JP2003254359A - Non-energized actuated brake - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive non-energized actuated brake, in which slipping-off of an inner driver is prevented and operational noise is suppressed with simple structure. <P>SOLUTION: The inner driver 10 fitted in a center hole of a brake disc 9 is disposed between a bearing 11 fitted to an inner peripheral face of a field core 3 and a cover 12 on a side plate 5, so that the slipping-off of the inner driver 1 is prevented. A fixing screw 6a fixes the side plate 5 to the field core 3 to fix the cover 12 to the side plate 5, and a vibration isolating sheet 13 is sandwiched between the side plate 5 and the cover 12. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-excitation actuated brake in which a brake disc provided between an armature and a side plate is braked by a spring force of a braking spring by cutting off a current supply to an electromagnetic coil. Is.

[0002]

2. Description of the Related Art A non-excitation operated brake is mounted on a machine to be braked such as a motor and is used as a safety device for braking the inertial rotation of a rotary shaft after the drive is stopped to hold the rotary shaft in a stationary state. There is. An unexcited brake is an armature that is movable only in the axial direction on the magnetic pole surface side of a field core in which an electromagnetic coil is installed, and a brake disc that is mounted on the rotating shaft of the braked machine via an inner driver. The side plates fixed to the field core are sequentially stacked, 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 that presses the armature toward the side plate side is provided. There is.

The non-excitation actuated brake having such a structure is
The braking of the brake disc is released 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 braking spring. Further, by cutting off the power supply to the electromagnetic coil, the armature is pressed toward the side plate 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.

In the non-excitation brake operating in this manner, when the energization of the electromagnetic coil is cut off, the armature collides with the side plate through the idling brake disc due to the spring force of the braking spring. An unpleasant collision noise is generated when the disc is braked. Further, the frictional engagement between the armature and the brake disc and between the brake disc and the side plate causes an unpleasant engagement sound (squeaking noise).

As a non-excitation actuating brake that solves the problem of actuation noise such as collision noise and engagement noise, Japanese Patent Application Laid-Open No.
The non-excitation actuated brake described in JP-A No. 01-65606 is typical. The non-excitation actuated brake of the above publication is
The side plate has a structure in which a vibration damping sheet for enhancing the vibration damping property is sandwiched between two plates to suppress the generation of operating noise. The non-excitation actuated brake disclosed in the above publication has a structure in which a side plate is provided with a cover fastening screw hole, the side cover is covered with the cover, and the cover is retrofitted with fastening members (screws). Further, the non-excitation actuated brake of the above publication is mounted on a bracket of the motor, as in the motor with brake of Japanese Utility Model Laid-Open No. 57-6360, FIG. 1 or FIG.

[0006]

In the conventional non-excitation actuated brake, the inner driver is easily dropped from the center hole (for example, spline hole) of the brake disc, and it may not be easily mounted on the braked machine. It was Also,
In the conventional non-excitation actuated brake provided with the anti-vibration sheet, it was necessary to improve the side plate in order to reduce the cost. It is an object of the present invention to provide a non-excitation actuated brake in which the inner driver is prevented from falling off, and an inexpensive non-excitation actuated brake in which the generation of operating noise is suppressed with a simple configuration.

[0007]

In order to achieve such an object, the non-excitation actuated brake of the first invention is movable only in the axial direction on the magnetic pole side of a field core having an electromagnetic coil installed therein. An armature, a rotatable brake disc, and a side plate fixed to the field core are sequentially stacked, and the brake disc is braked by pressing the armature toward the side plate by the spring force of a braking spring. In the excitation brake, an inner driver fitted into the center hole of the brake disc is provided between the bearing fitted to the inner peripheral surface of the field core and the cover covered with the side plate. It is characterized by preventing falling off. In the non-excitation brake with the above configuration, the inner driver fitted in the center hole of the brake disc moves axially by the bearing fitted on the inner peripheral surface of the field core and the cover covered by the side plate. Is restricted, preventing the inner driver from falling out of the center hole of the brake disc.

