JP5471502B2 - Non-excitation electromagnetic brake - Google Patents

Description

  The present invention relates to a non-excitation operation type electromagnetic brake.

  2. Description of the Related Art Conventionally, various non-excitation actuating electromagnetic brake structures have been proposed for miniaturization, low power consumption, and high torque with respect to non-excitation actuating electromagnetic brakes used in servo motors and various robots.

  Currently, the non-excitation operation type electromagnetic brake has been reduced in size to the extent of having a diameter of about 30φ, for example, there is a non-excitation operation type electromagnetic brake as described in Patent Document 1, for example, FIG. The structure as shown in is adopted. FIG. 2 is a schematic longitudinal sectional view showing the structure of a conventional small non-excitation operation type electromagnetic brake.

  As shown in FIG. 2, a conventional small non-excitation operation type electromagnetic brake 100 includes a yoke 102, a coil body 104 built in the yoke 102, a plate 106 disposed opposite to the yoke 102, and between the yoke 102 and the plate 106. Is disposed between the yoke 102 and the brake 108 so that it cannot rotate about the reference axis C and can move in the direction of the reference axis C. , The armature 110 disposed on the plate, the plate 106, and a bolt 112 for fastening the armature 110 to the yoke 102.

  The yoke 102 includes an opening 102a provided in the center around the reference axis C, and an annular recess 102b provided outside the opening 102a when viewed from the reference axis C, and is built in the recess 102b. The coil body 104 is composed of a bobbin (core body) 104a and an exciting coil 104b wound around the bobbin 104a.

  In addition, an opening 102c is provided outside the recess 102b when viewed from the reference axis C, and a compression spring that urges the armature 110 against the braking portion 108 is incorporated therein, although not shown. . Further, the bolt 112 fastens the plate 106 and the armature 110 to the yoke 102 via the collar 116.

Japanese Patent Application No. 5-22730

  However, the conventional small non-excitation actuating electromagnetic brake 100 as described above is configured to have a positional relationship such that the coil body 104 and the fastening member 112 overlap when viewed from a direction substantially perpendicular to the reference axis. In addition, since the bolt 112 is attached via the collar 116, there is a problem that there is a limit to miniaturization both in the reference axis C direction and in the radial direction viewed from the reference axis C (miniaturization).

  Furthermore, in the above-described conventional small non-excitation actuated electromagnetic brake 100, the coil body 104 built in the recess 102b includes the bobbin 104a. In order to reduce the size, the radial direction viewed from the reference axis C is used. In this case, it is difficult to secure the width of the cylindrical portion 102d at the center of the yoke 102 and the width of the recess 102b (that is, the space of the exciting coil 104b).

  As a result, the number of strokes of the exciting coil 104b cannot be increased, and in order to apply a magnetic attraction force larger than the biasing force of the compression spring to the armature 110, a large current must be passed through the exciting coil 104b. In addition, there is a problem of increasing the amount of heat generation (large magnetic attraction, low power consumption and low heat generation, contrary to downsizing).

  Therefore, the present invention has been made in view of the above-described problems of the prior art, can secure a sufficient magnetic path and magnetic attractive force, hardly increase the power consumption and the heat generation amount, and compared with the prior art. It is an object of the present invention to provide a novel structure of a non-excited operation type electromagnetic brake that is further downsized.

  As a result of intensive research to achieve the above object, the present inventor has found that in the structure of a non-excitation actuated electromagnetic brake, the positional relationship in which the coil and the bolt do not overlap as seen from the direction of the normal line of the longitudinal section of the yoke. If the configuration as described above can be adopted, it has been found that miniaturization can be improved both in the reference axis C direction and in the radial direction as viewed from the reference axis C, and the present invention has been completed.

In order to solve the above problems, the present invention provides:
A yoke with an excitation coil;
A plate disposed opposite the yoke;
A braking portion disposed between the yoke and the plate and provided to be rotatable around a reference axis of the yoke;
An armature disposed between the yoke and the braking portion and disposed so as not to rotate around the reference axis and to move in the direction of the reference axis;
A fastening member for fastening the plate to the yoke;
Comprising
The excitation coil and the fastening member do not overlap with each other when viewed from a direction substantially perpendicular to the reference axis, and the excitation coil and at least a part of the fastening member overlap with each other when viewed from the reference axis direction. And
The yoke the fastening member is fastened to the formed recess, the inner space of the concave tip portion capable of accommodating of the fastening member, provides a non-excitation type electromagnetic brake that are isolated from the arrangement space of the exciting coil To do.

