JPH087151Y2 - Negative-acting electromagnetic coupling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a negative actuation type electromagnetic coupling device such as an electromagnetic clutch or an electromagnetic brake that releases torque transmission when an electromagnetic coil is excited.

[Conventional technology]

Electromagnetic coupling devices are classified into positive-acting type and negative-acting type depending on whether torque is transmitted or released when the electromagnetic coil is excited. Of these, negative-acting type electromagnetic coupling devices are, for example, actually opened. It is constructed as disclosed in Japanese Laid-Open Patent Publication No. 59-67634. A case where this is used as an electromagnetic brake will be described as an example.A field core in which an electromagnetic coil is installed is fixed to the device fixing portion, and a side plate is provided on the magnetic attraction surface side of the field core. It is supported by a plurality of bolts at a predetermined distance from the magnetic attraction surface. Between the field core and the side plate, an armature biased in the direction away from the field core by a compression coil spring and a disc supported by a hub on the rotating shaft side via a leaf spring field the armature. Facing on both sides of the disk, which is located on the core side and is urged to the field core side by the leaf spring, has a certain spacing between the armature and the side plate when the electromagnetic coil is excited. Are affixed so that they are formed. In addition, the disc is restricted by the part of the hub so that it can move to the armature side. The leaf spring is formed in a gentle S-shape in cross section, and is given an initial displacement equal to or more than thermal strain generated during heat treatment molding.

With this configuration, when the electromagnetic coil is excited while the rotating shaft is rotating, magnetic flux is generated, and the armature resists the elastic force of the compression coil spring and moves toward the field core side. It is magnetically attracted and the disc is urged to the armature side by the spring force of the leaf spring, but the disc has a movement limit regulated by a part of the hub and a gap is formed between the disc and the armature. The rotating shaft continues to rotate with the disc.

When the electromagnetic coil is de-energized from this state, the armature moves to the side plate side by the elastic force of the compression coil spring and contacts the disc, and the disc moves to the side plate side against the spring force of the leaf spring. Then, since the armature and the fixed side plate are strongly sandwiched, the rotating shaft is braked and stopped through the disc and the hub.

[Problems to be solved by the device]

However, in such a conventional electromagnetic coupling device, when it is attached to a device to be braked, before fixing the hub to the rotating shaft, the gap between the facing on the hub side and the armature, and the facing and the side. Since the clearance between the plate and the plate must be adjusted, it is difficult to work in a narrow space, which requires skill.

The present invention has been made in view of the above points. An object is to provide an actuated electromagnetic coupling device.

[Means for solving the problem]

In order to achieve such an object, according to the present invention, a negative actuation type electromagnetic coupling device having a disk fixed to a free end of a leaf spring having a base end fixed to the hub is supported by the hub. A stopper plate is provided which elastically deforms by an external operation and which regulates the receding limit on the free end side of the leaf spring.

[Action]

For example, in the case of an electromagnetic brake, if the electromagnetic coil is excited while the rotating shaft is stopped, the armature is magnetically attracted to the field core side and the disc is urged to the armature side by the spring force of the leaf spring. However, since the movement limit of the disc is restricted by the stopper plate and a gap is formed between the disc and the armature, the rotating shaft rotates together with the disc.

When the electromagnetic coil is de-energized from this state, the armature moves to the side plate side by the elastic force of the compression coil spring and contacts the disc, and the disc moves to the side plate side against the spring force of the leaf spring. Then, since the armature and the fixed side plate are strongly sandwiched, the rotating shaft is braked and stopped through the disc and the hub.

In the electromagnetic brake that operates in this way, when it is mounted on a device and the stopper plate is elastically deformed by rotating the adjusting screw or the like, the retreat limit of the leaf spring is adjusted and the leaf spring is initially preset. The position is given.

〔Example〕

1 to 3 show an example in which the negative actuation type electromagnetic coupling device according to the present invention is applied to an electromagnetic clutch, and FIG.
FIG. 2 is a sectional view taken along the line II of FIG. 2, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. In the drawing, an annular electromagnetic coil 4 connected to a power source (not shown) by a lead wire 3 is provided inside the annular groove 2a of the field core 2 fixed to the device fixing portion 1. A rotor 6, which is key-fixed to the input shaft 5, is rotatably supported on the inner circumference by a bearing 9 whose axial movement is restricted by snap rings 7 and 8. Reference numeral 10 denotes an annular side plate, which is supported at a predetermined distance from the rotor 6 by bolts 11 which are planted at positions that divide the outer peripheral portion of the rotor 6 into three equal parts in the circumferential direction. A guide pin 12 is planted at a position that divides the outer peripheral portion of the rotor 6 into three equal parts in the circumferential direction, and is inserted into a hole of the side plate 10.
Reference numeral 13 denotes an armature which is formed in an annular shape and is interposed between the rotor 6 and the side plate 10. The armature 13 has an outer peripheral hole 13a slidably fitted with the guide pin, and the groove 13b has a groove 13b. Have been engaged in. Also this armature
13 is a compression coil spring loaded in the spring hole of the rotor 6.
It is urged by 14 in the direction away from the rotor 6.
Denoted at 15 is a demagnetizing member which is embedded in the rotor 13 and blocks passage of magnetic flux generated by the excitation of the electromagnetic coil 4.

