JPH07301259A - Electromagnetic clutch - Google Patents

Abstract

PURPOSE:To prevent this clutch from getting submerged as having as surge absorber built in, without reducing a coil space from the standpoint of setting up this surge absorber. CONSTITUTION:A terminal part 10 of a stator is provided with a recess 13a to store a surge absorber 2 in a lead holding part 13 holding a lead wire 6. The surge absorber 2 stored in this recess 13a is connected to a terminal plate 14, where this lead wire 6 is connected, by means of soldering or the like (caluking, fusing, pressing-in, binding and suchlike, by way of example). The terminal plate 14 is inserted into an insertional groove 15a installed in a base part 15 forming a basis of the terminal part 10, and connected to a terminal line 7a of an exciting coil supported by the base part 15. In addition, a lead part 2a of the surge absorber 2 to be connected to the terminal plate 14 is supported by a receiver seat 13b installed in the lead holding part 13, whereby any possible deformation due to resin pressure in time of mold resin being poured into, is preventable from occurring.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic clutch having a surge absorbing device for absorbing surge voltage.

[0002]

2. Description of the Related Art Conventionally, an electromagnetic clutch is provided with a surge absorbing device for absorbing a surge voltage generated when energization of an exciting coil is stopped. As a method of mounting this surge absorber, for example, a method of housing it in the coil housing portion of the stator housing (K.
No. 8998), a refrigerant compressor including a fixed portion of an electromagnetic clutch, or a method of locking the refrigerant compressor to a predetermined portion of its support (Japanese Patent Laid-Open No. 57-51026), of an exciting coil taken out of a stator. A method of disposing on a lead wire (Japanese Utility Model Laid-Open No. 12732/1985) has been proposed.

[0003]

In the above method, however, the coil space in the stator housing is reduced by accommodating the surge absorbing device, resulting in deterioration of the performance of the electromagnetic clutch. In addition, a step of connecting the coil wire or the lead wire is required, which increases the number of assembling steps.

In the above methods and (3), since the surge absorbing device is arranged outside the electromagnetic clutch main body, it is easily exposed to water, and the surge absorbing device requires strength to be fixed, resulting in an increase in cost. The problem arises. The present invention has been made based on the above circumstances, and an object thereof is to solve each of the above problems in an electromagnetic clutch provided with a surge absorbing device.

[0005]

In order to achieve the above object, the present invention comprises the following technical means for each claim. According to a first aspect of the present invention, there is provided a stator having an exciting coil that generates a magnetic force by receiving an electric current through a lead wire and provided with a terminal portion that electrically connects a terminal wire of the exciting coil and the lead wire. A surge absorber for absorbing a surge voltage generated when the energization of the exciting coil is stopped is built in the terminal portion.

According to a second aspect, in the electromagnetic clutch according to the first aspect, the terminal portion is provided integrally with a spool around which the exciting coil is wound, and a base portion that supports a terminal wire of the exciting coil. After the tip of the lead wire is electrically connected and assembled to the base portion,
A terminal plate electrically connected to a terminal wire of the exciting coil; and a lead wire holding portion that holds a tip portion of the lead wire and is fixed to a stator housing that houses the exciting coil. The surge absorbing device has a pair of lead portions, which are electrically connected to the terminal plate and fixed by a mold resin injected into the terminal portion.

According to a third aspect of the present invention, in the electromagnetic clutch according to the second aspect, the lead wire holding portion is provided with a support portion that supports the lead portion of the surge absorbing device.

[0008]

In the invention described in claim 1, the surge absorbing device is built in the terminal portion provided in the stator. Therefore, the coil space for accommodating the exciting coil is not reduced, and there is no fear that the surge absorber will be exposed to water.

According to the second aspect of the invention, the lead portion of the surge absorbing device is connected to the terminal plate to which the tip of the lead wire is electrically connected. As a result, the step of connecting the coil wire and the lead wire is not necessary, and the number of assembling steps can be reduced. Further, since the surge absorbing device can be firmly held by the mold resin injected into the terminal portion, strength is not required to fix the lead portion of the surge absorbing device.

