JPS6049773B2 - Reversible electromagnetic coupling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a reversible electromagnetic coupling device that switches between forward and reverse rotation on one output shaft by selectively applying voltage to a pair of electromagnetic coils. It is related to.

A conventional reversible electromagnetic coupling device has a pair of electromagnetic coils arranged facing each other on a single output shaft, and an armature that can freely rotate integrally with the output shaft and move in the axial direction at the midpoint between the two electromagnetic coils. An external force was input directly to this armature.

This armature rotates the output shaft in the normal or reverse direction by magnetically attracting either a forward rotation rotor or a reverse rotation rotor provided between the two electromagnetic coils. Furthermore, either the forward rotation rotor or the reverse rotation rotor is fixed directly to the output shaft, while the other has a gear fixed concentrically, and the gear is fixed to the output shaft via an even number of intermediate gears. The output shaft can be rotated in reverse by meshing with the gears or by interposing a planetary gear mechanism. Therefore, when using this reversible electromagnetic coupling device as a device that transmits torque for forward motion and double motion to a driven device from the driving machine side, it is possible to achieve the desired quick return by changing the gear ratio of the gears. This makes it possible to obtain speed and is extremely convenient.

However, if the armature, which is magnetically attracted by a pair of electromagnetic coils facing each other at a distance, is a transmission member such as a gear that directly inputs power from the outside, in order to smoothly perform axial movement, it is necessary to A large capacity electromagnetic coil is required,
It is difficult to downsize and compact, and in particular, since it is forced to move in the axial direction while constantly being subjected to torque, it is prone to uneven wear and noise.

The present invention is based on the above-mentioned viewpoints and provides a reversible electromagnetic coupling device that does not have the above-mentioned drawbacks, in which an armature that is magnetically attracted to a pair of electromagnetic coils is supported on an output shaft so as to be freely rotatable. and consists of two pieces that fit into both sides of a monovalent input rotating member to which external power is transmitted from the outer periphery, so that it can freely rotate together with the input rotating member, and can be independently displaced in the axial direction. It is distinctive in that it did so.

Next, the reversible electromagnetic coupling device of the present invention will be explained by way of embodiments with reference to the drawings. The drawing shows an embodiment of the reversible electromagnetic coupling device of the present invention in a side view with half longitudinally cut away.

As shown in the drawings, the reversible electromagnetic coupling device of the present invention includes:
A pair of electromagnetic coils 2 and 3 are provided with their axes centered on the axis of one output shaft 1. The electromagnetic coils 2 and 3 are housed in annular grooves 6 and 7 of field cores 4 and 5, respectively.

The field cores 4 and 5 are fixing members arranged so that the annular grooves 6 and 7 face each other with a space between them.

At a central position between the electromagnetic coils 2 and 3, a pulley 8 serving as an input rotating member is supported on the output shaft 1 via a bearing metal 9 so as to be freely rotatable.

The pulley 8 receives external power via the belt 10 and is rotated without moving from a constant position. Between the pulley 8 and the electromagnetic coils 2 and 3, there are a flange portion 11A of the forward rotation rotor 11 and a flange portion 12 of the reverse rotation rotor 12, respectively.
I have A facing me. The forward rotation rotor 11 is fixed to the output shaft 1 by a key 13, but the reverse rotation rotor 12 is freely rotatable.

The outer periphery of the boss portion 12B of the reversing rotor 12 is the gear 1.
4. The gear 14 is connected to the shaft 1 on the frame 15.
The intermediate gear 17 on the small diameter side of the two-stage intermediate gear 17 loosely fitted in
The large-diameter intermediate gear 17B, which is always in mesh with the gear A, is meshed with a gear 19 fixed on the output shaft 1 via an intermediate gear 18 that is loosely fitted to a shaft on a frame (not shown).

On the other hand, concentric annular recesses 20 and 21 are formed symmetrically on both sides of the pulley 8.

The recesses 20 and 21 have concave and convex portions 20A and 21A in the shape of internal gears or spline holes, respectively, on the inner circumferential surfaces of the outer diameter sides. Armatures 22 and 23 made of annular plates made of magnetic material are inserted.

