JPH09100850A - Non-excitation type electromagnetic brake - Google Patents

Abstract

(57) [Summary] [Problem] Assembly work is complicated and productivity is poor. SOLUTION: A pressure receiving plate 6 and an adjusting plate 7 are overlapped with each other,
The annular groove 8 into which the stopper member 9 is fitted is formed by temporarily fixing with a bolt that is inserted from the through hole 7b and screwed into the screw hole 6c.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to automatic adjustment of a gap formed between a field core and an armature of a non-excitation actuated electromagnetic brake.

[0002]

2. Description of the Related Art In conventional non-excitation actuated electromagnetic brakes, for example, as proposed in Japanese Utility Model Publication No. 53-8836, a gap between a field core and an armature, which increases due to wear of a brake disc, is automatically provided. The structure is adjusted. That is, a conventional non-excitation actuated electromagnetic brake is engaged with a field core fixed to the housing of a device to be braked such as a motor and a plurality of guide pins fixed to the magnetic pole surface of the field core, and the axial direction Formed on the outer circumference of the field core, and the armature and pressure receiving plate that are allowed to move to the A cup member that is screwed into the thread groove and whose position is freely adjusted; and a braking spring member that is disposed on the field core side and presses the armature toward the cup member side.

Further, the other end of the connecting pin, which has one end screwed into a screw hole of an armature and fixed, is inserted into a through hole formed in the pressure receiving plate, and the tip thereof is fixed to the pressure receiving plate. The slider with which the engaging member abuts is press-fitted. Furthermore, a separating spring member interposed between the armature and the pressure receiving plate is fitted around the connecting pin. Further, a stopper member biased toward the center side by the adjusting spring member is interposed between the inclined groove formed on the outer side surface of the pressure receiving plate and the inner side surface of the cup member.

The non-excitation actuated electromagnetic brake having such a structure is sandwiched between the armature and the pressure receiving plate by the spring force of the braking spring member in a non-excitation state in which the electromagnetic coil provided in the field core is not energized. Since the brake disc that has been braked is held stationary after being braked, the rotating shaft of the braked device on which the brake disc is mounted is also held stationary. Further, when the electromagnetic coil is energized, the armature is magnetically attracted to the field core against the spring force of the braking spring member, so that the brake disc is released from the restraint and becomes rotatable. Then, the rotation shaft of the braked device is also rotatable.

On the other hand, if the brake disc is worn and the air gap between the armature and the field core in the non-excited state increases due to the repetition of such operations, the increased state changes the excited state into the non-excited state. Since the movement amount of the armature at the time of switching is increased, the press-fitting position of the slider, which is prevented from moving toward the cup member side by the engaging member, to the connecting pin moves toward the pressure receiving plate side by the increased amount. Further, when the armature is magnetically attracted to the field core by switching from the non-excitation state to the excitation state, the slider is hit by the pressure receiving plate, and the pressure receiving plate is pulled toward the field core side by the increased amount. Then, the stopper member bites between the pressure receiving plate and the cup member, and the movement of the pressure receiving plate toward the cup member side is blocked.

[0006]

In the conventional non-excitation actuated electromagnetic brake, the cup member is screwed onto the field core while the positions of a plurality of stopper members arranged at intervals in the circumferential direction are adjusted. Since the gaps are adjusted together and the spring member for urging the stopper member toward the center of the pressure receiving plate is incorporated, the assembling work becomes complicated and the productivity is poor. The present invention provides a non-excitation actuated electromagnetic brake that is easily assembled.

[0007]

A non-excitation actuated electromagnetic brake according to the present invention includes a field core having an electromagnetic coil provided therein and a magnetic pole surface fixed to the field core and spaced apart in the circumferential direction. A plurality of guide pins, and the guide pins are supported by being allowed to move in the axial direction,
An armature facing the magnetic pole surface of the field core with a gap of a predetermined width, and a pressure receiving plate facing the armature via a brake disc and supported by the guide pin while being allowed to move in the axial direction. An annular groove formed by an adjusting plate, which is overlapped with the pressure receiving plate and fixed to the tip of the guide pin, and the pressure receiving plate and the adjusting plate, and whose groove width is widened toward the radially outer opening. When,
A stopper member fitted in the annular groove and biting between the pressure receiving plate and the adjusting plate, and having a thin wall thickness toward the inner side in the radial direction, and movement of the pressure receiving plate due to the force of the stopper member. The armature and the pressure receiving plate are connected to each other by a slider arranged on the guide pin to limit the pressure, and the pressure receiving plate is moved by the movement of the armature by the increased amount when the gap increases. It is characterized by further comprising a towing means for pulling the armature toward the core side, a spring member for biasing the armature toward the adjusting plate side, and a temporary fixing means for the pressure receiving plate and the adjusting plate.

