JP5555151B2 - Manual release device for non-excitation brake - Google Patents

Description

  The present invention relates to a manual release device for a non-excitation actuated brake that artificially releases braking of a non-excitation actuated brake.

  Conventionally, as an electromagnetic brake, there is a non-excitation actuating brake that enters a braking state when power is cut off. This type of non-excitation brake is used in various industrial equipment as a safety brake that brakes the rotation of a braked member during a power failure and maintains a stopped state. Conventional non-excitation brakes are provided with a manual release device so that braking can be released even when no power is supplied.

In this manual release device, the release lever is released manually by an operator or by remote operation via an operation wire to release braking of a non-excited brake disk. Some conventional manual release devices reduce the operating force when operating the release lever by the principle of “leverage”.
Conventional manual release devices include an automatic return type and a release holding type. The automatic return type manual release device is configured such that the release is released when the operating hand is released. The release-holding type manual release device is configured to maintain the release state even when the operating hand is released.

As a conventional non-excitation operation brake provided with an automatic return type manual release device, for example, there is one described in Patent Document 1 or Patent Document 2. On the other hand, as a conventional non-excitation brake including a release-holding type manual release device, for example, there is one described in Patent Document 3.
The non-excitation actuating brake disclosed in Patent Document 1 includes an armature and a side plate that sandwich a brake disk that rotates integrally with a rotating shaft of a motor from both sides. The brake disc is supported so as to rotate integrally with the rotating shaft so as to be movable in the axial direction.

  The armature is positioned between a field core provided at an end of the motor and the brake disc, and is supported by the field core so as to be movable in the axial direction. The field core is provided with an exciting coil for attracting the armature by magnetism. The armature is urged toward the brake disc by a braking spring provided on the field core. The side plate is positioned on the opposite side of the armature across the brake disc and is supported so as not to move to the field core.

  In the non-excitation brake, the armature is magnetically attracted to the field core against the spring force of the braking spring when the excitation coil is energized, and enters the non-braking state. In the non-excitation brake, when the energization to the excitation coil is cut off, the armature is pressed against the brake disk by the spring force of the braking spring, and the brake disk is pressed against the side plate by this pressing force.

  The manual release device provided in the non-excitation brake includes an eccentric pin that forcibly moves the armature pressed against the brake disc by the spring force of the braking spring toward the field core. The eccentric pin is rotatably supported by the field core so that the tip end portion is inserted between the armature and the side plate. The tip of the eccentric pin is formed so that the axial width of the motor changes as the eccentric pin rotates relative to the field core. By rotating the eccentric pin so as to widen the width, the armature is moved to the field core side by contact with the eccentric pin, and braking is released. A brake release lever is attached to the eccentric pin for operation by an operator.

  The non-excitation actuating brake disclosed in Patent Document 2 is for braking the rotation of an elevator hoist. This hoisting machine is equipped with two non-excitation brakes. These non-excitation brakes are each provided with a swinging release lever for manually releasing the braking. The swinging end portions of these release levers are connected to each other by a displacement member.

  The manual release device for the non-excitation actuating brake shown in Patent Document 2 employs a configuration in which an operator moves the displacement member by remote control. This manual release device is composed of a swing lever that is swingably supported by a frame on the hoisting machine side via a support shaft, and an operation wire connected to the swing end of the swing lever. Yes. The operation wire connects the operation lever located on the top floor and the swing lever.

  The swing lever is configured to push the displacement member toward the brake release side by being pulled by the operation wire and swinging. The displacement member is positioned so as to face a portion close to the swing center of the swing lever. That is, the swing lever is configured so that the displacement member (release lever) can be operated by the so-called lever principle. For this reason, the non-excitation actuating brake shown in Patent Document 2 can perform an operation of releasing the braking by a remote operation with a small operating force.

  The non-excited operation brake disclosed in Patent Document 3 includes a manual release device that maintains a released state without any operation after the brake is manually released. This manual release device is configured to push the armature to the field core side with a bolt. The bolt is attached to a side plate that cooperates with the armature and brakes with a brake disk interposed therebetween.

JP 2009-108928 A JP 2009-57188 A Japanese Utility Model Publication No. 53-101180

  In the automatic return type manual release device as disclosed in Patent Literature 1 and Patent Literature 2, it is preferable that the operation force when releasing the braking is as small as possible. However, in order to realize this, it is necessary to make the lever operated by the operator long, or when using the `` lever '', it is necessary to increase the distance between the force point and the action point, and the manual release device becomes large. End up.

  On the other hand, when the manual release device is used, it is when the rotating shaft is rotated in a state where the exciting coil cannot be energized for some reason, or during maintenance or inspection. That is, the frequency of using the manual release device is low. There may also be no need to remotely operate the manual release device. Furthermore, if a manual release device is installed in a non-excited brake, the number of parts and the number of assembly steps will increase, making it difficult to reduce the price of braked equipment with brakes.

