JPH05332374A - Electromagnetic clutch - Google Patents

Abstract

PURPOSE:To simply and quickly fix a cover and an armature for preventing invasion of oil on a frictional face without using any adhesive. CONSTITUTION:A groove 20 is provided on the inner circumference of an armature 4, and a claw-shaped engagingly locking part 22 provided on the inner circumference of a resin cover 17 is elastically deformed and fitted on a part 21 to be engagingly locked facing to the anti-frictional face 4c of the groove 20. Consequently, the engagingly locked part 21 is forced by the elastic force of the engagingly locking part 22, and the inner circumference of the cover 17 is fixed to the armature 4. The outer circumferential side of the cover 17 is pinched between the armature 4 and the outerring 13 of a rotation transmission device 6, and the armature 4 and the outer ring 13 are caulked and fixed together by a rivet 12, and thereby the seal lip 24 of the cover 17 is pinched and fixed between the armature 4 and the outer ring 13.

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 rotary power, and more particularly to fixing a cover for preventing impurities such as oil from entering the friction engagement surface.

[0002]

2. Description of the Related Art As a conventional technique, the actual fairness is 4-3133.
The technology disclosed in Japanese Patent Publication is known. This technology
A cover for preventing oil from entering the friction engagement surface between the rotor and the armature is attached to the anti-friction surface of the armature. The cover disclosed in the prior art is a non-magnetic metal and is fixed to the armature by an adhesive. The outer peripheral side of the cover is sandwiched between the armature and the leaf spring and crimped by the rivets. The armature and the cover are fixed by adhesion as described above. This is because if only the outer circumference of the cover is fixed to the armature and the inner circumference of the cover is not fixed to the armature, when the rotor and the armature are engaged with each other, the cover and the armature hit each other to generate a sound. Therefore, the inner circumference of the cover is also fixed to the armature with an adhesive.

[0003]

The work of fixing the cover to the armature by using the adhesive is not only troublesome in the work of applying the adhesive, but also the following production is performed until the adhesive fixes the cover and the armature. It had a problem that the work time was long because it could not proceed to the process.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electromagnetic clutch capable of easily fixing a cover and an armature without using an adhesive. In offer.

[0005]

The electromagnetic clutch of the present invention employs the following technical means. The electromagnetic clutch includes a rotor provided with a friction surface, which is rotatably provided, an armature having a friction surface arranged to face the friction surface of the rotor and frictionally engaged with the friction surface, and a machine equipped with the armature. And a rotation transmitting member that is integrally rotated with the armature and is attached to the anti-friction surface side of the armature, and prevents impurities such as oil from entering the friction engagement surface between the rotor and the armature. And a nonmagnetic cover. Then, one of the inner circumference and the outer circumference of the cover is pressed by an elastic force of a locking part provided on the cover to press a locked part provided facing the anti-friction surface of the armature. It is fixed to the armature. The other of the inner circumference and the outer circumference of the cover is sandwiched between the armature and the rotation transmitting body, and is fixed between the armature and the rotation transmitting body by the mechanical coupling means.

[0006]

The lock portion of the cover is pushed into the locked portion of the armature, and the lock portion and the locked portion are fitted together. Then, the locking portion is pressed against the locked portion by the elastic force, and as a result, the locking portion is prevented from shifting toward the anti-friction surface side of the armature. In this way, by preventing the locking portion from shifting toward the anti-friction surface side of the armature, one of the inner circumference and the outer circumference of the cover is fixed to the armature. Further, by disposing the cover between the armature and the rotation transmitting body and fixing the armature and the rotation transmitting body by a mechanical coupling means, the other inner or outer circumference of the cover is sandwiched between the armature and the rotation transmitting body. Fixed.

[0007]

According to the electromagnetic clutch of the present invention, as described above, the cover is fixed to the armature without using an adhesive. Therefore, an adhesive is used to fix the cover and the armature. It is easier than the technology and can be done in a short time. Since the cover and the armature can be fixed easily and in a short time, the electromagnetic clutch can be easily manufactured as a result, and the manufacturing cost of the electromagnetic clutch can be kept low.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an electromagnetic clutch of the present invention will be described based on an embodiment shown in the drawings. [Structure of Embodiment] FIGS. 1 to 5 show an embodiment of the present invention. FIG. 1 is a sectional view of an essential part of an electromagnetic clutch, and FIG. 2 is a sectional view of the entire electromagnetic clutch. The electromagnetic clutch 1 of the present embodiment connects and disconnects rotational power from an engine (not shown) to the refrigerant compressor. This electromagnetic clutch 1
Is roughly divided into a rotor 3 that is rotationally driven by an engine, an armature 4 that frictionally engages with the rotor 3, and
A rotation transmitting body 6 that transmits the rotation transmitted to the armature 4 to the input shaft 5 of the refrigerant compressor, an electromagnetic coil 7 that attracts the armature 4 by a magnetic force when it is energized and frictionally engages with the rotor 3, and this electromagnetic coil And a support member 8 that supports 7.