In the non-excitation actuated electromagnetic brake having such a structure, the pressure receiving plate and the adjusting plate are temporarily fixed with their centers aligned, and then the stopper member is fitted in the annular groove formed by these members. To do. Since the pressure receiving plate and the adjusting plate are engaged with and supported by the guide pin fixed to the field core, the temporary fixing is released, so that the gap can be adjusted while aligning the stopper member. Easy to assemble and easy to assemble.

[0009]

1 to 4 show a non-excitation actuated type electromagnetic brake shown as an embodiment of the present invention,
1 is a plan view, FIG. 2 is a vertical sectional view of FIG. 1, FIG. 3 is a lower half sectional view shown in an excited state, and FIG. 4 is a lower half sectional view shown in a non-excited state. The non-excitation actuated electromagnetic brake shown in these drawings is used as a safety brake that is mounted on the housing of a motor to brake the inertial rotation of the rotating shaft and hold it stationary.

Reference numeral 1 denotes a field core fixed to a motor housing 2 with bolts (not shown). The field core 1 has an annular groove 1a into which an electromagnetic coil 3 is inserted and fixed with an insulating resin, and a circumference. Similarly to the screw hole 1c which is formed in a position that divides the direction into three equal parts and opens to the magnetic pole surface 1b side,
It has a spring hole 1d formed at a position that divides the circumferential direction into three equal parts and opening toward the magnetic pole surface 1b. A screw portion 4a of a guide pin (stud bolt) 4 is screwed into each screw hole 1c and fixed by an adhesive material. Further, the guide pin 4 is formed with a large diameter portion 4b, a small diameter portion 4c, and a screw portion 4d at the tip from the magnetic pole surface 1b side of the field core 1.

The large diameter portion 4b of each guide pin 4 is inserted into a through hole 5a of a disk-shaped armature 5 which faces the magnetic pole surface 1b of the field core 1 with a gap G having a predetermined width. The armature 5 has a through hole 5a formed at a position dividing the circumferential direction into three equal parts and a stepped through hole 5b similarly formed at a position dividing the circumferential direction into three equal parts. The small-diameter portion 4c of each guide pin 4 is inserted into the through hole 6a of the disk-shaped pressure receiving plate 6, and the screw portion 4d is inserted into the through hole 7a of the disk-shaped adjusting plate 7. .

The pressure receiving plate 6 has a through hole 6a formed at a position dividing the circumferential direction into three equal parts, and a through hole 5b of the armature 5.
So that the center coincides with another through hole 6b formed at a position that divides the circumferential direction into three equal parts, and a bolt 12 of a temporary fixing means, which will be described later, is screwed together, the circumferential direction becomes three equal parts. It has a screw hole 6c formed at a dividing position. The adjusting plate 7 is formed at a position that divides the circumferential direction into three equal parts so that the through hole 7a formed at the position that divides the circumferential direction into three parts and the center of the screw hole 6c of the pressure receiving plate 6 coincide with each other. Insertion hole 7b for bolt 12
And a notch portion 7 formed at a position that divides the circumferential direction into three equal parts so as to escape the connecting pin 18 of the pulling means described later.
c.

Further, the adjusting plate 7 has an annular inclined surface 7d formed on the side surface on the pressure receiving plate 6 side, and between the pressure receiving plate 6 and the adjusting plate 7, a groove width is formed toward the radially outer opening. An annular groove 8 having a widened area is formed. And this annular groove 8
A stopper member 9 whose one side surface is an inclined surface having the same inclination angle as the inclined surface 7d of the adjusting plate 7 is fitted therein. The stopper member 9 is a member made of a metal material having a C shape in a plan view, and is fitted into the annular groove 8 in a state where the diameter thereof is widened, so that the force in the central direction for self-recovery is exerted. It is working.

The component of the force of the stopper member 9 acts on the pressure receiving plate 6, but the movement of the pressure receiving plate 6 is restricted by the slider 10 press-fitted into each guide pin 4, so that the above-mentioned component is generated. The pressure receiving plate 6 does not move unless a load in the axial direction exceeding the force acts. Further, the adjusting plate 7 interposes the shim 11 and then the guide pin 4 in order to adjust the gap G formed between the field core 1 and the armature 5.
It is supported by the screw portion 4d and is fixed by a nut screwed to the screw portion 4d. Further, a bolt 12 is screwed into the screw hole 6c of the pressure receiving plate 6 as a temporary fixing means, which is inserted from the through hole 7b of the adjusting plate 7.

On the other hand, at the tip of the rotary shaft 13 of the motor, a hub 14 is fitted with a key and prevented from coming off by a snap ring.
The hub 14 is fitted with a friction plate 15 on both sides.
The brake disc 16 to which is fixed is spline-fitted. The brake disc 16 is sandwiched between the armature 5 and the pressure receiving plate 6 by the spring force of the braking spring member 17 inserted into the spring hole 1d of the field core 1.