  In the non-excitation actuating electromagnetic brake of the present invention having such a configuration, since the excitation coil and the fastening member have a positional relationship that does not overlap when viewed from a direction substantially orthogonal to the reference axis, the diameter is viewed from the reference axis C. In the direction, the excitation coil and the fastening part overlap each other, and the width of the non-excitation actuated electromagnetic brake is smaller than the sum of the width of the excitation coil and the fastening part, enabling a reduction in size. It is.

  In the above-described non-excitation operation type electromagnetic brake of the present invention, the yoke is constituted by a first yoke part constituted by a cylindrical member having a flange-like portion and a cylindrical member covering the first yoke part. It is preferable that the exciting coil is directly wound around the cylindrical portion of the first yoke portion. Here, “directly wound around the cylindrical portion” means that the exciting coil is not wound around a core body such as a bobbin, and for example, is wound around the cylindrical portion via a film-like insulator or the like. Including the rotated mode.

  In the non-excitation operation type electromagnetic brake of the present invention having such a configuration, since the excitation coil is wound directly on the cylindrical portion of the first yoke portion, it is substantially from the normal direction of the longitudinal section of the yoke. Thus, it is possible to achieve further downsizing in the radial direction viewed from the reference axis C, and the yoke can be reduced in the radial direction viewed from the reference axis C by an amount corresponding to the volume and width of the bobbin used so far. A width and a coil space can be secured, and a large magnetic attractive force, low power consumption, and low heat generation can be realized without sacrificing downsizing.

  In the non-excitation operation type electromagnetic brake of the present invention, the first yoke portion 2a and the second yoke portion 2b may be integrated to constitute the yoke 2.

  In the non-excitation operation type electromagnetic brake of the present invention having such a configuration, the number of parts can be reduced, and there is an advantage in, for example, the manufacturing process and management.

  According to the present invention, it is possible to ensure a sufficient magnetic path and magnetic attraction force, hardly increase power consumption and heat generation, and a novel structure of a non-excitation operation type electromagnetic brake that is more compact than conventional ones. Can be provided.

It is a schematic longitudinal cross-sectional view of one Embodiment of the non-excitation actuated electromagnetic brake of this invention. It is a schematic longitudinal cross-sectional view of the conventional non-excitation operation type electromagnetic brake.

  Hereinafter, representative embodiments of the present invention will be described with reference to the drawings. In the following description, the same or corresponding parts are denoted by the same reference numerals, and redundant description may be omitted. In addition, the shape and size of each member in each drawing may not necessarily represent the shape and size for achieving the effects of the present invention with high accuracy.

  As shown in FIG. 1, a non-excitation actuating electromagnetic brake 1 according to this embodiment includes a yoke 2 having an excitation coil 4, a plate 6 disposed opposite to the yoke 2, and between the yoke 2 and the plate 6. The brake unit 8 disposed so as to be rotatable about the reference axis C of the yoke 2 and disposed between the yoke 2 and the brake unit 8 so as not to be rotatable about the reference axis C and movable in the direction of the reference axis C The armature 10 disposed on the armature 10, a bolt 12 that is a fastening member for fastening the plate 6 to the yoke 2, a lead wire 14 connected to a power source for energizing the exciting coil 4, and the armature 10 pressed against the braking portion 8. And a compression spring 18 that is an urging portion for urging the urging portion.

  The bolt 12 fastens the plate 6 and the armature 10 to the yoke 2 (2a) via the collar 16.

  The yoke 2 is made of a ferromagnetic material such as iron and has a so-called two-body structure composed of a first yoke portion 2a and a second yoke portion 2b, and is wound around the first yoke portion 2a. The exciting coil 4 is built in between the first yoke part 2a and the second yoke part 2b. The first yoke part 2a and the second yoke part 2b are, for example, a chemical connecting means such as an adhesive, a combination of a bolt and a nut, a combination of a concave part and a convex part, or a combination of these and a fitting part, press fitting It may be connected by a conventionally known joining means such as a physical connecting means such as shrink fitting.

