JPH085385Y2 - Exciting device for electromagnetic coupling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an exciting device for magnetically attracting an armature in an electromagnetic coupling device such as an electromagnetic clutch and an electromagnetic brake.

[Conventional technology]

In an electromagnetic coupling device such as an electromagnetic clutch or an electromagnetic brake, an exciting device for magnetically attracting an armature is conventionally configured as disclosed in, for example, Japanese Utility Model Publication No. 58-8998. That is, the exciting device of the electromagnetic coupling device includes a field core formed in an annular shape having a U-shaped cross section, and the wound electromagnetic coil is housed in the annular groove of the field core while being fixed by resin. A diode as a surge voltage absorbing element is connected to the electromagnetic coil and is housed in the annular groove as well. Then, the lead wire connected to the winding start end and the winding end end of the electromagnetic coil is pulled out from the grommet press-fitted into the through hole of the field core, and then the resin is poured into the annular groove. The electromagnetic coil and the diode are insulated and fixed.

With this configuration, when the electromagnetic coil is excited, the armature is attracted to the magnetic pole surface of the field core, and the rotation of the drive shaft is transmitted to the driven shaft. When the electromagnetic coil is demagnetized from this state, the armature is separated from the magnetic pole surface by the spring force, and the rotation transmission to the driven shaft is released.

If such excitation and demagnetization of the electromagnetic coil is repeated, a high voltage surge voltage is induced at both ends of the winding and the end of the winding when the electromagnetic coil is demagnetized, and the switching in the controller connected to the electromagnetic coil is performed. Although the device contacts are worn away, the surge voltage is absorbed by the diode because the device has a diode.

[Problems to be solved by the device]

However, in such a conventional electromagnetic coupling device excitation device, the lead portion of the diode and both ends of the electromagnetic coil are soldered in the annular groove of the field core, and the case portion of the diode is in the annular groove. Since the electromagnetic coil is stored in a small space, sufficient magnetomotive force cannot be obtained, and if the size of the field core is increased to solve this problem, the annular groove into which the field core is inserted is inserted. When the outer side of the rotor provided with is a pulley groove, there is a problem that the design cannot be changed.

The present invention has been made in view of the above points, and provides an exciter for an electromagnetic coupling device that allows a surge voltage absorbing element to be housed in a field core without reducing the space for housing the electromagnetic coil. Is intended.

[Means for solving the problem]

In order to achieve such an object, according to the present invention, a through hole is provided in a wall portion of a field core in which an annular groove for accommodating an electromagnetic coil is formed, and the through hole is provided with a recess opening toward the annular groove and the recess. A connector holding member having an insertion hole communicating with the outside is press-fitted, and a surge voltage absorption element is housed in the recess, and the lead portion of the surge voltage absorption element and the end of the electromagnetic coil are inserted into the insertion hole. Inserted.

[Action]

After press-fitting the connector holding member into the through hole of the annular groove wall and storing the surge voltage absorbing element in the concave hole of the connector holding member while inserting the lead portion of the surge voltage absorbing element into the insertion hole of the connector holding member, The electromagnetic coil is housed in the annular groove of the field core while the winding start end and the winding end end of the electromagnetic coil are inserted into the inner hole of the connector holding member. Then, the lead portion and the end portion of the electromagnetic coil are cut and aligned at the tip portion of the connector holding member, and then the lead portion and the coil end portion are soldered, whereby the assembling work is completed. By doing so, the surge voltage absorbing element can be housed in the field core without reducing the housing space of the electromagnetic coil.

