JP4358287B1 - Manual release mechanism of electromagnetic brake - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manual releasing mechanism of an unexcited operation type electromagnetic brake usable even outdoors, capable of manually releasing the electromagnetic brake by a simple structure and operation, and capable of preventing damage of a part by erroneous operation, a malfunction, generation of an abnormal sound, vibration and contact. <P>SOLUTION: A releasing cam 10, a cam base 20 and a releasing arm 30 are built in a brake cover 80, and the brake is manually released by pressing an armature 40 by a projection part 36 of the releasing arm 30 by rotating the releasing cam 10 from an external part by a manual releasing means such as a driver via an insertion hole 80a. The brake can also be operated by rotating the releasing cam 10 by about 180 degrees in the inverse direction of this cam, and in either case, the releasing cam 10 and the releasing arm 30 are held in respective stable positions. Thus, the manual releasing mechanism is stored in the brake cover, and the brake is released without requiring to remove the part, and an operation state can be switched, and respective states can be stably maintained. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an electromagnetic brake, and more particularly to a manual release mechanism for manually releasing a non-excitation actuated electromagnetic brake.

  The non-excitation actuated electromagnetic brake operates so that the brake is released when the exciting coil is energized (energized) and brakes the braked shaft when de-energized (de-energized). Therefore, it is required to be able to release the brake manually even in a state where excitation is not possible, for example, during a power failure or a trial operation without a power source.

  As a manual release mechanism for such an electromagnetic brake, a collar and a brake cover that covers an electromagnetic brake portion composed of an electromagnetic coil, an armature, a brake disk, a side plate, etc. are screwed into a screw hole provided in the side plate. Some are attached via a sealing material (for example, see Patent Document 1). According to this, the armature and the brake disc can be separated from each other by replacing the screw with a length reaching the armature while securing the sealing property by the collar and the sealing material.

  In addition, a release cam for moving the armature away from the brake disc is provided outside the brake cover that covers the electromagnetic brake, and a manual release arm for rotating the release cam, and holding the arm in the brake operating position. Some arm holding metal fittings are provided (for example, see Patent Document 2). According to this, the brake can be released without requiring replacement of parts such as screws, and the position of the manual release arm in each of the brake operation state and the release state can be clearly determined. .

Further, there is a brake manual release means that is detachably engaged with the brake device (for example, see Patent Document 3). According to the present invention, the brake can be released by inserting the brake manual release means from the insertion hole provided in the brake cover and rotating the brake manual release means.
JP 2001-304314 A JP 2002-295551 JP 2004-350467 A

However, in the invention of Patent Document 1, it is necessary to replace a plurality of screws with ones for releasing a brake, and screw them in again, which is troublesome and may be lost during storage or replacement of the screws. is there.
On the other hand, in the invention of Patent Document 2, a plurality of release cams and a manual release arm for rotating the release cams protrude outside the cover, and are not a sealed structure. Also, means for fixing the release cam and release arm to prevent malfunction of the manual release mechanism due to vibration during motor rotation and to prevent the manual release mechanism from contacting each part and causing abnormal noise and damage The manufacturing process becomes complicated and the brake device becomes larger.
Furthermore, in the invention of Patent Document 3, if the manual release means is removed during normal operation, abnormal noise and damage can be prevented, but this may be lost during storage, and the release means is attached and detached and the arm is turned. There is a problem in workability because it requires a space for movement.

  Therefore, in order to solve the above problems, the present invention enables manual release of the brake with a simple structure and operation, and a built-in structure in which the manual release mechanism portion is housed in the brake cover and does not protrude to the outside. It is another object of the present invention to provide a manual release mechanism for an electromagnetic brake that can reliably maintain a brake operation state / release state in order to prevent malfunction due to vibration and abnormal noise / breakage due to contact. .

The present invention relates to a non-excitation operation type electromagnetic brake including a friction plate, a braking plate, an armature and a yoke housed in a brake cover.
The non-excitation operation type electromagnetic brake has a release cam, a cam base to which the release cam is attached, and a release arm in the brake cover,
The release arm includes a protrusion that extends opposite to the armature, a cam hole that engages with the release cam, a fixed portion that is fixed in the brake cover at an end opposite to the cam hole, and the fixed Having a root portion formed in an L shape on the extension of the portion;
The brake cover is provided with an insertion hole through which manual release means for rotating the release cam can be inserted,
By rotating the release cam by manual release means inserted from the outside of the brake cover through the insertion hole, the release arm is tilted with the fixing portion as a fulcrum through the cam hole. The aforementioned problems have been solved by a manual release mechanism of a non-excitation actuated electromagnetic brake characterized in that the brake is manually released by pressing the armature.

