WO2006033149A1

WO2006033149A1 - Electromagnetic brake device

Info

Publication number: WO2006033149A1
Application number: PCT/JP2004/013908
Authority: WO
Inventors: Eikoh Ito; Masanori Hori
Original assignee: I. T. O. Co., Ltd.; Kyowaseiko Co., Ltd.
Priority date: 2004-09-24
Filing date: 2004-09-24
Publication date: 2006-03-30
Also published as: JPWO2006033149A1

Abstract

In an electromagnetic brake device (1), an armature disk (5) is pressed against a fixed disk (7) through a friction disk (6) by a coil spring (9) so as to form the rotation restriction state of a rotary shaft (3) to which the friction disk (6) is attached for integral rotation. When an electromagnet (4) is energized, the armature disk (5) is attracted to release the friction disk (6), so that the rotary shaft (3) is switched to a rotation free state. At this time, the friction disk (6), which is disposed in the front and made of magnetic material, is also magnetically attracted through a through-hole (52) formed in the armature disk (5) and is pressed against the step surface (85) of a cylindrical hub (8), so that it is held in a position where it is out of contact with the two disks (5, 7). Thus, in the brake release state, there is no possibility of producing a defect, such as the friction disk (6) contacting the disks (5, 7) to produce noise or wear.

Description

Specification

Electromagnetic brake device

Technical field

TECHNICAL FIELD [0001] The present invention relates to an electromagnetic brake device attached to a rotary shaft in order to switch a rotary shaft such as a motor rotary shaft between a rotationally restricted state and a rotatable state. Background art

[0002] In an electromagnetic brake device, a friction disk with friction surfaces formed on both sides is attached so as to rotate integrally with a rotation shaft to be controlled, and the armature disk and the fixed disk are coaxial with the friction disk sandwiched between them. Are arranged opposite each other. The armature disk is pressed against the friction disk by a biasing member such as a coil spring.

[0003] The armature disk and the friction disk are slidable in the direction of the central axis of the rotating shaft, and the fixed disk is fixed at a fixed position. Therefore, the armature disk slides by the urging force of the urging member, and a state is formed in which the friction disk is pressed against the fixed disk. As a result, the friction disk that rotates integrally with the rotation shaft is sandwiched between the fixed disk and armature disk with a predetermined pressing force, and the rotation force of the rotation shaft (brake) is generated by the friction force generated between them. State) is formed.

[0004] An electromagnet composed of a yoke and a coil is arranged on the rear side of the armature disk (the side opposite to the friction disk). It is attracted by the magnetic force against the urging force of. As a result, the armature disk slides in the direction away from the fixed disk force, and the rotationally constrained force friction disk by the fixed disk and the armature disk is released. That is, the rotating shaft that rotates integrally with the friction disk switches to a rotatable state (brake release state). When the electromagnet is demagnetized, it returns to the rotation restraint state of the rotating shaft.

Disclosure of the invention

Problems to be solved by the invention

[0005] Here, in a state where the rotating shaft is freely rotatable, the armature disk attracted by the magnetic force is held at a slide position separated from the fixed disk cage by a predetermined distance. Therefore The friction disk positioned between the fixed disk and the armature disk is slidable in the direction of the central axis of the rotating shaft between them. That is, the slide position becomes indefinite. For this reason, for example, if the friction disk rotating integrally with the rotating shaft slides toward the armature disk, the friction disk may rotate while making frictional contact with the armature disk. Conversely, if the friction disk slides toward the fixed disk, it may rotate while making frictional contact with the fixed disk. If the friction plate rotates while being in frictional contact, noise is generated and abrasion powder is generated, which is not preferable.

An object of the present invention is to propose an electromagnetic brake device in which a friction plate that rotates integrally with a rotation shaft to be controlled does not come into contact with an armature disk and a fixed disk in a brake released state. is there.

