JPH08284979A - Electromagnetic brake - Google Patents

Abstract

PURPOSE: To reduce the impact noise with a simple structure by fitting a ring- shaped muffling corrugated spring made of one sheet to an outer marginal part opposite to a magnet and an armature. CONSTITUTION: When a regular coil 2 is not excited, a yoke 1 and an armature 3 are in the separated condition by a brake spring 5, and a rail 46 is pressed to be in the braked condition by arms 41, 42 through linings 44, 45 with a supporting shaft 43 as a fulcrum. When the exciting current flows in the regular coil 2, the armature 3 is attracted against the brake spring 5 to release the braking. During the attraction, the armature 3 is abutted on the yoke 1 with a large impact. The impact is absorbed by a muffling corrugated spring 6 fitted to an outer marginal part opposite to the yoke 1 of the armature 3 to greatly reduce the impact noise. In the muffling corrugated spring, projecting parts or recessed parts are formed with equal intervals at several thin ring parts of one spring stock, and the muffling effect can be kept for a long time for the repeated action.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic brake to which an electromagnet is applied.

[0002]

2. Description of the Related Art An example of the structure of a non-excitation actuated electromagnetic brake is shown in FIGS. In the figure, 51 is a magnet having a structure in which a coil 51B is mounted on a core (yoke) 51A, 52 is a lining (friction material), 53 is an armature (movable core) that performs a braking action with the lining 52, and 54 is a braking. A spring, 55 is an end plate (rotating disk), and 56 is a noise reduction shim. When the coil 51B is not excited, the armature 53 strongly presses the lining 52 by the force of the braking spring 54 to bring it into a braking state. When the coil 51B is excited, the armature 53 is attracted to the attracting surface of the magnet 51 by the electromagnetic force, and the braking is released. This allows
Rotation of the end plate 55 and the lining 52, that is, the rotation shaft of the motor or the like is allowed.

A large impact noise is generated when the brake is actuated or when the brake is released. For example, magnet 5
When 1 picks up the armature 53, it is at the peripheral edge and the braking spring 54, and the magnet 51 makes the armature 5
When 3 is released, an impact sound is generated at the edge of the inner peripheral surface of the lining 52. For this reason, several thin ring-shaped iron plates are piled up, and several places on the outer periphery (for example, four places at equal intervals)
The silencer shim 56 with the nail 56A formed on the armature 53
It is attached to the outer edge of the to reduce impact noise.

[0004]

However, the muffling shim 56 having a structure in which a plurality of thin plates are superposed has the following problems.

1). Since it is ring-shaped, the material yield is low, and since several of them are piled up, the cost becomes higher.

2). Although it is fixed to the armature 53 by the claws 56A at several places, it is difficult to firmly fix it.

3). There is a large difference in the sound deadening effect depending on the fixing method (the sound deadening effect is small when rigidly fixed with rivets etc., and the sound deadening effect is higher if the individual pieces are fixed in a free state).

4). Since it is a thin iron plate, it has a short life with respect to repeated operations, which not only causes maintenance problems, but also breakage of the iron plate adversely affects braking operation.

5). If the silencing shim has a structure of a single thick plate in consideration of the above items, the silencing effect becomes poor.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above problems and to provide an electromagnetic brake capable of reducing impact noise with a simple structure.

[0011]

According to the present invention, a magnet having a structure in which a coil is mounted on a yoke is attracted to and released from an armature, and the armature and the friction surface on the braking target side are followed or follow the armature. In an electromagnetic brake that performs a braking action between a friction surface provided on an arm and an object to be braked, a ring-shaped sound absorbing spring of a single plate is attached to an outer edge portion of a surface facing a magnet and an armature, and a sound absorbing spring. Is formed of a non-magnetic material.

[0012]

[Operation] The armature comes into contact with the magnet (or the friction surface) with a large impact force when the magnet is attracted. The impact force at this time is absorbed by the cushioning action of the sound deadening spring. Therefore, impact noise is significantly reduced.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings.

An embodiment of an electromagnetic brake according to the present invention is shown in FIG.
Shown in The embodiment is a case of a non-excitation actuated electromagnetic brake for an elevator. In the figure, 1 is a yoke, 2 is a service coil mounted on the side of the yoke 1, 3 is an armature, 4 is an emergency coil mounted on the side of the armature 3, 5 is a braking spring, 6 is a sound wave canceling spring, and 7 is a spring. Receiver, 8 is a spring load adjusting ring, 9 and 10 are thermoguards, 11 and 1
2 is a support rod. One support rod 11 is fixed to the yoke 1 while penetrating the central portion of the yoke 1. The other support rod 12 has a cylindrical shape of about half of which is slidably fitted to the one support rod 11, and has a threaded portion formed on the outer peripheral surface of about half of the remaining portion toward the center.
It is screwed into the screw hole of the spring load adjusting ring 8. The spring load adjusting ring 8 is fixed to the armature 3 while adjusting the load with the lock bolt 13.

The yoke 1 and the armature 3 are formed so that concaves and convexes (for example, a concave portion 1A on the yoke 1 and a convex portion 3A on the armature 3) can be fitted to the facing magnetic path portions.
This concavo-convex processing is to make the electromagnet combine the characteristics of the facing type electromagnet and the plunger type electromagnet, and its depth, height, number, position, etc. are the required distance-suction force characteristics (flat characteristics). To be set.

As shown in FIGS. 2 and 3, the sound deadening spring 6 has a corrugated shape by forming convex portions (or concave portions) 6A at several intervals, for example, at 6 points on a thin ring of spring material. And its outer diameter is substantially equal to the outer diameter of the yoke 1 and the armature 3. In FIG. 2, the lower portion sandwiched between the convex portions 6A on both sides is shaded. In other words, the recesses are formed at six locations at equal intervals. The sound deadening spring 6 is attached so that the yoke 1 or the armature 3 is provided with several convex portions and the inner peripheral surface is in contact with the convex portions. In the embodiment, the sound deadening spring 6 is attached by utilizing a part of the uneven convex portion 3A formed to improve the suction force characteristic.