For this reason, the conventional manual release device for non-excited brakes reduces the number of parts that are always equipped to the non-excited brakes as much as possible, and installs other parts such as levers that the operator grips as necessary. It is requested to be able to do it.
There is also a demand for a manual release device with a simple structure that combines the function of an automatic return type manual release device and the function of a release-holding type manual release device.

  The present invention has been made to solve such a problem, and it is a first object of the present invention to provide a manual release device that can release braking with a small operating force and can reduce the number of components provided in a non-excitation brake. Objective. It is a second object of the present invention to provide a manual release device having a simple structure that has both the function of an automatic return type manual release device and the function of a release-holding type manual release device.

  In order to achieve this object, the manual release device for a non-excitation actuating brake according to the present invention releases the brake by moving the armature to the field core side against the spring force of the braking spring of the non-excitation actuating brake. A brake release operation element, an installation part provided on an outer surface of a portion that does not move relative to the field core, and a rotation operation device that is detachably attached to the operation element and the installation part The rotating operation device is provided with an engaging portion that is detachably and rotatably engageable with the operating element at one end, and the engaging portion is engaged with the operating element. A first link extending in a direction opposite to the operation direction of the brake release operation element, and a shaft portion that is supported by the installation portion in a swingable manner and in a state in which movement in the direction along the outer surface is restricted. Is provided at one end And a toggle mechanism having the other end of the first link rotatably connected to the other end, and the second link is installed in the toggle mechanism. The first link is configured to push the operation element with a force larger than the operation force by being swung with a predetermined operation force around the portion.

According to the present invention, in the above invention, the second link includes an operation lever that extends to a side opposite to the shaft portion from a connecting portion with the first link.
According to the present invention, in the invention described above, the connection portion between the first link and the second link of the rotation operation device is a virtual connection between a portion of the operation element to which the first link is connected and the installation portion. Is configured to be movable from the line to the non-excitation actuating brake side, and further movement is restricted by contact with the regulating part on the non-exciting actuating brake side when moving from the virtual line to the non-excitation actuating brake side It is.
According to the present invention, in the above-described invention, the brake release operation element constitutes a lever having a connection portion with the first link as a power point and a connection portion with the armature side member as an action point.

According to the present invention, the non-excitation actuating brake can be used in a state in which the turning operation device operated by the operator is not mounted. That is, this non-excitation brake can be provided at a low cost because the manufacturing cost is reduced by the amount that the rotation operation device is not incorporated.
In order to release the brake manually when the non-excitation brake is in a braking state, a rotation operation device is mounted on the brake release operation element and the installation portion, and the operation is performed using the rotation operation device. Do this by pressing the child.

The rotation operation device is configured by a toggle mechanism that increases the force (output) for pushing the operating element by the first link with respect to the operation force (input) applied to the second link. Can be reduced. Further, the toggle mechanism can be arranged along the non-excitation brake, and the manual release device can be formed relatively compact compared to the case where the lever-type lever reduces the operating force. Can do.
For this reason, according to the present invention, it is possible to provide a manual release device that is small in size and that can release the brake with a small operating force and that requires a small number of parts to be provided in the non-excitation brake.

It is a front view of the non-excitation operation brake used as the object of the manual release device concerning the present invention. It is sectional drawing of a non-excitation actuating brake, The figure is the II-II sectional view taken on the line in FIG. It is a perspective view of a rotation operation device. It is a side view of the non-excitation operating brake for demonstrating the procedure which mounts a rotation operating device to a non-excitation operating brake. In the same figure, only a part of the non-excitation actuating brake is depicted, and the part through which the release bolt penetrates and the first and second covers are depicted in a broken state. It is a side view of the non-excitation operation brake with which the rotation operation device was equipped. In the same figure, only a part of the non-excitation actuating brake is depicted, and the part through which the release bolt penetrates and the first and second covers are depicted in a broken state. It is a side view of the non-excitation operation brake which shows the state of the last stage of the stroke which releases braking. In the same figure, only a part of the non-excitation actuating brake is depicted, and the part through which the release bolt penetrates and the first and second covers are depicted in a broken state. It is a side view of the non-excitation operation brake which shows the state which the connection part of a 1st link and a 2nd link is contact | abutting to the control part. In the same figure, only a part of the non-excitation actuating brake is depicted, and the part through which the release bolt penetrates and the first and second covers are depicted in a broken state. It is a schematic diagram for demonstrating the structure of a rotation operation apparatus.

Hereinafter, an embodiment of a manual release device for a non-excitation brake according to the present invention will be described in detail with reference to FIGS.
A non-excitation brake 1 shown in FIGS. 1 and 2 is attached to a rear housing 3 of a motor 2 (see FIG. 2) as a braked device via a mounting plate 4. The motor 2 is for driving a rotating shaft 5 extending in the left-right direction in FIG. The rotating shaft 5 is formed so as to protrude from the rear housing 3 to the rear of the motor 2 (leftward in FIG. 2).

