JPH0155812B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an electromagnetic brake device, and more particularly to an improvement in an electromagnetic brake device that can automatically adjust the gap between electromagnets when a brake plate is worn out.

[Prior art]

Figures 1 to 3 show a conventional electromagnetic brake device that can automatically adjust the gap between electromagnets, as disclosed in, for example, Japanese Utility Model Publication No. 58-53475. Figure 1 is a sectional view, and Figure 2 is a sectional view. FIG. 1 is a partially enlarged perspective view, and FIG. 3 is an enlarged perspective view of the second elastic body. In the figure, 1 is a brake box that is screwed to one end of a stator frame (not shown) of the motor, and 1a is a pair of guides formed in the axial direction at symmetrical positions on the inner peripheral surface of the brake box 1. The groove 1b is a braking surface formed on the inner end surface of the brake box 1, and 2 is a rotor shaft of an electric motor, one end of which is rotatably supported by the brake box 1 via a ball bearing 3. 2a is a serration formed on the outer peripheral surface of one end of the rotor shaft 2; 4 is an oil seal fitted on the inner peripheral surface of the brake box 1; and 5 is a serration (not shown) formed on the inner peripheral surface. This is a brake gear fitted to the serration 2a, and a gear 5a is formed on the outer periphery. Reference numeral 6 denotes a brake plate in which a toothed portion (not shown) formed on the inner peripheral portion is engaged with the toothed portion 5a so as to be slidable in the axial direction, and a brake lining is molded on the outer peripheral edge, and one part of the brake lining is molded on the outer peripheral edge. The end face faces the braking surface 1b. Reference numeral 7 denotes a pressing member consisting of a pressure plate whose one end face faces the other end face of the brake lining of the brake plate 6, and a pair of protrusions 7a extending loosely into the pair of guide grooves 1a are formed at symmetrical positions on the outer peripheral edge. This prevents the pressing member 7 from rotating. 7b
8 is a protrusion formed on the other end of the pressing member 7; 8 is a curved regulating member screwed to the other end of the pressing member 7 on which the protrusion 7b is formed; 9 is the other end of the pressing member 7; A movable iron core placed facing each other on the end side,
A protruding pressing portion 9a is formed at the center of the pressing member 7 side. Reference numeral 9b denotes a pair of protrusions extending and formed at symmetrical positions on the outer peripheral edge of the movable core 9, which are loosely fitted into the pair of guide grooves 1a to prevent the movable core 9 from rotating. . A fixed iron core 10 is screwed to the other end of the brake box 1 and faces one end surface of the movable iron core 9. 10a is a through hole formed in the center of the fixed core 10 in the axial direction;
0b is the through hole 10 on the outer periphery of the through hole 10a.
An annular recess formed concentrically with a, 11 is a brake coil wound around this annular recess 10b, and one end is connected to a stator winding (not shown) of an electric motor via a rectifier (not shown). It is connected. Reference numeral 12 denotes a lid body screwed to the outer peripheral edge of the through hole 10a, and 13 is loosely fitted into the through hole 10a and has a predetermined elastic force.
A first elastic body 14 made of a compression coil spring that abuts one end surface of the brake box 1 is a support member screwed to the upper inner end surface of the brake box 1, and is provided with a through female thread. Reference numeral 15 denotes a support shaft which is threadedly supported by the support member 14 and whose one end side is located between the opposing end surfaces of the pressing member 7 and the movable iron core 9;
By rotating, the relative position between one end surface and the other end side of the support member 14 can be adjusted. 16 is supported by the support shaft 15 so as to be movable in the axial direction of the support shaft 15, and when it is detached from the support shaft 15 and falls, it is automatically inserted between the pressing member 7 and the movable core 9, and the fixed core 10 The fixed core 10 when deenergized
and the movable iron core 9 to a predetermined gap G.
The lower end surface of the adjusting plate 16 that has fallen off from the support shaft 15 is supported by the protrusion 7b, and the movement of the adjusting plate 16 in the axial direction is controlled by the regulating member 8.
regulated by. A nut 17 is screwed onto the support shaft 15, and is designed to prevent movement of the support shaft 15 screwed onto the support member 14. 18
The mounting foot is screwed onto the upper surface of the pressing member 7 facing the adjustment plate 16 with a pair of machine screws, and
an engagement member that loosely fits onto the support shaft 15 and engages with one end side of the adjustment plate 16 to move each adjustment plate 16 to the end of the support shaft 15 and separate and fall from the support shaft 15;
Reference numeral 19 includes a horizontal portion 19a that has one end fixed to the upper inner end surface of the brake box 1 together with the support member 14 and extends in the axial direction, and the other end slopes downward to form an ∧ shape with the horizontal portion 19a. a second elastic body made of a plate spring member in which a bent portion 19b is formed;
The plurality of adjustment plates 16 are pressed against the engagement surface of the engagement member 18 by the bent portions 19b, thereby preventing the adjustment plates 16 from falling more than necessary from the support shaft 15. The fixed iron core 10, the brake coil 11, and the movable iron core 9 constitute an electromagnet 20, and the brake plate 6, the brake gear 5, and the rotor shaft 2 constitute a braked rotating body 21.

