JPH0648020B2 - Electromagnetic coupling device - Google Patents

Abstract

PURPOSE:To effectively use a space in a terminal bed made of resin materials by insert-forming a pair of terminals in the terminal bed, by connecting them to both ends of an exciting coil while disposing a diode in a space between the terminals, by connecting lead wires from the diode to both terminals. CONSTITUTION:A terminal bed 16 made of resin materials is fixed to the rear surface of a yoke 3 incorporating an exciting coil 4 through the intermediary of an attaching plate 2. A pair of terminals 30, 31 are insert-formed simultaneously with the molding of the terminal bed 16. The terminals 30, 31 are connected thereto with the wind leading end 4a and wind trailing end 4b of the exciting coil 4, respectively. A surge killer diode 33 stored in a casing 3 is disposed in a space S between the terminals 30, 31, lead wires from the diode 33 is held in slits 36 formed in the terminals 30, 31 and are connected to the terminals 30, 31. With this arrangement, the diode is stored in the terminal bed while it is electrically connected to an external circuit by being connected to the terminals in the terminal bed, and therefore no design change is required, irrespective of the lengths of the lead wires or the presence of a diode, thereby it is possible to enhance the general purpose use thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an electromagnetic coupling device for connecting / disconnecting transmission of rotational torque or braking of a rotating body by excitation or non-excitation of an exciting coil, particularly a yoke having an exciting coil installed therein. The present invention relates to an electromagnetic coupling device including an electromagnet including a resin-made terminal block fixed to the back surface of the yoke.

[Conventional technology]

For example, an electromagnetic clutch mounted on a refrigerant compressor as an air conditioner for an automobile has lead wires with different lengths depending on the wiring state with other auxiliary machines in the automobile. It is bad and uneconomical. Also, in this main electromagnetic clutch, a surge killer diode is installed in the lead wire drawn out from the electromagnet, but it depends on whether it is installed inside the electromagnet or outside the electromagnet, and the versatility of the electromagnet is also poor. It is uneconomical.

Therefore, as an electromagnetic coupling device for solving such a problem, for example, a device disclosed in Japanese Utility Model Publication No. 63-6512 has been proposed. This device has a yoke in which an exciting coil is fixedly provided in an annular groove with epoxy resin or the like,
It is equipped with an electromagnet consisting of a terminal block fixed to the rear surface of the yoke by a cut-and-raised piece of a mounting plate that is welded to the rear surface of the yoke, and the terminal insert-molded in the terminal block is connected to the exciting coil. And a connecting portion connected to an external electric circuit. When assembling the electromagnet of the electromagnetic coupling device configured as described above, the cut-and-raised piece formed on the outer side of the mounting plate is bent to temporarily fix the terminal block to the yoke, and then the winding start end of the exciting coil. And the end portion of the winding are hooked on a locking piece formed by cutting and raising the wire connection portion of the terminal, and the exciting coil and the locking piece are integrally fixed by soldering or fusing. Next, a metal lid is placed on the terminal block, and the cut-and-raised piece formed on the inner side of the mounting plate is expanded by caulking to fix the terminal block and the lid to the yoke.

In addition to this, for example, an electromagnetic coupling device disclosed in Japanese Patent Laid-Open No. 57-51026 has been proposed. In this device, a lead wire pulled out from an electromagnet is connected to a terminal in which a surge killer diode is resin-molded. Connect
An external electric circuit is connected to the electromagnet via this terminal. The ground side of the lead wire is fixed to this housing by integrally screwing the ground terminal at the tip and the resin-molded ground piece to the housing of the refrigerant compressor.

[Problems to be Solved by the Invention]

By the way, in such a conventional electromagnetic coupling device,
As a countermeasure against the vibration of the automobile engine and the vibration during running, a pair of terminals are insert-molded on the terminal block made of resin material, and only the connecting part connected to the external electric circuit is projected to the concave space side. Together with the connection between the excitation coil and the terminal, an inner wall formed between a pair of connection portions connected to the excitation coil, and a locking piece integrally formed by bending at the connection portion of the terminal, The winding start end and the winding end end of the exciting coil are drawn into the terminal block from between the inner wall and the side surface of the locking piece, and these ends and terminals can be mechanically and electrically satisfied. It is considered that the wires are firmly connected with the contact area obtained.

