JPS587143Y2 - electromagnetic brake - Google Patents

Description

[Detailed description of the invention] This invention relates to an improved structure of an electromagnetic brake.

First, this kind of conventional electromagnetic brake shown in FIG. 1 will be explained.

In Fig. 1, 1 is an annular stator, and 2 is this stator 1.
4 is a plate fixed to the stator 1, and 5 is a fixed body, which is fixed to a mating machine using a hole 5a.

Support rods 6 are provided protruding in the axial direction at several locations on the circumference of the fixed body 50, and are fixed in the screw holes 5b with threaded portions 6a at the tip; 6b are provided on the opposite side of the threaded portions 6a; The plate 4 is inserted into the threaded part 6b and fixed by a nut 7 so as to hold the plate 4 therebetween.

8 is an armature fitted to the support rod 6 so as to be movable in the axial direction; 9 is a rotary body fixed to a rotating shaft (not shown) and has a spline 9a on its outer periphery; 10 is a rotor between the armature 8 and the brake plate 11; The spline 9a is provided on the inner periphery.
12 is a friction plate fixed to both sides of the connecting plate 10, and 13 is inserted into the support rod 6, and the connecting plate is movable in the axial direction. 8 toward the connecting plate 10 to generate braking torque.

A first slider 14 is inserted into the support rod 6 and is provided so as to come into contact with the brake plate 11, and moves on the support rod 6 when an axial force is applied.

Reference numeral 15 indicates a hole 15a inserted into the threaded portion 6a of the support rod 6, and a hole 15a into which the end of the spring 16 is inserted.
has.

The other end of the spring is inserted into the hole 5c of the fixed body 5, and a force always acts on the spring 16 to move the nut 15 toward the armature side.

A pin 17 is fixed to the armature 8 and is provided to penetrate through the control plate 11.

18 is a retainer fixed to the brake plate 11;
A second slider 9 is inserted into the pin 17 in contact with the retainer 18.

In such a structure, the first. second slider 14,
19. The relationship between the springs 13 and 16 is set as follows: pressing force of the spring 13>moving load of the slider 19>moving load of the slider 14>propulsive force by the spring 16.

Note that the gap g and the gap g between the second slider 19 and the brake plate 11
, are equally produced.

Next, the operation of this conventional device will be explained.

In this electromagnetic brake device, the braking force is released when the excitation coil 2 is energized, and when the excitation coil 2 is energized, the braking force is generated by the pressing force of the spring 13 as shown in Fig. 1, and is usually called a safety brake. has been done.

First, when the excitation coil 2 is energized, zero magnetic flux is generated in the magnetic path shown by the broken line in FIG. , the coupling between the friction plate 12 of the connecting plate 10, the armature 8, and the brake plate 11 is released, and the braking force for braking the rotating body 9 is released.

Next, when the excitation coil 2 is deenergized, the armature 8 is pressed by the spring 13 and separated from the stator 1, and the friction plate 1
2 is brought into pressure contact with the brake plate 11 to generate braking force, and the connecting plate 1
A braking force acts on the rotor 0, and the rotary shaft is braked via the splines 9a, 10a and the rotating body 9.

Then, when the excitation coil 2 is energized again, the amateur 8
is attracted to the stator 1 and separated from the friction plate 12 of the connecting plate 10, the braking force is released, the connection is broken, and the rotating shaft rotates at a predetermined speed.

By the way, if the above-described operation is repeated, the friction surfaces of the armature 8, the brake plate 11, and the friction plate 12 will gradually wear out, and the axial gap g between the stator 1 and the armature 8 will increase accordingly.

Now, each of the above connecting surfaces is worn by α, and the gap g is (g0a
).

In this state, when the excitation coil 2 is deenergized, the armature 8 is pressed by the spring 13 and the connecting plate 10
It comes into pressure contact with the stator 1 and moves by a distance (g+α) toward the side opposite to the stator 1.

The second slider 19 also moves together with the pin 17, and when it has moved a distance g, it comes into contact with the retainer 18 and is stopped, but due to the pressing force of the spring 13, the pin 17 moves further a distance α.

That is, the second slider 19 moves on the pin 17 toward the stator 1 by α.

Next, when the excitation coil 2 is energized, the armature 8 is attracted to the stator 1 against the pressing force of the spring 13, and the armature 8 moves a distance (g+α) and comes into pressure contact with the stator 1.

At the same time, the pin 17 fixed to the armature 8 also moves by a distance (g+α), so the brake plate 11 is moved by the amount of wear on the friction surface by the second slider 19, that is, by the distance α between the first slider 14 and the brake plate. 11 and move it to the stator 1 side.

Then, a gap α is created between the brake plate 11 and the nut 15, but the nut 15 moves until it comes into contact with the brake plate 11 due to the pressing force and torsional force of the spring 16.
There is no gap between the brake plate 11 and the NAND 15.

