JPH02113135A - 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

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a brake device that biases an armature to a disc integrated with a rotating shaft, and particularly relates to a small brake device that also has a damping function during rotation. be.

[Prior Art] Conventionally, in this type of brake device, an armature made of magnetic material is arranged on one side of the disk surface, and while the disk is rotating, the armature is held at a position away from the disk by a solenoid, and the brake is applied. During operation, the solenoid is demagnetized and a biasing means such as a compression spring is used to press the armature against the disk surface.

Further, when the rotating shaft is used in an automatic control device or the like, a permanent magnet is placed close to the disk to provide a damping function in order to prevent the rotational speed from changing suddenly during operation.

[The problem that the invention attempts to solve! ! ! ] As described above, in conventional brake devices, the solenoid for driving the armature is placed only on one side of the disk surface, and the magnetic circuit of the solenoid is closed via the armature, so it achieves a damping function during rotation. In order to do this, it is necessary to place a permanent magnet in the solenoid pond, which poses the problem of increasing the size of the device.

This invention was made to solve the above-mentioned 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 includes a core having end faces facing both sides of a disk, and an armature made of a magnetic material provided on at least one of the end faces so as to be movable in the axial direction of the core. It includes a biasing means for biasing the armature toward the disk surface, and a coil for exciting the core.

[Function] In this invention, while the disk is rotating, the core is energized to pull the armature away from the disk, and a damping function is achieved by the magnetic flux passing through the disk. During braking, the core is demagnetized to move the armature away from the disk. Force the disk surface.

[Embodiment] Hereinafter, an embodiment of the present invention will be explained with reference to the drawings. The drawings are side views showing an embodiment of the present invention.

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

(5) is the end surface (5a) facing both sides of the disk (4)
and (5b). (6) is the end face (5a
) and (5b), respectively, armatures made of a magnetic material such as pure iron and provided movably in the axial direction of the core (5);
7) is a brake shoe attached to the disc (4) side of the armature (6), and (8) is a compression spring (8) for urging the armature (6> toward the surface of the disc (4)).
(biasing means), and only one end surface (5a) side is shown here.

(9) is a coil for exciting the core (5), (10)
is a power source for driving the coil (9), and (11) is a switch that opens and closes one end of the coil (9) to selectively connect the power source (10).

Next, the operation of one embodiment of the present invention shown in the drawings will be explained. Note that since the configurations regarding each end surface (5a) and (5b) are the same, the armature (6
) will be explained only.

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 core (5) is excited and the magnetic flux φ generated within the core (5) is
A closed loop is formed via the disk (4) and both end surfaces (5a) and (5b).

At this time, since the gap between the armature (6) and the end surface (5a) is sufficiently small compared to the thickness of the disk (4), the armature (6) is attracted to the end surface (5a), and the disk (
4) is separated from the surface.

Also, due to the magnetic flux φ passing through the disk (4), the disk (
4) Eddy currents are generated within the motor to achieve a damping function during rotation, so sudden changes in rotational speed do not occur during operation.

On the other hand, when operating the brake, switch (11)
is opened, 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 face (5a), and the compression spring (8
), the disk (4) and rotating shaft (3) stop.

In this way, the solenoid consisting of the core (5) and the coil also serves as a damping function, thereby eliminating the need for the space of the conventional damping permanent magnet.

The device can be made smaller.

In the above embodiment, the armature (6) has both end faces (5a
) and (5b), but it goes without saying that the same effect can be achieved even if it is provided only on one end face, for example (5a).

[Effects of the Invention] As described above, according to the present invention, a core having end faces facing both surfaces of the disk, an armature made of a magnetic material provided on at least one of the end faces so as to be movable in the axial direction of the core; comprising a biasing means for biasing the armature toward the disk surface and a coil for exciting the core,
When the disk is rotating, the core is energized to pull the armature away from the disk, and the magnetic flux passing through the disk provides a damping function. During braking, the core is demagnetized and the armature is urged toward the disk surface. Therefore, it is possible to obtain a compact brake device that also has a damping function.

[Brief explanation of the drawing]

The drawing is a side view showing an embodiment of the present invention. (3... Rotating shaft (4)... Disc (5...
... Core (51), (5b) ... End surface (
6... Armature (8... Compression spring (biasing means) (9... Coil) In the drawings, the same reference numerals indicate the same or corresponding parts. 3: Rotating shaft 4, Tesuku 5: ] A5a, 5b End face 6: Armature 8゛Compression spring (biasing means) 9: Carp J

Claims (1)

[Scope of Claims] A disk made of a non-magnetic material provided on a rotating shaft, a core having end faces facing each other on both sides of the disk, and a core provided on at least one of the end faces so as to be movable in the axial direction of the core. A brake device comprising: an armature made of a magnetic material; urging means for urging the armature toward the disk surface; and a coil for exciting the core.