JPS5932187Y2 - Electromagnetic clearance adjustment device for electric motor with brake - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention is an electric motor with a rotating friction disk braking system brake, in which the gap between the friction disk and the mating friction surface, which wears out with increasing number of braking operations, can be easily adjusted. This invention relates to an electromagnetic gap adjustment device for an electric motor with a brake.

[Technical background of the invention and its problems]

Figure 1 is a front view of the upper half of a conventional rotary friction disc braking type electric motor with a brake. In the figure, 1 is the stator of the electric motor, 2 is the rotor of the electric motor, 3 is the rotating shaft, and 4 is the rotating shaft and a polygonal boss that connects the friction disk I and transmits braking force,
Reference numeral 5 denotes a bearing bracket, which has a friction surface 6 with a friction disk 7 on one side.

The brake shoe 10 integrated with the movable iron core 9 is the fixed iron core of the electromagnet fixed to the electromagnet fixed end plate 19, a is the friction surface 6 and the friction disk 7, and b is the friction disk I and the brake shoe 8. , C indicates a gap between the movable core 9 and the fixed core 10, and 10a is an electromagnetic coil wound around the fixed core 10, which together with the movable core 9 forms an electromagnet.

In such an electric motor with a brake, when the power is turned on now.

A current flows through the electromagnetic coil 10a and the fixed iron core 10 of the electromagnet
A magnetic attraction force acts against the spring 11 to pull the movable iron core 9, the gap C becomes zero, the gaps a and b are opened, and the friction disk 7 is able to rotate freely.

That is, the rotating shaft 3 can freely rotate. Next, when the power is cut off, the magnetic attraction force of the electromagnet disappears, and the brake shoe 8
The spring 11 provided between the fixed end plate 19 of the electromagnet and the fixed end plate 19 of the electromagnet is expanded, and the movable iron core 9 and the brake shoe 8 are pushed in the direction of the rotation axis, and the friction disk 7 is pressed against the friction surface 6 of the bearing bracket 5. The rotating shaft 3 of the electric motor is braked.

From this point of view, generally speaking, as the friction disk 7, a material mainly composed of asbestos-containing synthetic resin is used, which has a high coefficient of friction and is softer and more abrasive than metals such as the brake shoes 8 and the friction surface 6 of the bearing bracket 5. There is.

Incidentally, in the above, the friction disk 7 wears out with the number of braking operations, and therefore the gaps at various places, that is, the gap a between the friction surface 6 and the friction disk 7, and the gap between the friction disk 7 and the brake shoe 8. b. Due to the gaps a and b, the gap C between the movable iron core 9 and the fixed iron core 10 increases with the number of braking operations.

Here, the gap C is the gap when the brake shoe 8 is pressed by the spring 11 toward the friction surface 6 of the bearing bracket 5 and the gaps a and b become zero when the power is not turned on, that is, during braking. It is.

When the friction disk 7 wears out, when the gap C is zero, a
The gap between and b becomes larger than the gap before the friction disk T wears out.

Therefore, due to wear of the friction disk 7, the above-mentioned gap C becomes larger during braking by the amount of wear.

As a result, gaps a and b become larger. During braking due to the pressing force of the spring 11, the impact force of the brake shoe 8 on the friction disk 7 suddenly increases, and there is a risk of damage to various parts, and if the gap C becomes large, the electromagnetic coil 10a will generate a magnetic attraction force. The excitation current for tightening becomes excessive, causing problems such as overheating, burnout, and inability to release the brake due to inability to attract the brake.

For this reason, it is necessary to adjust the gaps a, b, and c so that they are always within a certain range from beginning to end, and a mechanism for this must be considered.

In view of the above, conventionally, as shown in FIG. By screwing in and tightening through the plate 19, the position of the fixed core 10 of the electromagnet attached to the electromagnet fixed end plate 19 is adjusted, and the gap a,
This allows b and C to be reduced as appropriate.

Note that a nut 1 is attached to the other threaded portion of the special bolt 14.
Two pieces 5 are attached to fasten the electromagnet fixed end plate 19 to prevent loosening.