The first yoke portion 2a has an outer end surface 2a ₁ and an engagement end surface 2a ₂ which are substantially orthogonal to the reference axis (center axis or the rotation axis of the motor) line C and are substantially parallel to each other, and It is comprised with the cylindrical member which has a flange-shaped part. The second yoke portion 2b is provided at a tubular member that contacts the flange-shaped portion of the first yoke portion 2a and covers the first yoke portion 2a, and an end of the tubular member on the armature 10 side. And a step 2b ₃ having a recess 2b ₁ for receiving the bolt 12 and a recess 2b ₂ having a compression spring 18 therein. An engaging end surface 2b ₄ is located on the armature 10 side of the stepped portion 2b ₃ .

  The exciting coil 4 is not wound around a bobbin or the like but is directly wound around a cylindrical member constituting the first yoke portion 2a. As the metal wire constituting the exciting coil 4, those having various cross sections can be adopted, but the magnetic attraction force can be maximized by making the winding density and the contact area with the cylindrical member of the first yoke portion 2 a maximum. It is preferable to use a so-called rectangular wire having a rectangular cross section from the viewpoint of improving the image quality.

The plate 6 is formed in a substantially disk shape, and is disposed so as to oppose the engagement end surface 2a ₂ of the first yoke portion 2a and the second yoke portion 2b and the 2b ₄ side. A central opening 6 is formed with a through-opening 6a through which the rotation shaft of the motor is inserted. Although the present invention is not limited to this, the opening diameter of the opening 6 a in this embodiment is larger than the opening diameter of the opening 2 c of the yoke 2. A braking portion 8 is provided around the reference axis C on the yoke 2 side of the plate 6.

  The braking portion 8 has a substantially disk shape whose outer diameter is smaller than that of the plate 6, and a through-opening 8 a for inserting the rotation shaft of the motor is formed in the central portion of the braking portion 8 on the reference axis C. Yes. Although the present invention is not limited to this, the opening diameter of the opening 8 a in this embodiment is larger than the opening diameter of the opening 2 c of the yoke 2 and smaller than the opening diameter of the opening 6 a of the plate 6.

Between the engagement end surface 2a ₂ of the first yoke portion 2a and 2b ₄ of the second yoke portion 2b and the braking portion 8, the yoke 2 cannot rotate around the reference axis C, and the reference axis C An armature 10 supported so as to be movable in the direction is arranged. The armature 10 is made of a ferromagnetic material such as iron formed in a disk shape, and an opening 10a that penetrates the rotation shaft of the motor is formed at the center of the armature 10 on the reference axis C. . Although this invention is not necessarily limited to this, the opening diameter of this opening 10a in this embodiment is substantially the same as the opening 2c of the 1st yoke 2a.

A concave portion 2b ₂ is formed in the engagement end surface 2b ₄ of the second yoke portion 2b, and a compression spring 18 that is a biasing portion for the armature 10 is incorporated therein. The armature 10 supported so as to be movable in the direction of the reference axis C is pressed against the braking portion 8 by the compression spring 18. In FIG. 1, for convenience, one recess 2b ₂ and compression spring 18 are shown, but actually, a plurality of one recess 2b ₂ and compression spring 18 are engaged with the second yoke portion 2b. They are arranged at equal intervals in the circumferential direction on the end face 2b _4. What is necessary is just to select suitably about the number, compression strength, arrangement | positioning, etc. of this compression spring 18 so that the original effect of the non-excitation actuating type electromagnetic brake 1 may be produced.

The engagement end surface 2b ₄ of the second yoke portion 2b is further formed with a recess 2b ₁ , and the bolt 12 inserted through the through hole 6b provided in the plate 6 and the through hole 10b provided in the armature 10. Is fastened to the recess 2b ₁ to fix the plate 6 and the armature 10 to the yoke 2.

