JP2564716Y2 - Vertical electromagnetic brake / clutch wear reduction device - Google Patents

Description

The present invention relates generally to a vertical electromagnetic brake and clutch, and more particularly to a vertical electromagnetic brake and clutch used for holding operation.

[Prior Art] In a vertical electromagnetic brake, when the brake is released, the disc is pressed against the frictional contact surface of the mating member due to its own weight, so that the friction plate is worn out quickly, or inconveniences such as heat generation are caused. .

An inexpensive device with a simple structure that solves this problem is shown in FIG.
That is, an annular yoke 2 concentric with the rotating shaft 1 connected to the load is fixed to an appropriate stationary portion (not shown) so as not to rotate. An annular armature 4 is opposed to magnetic pole surfaces A and B formed by the excitation wire loop 3 inserted into the yoke 2 with a gap G therebetween, and a plurality of through holes 5 are arranged at an edge of the armature. Guide pins 6 installed and fixed to the yoke 2
And the armature 4 moves parallel to the axial direction XX of the device.

On the opposite side of the armature 4 from the magnetic pole surfaces A and B, a disk 8 having friction plates 10 and 11 fixed to both sides thereof is provided with an annular braking plate 7 fixed to the cylindrical portion 2 'of the yoke 2 and an armature. 4 are provided. The boss 9 of the disk 8 is in spline engagement with the outer periphery of the rotating shaft 1.
13 adjusts the gap g with the upper end of the rotating shaft 1.

In FIG. 3, the disk 8 having the friction plates 10 and 11 mounted between the armature 4 and the brake plate 7 is clamped by the brake spring 15 so that no current flows in the exciting wire 3 and the disk 8 rotates. This shows a state in which the shaft 1 is being braked. When a current flows through the wire 3, the armature 4 is attracted by the magnetic flux F, the gap G becomes zero, and the disk 8 also loses its weight by its own weight.
With the adjustment screw 12, but the gap g
Only moves.

That is, a gap of a total of G-g is generated between the friction plate 10 and the armature 4 and between the friction plate 11 and the brake plate 7, so that g is appropriately selected so that the gap is equally divided, and wear of the friction plate is extremely reduced. Can be reduced.

[Problem to be solved by the invention] In the electromagnetic brake used for holding action in recent years, the stroke of the armature becomes extremely small, for example, it may be set to about 0.1 mm, and both sides of the friction plate fixed to both sides of the disk It must be said that it is almost impossible to set the disk so that a gap is generated due to the processing accuracy. On the other hand, the vertical type has a problem that the disc is pressed against the armature by its own weight, and the friction plate is greatly worn during idling.

[Means for Solving the Problems] According to the present invention, when the armature is attracted by the magnetic attraction force generated by the excitation of the excitation wire loop, the disk and the friction plates integrally provided on both surfaces of the disk are provided. A release spring having a spring force substantially equal to the total weight of the disk and the friction plate integral with the disk floats between the armature and the brake plate to reduce the contact pressure on both surfaces of the disk with the friction plate to zero or extremely small. This solved the problem.

[Operation] When the attracted force by the excitation acts to release the coupled state of the disks, the release spring causes the disks to float between the armature and the brake plate, resulting in a zero gravity state. Therefore, even if the disc comes into contact with the armature or the brake plate during idling, the disc is not pressed, so that almost no torque is generated and, therefore, wear is extremely small.

[Embodiment] An embodiment of a "vertical electromagnetic brake / clutch wear reduction device" according to the present invention will be described below with reference to FIGS. 1 and 2. FIG.

As shown in FIGS. 1 and 2, the vertical electromagnetic brake / clutch wear reducing device according to the present invention comprises a rotating shaft 1, a yoke 2 having a built-in exciting wire, and an armature 4.
A boss 19 slidable in the axial direction of the rotating shaft 1 through a spline, a disk 18 slidable in the axial direction of the boss 19 through a spline,
A release spring 20 interposed between the flange portion 19 'of the disk 19 and the disk 18; and friction plates 10 and 11 on both surfaces of the disk 18 are friction surfaces against the armature 4 or the brake plate 7, respectively. In a vertical electromagnetic brake / clutch of the type used as

Next, a first embodiment and a second embodiment will be described.

