JPH0529548Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a mounting structure for attaching an electromagnetic brake unit to the rotating shaft of a mass-produced ready-made motor to convert it into a brake motor.

(Prior Art) Fig. 2 shows the structure of the end of a ready-made motor on the opposite load side.A rotary shaft 3 is attached to the inner circumferential side of an end bracket 2A, which is attached to a housing 1 whose outer circumferential side is drum-shaped. A bearing 7 is attached to the rotary shaft 3, and a fan 4A is attached to the rotary shaft 3, and a fan cover 6 is attached to the outside of the fan 4A.

When converting this ready-made motor into a brake motor, first remove the end bracket 2A including the bearing 7, the fan 4A, and the fan cover 6. Then, as shown in FIG. 3, a new end bracket 2B, which is compatible with the end bracket 2A, has a stator 2X bolted to its end face, and a bearing 7 attached to its inner circumferential side is attached to the housing 1, and An extended rotation shaft 3X is added to the rotation shaft 3, and this extension rotation shaft 3X
An armature hub 4X is fixed to the outer periphery of the armature hub 4X.

In addition, after installing the removed fan 4A at the end of the extended rotation shaft 3X, a new fan cover 6 is installed.
Apply X. The stator 2X has a built-in excitation coil 8, a lining 9 is attached to the end of the stator 2X on the armature hub 4X side, and an armature 5X is attached to the armature hub 4X via a leaf spring 10, and the lining A minute gap G is formed between the armature 9 and the armature 5X.

Therefore, when the excitation coil 8 is energized, an excitation circuit is formed between it and the armature hub 4X,
Since the armature 5X is attracted to the lining 9 against the spring force of the leaf spring 10, a brake is applied to the rotating shaft 3 of the motor.

Furthermore, recently, in order to reduce weight and cost through mass production, end brackets that were conventionally made of cast metal have come to be made of press-formed sheet metal. The end bracket has a bulge in the center, which accommodates a bearing that is attached to the motor body and rotatably supports the rotating shaft.

(Problem to be solved by the invention) However, in the conventional mounting structure described above, the above-mentioned minute gap (gap) occurs due to the following factors.
It is difficult to maintain G accurately, and the desired brake operation cannot be easily obtained.

The stator 2X side and armature hub 4X
Since the sides are mounted separately, it is difficult to obtain positioning accuracy.

In a ready-made motor, the end bracket 2A is attached to the outer periphery of the rotating shaft 3 so that the motor body including the end bracket 2A and the drum 1 can slide slightly in the axial direction of the rotating shaft 3.
A play dimension is provided between the stator 2X and the bearing 7, and due to this play dimension, the gap G cannot be secured if the stator 2X is directly attached to the new end bracket 2B as described above.

In order to correct the above, a gap adjusting plate such as a wave washer is inserted between the end bracket 2A and the bearing 7 to eliminate the play, but minute adjustments cannot be made.

Furthermore, the shape of the end bracket differs depending on the manufacturer, model, etc., and it is uneconomical to manufacture press-processed replacement end brackets for the relatively few modified brake motors.

Moreover, when the brake unit is attached to the rotary shaft protruding from the distal end of the bulged end bracket as described above, the overall shape becomes large.

Therefore, an object of the present invention is to provide a brake unit mounting structure that can solve the above-mentioned conventional problems.

(Means for Solving the Problems) The gist of the present invention is to provide a stator with a built-in excitation coil and a lining provided on the front surface, and whose inner peripheral side is in sliding contact with a sleeve via a bearing;
An armature facing the lining at a predetermined distance is attached via a spring, and an armature hub whose inner circumferential side is fixed to the sleeve allows the armature to be attached to the lining by the magnetic force generated from the excitation coil. An integrated brake unit that is attracted is constituted, and the sleeve is integrally formed with a large diameter cylindrical part to which the stator side is attached and a small diameter cylindrical part to which the armature hub side is attached, and the large diameter cylindrical part is attached to the motor body side. The bearing is loosely fitted onto the outer periphery of the bulging part of the end bracket in which the bearing is accommodated, and the stator side mounted on the large diameter cylindrical part is locked to the end bracket side via a rotation prevention means, and the small diameter The cylindrical portion has a brake unit mounting structure in which the small-diameter cylindrical portion, the rotary shaft, and the armature hub side are fixed by screw means by fitting the rotary shaft protruding from the end bracket.

(Example) The present invention will be explained below based on the illustrated example. First, FIG. 1 is a diagram showing the mounting structure of a brake unit according to an embodiment of the present invention.

There is a rotating shaft 1 on the end of the off-load side of the ready-made motor.
A bearing 12 whose inner circumferential side is in sliding contact with the motor body 1 is mounted, and the outer circumferential side of the bearing 12 is supported on the inner circumferential side of an end bracket 14 attached to a drum-shaped housing 13 on the side of the motor body. This end bracket 14 is formed by pressing a sheet metal, and in the case of a ready-made motor, it is screwed onto a threaded shaft 15 that projects from the housing 13 side and is inserted through the end bracket 14 with a nut 16. This end bracket 14 can be used as is, and the rotating shaft 11
The fan of the ready-made motor attached to the motor is removed and a brake unit A is attached in its place, and a fan cover 17 is attached to the outside of the brake unit A.