The rotor 3 is a pulley around which a multi-stage V-belt is stretched, and a housing 9 of the refrigerant compressor has a bearing 10 mounted thereon.
It is rotatably supported via. This rotor 3
It is made of a magnetic material such as iron and has an annular shape with a U-shaped cross section that covers the electromagnetic coil 7. Further, a ring-shaped friction material 11 that enhances the engaging force is fitted on the outer peripheral side of the friction surface 3a that engages with the armature 4. Armature 4
The rotor 3 includes a friction surface 4 a that is arranged to face the friction surface 3 a of the rotor 3 and that engages with the friction surface 3 a of the rotor 3. The armature 4 has a ring-like shape made of a magnetic material such as iron, and is provided with a slit 4b having a long hole that meanders with the magnetic path formed in the armature 4. The rotation transmission body 6 is
It is connected to the armature 4 by a rivet 12 which is a mechanical coupling means, rotates together with the armature 4, and transmits the rotation transmitted to the armature 4 to the input shaft 5. The armature 4 and the rivet 12 are fixed. Outer ring 13, inner hub 14 fastened to input shaft 5, outer ring 13 and inner hub 1
4 and a cushion rubber 15 that allows the armature 4 to be displaced in the direction of the rotation axis. Note that the friction surface 3a of the rotor 3 when the energization of the electromagnetic coil 7 is stopped
And a gap between the armature 4 and the friction surface 4a is about 0.5 mm.

As shown in FIG. 1, a ring shield 16 is fixed to the rotor 3 at the inner peripheral position of the friction surface 3a. The ring shield 16 guides impurities such as oil leaking from between the input shaft 5 and the housing 9 and oil of the bearing 10 to the inner circumference of the armature 4 on the side opposite to the friction surface 4c. Is the inner circumferential protrusion 3b of the rotor 3 and the outer race 10a of the bearing 10.
Has been fixed between.

A cover 17 is attached to the armature 4 on the side opposite to the friction surface 4c. 3 and 4, the cover 17 covers the anti-friction surface 4c side of the armature 4 and prevents impurities such as oil from entering the friction engagement surface between the rotor 3 and the armature 4. It is made of a non-magnetic resin material such as nylon. The cover 17 of the present embodiment surely prevents the oil guided by the ring shield 16 to the inner circumference on the anti-friction surface 4c side of the armature 4 from entering the friction engagement surface. As shown, the inner peripheral edge 17a of the cover 17
Is provided on the frictional engagement surface side (right side in FIG. 1) with respect to the end 16a (left side in FIG. 1) where the ring shield 16 is guided inside the ring shield 16 and discharges oil.
The outer peripheral edge 17b of the cover 17 is bent in the radial direction so as to cut off the oil transmitted to the outer periphery.

Next, the fixing of the armature 4 and the cover 17 will be described. The inner peripheral side of the cover 17 is fixed to the armature 4 by the inner peripheral fixing portion 18, and the cover 17
The outer peripheral side of is fixed between the armature 4 and the rotation transmitting body 6 by the outer peripheral fixing portion 19. Inner circumference fixed part 18
Among the grooves 20 provided along the entire inner circumference of the armature 4, a plurality of claw-shaped engaging members provided on the inner circumference of the cover 17 are provided in the locked portion 21 on the anti-friction surface 4c side of the armature 4. The stopper 22 is elastically deformed and fitted together, and the elastic force of the resin of the stopper 22 presses the locked portion 21, whereby the inner circumference of the cover 17 is fixed to the armature 4.

The outer peripheral fixing portion 19 is fixed between the armature 4 and the outer ring 13 by being sandwiched between the armature 4 and the outer ring 13 by the caulking of the rivet 12, so that the cover 1 is fixed.
As shown in FIG. 2, a seal lip 24 is provided on the inner circumference of a hole through which the base 23 of the rivet 12 provided in the armature 4 is inserted. This seal lip 24
Before being crimped by the rivet 12, as shown in FIG.
It is provided a little longer than the length B of the crimping direction 3 (see FIG. 1). When the rivet 12 is crimped, the seal lip 24 is crushed between the armature 4 and the outer ring 13 and elastically deformed. As a result, the outer periphery of the cover 17 is fixed between the armature 4 and the outer ring 13, and oil leakage between the pedestal 23 and the seal lip 24 is prevented.