In addition, generally three to four special bolts 14 are used,
It has the function of supporting the fixed side electromagnet 10 and at the same time supporting the impact force when the movable iron core 9 is attracted and the repulsive force of the spring 11.

However, in such a conventional clearance adjustment mechanism, the special bolt 14 used therein must be specially manufactured and is generally difficult to obtain, and the adjustment mechanism is expensive. and
There has been a drawback that the threaded portion is damaged by impact force due to the screwing play between the screw hole 13 and the threaded portion of the special bolt 14, resulting in a shortened service life.

[Purpose of invention]

This invention was developed to solve the above problems, and its purpose is to use ordinary hexagon head bolts and nuts commonly available on the market for positioning and fixing the fixed core, and It is an object of the present invention to provide an electromagnet gap adjustment device for an electric motor with a brake that is inexpensive and highly reliable, by employing a second spring, so that the gap between the electromagnets can be easily and reliably adjusted.

[Summary of the idea]

In order to achieve the above object, in the present invention, a hexagonal head bolt is screwed through the electromagnet fixed end plate in the direction of the rotation axis into the screw hole of the brake frame fixed to the bearing bracket of the electric motor with a brake. For preventing the hexagonal head bolt from turning, one end is bent between the head bolt and the electromagnet fixing end plate, and the other end is bent along the bolt head, and the claw of the other end is inserted into the small hole made in the electromagnet fixing end plate. A washer with a claw is provided, a hexagonal nut is screwed in the middle of the threaded part of this hexagonal head bolt to tighten the electromagnet fixed end plate, and a second spring is installed between the brake frame and the hexagonal nut. It is characterized in that it prevents the hexagonal nut from loosening and reduces the impact force, thereby preventing damage to the screw.

[Example of idea]

An embodiment of the present invention shown in FIGS. 2 and 3 will be described.

FIG. 2 is an enlarged cross-sectional view of a main part of an electromagnetic gap adjusting device for an electric motor with a brake according to the present invention.

Note that the same parts as those in the prior art described above are given the same reference numerals, and detailed explanations will be omitted.

In the present invention, the position of the fixed core 10 can be adjusted and determined using a commercially available JIS standard hexagonal nut 16 and a hexagonal headed pole N7 (generally made of chrome molybdenum steel).

The structure of the fixed parts such as the electromagnet fixed end plate 19 includes a hole in the electromagnet fixed end plate 19 through which the hexagon head bolt 1T is inserted, and a small hole 21 into which the claw 22 of the claw washer 18 is inserted nearby.

Insert the claw washer 18 into the hexagonal head bolt 17 in advance, insert it into the electromagnet fixed end plate 19, and then tighten the hexagonal nut 16.
After screwing on the washer 24 and the second spring, the conical spring,
23 and tighten into the screw hole 13 of the brake frame 12.

The claw washer 18 prevents the hexagonal head bolt 17 from rotating.
The hexagonal nut 16 tightens the electromagnet fixed end plate 19 to prevent the hexagonal head bolt 17 from loosening. The conical spring 23 prevents the hexagonal nut 16 from loosening and the screw hole 13 and the hexagonal head bolt 17.
This prevents damage by alleviating the impact force with the threaded part.

To position the electromagnet fixed end plate 19, etc., first use the claw washer 18.
Insert the claw 22 into the small hole 21 of the electromagnet fixed end plate 19, insert the feeler gauge into the gap C between the fixed core 10 and the movable core 90, turn the hexagon head bolt 17 to adjust the gap C to the normal value, and then Tighten the nut 16, then the claw washer 1
Bend the bent end 20 of 8 and attach the hexagonal head bolt 170.
Run along your head.

FIG. 3 is a plan view of the main part of the hexagonal head bolt to prevent it from turning. The claw washer 18 locks the hexagonal head bolt 17 at the bent end 20 and the electromagnet fixed end plate 19 at the claw 22. The hexagonal head bolt 17 will not loosen unless the hexagonal nut 16 loosens and the claw 22 of the claw washer 18 comes out of the small hole 21 of the electromagnet fixed end plate 19.

Note that the bent end 20 can be easily bent back with a tool.

