JP2002372078A - Deenergizing actuated brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the release force of a manual releasing device and to miniaturize the device. SOLUTION: The manual releasing device is provided with a link plate 15 with one end pivotally fixed to a part used as a point of application of a release lever 13 and with the other end pivotally fixed to a part used as a point of force of a release plate 14, and a torsion coil spring 16 provided with spring force for spacing a pressing part 14a of the release plate 14 from a pressed part 22 of a release shaft 17. An armature 6 is spaced from a brake disk 8 by rotating the release lever 18 against the spring force of the torsion coil spring 16 and the spring force of a brake spring 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manual release device for a non-excited operation brake.

[0002]

2. Description of the Related Art Non-excitation operation brakes are disclosed in, for example,
As described in Japanese Patent Application Laid-Open No. 1-127554, an armature, a brake disk, and a pressure receiving plate are stacked on a magnetic pole surface side of a field core in which an excitation coil is housed, and a gap between the magnetic pole surface of the field core and the pressure receiving plate is provided. The pressure receiving plate is fixed to the field core by a plurality of interposed collars and a plurality of bolts individually inserted through the collars. In addition, the armature provided between the field core and the pressure receiving plate is supported on the field core movably only in the axial direction by engaging through holes and notched grooves formed on the outer peripheral surface with the collar. Have been. further,
The armature is urged toward the pressure receiving plate by the spring force of the braking spring, and the brake disc mounted on the braked shaft is braked between the armature and the pressure receiving plate. In addition, the armature is magnetically attracted to the field core against the spring force of the brake spring by the magnetic attraction force of the magnetic flux generated by energizing the excitation coil, thereby releasing the brake of the brake disk.

[0003] The manual release device for the non-excited operation brake is provided with a release plate having a pair of protrusions whose tips can contact the armature, and a release lever detachably fixed to the release plate. . The tip of a bolt protruding from the pressure receiving plate is inserted into the through hole of the release plate, and an elastic member and a washer are interposed between the release plate and the pressure receiving plate, and a nut is attached to the tip of the bolt. By screwing, the release plate is rotatably supported by the bolt. Further, a through hole for inserting the holding bolt is formed in the release lever, and the manual release state is maintained by screwing the holding bolt to the holding bracket.

[0004] Such a conventional non-excited operation brake,
When the excitation of the excitation coil is stopped after the motor is stopped, the motor is turned off. Be braked. Also, when the excitation coil is energized to be in the excited state, the armature is magnetically attracted to the field core against the spring force of the braking spring, so that the braking of the brake disk and the motor shaft on which the brake disk is mounted is released. You. Further, in the non-excitation state, the armature can be moved toward the field core against the spring force of the braking spring by rotating the release plate connected to the release lever.

[0005]

The conventional non-excited operation brake uses a manual release lever for moving the armature to the field core side against the spring force of the brake spring in a radial direction. Although it can be reduced by extending outward, the release lever cannot be extended sufficiently depending on the mounting location of the brake.
In addition, the bracket for holding the manual release lever is attached to the motor separately from the brake. An object of the present invention is to reduce the release force of the manual release device without extending the release lever in the radial direction, and to reduce the size of the manual release device. Another object of the present invention is to provide a non-excited operation brake which can be easily mounted on a machine to be braked such as a motor.

[0006]