Means for solving the problem

In order to achieve the above object, an electromagnetic brake device of the present invention includes:

A slide disk that rotates integrally with the rotary shaft and is slidable in the direction of the central axis of the rotary shaft;

A stationary disk coaxially disposed opposite to one side of the slide disk, a armature disk disposed coaxially opposed to the other side of the slide disk, and slidable in the direction of the central axis;

An urging member that restrains rotation of the rotating shaft by sandwiching the slide disk and pressing the armature disk against the fixed disk;

An electromagnet capable of generating a magnetic force for attracting the armature disk in a direction away from the slide disk cover against the urging force of the urging member in order to release the rotation restraint state of the rotating shaft;

A friction surface formed on both surfaces of the slide disk, or a surface of the fixed disk and the armature disk on the slide disk side;

The slide disk is also formed with magnetic material force,

The armature disk has a magnetic transmission part,

The slide disk is attracted by the magnetic force through the magnetic transmission part, and the fixed disk force is also kept away. [0008] Here, a through hole or a notch formed in the armature disk can be used as the magnetic transmission part.

[0009] Further, in the case where the yoke force of the electromagnet is provided with a yoke having an annular end surface centered on the central axis, at a position facing the annular end surface of the armature disk, The through-holes formed at equiangular intervals along the circumferential direction can be used as a magnetic transmission part.

Next, the electromagnetic brake device of the present invention has a holding mechanism that holds the slide disk attracted by the magnetic force at a slide position that does not contact the armature disk. ! /

[0011] The holding mechanism abuts the rotating shaft side engaging portion when the rotating shaft side engaging portion formed on the rotating shaft side and the slide disk slide to the armature disk side. A disc-side engaging portion formed on the slide disc can be configured.

[0012] When the slide disk is attached to the rotary shaft via a cylindrical hub fixed concentrically to the outer peripheral surface of the rotary shaft, the rotary shaft side engaging portion of the holding mechanism Is a stepped surface formed on the outer peripheral surface of a cylindrical hub fixed concentrically to the outer peripheral surface of the rotating shaft, and the disk-side engaging portion is the center where the cylindrical hub formed on the slide disk is inserted It can be the inner peripheral edge of the hole.

In the electromagnetic brake device of the present invention, a magnetic transmission part is formed on an armature disk that forms a state where the electromagnet and the slide disk are magnetically cut off, and the slide disk is formed of a magnetic material. is doing. Therefore, when the armature disk is sucked by the electromagnet, that is, in the brake released state, the slide disk made of the magnetic material is simultaneously sucked. Therefore, the slide disk that rotates integrally with the rotary shaft is held at a slide position away from the fixed disk cassette. Therefore, according to the present invention, it is possible to avoid rotating while contacting the slide disk force fixed disk that rotates together with the rotating shaft. Therefore, it is possible to prevent the generation of noise accompanying the rotation in the contact state and the generation of wear powder.

[0014] When the holding mechanism is provided, the slide disk that rotates integrally with the rotating shaft is held at a position apart from the fixed disk and the armature disk cover. Rotating while touching can be avoided. Therefore, it is possible to reliably prevent the generation of noise and wear powder due to rotation in contact.

[0015] Further, according to the present invention, the magnetic disk is formed by a through hole or the like opened in the armature disk, and the slide disk is formed by a magnetic material cover, whereby the slide disk is attracted by the electromagnet. In order to prevent contact with the fixed disk. Therefore, the traction force that causes an increase in the number of parts is advantageous in that the contact between the slide disk and the fixed disk in the brake released state can be avoided with a simple configuration.

Brief Description of Drawings

FIG. 1A is a cross-sectional view of an electromagnetic brake device to which the present invention is applied.

FIG. 1B is an end view of an electromagnetic brake device to which the present invention is applied.

FIG. 2 is an exploded perspective view of the electromagnetic brake device.

FIG. 3A is an explanatory view showing a brake state of the electromagnetic brake device.

FIG. 3B is an explanatory view showing a brake release state of the electromagnetic brake device.

Explanation of symbols

[0017] 1 Electromagnetic brake device

2 Motor

3 Motor rotation shaft

3a Center axis

4 Electromagnet

41 York

42 Koinole

5 Armature disc

52 Through hole (magnetic transmission part)

6 Friction disc (slide disc)

61 Lining retaining disc

61a Inner peripheral edge of center hole

63, 64 lining layer

7 Fixed disk 8 Cylindrical hub

85 steps

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of an electromagnetic brake device to which the present invention is applied will be described with reference to the drawings.

