JPH08219178A - Electromagnetic clutch - Google Patents

Abstract

PURPOSE: To reduce cost of a fixing stay by integrally forming an electromagnetic means fixing stay on a resin member for fixing an electromagnetic coil of the electromagnetic means on a coil housing. CONSTITUTION: A coil housing 61 of a stator part 6 to serve as an electromagnetic means for generating electromagnetic attraction force is made of iron- group metal into a double ring shape having the U-shaped section, an electromagnetic coil 62 and a spool 62a are housed in it and insulated and fixed by a resin member 63. A stay 64 for holding and fixing the stator part 6 to a front housing 5 of a compressing equipment 14 is integrally formed on the resin member 63 by injection molding. The 66-nylon resin excellent in mechanical strength, and containing glass fibers is preferable as a material of the resin. The iron stay individually pressed is not required by the above-mentioned structure, and the large reduction of cost can be realized by decrease of working man-hours owing to decrease of the number of part items, and by reduce the welding process.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic clutch for connecting and disconnecting power transmission, and is suitable for driving a compressor of a refrigerating cycle of an automobile air conditioner.

[0002]

2. Description of the Related Art In a conventional electromagnetic clutch of this type, generally, an iron coil housing of a stator portion holding an electromagnetic coil is formed by press working, and
An iron stay, which is also formed by press working, is welded to the coil housing, and the stator portion is held and fixed to the housing of the compressor by this stay (for example, see Japanese Utility Model Laid-Open No. 64-11438). ).

[0003]

However, in the above-mentioned conventional structure, since the stay, which is a member for holding and fixing the stator portion, is independently pressed by iron and welded to the coil housing, the cost of manufacturing the stay is increased. However, there is a problem in that the number of assembling steps also becomes large and the cost of the electromagnetic clutch increases.

The present invention has been made in view of the above points,
It is an object of the present invention to provide an electromagnetic clutch capable of reducing the manufacturing cost of the stay by forming the stay for fixing and fixing the stator part integrally with the resin member by paying attention to the existence of the resin member for holding the electromagnetic coil.

[0005]

In order to achieve the above object, the present invention employs the following technical means. According to the first aspect of the present invention, the drive side rotating member (1, 2) having the friction surface (2a) and the rotary shaft of the driven side device (4) are rotated while receiving the rotational force from the rotary drive source. The driven side rotating member (13) connected thereto, the electromagnetic means (6) for generating an electromagnetic attraction force by energization, and the driving side rotating member (1,
The armature (9), which is disposed so as to face the friction surface (2a) of (2) and is attracted to the friction surface (2a) of the drive side rotating member (1, 2) by the electromagnetic attraction force generated by the electromagnetic means (6). ), The driven side rotating member (13) and the armature (9) are connected to each other, and the connecting mechanism (10, 11,
12), the electromagnetic means (6) includes an electromagnetic coil (62), a coil housing (61) for housing the electromagnetic coil (62), and the electromagnetic coil (62) in the coil housing (61). Resin member to be fixed (6
3), and the resin member (63) is characterized by an electromagnetic clutch integrally formed with the stay (64) for fixing the electromagnetic means.

According to a second aspect of the present invention, in the electromagnetic clutch according to the first aspect, the stay (64) is formed into a substantially disc shape having a hole (64a) at the center thereof, and the stay (64) has a hole (64a). The peripheral portion is fitted and fixed to the outer peripheral surface of the housing (5) of the driven device (4). According to a third aspect of the invention, in the electromagnetic clutch according to the second aspect, the stay (64) has a hole (64).
A groove (64b) is formed in the peripheral portion of a), while a groove (5b) is formed on the outer peripheral surface of the housing (5) of the driven device (4), and the groove (5b) is formed in the groove (5b). It is characterized in that the hole (64a) of the stay (64) is directly fitted and fixed.