Next, the traction means will be described. A connecting pin 18 is inserted into the through hole 5b of the armature 5 and the through hole 6b of the pressure receiving plate 6. At one end of the connecting pin 18, a snap ring 19 that abuts a side surface of the armature 5 and a step portion 5 in the through hole 5b of the armature 5 are provided.
The snap ring 20 facing c is hooked.
A gap g equal to the gap G between the field core 1 and the armature 5 is formed between the step portion 5c and the snap ring 20. A slider 21 arranged on the side surface on the pressure receiving plate 7 side is press-fitted to the other end of the connecting pin 18. The slider 21 is fixed to the pressure receiving plate 6 by a cover 22.

In the non-excitation actuated electromagnetic brake having the above-mentioned structure, in the non-excitation state where the electromagnetic coil 3 is not energized (the state shown in FIG. 2), the armature 5 is pressed by the armature 5 by the spring force of the braking spring member 17. 6. The brake disc 16 and the rotary shaft 13 on which the brake disc 16 is mounted are braked and held stationary because they are pressed against the 6 / adjustment plate 7 side. Moreover, in the excitation state (state of FIG. 3) in which the electromagnetic coil 3 is energized,
The armature 5 is resisted against the spring force of the braking spring member 17.
Is magnetically attracted to the magnetic pole surface 1b of the field core 1, so that the brake disc 16 and the rotary shaft 1 on which the brake disc 16 is mounted are attached.
In the case of 3, the constraint is released and the rotation is free.

By repeating the non-excitation and excitation operations as described above, the friction plate 15 of the brake disc 16 is abraded and the gap G between the field core 1 and the armature 5 becomes the gap G + α. When the state is switched to the non-excited state, the movement amount of the armature 5 by the braking spring member 17 increases by the wear dimension α of the gap G, so that the connecting pin 18 also projects from the slider 21 by the wear dimension α. (See Figure 4).

When the non-excitation state is switched to the excitation state, the gap g between the snap ring 20 of the connecting pin 18 and the step portion 5c of the armature 5 becomes the initial gap G between the field core 1 and the armature 5. Since the armatures 5 are set to be equal to each other, when the armature 5 is magnetically attracted to the field core 1, it resists the sliding resistance force of the slider 10 and wears through the connecting pin 18 and the slider 21 by a wear dimension α.
The pressure receiving plate 6 is towed by the armature 5 toward the field core 1 side. When the pressure receiving plate 6 moves and the annular groove 8 widens, the stopper member 9 bites between the pressure receiving plate 6 and the adjusting plate 7 by self-recovery. Then, the retreat of the pressure receiving plate 6 to the adjusting plate 7 side is prevented.

By repeating the above operation,
In the assembly of the non-excitation actuated electromagnetic brake in which the air gap is automatically adjusted, first, the guide pin 4 is screwed and fixed to the field core 1 in which the electromagnetic coil 3 is installed, and the armature 5 is connected with the towing means. Assemble the pin 18. Further, after the slider 21 and the cover 22 are assembled to the pressure receiving plate 6, the pressure receiving plate 6 and the adjusting plate 7 are overlapped and temporarily fixed by the bolt 12 of the temporary fixing means. Then, the stopper member 9 is fitted into the annular groove 8.

Next, after inserting the braking spring member 17 into the spring hole 1d of the field core 1 with the magnetic pole surface 1b facing upward, the armature 5 is inserted into the field core 1 while inserting the guide pin 4 into the through hole 5a. Put on. Further, after the brake disc 16 is placed on the armature 5 and the slider 10 is press-fitted into the guide pin 4, the guide pin 4 is inserted into the through holes 6a and 7a and the connecting pin 1 is inserted.
The pressure-receiving plate 6 and the adjusting plate 7 which are temporarily fixed are placed on the brake disc 6 while press-fitting 8 into the slider 21 through the through hole 6b. Then, the gap G is adjusted to guide pin 4
After the nut is screwed into the threaded portion 4d, the bolt 12 of the temporary fixing means is removed to complete the assembly work.

In the above-mentioned non-excitation actuated electromagnetic brake described as the embodiment, a gap is provided between the snap ring 20 of the connecting pin 18 and the step portion 5c of the through hole 5b of the armature 5 as a towing means. Although the structure in which the gap g equal to G is set has been described, the pulling means shown in FIG. 5 may be used. FIG. 5 is a sectional view of the lower half shown in a non-excited state.

That is, a stepped through hole 5d having a large diameter on the pressure receiving plate 6 side is formed in the armature 5 and the through hole 5 is formed.
The cover 23 is fixed to the opening of d. Further, the connecting pin 18 inserted into the through hole 6b of the pressure receiving plate 6 and fixed by the pair of snap rings 25 is press-fitted into the slider 24 to form a gap g equal to the gap G, and the cover 23 and the slider 2.
The structure set between 4 can be used.