The non-excitation actuated brake of the second invention is the first invention.
In the non-excitation actuated brake according to the invention, the cover is fixed to the side plate by a fastening member that fixes the side plate to the field core, and a vibration-proof sheet is sandwiched between the side plate and the cover. The non-excitation brake with the above structure does not require the structure in which the side plate is sandwiched between the two plates, and there is no need to attach the cover to the side plate afterwards. Is reduced, and the cost of the non-excitation actuated brake is reduced.

The non-excitation actuated brake of the third invention is the second invention.
In the non-excitation actuated brake according to the invention described above, the cover is provided with a disc portion overlaid on the side surface of the side plate and a cylindrical portion extending from the outer peripheral surface of the disc portion to the field core side. On the outer peripheral surface side of the portion, there is formed a recessed portion to be fastened in which a through hole through which the fastening member is inserted is formed. It is characterized in that an engaging groove to be fitted is formed. In the non-excitation brake having the above-described configuration, the compression allowance of the vibration isolating sheet is set by the protrusion amount of the fastened portion of the cover, so that the vibration isolating sheet can be easily incorporated.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The non-excitation actuated brake shown in FIGS. 1 to 3 will be described below as an embodiment of the present invention. FIG. 1 is a cross-sectional view of a non-excitation actuated brake mounted on a bracket of a motor. FIG. 2 is a plan view of the non-excitation operated brake. FIG. 3 is a plan view of the vibration damping sheet.

The non-excitation actuated brake 1 has a field core 3 fixed to a bracket of a motor 2 as a machine to be braked by screws. The field core 3 has an annular groove 3a that is open in the axial direction, a multi-winding electromagnetic coil 4 that is housed therein, and an opening-side end surface that is an annular magnetic pole surface 3b. Further, in the magnetic pole surface 3b on the outer side in the radial direction of the magnetic pole surface 3b of the field core 3, there are screw holes 3c formed at positions that divide the circumferential direction into three equal parts, and positions that similarly divide the circumferential direction into three equal parts. 3d is formed in the spring hole, and the magnetic pole surface 3b on the radially inner side is provided with an annular recess 3e. Further, a stepped inner peripheral surface 3f is formed in the center of the field core 3, and the bearing 11 is press-fitted into a portion of the inner peripheral surface 3f having a large inner diameter. The bearing 11 includes a rotating shaft 2 of the motor 2.
The tip of a is press-fitted.

On the side of the magnetic pole surface 3b of the field core 3 having such a shape, a disk-shaped side plate 5 having through holes 5a formed at positions dividing the circumferential direction into three equal parts is fixed screw 6a. Fastening means 6 composed of a (fastening member) and a collar 6b (gap adjusting member) 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 the screw 6 a 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.

Between the field core 3 and the side plate 5, there is provided a disc-shaped armature 7 having a through hole 7a at a position dividing the circumferential direction into three equal parts. In this armature 7, the collar 6b of the fastening means 6 for fixing the side plate 5 to the field core 3 has the through hole 7a.
Therefore, it is supported by the field core 3 so as to be movable only in the axial direction. Reference numeral 8 is a bush fixed to the through hole 7a of the armature 7 by press-fitting so as to prevent an unpleasant collision sound with the collar 6b and to allow the armature 7 to slide smoothly on the collar 6b.
Reference numeral 15 is a rubber O-ring fitted in the recess 3e of the field core 3 and sandwiched between the field core 3 and the armature 7. The O-ring 15 is provided in order to prevent the generation of attraction noise when the armature 7 is magnetically attracted to the field core 3.

