JPS628660Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a non-excitation operated electromagnetic brake.

Conventionally, this type of electromagnetic brake includes an excitation-actuated brake that performs braking by energizing an electromagnet, and an excitation-actuated brake that performs braking by cutting off energization (naturally,
There are two types of brakes: a non-excitation type brake that uses gravity, spring force, permanent magnet force, etc. as the operating force. Although these are the same in that they are operated by electromagnets, their structures and purposes of use are vastly different and are considered to belong to different fields.

Among these latter types, the spring arrangement method for those operated by spring force has been conventional, for example, a coil with a large diameter is compressed and placed in the center of the movable plate, or a coil with a large diameter is compressed. There is one in which a plurality of long ones with relatively small diameters are arranged evenly around the outer periphery of the movable plate.

As for the required characteristics of these coil springs, it is desirable to minimize changes in the amount of deflection of the coil spring due to wear of the friction material, changes in the repelling force of the spring due to this, that is, changes in the braking frictional force. Therefore, a coil spring with a small spring constant is required, and there are problems in that such a coil spring requires a considerable volume to be mounted and is expensive.

In addition, the general structure of a non-excitation type brake that uses spring force is to place a single movable iron plate in front of a magnet fixed to the machine body, and press this with a friction member fixed to the shaft to be braked. The basic idea is to encourage people. According to this, in order for the movable steel plate to generate braking force, it requires a mechanism that can move in the axial direction and hold it in the rotational direction. That was what was being done. This mechanism also had the disadvantage of causing friction and wear during operation.

In light of the above, the present invention is directed to a non-excitation operated electromagnetic brake, and in the conventional non-excitation operated type brake, the armature 3 guided by the stud bolt 11 is electrically operated as shown in Fig. 1. Due to the excitation of the excitation coil 2, the armature 3 may be attracted to the magnet 1, or when the coil 2 is de-energized, the armature 3 may be moved toward the friction material 8 side due to the elastic force of the spring 10 for brake operation. When doing so, fretting wear occurs due to buck crushing between the stud bolt 11 and the inner peripheral surface of the mounting hole 3c of the armature, and the slight rotation caused by buck crushing may produce a hitting sound, and the armature 3 may become stuck due to catching between the two. In addition to causing malfunctions, there were also problems in that the stopping state during non-excitation was incompletely maintained.

The present invention was developed to solve these problems, and the armature is fixed in the rotational direction and slidable in the axial direction with respect to the fixed part on the magnet and stud bolt side. By enabling motion-free movement, there is no sliding resistance or wear, allowing smooth brake operation.
There is no knocking noise caused by bumping, and the stoppage can be reliably maintained when not energized.Furthermore, it can be manufactured without requiring high machining precision, and anti-wear measures such as hardening oil supply are not required. Another object of the present invention is to provide an electromagnetic brake that is dimensionally smaller in both the axial and radial directions by replacing the coil spring with a leaf spring.

Embodiments of the present invention will be described below based on the drawings.

First, to explain the configuration, as shown in FIGS. 2 to 4, a magnet 1 has a built-in electromagnetic coil 2 that is fixed non-rotatably to the machine main body. On the front side, a magnet 1 is provided with a disk surface that extends in the circumferential direction. An armature 3 in which collar holes 3a and screw holes 3b are alternately provided at intervals.
is arranged to be movable in the axial direction.

A disk 9 having a friction material 8 attached to its rear surface is concentrically disposed at the front portion of the inner periphery of the armature 3 so as to be fixable to a rotating shaft.

On the front surface of the outer periphery of the armature 3, a plate spring 6 is provided with bolt holes equally spaced in the circumferential direction on the circumferential surface of an annular band plate as shown in FIG. It is held by joining the distance collar 5 to the collar 5 and clamping it with a long stud bolt 4 inserted so as to penetrate the collar 5 from the front side to the back side.

The elongated stud bolt 4 described above is screwed into the magnet 1 through the distance collar 5 which is loosely fitted into the collar hole 3a of the armature 3.