However, in such a structure, there is an inner wall between the connection portions or there is an integrally bent portion that is cut and raised upward in the terminal, so that there is a problem that the space in the terminal block cannot be effectively used.

Also, in such an electromagnetic coupling device, it is necessary to take waterproof measures inside the terminal block, but like the conventional device, a metal lid is attached to the resin terminal block by caulking the cut-and-raised part of the mounting plate. The structure of fixing is not good in terms of quality and lacks reliability.

In addition, when mounting the diode, the diode is resin-molded on the terminal and insert-molded integrally to take measures against vibrations and waterproofing. There was a problem that time was long, workability was poor, and it was uneconomical.

The present invention has been made in view of the above points, and it is an object of the present invention to provide an electromagnetic coupling device including an electromagnet having a terminal block capable of housing a diode by effectively utilizing an internal space. A second object is to provide an electromagnetic coupling device including an electromagnet having a terminal block in which the opening of the terminal block accommodating the diode is closed by an upper lid and the inside and outside of the terminal block are completely sealed. I am trying.

[Means for Solving the Problems]

In order to achieve such an object, the present invention insert-molds a pair of terminals, which are punched from a plate material by press molding and are parallel to each other in a space, in a resin-made terminal block fixed to the back surface of the yoke. Connect one end to the winding start end and the winding end end of the yoke side excitation coil, respectively, and project the other ends of these terminals from the terminal block to the outside.
A diode is arranged in the space between the two terminals, and a lead wire of the diode is laid over the terminals to connect them.

In addition, a housing having an opening on one surface is provided on the terminal block, and a lid made of a resin material that closes the opening is press-fitted into a press-fitting wall formed on the opening edge of the housing, and the lid and the opening edge surface. And a pair of terminals insert-molded in the housing, and a winding start end and a winding end end of the exciting coil drawn into the housing via a rubber bush. Was connected, a diode was arranged between the pair of terminals, and the lead wire of the diode was connected to the terminal.

[Work]

In this electromagnetic coupling device, the diode is housed in the terminal block, and the electromagnet and the external electric circuit are electrically connected by connecting the electric circuit and the terminal in the terminal block, so that they are connected to the exciting coil. It is not necessary to change the design of the electromagnet depending on the length of the lead wire and the presence or absence of the diode.

Further, since the resin-made terminal block is press-fitted into the resin-made terminal block and the elastic packing is inserted between the terminal block and the lid, the resin casting work is required. do not do.

〔Example〕

1 to 4 show an example in which the electromagnetic coupling device according to the present invention is applied to an electromagnetic clutch for a compressor, FIG. 1 is a longitudinal sectional view of the electromagnetic clutch, FIG. 2 is a side view of the same, and FIG. (a)
Is a perspective view of a terminal block having a lid body viewed from the direction of arrow A in FIG. 3 (b), and FIG. 3 (b) is a terminal block excluding the lid body viewed from the direction of arrow B of FIG. 3 (a) Front view of Fig. 3 (c) is C of Fig. 3 (b)
C sectional view, FIG. 4 (a) is a front view of the terminal, and FIG. 4 (b) is a side view of the same. In the figure, an electromagnetic clutch 1 includes a yoke 3 fixed to a housing of a compressor (not shown) via a mounting plate 2, and an annular groove 3 a of the yoke 3.
An exciting coil 4 is internally provided in the. In the cylindrical portion 5 of the housing, a rotor 6 having an annular groove 6a is rotatably supported by a bearing 7 and its axial movement is restricted, and the yoke 3 is free to move in the annular groove 6a. It is fitted. On the other hand, a hub 9 formed in a cylindrical shape with a flange is attached to the tip of the drive shaft 8 of the compressor penetrating the cylindrical portion 5 and fixed to the drive shaft 8 with a bolt 10. An armature 12, which is formed in the shape of an annular plate as a whole, is rivet-attached to the leaf spring 11 rivet-attached to the flange 9a with the friction surface 12a facing the friction surface 6b of the rotor 6. The armature 12 is formed by an outer ring-shaped member 12a and an inner ring-shaped member 12b that are concentrically arranged with a gap 13 between them, and between the inner ring-shaped member 12b and the collar 9a of the hub 9. The stopper rubber 14 is inserted and clamped between. That is, the armature 12 is elastically held by the hub 9 by the leaf spring 11, and the rotor 6 and the armature 1 are
A gap indicated by a symbol C in the figure is formed between the two and the gap. Reference numeral 15 is a pulley fitted and welded to the outer circumference of the rotor 6, which is belt-connected to a pulley provided on the crankshaft of an automobile engine, and is configured to always rotate together with the rotor by the rotation of the engine. ing.
Reference numeral 16 is a terminal block (to be described later) which constitutes an electromagnet 17 together with the yoke 3, and the exciting coil 4 is connected to an external electric circuit via this terminal block 16 and is controlled by ON-OFF control of this electric circuit. When the exciting coil 4 is energized,
The armature 12 is magnetically attracted to the rotor 6 by the generated magnetic flux, and the rotation of the rotor 6 is transmitted to the drive shaft 8.