The brake unit A is integrally assembled with a sleeve 18, and the sleeve 18 has a large diameter cylindrical portion 18 that loosely fits around the central bulge 14a of the end bracket 14 in which the bearing 12 is accommodated.
a, and a small-diameter cylindrical portion 18b that is fitted onto the outer periphery of the end portion of the rotating shaft 11. This brake unit A, like a general electromagnetic brake, has an excitation coil 21 built-in and a lining 22 on the front part.
and an armature 26 which is attached to the inner surface of an armature hub 24 via a leaf spring 25 and faces the lining 22 with a predetermined gap therebetween.

The stator 23 is attached in advance to the large-diameter cylindrical portion 18a of the sleeve 18, but the large-diameter cylindrical portion 1
A needle bearing 27 is interposed between the outer periphery of the stator 8a and the inner periphery of the stator 23 so that they can come into sliding contact. Further, on the back side of the stator 23, there is a U-shaped locking groove 28a into which the screw shaft 15 is inserted.
A rotation prevention plate 28 having a tip formed at the tip thereof is attached in advance by screwing, and rotation of the stator 23 is prevented by the rotation prevention plate 29.

This sleeve 18 has a semicircular notch 1 on its outer periphery.
The small diameter cylindrical portion 1 is attached to the end of the rotating shaft 11 provided with the small diameter cylindrical portion 1a.
8b is fitted, and the rotating shaft 11 is inserted through a screw hole 18c drilled in the small diameter cylindrical portion 18b in a direction orthogonal to the axis.
mounted on. Thereafter, the armature hub 24 to which the armature 26 is attached in advance is attached to the small diameter cylindrical portion 18 of the sleeve 18 via the leaf spring 25.
The armature hub 24 is secured to the armature hub 24 by a bolt 19 that is fitted into the small diameter cylindrical portion
to prevent it from moving in the axial direction.

Note that a shim 20 is inserted between the armature hub 24 and the shoulder where the small diameter cylindrical portion 18b and the large diameter cylindrical portion 18a of the sleeve 18 are joined, so that a predetermined gap is obtained between the lining 22 and the armature 26. Make adjustments. Further, the leaf springs 25 are alternately connected to the armature hub 24 and the armature 26 via rivets or the like in a circumferential manner, and although not shown, the armature hub 2
A fan is attached to the side of No. 4 opposite to the armature 26 side.

As in the embodiment described above, the brake unit assembled integrally with the sleeve 18 is attached to the end of the rotary shaft 11 on the anti-load side of the ready-made motor with the end bracket 14 left as it is, and As in the example, it can be made to function as a brake motor that can perform brake operations on ready-made motors. In this case, even if the rotating shaft 11 moves in the axial direction, the gap between the armature 26 and the lining 22, which are assembled to the sleeve 18, is maintained constant, so that there is no problem in the operation of the electromagnetic brake. Never.

(Effects of the invention) As is clear from the above-mentioned embodiments, in the present invention, the end bracket used in the ready-made motor can be used as is, so there is no need to remove it or manufacture a new end bracket, making it economical. . Further, since the large diameter cylindrical portion of the sleeve to which the stator side of the brake unit is attached is loosely fitted into the bulge portion on the motor side, the shape can be reduced. Furthermore, it is easy to maintain a constant gap, which is extremely important for the operation of the electromagnetic brake.

[Brief explanation of the drawing]

Fig. 1 is an overall vertical cross-sectional view showing the mounting structure of a brake unit according to an embodiment of the present invention, Fig. 2 is a partial cross-sectional view of the opposite end side of a ready-made motor according to a conventional example, and Fig. 3 is a conventional example. FIG. 3 is a partial vertical cross-sectional view showing the mounting structure of the brake unit according to FIG. Explanation of symbols: 11...rotating shaft, 11a...notch, 12...bearing, 13...housing, 14...end bracket, 14a...bulge, 15...screw shaft, 16...nut, , 17...
...Fan cover, 18...Sleeve, 18a...
Large diameter cylinder part, 18b...Small diameter cylinder part, 18c...Screw hole, 19...Bolt, 20...Shim, 21...Excitation coil, 22...Lining, 23...Stator, 24...Armor hub, 25 ...plate spring,
26... Armour, 27... Needle bearing, 28... Stopping plate, 28a... Locking groove, A
...brake unit.

Claims (1)

[Scope of utility model registration request] A stator has a built-in excitation coil and is provided with a lining on the front surface, and the inner circumferential side of the stator is in sliding contact with the sleeve via a bearing, and an armature that faces the lining with a predetermined gap is attached via a spring. In addition, an armature hub whose inner circumferential side is fixed to the sleeve constitutes an integrated brake unit in which the armature is attracted to the lining by the magnetic force generated from the excitation coil, and the sleeve is attached to the armature hub on which the stator side is attached. integrally formed with a diameter cylindrical portion and a small diameter cylindrical portion to which the armature hub side is attached,
The large-diameter cylindrical portion is loosely fitted onto the outer periphery of the bulge of the end bracket in which the bearing on the motor body side is accommodated, and the stator side mounted on the large-diameter cylindrical portion is connected to the end bracket side with rotation prevention means. The small-diameter cylindrical portion is fitted onto a rotating shaft protruding from an end bracket, and the small-diameter cylindrical portion, the rotating shaft, and the armature hub side are fixed by screw means. Brake unit mounting structure.