  As shown in FIG. 2, the non-excitation operating brake 1 includes a first braking unit 6 and a second braking unit 7 that are arranged in the axial direction of the rotating shaft 5. These braking units 6 and 7 are configured to brake the rotation of the brake discs (first brake disc 8 and second brake disc 9), respectively. The first and second brake discs 8 and 9 are supported by the rotary shaft 5 so as to rotate integrally with the rotary shaft 5 and move in the axial direction with respect to the rotary shaft 5.

  Of the first and second braking parts 6, 7, the first braking part 6 at a position close to the motor 2 includes a first side plate 11 comprising a mounting plate 4 attached to the rear housing 3, and A first armature 12 that sandwiches the first brake disk 8 in cooperation with the first side plate 11 and a first field core 13 on which the first armature 12 is magnetically attracted are provided. . The attachment plate 4 is attached to the rear housing 3 by bolts 14 (see FIG. 1). The mounting plate 4 is formed smaller than the rear housing 3 so that a corner 15 (see FIG. 2) is formed at a connection portion with the rear housing 3. In this embodiment, the corner 15 constitutes an installation portion 17 for installing one end portion of a rotation operation device 16 (see FIG. 3) described later.

The second braking portion 7 includes a second side plate 21 constituted by a rear end portion (left end portion in FIG. 2) of the first field core 13, and the second side plate 21. A second armature 22 is provided which sandwiches the second brake disk 9 and a second field core 23 on which the second armature 22 is magnetically attracted.
Each of the first and second field cores 13 and 23 is formed in an annular shape, and includes an annular exciting coil 24.

  The exciting coil 24 generates a magnetic flux so that first and second armatures 12 and 22 (to be described later) are magnetically attracted to the first and second field cores 13 and 23. The first and second field coils It is accommodated in an annular groove 25 formed in the cores 13 and 23. The exciting coil 24 is fixed to the first and second field cores 13 and 23 by an insulating resin (not shown) filled in the annular groove 25. The annular groove 25 has first and second outer poles 13a and 23a formed on the outer peripheral side of the first and second field cores 13 and 23, and inner poles 13b and 23b formed on the inner peripheral side. Opening toward the second armature 12, 22.

  The first and second field cores 13 and 23 are attached to the mounting plate 4 by mounting bolts 26 penetrating the outer peripheries of these members. As shown in FIG. 1, the mounting bolt 26 is provided at a position that divides the outer peripheral portions of the first and second field cores 13 and 23 into six equal parts in the circumferential direction. As shown in FIG. 2, these mounting bolts 26 are respectively inserted into through holes 27 formed in the outer peripheral portions of the first and second field cores 13 and 23. An opening portion on the motor 2 side in the through hole 27 is formed as a screw hole 27a. A cylindrical member 28 for gap adjustment is screwed into the screw hole 27a.

  The cylindrical member 28 is formed so as to protrude from the first and second field cores 13 and 23 toward the motor 2 by a predetermined length. The tip of the cylindrical member 28 attached to the first field core 13 is in contact with the attachment plate 4 (first side plate 11). The cylindrical member 28 attached to the second field core 23 is in contact with the first field core 13 (second side plate 21). That is, the first and second field cores 13 and 23 are attached to the attachment plate 4 by the attachment bolts 26 while being positioned in the axial direction by the cylindrical member 28. As described above, the first and second field cores 13 and 23 are positioned in the axial direction, whereby the first and second field cores 13 and 23 and the first and second side plates 11 and 21 are connected. A space having a predetermined width is formed between the first and second armatures 12 and 22 and the first and second brake discs 8 and 9, which will be described later.

  Portions of the cylindrical member 28 that protrude from the first and second field cores 13 and 23 toward the motor 2 pass through the first and second armatures 12 and 22. The first and second armatures 12 and 22 are formed in an annular plate shape from a magnetic material. The cylindrical member 28 is inserted through a through hole 29 formed in the outer peripheral portion of the armatures 12 and 22. The first and second armatures 12 and 22 are supported by the cylindrical member 28 so as to be movable in the axial direction (left and right direction in FIG. 2).

  Inner peripheral portions of the first and second armatures 12 and 22, and the first and second side plates 11 that sandwich the first and second brake disks 8 and 9 in cooperation with the armatures 12 and 22. Friction surfaces 30 that come into contact with the first and second brake disks 8 and 9 are formed on the inner peripheral portion 21. The friction surface 30 is formed by annular convex portions that protrude with respect to the outer peripheral portions of the first and second armatures 12 and 22 and the first and second side plates 11 and 21.