[Embodiment] FIGS. 1 and 2 (a), (b) and (c) show an example in which an exciting device of an electromagnetic coupling device according to the present invention is applied to an electromagnetic clutch of an automobile compressor. FIG. 2 is a vertical sectional view of the electromagnetic clutch, FIG. 2 (a) is a vertical sectional view of the main part of the exciter, FIG. 2 (b) is a front view, and FIG. 2 (c) is a rear view. In the figure, an electromagnetic clutch 1 includes a field core 4 fixed to a housing 2 of an automobile compressor via a mounting plate 3. The field core 4 is
It is formed in an annular shape having a U-shaped cross section, and in the annular groove 4a of the field core 4, a wound electromagnetic coil 5 is internally provided and insulated and fixed by a resin 62. Also, the housing 2
A rotor 8 having an annular groove 8a, which is crowned in a loosely mounted state on the field core 4 from the opening side, is rotatably supported in the cylindrical portion 7 of the field core 4 via a bearing 9 and its axial movement is supported. ing. On the other hand, a hub 11 formed into a cylindrical shape with a collar is attached to the tip of a drive shaft 10 provided in the compressor and penetrating the cylindrical portion 7, and the drive shaft 10 is fitted with serrations and bolts 12.
The leaf spring 13 fixed to the flange of the hub 11 is attached to the leaf spring 13 by an armature 14 formed in the shape of a ring so that the friction surface 14a faces the friction surface 8b of the rotor 8. It is worn.

The armature 14 is formed of an outer ring member 14c and an inner ring member 14d that are concentrically arranged with an annular gap 14b therebetween.
Are integrated in. A predetermined gap indicated by a symbol G in the drawing is formed between the armature 14 and the rotor 8. Reference numeral 8c is a pulley groove formed on the outer periphery of the rotor 8, which is belt-connected to a pulley provided on the crankshaft of an automobile engine, and is configured to rotate by being driven from the engine side.

Next, the excitation device according to the present invention will be described. An exciting device 20 whose details are shown in FIG. 2 includes a connector housing 21 which is made of a plastic material and constitutes a part of a connector holding member.
The connector housing 21 is press-fitted into a through hole 4b provided at the bottom of the annular groove 4a of the field core 4, and a pair of connectors 22 and 23 formed in a tubular shape and forming a part of a connector holding member are formed in the connector housing 21. It is inserted during molding and protrudes to the outside. The connector housing 21 is provided with a concave hole 21a that opens toward the annular groove 4a, and a diode 24 as a surge voltage absorbing element is housed in the concave hole 21a. The one lead portion 25 and the winding start end portion 26 of the electromagnetic coil 5 are inserted into the inner hole of the connector 22 so that the tip end portion thereof is connected to the connector 22.
It is fixed by soldering, for example. Further, the other lead portion 27 of the diode 24 and the winding end portion 28 of the electromagnetic coil 5 are inserted into the inner hole of the connector 23, and the tip end portion is fixed to the connector 23 by, for example, soldering. As a result, the inner holes of the connectors 22 and 23 are closed by the solder.

The operation of the electromagnetic coupling device configured as described above will be described. Since the electromagnetic coil 5 is connected to an external electric circuit via a connector (not shown) connected to the connectors 22 and 23, the electromagnetic coil 5 is controlled by ON / OFF control of this electric circuit.
When the current is applied to the armature 14, the generated magnetic flux causes the armature 14 to be magnetically attracted to the rotor 8 against the spring force of the leaf spring 13, and the rotation of the rotor 8 rotating together with the pulley driven from the engine side of the automobile causes the rotation of the drive shaft 10. And the compressor is driven.

When the excitation of the electromagnetic coil 5 is released from this state, the magnetic attraction of the armature 14 is released, so the armature 14
Is a friction surface separated from the rotor 8 by the spring force of the leaf spring 13.
A gap G is formed between 14a and 8b, and the rotor 8 drives the drive shaft.
The transmission of rotation to 10 is cut off and the compressor stops.

Next, the assembling operation of the exciting device 20 will be described. First connector
The connector housing 21 in which 22,23 are insert-molded is press-fitted into the through groove 4b on the bottom surface of the annular groove from the annular groove 4a side to project the connectors 22,23 to the outside. Then, while inserting the lead portions 25 and 27 of the diode 24 into the inner holes of the connectors 22 and 23, respectively, the diode 24 is inserted into the concave hole 21a of the connector housing 21.
Then, the electromagnetic coil 5 is housed in the annular groove 4a of the field core 4 while inserting the winding start end portion 26 and the winding end end portion 28 of the electromagnetic coil 5 into the inner holes of the connectors 22 and 23, respectively. To do. Then, the lead portions 25 and 27 and the coil end portions 26 and 28
The connector 22 and 23 at the tips, and then the lead 2
5 and the winding start end portion 26, the lead portion 27, and the winding end end portion 28 are soldered so as to be connected in the recesses 22a and 23a, whereby the assembling work is completed.

