JPH026926B2 - - Google Patents

Abstract

PURPOSE:To prevent howling upon braking, in a spline slidable type electromagnetic brake, by fitting vibration damping materials in holes formed in the end face of a core body so that the brake may be resiliently coupled to the end wall of a motor. CONSTITUTION:Vibration damping materials 20 are fitted in several holes formed in the attaching surface 16a of a core body 16, opposing a motor 2, and are slightly projected at their front ends from the attaching surface of the core body 16 by a distance delta, so that they are yielded within a range of delta when the brake is attached to the motor 2, while attaching bolts 3 are tightened. Upon braking frictional vibration between a brake disc 6 and fritction pads 5 is transmitted to the core body 16 through guide pins 7, and is absorbed by the vibration damping materials 20 having a damping effect between the core body 16 and the motor 2, thereby, the generation of howling may be prevented. The vibration damping material 20 are selected to those having a different damper effect or a different projected distance delta, in accordance with the kind of vibration, or the number of the vibration damping materials 20 is changed in accordance with the kind of vibration.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a squeal prevention device for an electromagnetic brake that is integrally attached to an electric motor or the like.

This type of electromagnetic brake, as shown in Figure 1,
A main shaft 17 extends from both ends of the electric motor 2, and a driven machine is connected to one end, while an electromagnetic brake is arranged to surround the other end.

The electromagnetic brake includes a core body 16 that accommodates an electromagnetic coil, a brake disc 6, and 1s arranged on both sides of the core body 16.
The core body 16 is connected to the end wall of the electric motor 2 with a mounting bolt 3.

As shown in FIG. 2, the core body 16 internally supports an electromagnetic coil 12, and when it is energized from the power cord 15 during braking, it exerts an electromagnetic repulsive force on the back metal 4 of the friction pad 5 and guides it. It is moved along the pin 7 to press the friction pad 5 against the brake disc 6, and the brake disc 6 is also moved and pressed against the friction pad 5 on the opposite side to generate braking force.

The core body 16 has a shaft hole 13 in the center that is loosely inserted into the main shaft 17, and also has a plurality of bolt insertion holes 3a on the outer circumferential side. It is designed to be fixed to the wall.

The brake disc 6 is integrally equipped with a boss portion 6a,
As shown in FIG. 3, a square hole 1 provided in the boss portion 6a
4 and the hub 10 is fitted thereto. A main shaft 17 of the electric motor is fitted into a shaft hole 9 having a keyway 8 provided in the hub 10 and rotated together with the main shaft 17.

The electromagnetic brake described above is characterized by its overall small size and simple configuration.
During braking, frictional vibration between the friction pad 5 and the brake disc 6 often causes so-called squeal (brake noise).
may occur.

Conventionally, measures have been proposed to prevent such squealing, such as using cast iron material for the back metal 4 that supports the friction pads 5, but this method is based on materials punched out from a thick plate using a press. This is undesirable in terms of increased costs, and furthermore, since frictional vibrations vary depending on the usage conditions of the electric motor, sufficient effects may not always be obtained.

An object of the present invention is to reduce the noise caused by frictional vibration during braking by interposing a vibration isolating material between the core body and the motor, which can be easily replaced depending on the usage conditions of the motor. It is an object of the present invention to provide an electromagnetic brake capable of preventing such problems.

For this reason, the configuration of the present invention is such that the brake disc is supported by a spline on the main shaft of the prime mover, and the first and second friction pads arranged on both sides of the brake disc are immobile and straddle the brake disc. is supported by the guide pin of
In the electromagnetic brake, the second friction pad is moved along the guide pin by electromagnetic repulsion and is pressed together with the first friction pad on both sides of the brake disc, in which the core body is An electromagnetic coil that generates an electromagnetic repulsion force against the back metal of the second friction pad and the guide pin are supported, and a plurality of holes are provided in the end surface of the core body opposite to the second friction pad, A vibration isolating material such as rubber having a tip protruding from the hole is fitted and supported in the hole, and the core body is attached with a mounting bolt so that the vibration isolating material is elastically abutted against the end wall of the prime mover. By engaging with the end wall of the prime mover, squealing during braking is prevented.

To explain the present invention based on examples, the fourth,
As shown in FIG. 5, a large number of holes are provided in the mounting surface 16a of the core body 16 facing the electric motor 2, and a cylindrical vibration isolating material 20 made of rubber or the like is installed inside these holes.
and attach this tip to the mounting surface 16 of the core body 16.
It is attached so that it protrudes slightly from a by a distance δ (Fig. 6). Then, when attaching the core body 16 to the electric motor 2, the vibration isolating material 20 is bent within the range of δ, and the attachment bolts 3 are tightened and fixed so as to press the attachment surface 16a against the end wall 2a of the electric motor 2.

By configuring the present invention as described above,
During braking, the frictional vibration between the brake disc 6 and the friction pad 5 is transmitted to the core body 16 through the guide pin 7, and is transmitted between the core body 16 and the electric motor 2 by the vibration isolating material 20 having a damping effect. Since it is absorbed, it is possible to prevent the occurrence of squealing.

The electric motor 2 varies depending on its output and other specifications.
The rotation speed and output torque also vary depending on the usage conditions. Although the type of vibration (amplitude, frequency) differs depending on the type of vibration, it is recommended to replace the vibration isolating material 20 with one that has a different damping effect depending on the type of vibration, for example, one with a different dimension δ protruding from the mounting surface 16a, or By changing the number of vibration isolators 20 used, the occurrence of squeal can be prevented.

According to the present invention, by selecting the dimensions, number and arrangement of the vibration isolating materials 20, the most effective damping effect can be achieved with respect to the noise, which occurs under different conditions depending on the usage status of the electric motor as described above. can be expected. Further, a countermeasure can be easily taken by simply providing a hole into which the vibration isolating material 20 is fitted in a conventional electromagnetic brake, and costs can be kept to a minimum.

[Brief explanation of drawings]

Fig. 1 is a side view showing an outline of a general electric motor equipped with an electromagnetic brake, Fig. 2 is a side sectional view showing the same with the electromagnetic brake removed, and Fig. 3 is a front view of the same.
4 is a side sectional view of the electromagnetic brake according to the present invention, FIG. 5 is a side view taken along the line - in FIG. 4, and FIG. 6 is an enlarged sectional view of the main part of FIG. 4. 2: Electric motor, 3: Mounting bolt, 4: Back metal, 5:
Friction pad, 6: Braking disc, 7: Guide pin, 1
2: Electromagnetic coil, 16: Core body, 17: Main shaft,
20: Vibration isolating material.

Claims (1)

[Claims] 1. A brake disc supported by a spline on the main shaft of the prime mover, first and second friction pads arranged on both sides of the brake disc are supported by immovable guide pins that straddle the brake disc, In the electromagnetic brake in which the second friction pad is moved along the guide pin by electromagnetic repulsion and is pressed together with the first friction pad on both sides of the brake disc, the core body is An electromagnetic coil that generates an electromagnetic repulsion force against the back metal of the second friction pad and the guide pin are supported, and a plurality of holes are provided in the end surface of the core body opposite to the second friction pad, A vibration isolating material such as rubber having a tip protruding from the hole is fitted and supported in the hole, and the core body is attached with a mounting bolt so that the vibration isolating material is elastically abutted against the end wall of the prime mover. An electromagnetic brake characterized in that it is coupled to an end wall of the prime mover to prevent squealing during braking operation.