According to the third aspect of the present invention, the lead portion of the surge absorbing device is supported by the support portion provided in the lead wire holding portion that holds the tip portion of the lead wire. As a result, it is possible to prevent the lead portion from being deformed by the resin pressure of the mold resin injected into the terminal portion.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the electromagnetic clutch of the present invention will be described with reference to FIGS. FIG. 1 is a sectional view of an electromagnetic clutch. The electromagnetic clutch 1 of this embodiment is mounted on a refrigerant compressor (not shown) of a vehicle refrigeration cycle, and includes a surge absorber 2 (see FIGS. 2 to 4) of a stator 3 and an engine (not shown). The rotor 4 is configured to rotate when rotational power is transmitted, the rotor 4 is arranged to face the rotor 4 in the axial direction, and a hub assembly (described later) that supports the armature 5 is provided.

The stator 3 has an exciting coil 7 that generates a magnetic force by being energized via a lead wire 6 (see FIG. 5), a spool 8 that holds the exciting coil 7, and an exciting coil that is held by the spool 8. A stator housing 9 for housing 7 is provided, and a terminal portion 10 for electrically connecting the lead wire 6 and the exciting coil 7 is provided in a part of the stator housing 9.

As shown in FIG. 5, the lead wire 6 is composed of a plus side lead wire 6a and a minus side lead wire 6b, and a connector 11 for connecting to an external power source is provided at an end of the plus side lead wire 6a. The grounding terminal 12 is attached to the end of the negative side lead wire 6b. As shown in FIG. 2, the lead wire 6 has the tip end portion held by the lead wire holding portion 13 and the terminal plate 1
Electrical connection with the exciting coil 7 is established via the switch 4.

The lead wire holding portion 13 is made of resin and is fixed to the stator housing 9 by integrally holding the plus side lead wire 6a and the minus side lead wire 6b. The lead wire holding portion 13 is provided with a recess 13a (see FIG. 2) for accommodating the surge absorber 2 in the center thereof.
Further, receiving seats 13b (see FIGS. 2 and 3) for receiving the lead portions 2a of the surge absorber 2 are formed on both side walls of the recess 13a, and the back side of the recess 13a (left side in FIG. 2).
Is a fitting portion 13 for fixing to the stator housing 9.
c (see FIG. 2) is provided.

The terminal plates 14 are made of metal and are provided on the plus side and the minus side, respectively. As shown in FIGS. 2 and 3, the terminal plate 14 has a plate-shaped insertion portion 14a for coupling to the spool 8,
A lead wire crimping portion 14b for crimping and fixing the distal end portion of the lead wire 6, a coil wire fixing portion 14c for fixing the terminal wire 7a of the exciting coil 7, and a flange portion 14d protruding to the outside of the insertion portion 14a are provided. .

The exciting coil 7 is formed by winding a coil wire having an insulating coating on a spool 8. As shown in FIGS. 2 and 4, the coil wire has a winding start end and a winding end end (the end described above). The wire 7a) is fixed to the coil wire fixing portion 14c of the terminal plate 14 by fusing or the like.

The spool 8 is made of resin and has an annular shape, and the base portion 1 which forms the basis of the terminal portion 10 on a part of the peripheral side surface.
5 are integrally provided (see FIGS. 2 and 3). In this base portion 15, a terminal wire takeout portion (not shown) for taking out the terminal wire 7a of the exciting coil to the terminal portion 10 side.
And a pair of insertion grooves 15a into which the insertion portion 14a of the terminal plate 14 is inserted.

The stator housing 9 is made of a magnetic material such as iron, and the rotor 4 is also made of a magnetic material.
And the armature 5 to form a magnetic path of the exciting coil 7, and a housing of the refrigerant compressor via an annular arm support 16 (see FIG. 5) fixed to the end surface on the refrigerant compressor side (the right end surface in FIG. 1). It is fixed to (not shown).

The stator housing 9 is provided with an annular storage recess 9a (see FIG. 3) for storing the exciting coil 7 wound on the spool 8, and the spool 8 is provided at a part of the bottom surface of the storage recess 9a. An outlet 9b (see FIG. 2 and FIG. 3) for taking out the base portion 15 provided at the opening is opened.