In the non-excitation actuated electromagnetic brake having such a structure, when the friction plate 15 of the brake disc 16 is worn, when the friction plate 15 is switched to the non-excitation state, the wear amount of the friction plate 15 causes the connecting pin of the armature 5 and the slider 24 to be connected. The press-fitting position of 18 is moved to the pressure receiving plate 6 side. Further, when switching to the excitation state, the pressure receiving plate 6 is towed by the armature 5 due to the wear of the friction plate 15, so that the stopper member 9 bites between the pressure receiving plate 6 and the adjusting plate 7 by self-recovery. And
The retreat of the pressure receiving plate 6 to the adjusting plate 7 side is prevented.

On the other hand, although the stopper member 9 of each non-excitation actuated electromagnetic brake is exemplified as a member capable of elastic deformation, the inclined surface 27a is formed like the stopper member 26 shown in the plan view of FIG. The pair of arc-shaped stoppers 27 may be connected by a pair of spring members 28. Although the temporary fixing means using the bolts 12 is illustrated,
It may be a clip that sandwiches the pressure receiving plate 6 and the adjusting plate 7 that are overlapped from the outside.

[0026]

As described above, in the non-excitation actuated electromagnetic brake of the present invention, the pressure receiving plate and the adjusting plate are temporarily fixed, the stopper member is fitted into the outer annular groove, and the assembly is completed. Since the temporary fixing means is removed, the assembly is simplified and the productivity is improved. Further, since the stopper member prevents the pressure receiving plate from moving toward the field core side by the slider press-fitted into the guide pin,
It is not necessary to incorporate a separating spring member, which serves as a reaction force of the braking spring member, between the armature and the pressure receiving plate, and braking of the brake disc can be quickly performed when switching to the non-excitation state.

Further, in the conventional non-excitation actuated electromagnetic brake, the spring member for urging the stopper member is arranged in the radial direction and incorporated in the cup member for adjusting the initial gap. However, the non-excitation actuated electromagnetic brake of the present invention has a structure in which a stopper member is fitted between the pressure receiving plate and the adjusting plate, and the initial gap is adjusted by the adjusting plate fixed to the tip of the guide pin. Since the structure is adopted, there is no thread groove processing on the outer peripheral surface of the field core and no cup-shaped molding processing of the adjusting member, and it is possible to provide a lightweight, small-sized, non-excitation actuated electromagnetic brake.

[Brief description of the drawings]

FIG. 1 is a plan view of a non-excitation actuated electromagnetic brake shown as an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of FIG.

FIG. 3 is a sectional view of the lower half shown in an excited state.

FIG. 4 is a cross-sectional view of the lower half shown in a non-excited state.

FIG. 5 is a sectional view of the lower half of the non-excitation actuated electromagnetic brake shown as another embodiment of the present invention.

FIG. 6 is a plan view of a stopper member.

[Explanation of symbols]

1 ... Field core, 3 ... Electromagnetic coil, 4 ... Guide pin, 5 ... Armature, 6 ... Pressure receiving plate, 7 ... Adjusting plate, 8 ...
Annular groove, 9 ... stopper member, 10 ... slider, 12 ... temporary fixing bolt, 16 ... brake disc, 17 ... braking spring member, 18 ... connecting pin, 19 ... snap ring,
20 ... snap ring, 21 ... slider, 22 ... cover, 23 ... cover, 24 ... slider, 25 ... snap ring, 26 ... stopper member.

Claims (1)

[Claims] 1. A field core in which an electromagnetic coil is provided, a plurality of guide pins fixed to the magnetic pole surface of the field core and arranged at intervals in the circumferential direction, and the guide pins in the axial direction. The armature is allowed to move and is supported, and the armature faces the magnetic pole surface of the field core with a gap of a predetermined width, the armature faces the armature via a brake disc, and the guide pin is allowed to move in the axial direction. Formed by the pressure receiving plate that is supported by the pressure receiving plate, the adjusting plate that is overlapped with the pressure receiving plate and fixed to the tip of the guide pin, the pressure receiving plate and the adjusting plate, and that faces toward the radially outer opening. An annular groove having a wide groove width, and a stopper portion fitted into the annular groove and biting between the pressure receiving plate and the adjusting plate, and having a thin wall thickness toward the inner side in the radial direction. A member, a slider arranged on the guide pin for limiting the movement of the pressure receiving plate due to the force of the stopper member, the armature and the pressure receiving plate are connected to each other when the gap increases. Increase,
A pulling means for pulling the pressure receiving plate toward the field core side by the movement of the armature, a spring member for urging the armature toward the adjusting plate side, and a temporary fixing means for the pressure receiving plate and the adjusting plate are provided. A non-excitation actuated electromagnetic brake characterized by the following.