A disc-shaped brake disc 9 is interposed between the side plate 5 and the armature 7 thus arranged on the field core 3. A substantially square center hole 9a is formed at the center of the brake disc 9, and an inner driver 10 having a substantially square cross section is integrally rotatably inserted and fitted into the center hole 9a. The inner driver 10 includes a rotary shaft 2 of the motor 2.
The brake disc 9 is attached to a by a key or the like so as to be integrally rotatable, and supports the brake disc 9 so as to be movable only in the axial direction.
In addition, the bearing 1 is provided on the side surface at one end of the inner driver 10.
An end portion 10a that contacts only one inner ring is formed.
Furthermore, on the outer peripheral surface at the other end of the inner driver 10, an arc portion 10b formed on a circle having a diameter smaller than the diagonal dimension is provided at a corner portion.

The side plate 5 is covered with a cover 12. The cover 12 includes a disc portion 12 a that is placed on the other side surface of the side plate 5 and the disc portion 12 a.
A concave portion to be fastened 12b formed at a position where the outer circumferential surface side of a is divided into three in the circumferential direction, a through hole 12c formed in the fastened portion 12b, and an outer circumferential surface of the disc portion 12a. From the cylindrical portion 12d extending from the field core 3 side to the disk portion 1
A center hole 12e is formed at the center of 2a. The diameter of the center hole 12e is smaller than the size of the diagonal line of the corner portion of the inner driver 10, and the peripheral surface faces the arc portion 10b. Further, a fixing screw 6a for fixing the side plate 5 to the field core 3 is inserted into the side plate 5 and the through holes 5a and 12c of the cover 12,
The side plate 5 and the cover 12 are integrally fixed to the field core 3.

The inner driver 10 is inserted from the side plate 5 side, fitted into the center hole 9a of the brake disc 9 until the end 10a abuts the inner ring of the bearing 11, and the side plate 5 is covered with the cover 12. By being crowned, the circular arc portion 10b is arranged so as to engage with the central 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 screw 6a, the inner driver 10 is restricted from moving in the axial direction by the bearing 11 and the cover 12.

Disc portion 1 of side plate 5 and cover 12
A flat plate-shaped vibration-proof sheet 13 is provided between the plate 2 and 2a. An engagement groove 13a that engages with the fastened portion 12b of the cover 12 is formed on the outer periphery of the vibration-proof sheet 13. Further, the vibration-proof sheet 13 is sandwiched between the side plate 5 and the cover 12 by integrally fixing the side plate 5 and the cover 12 with the fixing screw 6a.

Non-excitation actuated brake 1 having such a configuration
Fits the bearing 11 into the inner peripheral surface 3f of the field core 3 accommodating the electromagnetic coil 4 by press fitting, and the spring hole 3d.
The braking spring 14 is inserted into the recess 3e, and the O-ring 15 is inserted into the recess 3e.
After fitting, the armature 7 is overlaid on the magnetic pole surface 3b side. Further, the collar 6b is inserted into the through hole 7a of the armature 7 via the bush 8, and the brake disc 9 and the side plate 12 are sequentially stacked on the armature 7. Further, the end portion 10 a is brought into contact with the bearing 11 while fitting the inner driver 10 into the center hole 9 a of the brake disc 9. Furthermore, the circular arc portion 10b and the central hole 1 of the cover 12
2e while engaging with 2e and the fastened portion 1 of the cover 12
2b and the engaging groove 13a of the vibration-proof sheet 13 are engaged, the cover 12 is covered on the side plate 5, and the fixing screw 6
a is a through hole 12c, 5 for the cover 12 and the side plate 5
The assembly is completed by inserting a and the collar 6b and screwing them into the screw holes 3c of the field core 3. Further, 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 spring force of this braking spring 14 causes the brake disc 9 to move to the side plate 5 and the armature 7. It is pinched between. In the non-excitation actuated brake 1, the rotary shaft 2 a is inserted and fitted into the inner driver 10 and the bearing 11, and the field core 3 is attached to the bracket of the motor 2.

