JPH0660662B2 - Electromagnetic braking device - Google Patents

Abstract

PURPOSE:To reduce the time to manufacture a stator by separately forming the stator as a stator main body having a recessed part to install an exciting coil and an amrature support member provided with a plural number of arms in one body. CONSTITUTION:A stator 21 is constituted with a stator main body 22 and a fitting plate 23. The stator main body 22 is formed im an annular shape by processing a plate material with pressure. The fitting plate 23 is provided with a fixed part 23a to be fixed on the bottom part of the stator main body 22 and three armature support arms 23b set in one body on this fixed part 23. An a mature 24 is supported free o slide in the lengthy direction by the arm 23b. A b ake plate 25 is fixed on the arm 23b. Consequently, the time required to manufacture a statorcan be reduced and it is possible to keep the manufacturing cost low.

Description

The present invention relates to a non-excitation actuated electromagnetic braking device used in industrial machines, robots, and the like.

[Conventional technology]

A conventional electromagnetic braking device of this type is constructed as shown in FIGS.

FIG. 4 is a side sectional view showing a conventional electromagnetic braking device, FIG. 5 is a sectional view of the braking device portion, and FIG. 6 is a front view of a conventional stator. In these figures, 1 is a motor, 2
Is a rotating shaft of the motor 1, and a hub 4 for rotating the lining 3 together with the rotating shaft 2 is fixed to an end portion of the rotating shaft 2. The lining 3 is provided so as to be movable in the axial direction with respect to the hub 4. Reference numeral 5 denotes a stator of the electromagnetic braking device, which is made of low carbon steel and has a hollow portion 5a through which the rotary shaft 2 penetrates,
The coil 6 is formed in an annular shape having a recess 5b loaded through a resin 7, and is fixed to the motor 1 via a bolt 8 inserted into a mounting hole 5c. In addition, 5d is an outer pole of the stator 5, and 5e is an inner pole of the same.
In addition to the mounting hole 5c, a screw hole 5f into which a bolt for supporting an armature, which will be described later, is screwed, and a spring hole into which a spring, which will be described later, is inserted, are provided in the stator 5, as shown in FIG. 5g, a hole 5h through which a cover fixing bolt to be described later is inserted, and the like are provided in a state of being opened to the outer pole 5d. The holes 5c, 5f, 5g, 5h are provided at three locations along the circumferential direction of the stator 5 at predetermined intervals. Reference numeral 9 denotes an armature that is magnetically attracted to the stator 5. The armature 9 is opposed to the axial end of the stator 5 with a gap g, and a bush 11 fixed to the stator 5 with bolts 10. Through the stator 5
It is movably supported in the axial direction. The bolt 10 is screwed into the screw hole 5f of the stator 5. Reference numeral 12 is a braking plate for sandwiching the lining 3 together with the armature 9 for braking. The braking plate 12 is arranged on the side opposite to the motor with respect to the lining 3 and fixed to the stator 5 by the bolt 10. Has been done. 13 is a spacer for adjusting the size of the gap g, 14 is a spring for urging the armature 9 on the lining 3 side when there is no excitation, and this spring 14 is formed by a compression coil spring, and one end thereof is It is elastically mounted in each of the three spring holes 5g of the stator 5 in a state of being brought into contact with. Reference numeral 15 is a cover for covering the stator 5, the armature 9, the lining 3, the braking plate 12 and the like, and the cover 15 is fixed to the motor 1 via bolts 16 inserted into the holes 5h of the stator 5. In addition,
A broken line Φ in FIG. 4 indicates a magnetic path.

Next, the operation of the conventional electromagnetic braking device configured as described above will be described. First, when a voltage is applied to the coil 6 by a power source (not shown), a magnetic flux is generated along the magnetic path indicated by the broken line Φ in FIG. 4, and the attraction force causes the armature 9 to resist the spring force of the spring 14. It is magnetically attracted to the stator 5. That is, at this time, the braking force is released in the lining 3, and when a voltage is applied to the motor 1, the rotary shaft 2 is rotated together with the hub 4 and the lining 3. Also, the motor 1 and the coil 6
When the power supply to the armature 9 is stopped, the armature 9 is not magnetically attracted to the stator 5 and is pressed against the lining 3 by the elastic force of the spring 14. That is, the lining 3 is sandwiched between the armature 9 and the braking plate 12, whereby the braking force is applied to the rotary shaft 2 and the rotation of the rotary shaft 2 is stopped.