The armatures 22 and 23 both have the uneven portion 20A.
, 21A, and when a voltage is applied to the electromagnetic coil 2, the armature 22 engages with the flange portion 11A of the rotor 11 for normal rotation.
When the armature 23 comes into frictional contact with the friction member 24 embedded in the flange portion 12A of the reversing rotor 12 and a voltage is applied to the electromagnetic coil 3, the armature 23 contacts the friction member 24 embedded in the flange portion 12A of the reversing rotor 12
It is designed to come into frictional contact with 5.

A magnet 26 is embedded between the recesses 20 and 21 in the pool 1J8.

This magnet 26 is arranged so that the armatures 22 and 23 do not stray within the recesses 20 and 21 when neither of the electromagnetic coils 2 and 3 is energized, that is, in a neutral state where no output is generated. It has the function of fixing.
The reversible electromagnetic coupling device of the present invention having the above-mentioned configuration has the following features:
External power is transmitted through the belt 10, and the pulley 8 continues to rotate at a fixed position on the output shaft 1 at all times. When voltage is applied to the electromagnetic coil 2 in this state, a magnetic flux is generated across the field core male forward rotation rotor 11 and the armature 22, the armature 22 comes into frictional contact with the friction member 24 of the forward rotation rotor 11, and the external power is transferred to the belt. 10,
The signal is transmitted to the output shaft 1 via the pulley 8 and the rotor 11 for normal rotation, and the output shaft 1 rotates in the normal direction.

At this time, the armature 23 on the opposite side is also pulled in the direction of displacement of the armature 22 which is magnetically attracted by the energization of the electromagnetic coil 2, and is positioned at the innermost part of the recess 21 to become a friction member of the reversing rotor 12. It's definitely far from 25.

Next, when a voltage is switched and applied to the electromagnetic coil 3, a magnetic flux is generated across the field core 5, the reversing rotor 12, and the armature 23, and the magnetic flux that existed on the field core 4 side disappears.

Therefore, the armature 23 is strongly pulled in the direction of the reversing rotor 12 and comes into frictional contact with the friction member 25, so that external power is transmitted to the output shaft via the belt 10, pulley 8, reversing rotor 12, intermediate gears 17 and 18. 1, and the output shaft reverses.

At this time, the armature 22 , which has already been de-energized by the electromagnetic coil 2 , moves in the direction of displacement of the armature 23 and comes to be located at the innermost part of the recess 20 , causing friction between the forward rotation rotor 11 and the armature 22 . It is kept reliably separated from the member 24.

In addition, in the above embodiment, the input rotating member was a pulley, but
This may be a gear that does not move in the axial direction.

As is clear from the above description, in the reversible electromagnetic coupling device of the present invention, the pulley as an input rotating member that inputs external power does not move in the axial direction, and either of the two armatures built into the pulley By selectively energizing a pair of electromagnetic coils, they are selectively magnetically attracted to the rotors for forward rotation and reverse rotation, and the torque for forward or reverse rotation is transmitted to one output shaft. All of them have the excellent advantage of being extremely lightweight and reliably preventing occurrence of uneven wear, noise, etc.

[Brief explanation of drawings]

The drawing is a side view showing a half section of an embodiment of the reversible electromagnetic coupling device of the present invention. In the drawing, 1... Output shaft, 2, 3...
...Electromagnetic coil, 4, 5...Field core, 8...
... Pooh 18 11 ... Forward rotation rotor, 12.
...Reversing rotor, 20, 21... Recess, 22, 23
... Armature, 24, 25 ... Friction member, 26 ... Magnet.

Claims (1)

[Claims] 1. An input rotating member is disposed at the midpoint between a pair of electromagnetic coils that face each other with a gap between them, and is supported on an output shaft so as to freely rotate, and to which external power is transmitted from the outer periphery. A forward rotation rotor that can freely rotate integrally with the output shaft and a reverse rotation rotor that can freely rotate in reverse relative to the output shaft are provided between the pair of electromagnetic coils, and the input rotation member A reversible electromagnetic coupling device which incorporates two armatures on both sides of the input rotating member, each of which can freely rotate together with the input rotating member and can be independently displaced in the axial direction.