JP2001263390A - Non-exciting operation type electromagnetic brake and manual releasing device thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-exciting operation type electromagnetic brake capable of accurately readjusting a clearance between a friction plate and an armature when exciting even with a worn friction plate. SOLUTION: A rotating part 20 of a non-exciting operation type electromagnetic brake 10 has a hub 22 fitted on a rotary shaft 2 and a plate main body 22 spline-connected to the hub so as to be integrally rotated with the hub. A fixed part 30 has a magnetic pole body 31 arranged at one side of the plate main body 22 and an armature 32 slidably fitted to the magnetic pole body 31 in the thrust direction. A friction plate 22a is installed in the plate main body 22. A flange part 21b of the hub 21 is formed with plural screw holes 21d along the thrust direction, and a plate adjusting screw 23 is screwed to each hole. The plate adjusting screw 23 abuts on the plate main body 22 at a tip thereof, and the plate main body 22 can be moved toward the armature 32 by fastening the plate adjusting screw 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-excited operation type electromagnetic brake in which braking is applied by the biasing force of a spring when the excitation coil is not energized, and the braking is released when energized. The present invention relates to an improvement with a manual release device that manually releases braking when power is not supplied.

[0002]

2. Description of the Related Art FIG. 11 is an overall longitudinal side view showing an example of a conventional non-excited operation type electromagnetic brake 1, and FIG.
Is a front view as viewed from the right side in the figure. As shown in FIGS. 11 and 12, a conventional non-excited operation type electromagnetic brake 1 has a plate assembly 3 which is fixed to a rotation shaft 2 to be braked and rotates integrally, and a fixed one side of the plate assembly 3. , And an armature 5 disposed between the plate assembly 3 and the magnetic pole body 4.

The plate assembly 3 includes a cylindrical portion 3a surrounding the periphery of the rotary shaft 2 and a disk portion 3b formed integrally with the cylindrical portion 3a. The friction plate 3c is mounted on the facing surface.

The armature 5 is attached to the magnetic pole body 4 so as to be movable in the thrust direction while being guided by guide pins 4a implanted in the magnetic pole body 4. The magnetic pole body 4 has a spring (coil spring) 6 for urging the armature 5 toward the plate assembly 3 and an excitation for attracting the armature 5 to the magnetic pole body 4 against the urging force of the spring 6 when energized. A coil 7 is provided. Reference numeral 7a is a lead wire for supplying power to the exciting coil 7.

According to the above configuration, when power is not supplied to the exciting coil 7, the spring 6 presses the armature 5 against the plate assembly 3, and the friction plate 3 c of the plate assembly 3 comes into contact with the armature 5 and the rotation shaft 2 The rotation is braked. When the excitation coil 7 is energized, the armature 5 separates from the friction plate 3c of the plate assembly 3 and the magnetic pole body 4
Side, and braking is released.

An appropriate gap is required between the friction plate 3c and the armature 5 during excitation so that the friction plate 3c and the armature 5 do not contact each other during excitation, and a predetermined frictional force acts when not excited. . The maximum width of the gap is defined by the positions of the two hexagon nuts 8 screwed to the rotating shaft 2. At the time of initial setting, adjust the hexagon nut 8 and
Is screwed into a screw hole 3d formed in the cylindrical portion 3a along the radial direction in a state where the plate screw 3 is applied to the hexagonal nut 8, and the axial position of the plate assembly 3 is tightened. Are fixed, and the gap width is determined. Of the two hexagon nuts 8, the inner nut is for adjustment and the outer nut is for preventing loosening.

[0007]

In the conventional non-excited operation type electromagnetic brake 1 described above, when the friction plate 3c is worn due to use and the gap width becomes inappropriate, the gap width is readjusted. In this case, the set screw used for the initial setting was loosened once, and the plate assembly was moved to the armature side by tightening the hexagon nut to perform the readjustment. It is difficult to move the plate assembly 3 in the thrust direction even if the set screw is loosened due to the scratches of the unevenness of the rotary shaft 2 generated during the initial setting or the previous adjustment attached to the rotary shaft 2 by the set screw. In such a case, there is a problem that readjustment becomes difficult, and a solution has been demanded.

