JPH053668U - Electromagnetic brake gear adjustment device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an automatic gap adjusting device having a simple structure in an electromagnetic brake. [Structure] The movable core 6 is a rotary plate 6a near the fixed core 11
And a wear plate 6b near the brake wheel 3 so that the rotary plate 6a can be rotated by the brake spring 10, and the depth adjacent to either of the plate facing surfaces in the rotation direction is different. A pair of grooves 21a, 21b
On the other hand, when the rotary plate 6a is rotated, the protrusion 22 that can switch and fit the grooves 21a and 21b from the deep side to the shallow side to increase the total thickness of the movable core 6 is provided.
Formed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a gap automatic adjustment device for an electromagnetic brake used in a hoisting device for an electric hoist.

[0002]

[Prior Art]

 An electric hoist is a transportation device for loading and unloading or transferring luggage in a factory, for example. This electric hoist hoisting device (hoist body) consists of a drive unit that has a hoisting motor, a rotating drum around which a wire rope is wound, and a reduction gear that transmits the driving force of the hoisting motor to the rotating drum. And a drive unit having an electromagnetic brake.

FIG. 5 shows a general electromagnetic brake. As shown in the figure, a motor pinion 2 drivingly connected to a hoisting motor (not shown) is rotatably supported at the center of the electromagnetic brake body 1. Two brake wheels 3 are integrally mounted on the motor pinion 2 so as to be rotatable and axially movable.

Further, the electromagnetic brake main body 1 and the support plate 4 are provided with three guide pins 5 (one shown in the drawing) whose both ends are fixedly connected. A movable core 6, a brake disc 7, and a holding plate 8 are attached to each guide pin 5 so as to be movable in the axial direction. At this time, the brake disc 7 is located between the two brake wheels 3, and the brake lining 9 is interposed between the movable core 6 and the brake wheel 3, the brake disc 7, and the holding plate 8.

A brake spring 10 is mounted between the main body 1 and the movable core 6. As a result, the movable core 6 is pressed toward the brake wheel 3, so that the movable core 6 and the brake wheel 3, the brake disc 7, the presser plate 8 and the brake lining 9 come into close contact with each other.

A fixed core 11 is integrally formed with the main body 1, and an electromagnetic coil 12 is attached to the fixed core 11. Therefore, by energizing the electromagnetic coil 12, the movable core 6 can be attracted, and the contact between the movable core 6, brake wheel 3, brake disc 7, presser plate 8 and brake lining 9 can be released. ing.

An adjustment nut 13 is screwed onto the support plate 4, and the adjustment nut 13 moves the pressing plate 8 to adjust the adhesion force between the brake wheel 3 and the brake disc 7. it can. A cover 14 is attached to the main body 1 to cover the entire electromagnetic brake.

When the hoisting motor is energized during operation of the hoist, the motor pinion 2 rotates, and the rotary drum rotates through a reduction gear mechanism (not shown) to feed or draw the wire rope.

During this operation, the electromagnetic brake is also energized, the electromagnetic coil 12 attracts the movable core 6, and the contact between the movable core 6 and the brake wheel 3, brake disc 7, presser plate 8, and brake lining 9 is released. It Therefore, the urging force of the brake spring 10 does not act on the brake lining 9, and the brake wheel 3, that is, the motor pinion 2 can freely rotate.

On the other hand, the hoisting motor stops, and the feeding or feeding of the wire rope by the rotating drum stops. At the same time, the current to the electromagnetic brake is also cut off, and the attraction of the movable core 6 by the electromagnetic coil 12 is stopped. Then, the movable core 6 is pressed toward the brake wheel 3 side by the brake spring 10, and the movable core 6 and the brake wheel 3, the brake disc 7, the presser plate 8 and the brake lining 9 come into close contact with each other to brake the brake wheel 3.

[0011]

[Problems to be solved by the device]

 In the aforementioned electromagnetic brake, the brake lining 9 is gradually worn by its use, and the brake gap δ set between the fixed core 11 and the movable core 6 is gradually increased.

Therefore, the adjustment of the brake gap δ has conventionally been performed manually by the adjustment nut 13. There was also an automatic gap adjusting device, but this had the problem that the number of parts was large and the structure was complicated, which resulted in a significant increase in cost.

Therefore, an object of the present invention is to provide a gap automatic adjustment device having a simple structure.

[0014]

[Means for Solving the Problems]

 In order to achieve the above object, the structure of the present invention is an electromagnetic brake in which an electromagnetic coil attracts a movable core to a fixed core side against a brake spring force so that a brake wheel is free from a brake disc. The movable core is divided into a movable core rotary plate near the fixed core and a movable core friction plate near the brake wheel so that the movable core rotary plate can be rotated in a predetermined direction by a predetermined angle by an urging means. On one of the facing surfaces of the movable core rotating plate and the movable core friction plate, a pair of fitting recesses adjacent to each other in the rotating direction and having different depths are provided at a plurality of positions in the circumferential direction, and on the other side. When the movable core rotating plate is rotated, a plurality of fitting protrusions are formed in the circumferential direction that can switch the fitting recesses from the deep side to the shallow side to increase the total thickness of the movable core. This The features.