  The outer sides in the radial direction of the first and second armatures 12 and 22 and the first and second brake discs 8 and 9 are covered with cylindrical first and second covers 31 and 32. These covers 31 and 32 are intended to prevent wear powder from scattering around the non-excitation brake 1. The first cover 31 is attached to the first side plate 11 and the first field core 13. The second cover 32 is attached to the second side plate 21 and the second field core 23. In the non-excited operation brake 1 according to this embodiment, a cover 33 is attached to the rear end portion of the second field core 23 in order to prevent the abrasion powder from scattering. The cover 33 is formed in a disc shape and closes the opening portion on the inner peripheral side of the second field core 23.

  In order to press the first and second armatures 12 and 22 toward the first and second side plates 11 and 21 on the outer and inner peripheral portions of the first and second field cores 13 and 23, respectively. A plurality of braking springs 34 are provided. The braking spring 34 according to this embodiment is formed by a compression coil spring. These braking springs 34 are inserted and held in spring holes 35 that open to the outer poles 13a and 23a of the first and second field cores 13 and 23 and spring holes 36 that open to the inner poles 13b and 23b. The first and second field cores 13 and 23 and the first and second armatures 12 and 22 are compressed by being sandwiched between them.

The spring holes 35 and 36 are formed at positions that divide the first and second field cores 13 and 23 into three equal parts in the circumferential direction, respectively.
The first and second armatures 12 and 22 pressed by the plurality of braking springs 34 are supported by the cylindrical member 28 when the exciting coil 24 is in a non-excited state, and the first and second brake discs are supported. 8 and 9 and press these brake discs 8 and 9 against the first and second side plates 11 and 21, respectively. As a result, the first and second brake discs 8 and 9 are sandwiched between the first and second armatures 12 and 22 and the first and second side plates 11 and 21, and the rotating shaft 5 of the motor 2 is braked. Is done.

In the non-excited operation brake 1 according to this embodiment, the first and second armatures 12 and 22 are first and second released by two release bolts 41 and 41 in order to manually release the above-described braking. A manual release device 42 is provided for moving the brake disk 8 or 9 to the opposite side.
The two release bolts 41 and 41 are for connecting a release lever 43 constituting a part of the manual release device 42 to the first and second armatures 12 and 22. In this embodiment, the release bolt 41 constitutes an “armature-side member” according to the fourth aspect of the present invention.

The release bolt 41 includes a stepped through hole 44 formed in a leg 43a of a release lever 43, which will be described later, and a through hole 45 formed in the outer periphery of the first and second field cores 13 and 23. The through-hole 46 with the step formed in the outer peripheral part of the 1st, 2nd armature 12 and 22 is penetrated.
The stepped through hole 44 of the release lever 43 has a larger diameter than the groove 44a (see FIG. 1) in which the head 41a of the release bolt 41 is fitted and the threaded portion 41b of the release bolt 41. The small-diameter portion 44b is formed, and the large-diameter portion 44c is formed so that the hole diameter is larger than that of the small-diameter portion 44b. As shown in FIG. 7, the large diameter portion 44 c is a so-called escape hole for avoiding interference between the leg portion 43 a and the release bolt 41 when the release lever 43 is swung with respect to the second field core 23. And is opened at the end face of the leg portion 43a facing the second field core 23.

  By forming the stepped through hole 44 in the release lever 43 in this way, the release lever 43 can be inclined with respect to the release bolt 41. That is, the release lever 43 is counterclockwise in FIG. 2 centering on the release bolt 41 from the initial position shown in FIG. 2 until the opening portion of the small diameter portion 44b contacts the release bolt 41 (see FIG. 7). Can be swung.

  When the release lever 43 swings in this way, as shown in FIG. 7, the contact point A between the tip edge of the release lever 43 facing the second field core 23 and the second field core 23 swings. Become the center. Further, at the time of the swing, the release lever 43 that contacts the head 41 a of the release bolt 41 at the contact point B pushes the head 41 a in the direction away from the second field core 23. That is, the release lever 43 is configured so that the release bolt 41 can be moved on the principle of leverage.

  This lever is configured with the swing end portion (upper end portion in FIG. 7) of the release lever 43 as a force point, the contact point A as a fulcrum, and the contact point B as an action point. The force applied to the oscillating end of the release lever 43 includes a distance D1 (see FIG. 7) between the fulcrum (contact point A) and the force point, a fulcrum (contact point A), and an action point (contact point B). Increases in accordance with the ratio (lever ratio) to the distance D2, and is transmitted to the release bolt 41. The swinging direction when the release lever 43 is configured as described above is indicated by an arrow R in FIGS. Hereinafter, the direction indicated by the arrow R is referred to as an operation direction of the release lever 43.

  The stepped through holes 46 of the first and second armatures 12 and 22 have small diameter portions 46a that open to end surfaces of the armatures 12 and 22 facing the first and second field cores 13 and 23, respectively. These armatures 12 and 22 are constituted by the first and second side plates 11 and 21 and a large-diameter portion 46b that opens to the end faces facing the armatures 12 and 22. A compression coil spring 47 is inserted into the small diameter portion 46a.

