JPS6141451Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of an excitation device for an electromagnetic coupling device that generates a coupling torque by controlling the excitation of an excitation coil built into a stator.

A conventional electromagnetic coupling device is constructed as shown in FIGS. 1 to 4.

First, in FIG. 1, reference numeral 1 denotes a machine frame for a compressor for a car cooler, etc., and a plate 2 is attached to the side surface of the frame by bolts 3. Reference numeral 4 denotes an annular stator having a U-shaped cross section fixed to the side surface of the plate 2, and an excitation coil 6 is housed and fixed by resin 5 in an annular groove 41 which is a storage chamber of the stator 4. ing. Reference numeral 7 designates an annular rotor having a U-shaped cross section so as to surround the outer periphery of the stator 4, and 7a designates elongated holes for magnetic shielding, which are formed inside and outside. Further, a V-groove for a V-belt (not shown) is formed on the outer periphery of the rotor 7. Reference numeral 8 denotes a bearing that is fitted and fixed to the cylindrical portion 1a protruding from the machine frame 1 of the compressor and the rotor 7, and rotatably supports the rotor 7. Reference numeral 9 indicates the machine frame 1 of the compressor.
A hub 11 having a plate 11a is fixed to the rotating shaft 9 via a key 10, and a nut 12 is attached to the tip of the rotating shaft 9 to prevent the hub 11 from moving in the axial direction. They are screwed together. Reference numeral 13 denotes an armature disposed with a predetermined axial gap g between the rotor 7 and an elongated hole 13a for magnetic shielding. It is fixed integrally. Rivets 15 and 16 fix the leaf spring 14 to the armature 13 and the plate 11a, respectively. Reference numeral 17 denotes a bush made of an elastic body such as rubber attached to the plate 11a, and the anti-rotor 7 of the armature 13
Movement to the side is restricted. Note that a plurality of leaf springs 14 and bushes 17 are both provided in the circumferential direction of the plate 11a.

Next, in FIG. 2, the lead wire 18, which is the (+) side lead-out end of the exciting coil 6,
The (-) of the excitation coil 6 is drawn out from inside the groove 41 to the outside through the
The ground wire 19, which is the side lead-out end, also penetrates the bottom 4a of the stator 4 and is led out from inside the groove 41. The lead wire 18 is inserted into a bush 21 installed in a lead wire draw-out hole 20 formed in the bottom 4a of the stator 4 and pulled out. Also, the ground wire 19 is also connected to the ground wire draw-out hole 2 which is formed in the bottom portion 4a at a distance from the lead wire draw-out hole 20.
It is inserted into a bush 23 attached to the holder 2 and pulled out. A terminal 25, which is fixed by a rivet 24 driven into a punched hole (not shown) formed in the bottom 4a of the stator 4, is attached to the tip of the ground wire 19, and is grounded to the body. 26 is a terminal electrically connected to the lead wire 18. In FIG. 3, 27 is a tape wound around the excitation coil 6 to insulate it. Generally, excitation coil 6
and the lead wire 18 are fixed by soldering at the connection part 28,
Moreover, the ground wire 19 and the terminal 25 are also fixed by soldering.

Next, the operation will be explained. First, when the excitation coil 6 is energized and energized through the lead wire 18 and the ground wire 19, a magnetic flux Φ is generated in the magnetic path shown by the dotted line, and the armature 13 resists the elastic force of the leaf spring 14 and moves toward the rotor 7.
The rotational force transmitted to the rotor 7 by a V-belt (not shown) to connect with the rotor 7 is transferred to the rotor 7, the armature 13, and the leaf spring 1.
4. It is transmitted to the rotating shaft 9 via the hub 11 and drives a compressor, etc. When the excitation coil 6 is deenergized, the armature 13 moves toward the side opposite to the rotor 7 due to the elastic force of the leaf spring 14, returns to its original state, and comes into contact with the bush 17.

Here, the work of attaching the excitation coil 6 to the stator 4 will be explained. That is, the excitation coil 6 is
4, after winding the excitation coil 6, one of the lead-out ends of the excitation coil 6 and the lead wire 1
8 by soldering, and then connect lead wire 1.
8 and the ground wire 19 are exposed, the excitation coil 6 is wrapped with a tape 27 for insulation protection. On the other hand, bushes 21 and 23 are inserted into the holes 20 and 22 of the bottom 4a of the stator 4, respectively, and the lead wires 18 and the ground wires 19 of the excitation coil 6 are inserted into the holes 20 and 22, respectively.
The excitation coil 6 was housed in the groove 41 of the stator 4 while being inserted into each bush 21, 23, and fixed with the resin 5. After that, the terminals 25 and 26 are fixed to the lead wire 18 and the ground wire 19, respectively, by caulking, soldering, or the like.

In the above work, the excitation coil 6, tape 27
The winding work is performed by a machine, but there is also a soldering work to connect the lead wire 18 and one of the lead-out ends of the excitation coil 6, and a caulking work to connect each lead wire 18, ground wire 19 and each terminal 25, 26. Soldering work is generally done manually. Therefore, although the injection of the resin 5 into the concave groove 41 is automated, each of the above-mentioned operations is done manually, which takes a considerable amount of time, which becomes a bottleneck in production, and each soldering operation requires the use of resin. This problem complicated the work process before and after the injection of No. 5. Furthermore, if a gap is created between the bushes 21, 23 and the draw-out holes 20, 22 of the bottom 4a of the stator 4, or between the bushes 21, 23 and the lead wire 18, ground wire 19, the resin 5 will flow out from the gap. There is a fear.

