JPH083341B2 - Brake device - Google Patents

Abstract

PURPOSE:To obtain a compact brake device with damping function by exciting a core and separating an armature from a disk during the rotation of the disk and demagnetizing the core to stick the armature to a disk face during the operation of the brake. CONSTITUTION:When a disk 4 is rotated together with a rotating shaft 3, a power source 10 is connected to a coil 9 to excite a core 5 and an armature 6 is attracted to an end face 5a and separated from the face of the disk 4. Since a damping function during rotation is realized due to magnetic flux phipassing the disk 4, a quick change in rotating speed is not generated. When a brake is operated, the core 5 is demagnetized and then, the armature 6 is pressed to the face of the disk 4 by a compression spring 8 to stop the rotation. In such a way, a compact device is realized by providing the damping function.

Description

Description: TECHNICAL FIELD The present invention relates to a brake device for urging an armature to a disc integrated with a rotary shaft, and more particularly to a small brake device also having a damping function during rotation. is there.

[Prior Art] Conventionally, in this type of brake device, an armature made of a magnetic material is arranged on one side of the disc surface, and while the disc is rotating, the armature is held at a position away from the disc by a solenoid during braking. Is designed so that the solenoid is demagnetized and the armature is pressed against the disk surface by a biasing means such as a compression spring.

When the rotary shaft is used in an automatic control device or the like, a permanent magnet is brought close to the disk to provide a damping function in order to prevent a sudden change in the rotation speed during operation.

[Problems to be Solved by the Invention] As described above, in the conventional brake device, the solenoid for driving the armature is arranged only on one side of the disk surface, and the magnetic circuit of the solenoid is closed via the armature. In order to realize the damping function during rotation, it is necessary to arrange a permanent magnet in addition to the solenoid,
There was a problem that the device became large.

The present invention has been made to solve the above problems, and an object thereof is to obtain a small-sized brake device that also has a damping function.

[Means for Solving the Problems] A brake device according to the present invention is an armature made of a core having end faces facing both sides of a disc, and a magnetic material provided on at least one of the end faces so as to be movable in the axial direction of the core. And a coil for exciting the core so as to separate the armature from the disk surface against the biasing force of the biasing means. is there.

[Operation] In the present invention, while the disc is rotating, the core is excited to separate the armature from the disc, and the magnetic flux passing through the disc realizes a damping function. During braking, the core is degaussed to disengage the armature. Energize the disc surface.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. The drawings are side views showing an embodiment of the present invention.

In the figure, (1) is a side substrate having a bearing (2),
(3) is a rotary shaft whose both ends are supported by a bearing (2), (4)
Is a disk made of a non-magnetic material such as copper or aluminum provided integrally with the rotating shaft (3).

(5) is an end face (5a) facing both sides of the disc (4)
And a core having (5b). (6) is an armature made of a magnetic material such as pure iron and provided on the end faces (5a) and (5b) so as to be movable in the axial direction of the core (5), and (7) is a disk (4) of the armature (6). ) Side is attached to a brake shoe, and (8) is a compression spring (urging means) for urging the armature (6) toward the surface of the disc (4), and here, one end surface (5a). Only the side is shown.

(9) is a coil for exciting the core (5),
The core (5) is excited so as to separate the armature (6) from the surface of the disk (4) against the biasing force of the compression spring (8). (10) is a power supply for driving the coil (9), and (11) is a switch for opening and closing one end of the coil (9) to selectively connect the power supply (10).

Next, the operation of the embodiment of the present invention shown in the drawings will be described. Since the configurations related to the end faces (5a) and (5b) are the same, only the armature (6) on the end face (5a) side will be described.

During normal operation, that is, when the disk (4) is rotating together with the rotating shaft (3), the switch (11) is closed and the power source (10) is connected to the coil (9). Therefore, the magnetic flux φ generated in the core (5) when the core (5) is excited is
A closed loop is formed via the disk (4) and both end faces (5a) and (5b).

At this time, since the gap between the armature (6) and the end surface (5a) is sufficiently smaller than the thickness of the disc (4), the armature (6) is attracted to the end surface (5a), Has been pulled apart.

Further, since the magnetic flux φ passing through the disk (4) generates an eddy current in the disk (4) and realizes a damping function during rotation, a sharp rotation speed change does not occur during operation.

On the other hand, when operating the brake, switch (11)
Is released, the power source (10) is disconnected from the coil (9), and the core (5) is demagnetized. This allows the armature (6)
Is released from the end surface (5a) and pressed against the surface of the disk (4) by the compression spring (8), so that the disk (4) and the rotating shaft (3) stop.

As described above, since the solenoid including the core (5) and the coil also has the damping function, the space for the conventional permanent magnet for damping is unnecessary, and the device can be downsized.

In the above embodiment, the armature (6) is attached to both end faces (5
Although the case where it is provided in a) and (5b) is shown, it goes without saying that the same effect can be obtained even when it is provided only on one end face, for example, (5a).

[Advantages of the Invention] As described above, according to the present invention, a core having end faces facing both surfaces of a disk, an armature made of a magnetic material and provided on at least one of the end faces so as to be movable in the axial direction of the core, It is equipped with a biasing means for biasing the armature toward the disc surface, and a coil for exciting the core so as to pull the armature away from the disc surface against the biasing force of the biasing means. , The core is excited to separate the armature from the disc, and the magnetic flux passing through the disc realizes a damping function.The brake is demagnetized to urge the armature toward the disc surface. There is an effect that a small-sized brake device having a function can be obtained.

[Brief description of drawings]

 The drawings are side views showing an embodiment of the present invention. (3) …… Rotary axis, (4) …… Disk (5) …… Core, (5a), (5b) …… End face (6) …… Armature (8) …… Compression spring (biasing means) ( 9) ... coil The same reference numerals in the drawings indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A disk made of a non-magnetic material provided on a rotary shaft, a core having end surfaces facing both surfaces of the disk, and at least one of the end surfaces movably provided in the axial direction of the core. An armature made of a magnetic material, an urging means for urging the armature toward the disk surface, and the core for separating the armature from the disk surface against the urging force of the urging means. A braking device including a coil for exciting.