After that, when the insulating resin 6 is poured into the annular groove 4a of the field core 4, the resin 6 enters near the tips of the connectors 22 and 23.

3 (a) and 3 (b) show another embodiment of the present invention,
FIG. 3 (a) is a cross-sectional view of the excitation device, and FIG. 3 (b) is an enlarged cross-sectional view of the coupling portion between the coil bobbin and the coil cover. In the figure, members having the same configurations as those of the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted. In this embodiment, the connector housing is formed integrally with the coil bobbin. That is, the coil bobbin 30 is formed in an annular shape having a U-shaped cross section, and the same connector housing 31 as in the above embodiment is integrally formed on the bottom plate of the coil bobbin 30, and the connector 32 is insert-molded in the connector housing 31. The open end of the coil bobbin 30 is closed by a coil cover 33 formed in a ring shape, and this joint is welded by ultrasonic welding. FIG. 3 (b) shows an enlarged cross-sectional view of the welded portion before welding. Since the volume of the fitting portion of the coil cover 33 is made smaller than the volume of the fitting portion of the coil bobbin 30, the coil bobbin 30 is welded. There is no flash from the side edge. The operation and effect are the same as those of the above embodiment.

In the above description, the connector housing 21 is press-fitted into the through hole 4b provided at the bottom of the annular groove of the field core 4. However, for example, when the outside of the field core 2 is not completely covered by the rotor 8, A radial through hole may be provided in the outer peripheral wall portion of the field core 2, and the connector housing 21 may be press-fitted into the through hole.

[Effect of device]

As is apparent from the above description, according to the present invention, a through hole is provided in a wall portion of a field core in which an annular groove for accommodating an electromagnetic coil is formed, and the through hole is provided with a recess opening toward the annular groove and the recess. A connector holding member having an insertion hole communicating with the outside is press-fitted, and a surge voltage absorption element is housed in the recess, and the lead portion of the surge voltage absorption element and the end of the electromagnetic coil are inserted into the insertion hole. By inserting, the surge voltage absorbing element can be incorporated without reducing the electromagnetic coil storage space, sufficient magnetomotive force can be obtained, and both ends of the electromagnetic coil and the lead portion of the surge voltage absorbing element can be connected to the connector. Since these are connected by being fixed at the tip, this connected portion is outside the annular groove of the field core, and the coil space of the electromagnetic coil is reduced. Work can be improved easily and productivity not.

[Brief description of drawings]

1 to 3 show an example in which an exciting device of an electromagnetic coupling device according to the present invention is applied to an electromagnetic clutch. FIG. 1 is a longitudinal sectional view of the electromagnetic clutch, and FIG. 2 (a) is a main part of the exciting device. FIG. 2 (b) is a front view, FIG. 2 (c) is a rear view, and FIGS. 3 (a) and 3 (b) are other embodiments of the present invention. FIG. 3A is a cross-sectional view of the excitation device, and FIG. 3B is an enlarged cross-sectional view of the coil bobbin and the coupling portion of the coil cover. 1 ... Electromagnetic clutch, 4 ... Field core, 4a ... Annular groove, 5 ... Electromagnetic coil, 20 ... Exciting device, 21 ... Connector housing, 21a ... Recessed hole, 22,23 ... Connector, 24
...... Diode, 25,27 ...... Lead part, 26 …… Roll start end, 28 …… Roll end end.

Claims (1)

[Scope of utility model registration request] 1. A through hole is provided in a wall portion of a field core in which an annular groove for accommodating an electromagnetic coil is formed, and a recess opening toward the annular groove and an insertion hole communicating the recess with the outside are formed in the through hole. While press-fitting the connector holding member provided with, the surge voltage absorbing element is housed in the recessed portion, the lead portion of the surge voltage absorbing element and the end portion of the electromagnetic coil are inserted into the insertion hole, and the tip thereof is An exciting device for an electromagnetic coupling device, which is fixed to the connector holding member.