It is desirable that this type of non-excited operation type electromagnetic brake can be manually released even when the excitation coil cannot be energized due to a power failure, disconnection of wiring to the excitation coil, or the like. However, in the conventional manual release device, since the operation unit is provided in the motor case in which the motor driving the rotating shaft and the electromagnetic brake are both housed, it is necessary to remove the motor case every time the manual release is performed. There was a problem that it took time and effort to operate.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems (problems) of the prior art, and a first object is to provide a friction plate and an armature at the time of excitation even when the friction plate is worn. A second object of the present invention is to provide a non-excited operation type electromagnetic brake capable of appropriately re-adjusting a gap between the electromagnetic brakes, and a manual release of the non-excitation operation type electromagnetic brake capable of manually releasing the braking without removing the motor case. It is to provide a device.

[0010]

SUMMARY OF THE INVENTION In order to achieve the first object, a non-excited operation type electromagnetic brake according to the present invention is provided. By dividing the plate body into a plate body movable in the thrust direction, the position of the plate body with respect to the hub can be changed by a plurality of plate adjusting screws.

That is, according to the first aspect of the present invention, there is provided a non-excited operation type electromagnetic brake comprising a fixedly provided magnetic pole body, a magnetic pole body opposed to the magnetic pole body, and a thrust direction. An armature slidably attached to the pole body, and a hub that integrally rotates while holding a rotation axis;
A plate body that rotates integrally with the hub, and is slidably provided in the thrust direction with respect to the hub;
A plate assembly including a friction plate fixed to the plate body at a position facing the armature; and a plate assembly interposed between the magnetic pole body and the armature, for urging the armature toward the braking side. A spring provided in the magnetic pole body, an exciting coil for attracting the armature to the magnetic pole body side against a biasing force of the spring when energized, and a plurality of screw holes formed in the hub along a thrust direction. And a plurality of plate adjusting screws for adjusting the position of the plate main body in the thrust direction with respect to the armature by screwing the tip to the plate main body.

According to the above configuration, by tightening the plate adjusting screw, the plate body can be moved toward the armature, and the gap between the friction plate of the plate body and the armature can be reset to an appropriate value. .

[0013] In this case, the connection between the hub and the plate body is substantially the following (1), (2),
The configuration shown in (3) can be considered. (1) Spline the plate to the hub. (2) Fix the plate to the hub via a leaf spring. (3) The plate is supported by a plurality of rivet shafts penetrating the hub in the thrust direction, and a push nut is pressed into these shafts from the pole body side. The configurations (2) and (3) can be used alone or in combination with (1).

On the other hand, in order to achieve the second object, the manual release device of the non-excited operation type electromagnetic brake according to the present invention releases the braking manually at the time of non-excitation to achieve the second object. A part of the manual operation unit is exposed to the outside of the motor case to enable operation from outside the motor case. According to this configuration, the braking can be manually released without removing the motor case.

The release manual operation portion has a pair of rotating shafts fixed to the magnetic pole body with the diametrical axis of the magnetic pole body and substantially half the circumference of the magnetic pole body. Is mounted so as to be rotatable with respect to the rotation axis, and
It can be configured to include a lever connected to the armature at a position close to the rotation shaft, and an operation knob fixed to an intermediate portion of the lever toward an outer peripheral direction. In this case, it is desirable that only the operation knob is exposed outside the motor case. Further, the lever can be connected to the armature on the same side as the intermediate portion with respect to the rotation axis, as described in claim 9.

[0016] Alternatively, the manual release section for releasing is provided in claim 1.
As shown in FIG. 0, a pair of rotating shafts having a diameter axis of the magnetic pole body and fixed to the magnetic pole body, and rotatable with respect to the rotating shaft by surrounding the outer circumference of the magnetic pole body for substantially half a circumference. A lever connected to the armature at a position close to the rotation axis, a connecting rod fixed to an intermediate portion of the lever, extending in the thrust direction and projecting from the motor case, and a protrusion of the connecting rod And a wing nut that screws into a screw formed in the portion. In this case, the lever is connected to the armature on the side opposite to the intermediate portion with respect to the rotation axis. It is preferable that the connecting rod is provided with a compression spring that biases the intermediate portion away from the armature.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Three embodiments of a non-excited operation type electromagnetic brake according to the present invention and two embodiments of a manual release device according to the present invention will be described below. First, second,
The third embodiment relates to a non-excited operation type electromagnetic brake, and the fourth and fifth embodiments relate to a manual release device.