Naturally, the slider 14 of the cylinder 1 also moves toward the stator 1 by an amount α to fix the brake plate 11.

When the excitation coil 2 is deenergized, the armature 8 moves by a distance g and presses the connecting plate 10.
is in pressure contact with the brake plate 11 via the friction plate 12 to perform braking.

Thereafter, such an operation is repeated to perform a braking operation.

However, the force exerted by the excitation coil 2 to attract the amateur 8 is considerable because it overcomes the spring 13.

Therefore, when a suction force is applied to the armature 8, the resulting suction speed is very high, and the stator 1 is suctioned with considerable velocity energy.

Therefore, naturally, the pin 17 and the second slider 19 also move toward the stator 1 like the armature 8 described above.

In this case, if there is a wear allowance α and the gap is (g+α), the brake plate 11 is moved by the slider 19 by α.
must be moved toward the stator 1, but as described above, the velocity energy of the movement is extremely large, and a moving force must be sufficient to overcome the inertial force of the brake plate 11.

This requires a considerable amount of moving load, and in the worst case, a force greater than the pressing force of the main spring 13 is required, resulting in a very unstable force relationship, and the gap g must always be kept constant. It becomes difficult to keep it.

Therefore, if used repeatedly, the gap g will gradually become larger as it wears out, and in the worst case, the pressing force of the spring 13 will become greater than the attractive force of the excitation coil 2, and the connecting plate 10 will be powered by the braking force. This could cause it to rotate, resulting in burnout.

This invention provides an excellent electromagnetic brake that overcomes the above drawbacks.

An embodiment of this invention shown in FIGS. 2 to 7 will be described above.

In the figure, 20 is a slider inserted into the pin 17, and 21 is a wave spring.

The slider 14, retainer 18, and slider 19 shown in FIG. 1 are omitted, and the other components are the same as those shown in FIG.

Detailed views of the wave spring are shown in FIGS. 4 and 5, but 21
A is a hole for inserting the pin 17, and 21b is a collar for providing spring force, and the height g2 of the collar 21b is made to be equal to the gap g.

In the structure configured in this way, the spring 13,
The force relationship between the slider 20, the wave spring 21, and the spring 16 is set such that the pressing force of the spring 13>the moving load of the slider 20>the force of the wave spring 21>the force of the spring 16.

Next, the operation of this embodiment will be explained.

First, when the excitation coil 2 is deenergized to brake the rotational force of the rotating shaft, the spring force of the wave spring 21 is smaller than the spring force of the spring 13 as shown in FIG.
As a result, the armature 8 is pressed against the connecting plate 10 against the wave spring 21.

The spring 13 is connected to the brake plate 11 via the connecting plate 10.
A pressing force is applied to the braking plate 11, and the nut 15 prevents the braking plate 11 from moving on the other side of the stator.

Therefore, as shown in FIG. 2, the connecting plate 10 comes into pressure contact with the brake plate 11 via the friction plate 12 to perform braking.

In this state, when the armature 8 moves by a distance g toward the side opposite to the stator 1, the pin 17 provided on the armature 8 moves, causing the slider 20 and the wave spring 21 to move.
also moves by a distance g and comes into contact with the brake plate 11.

At this time, the collar 21a of the wave spring 21 is in a compressed state.

Next, when the excitation coil 2 is energized, the attraction force of the armature 8 by the excitation coil 2 becomes stronger than the drag force of the spring 13, and the armature 8 is moved toward the stator 1 by a distance g and is pressed against the stator 1. let

Slider 20 and wave spring 21 press-fitted into pin 17 at the same time
also moves to the stator 1 side by a distance g.

Note that the flange 21a of the wave spring 21 has the height of its free length.

When the above state occurs, gaps are created between the friction plate 12 of the connecting plate 10 and the armature 8 and the brake plate 11, respectively.
Release the braking force that controls the rotating shaft.

By the way, as the above-described operations are repeated, the friction surfaces of the armature 8, the friction plate 12, and the brake plate 11 wear out, and the gap between the stator 1 and the armature 8 becomes larger than the predetermined value g.

Now, if the above friction surface is worn by α, the gap is (g
+α), and when the excitation coil 2 is deenergized in this state, the armature 8 is pressed by the spring 13 and presses against the connecting plate 10, moving away from the stator 1 by a distance (g + α).
The connecting plate 10 is prevented from moving in the axial direction by the NAND 15 due to the pressing force of the spring 13, and the fixed state is maintained.

Then, the slider 20 and the wave spring 21 also move together with the pin 17, and when they have moved by a distance g, they come into contact with the end face of the brake plate 11 and are stopped.

At this time, the collar 21a of the wave spring 21 is in a compressed state.

Furthermore, due to the pressing force of the spring 13, the pin 17 moves a distance α
Moving.

Therefore, the slider 20 moves by α toward the stator 1 on the pin 17 due to the braking plate 11.