  The electromagnetic brake manual release mechanism according to the present invention has a simple structure including a release cam, a cam base, and a release arm, and the release cam is mounted by using a commonly used tool (jig) such as a (minus) driver. Since it is possible to switch between the brake operating state and the released state by an operation of only rotating about 180 degrees, there is an effect that the electromagnetic brake can be manually released with an extremely simple structure and operation. .

  Further, according to the present invention, both the release cam and the release arm are built in the brake cover, and it is only necessary that a hole for inserting a jig for rotating the release cam is provided in the brake cover. There is no need for a mechanism for fixing the manual release means outside the cover, the brake device does not increase in size, and it is not necessary to remove the manual release part, so there is no possibility of losing the part. In addition, both the release cam and release arm are built in the brake cover, and it is possible to make a sealed structure by fitting a sealing means in the insertion hole provided in the brake cover, so it can be used outdoors. Inadvertent operation due to carelessness can be prevented.

  Furthermore, according to the present invention, a change in operating force required to rotate the release cam (hereinafter, referred to as “click feeling”) when reaching each stable position in the brake operation state / release state is expressed as work. Can be given to a person. Further, since the manual release means can be held at each stable position, there is no risk of the brake being released due to a malfunction caused by vibration or the like, and the manual release means can be removed. Since there is no need for a dedicated mechanism for fixing it, there is an effect that it is possible to prevent the occurrence of abnormal noise and damage of parts due to vibration and contact.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a front view of a non-excitation operation type electromagnetic brake B having a manual release mechanism of a non-excitation operation type electromagnetic brake according to the present invention, and is a view seen through a brake cover 80. 2A is an exploded perspective view of the main part of the manual release mechanism of the non-excitation actuated electromagnetic brake B, that is, the release cam 10, the retaining ring 12, the cam base 20, and the release arm 30, and FIG. A side view of the cam 10 is a perspective view of the release arm 30 as viewed from the cam hole 32 side.
FIG. 3 shows the operating state (cam position: intermediate, release arm: free) of the non-excitation operation type electromagnetic brake B. FIG. 3A shows the brake cover 80 in a vertical cross section, and shows the internal structure as viewed from the side. (B) is a figure showing the state of the release cam 10 and the cam hole 32 at this time.
FIG. 4 shows the released state of the non-excitation actuated electromagnetic brake B (cam position: downward stable point (1), release arm: fixed), (a) shows the brake cover 80 in a longitudinal section, and the internal structure side. FIG. 5B is a diagram showing the state of the release cam 10 and the cam hole 32 at this time.
FIG. 5 shows the operating state of the non-excitation operation type electromagnetic brake B (cam position: upper stable point (1), release arm: fixed), (a) shows the brake cover 80 in a longitudinal section, and the internal structure side. FIG. 5B is a view showing the state of the release cam 10 and the cam hole 32 at this time.
FIG. 6 is a diagram illustrating a series of movements of the release cam 10 and the release arm 30 when switching from the brake operation state to the release state is performed.
In all the drawings from FIG. 1 to FIG. 6, the same reference numerals are assigned to the same components.

In the present invention, as shown in FIGS. 1 and 3 to 5, the release cam 10 is attached to the cam base 20 in the brake cover 80 that covers the non-excitation operation type electromagnetic brake B, and the insertion hole 80 a of the brake cover 80. Through this, a manual release means such as a (minus) screwdriver is inserted into the groove 10e and can be rotated left and right.
The cam base 20 has a stopper portion 20a bent into an L shape in order to restrict the movable range of the release arm 30, and is fixed to the anti-load side bracket 90 with a bolt.
As shown in FIGS. 2A and 2B, the release cam 10 has an annular groove 10c. When the release cam 10 is attached to the cam base 20, the release cam 10 is a retaining ring 12 that fits into the cam groove 10c. While being allowed to rotate, it is prevented from being removed. The columnar portion 10d of the release cam 10 functions as a rotation shaft.
Further, the release cam 10 is engaged with the release arm 30 through the cam hole 32 of the release arm 30, and the release arm 30 is fixed to the anti-load side bracket 90 at a position facing the release arm 30. . As a result, the release arm 30 can be tilted by elastic deformation with the fixing portion 34 as a fulcrum, as the release cam 10 rotates.
The release arm 30 has two protrusions 36 that press the armature 40 when the brake is released, and these two protrusions 36 face the armature 40 through notches 50a provided in the brake plate 50. It extends to. In addition, a root portion 38 formed in an L shape on the extension of the fixed portion 34 at a position facing the tip end portion of the release arm provided with the cam hole 32 is provided when the release arm 30 is interlocked with the release cam 10. The width is easy to cause elastic deformation.
Then, as far as possible within the brake cover 80, the cam base 20 is fixed at the farthest position facing the fixing position of the fixing portion 34, and the release cam 10 is rotated at the same position. Further, the protrusions 36 are positioned at the positions where the armature 40 can be most efficiently pressed against the yoke, that is, at both ends on a straight line that crosses substantially the center of the straight line connecting the fixing portion 34 and the operating position of the release cam 10. Has been placed. With such a configuration, the distance between the fixing portion 34 (fulcrum) and the release cam 10 (power point) can be made larger than the distance between the fixing portion 34 (fulcrum) and the protrusion 36 (action point). The lever principle can be used effectively, and the protrusion 36 (working point) can be moved by rotating the release cam 10 (power point) with a relatively small operating force. The state / release state can be switched.