First Embodiment FIGS. 1 and 2 show a first embodiment.
2 shows a non-excited operation type electromagnetic brake 10 according to the embodiment of the present invention, and FIG.
2 is a front view of the entirety of FIG. 1 as viewed from the right side.

As shown in FIG. 1, the non-excited operation type electromagnetic brake 10 includes a rotating portion 20 that rotates integrally with the rotation shaft 2 to be braked, and a fixed portion 30 that is fixedly arranged.
The rotating unit 20 includes a hub 21 having a shaft hole with a key groove into which the rotating shaft 2 is fitted, and a plate body 22 that rotates integrally with the hub 21. On the other hand, the fixed part 30 is a magnetic pole body 31 fixedly arranged on one side of the plate body 22.
And an armature 32 attached to the pole body 31 so as to be slidable in the thrust direction between the plate body 22 and the pole body 31.

The hub 21 has a cylindrical portion 21a surrounding the outer periphery of the rotating shaft 2, and a flange portion 21b which protrudes toward the outer periphery at an intermediate portion in the thrust direction. A radial screw hole 21c for screwing a hub set screw (not shown) is formed in a portion on the right side of the flange portion 21b of the cylindrical portion 21a in the drawing, and a disk-shaped plate body is formed in a portion on the left side in the drawing. 22 is spline-coupled so as to be movable in the thrust direction. A friction plate 22a is mounted on a surface of the outer periphery of the plate body 22 facing the armature 32. That is, the plate assembly according to the present embodiment includes the hub 21, the plate body 22, and the friction plate 22a.

The flange 21b of the hub 21 has
A plurality of screw holes 21d are formed along the thrust direction, and plate adjusting screws 23 are screwed into these screw holes 21d, respectively. In this example, the screw holes 21d and the plate adjusting screws 23 are arranged at three positions at equal angular intervals as shown in FIG. Screw for plate adjustment 2
3 has its tip abutted on the plate body 22;
By tightening, the plate body 22 can be moved to the armature 32 side. One end of each plate adjusting screw 23 is formed with a hexagonal hole into which a hexagonal wrench is engaged.

The armature 32 is attached to the magnetic pole body 31 so as to be movable in the thrust direction while being guided by guide pins 32a implanted in the magnetic pole body 31. Magnetic body 31
Each of the armature 32 and the armature 32 has a shaft hole formed at the center thereof to allow the rotation shaft 2 to pass therethrough. The shaft hole formed in the magnetic pole body 31 is a stepped hole in which an inner flange 31b is formed on the left side in the drawing, and a braking hole for urging the armature 32 toward the plate body 22 in the stepped hole. A spring 33 is mounted.

An armature 32 is attached to the magnetic pole body 31 against the urging force of the spring 33 when energized.
An excitation coil 34 for attracting to the side is provided. The exciting coil 34 is housed in a recess of the magnetic pole body 31 which is released toward the armature 32 while being housed in a coil case 34a having a U-shaped cross section, and the recess is filled with a mold resin M to fix the exciting coil 34. are doing. Reference numeral 34b is a lead wire for supplying power to the exciting coil 34.

According to the above configuration, when the excitation coil 34 is not energized, the spring 33 presses the armature 32 against the plate body 22, and the friction plate 22a of the plate body 22 comes into contact with the armature 32 as shown in FIG. The rotation of the rotating shaft 2 is braked. When the excitation coil 34 is energized, the armature 32 is attracted to the magnetic pole body 31 against the urging force of the spring 33, and is separated from the plate body 22 to release the braking.

An appropriate gap is required between the friction plate 22a and the armature 32 during excitation so that the friction plate 22a and the armature 32 do not contact each other during excitation, and a predetermined frictional force acts during non-excitation. . The gap is defined by the positions of two hexagon nuts 8 screwed to the rotating shaft 2 at the time of initial setting. That is, at the time of initial setting, the hex nut 8 is adjusted, and the hub 21 is brought into contact with the hex nut 8, and a screw (not shown) is screwed into the screw hole 21 c and tightened. The position of the plate body 22 in the axial direction is fixed, and the gap width is determined. The inner nut of the two hexagon nuts 8 is for initial setting, and the outer nut is for preventing loosening.

When the friction plate 22a is worn out due to use and the gap width becomes inappropriate, three plate adjusting screws 2 are used.
The gap width can be readjusted by moving the plate body 22 in the thrust direction by uniformly tightening 3. It is not necessary to loosen the set screw used at the time of the initial setting or to retighten the hexagon nut 8, and both are fixed in the state of the initial setting.