Next, when the excitation coil 2 is energized, the armature 8 is attracted to the stator 1 side against the pressing force of the slurry ring 13.
The armature 8 moves a distance (g+α) and comes into pressure contact with the stator 1.

At the same time, the pin 17 fixed to the armature 8 also moves by a distance (g+α).

Therefore, the slider 20 and the wave spring 21 also move toward the stator 1 by a distance (
g+α) Move.

At this time, the collar 21a of the wave spring 21 is at a free height, but a gap of a distance α is created between it and the control plate 11.

At this time, the nut 15 is moved toward the stator 1 by a distance α by the spring 16.

The movement of the NAND 15 is stopped when the brake plate 11 is also moved toward the stator 1 side and comes into contact with the collar 21a of the wave spring 21.

Then, when the excitation coil 2 is deenergized again, the amateur 8
moves by a distance g to press the connecting plate 10, and this connecting plate 10 presses against the brake plate 11 via the friction plate 12 to perform braking.

The braking operation is performed by repeating the following operations.

FIG. 6 is an enlarged view of the state of the slider 20 and wave spring 21 when the armature 8 is attracted to the stator 1, and the state of the wave spring 21 can be clearly seen.

In this way, when the armature 8 is moved toward the brake plate 11 by the spring 13, the slider 20 comes into contact with the brake plate 11 via the wave spring 21, correcting the wear amount α, so that the speed seen in the past is reduced. The slider 20 slides smoothly on the pin 17 regardless of the energy and the inertia of the brake plate 11 and the like.

Furthermore, the first slider 14 is also not required, and the relationship between the forces of each part becomes simple, increasing its reliability.

Further, in the above embodiment, the pin 17 is attached to the armature 8, but the pin 17 is fixed to the brake plate 11 and the wave spring 21 and the slider 20 are brought into contact with the armature 8 as shown in FIG. I can say that.

Furthermore, the same effect can be obtained even if the wave spring 21 and the slider 20 are integrated.

Incidentally, in the above description, the connecting plate 10 is on the rotating side, and the armature 8 and the brake plate 11 are on the fixed side, but this is reversed, and the armature 8 and the brake plate 11 are connected to the rotating shaft to be on the rotating side, and the connecting plate 10 is on the rotating side. The same thing can be done even if it is fixed to a fixed body and used as a fixed side.

Moreover, although the electromagnetic brake has been described above, the same effect can be obtained even if it is used in an electromagnetic flange.

In this case, the armature 8 and the brake plate 11 are also rotatably installed and connected to another rotating shaft.

As mentioned above, in this invention, a pin is fixed to the armature, and a slider and a wave spring are provided so that it comes into contact with the brake plate, and when the armature is brought into pressure contact with the brake plate, the slider moves, so the force relationship is Since the friction plate is reduced and becomes clear, the function as an automatic gap device can work normally until the friction plate is used up.Furthermore, the structure is simple and inexpensive, and the effect is great.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional device, Fig. 2 is a sectional view showing an embodiment of this invention when braking, Fig. 3 is a sectional view showing the embodiment shown in Fig. 2 when releasing. A front view of the wave spring, Fig. 5 is a side view of Fig. 4, Fig. 6 is an enlarged view of the main part of Fig. 3, and Fig. 7 is a side view of the wave spring.
The figure is a sectional view showing another embodiment. In the figure, 1 is a stator, 2 is an excitation coil, 6 is a support rod, 8 is an armature, 9 is a rotating body, 10 is a connecting plate, 11 is a brake plate,
12 is a friction plate, 13 is a spring, 15 is a Nando, 16
17 is a spring, 20 is a slide, 21 is a wave spring, and 21a is a collar. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A connecting plate 10 spline-coupled to the rotating body 9, a brake plate 11 disposed so as to come into contact with one side of the connecting plate 100. An armature 8 disposed so as to come into contact with the other surface of the connecting plate 10, a support rod 6 that supports the brake plate 11 and the armature 8 movably in the axial direction of the rotating body 9, and an armature 8 that supports the armature 8 on the connecting plate. a spring 13 that presses against the armature 10; a fixing 71 that is provided opposite the armature 8, and that, when biased, attracts the armature 8 against the pressing force of the spring 13 and releases the connecting plate 10; and excitation; A coil 2 is inserted into the threaded portion of the support rod 6 in contact with the side of the brake plate 11 opposite to the armature 8 in order to advance the brake plate 11 when the gap between the stator 1 and the armature 8 exceeds a predetermined value. a torsion spring 16 for applying thrust to the nut 15; a pin 17 protruding from the armature 8 or the brake plate 11 in the axial direction of the rotating body 9; and a spring 21 inserted between the slider 20 and the brake plate 11 or the armature 8, the free length of which is approximately equal to the gap between the armature 8 and the stator 1. , the spring force of the spring 21 is smaller than the force of the spring 13 and larger than the forward force of the brake plate 11 of the spring 16.