According to a fourth aspect of the invention, in the electromagnetic clutch according to any one of the first to third aspects, there is provided a connector (8) for connecting the electromagnetic coil (62) to an external circuit. The connector holding portion (8a) holding (8) is integrally formed with the resin member (63) together with the stay (64).

According to a fifth aspect of the present invention, in the electromagnetic clutch according to any one of the first to fourth aspects, the drive side rotating member (1, 2) is rotated by receiving a rotational force from an automobile engine. The driven-side device is a compressor (4) of a refrigeration cycle of an automobile air conditioner.

The reference numerals in the parentheses of the above-mentioned means indicate the correspondence with the concrete means described in the embodiments described later.

[0010]

According to the present invention, since the stay for fixing the electromagnetic means is integrally formed with the resin member for fixing the electromagnetic coil to the coil housing, it is a separate body from the conventional product. A pressed iron stay is no longer required, and the number of parts can be reduced to reduce the number of processing steps and the number of welding steps, resulting in a significant cost reduction, which has a great practical effect.

In addition to this, according to the third aspect of the present invention, a crack groove is formed in the peripheral portion of the hole at the center of the resin stay, and the stay is formed in the concave groove of the outer peripheral surface of the housing of the driven device. Since the holes are directly fitted and fixed, it is not necessary to use a mounting bracket such as a circlip when fixing the stay, and the cost can be further reduced.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) In FIGS. 1 and 2, reference numeral 1 denotes a driving pulley, which is rotated by receiving a rotational force from an automobile engine via a belt (not shown). This pulley 1 is a pulley portion 1a having a multiple V groove with which a multiple V belt is engaged.
Are integrally formed and are made of iron-based metal.

Reference numeral 2 denotes a drive side rotor formed in a double ring shape having a U-shaped cross section, which is made of an iron-based metal (ferromagnetic material) and is integrally formed with the pulley 1 by a joining means such as welding. It is joined. A bearing 3 is arranged on the inner peripheral portion of the rotor 2 so that the rotor 2 can be formed by the bearing 3 as shown in FIG.
The cylindrical protrusion 5 of the front housing 5 of the compressor 4 shown in FIG.
It is rotatably supported on a. Here, the compressor 4 is for compressing a refrigerant in a refrigerating cycle of an automobile air conditioner, and may be any known swash plate type, vane type, scroll type or the like.

Reference numeral 6 is a stator portion which constitutes an electromagnetic means for generating an electromagnetic attraction force, and 61 is a coil housing (fixed magnetic pole member) of the stator portion 6, which is made of iron-based metal (strong magnetic material) in a double ring shape having a U-shaped cross section. Magnetic material). An electromagnetic coil 62 and its winding frame 62 a are housed inside the coil housing 61, and are insulated and fixed by a resin member 63.

The resin member 63 has a stator portion 6
A stay 64 for holding and fixing the above to the front housing 5 of the compressor 4 is integrally formed. The integral molding structure of the resin member 63 and the stay 64 will be described in more detail. Both the members 63 and 64 are simultaneously molded by injection molding. As an example of the resin material, glass fiber containing excellent mechanical strength is contained. No. 66 nylon resin is preferable.

At the time of injection molding, a resin injection gate is provided on the end surface A side of the resin member 63 shown in FIG.
The resin member 63 and the stay 64 may be integrally formed by arranging the resin member 63 and the stay 64 on the inner side surface B side or the outer side surface C side and injecting resin from these gates into the molding die. Further, since the stay 64 is made of resin, it is generally necessary to increase the plate thickness as compared with a conventional stay made of iron in order to secure the strength, but the plate thickness of the same degree can be obtained by selecting the resin material. Therefore, the plate thickness of the resin stay 64 may be set in a range of about 1 to 4 times the plate thickness of the conventional stay made of iron.

