JP4187185B2 - Non-excitation brake - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a non-excited operation brake in which a brake disk provided between an armature and a side plate is braked by a spring force of a brake spring by interrupting energization to an electromagnetic coil.
[0002]
[Prior art]
The non-excitation actuating brake is mounted on a braked machine such as a motor, and is used as a safety device that brakes the inertial rotation of the rotating shaft after driving is stopped and holds the rotating shaft in a stationary state. The non-excitation brake includes an armature that is movable only in the axial direction on the magnetic pole surface side of the field core in which the electromagnetic coil is installed, a brake disk that is attached to the rotating shaft of the braked machine via an inner driver, and Side plates fixed to the field core are sequentially stacked, and the outer peripheral surface side of the armature is engaged with a fastening member that fixes the side plate to the field core, and a braking spring is provided to press the armature to the side plate side. Yes.
[0003]
The non-excited operation brake having such a configuration releases the brake disc brake by energizing the electromagnetic coil and magnetically attracting the armature to the magnetic pole surface of the field core against the spring force of the brake spring. Further, by shutting off the energization to the electromagnetic coil, the armature is pressed to the side plate side by the spring force of the braking spring, and the brake disc is braked by the frictional engagement between the armature and the side plate.
[0004]
In the non-excitation brake that operates in this way, when the electromagnetic coil is de-energized, the armature collides with the side plate via the brake disk that is spinning due to the spring force of the brake spring. Sometimes an unpleasant collision sound is generated. In addition, an unpleasant engagement sound (squealing sound) is generated by frictional engagement between the armature and the brake disc and between the brake disc and the side plate.
[0005]
As a non-excited operating brake that solves the problem of operating noise such as collision noise and engagement sound, a non-excited operating brake described in Japanese Patent Application Laid-Open No. 2001-65606 is typical. The non-excited operation brake disclosed in the above publication suppresses the generation of operation noise by adopting a structure in which a vibration-proof sheet for enhancing vibration damping is sandwiched between two plates. Further, the non-excitation actuating brake of the above publication has a structure in which a screw hole for fastening a cover is formed in a side plate, the cover is covered with the side cover, and is attached later by a fastening member (screw). Further, the non-excitation actuating brake of the above publication is attached to a bracket of a motor, as in the motor with a brake of Japanese Utility Model Publication No. 57-6360, FIG. 1 or FIG.
[0006]
[Problems to be solved by the invention]
In the conventional non-excitation brake, the inner driver easily falls off from the center hole (for example, spline hole) of the brake disk, and it may not be easily mounted on the braked machine. Further, in the conventional non-excitation brakes provided with the vibration-proof sheet, it is necessary to improve the side plate in order to reduce the cost. An object of the present invention is to provide a non-excitation operating brake in which an inner driver is prevented from falling off, and to provide an inexpensive non-excitation operating brake in which the generation of operation noise is suppressed with a simple configuration.
[0007]
[Means for Solving the Problems]
In order to achieve such an object, the non-excited operation brake of the first invention includes an armature movable only in the axial direction and a rotatable brake disc on the magnetic pole surface side of a field core provided with an electromagnetic coil, And a non-excited operation brake in which the brake disk is braked by pressing the armature against the side plate by a spring force of a brake spring, and the side plates fixed to the field core are sequentially stacked. An inner driver fitted in the hole is provided between the bearing fitted to the inner peripheral surface of the field core and the cover covered by the side plate, and moved in the axial direction by the inner ring of the bearing and the cover. It is characterized in that the inner driver is prevented from falling off by restricting . In the non-excitation brake with the above configuration, the inner driver fitted in the center hole of the brake disc is moved in the axial direction by the bearing fitted in the inner peripheral surface of the field core and the cover covered by the side plate. As a result, the inner driver can be prevented from falling off from the center hole of the brake disc.