Second Embodiment FIGS. 3 and 4 show a second embodiment.
3 shows a non-excited operation type electromagnetic brake 11 according to the embodiment of the present invention, and FIG.
FIG. 4A is an overall front view of FIG. 3 as viewed from the right side, and FIG. 4B is an enlarged cross-sectional view of a main part of FIG. Note that the second embodiment and the third embodiment described below have the same basic configuration as the non-excited operation type electromagnetic brake as the first embodiment, so the same members are the same. The description is omitted by attaching the reference numerals, and the description will focus on the difference between the hub and the plate.

Hub 24 of non-excited operation type electromagnetic brake 11
Is a cylindrical portion 2 surrounding the outer periphery of the rotating shaft 2 as shown in FIG.
4a and a flange portion 24b that protrudes toward the outer peripheral side at an intermediate portion in the thrust direction. A radial screw hole 24c for screwing a hub set screw (not shown) is formed at a portion on the right side of the flange portion 24b of the cylindrical portion 24a in the drawing, and a disc-shaped plate body is formed at a portion on the left side of the drawing in the drawing. 22 is spline-coupled so as to be movable in the thrust direction. The flange portion 24b of the second embodiment has a larger diameter than that of the first embodiment, and extends near the outer periphery of the plate body 22.

The plate body 22 is connected to the flange 24b via a leaf spring 25. Leaf spring 25
As shown in FIGS. 3 and 4 (B), the first member inserted at a predetermined position in the radial direction from the magnetic pole body 31 on the left side in the drawing through a through hole formed in the plate body 22. It is fixed to the hub 24 by the fixing bolt 26a, and the flange portion 24
b, and is fixed to the plate body 22 by second fixing bolts 26b inserted from the right side in the figure through through holes formed in the plate body 22. The leaf spring 25 is formed, for example, in an annular shape,
In a natural state where no external force is applied, the state returns to a flat state, that is, a state perpendicular to the rotation axis. As shown in FIG. 4A, three first fixing bolts 26a are provided at equal angular intervals, and each of the second fixing bolts 26b is also at an intermediate angle of the first fixing bolt 26a. Three are provided at equal angular intervals.

A plurality of screw holes 24d are formed in the flange portion 24b of the hub 24 along the thrust direction.
Plate adjusting screws 23 are screwed into these screw holes 24d, respectively. In this example, the screw hole 24d is shown in FIG.
As shown in FIG. 3A, three bolts are formed at equal angular intervals inside the first fixing bolt 26a. As shown in FIG. 4 (B), the tip of the plate adjusting screw 23 is in contact with the plate body 22, and the plate spring 22 is deformed by tightening to move the plate body 22 toward the armature 32. Can be moved.

The procedure for setting the gap is the same as that in the first embodiment. At the time of the initial setting, the hub 24 is applied to the two hex nuts 8 set at the predetermined positions, and the gap is set in the screw hole 24c. Screw in a hub set screw (not shown) and tighten. If the friction plate 22a wears due to use and the gap width becomes inappropriate, three plate adjusting screws 23 are used.
By uniformly tightening, the plate body 22 can be moved to the armature 32 side, and the gap width between the friction plate 22a of the plate body 22 and the armature 32 can be readjusted. Further, since the plate body 22 is always biased toward the flange portion 24b by the plate spring 25, if the plate adjusting screw 23 is excessively tightened and the gap becomes too narrow, the plate Adjustment screw 2
If 3 is loosened, the plate body 22 returns to the flange portion 24b side without being pushed by the armature 32, so that the fine adjustment of the gap can be performed properly. Further, the exciting coil 3
The plate body 22 can be prevented from inadvertently moving in the thrust direction and coming into contact with the armature during energization of the plate 4, that is, when braking is not performed.

Third Embodiment FIGS. 5 and 6 show a third embodiment.
5 shows a non-excited operation type electromagnetic brake 12 according to the embodiment, and FIG.
FIG. 6A is an overall front view of FIG. 5 as viewed from the right side, and FIG. 6B is an enlarged sectional view of a main part of FIG.