The stay 64 is formed in a substantially disc shape having a circular hole 64a at the center as shown in FIG. As shown in FIG. 2, the stay 64 is fitted to the circular outer peripheral surface of the front housing 5 of the compressor 4 at the peripheral edge of the circular hole 64a,
It is adapted to be fixed to the front housing 5 by a circlip 7. Reference numeral 8 denotes a connector for electrically connecting the lead wire of the electromagnetic coil 62 to an external circuit, which is provided integrally with the stator 6. In this example, this connector 8
A connector holding portion 8a that covers and holds while electrically insulating is integrally formed with the resin member 63 and the stay 64.

A friction surface 2 extending in the radial direction of the rotor 2.
In a, arc-shaped magnetic blocking grooves 2b, 2c extending in the circumferential direction are provided.
And a magnetic cutoff groove 2b radially outwardly formed.
A friction material 2d is arranged at the position of (1) to improve the transmission torque. Reference numeral 9 denotes an armature arranged so as to face the friction surface 2a of the rotor 2, which is formed of a ferrous metal (ferromagnetic material) in the shape of a ring-shaped flat plate. The armature 9 is provided on the friction surface 2 of the rotor 2 when the electromagnetic coil 62 is not energized.
It is designed to be held at a position (position shown in FIG. 1) that is a predetermined minute distance from a. The armature 9 is also formed with an arcuate magnetic blocking groove 9a extending in the circumferential direction.

A rivet 10 made of iron-based metal is used to fix the armature 9 to a ring-shaped holding member 11 made of iron-based metal. Reference numeral 12 denotes an elastic member formed of rubber into a cylindrical shape, which is a cylindrical portion 11a of the holding member 11.
Is disposed between the inner peripheral surface and the outer peripheral surface of the cylindrical portion 13a of the hub 13, and is integrally molded and integrally connected to both the members 11 and 13.

As the material of the elastic member 12, use is made of rubber which exhibits excellent characteristics in terms of torque transmission and absorption of torque fluctuations in the operating environment temperature range (-30 ° C to 120 °) of the automobile. Is preferred. This elastic member 12 causes the armature 9 to move to the electromagnetic coil 62 by its elastic force.
When not energized, it plays a role of holding the friction surface 2a of the rotor 2 at a position separated from the friction surface 2a by a predetermined minute distance, and also plays a role of absorbing torque fluctuation in the rotation direction.

The hub 13 is made of an iron-based metal, and has a cylindrical portion 13b at the center thereof, and a bolt or the like is attached to the rotary shaft (not shown) of the compressor 4 at the central cylindrical portion 13b. It is fixed by screws. As a result, the hub 13
Are integrally connected to the rotary shaft of the compressor 4. Next, the operation of the first embodiment having the above structure will be described. The rotation of a crank pulley of an automobile engine (not shown) is transmitted to a pulley 1 via a belt (not shown), and the rotor 2 is always rotating integrally with the pulley 1.

In the above state, when the electromagnetic coil 62 is energized from the external circuit through the connector 8 in order to operate the automobile air conditioner, the coil housing 61 passes through the rotor 2 and the armature 9 to reach the coil housing 61. Magnetic flux flows to the returning magnetic circuit. As a result, an electromagnetic attraction force is generated between the friction surface 2a of the rotor 2 and the armature 9, so that the armature 9 resists the axial elastic force of the elastic member 12 (force toward the left in FIG. 1). The second friction surface 2a is sucked and adsorbed.

As a result, the rotor 2 and the armature 9 rotate as a unit, and the armature 9 is further moved by the rivet 10.
The holding member 11, the elastic ring body 12, and the hub 13 rotate together. Therefore, the rotation of the pulley 1 is transmitted to the rotary shaft of the compressor 4 via the hub 13, and the compressor 4 operates.

On the other hand, when the automobile air conditioner is stopped, the electromagnetic coil 62 is de-energized. This allows
Since the electromagnetic attraction force disappears, the armature 9 is separated from the friction surface 2a of the rotor 2 by the axial elastic force of the elastic member 12, and the rotation transmission to the rotary shaft of the compressor 4 is interrupted. Stop. (Second Embodiment) FIGS. 5 and 6 show a second embodiment. In this embodiment, a plurality of radially outward radial portions are formed from the peripheral portion of the circular hole 64a at the center of the resin stay 64 (this embodiment). Then 4)
The cracking grooves 64b are radially provided.