Generally, such an electromagnetic braking device is used as a safety brake because braking torque is generated by the elastic force of the spring 14 and the brake is automatically applied when a power failure occurs. Also, when this type of electromagnetic braking device is used as a brake motor such as a servo motor, when it is used for a robot or the like, the motor 1 and the braking device can be made smaller and lighter, and the outer diameter of the motor 1 can be reduced. And the outer diameter of the braking device were designed to have substantially the same dimensions.

[Problems to be Solved by the Invention]

However, in the conventional electromagnetic braking device configured as described above, the stator 5 must be provided with a large number of holes 5c, 5f, 5g, 5h, etc., and the area of the outer pole 5d through which the magnetic flux passes is It is necessary to design excluding the opening area of each hole.
Will be upsized. Moreover, when the stator 5 is manufactured, it takes a lot of time to open each hole, and it is also necessary to finish the burr formed on the opening edge of each hole. The manufacturing cost was high. To eliminate such problems, each bolt 8,10,16
The number of holes provided in the stator 5 may be reduced by arranging the same on the outer peripheral side of the stator 5, but in this case, the braking device itself becomes large. Further, particularly in a small electromagnetic braking device, the recess 5b into which the coil 6 is loaded is formed in the stator 5 by cutting, and the stator 5 is made of low carbon steel, which makes it difficult to process. , Recess 5b
It took a lot of processing time. Furthermore, when assembling, a spacer 13 must be inserted between the bush 11 and the braking plate 12 to adjust the size of the gap g so that the gap g between the armature 9 and the stator 5 is constant. As a result, the work becomes complicated and the assembly work takes a lot of time.

[Means for Solving the Problems]

In the electromagnetic braking device according to the present invention, the stator includes a stator body that is press-molded in an annular shape having a recess in which an exciting coil is mounted, and an arm that movably supports the armature with respect to the stator body. The arm is divided and formed by a plurality of armature support members integrally provided, and the arm is bent and formed on the outer peripheral side of the stator main body with its longitudinal direction parallel to the axial direction of the stator main body, and at the tip thereof. The braking plate is fixed.

[Work]

When manufacturing the stator, cutting work such as drilling is not required, so that the manufacturing work of the stator is simplified.

〔Example〕

An embodiment of the present invention will be described in detail below with reference to FIGS.

FIG. 1 is a side sectional view showing an electromagnetic braking device according to the present invention, FIG. 2 is a side view showing essential parts, and FIG. 3 is a front view showing the same. In these figures, the same or equivalent members as those described in FIGS. 4 to 6 are designated by the same reference numerals, and detailed description thereof will be omitted here. 1 to 3, reference numeral 21 denotes a stator used in the electromagnetic braking device of the present invention. The stator 21 includes a stator main body 22 and a mounting plate 23 fixed to the stator main body 22. It is configured and is fixed to the motor 1 by a mounting bolt 8. The stator body 22 is formed into an annular shape by pressing a plate material, and the annular portion is formed into a U-shaped cross section having a recess 22a into which the coil 6 is loaded via the resin 7. . The mounting plate 23 includes a fixing portion 23a fixed to the bottom portion of the stator body 22 by welding or the like, and three armature supporting arms 23b integrally provided on the fixing portion 23a. 23b is formed on the outer peripheral side of the stator body 22 by bending and forming its longitudinal direction parallel to the axial direction of the stator body 22. Reference numeral 24 is an armature, and a guide 24a into which the arm 23b is fitted is formed on the outer peripheral portion of the armature 24. The armature 24 is provided by inserting the arm 23b into the guide 24a.
It is slidably supported by b along its longitudinal direction,
It is opposed to the axial end of the stator body 22 with a gap g. Reference numeral 25 is a braking plate, and the braking plate 25 is fixed to the arm 23b by press-fitting the tip of the arm 23b into the outer peripheral portion thereof. Reference numeral 26 is a braking spring for pressing the armature 24 against the lining 3 when it is not excited, and this braking spring 26 is formed by a web spring and is mounted between the resin 7 of the stator body 22 and the armature 24. . The structure, the mounting position, etc. of the braking spring for urging the armature 24 are not limited to those described above, and when the gap between the hollow portion of the stator body 22 and the rotary shaft 2 is large, A compression coil spring (not shown) is arranged coaxially with the rotary shaft 2 in this gap, and the compression coil spring is fixed to the fixing portion 23a of the mounting plate 23.
It may be mounted between the armature and the armature 24.