FIG. 1 is a half sectional view of a first embodiment of a wear reducing device for a vertical electromagnetic brake according to the present invention. For the sake of clarity and simplicity, the parts which have the same function as in the prior art device shown in FIG. 3 are given the same reference numbers and only the differences are described.

A boss 19 that is spline-engaged with the outer periphery of the end of the rotating shaft 1
The outer periphery of the boss 19 is spline-engaged with the disc 18 and is fixed to the rotating shaft 1 with a set screw (not shown) perpendicular to the central axis XX.
A release spring 20 is disposed between the release spring 20 and the release spring 20.
Is substantially equal to the total weight of the disc 18 and the friction plates 10 and 11, and when the armature 4 is attracted downward by the exciting force,
The disk 18 is raised.

As shown in FIG. 1 or FIG. 2, the release spring 20 has a base end engaged with the upper surface of the flange portion 19 'of the boss 19 and the other end engaged with the lower surface of the disk 18. The intermediate portion is wound around the outer periphery of the body of the boss 19. Note that, for simplicity, only one spline of the rotating shaft 1 is shown, and the other is omitted.

In the second embodiment shown in FIG. 2, the armature 4, the yoke 2 and the like are located on the upper side of the disk 18 opposite to the release spring 20, but the operation is the same as in the first embodiment.

[Effect of the Invention] When the armature stroke is extremely small, the disc is lifted by the release spring to make it zero-gravity, so even if the disc contacts the armature or the brake plate, there is no pushing force, so almost no idling torque is generated. Without
Therefore, wear of the friction plate can be extremely reduced.

The above description has been made with respect to the vertical electromagnetic brake. However, the electromagnetic clutch has the same operation as the brake, except that the yoke 2 is not fixed and is connected to another rotating body. Can be said.

[Brief description of the drawings]

FIG. 1 is a half sectional view of a first embodiment of a wear reducing device for a vertical electromagnetic brake according to the present invention, FIG. 2 is a half sectional view of a second embodiment, and FIG. 3 is a conventional vertical electromagnetic brake. FIG. (Explanation of reference numerals) 1 ... rotating shaft 2 ... yoke 2 '... cylinder part 3 ... excitation wire ring 4 ... armature 5 ... through hole 6 ... guide pin 7 ... brake plate 8 Disc, 9 Boss 10 Friction plate, 11 Friction plate 12 Adjustment screw, 13 Locknut 14 Braking spring, 15 Hole 18 Disc, 19 Boss 19 ': Flange, 20: Release spring A, B: Magnetic pole surface, F: Magnetic flux F': Leakage magnetic flux, G, g: Gap XX: Central axis

Claims (1)

(57) [Scope of request for utility model registration] 1. A yoke having a rotating shaft and an excitation wire loop built therein.
An armature, a brake plate, a boss slidable on the rotating shaft in an axial direction via a spline, a disk slidable on the boss in an axial direction via a spline, and a flange portion of the boss. A vertical electromagnetic brake having a release spring interposed between the disk and the disk, and using friction plates integrally provided on both surfaces of the disk as friction surfaces for the armature or the braking plate, respectively.
In the clutch, the release spring has a base end engaged with the upper surface of the flange portion of the boss, and the other end engaged with the lower surface of the disk,
The intermediate portion is wound around the outer periphery of the body of the boss and has a spring force substantially equal to the total weight of the disk and the friction plate integral with the disk, and the friction plate of the disk and the armature or the brake The disk and the friction plate integral with the disk are lifted between the armature and the braking plate when the disk is disengaged from the plate, so that the contact pressure on both surfaces of the disk becomes zero or small. A vertical electromagnetic brake / clutch wear reduction device.