Hub 27 of non-excited operation type electromagnetic brake 12
Is a cylindrical portion 2 surrounding the outer circumference of the rotating shaft 2 as shown in FIG.
7a, and a flange portion 27b that protrudes toward the outer peripheral side at an intermediate portion in the thrust direction. A radial screw hole 27c for screwing a hub set screw (not shown) is formed in a portion of the cylindrical portion 27a on the right side of the flange portion 27b in the drawing, and a disk-shaped plate body is formed in a portion on the left side in the drawing. 22 is spline-coupled so as to be movable in the thrust direction. The flange portion 27b of the third embodiment extends to near the outer periphery of the plate main body 22, as in the second embodiment.

As shown in FIGS. 5 and 6B, the plate body 22 is formed with a stepped hole 22b having a step on the flange 27b side. The shaft of the rivet 28 that penetrates the flange portion 27b in the thrust direction from the right side in the drawing is inserted into the stepped hole 22b.
A push nut 29 is press-fitted into the shaft of the rivet 28 from the side of the magnetic pole body 31 on the left side in FIG.
The movement of the plate body 22 toward the magnetic body 31 is restricted by the push nut 29 inserted into the inside of the plate body b. As shown in FIG. 6A, the rivets 28 are
Book is provided.

A plurality of screw holes 27d are formed in the flange portion 27b of the hub 27 along the thrust direction.
A screw 23 for adjusting the plate is screwed into each of the screw holes 27d. In this example, the screw hole 27d is shown in FIG.
As shown in (A), three ridges 28 are formed inside the rivet 28 at equal angular intervals. As shown in FIG. 6 (B), the plate adjusting screw 23 has its tip abutted on the plate main body 22. By tightening, the push nut 29 slides toward the armature 32 while the plate adjusting screw 23 slides toward the armature 32 side. Can be moved to the armature 32 side.

The procedure for setting the gap is the same as that in the first embodiment. At the time of the initial setting, the hub 27 is applied to the two hex nuts 8 set at the predetermined positions, and the gap is set in the screw hole 27c. Screw in a hub set screw (not shown) and tighten. If the friction plate 22a wears due to use and the gap width becomes inappropriate, three plate adjusting screws 23 are used.
Can be readjusted to adjust the gap width again. The armature 3 of the plate body 22
Since the second side is pressed by the push nut 29, it is possible to prevent the plate main body 22 from accidentally moving in the thrust direction and coming into contact with the armature during energization of the exciting coil 34, that is, during non-braking.

Fourth Embodiment FIGS. 7 and 8 show a non-excited operation type electromagnetic brake 50 provided with a manual release device according to a fourth embodiment of the present invention. 8 is a front view of FIG. 7 as viewed from the right side. The fourth embodiment and the fifth embodiment described below are characterized by a manual release device 40A, and the basic configuration of the non-excited operation type electromagnetic brake 50 itself is shown in FIG.
The configuration is the same as any one of the first to third embodiments shown in FIG. Note that the manual release device of the present embodiment and the fifth embodiment described below can be applied not only to the first to fifth embodiments, but also to the conventional example shown in FIG. It is.

The non-excited operation type electromagnetic brake 50 includes a plate assembly 51 having a plate body movable in a thrust direction with respect to a hub 51 a fixed to the rotating shaft 2, and one surface of the plate assembly 51. , A magnetic pole body 53 fixedly provided, and an armature 54 slidable in the thrust direction. The non-excitation operation type electromagnetic brake 50 is disposed in a motor case 55 indicated by a two-dot chain line together with a motor (not shown) for driving the rotating shaft 2. Magnetic body 53 and armature 5
4 between the armature 54 and the plate assembly 51.
A spring (not shown) biasing the magnetic pole body 5
An excitation coil (not shown) for attracting the armature 54 to the magnetic pole body 53 against the urging force of the spring when the power is supplied is provided in the coil 3.

The armature 54 is in contact with the friction plate 52 of the plate assembly 51 by the biasing force of the spring when the excitation coil is not energized while the excitation coil is not energized.
The rotation of the rotating shaft 2 is braked. Numeral 8 denotes two hexagon nuts, an inner nut for initial setting and an outer nut for loosening prevention. The manual release device 40A is
Manual release unit 40 for manually releasing braking when not energized
Are exposed outside the motor case 55.