In order to achieve the above object, a non-excitation operating brake according to a first aspect of the present invention provides a field core (1) in which an excitation coil (2) is housed in an annular groove (1a). ), An armature (6) provided to be able to contact and separate from the magnetic pole surface of the field core (1), a braking spring (11) for pressing the armature (6) against a brake disc (8), (1) a manual release device provided on the demagnetizing pole surface side, wherein the manual releasing device has one end fixed to the armature (6) and the other end outward from the demagnetizing pole surface of the field core (1). A protruding release shaft (17), a pressed portion (22) provided at the other end of the release shaft (17), and a pressing portion (14a) capable of coming in contact with and separating from the pressed portion (22) are provided. Pivotally attached to the field core (1) A release plate (14), a release lever (13) pivotally attached to the field core (1), and one end pivotally attached to a portion serving as an action point of the release lever (13); A link plate (15) having the other end pivotally connected to a portion serving as a force point, and a spring force for separating the pressing portion (14a) of the release plate (14) from the pressed portion (22) of the release shaft (17). Torsion coil spring (1)
6) is provided, and the armature (6) is rotated by rotating the release lever (13) against the spring force of the torsion coil spring (16) and the spring force of the braking spring (11). It is characterized in that it is separated from the brake disc (8).

A non-excited operation brake according to a second aspect of the present invention comprises
In the non-excited operation brake according to the invention, the release shaft (17)
The other end is provided with a pressed portion (22) whose position is adjustable.

A non-excited operation brake according to a third aspect of the present invention is the non-excited operation brake according to the first and second aspects, wherein the first plate capable of contacting the release plate (14) with the demagnetizing pole surface of the field core (1). The first stopper portion (20) abuts against the demagnetizing pole surface of the field core (1), thereby restricting the rotation of the release lever (13) in the anti-manual release direction. It is characterized by having done.

A non-excited operation brake according to a fourth aspect of the present invention is the non-excited operation brake according to the first, second or third aspect, wherein the release lever (1) is provided on the demagnetizing pole surface of the field core (1).
3) a second stopper portion (25) capable of abutting with the release lever (13) is provided on the second stopper portion (25).
The rotation of the release lever (13) in the manual release direction is limited by the contact of the release lever (13).

A non-excited operation brake according to a fifth aspect of the present invention provides a
In the non-excited operation brake according to the invention, the second stopper portion (25) is detachably provided on the demagnetizing pole surface of the field core (1), and the manual release device is released from the mounting position of the second stopper portion (25). The release state of the manual release device is maintained by rotating the lever (13) in the manual release direction.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A non-excited operation brake shown in FIGS. 1 to 7 will be described below as an embodiment of the present invention. FIG. 1 is a plan view of a non-excitation operation brake, and FIG.
FIG. 2 is a sectional view of the non-excitation operation brake of FIG. 1. FIG. 3 shows a support plate of the manual release device, (a) is a side view, and (b).
Is a plan view. 4A and 4B show a release lever of the manual release device, wherein FIG. 4A is a side view and FIG. 4B is a plan view. 5A and 5B are release plates of the manual release device. FIG. 5A is a side view and FIG. 5B is a plan view. FIG. 6 is a side view of the manual release device.
7A and 7B are explanatory views of the manual release device, in which FIG. 7A illustrates a state before manual release, FIG. 7B illustrates a manual release state, and FIG. 7C illustrates a state in which manual release is maintained.

The non-excitation operation brake is provided with a substantially cylindrical field core 1 in which an excitation coil 2 wound annularly is accommodated in an annular groove 1a opened in the axial direction. In the inner cylindrical portion of the field core 1, a plurality of bottomed holes 1b opened in the same direction as the annular groove 1a are formed at intervals in the circumferential direction. An annular flange portion 1c is formed so as to protrude.

The flange 1c of the field core 1
The through-hole 1d and the notch groove 1 are alternately arranged at intervals in the circumferential direction.
e is formed. One end of the connection bolt 3 is inserted into each through hole 1d of the flange portion 1c, and the connection bolt 3 is fixed to the flange portion 1c by a pair of nuts 4 screwed to the connection bolt 3. . Also,
The other end of each connection bolt 3 is screwed into a screw hole of a disc-shaped pressure receiving plate 5 that is disposed to face the magnetic pole surface of the field core 1 (the surface on the opening side of the annular groove 1a) at an interval in the axial direction. It is fixed. The flange 1 of the field core 1
The notch groove 1e formed in c is a relief groove when a not-shown mounting bolt is inserted from the through hole 5a of the pressure receiving plate 5 and screwed into a screw hole formed in a bracket of a machine to be braked such as a motor. is there.