Furthermore, the impact force that the fixed core 10 receives due to the collision of the movable core 9 is transmitted to the hexagonal head bolt 1 via the electromagnet fixed end plate 19.
7, the threaded part of the hexagonal head bolt 17 and the threaded hole 13 of the brake frame 12 receive impact force, so the impact caused by multiple operations could cause looseness between the screws and damage them. , brake frame 12 and hexagonal nut 16
A conical spring 23 is provided as a second spring with a washer 24 interposed therebetween, and the conical spring 23 absorbs the impact, thereby preventing damage.

Further, since the conical spring 23 always presses the hexagonal nut 16, it also prevents the hexagonal nut 16 from loosening.

Here, the washer 24 is inserted so that the hexagonal nut 16 pressed by the conical spring 23 can be easily turned.

Therefore, according to the configuration of the present invention, loosen the hexagonal nut 16 and insert the hexagonal head bolt 17 into the screw hole 13 of the brake frame 12.
By screwing in, the gap C between the movable core 9 and the fixed core 10 can be easily adjusted.

Further, the conical spring 23 eliminates mutual rattling between the threaded portion of the hexagonal head bolt 17 and the threaded hole 13 of the brake frame 12, thereby reducing the impact force.

In addition, the hexagonal head bolt 17 and hexagonal nut 16 do not loosen even with the strong impact force peculiar to the brake function, and in particular, when a conical spring 23 is used as the second spring, the thickness when compressed is small due to the shape of the conical spring. Since the axial length) is small, the gap can be continuously adjusted over a wide range from the thickness at the time of expansion to the time of maximum compression, and can be done reliably.

Furthermore, since the main parts, such as the hexagonal head bolt 17 and hexagonal nut 16, can be easily obtained commercially, maintenance is easy.

[Effect of idea]

As described above, according to the present invention, the structure is simple and adjustment is easy.
Reliability has been improved because the impact force that is applied due to loosening of hexagonal head bolts and hexagonal nuts that require adjustment during maintenance and the braking action can be alleviated, and there is no damage.

Furthermore, since commercially available hexagonal head bolts and hexagonal nuts can be used for the main parts, it is possible to provide an electromagnetic gap adjustment device for an electric motor with a brake that is easy to obtain and maintain and is inexpensive.

[Brief explanation of the drawing]

Figure 1 is a front view with the upper half of a conventional electric motor with a brake cut away.
FIG. 2 is an enlarged cross-sectional view of the main part of the electromagnetic gap adjustment device for an electric motor with a brake according to the present invention, and FIG. 3 is a plan view of the main part of the hexagon head bolt for preventing rotation. 3...Rotation axis, 4...Polygonal boss of rotation axis, 5...
・Bearing bracket, 6...Friction surface, 7...Friction disk, 8...Brake shoe, 9...-Movable iron core, 10...
・Fixed iron core. 10a... Electromagnetic coil, 11... Spring, 12...
Brake frame, 13...-screw hole, 16...hexagonal nut, 17...hexagonal head bolt, 18...-claw washer, 19...electromagnet fixed end plate, 20...claw washer 21... Small hole of the washer with a claw, 22... The claw of the washer with a claw. 23... Conical spring, 24... Washer, a, b, c.
··gap.

Claims (1)

[Scope of utility model registration request] When the power is turned on, the movable iron core is attracted by the magnetic attraction force acting on the fixed iron core of the electromagnet installed on the fixed end plate of the electromagnet, making the friction disk attached to the rotating shaft of the motor rotatable, and when the power is turned off, the first spring In the electric motor with a brake, the rotary shaft of the electric motor is braked by pushing the movable iron core and the brake shoe integrated therewith in the direction of the rotating shaft and pressing the friction disk between the friction surface of the bearing bracket and the hexagonal head bolt. The electromagnet fixed end plate is provided with a washer with a claw that is bent at one end so as to fit along the bolt head, and the claw portion of the other end is inserted into a hole formed in the electromagnet fixed end plate to prevent rotation. A hexagonal nut for tightening the electromagnet fixed end plate is screwed into the threaded part of the hexagonal head bolt, and a second spring is inserted, and then the brake frame screw fixed to the bearing bracket is inserted. An electromagnetic gap adjustment device for an electric motor with a brake, characterized by screwing into a hole.