On the other hand, a hub 17 is fixed to an output shaft 16 concentric with the input shaft 5, and a leaf spring 18 formed in a circular plate shape, a washer 19 and a stopper plate 20 described later are superposed on the hub 17. The plate spring 18 is provided with a plurality of slits 18a. A ring-shaped core plate 22 is fixed to the outer circumference of the leaf spring 18 by welding or tacking.
A pair of annular facings 24 and 25, which form 23, are attached. The stopper plate 20 is formed in a substantially triangular plate shape, and the apex portion of the triangle faces the proximal end portion of the leaf spring 18, and the leaf spring is displaced by its own spring force.
It is configured to regulate the receding limit of the 18 free ends. An adjusting bolt 26 is screwed into each of screw holes provided in the outer circumferential portion of the hub 17 in the circumferential direction so as to be in contact with the free end of the stopper plate 20. The stopper plate 20 is elastically deformed by advancing and retracting it, and the rear end limit of movement of the leaf spring 18 is adjusted. Reference numeral 27 is a nut for fixing the adjusting bolt 26 at the adjusting position.

The operation of the negative operation type electromagnetic clutch configured as above will be described. If the electromagnetic coil 4 is excited while the input shaft 5 is rotating, magnetic flux is generated and the armature 13
Is magnetically attracted to the rotor 6 side against the elastic force of the compression coil spring 14. At this time, the disk 23 is urged toward the armature 13 by the spring force of the leaf spring 18, but the leaf spring 18 is regulated at the retreat limit by the stopper plate 20. Since a gap is formed between the thing 24 and the side plate 10,
The rotation is not transmitted to the output shaft 16.

When the energization of the electromagnetic coil 4 is released from this state, the armature 13 is caused by the elastic force of the compression coil spring 14 to generate a leaf spring.
It moves to the side plate 10 side against the spring force of 18 and abuts against the disk 23, and the disk 23 moves to the side plate 10 side against the spring force of the leaf spring 18 and moves between the armature 13 and the side plate 10. Since it is strongly sandwiched, the rotation of the rotor 6 is transmitted to the output shaft 16 via the leaf spring 18 and the hub 17.

In the negative operation side electromagnetic clutch that operates in this way, when this is attached to the device, the nut 27 is loosened and the adjustment bolt 26 is rotated, and the stopper plate 20 is elastically deformed and its free end is the axis line. As the leaf spring 18 moves in the direction, and the moving and retracting limit of the leaf spring 18 changes, the gap between the facing 25 and the armature 13 and the gap between the facing 24 and the side plate 10 are adjusted.

In this embodiment, the present invention is applied to the negative actuation type electromagnetic clutch, but it can be applied to the negative actuation type electromagnetic brake in which the rotor is not provided and the side plate is fixed, and the same effect can be obtained. To be The facing of the disc may be attached to the armature and the side plate side.

[Effect of device]

As is apparent from the above description, according to the present invention, in a negative actuation type electromagnetic coupling device, a negative actuation type electromagnetic coupling provided with a disk fixed to a free end of a leaf spring having a base end fixed to a hub side. In the device, by providing a stopper plate which is supported by the hub and elastically deforms by an operation from the outside to adjustably adjust the retreat limit of the leaf spring free end side, the gap between the facing and the facing member is provided. Since the electromagnetic coupling device can be finely adjusted very easily and accurately after mounting it on the equipment, productivity is improved and labor is reduced. Further, since the leaf spring is not directly deformed for adjustment, the leaf spring is not damaged and durability is improved, and the initial state of the leaf spring can be maintained.

[Brief description of drawings]

1 to 3 show an example in which the negative actuation type electromagnetic coupling device according to the present invention is applied to an electromagnetic clutch. FIG. 1 is a sectional view taken along the line I--I of FIG. 2, and FIG. II-II sectional view, third
The figure is a front view of the leaf spring. 10 …… side plate, 13 …… armature, 17 …… hub, 18 …… leaf spring, 20 …… stopper plate, 23 …… disc, 26 …… adjustment bolt.

Claims (1)

[Scope of utility model registration request] 1. A negative actuation type electromagnetic coupling device comprising a disk fixed to a free end of a leaf spring having a base end fixed to a hub side, and elastically deformed by an operation from the outside supported by the hub. A negative actuation type electromagnetic coupling device is provided with a stopper plate that adjustably regulates the retreat limit on the free end side of the leaf spring.