Between the field core 1 and the pressure receiving plate 5,
A disk-shaped armature 6 is provided. On the outer peripheral surface side of the armature 6, the flange portion 1 of the field core 1 is provided.
c, a plurality of through-holes 6a axially facing the through-hole 1d, and a plurality of notch grooves 6b similarly axially facing the notch 1e formed in the flange 1c. I have. In each through hole 6a of the armature 6, a connection bolt 3 connecting the field core 1 and the pressure receiving plate 5, a nut fitted to the connection bolt 3 and a nut
And the collar 7 fixed between them is inserted. The armature 6 is guided by the collar 7 and supported by the field core 1 so as to be movable only in the axial direction.
In addition, the notch groove 6b is the notch groove 1 of the field core 1.
This is a relief groove provided for the same purpose as e.

At the center of the armature 6, a recess 6c protruding toward the field core 1 is formed by press working. In the center of the recess 6c, a screw hole 6d is provided.
Are formed, and the protruding side of the recess 6 c is fitted inside the inner peripheral surface of the field core 1. Further, one end of a release shaft 17 of a manual release device described later is screwed into the screw hole 6d of the armature 6.

Between the armature 6 and the pressure receiving plate 5, a brake disk 8 having brake linings fixed on both sides is interposed. Also, the brake disc 8
It is spline-fitted to a hub 10 key-fitted to a braked shaft 9 (for example, a motor shaft) of the machine to be braked.

In the non-excitation operation brake having such a configuration, in the non-excitation state in which the energization to the excitation coil 2 is cut off as shown in FIG. 2, the braking spring 11 inserted into the bottomed hole 1b of the field core 1 is used. Since the armature 6 is urged toward the pressure receiving plate 5 by the spring force, the brake disc 8 and the braked shaft 9 to which the brake disc 8 is mounted are braked and are kept stationary. In addition, the exciting coil 2
In the excited state, the armature 6 is magnetically attracted to the magnetic pole surface of the field core 1 against the spring force of the braking spring 11, so that the braking of the brake disk 8 by the armature 6 and the pressure receiving plate 5 is released, and The rotation of the brake shaft 9 becomes possible.

Next, the manual release device will be described. The manual release device includes a support plate 12 fixed to a demagnetizing pole surface of the field core 1 (an outer surface at the bottom of the annular groove 1a) with a screw, a release lever 13 pivotally attached to the support plate 12, and a support plate. 12
A release plate 14 pivotally connected to the release lever 13 and a link plate 15 having one end pivotally connected to a portion of the release lever 13 acting as an action point and the other end pivotally coupled to a portion of the release plate 14 acting as a force point. A double torsion type torsion coil spring 16 provided as an elastic member for automatically returning the release lever 13, the hooks at both ends are locked to the release plate 14, and the center hook 16 a is locked to the link plate 15; Is armature 6
And a release shaft 17 fixed to the armature 6 by screwing a nut 18 to the recess 6c side of the armature 6 and screwed into the screw hole 6d.

The support plate 12 includes a support portion 12a for a release lever 13 bent substantially in a U shape, a support portion 12b for a release plate 14 similarly bent in a substantially U shape, and a release shaft 17. The inserted through-hole 12c, the two through-holes 12d for inserting the mounting screws, and the through-hole 12e serving as a mounting position for a second stopper portion (bolt 25) described later, which is individually formed in the support portion 12b. Is provided. Also,
The release lever 13 is formed with a pair of side plates 13 a pivotally attached to the support portions 12 a of the support plate 12 with support pins 19. Note that the support plate 12 is formed such that the dimension between the support parts 12b is smaller than the dimension between the support parts 12a, and between the side plates 13a of the release lever 13 so that the inner surface of the side plate 13a covers the outer surface of the support part 12b. The dimensions have been set.