This invention provides an excitation device for an electromagnetic coupling device that solves the above problems.

The embodiment shown in FIGS. 5 to 8 will be described below.

In the figure, reference numeral 4 denotes a groove 41 which is a storage chamber for storing the excitation coil 6 which has been wrapped in advance and wrapped with an insulating tape 27, and a hole bored in the bottom 4a to communicate the groove 41 with the outside. In the stator, the communication hole 42 is formed in a tapered shape that becomes narrower as it extends outward from the groove 41.
29 is a grommet that is fitted into the communication hole 42, and an annular flange 29a that makes surface contact with the wall surface of the groove 41 of the stator 4 is integrally molded.
Similarly to the communication hole 42, the communication hole 42 is also formed in a tapered shape. The lead wire 18 and the ground wire 19 are inserted into the grommet 29 and hold the terminals 25 and 26 in an unfixed state. By connecting the terminals 25 and 26 to the lead wire 18 and the ground wire 19 by caulking or soldering, the excitation coil 6 is manufactured as a single unit as shown in FIGS. 5 and 6.
Next, each terminal 2 of the lead wire 18 and the ground wire 19
5 and 26 are inserted into the communication hole 42 of the stator 4 and brought out to the outside, the grommet 29 is fitted into the communication hole 42, and the excitation coil 6 is housed and held in the groove 41 of the stator 4. Annular flange 2 of grommet 29
9a is in surface contact with the wall surface inside the groove 41, and together with the grommet 29, completely closes the communication hole 42, and the resin 5
When the resin 5 is injected into the groove 41, the resin 5 fills the communication hole 4.
2 and the grommet 29 or the lead wire 18
It also prevents leakage to the outside through the gap between the ground wire 19 and the grommet 29. In addition, soldering work and caulking work for connecting one of the lead-out ends of the excitation coil 6 and the lead wire 18, or connecting the lead wire 18 and the ground wire 19 to each terminal 25, 26, which are generally done manually, are also required. is excitation coil 6
can be assembled as a single unit, reducing the number of work steps and making the work faster. Furthermore, after the excitation coil 6 is fixed in the groove 41 of the stator 4 with the resin 5, the only work required is to caulk and fix the terminal 25 of the ground wire 19 to the bottom 4a of the stator 4 with the rivet 24, which makes automatic manufacturing possible. It becomes possible. Also, the two lead wires 18 and the ground wire 19 can be connected to a single grommet 2.
Since the grommet 29 and the communication hole 42 are tapered, the working time required to fit the grommet 29 including the lead wire 18 and the ground wire 19 into the communication hole 42 of the stator 4 is significantly reduced. This means that the time can be shortened, and if the above factors are taken together, the cost of the device can be significantly reduced.

Incidentally, the lead wire 18 and the ground wire 19 may be insulated and held by two grommets.

As described above, according to this invention, a pair of lead wires of an excitation coil are inserted and held in a grommet in advance, and this grommet is fitted into a communication hole of a stator.
By leading the pair of lead wires to the outside from the stator storage chamber through the grommet, insulation protection of the pair of lead wires can be ensured, and it is also possible to connect terminals to the pair of lead wires in advance.
In addition, since the grommet is tapered and fitted into the communication hole, the work time required to fit the grommet including the pair of lead wires into the communication hole of the stator can be shortened, making it easier to manufacture the exciter. By providing a flange at the end of the grommet that can be joined to the wall of the stator storage chamber and close the communication hole, the resin impregnated in the storage chamber can be prevented from flowing out from the communication hole. It has many practical effects.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the main parts of the electromagnetic coupling device, Figure 2 is a side view of the electromagnetic coupling device showing a conventional example, Figure 3, Figure 4
The figure shows a front view and a sectional view of the main part of the exciting coil 6, and FIG. 5 and FIG. 6 show an example of the exciting coil 6.
7 is a front view and a cross-sectional view of the main part, FIG. 7 is a cross-sectional view of the main part showing the excitation coil 6 housed in the stator 4,
The figure is a sectional view of the main part of the stator 4. In the figure, 4 is a stator, 4a is a bottom, 41 is a groove, 42 is a communication hole, 5 is a resin, 6 is an excitation coil, 7 is a rotor, 13 is an armature, 18 is a lead wire, and 19 is a ground wire. , 25, 26 are terminals, 29
is a grommet. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] a stator having a storage chamber for storing an excitation coil; a stator having a communication hole communicating the storage chamber with the outside; a pair of lead wires for feeding power to the excitation coil; the pair of lead wires being inserted and held; a grommet that is fitted into the communication hole of the stator from the side of the storage chamber and has a tapered shape and has a flange at an end thereof that can be joined to a wall surface of the storage chamber of the stator to close the communication hole; An electromagnetic coupling device comprising: a resin impregnated with a resin for insulating and fixing the excitation coil, the pair of lead wires being led out from the storage chamber of the stator through the grommet.