In this configuration, when the operation switch of the motor is turned on, alternating current is energized to the stator winding of the motor, and direct current rectified by the rectifier is energized to the brake coil 11, and the fixed iron core 10 is energized. The movable core 9 is attracted to the fixed core 10 against the spring pressure of the first elastic body 13 . Therefore, the braking torque that was pressing the brake plate 6 against the braking surface 1b via the movable iron core 9 and the pressing member 7 becomes zero, and the braked rotating body 21 starts rotating rapidly. When the operation switch of the electric motor is opened while the rotating body 21 to be braked is rotating, the fixed core 10 is deenergized, and the movable core 9 is pressed by the elastic force of the first elastic body 13, and the brake plate 6 is pressed by the pressing member 7. The brake lining is pressed against the braking surface 1b, and the braking torque generated at this time brakes the braked rotating body 21 to stop its rotation. Normally, the rotation of the braked rotating body 21 is repeatedly stopped as described above, but if the number of repetitions increases, the joint surface between the braking surface 1b and the brake plate 6 and the joint surface between the brake plate 6 and the pressing member 7 As the joint surface wears and the pressing member 7 and movable iron core 9 move toward the brake box 1 side, the first elastic body 13 expands and the elastic force tends to decrease, but the engagement member 18
As the adjustment plate 16 moves, the elastic force of the second elastic body 19 expands and moves to the end of the support shaft 15, detaching from the end and falling, and then the movable core 9 is attracted to the fixed core 10. When pressed, it is inserted between one end surface of the pressing member 7 and the protruding end surface of the pressing portion 9a of the movable core 9,
Since the elastic force of the first elastic body 13 is restored, the braking torque acting on the braked rotating body 21 is restored to the set value. Note that since the support shaft 15 is screwed onto the support member 14, the support shaft 15
is reliably maintained at a predetermined position, and even if vibration occurs due to rapid movement of the movable iron core 9, movement of the support shaft 15 is prevented. Further, since the adjustment plate 16 and the engagement member 18 are fitted into the support shaft 15 and the adjustment plate 16 is pressed in the direction of the engagement member 18 by the bent portion 19b of the second elastic body 19, This prevents the adjustment plate 16 from abnormally detaching and falling from the support shaft 15 due to vibration.

The conventional electromagnetic brake device equipped with automatic gap adjustment means of electromagnets is constructed and operates as described above, and includes a support member 14, a support shaft 15, a plurality of adjusting plates 16, a nut 17, and an engaging member 18. , and the second elastic body 19, the number of parts increases, the structure becomes complicated, and the cost increases.