The release plate 14 is bent in a substantially U-shape, and an arc-shaped pressing portion 14a is formed on each of the opposed side plates. The bottom has a through hole 14 into which the release shaft 17 is inserted.
b and a through hole 14c for fixing a bolt 20 (first stopper portion) abutting on the bottom of the support plate 12 by rotating the release lever 13 to a position P (see FIG. 6) in a non-released state. Is formed. Release plate 1 having such a shape
Reference numeral 4 denotes a pair of nuts 22 (pressed portions), which are pivotally mounted by support pins 21 fixed between the support portions 12b of the support plate 12, and a pressing portion 14a is screwed to the other end of the release shaft 17, in the axial direction. Facing each other.

The link plate 15 is pivotally connected at one end to a support pin 23 fixed between the side plates 13a of the release lever 13 (the point of action of the release lever 13), and has the other end between the side plates of the release plate 14 (the release plate 14). At the point of force). The torsion coil spring 16 is fitted to the support pin 24. In the torsion coil spring 16, the hooks at both ends are locked to the release plate 14, the center hook 16 a extending outward is locked to the support shaft 23 side of the link plate 15, and the release lever 13 is released. A spring force urging toward the position P is applied.

Reference numeral 25 in FIG. 6 denotes a bolt (second stopper portion) with which the side plate 13a of the release lever 13 comes into contact when the release lever 13 is rotated to the release position Q. Is fixed to each side plate 12b. Reference numeral 26 in FIG. 2 denotes a nut that fixes the bolt 25 to the support plate 12. Also, reference numeral 2 shown in FIGS.
Reference numeral 7 denotes a nut member for attaching a casing (not shown) into which a cable connected to the release lever 13 is inserted.

The manual release device having such a configuration is
In FIG. 6, up to the position Q shown by the two-dot chain line (the bolt 2
5) until the side plate 13a abuts on the head of the release lever 14 in the manual release direction against the spring force of the torsion coil spring 16 and the spring force of the braking spring 11. 22 is the axial direction (field core 1)
Armature 6).
Can be moved to the field core 1 side. Therefore, in the non-excitation state of the brake, the braking of the brake disk 8 by the armature 6 and the pressure receiving plate 5 and the braking of the braked shaft 9 to which the brake disk 8 is mounted can be released.

When the release force for rotating the release lever 13 to the position Q disappears, the release lever 13 is released from the braking spring 1.
After being rotated in the anti-manual release direction by the spring force of 1,
Since the torsion coil spring 16 is rotated to the position P (until the head of the bolt 20 contacts the bottom of the support plate 12) by the spring force of the torsion coil spring 16 and the pressing force for pressing the nut 22 by the release plate 14 also disappears, The brake disk 8 is clamped between the armature 6 and the pressure receiving plate 5 by the spring force of the braking spring 11 and is braked.

Next, means for maintaining the release state of the manual release device will be described. The release plate 14 is a lever mechanism having a fulcrum pivotally attached to the support plate 12, an action point abutting on the nut 22, and a force point pivotally attached to the link plate 15 by the support pin 24. The release lever 13 is connected to a fulcrum pivotally attached to the support plate 12 by the support pin 19 and the support pin 2.
The lever mechanism 3 has a point of action to which the link plate 15 is pivotally attached by 3 and a force point to which a manual release cable (not shown) is connected. Further, by connecting the release plate 14 and the release lever 13 with the link plate 15, the release lever 13
Fulcrum A, action point B of release lever 13, release plate 1
This is a toggle mechanism having four force points C.