In the braking state as shown in the figure, if the electromagnetic coil 4 is energized to generate a magnetic flux, the braking spring 14
Since the armature 7 is magnetically attracted to the magnetic pole surface 3b of the field core 3 against the spring force of, the armature 7 is separated from the brake disc 9. Therefore, the braking of the brake disc 9 is released, and the rotary shaft 2a of the motor 2 becomes rotatable.

When the electromagnetic coil 4 is de-energized,
Due to the spring force of the braking spring 14, the brake disc 9 is frictionally engaged with the armature 7 and the side plate 5 and is retained by braking. During such braking, the anti-vibration sheet 1
3 is an uncomfortable collision sound generated when the armature 7 collides with the side plate 5 via the brake disc 9 due to the spring force of the braking spring 14, and the brake disc 9
Armature 7 and brake disc 9 until
Also, it suppresses generation of operating noise such as unpleasant engagement noise (squeaking noise) generated by frictional engagement between the brake disc 9 and the side plate 5.

[0021]

In the non-excitation actuated brake according to the first aspect of the present invention constructed as described above, the inner driver fitted in the center hole of the brake disc and the bearing fitted in the inner peripheral surface of the field core. Since the cover provided on the side plate restricts the movement in the axial direction, the inner driver is prevented from falling out of the center hole of the brake disc.

In the non-excitation brake of the second invention, the cover is fixed to the side plate by the fastening member for fixing the side plate to the field core, and the anti-vibration sheet is sandwiched between the side plate and the cover. There is no need for the side plate to have a structure in which an anti-vibration sheet is sandwiched between two plates, and there is no need to attach a cover to the side plate afterwards.
The number of assembling steps is reduced, and the non-excitation actuated brake can be made inexpensive.

In the non-excitation actuated brake of the third invention, a cover having a concave portion to be fastened to the disc portion and a vibration-proof sheet having an engagement groove are provided, and the vibration-proof sheet is engaged. Since the mating groove is arranged and assembled so as to engage with the fastened part of the cover, and the compression amount of the antivibration sheet is set by the projection amount of the fastened part, the antivibration sheet can be easily assembled. You can

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a non-excitation actuated brake attached to a bracket of a motor.

FIG. 2 is a plan view of a non-excitation actuated brake.

FIG. 3 is a plan view of a vibration-proof sheet.

[Explanation of symbols]

1 Non-excitation actuated brake 3 field core 5 Side plate 6 fastening means 6a Fixing screw (fastening member) 10 Inner driver 11 bearings 12 covers 13 Anti-vibration sheet

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3J058 AA43 AA48 AA53 AA68 AA78                       AA88 BA21 BA62 BA64 CC12                       CC72 CC77 CC84 CC98

Claims (3)

[Claims] 1. An armature movable only in the axial direction, a rotatable brake disc, and a side plate fixed to the field core are sequentially stacked on the magnetic pole surface side of a field core having an electromagnetic coil installed therein, and braking is performed. In a non-excitation actuated brake in which the brake disc is braked by pressing the armature toward the side plate side by the spring force of a spring, an inner driver fitted in the center hole of the brake disc is attached to the inner peripheral surface of the field core. A non-excitation brake that is provided between a bearing fitted to the base plate and a cover covered with a side plate to prevent the inner driver from falling off. 2. The non-excitation actuated brake according to claim 1, wherein the cover is fixed to the side plate by a fastening member that fixes the side plate to the field core, and a vibration-proof sheet is provided between the side plate and the cover. Non-excitation actuated brake characterized by being sandwiched. 3. The non-excitation actuated brake according to claim 2, wherein the cover has a disc portion that is overlaid on a side surface of the side plate, and the outer peripheral surface of the disc portion extends toward the field core side. A cylindrical portion is provided, and a concave portion to be fastened is formed on the outer peripheral surface side of the disc portion with a through hole through which a fastening member is inserted. The non-excitation actuated brake is characterized in that an engagement groove is formed which is engaged with a fastened portion of the cover.