That is, as shown in FIGS. 7 and 8, the manual release section 40 is a pair of rotating shafts having an axis extending in the diameter direction of the magnetic pole body 53 and fixed to the magnetic pole body 53. A certain mounting bolt 41, a lever 42 that surrounds the outer circumference of the magnetic pole body 53 over substantially a half circumference and is rotatably mounted on the mounting bolt 41, and an operation fixed to an intermediate portion of the lever 42 in the outer circumferential direction. And a knob 43. As shown in FIG. 7, the motor case 55 has a long hole 55a long in the thrust direction, and only the operation knob 43 is exposed to the outside of the motor case 55 through the long hole 55a.

The lever 42 is connected to the armature 54 by a connecting bolt 44 at a position close to and on the same side as the intermediate portion with respect to the mounting bolt 41. The connecting bolt 44 slidably penetrates the lever 42 and is screwed to the armature 54. That is, the connection bolt 44 is not fixed to the lever 42 and can slide.

When the armature 54 moves away from the friction plate 52 of the plate assembly 51 toward the magnetic pole body 53 by energizing the excitation coil, the connecting bolt 44 is moved to the lever 42.
, And a gap is generated between the head of the connecting bolt 44 and the lever 42. When the energization of the exciting coil is cut off, the armature 54 separates from the magnetic pole body 53 and is urged by a braking spring (not shown).
And the head of the connecting bolt 44 and the lever 42
And adhere. Therefore, at this time, the lever 42 does not move.

When the operation knob 43 is slid in the direction of the arrow X shown in FIG.
Is rotated clockwise in FIG.
4 separates the armature 54 connected to the lever 42 from the friction plate 52 of the plate assembly 51 against the urging force of the spring.

According to the above configuration, since the operation knob 43 actually operated manually is exposed outside the motor case 55, the braking can be manually released without removing the motor case 55. The operation knob 43
When the armature 54 is released, the armature 54 returns to the position where it comes into contact with the friction plate 52 by the urging force of the spring, and braking is applied. If the manual release operation is not performed, the operation knob 43 may be fixed.

Fifth Embodiment FIGS. 9 and 10 show a non-excited operation type electromagnetic brake 50 provided with a manual release device according to a fifth embodiment of the present invention.
9 is a side view of the entire body in a normal state, and FIG. 10 is a front view of FIG. The configuration of the non-excited operation type electromagnetic brake 50 is the same as that in the above-described fourth embodiment.

Release manual operation unit 6 of manual release device 60A
Reference numeral 0 denotes a mounting bolt 61 which is a pair of rotating shafts having an axis extending in the diameter direction of the magnetic pole body 53 and fixed to the magnetic pole body 53.
And a lever 6 rotatably mounted on the mounting bolt 61 so as to surround the outer circumference of the magnetic pole body 53 substantially over a half circumference.
2 and a connecting rod 63 fixed to an intermediate portion of the lever 62 and extending in the thrust direction and protruding from the motor case 55.
And a wing nut 64 that is screwed into a screw formed at a portion of the connecting rod 63 protruding from the motor case 55.

The lever 62 is connected to the armature 54 by a connecting bolt 65 at a position close to and opposite to the intermediate portion with respect to the mounting bolt 61. The connection bolt 65 is slidably penetrated through the lever 62 and screwed to the armature 54. That is, the connection bolt 65 is not fixed to the lever 62 and can slide. Further, a compression spring 66 that urges the intermediate portion of the lever 62 in a direction away from the armature 54 is attached to the connecting rod 63. The compression spring 66 is interposed between the nut 67 fixed to the connecting rod 63 and the motor case 55, and applies a biasing force to the lever 62 in the clockwise direction in FIG.

When the armature 54 moves to the magnetic pole body 53 side by energizing the exciting coil, the connecting bolt 65 slides in the through hole of the lever 62, and the connecting bolt 65 moves between the head of the connecting bolt 65 and the lever 62. Gaps occur. When the energization to the excitation coil is cut off, the armature 54 separates from the magnetic pole body 53, and the head of the connecting bolt 65 and the lever 62 come into close contact with each other. The compression spring 66 has an effect of preventing backlash of the lever 62 when a gap occurs between the head of the connection bolt 65 and the lever 62.

When the wing nut 64 is tightened in a state where the power to the exciting coil is cut off, the connecting rod 63
Slides in the direction of arrow Y shown in FIG. 7 against the urging force of
The lever 62 rotates counterclockwise in FIG.
5 separates the armature 54 connected to the lever 62 from the friction plate 52 against the urging force of the spring.