1A and 1B are a cross-sectional view and an end surface portion showing the electromagnetic brake device of this example, and FIG. 2 is an exploded perspective view thereof. The electromagnetic brake device 1 of this example is attached to the rotating shaft 3 of the motor 2, for example, and is used to switch the rotating shaft 3 between a rotation restraint state (brake state) and a rotatable state (brake release state). It is done.

[0020] (Overall configuration)

The electromagnetic brake device 1 has an electromagnet 4, an armature disk 5, a friction disk 6 (slide disk), and a fixed disk 7. These are the central axis 3a of the rotary shaft 3 from the motor 2 side. Are arranged in this order in the direction of. The friction disk 6 has friction surfaces on both sides, and is attached to the rotating shaft 3 to be controlled via the cylindrical hub 8 so as to rotate integrally. The armature disk 5 arranged opposite to the rear side of the friction disk 6 is pressed against the friction disk 5 by a plurality of coil springs 9 (biasing members).

The armature disk 5 and the friction disk 6 can be slid in the direction of the central axis 3 a of the rotating shaft 3. On the other hand, the position of the fixed disk 7 that is opposed to the front side of the friction disk 6 is fixed. Therefore, the state where the armature disk 5 is slid by the spring force of the coil spring 9 and the friction disk 6 is pressed against the fixed disk 7 is formed. As a result, the friction disk 6 that rotates together with the rotating shaft 3 is sandwiched between the fixed disk 7 and the armature disk 5 with a predetermined pressing force, and the frictional force generated between them causes the rotating shaft 3 to rotate. A brake state is formed.

[0022] When the electromagnet 4 arranged on the rear side of the armature disk 5 is excited, the armature disk 5 also having a ferromagnetic material force is attracted to the rear side by the magnetic force against the spring force of the coil spring 9. . As a result, the armature disk 5 slides away from the fixed disk 7, the rotational restraint state force of the fixed disk 7 and the armature disk 5 is released, and the friction disk 6 is released and rotates together with the friction disk 6. Rotation shaft 3 switches to the brake release state Change. When the electromagnet 4 is demagnetized, the electromagnetic brake device 1 returns to the brake state in which the rotation of the rotary shaft 3 is restricted.

[0023] (Configuration of each part)

Next, the configuration of each unit will be described in detail. First, the electromagnet 4 includes a yoke 41 and a coil 42. The yoke 41 has an annular shape as a whole, and an annular recess 43 having a certain depth is opened on the front end surface thereof. A coil 42 is attached in an annular shape to the annular recess 43 and sealed with a sealing material 44. In the outer cylindrical portion 45 of the yoke 41, screw insertion holes 46 extending in a direction parallel to the central axis are formed at equal angular intervals. In this example, three screw through holes 46 are formed at intervals of 120 degrees. Insert the rotating shaft 3 into the center hole 4 lb that passes through the center of the yoke 41, and screw the fixing screw 47 that is inserted into each screw insertion hole 46 into the screw hole formed in the corresponding part on the front of the motor. By fixing, the electromagnet 4 is fixed coaxially on the front surface of the motor.

A screw hole 48 is formed in the outer cylindrical portion 45 of the yoke 41 at a position offset by 60 degrees from the screw insertion hole 46. Each screw hole 48 is a screw hole having a certain depth from the annular end surface 45a of the outer cylindrical portion 45. The annular end surface 45a is formed with a circular recess 49 for mounting a spring having a predetermined depth extending in the direction of the central axis at equal angular intervals. In this example, six screws are formed at an angular interval of 60 degrees at a portion offset by 30 degrees so as not to interfere with the screw insertion hole 46 and the screw hole 48. A coil spring 9 is attached to each circular recess 49.