The support rods 11 and 12 have their ends connected to the arms 41 and 42 by pins. The arms 41 and 42 are rotatably attached to the support shaft 43 at their intermediate attachment portions, and the linings 44 and 45 are provided inside the tip portions.
Is fixed so that the rail 46 is clamped by holding the rail 46 therebetween. The tips of the arms 41, 42 (lining 4
4 and 45), manual release bolts 47 are provided.

Next, the operation will be described. Normally, the regular coil 2 is used. When the service coil 2 is not excited, the yoke 1 (the magnet including the coil 2) and the armature 3 are in the separated state by the force of the braking spring 5, and the support rods 11 and 12 are in the most opened positions. In this state, with the support shaft 43 as a fulcrum, the arm 41 moves counterclockwise,
Turning force acts clockwise on 2 and lining 4
The rails 4, 45 strongly press the rail 46. That is, it is in a braking state. When an exciting current is passed through the service coil 2, the armature 3 is attracted against the force of the braking spring 5. In this attraction operation, both the magnet and the armature 3 move and attract. At this time, the arm 41 moves toward the support shaft 43.
The arm 42 rotates counterclockwise about the fulcrum, and the linings 44 and 45 move away from the rail 46. That is, the braking is released.

When the armature 3 is attracted by the magnet, the armature 3 contacts the yoke 1 of the magnet with a large impact force. The impact force at this time is 3 armatures.
It is absorbed by the cushioning action of the sound deadening spring 6 attached to the outer edge portion facing the yoke 1. Therefore, impact noise is significantly reduced. The sound deadening spring 6 is
The mounting is stable with a single plate, and due to its sufficient durability, the sound deadening effect is maintained for a long period of time even during repeated operations.

If the sound deadening spring 6 is made of a non-magnetic material, not only the sound deadening effect but also the response time at the time of releasing the magnet core (yoke) and the armature due to the residual magnetic force can be shortened. Further, in the above-described embodiment, even in the non-excitation actuated electromagnetic brake, the lining is engaged with the object to be braked through the arm that follows the attraction and release operations of the magnet and the armature, but the armature is directly pressed against the lining. The same can be applied to the non-excitation actuated electromagnetic brake and the excitation actuated electromagnetic brake having the structure (structure of the conventional example shown in FIG. 4).

[0021]

As described above, according to the present invention, since the ring-shaped sound absorbing spring is attached to the yoke of the armature or magnet, the impact force at the time of attraction can be absorbed by the cushioning action of the wave spring. become,
Impact noise can be significantly reduced. Moreover, since the mounting structure is such that the inner peripheral surface is in contact with the convex portion with a single plate, a stable mounting state is achieved, and a high noise reduction effect can be expected for a long time. Further, if the wave spring is made of a non-magnetic material, it is also effective in improving the response time when releasing the armature.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of an electromagnetic brake according to the present invention in a partially sectional state.

FIG. 2 is a front view showing a sound deadening spring in an embodiment of the electromagnetic brake according to the present invention.

FIG. 3 is a side view showing a sound deadening spring in the embodiment of the electromagnetic brake according to the present invention.

FIG. 4 is a sectional view showing a conventional example of a non-excitation actuated electromagnetic brake.

FIG. 5 is a front view showing a silencing shim in a conventional example.

FIG. 6 is a cross-sectional view showing a silencing shim in a conventional example.

FIG. 71 is a cross-sectional view showing an enlarged part of the silencing shim in the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Yoke 2 ... Regular coil 3 ... Armature 5 ... Braking spring 6 ... Sonic wave type spring 6A ... Convex part 11, 12 ... Support rod 41, 42 ... Arm 43 ... Support shaft 44, 45 ... Lining 46 ... Rail

[Procedure amendment]

[Submission date] August 30, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of an electromagnetic brake according to the present invention in a partially sectional state.

FIG. 2 is a front view showing a sound deadening spring in an embodiment of the electromagnetic brake according to the present invention.

FIG. 3 is a side view showing a sound deadening spring in the embodiment of the electromagnetic brake according to the present invention.

FIG. 4 is a sectional view showing a conventional example of a non-excitation actuated electromagnetic brake.

FIG. 5 is a front view showing a silencing shim in a conventional example.

FIG. 6 is a cross-sectional view showing a silencing shim in a conventional example.

FIG. 7 is an enlarged cross-sectional view showing a part of a silencing shim in a conventional example.

[Explanation of Reference Signs] 1 ... Yoke 2 ... Regular coil 3 ... Armature 5 ... Braking spring 6 ... Sinusoidal spring 6A ... Convex portion 11, 12 ... Support rod 41, 42 ... Arm 43 ... Support shaft 44, 45 ... Lining 46 ... rail

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masahiko Nemoto 3-2-1 Sakado, Takatsu-ku, Kawasaki City, Kanagawa Prefecture Otis Technical Research Institute, Japan Otis Elevator Co., Ltd.

Claims (2)

[Claims] 1. A magnet having a structure in which a coil is mounted on a yoke and an armature are attracted and released, and the armature and the friction surface on the braking target side are disposed between the armature and the armature following the armature. In an electromagnetic brake that performs a braking action with a target, an electromagnetic brake characterized in that a ring-shaped wave-dissipating spring of a single plate is attached to an outer edge portion of a surface where a magnet and an armature face each other. 2. The electromagnetic brake according to claim 1, wherein the sound deadening spring is made of a non-magnetic material.