A protrusion 16a (see FIG. 2) for locking the fitting portion 13c of the lead wire holding portion 13 is projected on the arm support 16 toward the outlet 9b side. Therefore, as shown in FIG. 2, the lead wire holding portion 13 is fixed to the stator housing 9 (actually, the arm support 16) by engaging the fitting portion 13c with the protrusion 16a.

The surge absorbing device 2 uses a diode and has a recess 13a provided in the lead wire holding portion 13.
The lead portion 2a of the surge absorber 2 is joined to the flange portion 14d of the terminal plate 14 by soldering or the like (caulking, fusing, press fitting, tangling). At this time, as shown in FIGS. 2 and 3, the lead portions 2a of the surge absorber 2 are respectively connected to the lead wire holding portions 1a.
3 is supported by a receiving seat 13b.

In the stator 3, the exciting coil 7 wound around the spool 8 is accommodated in the stator housing 9 in the recess 9a.
Then, the exciting coil 7 is resin-molded by injecting the molding resin 17 from the opening side of the accommodation recess 9a (left side of the stator housing 9 shown in FIG. 1). At this time,
The molding resin 17 flows into the terminal portion 10 side through the gap between the outlet 9b of the stator housing 9 and the base portion 15 to mold the terminal portion 10. The terminal portion 10 includes a lead wire holding portion 13, a terminal plate 14, and a base portion 15.

The rotor 4 has an annular shape having a U-shaped section (inverted U-shaped in FIG. 1) for accommodating the stator 3, and a housing of the refrigerant compressor via a bearing 18 arranged on the inner periphery thereof. It is rotatably supported by. This rotor 4
A pulley 19 is fixed to the outer peripheral portion of the pulley 19 by welding or the like, and is rotated by the rotational power of the engine transmitted via a multi-stage V-belt (not shown) that is wound around the pulley 19. In addition, the rotor 4 has a friction surface on one end surface side (the left surface side in FIG. 1) in the axial direction facing the armature 5.

The armature 5 is composed of an inner ring 5b having an annular shape and an outer ring 5a having an annular shape which is arranged on the outer periphery of the inner ring 5b with a constant interval and has a predetermined gap in the axial direction. Are arranged so as to face the friction surface of the rotor 4. In this armature 5, the end faces of the rings 5a and 5b facing the friction surface of the rotor 4 are provided as friction surfaces, respectively, and when the exciting coil 7 is energized, the armature 5 is attracted to the rotor 4 side and becomes the friction surface of the rotor 4. When engaged, it rotates integrally with the rotor 4.

The hub assembly comprises an outer hub 20, an inner hub 21 arranged on the inner peripheral side of the outer hub 20, and a rubber hub 22 connecting the outer hub 20 and the inner hub 21, and when the energization of the exciting coil 7 is stopped, the rotor 4 is rotated. The armature 5 so that a gap of about 0.5 mm is maintained between the friction surface of the armature 5 and the friction surface of the armature 5.
Support.

The outer hub 20 is an annular body having an L-shaped cross section (inverted L-shaped in FIG. 1) and has an outer ring 5 of the armature 5.
It is fixed to a by rivets 23. Inner hub 2
1 is provided in the shape of a stepped cylinder and is fixed to a rotating shaft (not shown) of the refrigerant compressor.

The rubber hub 22 is formed in the outer hub 20 in the radial direction.
Is interposed between the inner peripheral surface of the inner hub 21 and the outer peripheral surface of the inner hub 21 and is fixedly adhered to the both, and when the exciting coil 7 is energized, the armature 5 is attracted toward the rotor 4 side and is deformed in the axial direction. Then, when the energization to the exciting coil 7 is stopped, the elastic force returns the armature 5 to the initial position (the position shown in FIG. 1).

Next, the operation of this embodiment will be described. When the energization of the exciting coil 7 is stopped, the armature 5 is held at a position apart from the rotor 4 by the hub assembly, so that the rotational force transmitted from the engine to the rotor 4 via the V-belt is transmitted to the armature 5. Not, so only the rotor 4 spins on the bearing 18.

When the exciting coil 7 is energized, the magnetic force generated by the exciting coil 7 attracts the armature 5 to the rotor 4 side against the elastic force of the rubber hub 22. As a result, the friction surface of the armature 5 and the friction surface of the rotor 4 are closely contacted and frictionally engaged with each other, whereby the rotational force of the rotor 4 is transmitted to the rotary shaft of the refrigerant compressor through the armature 5 and the hub assembly, The refrigerant compressor is driven.