In the present invention, the release cam 10 is an eccentric cam, and as shown in FIGS. 2 and 3 to 5B, a rotating body 10a that is directly rotated by manual release means such as a (minus) driver (not shown). (A circle indicated by a dotted line in FIGS. 3 to 5 (b)) rotates around a point C where two axes x and y intersect with each other, but engages with the cam hole 32 and tilts the release arm 30. 10b (circle indicated by a solid line in FIGS. 3 to 5B) is formed with a center point shifted from the rotating body 10a. The semicircular net-like portions in FIGS. 3 to 5 (b) and FIG. 6 show the semicircular portion on the side overlapping with 10b out of 10a having two semicircular portions sandwiching the groove 10e, As a result, the rotation state of the release cam 10 can be understood.
Further, as shown in these drawings, the eccentric body 10b of the release cam 10 has a D shape having an arc portion and a flat portion 10f, and a cam hole 32 of the release arm 30 is also partially (in this embodiment, , The left side surface) has an arc-shaped portion 32a only and has a substantially D shape.
In addition, in the drawing showing the state and action of the release cam, for the sake of convenience, the side of the anti-load side bracket is shown as bottom, and the release arm side is shown as up. And

FIG. 3 shows the operating state of the non-excited operation type electromagnetic brake B (when not energized). The armature 40 is separated from the yoke 60 and is brought into pressure contact with the friction plate 70 by the action of a braking spring (not shown). Thus, the braked shaft (not shown) is in a braking state.
At this time, the release cam 10 is in an intermediate position that is not rotated to the left or right, and therefore the release arm 30 is in a free (non-fixed) state (see the free stable point in FIG. 6).

From this state, the brake can be manually released by rotating the release cam 10 counterclockwise. FIG. 4 is a diagram showing the state of (a) the internal structure and (b) the release cam in this brake released state.
The release cam 10 rotated counterclockwise passes through the arc-shaped portion 32 a of the cam hole 32. The release arm 30 pressed in the yoke direction by the release cam 10 through the cam hole 32 is elastically deformed toward the yoke 60 side with a base portion 38 formed in an L shape on the extension of the fixed portion 34 as a base point. As shown in FIG. 4A, the two protrusions 36 come into contact with the armature 40, and the brake is released by pressing the armature 40 toward the yoke 60 against the reaction force of the braking spring.

  As described above, the eccentric body 10b of the release cam 10 has a D shape in which a part thereof is a flat portion 10f. Therefore, the flat portion 10f is in contact with the linear yoke-side end surface 32b of the cam hole 32. Thus, the force by which the release cam 10 pushes the release arm 30 toward the yoke and the reaction force due to the elastic deformation of the release arm 30 are balanced, and a stable state is obtained (see the lower stable point (1) in FIG. 4B and FIG. 6). ). Accordingly, it is possible to give the operator a click feeling informing that the stable position in the brake release state has been reached, and to hold the brake manual release mechanism at the stable position.

  When the release cam 10 is further rotated counterclockwise, the release cam 10 reaches the right-angle shaped portion 32 c of the cam hole 32. Since the release arm 30 is pushed in the direction of the yoke 60 by elastic deformation and pushed in the direction of the stopper portion 20a of the cam base, the movement of the release arm 30 is abutted against the stopper portion 20a. The rotation is suppressed (see the lower stable point (2) in FIG. 6). In this way, the rotation is limited to about 180 degrees.