According to the above configuration, since the wing nut 64 actually operated manually is exposed outside the motor case 55, the braking can be manually released without removing the motor case 55. The wing nut 64
Is loosened, the lever 62 and the armature 54 return to the position where they contact the friction plate 52 by the urging force of the compression spring 66 and the spring, and the braking is applied.

[0051]

The non-excited operation type electromagnetic brake of the present invention
With the above-described configuration, it has the following excellent effects. (1) By separating the hub and the plate body and adjusting the position of the plate body with respect to the hub as described in claim 1, the friction plate wears out and the gap with the armature is improper. In this case, the gap can be easily reset by adjusting the screw for adjusting the plate. Therefore, the life of the brake itself can be extended, and the running cost of a device using the brake can be reduced. (2) As described in claim 2, the hub and the plate body are spline-coupled to each other to reset the gap.
The plate body can be moved accurately. (3) As described in claims 3 and 4, when a leaf spring is used, even if the plate adjusting screw is excessively tightened and the gap becomes too narrow, if the plate adjusting screw is loosened, Since the plate body returns to the hub side without being pushed by the armature, fine adjustment can be performed again. Also,
It is possible to prevent the plate from accidentally moving in the thrust direction and coming into contact with the armature during energization of the exciting coil, that is, during non-braking. (4) When the plate is attached to the hub by a combination of a rivet and a push nut as described in claim 5, the plate is inadvertently moved in the thrust direction during energization of the exciting coil, that is, during non-braking. Contact with the armature. (5) When three plate adjusting screws are provided at equal angular intervals as described in claim 6, the plate can be moved in the thrust direction without bias with a minimum number of screws.

Since the manual release device of the present invention is configured as described above, it has the following excellent effects. (6) By exposing a part of the manual operation portion for release to the outside of the motor case as described in claim 7, the manual release from the outside of the motor case becomes possible without removing the motor case. Time can be saved. (7) As described in the eighth and ninth aspects, by combining the rotatable lever and the operation knob, it is possible to configure a manual release device that has a simple configuration and operates reliably. (8) As described in the tenth aspect, by using a rotatable lever and a connecting rod extending in the thrust direction and screwing a wing nut into a protruding portion of the connecting rod, from the same side as the rotating shaft. Operation becomes possible, and the released state can be maintained. (9) When a compression spring is attached to the connecting rod as described in claim 11, even when the armature is attracted to the magnetic pole body by energizing the exciting coil, the play of the lever or the connecting rod is prevented. Can be prevented.

[Brief description of the drawings]

FIG. 1 is an overall longitudinal side view of a non-excitation operation type electromagnetic brake according to a first embodiment of the present invention during braking.

FIG. 2 is a front view of the entire non-excited operation type electromagnetic brake of FIG. 1;

FIG. 3 is an overall longitudinal side view of a non-excitation operation type electromagnetic brake according to a second embodiment of the present invention during braking.

4A is a front view of the entire non-excited operation type electromagnetic brake of FIG. 3, and FIG. 4B is an enlarged sectional view of a main part of FIG. 3;

FIG. 5 is an overall vertical side view of a non-excitation operation type electromagnetic brake according to a third embodiment of the present invention during braking.

6A is a front view of the entire non-excited operation type electromagnetic brake of FIG. 5, and FIG. 6B is an enlarged sectional view of a main part of FIG.

FIG. 7 is an overall side view of a non-excitation operation type electromagnetic brake according to a fourth embodiment including the manual release device of the present invention.

8 is a front view of the entire non-excited operation type electromagnetic brake of FIG. 7;

FIG. 9 is an overall side view of a non-excited operation type electromagnetic brake according to a fifth embodiment including the manual release device of the present invention.

FIG. 10 is a front view of the entire non-excited operation type electromagnetic brake of FIG. 9;

FIG. 11 is an overall longitudinal side view showing an example of a conventional non-excitation operation type electromagnetic brake.

