 with respect to the embodiments shown in FIGS. 1 and 2, in these embodiments, the pressure receiving plate 4 of each of the above embodiments is In addition, the disk 19 and the support plate 34 are integrated to form a disk 46 made of general steel. Also,
The disc 46 has a lining 47 adhered to the stepped portion and is engaged with the armature 12. Note that the lining 47 may be attached to the disk 46 side.

With this configuration, the electromagnetic brake 3
The overall operation of 1B and 31C is the same as that of the above embodiments, but in the case of these embodiments, the field core 8 and armature 1 are moved by rotating the NAND 43 back and forth.
2 is adjusted.

This adjustment is made before shipping, and when installed, key 1
6 and the bolts 32, and the lining 47 can be prevented from wearing out, as in the previous embodiments.

In each of the above embodiments, the elastic plate 4 made of rubber is used as the elastic body.
0 or the compression coil spring 45 is illustrated, but the elastic plate 40
A disc spring, a corrugated annular spring, or the like may be provided at the position where the spring is provided. Further, the hub 35 and the motor shaft 36 may be connected by spline fitting, for example, instead of the key 16. Roughly speaking, the fixing of the electromagnetic brakes 31.degree. 31A, 31B, and 31C to the equipment to be braked is not limited to the bolts 32, and it goes without saying that the seven fixing structures differ depending on the equipment to be braked.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, in a negative actuation type electromagnetic brake, the hub portion of the disk that is adjacent to the armature and engages in friction with the armature is fixed to the shaft to be braked in the rotational direction. The hub portion and the field core are slidably supported, and the hub portion and the field core are rotatably fitted together via a bearing while restricting axial movement, and the hub portion and the field core are rotatably fitted together.
It is divided into a support member that fits into the small diameter part and supports the frictional engagement member with the armature, and the knob part and the support member are adjusted to move in the axial direction by interposing an elastic body between them. By fitting freely, when attaching an electromagnetic brake to a device to be braked, it is extremely easy to install, as all that is required is to adjust it outside the machine before shipping or installing it, and then fix it with a key or bolt. Therefore, work efficiency is greatly improved compared to the conventional method, and a degree of freedom in design can be obtained. Also,
Since it is easy to adjust the gap between the field core and the disc, it is possible to easily deal with wear of the disc lining, etc., and by adjusting this gap appropriately, wear of the friction retaining part when the brake is released can be reduced. Heat generation can be reduced.

[Brief explanation of drawings]

1 to 4 show an embodiment of a negatively operated electromagnetic brake according to the present invention, FIG. 1 is a longitudinal sectional view thereof, and FIGS. 2 to 4 show other embodiments of the present invention, respectively. 5 and 6 are longitudinal sectional views of a conventional negative actuation type electromagnetic brake, respectively. 2...Motor, 8...Field core, 11...
... Electromagnetic coil, 12 ... Armature, 16.
...Key, 19...Disk, 19b, 47
... Lining, 20 ... Compression coil spring, 3
1, 31A, 31B, 31C...electromagnetic brake,
34...Support plate, 35...Hub, 36...
Motor L37...Ball bearing, 38.39.
...Snap ring, 40...Elastic plate, 43...
... Nut, 45... Compression coil spring. Patent applicant: Ogura Clutch Co., Ltd. Agent: Masaki Yamakawa (12 people) Figure 1 7 Figure 2 Figure 3

Claims (1)

[Claims] an armature, a field core containing an electromagnetic coil for magnetically attracting the armature, supporting the armature so as to be movable only in the axial direction via a supporting member, and disposed concentrically adjacent to the armature; a disk whose hub portion is supported by a braked shaft that is adjacent to the side opposite to the field core and frictionally engages with the armature and enters the inner hole of the armature and the field core; and a spring that urges the armature toward the disk. In the negative actuation type electromagnetic brake comprising a member, a hub portion of the disk is fixed to the braked shaft in the rotational direction and slidably supported, and the hub portion and the field core are moved in the axial direction. and the disc is divided into the hub portion and a support member that fits into the small diameter portion of the hub portion and supports a frictional engagement member with the armature; A negative actuation type electromagnetic brake characterized in that the hub portion and the support member are fitted together with an elastic body interposed therebetween so that they can be freely adjusted for movement in the axial direction.