  In the large diameter portion 46b, a part of a nut 48 screwed into the release bolt 41 is inserted. The compression coil spring 47 is penetrated by the release bolt 41 and is compressed by being sandwiched between the nut 48 and the magnetic pole surfaces of the outer poles 13a and 23a of the first and second field cores 13 and 23. . That is, the compression coil spring 47 urges the nut 48 to the opposite side to the first and second field cores 13 and 23, and the first and second armatures 12 and 22 are first and second. The release bolt 41 and the release lever 43 function as an anti-vibration damper that prevents the release bolt 41 and the release lever 43 from vibrating unnecessarily during normal magnetic adsorption to the two field cores 13 and 23.

As shown in FIG. 1, the release lever 43 is formed by a leg portion 43a formed in an arc shape that opens downward in the figure, and a trunk portion 43b protruding from the center portion of the leg portion 43a. It is configured. In this embodiment, the release lever 43 constitutes a brake release operation element according to the present invention.
As shown in FIG. 1, the leg portion 43 a is sized so as to overlap with the outer peripheral portion of the second field core 23 when viewed from the axial direction of the non-excitation brake 1. The stepped through holes 44 described above are formed at both ends of the leg 43a, and the release bolt 41 is connected as described above. Both end portions of the leg portion 43 a are formed in a shape that is in close contact with the second field core 23 by the spring force of the braking spring 34 and the spring force of the vibration-proof compression coil spring 47.

  The trunk portion 43b is formed so as to protrude on the opposite side to the leg portion 43a, and a U-shaped groove 49 is formed in the front view shown in FIG. The trunk portion 43 b is provided with a locking member 52 including a bolt 50 that extends across the groove 49 and a nut 51 that is screwed to the bolt 50. The locking member 52 is fixed to the body portion 43 b by tightening a nut 51 to the bolt 50. The locking member 52 is normally not connected to anything.

  As shown in FIGS. 4 and 5, the manual release device 42 includes the two release bolts 41 and the release lever 43, and the rotation operation device 16 having one end connected to the release lever 43, It is comprised by the said installation part 17 by the side of the non-excitation actuating brake 1 which supports the other end part of this rotation operating device 16. The installation portion 17 is not limited to the corner 15 portion as long as it is an outer surface of a portion that does not move with respect to the first and second field cores 13 and 23.

  The rotation operation device 16 is formed so as to be detachable from the non-excitation operating brake 1 and is attached to the non-excitation operating brake 1 only when the non-excitation operating brake 1 is manually released. is there. As shown in FIGS. 3 to 7, the rotating operation device 16 includes a first link 61 whose one end is engaged with the release lever 43, and a connecting bolt at the other end of the first link 61. A toggle mechanism 64 having a second link 63 that is rotatably connected by 62.

  As shown in FIG. 3, the first link 61 includes an engagement member 65 that engages with the release lever 43, a coupling member 66 that is coupled to the second link 63, and a coupling with these engagement members 65. It is comprised by the adjustment member 67 which connects the member 66. FIG. An engaging groove 65a is formed at one end of the engaging member 65 so as to be detachably and rotatably engageable with a locking member 52 (see FIG. 1) of the release lever 43. In this embodiment, the “engagement portion” referred to in the present invention is constituted by the engagement groove 65a. A first threaded portion 67 a of an adjusting member 67 described later is screwed into the other end portion of the engaging member 65.

A connecting bolt 62 for connecting the second link 63 passes through one end of the coupling member 66. A second screw portion 67 b of the adjustment member 67 is screwed into the other end portion of the coupling member 66.
The adjustment member 67 includes an adjustment bolt 67d in which the first screw portion 67a and the second screw portion 67b extend from the head 67c on both sides, and lock nuts screwed into the screw portions 67a and 67b, respectively. 67e. One of the first screw part 67a and the second screw part 67b is a right-hand thread, and the other is a left-hand thread. For this reason, the interval between the engaging member 65 and the coupling member 66 can be adjusted by rotating the adjusting bolt 67d.

The second link 63 includes a support member 71 rotatably connected to the coupling member 66 by a connection bolt 62 and an operation lever 72 provided on the support member 71.
One end of the support member 71 is provided with a shaft portion 71 a that is supported by the installation portion 17 when the rotation operation device 16 is attached to the non-excitation operation brake 1. As shown in FIG. 3, the tip portion of the shaft portion 71 a is formed in a semicircular cross section extending in the axial direction of the connecting bolt 62. As shown in FIG. 5, the shaft portion 71 a comes into contact with the rear housing 3 in a state where it is supported by the installation portion 17.

  For this reason, the shaft portion 71a is supported by the installation portion 17 in a state where movement in the direction along the outer surface of the non-excitation brake 1 (movement toward the motor 2) is restricted. Moreover, since the installation part 17 functions as a bearing substantially, the axial part 71a is supported by the installation part 17 so that rocking | fluctuation is possible. As shown in FIG. 5, the shaft 71 a (second link 63) swings in the direction in which the other end of the support member 71 approaches the non-excitation brake 1 as viewed from the axial direction of the connecting bolt 62. It is a direction to separate.

