JPH02168030A - Exciting device for electromagnetic coupler - Google Patents

Abstract

PURPOSE:To prevent an exciting coil from being come out of a core to increase quality by providing projections, formed by pressing in the direction of a circular groove, on the internal surfaces opposite to each other in the circular groove of the core with U-shaped cross-section. CONSTITUTION:Projections 25, formed by pressing from the outside, are provided on the internal surfaces opposite to each other in the circular groove 4a of the core 4 of an exciting device 3. A fixing agent 5 is wedged into the core to prevent an exciting coil 6 from being come out from the core 4. In the process before the fixing agent is charged, the multiple projections 25 are formed successively and continuously around the periphery. When a voltage is applied to the coil 6 of an electromagnetic clutch 1 to generate magnetic flux, a drive side rotor 9 and a driven side armature 11 are attracted magnetically to connect the drive side and the driven side magnetically. Thus a compressor 2 is driven according to the rotation of an engine and, when application of voltage onto the coil 6 is stopped, the armature 11 i separated from a rotor frictional surface 9a by a restoring force of a vulcanized rubber 21, and the magnetic connection is canceled to interrupt power transmission.

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to an electromagnetic coupling device such as an electromagnetic clutch or an electromagnetic brake, and in particular to an excitation device incorporated in the device. As is well known, the excitation device incorporated in electromagnetic coupling devices such as clutches and electromagnetic brakes is a system in which an annular groove in the core is filled with a fixing agent such as epoxy resin, and the excitation coil is integrally attached to the core through this fixing agent. It consists of internal installations.

This core is an annular member having a substantially U-shaped cross section, which is made by reshaping a round steel material made of magnetic material into an annular blank and performing cold forging on this blank. The opposing inner surfaces typically form tapered surfaces.

In order to prevent the built-in excitation coil from falling out of the core in such an excitation device, conventionally, an annular groove was cut into the inner surface (tapered surface) of the core (1983-1993). 12594) or by making the inner surface itself rough, the adhesive force between the adhesive and the core was strengthened.

[Problems to be Solved by the Invention] However, with such excitation coil fall prevention means, in the former case, it takes time and effort to process the groove, resulting in poor productivity, and in the latter case, the excitation coil There was a problem in that the anti-dropping effect was insufficient and reliability was lacking in terms of quality.

[Means to solve the problem] The present invention effectively prevents the excitation coil from falling off using simple means. ,.

Prevention□su... target d 1Hilf'1J8v'f shape,
□In an excitation device for an electromagnetic coupling device, in which an excitation coil is internally fixed within an annular groove of a core made of an annular member, via a fixing agent, the annular It is characterized by having a protrusion formed by press extrusion toward the inside of the groove.

[Function] Since the adhesive is wedged by the protrusion protruding from the inner surface of the core, the excitation coil is prevented from falling off from the core.

[Example] Next, an excitation device of the present invention incorporated in an electromagnetic coupling device will be described by way of an example with reference to the drawings.

, FIG. 1 is a sectional view of an electromagnetic clutch for a car cooler incorporating an excitation device according to the present invention, and FIG. 2 is an enlarged sectional view showing a main part of the excitation device of FIG. 1.

1 is an electromagnetic switch for a car cooler, which is attached to the side of a compressor 2, which is a driven machine.

3 is an excitation device incorporated in this electromagnetic clutch, and includes a core 4 made of an annular member having a substantially U-shaped cross section.
An excitation coil 6 is installed inside the annular groove 4a of the core 4 by being fixed with a fixing agent 5 such as epoxy resin.
The flange 7 is welded to the side surface of the core 4 and is fixed to the side surface of the compressor 2 with bolts 8.

The excitation device 3 is loosely inserted into a rotor 9 having a substantially U-shaped cross section, and the rotor 9 has a groove on its outer periphery for receiving external power via a V-belt (not shown). 9b, and is supported by the nose portion 2a of the compressor 2 via a bearing 10 so as to be freely rotatable.

Reference numeral 11 denotes an armature that is disposed opposite to the friction surface 9a of the rotor 9 with a predetermined gap therebetween.