[0015]

[Action]

 According to the above configuration, when the brake gap exceeds the set adjustment limit, the movable core rotating plate rotates in the direction in which the total thickness of the movable core increases with respect to the movable core friction plate, which allows the initial adjustment of the brake gap. The value is automatically adjusted.

[0016]

【Example】

 An embodiment of the present invention will be described below with reference to the accompanying drawings. 1 to 4 show an electromagnetic brake according to an embodiment of the present invention. In these figures, members having the same functions as those shown in FIG. 5 are designated by the same reference numerals, and a duplicate description will be omitted.

An automatic gap adjusting device is attached to the electromagnetic brake of this embodiment. That is, as shown in the figure, the movable core 6 is divided into a movable core rotary plate 6a near the fixed core and a movable core friction plate 6b near the brake wheel, and the movable core friction plate 6b is attached to the three guide pins 5. Is non-rotatably fitted in the round hole 20b, and the movable core rotating plate 6a is fitted in the oblong hole 20a so as to be rotatable (about 15 ° in rotation angle).

Then, on the surface of the movable core rotary plate 6a facing the movable core friction plate 6b, there is a shallow groove 21a of, for example, 0.75 mm extending in the radial direction, and a shallow groove 21a, for example, 1. The deep groove 21b of 75 mm forms a pair and is formed at a plurality of locations (three locations in the figure) in the circumferential direction. On the other hand, on the movable core friction plate 6b side, there are provided a plurality of protrusions 22 in the circumferential direction which can be selectively fitted into the both grooves 21a and 21b (in the drawing, the positions where the both grooves 21a and 21b are formed). Is formed at three locations).

Further, a part of the outer periphery of the movable core friction plate 6 b is cut out, and the first bolt 24 a screwed to the movable core rotating plate 6 a by utilizing the cutout portion 23 and the cutout portion 2. 3, a rotation spring 25 for constantly urging the movable core rotating plate 6a in a predetermined rotation direction is provided between the movable core rotating plate 6a and a second bolt 24b screwed to the movable core friction plate 6b. It

In other configurations, the support plate 4 and the pressing plate 8 (see FIG. 5) are eliminated, and a relatively large adjustment nut 13 is screwed onto the tip of the motor pinion 2, and the brake spring 10 is guided. It is the same as the conventional example shown in FIG. 5, except that the pin 5 is replaced with the inside of the fixed core 11.

With such a configuration, with the protrusion 22 of the movable core friction plate 6b fitted in the deep groove 21b of the movable core rotation plate 6a (see FIG. 4), the brake gap is adjusted by the adjusting nut 13 to, for example, The electromagnetic brake is used after the initial adjustment value of 0.75 mm is set.

When the brake lining 9 is worn little by little and the brake gap is gradually increased by use and exceeds the set adjustment limit (1.75 mm in this embodiment), the movable core is rotated when the brake is released. The plate 6a is rotated by about 15 ° (which is determined by the slot 20a) in the direction of the arrow in the drawing by the rotating spring 25, and the projection 22 is switchably fitted into the shallow groove 21a of the movable core rotating plate 6a. ..

As a result, the total thickness of the two movable cores 6a and 6b becomes 1 mm (1.75 mm-0.75 mm) thick in the present embodiment, and the brake gap becomes the initial setting value of 0.75 mm, which is only once. It is automatically adjusted.

It should be noted that the present invention is not limited to the above-described embodiment, and the positional relationship between the two grooves 21a and 21b and the protrusion 22 between the two movable cores 6a and 6b is within a range not departing from the gist of the present invention. It is needless to say that various changes such as forming by reversing are possible.

[0025]

[Effect of the device]

 As described above, according to the present invention, the movable core is divided into two parts to provide the automatic gap adjusting function, so that the automatic gap adjusting device having a small number of parts and a simple structure is realized.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an electromagnetic brake showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a side view of a main part of a movable core.

FIG. 5 is a sectional view of a conventional example.

[Explanation of symbols]

 3 Brake Wheel 5 Guide Pin 6 Movable Core 6a Movable Core Rotating Plate 6b Movable Core Friction Plate 7 Brake Disc 10 Brake Spring 11 Fixed Core 12 Electromagnetic Coil 20a Long Hole 20b Round Hole 21a Shallow Groove 21b Deep Groove 22 Projection 25 Rotation Spring

Claims (1)

[Claims for utility model registration] [Claim 1] In an electromagnetic brake in which a brake wheel is free from a brake disc by an electromagnetic coil attracting a movable core to a fixed core side against a brake spring force, The movable core is divided into a movable core rotary plate near the fixed core and a movable core friction plate near the brake wheel, and the movable core rotary plate is rotatable by a biasing means in a predetermined direction by a predetermined angle. A pair of fitting recesses adjacent to each other in the rotation direction and having different depths are provided at a plurality of circumferential positions on either one of the facing surfaces of the plate and the movable core friction plate, and on the other side, the movable core rotation When the plate rotates, a plurality of fitting protrusions are formed in the circumferential direction, which can be fitted to the fitting recess by switching from deeper to shallower to increase the total thickness of the movable core. Gap automatic adjusting apparatus of the electromagnetic brake that.