[Summary of the invention]

The present invention was made in an attempt to eliminate such drawbacks, and includes a pressing member to which a support shaft is coupled, and a supporting shaft that is guided by the pressing member and can move in a direction substantially perpendicular to the axis of the rotary body to be braked. The structure is simple and inexpensive due to the structure, which includes a tapered wedge piece that increases the thickness in the direction perpendicular to the . This paper proposes a new electromagnetic brake device.

[Embodiments of the invention]

4 to 6 show an embodiment of the present invention. FIG. 4 is a partial sectional view, FIG. 5 is a sectional view taken in the - arrow direction of FIG. 4, and FIG. FIG. 5 is a side view of FIG. 5 when viewed in the direction of the arrow. In the figure, reference numerals 6 and 6 indicate a pair of brake plates disposed opposite to each other with a friction plate 22 interposed therebetween, and one brake plate 6 has both end surfaces connected to the braking surface 1b and one end surface of the friction plate 22, and the other brake plate Both end surfaces of the plate 6 are connected to the other end surface of the friction plate 22 and the pressing member 7.
They face one end face of each. In addition, the friction plate 22
A pair of protrusions (not shown) formed at symmetrical positions on the outer peripheral edge of the brake box 1 are loosely fitted into a pair of axial guide grooves (not shown) formed on the inner peripheral part of the brake box 1. movement is prevented. 7c is a wedge-shaped groove formed in the vertical direction substantially perpendicular to the axis of the rotary body 21 to be braked at one end of the pressing member 7; At the same time, a tapered wedge piece 24 whose other end side increases in thickness in the direction perpendicular to the moving direction is screwed to one end side of the inner peripheral part of the brake box 1 by a bolt 25, and has a through hole 24a formed therein. A support member 26 has one end screwed to one end of the pressing member 7 and passes through the through hole 24a, and a support shaft 27 has the support shaft 26 fitted therein, and the support shaft 27 extends in the radial direction of the support shaft 26. A joining member in which a semi-closed circular through hole 27a from which a part of the outer peripheral surface protrudes is formed in the center of one end side.
A pair of female through-threads (not shown) are formed at a predetermined interval in a direction perpendicular to the semi-closed circular through-hole 27a. Reference numeral 28 denotes a pair of bolts 29 screwed into one side of each of the pair of female through-threads of the joining member 27.
This is a support portion whose one end side is connected to the joint member 27 by a screw, and cooperates with the joint member 27 and the pair of bolts 29 to constitute a support member 30 of the wedge piece 23.
31 is a second leaf spring having a predetermined elastic force;
The connecting member 27 is made of an elastic body and is connected to the connecting member 27 by a pair of bolts 32 screwed onto the other side of a pair of female through-threads.
The support shaft 26 is connected to the other end surface, and the support shaft 26 is joined to the inner circumferential surface of the semi-closed circular through hole 27a with a predetermined elastic force. 33 is an electromagnet box screwed to the other end of the brake box 1, 33a is an intermediate wall portion formed at an axially intermediate portion of the electromagnet box 33, and 33b is an electromagnet box formed at the other end of the electromagnet box 33. protrusion, 33
c is a fitting part formed on the outer end side of the intermediate wall part 33a, 33d is a protrusion formed at a predetermined location below the inner end side of the intermediate wall part 33a, and 33e and 33f are the protrusions formed on the intermediate wall part 33a. A pair of through holes are formed on the same axis in the upper part of the portion 33b, 34 is a hollow spring receiver fitted in the through hole 33f, and 35 is a hollow spring receiver that is connected to the inner circumferential surface of the spring receiver 34 and the through hole. 33e, each having a through hole (not shown) at each end thereof, and a large diameter portion 35a is formed at a portion facing the inner circumferential surface of the through hole 33e. Reference numeral 10 denotes a fixed core of an AC electromagnet whose outer circumferential surface on one end side is fitted into a fitting portion 33c, and an annular recess 10b is formed on the other end side. Reference numeral 11 denotes a brake coil wound around the annular recess 10b, which is connected to a stator winding (not shown) of the motor and is excited by alternating current when the motor is energized.
9 is a movable core of an AC electromagnet facing the fixed core 10; 36 is a movable core support; one end is the movable core 9;
The intermediate portion is pivotally connected to the protrusion 33b via a pin 38, and the other end is coupled to one end of the draw rod 35 via a pin 39. Reference numeral 13 is a compression coil spring that is loosely fitted onto the outer peripheral surface of the draw rod 35 and whose both ends are inserted with a predetermined elastic force between one end surface of the spring receiver 34 and one end surface of the large diameter portion 35a. The first elastic body 40 is a lever whose one end is connected to a through hole at one end of the draw rod 35 with a pin 41, and whose one end surface on the other end abuts against the protrusion 33d. A protrusion 40a facing the lower side of the tapered surface of the wedge piece 23 is coupled. 42 is an electromagnetic box 33
The cover is removably screwed onto the outer end surface of the cover. Note that the movable iron core 9, the fixed iron core 10, and the brake coil 11 constitute an AC electromagnet 20, and the rotor shaft 2, the brake gear 5, and the pair of brake plates 6, 6 constitute a braked rotating body 21. . Also, a pull rod 35, a movable core support 36, a pin 37,
38, 39, 41 protrusions 33d, lever 40 and protrusion 40a constitute lever means 43.