Next, a short stud bolt 7 is installed at the bolt hole position of the leaf spring 6 where the distance collar 5 is not interposed.
is inserted and forced to screw hole 3 of armature 3.
b is screwed into the leaf spring 6, and a preload is applied to the leaf spring 6 in the axial direction. Therefore, armature 3 is
With the elastic traction force of the leaf spring 6, it is held so as to be strongly pressed against the friction material 8 when not energized, and is fixed in the rotational direction.

Further, the distance collar 5 is formed so that its length matches the sum of the thickness of the armature 3 and the amount of movement of the armature 3 in the axial direction, and its diameter is formed smaller than the collar hole 3a of the armature 3. The armature 3 is loosely fitted into the collar hole 3a so as to be movable in the axial direction.

Next, the action will be explained.

As shown in Fig. 2, attach the magnet 1 to the machine body A.
The disk 9 is fixed to the rotation axis B of the machine body A.
If an electromagnetic brake is installed to fix the rotary shaft B, since the armature 3 is strongly pressed against the friction material 8 of the disc 9 by the elastic traction force of the leaf spring 6 when not energized, it is possible to keep the rotating shaft B in a stopped state. can.

Furthermore, when the electromagnetic coil 2 is excited, the armature 3 is attracted to the magnet 1 against the elastic pulling force of the leaf spring 6, so that rotation of the rotating shaft B can be allowed.

Next, when stopping the rotating shaft B in response to a request from the machine main body A, when the power to the electromagnetic coil 2 is cut off, the armature 3 is strongly pressed against the friction material 8 by the elastic traction force of the leaf spring 6, so that the rotating shaft B can be stopped quickly. can be stopped.

In this case, the armature 3 is fixed in the rotational direction by the leaf spring 6, and can move in the suction and braking direction without slidingly contacting the distance collar 5, so there is no sliding resistance or wear. , the brakes can be operated smoothly.

Therefore, fretting wear does not occur at the position of the collar hole 3a that does not come into sliding contact with the distance collar 5, so it is possible to eliminate the occurrence of hitting noise caused by bumping.

As explained above, in this invention, if the armature is attached to the magnet side using a plate spring that is fixed in the rotational direction and movable in the axial direction, the armature can be attached to the stud bolt and distance collar that form the connecting shaft. Not only can you maintain contact-free,
Since there is no buckling during rotation, the armature 3 can perform smooth braking without sliding resistance or wear, which improves the performance of electromagnetic brakes. This eliminates the need for anti-wear measures such as lubrication, which has the effect of significantly reducing costs.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal side view showing a conventional electromagnetic brake, Fig. 2 is a longitudinal side view showing half the body of the electromagnetic brake according to the present invention mounted on a machine body, and Fig. 3 is an armature of the electromagnetic brake. 4th vertical cross-sectional side view showing how the plate spring is connected to the plate spring;
The figure is a perspective view showing the single structure of the electromagnetic brake. Explanation of symbols 1... Magnet, 2... Electromagnetic coil, 3... Armature, 3a... Collar hole, 3
b...screw hole, 4,7,11...stud bolt, 5...distance collar, 6...plate spring,
8...Friction material, 9...Disc, 10...Spring, A...Machine body, B...Rotating shaft.

Claims (1)

[Scope of utility model registration request] A magnet 1 with a built-in excitation coil 2 is fixed on the front side of the machine body A, a disk 9 is fixed on a rotating shaft B protruding forward from the magnet 1, and a friction material 8 is fixed on the rear surface of the disk 9. Attach the
Between the friction material 8 and the magnet 1, an armature 3 is provided with collar holes 3a and screw holes 3b alternately provided.
The armature has a plate spring 6 fixed to its front side by inserting a stud bolt 7 into the bolt hole of the plate spring 6 and screwing the stud bolt 7 into the screw hole 3b. 3 is provided in the collar hole 3a of the armature 3.
A distance collar 5 having a diameter smaller than a and a length larger than the gap between the surface of the friction material 8 and the front surface of the magnet 1 is inserted, and the leaf spring 6 is
A stud bolt 4 that is inserted into the other bolt hole of the leaf spring 6 and the distance collar 5 is screwed and fastened to the front surface of the magnet 1 from the front side of the magnet 1, so that the leaf spring 6 moves the armature 3 with the friction when not energized. A non-excitation operated electromagnetic brake characterized by being biased in the direction of the material 8.