By forming a plurality of crack grooves 64b in the circular hole 64a in the center of the resin stay 64, the peripheral portion of the circular hole 64a in the center of the resin stay 64 is elastically deformed. The resin stay 6
The circular hole 64a at the center of the compressor 4 can be directly fitted and fixed in the ring-shaped groove 5b provided on the outer peripheral surface of the front housing 5 of the compressor 4. Therefore, the circlip 7 in the first embodiment can be eliminated, and the cost can be further reduced.

In both of the above-mentioned embodiments, the circular hole 64a is formed at the center of the stay 64.
The shape of a is not limited to a circle, but may be a non-circular shape such as a polygon. In this case, of course, it is necessary to form the concave groove 5b in a shape corresponding to the non-circular shape of the hole 64a. Further, in the above-described embodiment, the electromagnetic clutch used for driving the compressor of the air conditioner for automobiles has been described, but the present invention is not limited to such an application, and needless to say, can be widely applied to various applications. is there.

[Brief description of drawings]

FIG. 1 is a half sectional side view of a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a mounting structure of a stator portion to a compressor front housing in the first embodiment.

FIG. 3 is a vertical sectional view of a stator portion of the first embodiment.

FIG. 4 is a front view of a stator portion of the first embodiment.

FIG. 5 is a front view of a stator portion according to a second embodiment.

FIG. 6 is a sectional view showing an attachment structure of a stator portion to a compressor front housing in the second embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1, 2 ... Pulley, rotor (driving side rotating member), 4 ... compressor (driven side equipment) 5 ... housing, 5b ... concave groove, 6 ... stator part (electromagnetic means), 61 ... coil housing, 62 ... electromagnetic coil , 6
3 ... Resin member, 64 ... Stay, 64a ... Circular hole, 64b
... Crack groove, 8 ... Connector, 8a ... Connector holding part, 9 ...
Armature, 10 ... Rivet (connecting mechanism), 11 ... Holding member (connecting mechanism), 12 ... Elastic member (connecting mechanism), 13
... Hub (driven side rotating member).

Claims (5)

[Claims] 1. A drive-side rotating member that rotates by receiving a rotating force from a rotary drive source and that has a friction surface, a driven-side rotating member that is connected to a rotating shaft of a driven-side device, and an electromagnetic attraction force when energized. And an armature that is disposed so as to face the friction surface of the drive-side rotating member and that is attracted to the friction surface of the drive-side rotating member by the electromagnetic attraction force generated by the electromagnetic means, and the driven-side rotation. A coupling mechanism that is disposed so as to couple the member and the armature and has an elastic member that is elastically deformable, the electromagnetic means includes an electromagnetic coil, a coil housing that houses the electromagnetic coil, and the An electromagnetic clutch comprising a resin member for fixing an electromagnetic coil to the coil housing, and a stay for fixing the electromagnetic means is integrally formed on the resin member. . 2. The stay is formed in a substantially disc shape having a hole in the center thereof, and a peripheral portion of the hole is fitted and fixed to an outer peripheral surface of a housing of the driven device. The electromagnetic clutch according to claim 1. 3. A break groove is formed in the peripheral portion of the hole of the stay, and a concave groove is formed in the outer peripheral surface of the housing of the driven side device, and the hole of the stay is directly fitted into the concave groove. The electromagnetic clutch according to claim 2, wherein the electromagnetic clutch is fixed. 4. A connector for connecting the electromagnetic coil to an external circuit, and a connector holding portion for holding the connector is integrally formed with the resin member together with the stay. The electromagnetic clutch according to any one of 1. 5. The drive-side rotating member is configured to rotate by receiving a rotational force from an automobile engine, and the driven-side device is a compressor of a refrigeration cycle of an automobile air conditioner. The electromagnetic clutch according to any one of claims 1 to 4.