On the other hand, when the release cam 10 is rotated clockwise, the brake can be operated again. FIG. 5 shows the state of (a) internal structure and (b) release cam in this brake operating state.
When the release cam 10 is rotated clockwise, it passes through the arc-shaped portion 32a of the cam hole 32. The release arm 30 pressed in the anti-yoke direction by the release cam 10 through the cam hole 32 is elastically deformed toward the anti-yoke 60 side with a base portion 38 formed in an L shape on the extension of the fixed portion 34 as a base point. Thus, as shown in FIG. 5A, the two protrusions 36 are separated from the armature 40. Since the armature 40 is pressed against the friction plate 70 by the action of a brake spring (not shown), the brake is again activated.

  When the release cam 10 is further rotated clockwise, the release cam 10 reaches another right-angled portion 32d of the cam hole 32. The release arm 30 is pushed in the direction of the anti-yoke 60 by the release cam 10 and also pushed in the direction of the stopper portion 20a of the cam base, so that the movement of the release arm 30 is abutted against the stopper portion 20a. Further rotation is suppressed (see the upper stable point (1) in FIG. 6). In this way, the release cam 10 can be rotated up to about 180 degrees.

  Then, when the flat portion 10f of the D-shaped release cam 10 balances the force that pushes the cam hole 32 toward the anti-yoke side and the force due to the elastic deformation of the release arm 30, the upper stable point (1) in FIG. Stable at this position.

Here, as shown in FIGS. 5B and 6, the straight anti-yoke side end surface 32 e of the cam hole 32 is inclined from the arc-shaped portion 32 a toward the right-angled portion 32 d toward the yoke. If formed in this way, further stabilization can be realized.
That is, when the release cam 10 is further rotated clockwise from the state of the upper stable point (2), the elastic deformation force of the release arm 30 becomes the maximum, and the position beyond that, that is, the D-shaped release. The flat portion 10f of the cam 10 comes into contact with the linear anti-yoke side end surface 32e of the cam hole 32 and is stabilized in a state where the elastic deformation force of the release arm 30 is lower than the maximum elastic deformation force (FIG. 5B). And the upper stable point (1) in FIG. 6).
In order to change from this state to the upper stable point (2), energy for overcoming the maximum elastic deformation force of the release arm 30 and rotating the release cam 10 counterclockwise is required. Therefore, according to this configuration, not only can the operator be given a click feeling clearly indicating that the brake operation state has reached the stable position, but the possibility of the brake being released due to a malfunction can be significantly reduced. In addition, since the brake manual release mechanism can be held in a stable state, it is possible to eliminate the possibility of occurrence of abnormal noise and damage of parts due to vibration and contact.

The operation of the release cam 10 and the release arm 30 between the free stable point and the upper stable point (1) will be described in further detail with reference to FIG.
At the free stable point, the elastic deformation amount of the release arm 30 is zero.
Next, at the upper unstable point, due to the elastic deformation force of the release arm 30, the counterclockwise rotational torque becomes larger than the frictional resistance between the release cam 10 and the cam hole 32, so that the release cam 10 rotates counterclockwise. Rotating, the force toward the free stable point works.
On the other hand, when reaching the upper stable point (2), the release cam 10 presses the anti-yoke side end surface 32e of the cam hole 32 in the anti-yoke direction, while the release cam 30 is moved to the yoke side by the elastic deformation force of the release arm 30. Pressed. The rotational torque generated thereby and the friction resistance of the release cam 10 and the anti-yoke side end face 32e of the cam hole 32 are in a balanced state, and the counterclockwise rotation of the release cam 10 is suppressed and the position is maintained.
As apparent from FIG. 6, at the upper stable point (1), the flat portion 10f of the D-shaped release cam 10 is in contact with the end surface 32e on the side opposite to the yoke of the cam hole 32 inclined toward the yoke. And is in a more stable state than the upper stable point (2). Therefore, in order to move from the upper stable point (1) to the upper stable point (2), the maximum elastic deformation force of the release arm 30 between these stable positions is overcome, and the release cam 10 is rotated counterclockwise. Since energy for rotation is required, the release cam 10 and the release arm 30 are maintained in a more stable state.

  As described above, in the present invention, the release arm 30 is an L-shaped member formed at a position facing the release cam 10 (power point), a fixed portion 34 (fulcrum), and an elastically deformable width on its extension. Since it has the root portion 38, by using the principle of the lever, by moving the projection portion 36 (action point), with a relatively small force and a simple operation of rotation within a range of about 180 °, An excellent effect is achieved in that manual release and operation of the brake can be switched.

  As described above, in the present invention, the release cam is rotated by a generally used tool (jig) such as a (minus) driver. Therefore, if the insertion hole 80a is provided in the brake cover, Well, the cap 82 to be fitted into the insertion hole 80a is made of rubber or the like, so that it can be made dustproof and waterproof and can be used outdoors.