  As shown in FIG. 3, a pair of arm portions 71 b and 71 c sandwiching the coupling member 66 are formed at the other end of the support member 71. A collar (not shown) penetrating the coupling member 66 is sandwiched between the arm portions 71b and 71c. The connecting bolt 62 passes through the pair of arm portions 71b and 71c and the collar. The connecting bolt 62 is fixed to the support member 71 by tightening a nut 73 at the tip.

The operation lever 72 is used by an operator (not shown) to be held and operated by a hand, and is formed in a round bar shape. The operation lever 72 according to this embodiment is fixed in a state of being fitted into a bottomed circular hole 74 formed in the support member 71. 3 is drawn in a state of being broken in the vicinity of the support member 71.
The operation lever 72 is formed so as to extend from the connecting portion (the connecting bolt 62) between the support member 71 and the first link 61 to the opposite side to the shaft portion 71a.

  That is, the distance D3 (see FIG. 5) between the tip of the operation lever 72 and the swing center C (see FIG. 5) of the second link 63 is greater than the distance D4 between the connecting bolt 62 and the swing center C. It is formed long. For this reason, the second link 63 uses the tip of the operation lever 72 as a force point, uses the contact portion (the swing center C) between the shaft portion 71a and the installation portion 17 as a fulcrum, and uses the connecting bolt 62 as an action point. It constitutes a lever. For this reason, the operating force F0 (see FIG. 5) applied to the tip of the operating lever 72 depends on the ratio (lever ratio) between the distance D3 between the fulcrum and the force point and the distance D4 between the fulcrum and the action point. It increases and is transmitted to the first link 61 as the operating force F1 (see FIG. 5).

  As shown in FIG. 5, the lengths of the first and second links 61 and 63 are such that the first link 61 has the release lever in a state in which the rotation operation device 16 is mounted on the non-excitation brake 1. It is formed so as to extend in a direction opposite to the operation direction of 43. The state in which the rotation operation device 16 is mounted on the non-excitation brake 1 means that the shaft portion 71a of the second link 63 is supported by the installation portion 17 and the engaging member 65 of the first link 61 is released. This is a state where the operating force is not applied to the operating lever 72 of the second link 63 by engaging with the locking member 52 of the lever 43. In this mounted state, as shown in FIG. 5, the connecting bolt 62 for connecting the first link 61 and the second link 63 is connected to the locking member 52 (the first link 61 in the release lever 43 is connected). Is located on the opposite side of the non-excitation actuating brake 1 from a virtual line L connecting the shaft portion 71a and the tip end portion (the installation portion 17).

  In the toggle mechanism 64 composed of the first link 61 and the second link 63, the force P that the first link 61 pushes the release lever 43 when the operating force F1 is applied from the operating lever 72 (see FIG. 5). ) Can be expressed by the following equation when considered in the model diagram shown in FIG. In FIG. 8, the node A indicates the tip portion of the shaft portion 71 a, the node B indicates the connecting bolt 62, and the node C indicates the locking member 52. In FIG. 8, the case where the 1st link 61 and the 2nd link 63 become the same length is shown.

In the toggle mechanism 64 shown in FIG. 8, when the operating force F1 is applied to the node B, the force P that the first link 61 pushes the node C is:
P = F1 / 2 tan θ. When the angle θ is 27 °, F1 = 1.018 × P. Further, when the angle θ = 26 °, F1 = 0.975 × P, when θ = 12 °, F1 = 0.425 × P, and when θ = 5 °, F1 = 0.175 × P. That is, by setting the angle θ so that the angle θ is 26 ° or less, a large pressing force P can be obtained with a relatively small operating force F1.

  In the toggle mechanism 64 according to the present embodiment shown in FIG. 5, the angle θ1 formed by the first link 61 and the virtual line L is formed to be smaller than 26 °, and the angle θ2 formed by the second link 63 and the virtual line L. Is formed at about 26 °. For this reason, according to the toggle mechanism 64, the second link 63 is swung with a predetermined operating force around the installation portion 17, so that the first link 61 has a force P greater than the operating force F1. Thus, the release lever 43 is pushed.

  When the release lever 43 is pushed by the toggle mechanism 64 (the rotation operation device 16), the release lever 43 swings in the operation direction indicated by the arrow R in FIG. As the release lever 43 swings in this manner, the release bolt 41 moves and the first and second armatures 12 and 22 resist the spring force of the braking spring 34 in the first and second fields. It moves to the cores 13 and 23 side. As a result, braking on the non-excitation operation brake 1 side is released.

  In this toggle mechanism 64, the second link 63 is swung from the mounted state shown in FIG. 5 to connect the first link 61 and the second link 63 (connection portion) as shown in FIG. The bolt 62) approaches the virtual line L. Then, by further swinging the second link 63, as shown in FIG. 7, the connecting portion (the connecting bolt 62) moves from the virtual line L to the non-excitation actuating brake 1 side.