[0008]
The non-excitation operating brake of the second invention is the non-excitation operating brake of the first invention, wherein the cover is fixed to the side plate by a fastening member for fixing the side plate to the field core, and between the side plate and the cover. It is characterized by sandwiching an anti-vibration sheet. The non-excitation brakes with the above configuration do not require a structure in which the side plate is sandwiched between two plates, and there is no need to attach a cover to the side plate. The cost of non-excited brakes can be reduced.
[0009]
The non-excitation actuating brake of the third invention is the non-exciting actuating brake of the second invention, wherein the cover includes a disc part superimposed on the side surface of the side plate and an outer peripheral surface of the disc part from the field core side. A flat plate-shaped vibration-proof sheet is formed on the outer peripheral surface side of the disc portion, and a recessed portion to be fastened with a through hole through which a fastening member is inserted is formed. An engaging groove that is engaged with the fastened portion of the cover is formed on the outer peripheral surface of the cover. In the non-excitation operation brake having the above-described configuration, since the compression allowance of the vibration-proof sheet is set depending on the protruding amount of the fastened portion of the cover, the vibration-proof sheet can be easily incorporated.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the non-excitation brake shown in FIGS. 1 to 3 will be described as an embodiment of the present invention. FIG. 1 is a cross-sectional view of a non-excitation actuating brake attached to a motor bracket. FIG. 2 is a plan view of a non-excitation brake. FIG. 3 is a plan view of the vibration-proof sheet.
[0011]
The non-excited operation brake 1 has a field core 3 that is fixed to a bracket of a motor 2 as a braked machine with a screw. This field core 3 is formed with an annular groove 3a that is opened in the axial direction and accommodates an electromagnetic coil 4 that is wound in multiple strands, and the opening-side end surface is an annular magnetic pole surface 3b. Further, the magnetic pole surface 3b of the field core 3 on the radially outer side of the magnetic pole surface 3b has a screw hole 3c formed at a position that divides the circumferential direction into three equal parts, and a position that equally divides the circumferential direction into three equal parts. A spring hole 3d drilled in the inner surface of the magnetic pole surface 3d is provided, and an annular recess 3e is provided on the radially inner magnetic pole surface 3b. Further, a stepped inner peripheral surface 3f is formed at the center of the field core 3, and a bearing 11 is press-fitted into a portion of the inner peripheral surface 3f having a larger inner diameter. The tip of the rotating shaft 2a of the motor 2 is press-fitted into the bearing 11.
[0012]
On the side of the magnetic pole surface 3b of the field core 3 having such a shape, a disk-shaped side plate 5 in which a through hole 5a is formed at a position where the circumferential direction is equally divided into three is provided with a fixing screw 6a (fastening member). ) And a collar 6b (gap adjusting member). The fastening means 6 is fixed at a predetermined interval in the axial direction. That is, the side plate 5 is fixed to the field core 3 by inserting the fixing screw 6 a from the through hole 5 b of the side plate 5 into the collar 6 b and screwing into the screw hole 3 c of the field core 3. Further, the gap between the armature 7 and the field core 3 described later is adjusted by interposing the collar 6b.
[0013]
Between the field core 3 and the side plate 5, there is provided a disk-shaped armature 7 in which through holes 7a are formed at positions that divide the circumferential direction into three equal parts. The armature 7 is supported by the field core 3 so as to be movable only in the axial direction because the collar 6b of the fastening means 6 that fixes the side plate 5 to the field core 3 is inserted into the through hole 7a. Reference numeral 8 denotes a bush which is press-fitted and fixed in the through hole 7a of the armature 7 in order to prevent an unpleasant collision sound with the collar 6b and to smoothly slide the armature 7 on the collar 6b. Reference numeral 15 denotes a rubber O-ring which is fitted in the recess 3 e of the field core 3 and is sandwiched between the field core 3 and the armature 7. The O-ring 15 is provided in order to prevent the generation of suction sound when the armature 7 is magnetically attracted to the field core 3.