The terminal block 16 made entirely of a resin material is used for the exciting coil 4
Is fixed to the back surface of a yoke 3 provided inside via a mounting plate 2, and constitutes an electromagnet 17 together with the yoke 3.
This terminal block 16 is a thin rectangular parallelepiped casing 18 having an opening 18a on one surface facing forward, concave flanges 19 and 20 projecting from both side faces of the casing 18, and downward from the casing 18. It is integrally formed with a bottomed rectangular tubular housing 21 that protrudes to the bottom. Further, the opening 18 formed in the housing 18
A press-fitting wall 22 formed of a resin material in a thin-walled rectangular tube shape is integrally projecting from the opening edge of a. The press-fitting wall 22 has a thin-walled tongue at the center of each of the four sides to have elasticity. A locking piece 23 made of a resin material and formed in a piece shape is provided so as to project integrally. The terminal block 16 configured in this way
Is a pair of protrusions 24, 2 formed on the outer bottom surface of the housing 18.
5 is a recess 2b formed in the flange 2a of the mounting plate 2.
Then, the cut-and-raised pieces 26, 27 on the side of the mounting plate 2 are pressed by recesses 19a, 20a formed in the flanges 19, 20 so as to be lowered toward the housing 18. It is fixed to the back surface of the yoke 3 via the mounting plate 2 by bending and pressing.

The winding start and winding end portions 4a, 4 of the exciting coil 4 drawn from the rubber bush 2c on the flange 2a side of the mounting plate 2
b is inserted into the rubber bushes 28 and 29 fitted in the semi-circular groove formed at the upper end of the opening 18a of the housing 18 and drawn into the housing 18, and the insertion end thereof has a pair of terminals 3.
It is connected to one end of each of 0 and 31.

The pair of terminals 30 and 31 are formed by punching and bending a plate material by press working, and are insert-molded at the same time when the terminal block 16 is molded. These terminals 30 and 31 are parallel to each other in the housing 18 from the connection ends with the exciting coil 4 and extend downward with a space portion indicated by a symbol S in the drawing separated therebetween, and the other ends are connected to the housing 18 at the other ends. To the inside of the housing 21 and is connected to an external electric circuit (not shown) through a plug in a female housing (not shown) that fits outside the housing 21. Also, each terminal 3
0, 31 exciting coil winding start, winding end 4a, 4b
The connecting portion with and is bent into a substantially rectangular shape, and a slit 32 into which the winding start and winding end portions 4a and 4b are press-fitted is formed at the opposing portion thereof, and by this press-fitting fixation, the winding start , Winding end portions 4a, 4b and terminals 30,
A contact area that is mechanically and electrically satisfactory can be obtained between the contact point 31 and the contact point 31, and can be firmly fixed, and a sufficient electric capacity can be obtained.