Next, the operation of the device configured as described above will be explained. When the electric motor operation switch is turned on,
An alternating current is applied to the stator windings and brake coils 11 of the motor, the fixed core 10 is energized, and the movable core 9 is attracted to the fixed core 10 against the spring pressure of the first elastic body 13 . In this case, fixed core 1
The suction force of 0 is magnified by the lever ratio of the movable core support 36 and transmitted to the pull rod 35.
moves to the right in FIG. 4 against the spring pressure of the first elastic body 13. When the pull rod 35 moves to the right in FIG. 4, the lever 40 rotates clockwise about the protrusion 33d, and the protrusion 40a moves to the right in FIG. The pressing force becomes zero, and the braked rotating body 21 suddenly starts rotating. Moreover, when the operating switch of the electric motor is opened while the rotating body 21 to be braked is rotating, the fixed iron core 1
0 is deenergized, the pull rod 35 moves to the left in FIG. 4 due to the elastic force of the first elastic body 13, and the lever 40 rotates counterclockwise about the protrusion 33d as a fulcrum. As the protrusion 40a moves to the left in FIG. 4, the elastic force of the first elastic body 13 is expanded by the lever ratio of the lever 40, so that the tapered wedge piece 23→pressing member 7→one brake plate 6 →
The friction plate 22 → the other brake plate 6 → the braking surface 1b is transmitted to the braking surface 1b, the pair of brake plates 6, 6,
The braking rotating body 21 is braked and stops rotating by the braking torque generated by four-sided braking due to the pressure contact between the friction plate 22 and the pressing member 7. Normally, the rotation of the braked rotary body 21 is repeatedly stopped as described above, but if the number of repetitions increases, the pair of brake plates 6,
6 are worn, and the pair of brake plates 6, 6, friction plate 22, pressing member 7, tapered wedge piece 23, lever 40, pull rod 35, and movable core support 36 are moved to the brake box 1 side. 1st to move
The elastic body 13 tries to expand and the elastic force decreases, but when the fixed core 10 is energized, the tapered wedge piece 23 is guided by the wedge-shaped groove 7c of the pressing member 7, and as shown in FIG. In order to fall downward and be supported by the support member 30, the wedge piece 23 and the protrusion 4
Since the gap with 0a is restored to the set value, the elastic force of the first elastic body 13 is restored to the set value, and the braking torque acting on the braked rotating body 21 is also restored to the set value. Further, the gap between the opposing surfaces of the fixed core 10 and the movable core 9 when the fixed core 10 is deenergized is also restored to the set value. Also,
The pressing force with which the protrusion 40a presses the wedge piece 23 is P ₁ ,
The elastic force of the second elastic body 31 is P ₂ , and the combined force of the weight of the wedge piece 23 and the load due to vibration of the wedge piece 23 is P 2 .
Since P ₃ is set so that P ₁ > P ₂ > P ₃ , both the pressing member 7 and the support shaft 26 screwed to this pressing member 7 are covered by the pressing force P ₁ . Although it moves in the axial direction of the braking rotor 21, the support shaft 26 does not move due to the combined force _P3 of the weight of the wedge piece 23 and the load due to the vibration of the wedge piece 23. Although the electromagnet 20 is described as an AC electromagnet in this embodiment, it is not limited to this embodiment, and may be a DC electromagnet as in a conventional electromagnetic brake device. Further, although this embodiment has been described in which the lever means 43 is connected to an AC electromagnet, the present invention is not limited to this embodiment. Further, in this embodiment, a friction plate 2 is provided between the pair of brake plates 6, 6.
2, but the invention is not limited to this embodiment, and one brake plate 6 is pressed against the braking surface 1b via the wedge piece 23 and the pressing member 7, as in a conventional electromagnetic brake device. It can be something.