[0014]
A disc-shaped brake disk 9 is interposed between the side plate 5 and the armature 7 arranged in the field core 3 in this way. A substantially square center hole 9a is formed at the center of the brake disk 9, and an inner driver 10 having a substantially square cross section is inserted and fitted in the center hole 9a so as to be integrally rotatable. The inner driver 10 is mounted on a rotating shaft 2a of the motor 2 so as to be integrally rotatable with a key or the like, and supports the brake disc 9 so as to be movable only in the axial direction. Further, an end portion 10 a that contacts only the inner ring of the bearing 11 is formed on the side surface of one end of the inner driver 10. Furthermore, an arc portion 10b formed on a circle having a diameter smaller than that of the diagonal line is provided at the corner of the outer peripheral surface of the other end of the inner driver 10.
[0015]
The side plate 5 is covered with a cover 12. The cover 12 includes a disc portion 12a superimposed on the other side surface of the side plate 5, and a recessed fastening portion formed at a position where the outer peripheral surface side of the disc portion 12a is equally divided into three in the circumferential direction. A portion 12b, a through hole 12c drilled in the fastened portion 12b, a cylindrical portion 12d extending from the outer peripheral surface of the disc portion 12a to the field core 3 side, and a center of the disc portion 12a. The center hole 12e is provided. The center hole 12e is set to have a diameter smaller than the diagonal of the corner of the inner driver 10, and the peripheral surface faces the arc portion 10b. A fixing screw 6 a for fixing the side plate 5 to the field core 3 is inserted into the side plate 5 and the through holes 5 a and 12 c of the cover 12, and the side plate 5 and the cover 12 are fixed to the field core 3 together.
[0016]
The inner driver 10 is inserted from the side plate 5 side, fitted into the center hole 9a of the brake disk 9 until the end portion 10a contacts the inner ring of the bearing 11, and the cover 12 is put on the side plate 5 with the cover 12 crowned. Thus, the arc portion 10b is arranged to engage with the center hole 12e of the cover 12. Further, by fixing the cover 12 and the side plate 5 to the field core 3 with the fixing screws 6 a, the inner driver 10 is restricted from moving in the axial direction between the bearing 11 and the cover 12.
[0017]
A flat anti-vibration sheet 13 is provided between the side plate 5 and the disc portion 12 a of the cover 12. An engagement groove 13 a that is engaged with the fastened portion 12 b of the cover 12 is formed on the outer periphery of the vibration-proof sheet 13. Further, the vibration isolating sheet 13 is sandwiched between the side plate 5 and the cover 12 by fixing the side plate 5 and the cover 12 together with the fixing screw 6a.
[0018]
The non-excitation actuating brake 1 having such a configuration is configured such that the bearing 11 is press-fitted into the inner peripheral surface 3f of the field core 3 in which the electromagnetic coil 4 is accommodated, the brake spring 14 is inserted into the spring hole 3d, and the recess After fitting the O-ring 15 to 3e, the armature 7 is overlapped on the magnetic pole surface 3b side. Further, the collar 6 b is inserted into the through hole 7 a of the armature 7 through the bush 8, and the brake disk 9 and the side plate 12 are sequentially stacked on the armature 7. Further, the end 10 a is brought into contact with the bearing 11 while the inner driver 10 is fitted into the center hole 9 a of the brake disk 9. Furthermore, the cover 12 is attached to the side plate while the arcuate portion 10b and the center hole 12e of the cover 12 are engaged and the fastened portion 12b of the cover 12 and the engaging groove 13a of the vibration isolating sheet 13 are engaged. 5, the fixing screw 6 a is inserted into the cover 12, the through holes 12 c and 5 a of the side plate 5 and the collar 6 b and screwed into the screw holes 3 c of the field core 3, thereby completing the assembly. Also, by assembling in this way, the braking spring 14 interposed between the bottom of the spring hole 3d and the armature 7 is compressed, and the braking force of the braking spring 14 causes the brake disk 9 to move between the side plate 5 and the armature 7. It is pinched between. In the non-excitation brake 1, the rotary shaft 2 a is inserted and fitted to the inner driver 10 and the bearing 11, and the field core 3 is attached to the bracket of the motor 2.