After the serrations are fitted to the shaft 12 of the compressor 2 and the predetermined gap is adjusted with the shim 13, the backing plate 1
4 and an armature hub 16 mounted by bolts 15.
It is supported via a support member 17, allowing movement only in the axial direction.

This support member 17 is formed by filling and solidifying vulcanized rubber 21 into an annular groove 20 formed by overlapping a large-diameter plate 1 member 18 and a small-diameter plate-shaped member 19. .19 and vulcanized rubber 21 are integrated, and the inside thereof is fixed to the flange portion 16a of the armature hub 16 by a rivet 22, while the armature 11 is connected to the vulcanized rubber 21 on the outside thereof.
It is caulked and fixed via a stopper rubber 24 by a rivet 23 fixed in place.

Next, the excitation device 3 will be described in detail with reference to FIG. 2. As shown in FIG. 9, a protrusion 25 formed from the outside by press extrusion is provided on the inner surface facing each other within the annular groove 4a of the core 4. This protrusion B25 prevents the adhesive 5 from coming off and prevents the excitation coil 6 from falling off from the core 4. Here, this protrusion 25 corresponds to the annular groove 4a.
Although the protrusions 25 are provided on the outer inner surfaces facing each other, they may be provided on the inner inner surface or both inner surfaces.In general, these protrusions 25 are formed continuously or completely in the process before filling with the adhesive 5. It is formed continuously around the circumference, and if it is formed in a later process, there is a risk that cracks will occur in the adhesive 5, which is not preferable.

In the electromagnetic clutch 1 having such a configuration, when a magnetic flux is generated by applying a voltage to the excitation coil 6, the rotor 9 on the drive side and the armature 11 on the driven side
The compressor 2 is driven by the rotation of the engine due to the magnetic adsorption between the two and the magnetic coupling between the driving side and the driven side.If the application of voltage to the excitation coil 6 is stopped at this point, the armature 11 is no longer applied. Because it is separated from the friction surface 9a of the rotor 9 due to the restoring force of the sulfur rubber 21.

The magnetic coupling is released and power transmission is interrupted.

FIG. 3 is an enlarged cross-sectional view of the main parts of another exciting device according to the present invention, similar to FIG. 2. In the exciting device 3' shown here, the inner surface of the core 4' is The only difference from the excitation device 3 is that a protrusion 25' as shown in the figure is formed by caulking by press extrusion at the opening of the core 4';
Similarly, the excitation coil 6 is prevented from falling off from the core 4'.

[Effects of the Invention] As is clear from the above description, in the present invention, an excitation coil is internally fixed via a fixing agent in an annular groove of a core made of an annular member having a substantially U-shaped cross section. In the excitation device for an electromagnetic coupling device, the inner surfaces facing each other within the annular groove of the core.

Since the protrusion is press-extruded into the annular groove, the present invention is different from the conventional technique in which the protrusion filled in the groove of the adhesive prevents the adhesive from falling off. Because it is firmly wedged by the protrusion of the core, which effectively prevents the excitation coil from falling off from the core.

In addition to improving reliability in terms of quality, such protrusions can be easily formed by press processing.

An excitation device for an electromagnetic coupling device that is highly productive and inexpensive is provided.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an electromagnetic clutch incorporating the excitation device of the present invention, FIG. 2 is an enlarged cross-sectional view showing the main parts of the excitation device in FIG. In one drawing which is a sectional view similarly showing an enlarged main part of an excitation device of the present invention as an example, 1... Electromagnetic clutch, 3. 3'... Excitation device. 4.4'...core, 5...adhesive agent. 6... Excitation coil, 9... Rotor. 11... Armature, 16... Armature hub. 17... Supporting member, 21... Vulcanized rubber. 25, 25'...protrusion. Figure 1 Figure 2 Figure 3 / 3' 3 4 4a 9a

Claims (1)

[Claims] In an excitation device for an electromagnetic coupling device, in which an excitation coil is internally fixed within an annular groove of a core made of an annular member exhibiting a substantially U-shaped cross section via a fixing agent, the excitation coil is opposed within the annular groove of the core. An excitation device for an electromagnetic coupling device, characterized in that an inner surface is provided with a projection formed by press extrusion toward the inside of the annular groove.