After that, when the energization of the exciting coil 7 is stopped, a surge voltage is generated at both ends of the exciting coil 7,
This surge voltage is quickly absorbed and extinguished by the surge absorbing device 2 built in the terminal portion 10 of the stator 3.

In the electromagnetic clutch 1 of this embodiment, since the surge absorbing device 2 is built in the terminal portion 10 of the stator 3, the coil space in the stator housing 9 is not reduced and the surge absorbing device 2 is wet. There is no fear of doing it. In addition, the surge absorber 2 is soldered to the terminal plate 14 (caulking, fusing, press fitting,
Excitation coil 7 because it is electrically connected by
The step of connecting with the coil wire and the lead wire 6 is unnecessary, and the number of assembling steps can be reduced.

Further, since the surge absorbing device 2 built in the terminal portion 10 is fixed by the mold resin 17 injected into the terminal portion 10, the surge absorbing device 2 is fixed to the outside of the electromagnetic clutch 1. In addition, it is not necessary to provide a fixing seat or the like, and the strength required for fixing is not required. In addition, the lead portion 2a of the surge absorber 2
Is supported by the receiving seat 13b of the lead wire holding portion 13, so that the deformation of the lead portion 2a due to the resin pressure when the molding resin 17 is injected into the terminal portion 10 can be prevented.

Next, a second embodiment of the present invention will be described. FIG. 6 is a plan view of the terminal portion 10 according to the second embodiment. The electromagnetic clutch 1 of this embodiment is used by connecting a winding resistor 24 in series with the surge absorber 2. This allows
The slip time between the rotor 4 and the armature 5 when the energization of the exciting coil 7 is stopped can be shortened.

The winding resistance 24 is wound around a resin bobbin 25 and is joined to the lead portion 2a of the surge absorbing device 2 by soldering or the like. The lead terminal 24a of the winding resistor 24 is fixed to the bobbin 25 by caulking or the like, and its tip is connected to the flange portion 14d of the terminal plate 14. The surge absorber 2 is housed in the hollow portion of the bobbin 25 in order to prevent the installation space from increasing.

[Brief description of drawings]

FIG. 1 is a sectional view of an electromagnetic clutch.

FIG. 2 is a side view showing a structure of a terminal portion.

3 is a layer cross-sectional view taken along the line AA of FIG.

FIG. 4 is a plan view showing a structure of a terminal portion.

FIG. 5 is a plan view of the terminal portion side of the stator.

FIG. 6 is a plan view showing a structure of a terminal portion (second)
Example).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electromagnetic clutch 2 Surge absorber 2a Lead part 3 Stator 6 Lead wire 7 Exciting coil 7a Terminal wire 8 Spool 9 Stator housing 10 Terminal part 13 Lead wire holding part 13b Receiving seat (supporting part) 14 Terminal plate 15 Base part 17 Mold resin

Claims (3)

[Claims] 1. A stator having an exciting coil for generating a magnetic force by receiving an electric current through a lead wire and provided with a terminal portion for electrically connecting a terminal wire of the exciting coil and the lead wire. An electromagnetic clutch, comprising: a surge absorbing device for absorbing a surge voltage generated when the energization of the exciting coil is stopped, built in the terminal portion. 2. The electromagnetic clutch according to claim 1, wherein the terminal portion is provided integrally with a spool around which the exciting coil is wound, and supports the terminal wire of the exciting coil, and the lead. After the tip of the wire is electrically connected and assembled to the base portion, the terminal plate to which the terminal wire of the exciting coil is electrically connected, and the tip portion of the lead wire are held, The surge absorbing device has a pair of lead portions, which are fixed to a stator housing that houses the exciting coil. The surge absorbing device has a pair of lead portions, and the lead portions are electrically connected to the terminal plate. An electromagnetic clutch characterized by being fixed by a molding resin injected into the terminal portion. 3. The electromagnetic clutch according to claim 2, wherein the lead wire holding portion is provided with a support portion that supports the lead portion of the surge absorbing device.