  The movement of the connecting portion toward the non-excitation operating brake 1 is restricted by the support member 71 and the coupling member 66 coming into contact with the first and second covers 31 and 32 of the non-excitation operating brake 1. When the first and second covers 31 and 32 are not provided, the connecting portion between the first link 61 and the second link 63 is connected to the first field core 13 or the non-excitation brake 1. It abuts on other parts. In this embodiment, the first and second covers 31 and 32 constitute a “regulator” according to the third aspect of the present invention.

  In the state in which the connecting portion does not exceed the imaginary line L, the rotation operating device 16 causes the spring force of the braking spring 34 to be released from the first and second armatures 12 and 22 to the release bolt 41 and the release lever 43. Therefore, when the operation lever 72 is released, the position returns to the initial position. However, in a state where the connecting portion exceeds the imaginary line L, when the operating lever 72 is released, the first link 61 and the second link 63 are moved by the spring force of the braking spring 34 to the first and second links 63. Since it is pressed against the covers 31 and 32 and cannot move any more, the state (the state in which braking is released) is maintained.

Next, the operation of the non-excited brake manual release device 42 according to the present invention will be described.
The non-excitation brake 1 described above is normally used in a state where the rotation operation device 16 is not mounted. In the non-excitation brake 1, in a normal state where the motor 2 rotates, the excitation coil 24 is energized and the first and second armatures 12 and 22 are magnetically attracted to the first and second field cores 13 and 23. Is done. In this state, the first and second brake disks 8 and 9 rotate integrally with the rotating shaft 5 of the motor 2.

  On the other hand, when the rotation of the motor 2 is stopped and the energization of the exciting coil 24 is cut off to be in a non-excited state, the first and second armatures 12 and 22 are moved into the first and second armatures by the spring force of the braking spring 34. The brake discs 8 and 9 are pressed against each other, and the brake discs 8 and 9 are further pressed against the first and second side plates 11 and 21. As a result, the first and second brake discs 8 and 9 are sandwiched between the first and second armatures 12 and 22 and the first and second side plates 11 and 21, and are frictionally engaged with these members. Is braked by. This braking state is maintained until the exciting coil 24 is energized.

In order to release the braking when the energizing coil 24 cannot be energized at the time of a power failure or maintenance / inspection work, first, as shown in FIGS. To do. Then, the operation lever 72 of the rotation operation device 16 is gripped and swung toward the first link 61 side.
By swinging the operation lever 72 in this way, the first link 61 of the rotation operation device 16 pushes the release lever 43, and the release lever 43 swings in the operation direction, so that the release bolt 41 is moved to its head. The part 41 a is moved in a direction away from the second field core 23. As the release bolt 41 moves in this manner, the first and second armatures 12 and 22 move toward the first and second field cores 13 and 23 against the spring force of the braking spring 34. , Braking is released.

  In order to keep the non-excited operation brake 1 in a released state, the operation lever 72 is moved until the first link 61 and the second link 63 abut against the first and second covers 31 and 32. Rock. As described above, in a state where the links 61 and 63 are in contact with the covers 31 and 32, the release lever 43 is held in the swinging position even when the hand holding the operation lever 72 is released, and the braking is released. Maintained in a state.

Therefore, since the non-excitation actuating brake 1 according to this embodiment can be used in a state where the rotation operation device 16 is not mounted, the manufacturing cost is reduced by the amount that the rotation operation device 16 is not incorporated. Can be provided inexpensively.
In order to manually release the brake when the non-excitation brake 1 is in a braking state, the rotation operation device 16 is mounted on the locking member 52 of the release lever 43 and the installation portion 17, and the rotation operation is performed. This is done by pushing the release lever 43 using the device 16.

The rotation operation device 16 is configured by a toggle mechanism 64 in which a force P (output) for pushing the release lever 43 by the first link 61 becomes larger than an operation force F1 (input) applied to the second link 63. Therefore, the operating force F1 can be reduced. Further, the toggle mechanism 64 can be arranged along the non-excitation actuating brake 1, and the manual release device 42 can be made relatively compact as compared with the case where the operating force is reduced by a lever lever. Can be formed.
For this reason, according to this embodiment, it is possible to provide the manual release device 42 that is small in size and that can release the brake with a small operation force and that requires a small number of parts to be provided in the non-excitation operation brake 1.

The second link 63 according to this embodiment includes an operation lever 72 that extends from the connecting portion with the first link 61 to the side opposite to the shaft portion 71a.
For this reason, according to this embodiment, the second link 63 moves the first link 61 against the operating force F0 that the operator grips the operation lever 72 and swings the second link 63. The pushing force F1 can be increased by this principle. Therefore, according to this embodiment, the release lever 43 can be swung with a smaller operating force.