That is, with respect to the angle R of the angle ABC when the release lever 13 is at the position P as shown in FIG.
As shown in FIG. 7B, when the release lever 13 is at the position Q, the angle R of the angle ABC opens to about 180 degrees. In this state, when the release force for rotating the release lever 13 to the position Q side disappears, the spring force F of the braking spring 11 is acting on the release plate 14, so that the angle R of the angle ABC decreases, and further, The angle R of the angle ABC decreases due to the spring force of the torsion coil spring 16. Then, the release lever 13 automatically returns to the position P as shown in FIG.

Further, the bolt 25 provided as the second stopper portion is removed from the through hole 12e of the support plate 12, and the release lever 13 is further moved from the position Q to the through hole 12e (to the mounting position of the second stopper portion). 7), the angle R of the angle ABC opens to 180 degrees or more as shown in FIG. Then, a force acts on the release lever 13 in a direction in which the angle R of the angle ABC further increases due to the spring force F of the braking spring 11. Therefore, even if the release force for rotating the release lever 13 from the position P to the position Q disappears, the release lever 13 is maintained in the manual release state. The release lever 1
The release lever 13 can be automatically returned in the anti-manual release direction by applying a turning force to the position 3 to rotate from the position Q to the position P.

Although the embodiment of the present invention has been described above, in the non-excited operation brake according to the present invention, for example, the brake disk 8 is mounted on the shaft 9 to be braked so as to be stationary in the axial direction, and only the armature 6 is used. A non-excited operation brake having a structure for braking the motor may be used. Although the support plate 12 is provided in the manual release device, a structure in which a support portion is integrally formed on the demagnetizing pole surface of the field core 1 and the release plate 14 and the release lever 13 are pivotally attached to the support portion may be used. Further, the double torsion type torsion coil spring 16 has been described as the spring for automatically returning the release lever 13, but other torsion coil springs can be used. Also, the first
Although the bolts 20 and the bolts 25 are provided as the stopper portion and the second stopper portion, the stopper portions may be formed integrally with the release plate 14 and the support plate 12.

[0029]

According to a first aspect of the present invention, there is provided a non-excitation operating brake comprising a manual release device, a release shaft having one end fixed to the armature and the other end protruding outward from the demagnetizing pole surface of the field core;
A pressed portion provided at the other end of the release shaft, a release plate provided with a pressing portion capable of coming into contact with and separated from the pressed portion and pivotally attached to the field core, and a release lever pivotally attached to the field core. A link plate having one end pivotally connected to a portion serving as an action point of the release lever and the other end pivotally connected to a portion serving as a force point of the release plate, and a pressing portion of the release plate is separated from a pressed portion of the release shaft. A torsion coil spring to which a spring force is applied is provided, and the armature is separated from the brake disc by rotating the release lever against the spring force of the torsion coil spring and the spring force of the braking spring. The release force for rotating the release lever can be reduced without extending the release lever long in the radial direction, and the size of the manual release device can be reduced. Further, a means for maintaining the manual release state of the manual release device is simply provided, and a non-excited operation brake which can be easily mounted on the machine to be braked can be provided.

The non-excited operation brake according to the second invention has a first
In the non-excited operation brake according to the invention, the position of the pressed portion is adjustable at the other end of the release shaft, so that the position of the pressed portion with respect to the wear of the friction surface of the brake disk or the armature can be finely adjusted. .

A non-excited operation brake according to a third aspect of the present invention is the non-excited operation brake according to the first and second aspects, wherein the release plate is provided with a first stopper portion capable of contacting a demagnetizing pole surface of the field core. Since the first stopper portion abuts on the demagnetizing pole surface of the field core, the rotation of the release lever in the anti-manual release direction is limited, so that the first stopper portion is moved by the spring force of the torsion coil spring. It is kept in contact with the demagnetizing pole surface. Therefore, the vibration of the release lever due to the external vibration and the collision between the pressed portion of the release plate and the pressed portion are prevented.