[0019]
Further, in the braking state as shown in the figure, if the electromagnetic coil 4 is energized to generate a magnetic flux, the armature 7 is magnetically attracted to the magnetic pole surface 3b of the field core 3 against the spring force of the braking spring 14. The armature 7 is separated from the brake disc 9. Therefore, the braking of the brake disk 9 is released, and the rotating shaft 2a of the motor 2 is rotatable.
[0020]
Also, when turning off the power to the electromagnetic coil 4, more spring force of the brake spring 14, the brake disc 9 is frictionally engaged with that brake hold the armature 7 and the side plate 5. During such braking, anti-vibration sheet 13, the armature 7 by the spring force of the brake spring 14 at or uncomfortable collision sound generated colliding with the side plate 5 via the brake disc 9, the brake disc 9 rests Generation | occurrence | production of operation sounds, such as an unpleasant engagement sound (squealing sound) generated by the frictional engagement with the armature 7 and the brake disc 9 and the brake disc 9 and the side plate 5, are suppressed.
[0021]
【The invention's effect】
In the non-excited operation brake of the first invention configured as described above, the inner driver fitted in the center hole of the brake disk is covered with the bearing fitted on the inner peripheral surface of the field core and the side plate. Since the movement in the axial direction is restricted by the crowned cover, the inner driver is prevented from falling off from the central hole of the brake disc.
[0022]
In the non-excitation operation brake of the second invention, the cover is fixed to the side plate by the fastening member that fixes the side plate to the field core, and the vibration-proof sheet is sandwiched between the side plate and the cover. There is no need to have a structure with an anti-vibration sheet sandwiched between two plates, and there is no need to attach a cover to the side plate, reducing the number of parts, processing and assembly, and reducing the cost of non-excitation brakes. Figured.
[0023]
In the non-excited operation brake of the third invention, a cover in which a recessed portion to be fastened is formed in the disc part and a vibration isolating sheet in which an engagement groove is formed are provided, and the engagement groove of the vibration isolating sheet is provided. Since the compression allowance of the vibration-proof sheet is set according to the arrangement and assembly so as to be engaged with the fastened portion of the cover, the vibration-proof sheet can be easily assembled.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a non-excitation actuating brake attached to a motor bracket.
FIG. 2 is a plan view of a non-excitation brake.
FIG. 3 is a plan view of an anti-vibration sheet.
[Explanation of symbols]
1 Non-excitation brake 3 Field core 5 Side plate 6 Fastening means 6a Fixing screw (fastening member)
10 Inner driver 11 Bearing 12 Cover 13 Anti-vibration sheet

Claims (3)

An armature that can move only in the axial direction, a rotatable brake disk, and a side plate fixed to the field core are stacked in order on the magnetic pole surface side of the field core with an electromagnetic coil, and the spring force of the braking spring In the non-excitation operation brake in which the brake disc is braked by pressing the armature toward the side plate,
An inner driver to be fitted into the center hole of the brake disk is provided between the bearing fitted to the inner peripheral surface of the field core and the cover covered by the side plate, and the inner ring of the bearing and the cover Non-excited operation brake that prevents the inner driver from falling off by restricting movement in the axial direction . In the non-excited operation brake according to claim 1,
A non-excited operation brake characterized in that a cover is fixed to the side plate by a fastening member for fixing the side plate to the field core, and a vibration-proof sheet is sandwiched between the side plate and the cover. The non-excited operating brake according to claim 2,
The cover is provided with a disk part that is stacked on the side surface of the side plate, and a cylindrical part that extends from the outer peripheral surface of the disk part to the field core side, and is fastened to the outer peripheral surface side of the disk part. A recessed fastening portion having a through hole through which the member is inserted is formed, and an engagement groove that is engaged with the fastening portion of the cover is formed on the outer peripheral surface of the flat vibration-proof sheet. Non-excitation actuated brake characterized by

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