[0025] Next, the fixed disk 7 arranged on the foremost side has the same outer diameter as that of the electromagnet 4, and extends along the center hole 71 passing through the center and the outer peripheral edge portion thereof. And three screw holes 72 formed at an angular interval of 120 degrees. From the front of the fixed disk 7, three fastening screws 73 are screwed and fixed to the screw holes 48 formed on the front surface of the magnet 4 through the screw holes 72 and the cylindrical spacers 74 of a predetermined length. ing. Therefore, the fixed disk 7 is fixed at a certain distance from the front surface of the electromagnet with the cylindrical spacer 74 interposed therebetween. In the outer peripheral edge portion of the fixed disk 7, U-grooves 75 that are notched in a U shape are formed at three locations that are offset by 60 degrees with respect to the screw holes 72. The U-groove 75 is a driver insertion groove used when the fixing screw 47 for fixing the electromagnet is screwed. [0026] Between the electromagnet 4 and the fixed disk 7 fixed at a predetermined interval with respect to the front surface, the armature disk 5 disposed on the electromagnet 4 side It is formed. The armature disk 5 has substantially the same size as the outer diameter of the yoke 41, and the center hole 51 has the same diameter as the yoke center hole. In addition, the armature disk 5 is formed with a plurality of through holes 52 that function as magnetic transmission portions at equal angular intervals in a portion facing the annular recess 43 of the yoke 41. In this example, four through holes 52 are formed at intervals of 90 degrees. Further, on the outer peripheral edge of the armature disk 5, three U grooves 54 cut out in a U shape at an angular interval of 120 degrees are formed. Further, three U grooves 55 are formed at an angular position offset by 60 degrees with respect to the U groove 54.

[0027] The three U-grooves 54 pass in the direction of the central axis in a state in which the cylindrical spacer is slidable. Accordingly, the armature disk 5 is held in a coaxial state with respect to the electromagnet 4 by the cylindrical spacer and is slidable in the direction of the central axis. The remaining three U-grooves 55 are driver insertion grooves used when screwing the fixing screws 47 for fixing the electromagnet.

[0028] Next, the friction disk 6 positioned on the front side of the armature disk 5 includes a lining holding disk 62 in which a center hole 61 is formed, and a front end face and a rear end face of the lining holding disk 62. The lining layers 63 and 64 which are formed and also have a high friction material force are provided. The lining layers 63 and 64 are formed in an annular shape with a constant width, and form the friction surface of the friction disk 6. The outer diameter of the friction disk 6 is smaller than that of the fixed disk 7 and the armature disk 5 so as not to interfere with the U-shaped grooves 74 and 54 and the fixing screw.

[0029] The cylindrical hub 8 to which the friction disk 6 is attached to the rotary shaft 3 is provided with a central through hole 81 of a size capable of fitting the rotary shaft 3, and is fixed to the rotary shaft 3 inserted therethrough. Fastened with screws 82. The cylindrical hub 8 has a circular contour portion 83 with a circular outer peripheral surface at the rear end portion, and the other portions are flattened at an angular interval of 90 degrees on the outer peripheral surface having the same outer diameter as the circular contour portion 83. A rectangular contour portion 84 having a substantially rectangular contour shape obtained by cutting into a rectangular shape is formed, and a step surface 85 facing forward is formed between them.

[0030] The center hole of the friction disc 6 is complementary to receive the rectangular contour portion 83 in a slidable state. It has a typical inner peripheral surface shape. Therefore, the friction disk 6 is attached to the cylindrical hub 8 so as to rotate integrally and be slidable in the direction of the central axis. When the friction disk 6 slides to the rear side (armature disk 5 side), the inner peripheral edge portion 6 la of the rectangular central hole hits the step surface 85, and the sliding of the friction disk 6 is restricted.

[0031] Here, a coil screw 9 is mounted on a circular recess 49 for mounting the spring formed on the front surface of the electromagnet, and the front half of the coil screw 9 protrudes in the direction of the central axis, so that the armature disk 5 It hits the back. Therefore, the armature disk 5 is always pressed forward by the spring force of the coil spring 9. The distance between the front surface of the electromagnet and the fixed disk 7 is such that the friction disk 6 is sandwiched by the spring force of the coil spring 9 and the armature disk 5 is pressed against the fixed disk 7 by a predetermined pressing force. Is set.

[0032] (Description of operation)

The operation of the electromagnetic brake device 1 will be described with reference to FIGS. 3A and 3B. First, when the electromagnet 4 is in a non-excited state, the armature disk 5 and the friction disk 6 are pressed against the fixed disk 7 by the spring force of the coil spring 9, as shown in FIG. 3A. As a result, a braking force acts on the rotary shaft 3 via the friction disk 6 by the frictional force generated between them. Therefore, the rotating shaft 3 is held in a rotation restraint state (brake state).