A non-excited operation brake according to a fourth aspect of the present invention is the non-excited operation brake according to the first, second or third aspect of the invention, wherein the second stopper portion is capable of abutting the release lever on the demagnetizing pole surface of the field core. The release lever abuts on the second stopper portion, thereby restricting the rotation of the release lever in the manual release direction.Therefore, the release force for rotating the release lever to the manual release state disappears. The release lever can be automatically returned by the spring force of the braking spring and the spring force of the torsion coil spring.

The non-excitation operating brake according to the fifth aspect of the present invention provides
In the non-excited operation brake according to the invention, a second stopper portion is detachably provided on the demagnetizing pole surface of the field core,
Since the release state of the manual release device is maintained by rotating the release lever of the manual release device in the manual release direction from the mounting position of the stopper portion, the holding bracket for fixing the release lever is provided. There is no need to mount the brake on the machine to be braked, and the work of mounting the non-excited operation brake on the machine to be braked is simplified.

[Brief description of the drawings]

FIG. 1 is a plan view of a non-excited operation brake illustrated as an embodiment.

FIG. 2 is a cross-sectional view of the non-excitation operation brake of FIG.

3A and 3B are support plates of the manual release device, wherein FIG. 3A is a side view and FIG. 3B is a plan view.

FIG. 4 is a release lever of the manual release device, (a) is a side view, and (b) is a plan view.

FIG. 5 is a release plate of the manual release device, (a) is a side view, and (b) is a plan view.

FIG. 6 is a side view of the manual release device.

7A and 7B are explanatory views of the manual release device, in which FIG. 7A illustrates a state before manual release, FIG. 7B illustrates a manual release state, and FIG. 7C illustrates a state in which manual release is maintained.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Field core 6 Armature 8 Brake disk 11 Brake spring 13 Release lever 14 Release plate 15 Link plate 16 Torsion coil spring 17 Release shaft 20 Bolt (first stopper portion) 22 Nut (pressed portion) 25 Bolt (second stopper) Part)

Claims (5)

[Claims] A field core in which an exciting coil is housed in an annular groove; an armature provided to be able to contact and separate from a magnetic pole surface of the field core; a braking spring for pressing the armature against a brake disk; A manual release device provided on the demagnetizing pole side of the core, the manual releasing device comprising: a releasing shaft having one end fixed to the armature and the other end projecting outward from the demagnetizing pole surface of the field core; A pressed portion provided at the other end of the shaft, a release plate provided with a pressing portion capable of coming into contact with and separated from the pressed portion and pivotally attached to the field core; and a release lever pivotally attached to the field core. A link plate having one end pivotally connected to a portion serving as an action point of the release lever and the other end pivotally connected to a portion serving as a force point of the release plate; and a pressing portion of the release plate being pushed by the release shaft. A torsion coil spring provided with a spring force for separating the armature from the portion, and the armature is configured to rotate the release lever against the spring force of the torsion coil spring and the spring force of the braking spring. A non-excited operation brake characterized by being separated from a disk. 2. A non-excited operation brake according to claim 1, further comprising a pressed portion whose position can be adjusted at the other end of the release shaft. 3. The non-excited operation brake according to claim 1, wherein a first stopper portion is provided on the release plate, the first stopper portion being capable of contacting a demagnetizing pole surface of the field core, and the first stopper portion is provided with the first stopper portion. A non-excitation operation brake characterized in that rotation of the release lever in the anti-manual release direction is restricted by abutting against a demagnetizing pole surface of the field core. 4. The non-excited operation brake according to claim 1, wherein a second stopper portion is provided on the demagnetizing pole surface of the field core so as to be able to contact the release lever. A non-excited operation brake characterized in that rotation of the release lever in the manual release direction is restricted by contact of the release lever with the release lever. 5. The non-excited operation brake according to claim 4, wherein a second stopper portion is detachably provided on a demagnetizing pole surface of the field core, and the manual release device is released from a mounting position of the second stopper portion. A non-excited operation brake characterized in that the release state of the manual release device is maintained by rotating the lever in the manual release direction.