〔Effect of the invention〕

As explained above, in this invention, when the electromagnet is energized, the support shaft is guided by the coupled pressing member and can move in a direction substantially perpendicular to the axis of the rotary body to be braked, and the thickness in the direction perpendicular to the direction of movement can be reduced. It includes an increasing tapered wedge piece and a support member of the wedge piece whose one end side is joined to the support shaft via a second elastic body having a predetermined elastic force, and presses the pressing member with a pressing force P ₁
The relationship between the elastic force _P2 of the second elastic body and the resultant force _P3 of the weight of the wedge piece and the load due to vibration of the wedge piece is expressed as follows:
Since the structure is such that P ₁ > P ₂ > P ₃ , the structure is simple and inexpensive, and the electromagnetic brake device is equipped with an automatic gap adjustment means of electromagnets that can join the support member to the support shaft with a predetermined elastic force. It is effective in providing

[Brief explanation of drawings]

Figures 1 to 3 show an electromagnetic brake device equipped with a conventional automatic gap adjustment means for electromagnets, in which Figure 1 is a sectional view, Figure 2 is a partially enlarged perspective view of Figure 1, and Figure 3 is a partially enlarged perspective view of Figure 1. The figure is an enlarged perspective view of the second elastic body, FIGS. 4 to 6 show an embodiment of the present invention, FIG. 4 is a partial sectional view, and FIG. 6 is a side view of FIG. 5 viewed in the direction of the arrow. In the figure, 7 is a pressing member, 13 is a first elastic body, 20 is an electromagnet, 21 is a rotary body to be braked, 23 is a tapered wedge piece, 26 is a support shaft, 30 is a support member, and 31 is a second The elastic body 7c is a wedge-shaped groove. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. An electromagnet that is energized when energized to allow rotation of a rotary body to be braked, and when this electromagnet is deenergized, a pressing member to which a support shaft is connected is pressed to brake the rotary body to be braked. a first elastic body that is guided by the pressing member when the electromagnet is energized and can move in a direction substantially perpendicular to the axis of the rotary body to be braked, and has a tapered shape that increases the thickness in the direction perpendicular to the direction of movement; a wedge piece, and a support member for the wedge piece whose one end side is joined to the support shaft via a second elastic body having a predetermined elastic force, a pressing force P ₁ for pressing the pressing member;
The relationship between the elastic force P ₂ of the second elastic body and the resultant force P ₃ of the weight of the wedge piece and the load due to vibration of the wedge piece is set as P ₁ >P ₂ >P ₃ . Electromagnetic brake device. 2. Claims characterized in that one end of the tapered wedge piece is loosely engaged with a wedge-shaped groove formed on one end of the pressing member in a direction perpendicular to the axis of the rotating body to be braked. The electromagnetic brake device according to item 1. 3. The electromagnetic brake device according to claim 1, wherein the second elastic body is a leaf spring.