  In the rotation operation device 16 according to this embodiment, the first link 61 and the second link 63 are used as the restricting portions (the first and second covers 31 and 32 in the embodiment) of the non-excitation brake 1. It is formed so that it can move until it abuts. In this state, when the hand is released from the operation lever 72 of the second link 63, one end portion (engagement member 65) of the first link 61 is pushed back by the spring force of the braking spring 34, whereby the first, The second links 61 and 63 are pressed against the restricting portion. For this reason, according to this embodiment, even if the operator loosens the force of pushing the second link 63 by moving the first link 61 and the second link 63 until they abut against the restricting portion. The brake is kept released. Therefore, according to this embodiment, there is provided a manual release device 42 for a non-excitation actuating brake having a simple structure that has both the function of an automatic return type manual release device and the function of a release-hold type manual release device. be able to.

The brake release operation element (release lever 43) according to this embodiment has a connection portion with the first link 61 (locking member 52) as a power point and a connection portion with the armature side member (release bolt 41). The lever is used as an action point. For this reason, the force by which the brake release operator moves the armature side member is larger than the force applied from the first link 61 to the brake release operator.
Therefore, according to this embodiment, it is composed of the operation lever 72 of the rotation operation device 16, the toggle mechanism 64 configured to increase the output of the rotation operation device 16, and the release lever 43. A significant reduction in operating force can be achieved.

  The installation portion 17 according to the above-described embodiment employs a configuration that restricts the movement of the shaft portion 71 a using the rear housing 3. However, a step (not shown) provided on the mounting plate 4 can be used to restrict the movement of the shaft portion 71a (movement in the direction along the outer surface of the non-excitation actuating brake 1).

  Further, in the above-described embodiment, when the release bolt 41 moves in parallel, the first and second armatures 12 and 22 move toward the first and second field cores 13 and 23 to release the braking. An example in which the present invention is applied to a non-excitation brake 1 is shown. However, the mechanism for releasing the braking of the non-excitation brake 1 is not limited to the above-described mechanism, and can be changed as appropriate. That is, for example, the present invention can also be applied to a non-excitation brake that releases braking using an eccentric pin as disclosed in Patent Document 1.

  DESCRIPTION OF SYMBOLS 1 ... Non-excitation actuating brake, 2 ... Motor, 3 ... Rear housing, 4 ... Mounting plate, 5 ... Rotating shaft, 8, 9 ... 1st, 2nd brake disk, 11, 21 ... 1st, 2nd side Plates 12, 22 ... first and second armatures 13, 23 ... first and second field cores, 16 ... rotating operation device, 17 ... installation part, 24 ... exciting coil, 31, 32 ... cover, 34 ... Brake spring, 41 ... Release bolt, 42 ... Manual release device, 43 ... Release lever, 52 ... Locking member, 61 ... First link, 62 ... Connection bolt, 63 ... Second link, 65 ... engaging member, 65a ... engaging groove, 66 ... coupling member, 67 ... adjusting member, 71 ... support member, 71a ... shaft portion, 72 ... operating lever.

Claims (4)

A brake release operator that releases the brake by moving the armature to the field core against the spring force of the brake spring of the non-excitation brake;
An installation portion provided on the outer surface of the portion that does not move relative to the field core;
A rotation operation device detachably attached to the operation element and the installation unit;
The rotating operation device is configured such that an engaging portion that is detachably and rotatably engages with the operating element is provided at one end and the brake is released in a state where the engaging portion is engaged with the operating element. A first link extending in a direction opposite to the operation direction of the operator,
A shaft portion that is supported by the installation portion in a swingable manner and in a state in which movement in the direction along the outer surface is restricted is provided at one end portion, and the other end portion of the first link is rotated at the other end portion. A toggle mechanism having a second link for operation connected movably,
The toggle mechanism is configured such that the first link pushes the operation element with a force larger than the operation force when the second link is swung with a predetermined operation force around the installation portion. A manual release device for a non-excited operation brake, characterized in that   2. The manual release device for a non-excited operation brake according to claim 1, wherein the second link includes an operation lever that extends to a side opposite to the shaft portion from a connection portion with the first link. Manual release device for non-excited operation brake.   3. The manual release device for non-excitation actuated brake according to claim 1, wherein a connection portion between the first link and the second link of the rotation operation device is connected to the first link of the operation element. In a state in which it is formed so as to be movable toward the non-excitation actuating brake side from a virtual line connecting the portion to be installed and the installation part, and in a state of moving from the virtual line to the non-excitation actuating brake side, The manual release device for non-excitation actuated brake is characterized in that further movement is restricted by the contact of the non-excited brake.   The manual release device for a non-excitation actuated brake according to any one of claims 1 to 3, wherein the brake release operation element has a connection portion with the first link as a power point and an armature side member. A manual release device for a non-excitation actuating brake, characterized in that it constitutes a lever having a connecting portion as an action point.

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