[Operation of Embodiment] Next, the assembly for fixing the cover 17 to the armature 4 will be briefly described. First, align the seal lip 24 of the cover 17 with the pedestal 23 of the armature 4 and attach the cover 17 to the armature 4.
Push it to the side. Then, the locking portion 2 on the inner periphery of the cover 17
2 is fitted in the groove 20 on the inner circumference of the armature 4, the locking portion 22 is pressed against the locked portion 21, and the inner circumference of the cover 17 is fixed to the armature 4. Next, the armature 4 with the cover 17 and the outer ring 13 of the rotation transmission body 6 are fixed by caulking with the rivet 12. Then, the seal lip 24 around the pedestal 23 is sandwiched between the armature 4 and the outer ring 13, and the outer periphery of the cover 17 is fixed between the armature 4 and the outer ring 13.

[Effects of the Embodiment] In this embodiment, as shown by the above-described operation, the cover 17 can be fixed to the armature 4 without using an adhesive unlike the conventional case. Therefore, the work of fixing the cover 17 and the armature 4 to each other is easier and can be performed in a shorter time than in the past. As a result, the manufacturing of the electromagnetic clutch 1 is facilitated, and the manufacturing cost of the electromagnetic clutch 1 can be kept low.

[Second Embodiment] FIG. 6 is a sectional view of an essential part of an electromagnetic clutch 1 showing a second embodiment. The inner peripheral fixing portion 18 of this embodiment is provided with a plurality of holes 25 on the inner peripheral side of the armature 4 that spread on the friction surface 4a side, and on the inner peripheral side of the cover 17, a plurality of holes 25 fitted into the holes 25 of the armature 4. Protrusion 26
Of the hole 25 of the armature 4, the protrusion 26 is provided on the locked portion 21 facing the anti-friction surface 4c of the armature 4.
The claw-shaped engaging portion 22 provided on the engaging portion 22 is fitted and the engaged portion 21 is pressed by the elastic force of the resin of the engaging portion 22, whereby the inner circumference of the cover 17 is fixed to the armature 4. Further, in the present embodiment, the pedestal 23 is provided separately from the armature 4, and the pedestal 23 is provided in a washer shape and combined with the flat plate ring-shaped armature 4 to keep the manufacturing cost of the armature 4 low. You can

[Third Embodiment] FIG. 7 is a sectional view of an essential part of an electromagnetic clutch 1 showing a third embodiment. In the above example,
Although the armature 4 is supported by the cushion rubber 15 so as to be displaceable to the rotor 3 side, in the present embodiment, the leaf spring 27 is used.
The armature 4 is displaceably supported on the rotor 3 side by (components of the rotation transmitting body 6). As a result, the seal lip 24 is sandwiched between the leaf spring 27 and the armature 4.

[Modification] In the above embodiment, the cover is made of resin, but aluminum, copper,
It may be formed of a non-magnetic metal such as stainless steel. The outer peripheral side of the cover may be fitted and fixed to the armature, and the inner peripheral side of the cover may be fixed by being sandwiched between the armature and the rotation transmitting body. As an example of the mechanical coupling means, the example in which the armature and the rotation transmitting body are connected by using the rivet is shown, but the armature and the rotation transmitting body may be connected by using other mechanical coupling means such as a screw. .. Although the present invention is applied to the electromagnetic clutch of the refrigerant compressor, the present invention can be applied to all electromagnetic clutches that transmit and cut off power, such as a supercharger and an automatic transmission.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of an electromagnetic clutch (first embodiment).

FIG. 2 is a sectional view of an electromagnetic clutch (first embodiment).

FIG. 3 is a side sectional view of a cover (first embodiment).

FIG. 4 is a front view of the cover (first embodiment).

FIG. 5 is a sectional view of a main part of a cover (first embodiment).

FIG. 6 is a sectional view of an essential part of an electromagnetic clutch (second embodiment).

FIG. 7 is a sectional view of an essential part of an electromagnetic clutch (third embodiment).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electromagnetic clutch 3 Rotor 4 Armature 6 Rotation transmission body 12 Rivet (mechanical coupling means) 17 Cover 21 Locked part 22 Locking part

Claims (1)

[Claims] 1. A rotor rotatably provided with a friction surface, an armature having a friction surface arranged to face the friction surface of the rotor and frictionally engaged with the friction surface, and the armature. Connected by mechanical coupling means,
A rotation transmitting body that rotates integrally with the armature, and a cover of a non-magnetic material that is attached to the anti-friction surface side of the armature and that prevents impurities such as oil from entering the friction engagement surface between the rotor and the armature. In the electromagnetic clutch provided, one of the inner circumference and the outer circumference of the cover presses a locked portion provided facing the anti-friction surface of the armature by an elastic force of a locking portion provided on the cover. The cover is fixed to the armature, and the other of the inner circumference and the outer circumference of the cover is sandwiched between the armature and the rotation transmitting body, and is interposed between the armature and the rotation transmitting body by the mechanical coupling means. An electromagnetic clutch characterized by being fixed.