JPS608183Y2 - Electromagnetic coupling device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an electromagnetic coupling device that can automatically adjust the gap.

In general, an electromagnetic coupling device includes an output rotor 3 with a flange portion 2 facing the front surface of an annular field core 1, and a front surface of the output rotor 3, as shown in a longitudinal side view in FIG. It has a buried plate-like armature 4 facing directly across a required gap G, and has one end 5A fixed to the armature 4.The other side of the leaf spring 5 (usually 2 to 3 equally divided plates are used) The end 5B of is fixed to the inlet cover,
By applying a voltage to the electromagnetic coil 7 in the field core 1, the armature 4 is magnetically attracted to the flange portion 2, and torque is transmitted along the path from the input cover to the leaf spring 5 to the armature 4 to the output rotor 3.

Incidentally, a facing 8 as a friction member is attached to the front surface of the flange portion 2 of the output rotor 3 in order to obtain a large frictional force, and since the armature 4 and the facing 8 make and break frictional contact, there is no friction between them. wear occurs.

On the other hand, the leaf spring 5 is bent when the armature 4 is magnetically attracted to the flange part 2, allowing the armature 4 to move in the direction of the flange part 2, and the voltage applied to the electromagnetic coil 7 is released and the magnetic flux disappears. , it acts to pull the armature 4 back toward the incoming cover.

For this reason, the leaf spring 5 is generally referred to as a return spring.

Here, if relative wear has occurred between the flange portion 2 of the output rotor 3 and the armature 4, the gap G will be in an increased state when the armature 4 returns to its original position.

If the increase in the dimension of this gap G exceeds a predetermined value, the magnetic attraction ability of the armature 4 will decrease rapidly, and attraction may become impossible.

Considering that the magnetic attraction force normally decreases in inverse proportion to the square of the distance, an increase in the gap G is extremely harmful and greatly affects the life of the electromagnetic coupling device.

Therefore, various electromagnetic coupling devices that automatically correct the gap G have been developed in the past, but all of them have the disadvantage that they have complicated structures and are prone to failure.

This idea is based on the above points, has a simple structure,
The present invention provides an electromagnetic coupling device with excellent gap adjustment ability, in which a first rotating member and a second rotating member, one of which is on the input side and the other is on the output side, are connected on the axis of the field core or on the axis of the field core. While the armature is arranged with its axes aligned on the extension line, a recess is provided on the rear surface of the armature which magnetically attracts the first rotating member by energizing the electromagnetic coil in the field core, and a through hole bored in the bottom of the recess is provided. , the body of the headed member with the head inserted into the recess should be inserted and held between the head of the headed member and the inner bottom surface of the recess and between the first rotating member and the armature. A gap with a size corresponding to the regular gap size is maintained, and a portion of the headed member is inserted through an armature return plate spring fixed to the armature and a guide hole provided in the second rotating member. A second ring-shaped friction resistance member is fixed to the guide member and is in frictional contact with the outer peripheral surface of the guide member.
The second rotating member is fitted closely to the outer end surface of the rotating member, while maintaining a gap G between the armature and the first rotating member when the armature is demagnetized on the rear side of the second rotating member on the outer periphery of the guide member. It is characterized by the fact that it is fitted with a compression coil spring.

Next, the electromagnetic coupling device of this invention will be explained by way of examples with reference to the drawings.

FIG. 2 is a longitudinal cross-sectional view of half of an embodiment of the electromagnetic coupling device of this invention.

As shown in the drawings, the electromagnetic coupling device of this invention has a flange portion 10A facing the front surface of an annular field core 9, and an output rotor 1 serving as a first rotating member on the output side.
0, and an input rotor 11 as a second rotating member serving as an input side is arranged in front thereof at intervals.

The output rotor 10 has a boss portion 10B supported on the field core 9 by ball bearings 12, 12 so as to be freely rotatable.

The input rotor 11 has a flange portion 11A and a boss portion 11B, and a ball bearing 1 is mounted on the boss portion 10B of the output rotor 10.
3.13, it is supported so that it can freely rotate.

A buried plate-like armature 14 faces the front surface of the output rotor 10 with a predetermined gap G therebetween.

The armature 14 is spline-fitted to the boss portion 11B of the input rotor 11, and is movable in the axial direction on the input rotor 11, which is the second rotating member.

The armature 14 is provided with a recess 15 on the rear side.

The recess 15 has a through hole 16 at the center of the bottom 15A, and the body 17B of the headed member 17 with the head 17A facing the recess 15 is inserted through the through hole 16.

The headed member 17 has a length of the body portion 17B such that when the armature 14 returns to its normal position, a gap g having a size corresponding to the gap G is formed between the head portion 17A and the inner bottom surface 15a of the recessed portion 15. The dimensions are set so that it can be maintained.

On the other hand, the recess 15 of the armature 14 and the input rotor 1
A guide hole 18 is provided at an opposing position in the flange portion 11A of 1.
It is perforated.

A guide member 19 such as a metal pin is inserted through the guide hole 18 .

The guide member 19 has a screw hole 20 into which the male threaded leg portion 17C of the headed member 17 is screwed, and when it is fixed to the headed member 17, the guide member 19 has a screw hole 20 that is screwed into the leg portion 17C of the headed member 17. An armature return leaf spring 21 is sandwiched between them.

Further, the leaf spring 21 has one end fixed to the armature 14, and when the armature 14 is magnetically attracted to the flange portion 10A of the output rotor 10 as a first rotating member by applying a voltage to the electromagnetic coil 22, the leaf spring 21 stores energy. It is a spring that releases its force upon demagnetization to return the armature 14 (displace it to the position shown in the figure).