In the thus configured electromagnetic braking device, when the coil 6 is excited, the armature 24 is moved along the arm 23b of the stator 21 and magnetically attracted to the stator body 22. When the energization of the motor 1 and the coil 6 is stopped, the armature 24 is not magnetically attracted to the stator main body 22 and is pressed against the lining 3 by the elastic force of the web spring 26.

Therefore, according to the present invention, the stator main body 22 can be formed by press-forming the plate material,
It can be manufactured without performing cutting such as punching. Further, also in the mounting plate 23, similarly to the stator body 22, it is possible to bend and plate the plate material so that the arm 23b is provided parallel to the axial direction of the stator body 22, and the armature 24 also guides the armature 24. This arm 2 in 24a
Since it can be assembled only by inserting 3b, machining such as cutting is almost unnecessary when manufacturing the stator 21.
When manufacturing the stator body 22, the outer diameter is
It goes without saying that the size is set large enough not to interfere with the bolt 8 for attaching the stator body 22 to the motor 1 and the bolt 16 for fixing the cover 15.

Although the armature 24 is supported by the three arms 23b in the present embodiment, the present invention is not limited to such a limitation, and the number of the arms 23b can be appropriately changed.

Further, the electromagnetic braking device according to the present invention is provided with an arm of the stator 21.
Since the armature 24 is directly supported by the 23b, the bush used conventionally is unnecessary, and the diameter of the lining 3 can be increased without being interfered by the bush. Therefore, the area of the friction surface is increased,
The coil 6 can be downsized, or the outer diameter of the stator body 22 can be set small.

〔The invention's effect〕

As described above, in the electromagnetic braking device according to the present invention, the stator is a stator main body that is press-molded into an annular shape having a recess in which the exciting coil is mounted, and the armature is movable with respect to the stator main body. A plurality of arms that are supported by the armature support member integrally provided,
The arm is bent and formed on the outer peripheral side of the stator main body with its longitudinal direction parallel to the axial direction of the stator main body, and the braking plate is fixed to the tip end of the arm. Since the cutting process is unnecessary, the manufacturing work of the stator is simplified. Therefore, the time required to manufacture the stator is shortened, and the manufacturing cost can be kept low.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an electromagnetic braking device according to the present invention, FIG. 2 is a side view showing an essential part, FIG. 3 is a front view showing the same, and FIG.
FIG. 5 is a side sectional view showing a conventional electromagnetic braking device, FIG. 5 is a sectional view of the same braking device portion, and FIG. 6 is a front view of a conventional stator. 2 ... Rotary axis, 3 ... lining, 6 ... coil, 21 ...
… Stator, 22 …… Stator body, 23 …… Mounting plate,
23b ... arm, 24 ... armature, 25 ... braking plate.

Claims (1)

[Claims] 1. A stator having a built-in excitation coil, in which an armature is magnetically attracted, and a braking spring for pressing the armature against a friction plate of a shaft to be brake provided coaxially with the stator when the armature is not excited. In an electromagnetic braking device that is fixed to the stator and includes a braking plate that brakes the friction plate together with an armature, the stator is press-molded into an annular shape having a recess in which an exciting coil is mounted. And the armature support member integrally provided with a plurality of arms for movably supporting the armature with respect to the stator body, and the arms are provided on the outer peripheral side of the stator body. An electromagnetic braking device, characterized in that the longitudinal direction thereof is parallel to the axial direction of the stator body, and is formed by bending, and the braking plate is fixed to the tip end thereof.