In the space S formed between the terminal 30 and the terminal 31, a surge killer diode 33 is housed and disposed in a case 34, and the lead wire 3 of the diode 33 is provided.
The wire 5 is connected to the slits 36 formed in the terminals 30 and 31.

The housing 18 of the terminal block 16 configured in this manner has the opening 18a closed by the lid 37. That is, the lid 37 formed on the thin casing is inserted while elastically deforming the locking piece 23 with the flange 37a at the opening end and fitted with the press-fitting wall 22. A waterproof packing 38 made of an elastic material such as rubber is interposed and sandwiched between the housing 18 and the peripheral edge surface of the opening. Further, a semicircular groove is formed at the upper end of the lid body 16, and the rubber bush 2 is formed with the semicircular groove on the side of the housing 18.
8 and 29 are sandwiched.

The operation of the electromagnetic coupling device configured as described above will be described. Since the exciting coil 4 is connected to an external electric circuit via the terminals 30 and 31 in the terminal block 16, when the exciting coil 4 is energized by ON-OFF control of this electric circuit, the magnetic flux generated causes the armature 12 to move. Leaf spring 11
The rotor 6 is magnetically attracted to the rotor 6 against the spring force, and the rotation of the rotor 6 that is driven by the automobile engine and rotates together with the pulley 15 is transmitted to the drive shaft 8 to drive the compressor.

When the excitation of the exciting coil 4 is released from this state, the attraction of the armature 12 is released, so the armature 12 is separated from the rotor 6 by the spring force of the leaf spring 11, and a gap G is formed between the friction surfaces 6b and 12a. Formed, pulley 15
The rotation transmission from the drive shaft 8 to the drive shaft 8 is cut off, and the drive shaft 8 stops.

Next, the assembling work of the terminal block 16 will be described. First, the housing 18
After fitting the pair of protrusions 24 and 25 formed in the above into the recess 2b of the mounting plate 2 and aligning them, the flange 19 and
The cut-and-raised pieces 26, 27 on the side of the mounting plate 2 are bent and pressed by press working into the recesses 19a, 20a formed in the terminal 20, and the terminal block 16 in which the terminals 30, 31 are insert-molded is attached to the mounting plate 2. It is fixed to the flange 2a. Then, in the housing 18 of the terminal block 16, the winding start and winding end portions 4a and 4b of the exciting coil 4 which is inserted from the yoke 3 and pulled out by the rubber bush 2c are connected to the terminals 30 and 3, respectively.
The first slit 32 is press-fitted and fixed. Further, a case 34 accommodating the diode 33 is arranged in the space S,
The lead wire 35 of the diode 33 is press-fitted and fixed to the slits 36 of the terminals 30 and 31. Next, the lid 37 is inserted into the casing 18 while the packing 38 is inserted between the lid 37 and the end face of the opening.
When the lid body 37 is pushed by fitting into the press-fitting wall 22 of the opening, the lid body 37 is press-fitted while elastically deforming the locking piece 23, and the flange 37a of the lid body 37 and the locking piece 23 are engaged. The lid 37 is firmly fixed in a state where it is prevented from coming off.

In this embodiment, the connection between the terminals 30 and 31 and the ends of the exciting coil 4 is bent in a substantially quadrangular shape, but it may be bent in a V shape or an S shape. Further, a guide wall for housing the case 34 of the diode 33 may be provided in the housing 18, and the guide wall may prevent the vibration of the diode 33. Further, in this embodiment, the mounting plate 2 is provided with the flange 2a, and the terminal block 1 is attached to the flange 2a.
Although the example in which 6 is fixed is shown, the terminal block 16 is brought into contact with and fixed to the back surface of the yoke 3 so that the winding start and end portions 4a and 4b of the exciting coil 4 are not exposed to the outside.
It may be configured to be drawn into the terminal block 16 from. Further, although the example in which the electromagnetic coupling device according to the present invention is applied to the electromagnetic clutch is shown in the present embodiment, the present invention can also be applied to an electromagnetic brake in which an armature is magnetically attracted to an electromagnet.