Thus, the recess in the present embodiment, viewed in the direction substantially perpendicular to the reference axis C, the exciting coil 4 and the bolt 12 and compression spring 18 (further incorporating a recess 2b ₁ and the compression spring 18 incorporates a bolt 12 2b ₂ ) and the positional relationship (when viewed from the direction of the reference axis C, the exciting coil 4, the bolt 12 and the compression spring 18 (and the recess 2b ₁ containing the bolt 12 and the recess 2b ₂ containing the compression spring 18) Therefore, downsizing is realized in the radial direction viewed from the reference axis C.

  In the present embodiment, the yoke 2 is composed of the first yoke portion 2a and the second yoke portion 2b, and the exciting coil 4 is directly attached to the cylindrical portion of the first yoke portion 2a without using a bobbin or the like. Since it is wound, further downsizing is realized in the radial direction viewed from the reference axis C, and the yoke 2 has a reduced volume and width corresponding to the omitted bobbin in the radial direction viewed from the reference axis C. The width and coil space are secured, and a large magnetic attraction, low power consumption, and low heat generation are realized without sacrificing downsizing.

  The typical embodiments of the non-excitation operation type electromagnetic brake of the present invention have been described above, but the present invention is not limited to these, and various design changes can be made within the scope of the technical idea of the present invention. It is.

  For example, in the first yoke 2a, in order to form a screw hole for fixing the non-excitation actuating electromagnetic brake 1 to other equipment with a screw or a screw hole at a position overlapping the exciting coil 4 when viewed from the reference axis C direction. The aspect in which the screw hole margin is formed may be used. Compared to the conventional non-excitation actuating electromagnetic brake 100 shown in FIG. 2, in the non-excitation actuating electromagnetic brake 1 shown in FIG. 1, the left portion of the first yoke 2a is thicker. It can be suitably employed.

  Further, for example, in the above-described embodiment, for convenience, in the same longitudinal sectional view of FIG. 1, the aspect illustrated so that the recess 2b1 containing the bolt 12 and the recess 2b2 containing the compression spring 18 appear at the same cross-sectional position. As described above, the number and position of the compression springs 18 and the position of the bolts 12 can be changed as appropriate.

  Moreover, in the said embodiment, although the 1st yoke 2a and the 2nd yoke 2b were demonstrated as a different member, even if the 1st yoke 2a and the 2nd yoke 2b have an integral structure. Good.

  The non-excitation operation type electromagnetic brake of the present invention can be suitably used as a small non-excitation operation type electromagnetic brake, particularly as a non-excitation operation type electromagnetic brake of a small motor such as a servo motor or a robot motor.

1, 100 ... Non-excitation electromagnetic brake,
2, 102 ... Yoke,
2a ... first yoke,
2b ... second yoke,
4, 104b ... excitation coil,
6, 106 ... Plate,
8, 108 ... braking part,
10, 110 ... armature,
12, 112 ... bolts,
14, 114 ... lead wires,
16, 116 ... color,
18 ... compression spring,
104a ... bobbin.

Claims (3)

A yoke with an excitation coil;
A plate disposed opposite the yoke;
A braking portion disposed between the yoke and the plate and provided to be rotatable around a reference axis of the yoke;
An armature disposed between the yoke and the braking portion and disposed so as not to rotate around the reference axis and to move in the direction of the reference axis;
A fastening member for fastening the plate to the yoke;
Comprising
The excitation coil and the fastening member do not overlap with each other when viewed from a direction substantially perpendicular to the reference axis, and the excitation coil and at least a part of the fastening member overlap with each other when viewed from the reference axis direction. and,
The fastening member is tightened, the inner space capable of accommodating the recess of the tip portion of the fastening member, non-excitation type electromagnetic brake that are isolated from the arrangement space of the exciting coil in a recess formed in the yoke. The yoke is composed of a first yoke part composed of a cylindrical member having a flange-shaped part, and a second yoke part composed of a cylindrical member covering the first yoke part,
The exciting coil is wound directly on the cylindrical portion of the first yoke portion;
The non-excitation operation type electromagnetic brake according to claim 1. The first yoke part and the second yoke part integrally constitute the yoke;
The non-excitation actuated electromagnetic brake according to claim 1 or 2.

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