12 is a front view of the entire non-excited operation type electromagnetic brake of FIG. 11;

[Explanation of symbols]

 10, 11, 12: Non-excitation operated electromagnetic brake 2: Rotating shaft 8: Hex nut 20: Rotating part 21, 24, 27: Hub 22: Plate body 23: Plate adjusting screw 25: Leaf spring 28: Rivet 29: Push nut 30: fixed part 31: magnetic pole body 32: armature 33: spring 34: excitation coil 40, 60: manual operation part for release 41, 61: mounting bolt 42, 62: lever 43: operating knob 44, 65: connecting bolt 63: Connecting rod 64: Wing nut 66: Compression spring

Claims (11)

[Claims] 1. A magnetic pole body fixedly provided, an armature disposed to face the magnetic pole body and slidably mounted in the thrust direction on the magnetic pole body, and integrally rotating while holding a rotating shaft. A hub that rotates integrally with the hub, and a plate body slidably provided in the thrust direction with respect to the hub, and a friction plate fixed to the plate body at a position facing the armature. A plate assembly, a spring interposed between the magnetic pole body and the armature, and a spring for urging the armature toward the braking side of the plate body, provided in the magnetic pole body, and a biasing force of the spring when energized. An excitation coil that attracts the armature toward the magnetic pole body against the armature, and screwed into a plurality of screw holes formed in the hub along a thrust direction; By abutting the end to the plate body, non-excitation type electromagnetic brake, characterized in that it comprises a plurality of plate adjustment screw for adjusting the position of the thrust direction with respect to the armature of the plate body. 2. The non-excited electromagnetic brake according to claim 1, wherein the plate body is spline-coupled to the hub. 3. The non-excited electromagnetic brake according to claim 1, wherein the plate body is attached to the hub via a leaf spring. 4. The plate spring is fixed to the hub and the plate body at a predetermined position in a radial direction, and the plate adjusting screw is disposed in a radial direction from a fixed position of the plate spring to the hub and the plate body. The non-excited operation type electromagnetic brake according to claim 3, wherein the plate abuts on the inner side of the plate body. 5. The plate body is supported by a plurality of rivet shafts penetrating the hub in a thrust direction,
3. A non-excited operation type electromagnetic brake according to claim 1, wherein said shaft is fixed to said shaft by a push nut press-fitted from said magnetic pole body side. 6. The plate adjusting screw according to claim 1, wherein three plate adjusting screws are provided at equal angular intervals.
A non-excited operation type electromagnetic brake according to any one of the above. 7. A plate assembly that rotates with a rotating shaft, a magnetic pole body fixedly disposed on one side of the plate assembly, and a thrust direction disposed between the plate assembly and the magnetic pole body. An armature slidably attached to the magnetic pole body; a spring interposed between the magnetic pole body and the armature for urging the armature toward the plate assembly; An electromagnetic coil that attracts the armature toward the magnetic pole body against the urging force of the spring at the time.A non-excited electromagnetic brake is manually released.The non-excited electromagnetic brake drives the rotating shaft. And the armature is manually attached to the spring when the coil is de-energized. A manual release unit for moving to the magnetic pole body side against a force, wherein the manual release unit for release is partially exposed to the outside of the motor case and can be operated from outside the motor case. A manual release device for a non-excitation actuated electromagnetic brake. 8. The manual operation part for release has a pair of rotating shafts fixed to the magnetic pole body with the diametrical axis of the magnetic pole body, and encircling the outer periphery of the magnetic pole body for substantially half the circumference. Is mounted so as to be rotatable with respect to the rotary shaft, and
A lever connected to the armature at a position close to the rotation shaft, and an operation knob fixed to an intermediate portion of the lever toward an outer peripheral direction, and only the operation knob is exposed to the outside of the motor case. The manual release device for a non-excited operation type electromagnetic brake according to claim 7, wherein: 9. The manual release device according to claim 8, wherein the lever is connected to the armature on the same side as the intermediate portion with respect to the rotation axis. 10. The manual operation part for release has a pair of rotating shafts fixed to the magnetic pole body having an axial center in the diameter direction of the magnetic pole body, and encircling the outer periphery of the magnetic pole body for substantially half a circumference. A lever rotatably attached to the rotating shaft, and connected to the armature at a position close to the rotating shaft, and fixed to an intermediate portion of the lever and extending in the thrust direction. A connecting rod protruding from the motor case; and a wing nut screwed into a screw formed at a protruding portion of the connecting rod, wherein the lever is provided on a side opposite to the intermediate portion with respect to the rotation axis. The manual release device according to claim 7, wherein the manual release device is connected to the armature. 11. The manual release device according to claim 10, wherein a compression spring for urging the intermediate portion away from the armature is attached to the connecting rod.