〔The invention's effect〕

As is apparent from the above description, in the electromagnetic coupling device according to the present invention, a pair of parallel members are formed by punching from a plate material in a resin terminal block fixed to the rear surface of the yoke by a space. Insert-mold the terminals and connect one end to the winding start end and the winding end end of the yoke side excitation coil, respectively, and project the other ends of these terminals from the terminal block to the outside. By arranging the diode in the space and connecting the lead wire of the diode to the both terminals and connecting them, the diode is housed in the terminal block, and the electromagnet and the external electric circuit are connected to this electric circuit. Since the electrical connection is made by connecting the terminals in the terminal block, it is not necessary to change the design of the electromagnet depending on the length of the lead wire connected to the exciting coil and the presence / absence of a diode. With versatility is improved, it can be terminal blocks constitute the entire electromagnetic coupling device is compact in compact small.

In addition, a housing having an opening on one surface is provided on the terminal block, and a lid made of a resin material that closes the opening is press-fitted into a press-fitting wall formed at the opening edge of the housing, and the lid and the opening edge surface. And a pair of terminals insert-molded in the housing, and a winding start end and a winding end end of the exciting coil drawn into the housing via a rubber bush. By connecting the lead wire of the diode and the terminal by disposing a diode between the pair of the terminals, a lid made of a resin material is press-fitted to a terminal block made of a resin material, Since the packing made of elastic material is inserted between the terminal block and the lid, the resin casting work is not required, and the assembly work is simplified to improve the productivity and reduce the price. You can

[Brief description of drawings]

1 to 4 show an example in which the electromagnetic coupling device according to the present invention is applied to an electromagnetic clutch for a compressor, FIG. 1 is a longitudinal sectional view of the electromagnetic clutch, FIG. 2 is a side view of the same, and FIG. (a)
Is a perspective view of a terminal block having a lid body viewed from the direction of arrow A in FIG. 3 (b), and FIG. 3 (b) is a terminal block excluding the lid body viewed from the direction of arrow B of FIG. 3 (a) Front view of Fig. 3 (c) is C of Fig. 3 (b)
C sectional view, FIG. 4 (a) is a front view of the terminal, and FIG. 4 (b) is a side view of the same. 1 ... Electromagnetic clutch, 2 ... Mounting plate, 3 ... Yoke,
4 ... Excitation coil, 4a ... Winding end, 4b ... Winding end, 6 ... Rotor, 16 ... Terminal block, 17 ... Electromagnet, 18 ... Casing, 21 ... Housing, 22 ...... Press-fitting wall, 23 ...... Locking pieces, 28, 29 ...... Rubber bush,
30, 31 ... Terminal, 33 ... Surge killer diode, 34 ... Case, 35 ... Lead wire, 37 ... Lid, 38 ... Packing, S ... Space section.

Claims (2)

[Claims] 1. An electromagnetic coupling device comprising an electromagnet comprising a yoke having an exciting coil provided therein and a resin-made terminal block fixed to a rear surface of the yoke, wherein the terminal block is provided with:
A pair of terminals, which are punched from a plate material by press molding and are parallel to each other with a space therebetween, are insert-molded, and one ends thereof are respectively connected to a winding start end portion and a winding end end portion of the yoke side excitation coil, and these terminals are connected. The other end is projected from the terminal block to the outside, a diode is arranged in the space between the terminals, and a lead wire of the diode is hung over the terminals to be connected. Coupling device. 2. An electromagnetic coupling device including an electromagnet comprising a yoke having an exciting coil therein and a terminal block made of a resin material fixed to the rear surface of the yoke, wherein a casing having an opening on one surface is provided. A resin-made lid body that closes the opening is press-fitted into a press-fitting wall that is provided on the terminal block and that is formed at the opening edge of the housing, and an elastic material packing is provided between the lid body and the end surface of the opening edge. While sandwiching, a pair of terminals insert-molded in the housing and a winding start end and a winding end of the exciting coil drawn into the housing through a rubber bush are connected to each other to connect the pair of terminals. An electromagnetic coupling device characterized in that a diode is disposed in the diode and the lead wire of the diode is connected to the terminal.