In this state, when the electromagnet 4 is excited, as shown in FIG. 3B, the armature disk 5 is attracted by the generated magnetic force and slides backward by a predetermined amount. As a result, the friction disk 6 is released from the rotationally restricted state sandwiched between the fixed disk 7 and the armature disk 5, and the rotary shaft 3 is switched to a freely rotatable state (brake release state).

[0034] Here, since the armature disk 5 that also has ferromagnetic material force has four circular through holes 52, the friction disk 6 located on the front side also has a magnetic force. Acts. Therefore, the friction disk 6 made of a magnetic material is also attracted and slides backward. Further, a step surface 85 is formed on the outer peripheral surface of the cylindrical hub 8 on which the friction disk 6 slides, and sliding of the friction disk 6 is prevented when it contacts the step surface 85.

In this example, as shown in FIG. 3B, the friction disk 6 force prevented from sliding by the stepped surface 85 is positioned so as not to contact the armature disk 5. Therefore, this example In the electromagnetic brake device 1, in the brake released state, the friction disk 6 is pressed against the step surface 85 by the magnetic force of the electromagnet 4, and the position in the sliding direction is fixed. Therefore, in the state where the rotating shaft 3 is rotating, the friction disk 6 that rotates integrally with the rotating shaft 3 rotates while contacting the armature disk 5 and the fixed disk 7 to generate noise and wear. This can prevent the harmful effect.

[0036] (Other embodiments)

In addition, said example shows an example of this invention and this invention is not limited to each structure of the said Example. For example, as a magnetic transmission part formed on the armature disk 5, a notch groove formed by notching the disk of its outer peripheral surface or inner peripheral surface force to a predetermined depth instead of a through hole. It may be. Further, the holding mechanism for preventing the friction disk 6 from sliding may be a mechanism other than the force as an engagement structure between the step surface 85 and the inner peripheral edge portion 61a on the friction disk side. For example, the cylindrical hub 8 may be formed of a cylindrical member having the same diameter, and a circular ring having a larger diameter at the rear end thereof may be fixed in a coaxial state, and the sliding of the friction disk 6 may be prevented by the circular ring. .

[0037] Next, in the above example, a friction disk having friction surfaces formed on both sides is used as the slide disk. Instead, a friction surface is formed on the surface of the armature disc on the slide disc side, and a friction surface is formed on the surface of the fixed disc on the slide disc side. It is also possible to

Claims

The scope of the claims

[1] A slide disk that rotates integrally with the rotating shaft and is slidable in the direction of the central axis of the rotating shaft;

The slide disk is also formed with magnetic material force,

The armature disk is formed with a magnetic transmission part,

The electromagnetic brake device is characterized in that the slide disk is attracted by the magnetic force through the magnetic transmission part, and the fixed disk force is also kept away.

[2] In claim 1,

The electromagnetic brake device, wherein the magnetic transmission part is a through hole or a notch formed in the armature disk.

[3] In claim 2,

The electromagnet includes a yoke having an annular end surface centered on the central axis, and the magnetic transmission portion of the armature disk is arranged along a circumferential direction at a position facing the annular end surface. An electromagnetic brake device characterized by being the through holes formed at equal angular intervals.

[4] In claim 1, 2 or 3, An electromagnetic brake device comprising: a holding mechanism that holds the slide disk attracted by the magnetic force at a slide position without contacting the armature disk.

[5] In claim 4,

The holding mechanism includes a rotating shaft side engaging portion formed on the rotating shaft side, and the slide disc that contacts the rotating shaft side engaging portion when the slide disk slides to the armature disk side. An electromagnetic brake device comprising: a disc side engaging portion formed on the side of the disc.

[6] In claim 5,

The rotating shaft side engaging portion is a step surface formed on the outer peripheral surface of a cylindrical hub fixed concentrically to the outer peripheral surface of the rotating shaft,

The electromagnetic brake device according to claim 1, wherein the disk side engaging portion is an inner peripheral edge portion of a center hole formed in the slide disk into which the cylindrical hub is inserted.