On the other hand, a compression coil spring 23 is fitted to the outer periphery of the guide member 19 fixed to the headed member 17 on the rear side of the flange portion 11A of the input rotor 11. A friction resistance member 24 is fitted on the end face side.

By fitting the compression coil spring 23, the input rotor 1
Since the friction resistance member 24 fitted to the guide member 19 is always held in close contact with the front side of the flange portion 11A of 1,
The armature 14 fixed to the guide member 19 via the leaf spring 21 is separated from the flange portion 10A of the output rotor 10 by the leaf spring 21 when it is demagnetized, and a gap G is maintained between the armature 14 and the flange portion 10A of the output rotor 10. Head 17 of head member 17
A gap g having a size corresponding to the gap G is maintained between A and the inner bottom surface 15a of the recess 15 of the armature 14.

The frictional resistance member 24 is a snap ring or the like, and is in strong frictional contact with the outer peripheral surface of the guide member 19 in close contact with the flange portion 11A. It is a member that allows movement of the parts and slides relative to each other.

In addition, in this embodiment, the first rotating member is connected to the flange portion 10.
The output rotor 10 has a friction member 25 embedded in A, and the second
Although the rotating member is the input rotor 11, it goes without saying that torque transmission between devices is possible even if the input and output sides are reversed.

In addition, in this embodiment, a pulley (not shown) is fixed concentrically to the input rotor 11 of the second rotating member serving as the input side, so that input is received from an external drive source.
When the output rotor 10, which is the first rotating member, is used as the input side, a groove for hanging a belt may be formed on the outer peripheral surface of the output rotor 10, and this may be used as the input rotor.

In the electromagnetic coupling device of this invention having the above-described configuration, when a voltage is applied to the electromagnetic coil 22, the armature 14
It is magnetically attracted to the output rotor 10, which is a rotating member, and transmits torque from the input rotor 11, which is spline-fitted to each other, to the output rotor 10.

At this time, if the gap G between the armature 14 and the output rotor 10 is a regular size, when the armature 14 comes into contact with the output rotor 10, the head 17 of the headed member 17
The inner bottom surface 15a of the recess 15 comes into contact with A, the gaps G and g both become zero, and the guide member 19 is not moved in the axial direction.

If wear occurs between the armature 14, the flange portion 10A of the output rotor 10, and the friction member 25,
Since the dimension of the gap G has increased, when the armature 14 is magnetically attracted to the output rotor 10, the armature 1
The axial displacement amount of 4 is the dimension 6 plus the amount of wear.

For this reason, the inner bottom surface 15a of the recess 15 pushes the head 17A of the headed member 17 and moves it by a dimension equivalent to the amount of wear, and the guide member 19 is moved by the frictional force between it and the frictional resistance member 24. It will be pulled in the axial direction against the

That is, when relative wear occurs between the armature 14 and the output rotor 10, the guide member 19 is pulled toward the armature in proportion to the amount of wear, so that the guide member 19 is pulled toward the armature by the action of the leaf spring 21 when the armature 14 is demagnetized. When returning to the old position (the position shown), the gap G has automatically returned to its normal size.

As is clear from the above description, the electromagnetic coupling device of this invention has the excellent advantage of being able to always automatically compensate for wear and maintaining the gap between the armature and the output rotor at a regular size.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional side view showing an example of a conventional electromagnetic coupling device.
FIG. 2 is a longitudinal sectional side view showing a half part of an embodiment of the electromagnetic coupling device of this invention. In the drawings, 9...field core, 10...output rotor, 11...input rotor, 14...
・Armature, 15... Concavity, 15A...
...Bottom, 15a...Inner bottom surface, 16...
...Through hole, 17... Headed member, 17A...
...Head, 17B...Torso, 17C...
・Legs, 18... Guide hole, 19... Guide member, 21... Leaf spring, 22... Electromagnetic coil, 24... -Frictional resistance member, 25...Frictional member, G. g... Gap.

Claims (1)

[Scope of claims for utility model registration] One of the first is the input side and the other is the output side.
The rotating member 10 and the second rotating member 11 are arranged so that their axes coincide with each other on the axis of the field core 9, which is a fixed member, or on an extension of this axis, and between the two rotating members 10 and 11, the field core An armature 14 that can be freely displaced in the axial direction and rotated integrally with the second rotating member 11 is arranged at a predetermined interval on the front surface of the first rotating member 10 whose rear face is facing the armature 9. A through hole 16 is bored in the bottom 15A of the recess 15 provided at a fixed position on the rear surface of the rotor 14, and a guide hole 18 is formed in a predetermined position of the second rotating member 11 directly facing the through hole 16.
The body part 17B is inserted into the through hole 16 and the head part 17 is inserted into the guide member 19 which is slidable in the axial direction and which is inserted into the guide hole 18.
A is inserted into the recess 15 so that a gap equivalent to the gap G to be maintained between the first rotating member 10 and the armature 14 can be maintained between the head 17A and the inner bottom surface 15a of the recess 15. Head member 17 and armature return leaf spring 21
Further, a ring-shaped frictional resistance member 24 that makes frictional contact with the outer circumferential surface of the guide member 19 is fitted closely to the outer end surface of the second rotating member 11. the second rotating member 11 on the outer periphery;
An electromagnetic coupling device in which a compression coil spring 23 is fitted on the rear side to maintain a gap G between the armature 14 and the first rotating member 10 when the armature 14 is demagnetized.