In this embodiment, the brake is released by rotating the release cam counterclockwise, and the brake is operated by rotating clockwise. However, each rotation direction is reversed. The release cam can be rotated clockwise to release the brake, or counterclockwise to set the brake to be in the activated state.
Further, when the yoke side end surface 32b of the cam hole 32 is formed so as to incline toward the anti-yoke side (opposite to the inclination of the anti-yoke side end surface 32e) from the arc-shaped part 32a toward the right-angled part 32c. Further, it is possible to obtain a larger click feeling indicating that the stable position in the brake released state has been reached, and to further stabilize the brake released state.

The figure which looked through the brake cover 80 in the front view of the non-excitation action | operation type electromagnetic brake B provided with the manual release mechanism of the non-excitation action | operation type electromagnetic brake of this invention. (A) is an exploded perspective view of the main part of the manual release mechanism of the non-excitation actuated electromagnetic brake B, the release cam 10, the retaining ring 12, the cam base 20, and the release arm 30, and (b) is a side view of the release cam 10. FIG. 4C is a perspective view of the release arm 30 viewed from the cam hole 32 side. The operation state of the non-excitation operation type electromagnetic brake B (cam position: intermediate, release arm: free) is shown, (a) shows the brake cover 80 in a longitudinal section, and the internal structure seen from the side, (b) FIG. 4 is a diagram showing the state of the release cam 10 and the cam hole 32 at this time. The non-excitation actuated electromagnetic brake B is released (cam position: downward stable point (1), release arm: fixed), (a) shows the brake cover 80 in a longitudinal section, and the internal structure is viewed from the side. FIG. 4B is a diagram illustrating the state of the release cam 10 and the cam hole 32 at this time. The operation state of the non-excitation operation type electromagnetic brake B (cam position: upper stable point (1), release arm: fixed) is shown. (A) shows the brake cover 80 in a longitudinal section, and the internal structure is viewed from the side. FIG. 4B is a diagram illustrating the state of the release cam 10 and the cam hole 32 at this time. The figure which shows a series of motions of the release cam 10 and the release arm 30 at the time of switching from a brake operation state to a release state.

Explanation of symbols

B: Non-excitation actuated electromagnetic brake 10: Release cam 20: Cam base 20a: Stopper portion 30: Release arm 32: Cam hole 32a: Arc-shaped portion 32b: Yoke side end surface 32c, d: Right angle shape portion 32e: Anti-yoke side End face 34: Fixed portion 36: Protruding portion 38: Root portion 40: Armature 50: Braking plate 60: Yoke 70: Friction plate 80: Brake cover 80a: Insertion hole

Claims (5)

In the non-excitation actuated electromagnetic brake having a friction plate, a brake plate, an armature and a yoke housed in the brake cover,
The non-excitation operation type electromagnetic brake has a release cam, a cam base to which the release cam is attached, and a release arm in the brake cover,
The release arm includes a protrusion that extends opposite to the armature, a cam hole that engages with the release cam, a fixed portion that is fixed in the brake cover at an end opposite to the cam hole, and the fixed Having a root portion formed in an L shape on the extension of the portion;
The brake cover is provided with an insertion hole through which manual release means for rotating the release cam can be inserted,
By rotating the release cam by manual release means inserted from the outside of the brake cover through the insertion hole, the release arm is tilted with the fixing portion as a fulcrum through the cam hole. The brake is manually released by pressing the armature,
Manual release mechanism for non-excitation actuated electromagnetic brake.   The release cam is rotated in a direction opposite to the manual release direction and reaches a position different from the manual release state, so that the brake is activated, and the release cam is elastically counteracted by the release arm in the activated state. The manual release mechanism of a non-excitation actuated electromagnetic brake according to claim 1, wherein the position of the release cam and the release arm is maintained by receiving a force.   The manual release mechanism of a non-excitation actuated electromagnetic brake according to claim 1 or 2, wherein the cam base has a stopper portion for restricting a movable range of the release arm, and thereby a rotation angle of the release cam is restricted. .   The release cam is an eccentric cam and has a D shape having an arc portion and a flat portion, and / or a cam hole of the release arm has a substantially D shape having an arc shape portion and a right angle shape portion. A manual release mechanism for a non-excited electromagnetic brake of any one of 1 to 3.   The linear anti-yoke side end surface of the cam hole is inclined toward the yoke side from the arc-shaped portion side toward the right-angled shape portion, and / or the linear yoke side end surface of the cam hole is The manual release mechanism for a non-excitation actuated electromagnetic brake according to any one of claims 1 to 4, wherein the manual release mechanism is inclined toward the anti-yoke side from the arcuate part toward the right-angle part.

Images