JPS6134007B2 - - Google Patents

Abstract

PURPOSE:To decrease weight of an electromagnetic spring brake, by using a braking coil spring partially as a magnetic flux circuit generated from voltage applied to an electromagnetic coil. CONSTITUTION:A coil spring 25 of square shaped section is interposed between a bottom part 13A of a cubic body 13 housing an electromagnetic coil and an armature 20. To stop driving motion of a rotary shaft when a power source circuit is opened, application of voltage is simultaneously suspended to the electromagnetic coil 1, then magnetic flux disappears to demagnetize the armature 20. Accordingly, the armature 20 strongly presses a friction plate 21 to a mounting plate 16 to block its racing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention presses a friction plate that rotates integrally with a rotating member against a stationary plate-like member by the elastic pressing force of a coil spring, thereby mainly braking the rotating member when the power is interrupted. This relates to the electromagnetic spring brake that has made this possible.

A conventional electromagnetic spring brake, as shown in the side view of the upper half of the brake in FIG. Mounting plate 4
An annular plate-shaped armature made of a magnetic material is fixed using collars 5 and bolts 6, and is movable in the axial direction using the collars 5, which are usually provided at three equally divided positions in the circumferential direction, as a guide. 7 is magnetically adsorbable to the field core 3, and is mounted in the center hole 8 of the field core 3 with its ends abutting near the inner peripheral edge of the armature 7 and the inward flange 3A of the field core 3. The armature 7 is pushed in the direction of the mounting plate 4 by the elastic pressing force of the coil spring 9 inserted therein.

An annular friction plate 10 is provided between the armature 7 pressed by the coil spring 9 and the mounting plate 4.
The friction plate 10 is spline-fitted to a flange 11A of a hub 11, which is a rotating member fixed to a rotating shaft (not shown).

The bolt 6 has a hexagonal hole in its head, and is inserted into the hole 12 of the lug 3B provided at three equally divided positions on the outer periphery of the field core 3.

In this conventional electromagnetic spring brake, when a voltage is applied to the electromagnetic coil 1, a magnetic flux Φ is generated from the field core 3 to the armature 7, and resists the elastic pressing force of the coil spring 9 to move the armature 7 from the field core. Because it is magnetically attracted to 3,
The distance between the armature 7 and the mounting plate 4 is increased, and the friction plate 10 is no longer restrained, so that the rotating shaft (not shown) integrated with the hub 11 becomes free.

This state, that is, the state in which the electromagnetic coil 1 is energized, makes the rotating shaft free, so for example, energizing a clutch member (not shown) that transmits the driving force to the rotating shaft and energizing the electromagnetic coil 1 If both are performed using the same circuit, friction plate 1
The rotation axis can be activated simultaneously with the release of the zero constraint.

Next, when the power to the electromagnetic coil 1 is stopped,
The magnetic flux Φ disappears, and the armature 7 is demagnetized and becomes able to separate from the field core 3, so the armature 7, which is being pushed by the coil spring 9, is pushed forward in the axial direction using the collar 5 as a guide, and the friction The plate 10 is clamped between the mounting plate 4.

When the friction plate 10 is clamped, the rotation of the hub 11, which is a rotating member, is restricted, and a brake is applied to the rotating shaft.

If the power supply circuit for the electromagnetic coil 1 and the rotary shaft drive source is shared, a braking force will be applied the moment the application of driving force to the rotary shaft is stopped, and unnecessary idling of the rotary shaft will be prevented. become.

As described above, electromagnetic spring brakes have the excellent advantage of being able to absorb inertia of rotating members only by opening and closing the power supply circuit, but they require a large number of man-hours to manufacture the field core, which is a large member.
There was also a large amount of material waste, which was a bottleneck in efforts to make the process more economical.

Based on the above-mentioned viewpoints, the present invention provides an electromagnetic spring brake that has a simple structure and can be manufactured economically, especially since the field core can be made of a pressed plate product. An electromagnetic coil is housed in a casing made of a magnetic material that faces the inside of the electromagnetic coil, and a coil spring made of a magnetic wire with a rectangular or rectangular cross section is inserted along the inner diameter of the electromagnetic coil. is in contact with the inner bottom surface of the housing and an armature inserted between the housing and the fixing member, and a friction plate is inserted between the armature and the fixing member, and the coil The feature is that the spring is part of the magnetic circuit.

Next, the electromagnetic spring brake of the present invention will be described by way of embodiments with reference to the drawings.

FIG. 2 shows an embodiment of the electromagnetic spring brake of the present invention in a side view of the upper half of the brake. As shown in the drawings, the casing 13 made of a magnetic material such as a silicon steel plate that houses the electromagnetic coil 1 is a product manufactured by drawing and shearing, and has a center hole 14 in the bottom 13A and an opening in the peripheral wall 13B. An outward facing flange 13C is formed at each end, and a lug 13D formed by extending a part of the flange outward is formed at three equal angle division positions in the circumferential direction of the flange 13C. has screw hole 1
5 is provided.

The housing 13 has a mounting plate 16 as a fixing member.
It is fixed with a bolt 18 via a collar 17, and a predetermined distance is maintained between it and the mounting plate 16.

The bolt 18 is inserted into a hole 19 on the side of the mounting plate 16 that directly faces the screw hole 15 of the casing 13, and
7 is fitted onto a bolt 18 inserted into the hole 19.

The bolts 18 are screwed into the screw holes 15, and have hexagonal holes in their heads.

The housing 13 and the mounting plate 16 are connected by the collar 17.
In the gap formed between the armature 20
and a friction plate 21 are inserted, and the armature 20
The notch 22 of the lug 20A provided on the outer periphery is engaged with the collar 17 so that it is movable only in the axial direction.

The friction plate 21 is spline-fitted to a flange 24A of a hub 24 which is fixed to a rotating shaft (not shown) through a set screw 23 and a key (not shown).

The armature 20 is an annular plate-shaped member made of a magnetic material such as a silicon steel plate with lugs 20A provided at triangularly divided positions on the outer periphery, and a central hole in the housing 13 having an inner diameter smaller than the inner diameter of the electromagnetic coil 1. The diameter is approximately the same as that of No. 14.

A coil spring 25 having a rectangular cross section is interposed between the bottom 13A of the housing 13 and the armature 20.

The coil spring 25 serves as a path for the magnetic flux Φ generated by applying voltage to the electromagnetic coil 1, and enables the armature 20 to be magnetically attracted to the housing 13, while pressing the armature 20 during demagnetization.
Forcefully press the friction plate 21 against the mounting plate 16.

In the electromagnetic spring brake of the present invention configured as described above, when a voltage is applied to the electromagnetic coil 1, the magnetic flux Φ flows from the bottom 13A of the housing 13 to the peripheral wall 13B,
The force is generated through the armature 20 and the coil spring 25, and the armature 20 is magnetically attracted to the housing 13.

When the armature 20 is magnetically attracted to the housing 13 side, the friction plate 21 is attached to the mounting plate 16 and the armature 2.
0 and becomes free, the hub 24,
That is, the rotating shaft (not shown) to which the hub is fixed can freely rotate.

Therefore, if the power supply circuit for the drive source of the rotary shaft is made common to the source circuit for the electromagnetic coil 1, the friction plate 21
is released from captivity.

Next, when the power supply circuit is opened in an attempt to stop the drive of the co-rotating shaft, the voltage application to the electromagnetic coil 1 is simultaneously stopped, the magnetic flux Φ disappears, and the armature 20
is demagnetized, so the armature 20, which is under the elastic pressure of the coil spring 25, strongly presses the friction plate 21 against the mounting plate 16 to prevent it from idling and slightly separates from the flange 13C of the housing 13. .

Armature 20 and flange 13C at this time
The thickness and other dimensions of each member are determined so that the gap between the two parts is usually about 0.3 mm.

As is clear from the above description, the electromagnetic spring brake of the present invention uses a coil spring for braking as part of a magnetic flux circuit generated by applying voltage to an electromagnetic coil, so it is manufactured by conventional forging or casting. Furthermore, the weight can be significantly reduced compared to electromagnetic spring brakes that use a machined annular field core, and since the housing that replaces the feed core is a product made from pressed plate material, This provides excellent effects such as a significant reduction in manufacturing steps, simplification of processing, and savings in material costs, resulting in inexpensive manufacturing.

[Brief explanation of the drawing]

FIG. 1 is a side view of an example of a conventional electromagnetic spring brake, with the upper half taken longitudinally; FIG. 2 is a side view of an embodiment of the electromagnetic spring brake of the present invention, with the upper half taken longitudinally. be. In the drawings, 1... Electromagnetic coil, 13... Housing, 16... Mounting plate, 17... Collar, 18... Bolt, 20...
... Armature, 21 ... Friction plate, 24 ... Hub, 25 ... Coil spring, Φ ... Magnetic flux circuit.

Claims (1)

[Claims] 1. An electromagnetic coil is housed in a circular housing made of magnetic material that faces the fixed member at intervals, and a coil spring made of wire made of magnetic material with a rectangular or rectangular cross-section is inserted along the inner diameter of this electromagnetic coil. death,
Both ends of this coil spring are brought into contact with the inner bottom surface of the casing and an armature inserted between the casing and the fixing member, while a friction plate is inserted between the armature and the fixing member. Then,
An electromagnetic spring brake characterized in that the coil spring is part of a magnetic flux circuit.