JPS5817232A - Electromagnetic clutch - Google Patents

Abstract

PURPOSE:To lessen distorsion in a rubber part of an electromagnetic clutch so as to reduce the length of a shaft by providing the electromagnetic clutch with a pair of hubs having projections for clamping the rubber in the direction of rotation. CONSTITUTION:An electric current is applied to an exciting coil 7 so as to adsorb a rotary main body 3 and an armature 12, thereby to transmit power. A cushion rubber 16 is interposed between the armature 12 and a hub 17 integral with a shaft 20. A projection 26 of a metallic retaining plate 13 fixed on the armature 12 and a projection 25 of the hub 17 fixed on the shaft 20 are extended toward the interior of the cushion rubber 16 and disposed in such a manner as to clamp a part of the rubber in the direction of rotation.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a two-way electromagnetic shaft used for intermittent power transmission, etc., and its application is not limited to cars, but it is suitable for use in compressors for car coolers, for example. It is.

The conventional electromagnetic clutch has a rotating body 3 as shown in Fig. 1.
is the cylindrical protrusion l112 of the front housing 1 of the compressor.
is supported by a bearing 4 held by a circlip 5, and a ring-shaped fixed joint 6 is housed in a ring-shaped groove between the outer and inner circumferential parts of the rotating main body 3. The electromagnetic coil 1 is insulated and fixed to the frame 8, and the fixed joint 6
The rotating body 3 is fixed by welding or the like to a support plate 8 which is fixed to the front housing 1 by a circlip 10), and the rotating main body 3 is 31) Multi-rotation is transmitted to the KV Zori (not shown). It is changed from K to E. On the other hand, on the rotating shaft 20 of the compressor, there is a nut 22 and a susolin washer 23.
The cough stick 17 is tightened and fixed, and the cough stick 17 is suctioned and brought into close contact with the rotating base 3 (by the outer periphery sandwiching the annular gap 16 and the electromagnetic coil 1). Ah! Metal holding plate 1 fixed to Teyua 12 with rivets 15
It is divided into two parts, the inner circumferential part of which is 3, and the outer and inner circumferential parts are merely circular parts in contact with the rubber 16, and have a protruding shape toward f A @ 4C. has not appeared at all.

In the conventional configuration as described above, the rim part 16 is easily twisted, so the rim part 16 cannot be made much smaller due to the need to maintain the strength of the t-ram part 160. Therefore, it is difficult to reduce the overall shape of the clutch. It was one.

The present invention has been made in view of the above points, and consists of a hub connected to an armature gear and transmitting the rotation of the armature to a rotating shaft, which has two parts sandwiching an annular gap, and each of the two parts is a gap part. To provide an electromagnetic latch whose latch portion is not easily twisted by providing a protruding portion extending toward the latch and partially sandwiching the latch in the rotating direction, thereby reducing the size of the latch portion as a whole. The purpose is to

The present invention will be described below with reference to embodiments shown in the drawings.

Fig. 2 shows an embodiment of the present invention, in which 1 is a 7-ent housing of a compressor for compressing refrigerant in a refrigerated Nicle;
Bolts (not shown) on the compressor body have been identified. 2. is a cylindrical protrusion 10 that supports the rotating main body 3 and serves as a fixing member;
The rotating main body 3 is made of a magnetic material (soft steel in this example), and its inner peripheral portion is rotatably supported by the cylindrical protrusion 2 by a bearing 4. Reference numeral 5 denotes a circlip for fixing the bearing 4. The zero-rotation upper body 3 has a friction surface 31 on one side (the right side in the figure), and a boo 93' on the outer periphery.
b is S-connected.

Further, a ring-shaped groove 3o is formed between the inner and outer circumferences of the rotating main body 3, and a ring-shaped fixed yoke 6 is housed in the ζO groove 3o. 1. With Hiro electromagnetic film,
It is insulated and fixed to the inside of the fixed yoke 6 by a frame 8 made of a laminated resin material.

Electromagnetic = line 1 and line V-4 (not shown) are connected to the vehicle's on-board power supply battery via a control circuit.

9 is a support plate for the fixed yoke 6, and its outer periphery is
(by welding, etc.) on the side surface of the inner circumferential part of the filter, and by the inner periphery of the filter clip 10! >: ycx is placed in the housing 1. A V belt (not shown) is connected to the B rotating body 3Q nori 3b, and the rotation of the automobile engine (E not shown) is transmitted to the rotating body 3 via this V belt. Ru.

A 12-wire disc-shaped armature made of magnetic material (mild steel in this example) is placed on the side of the rotating main body 3, and is a friction member that faces the friction surface 3 & of the rotating main body 3 through a predetermined gap. It has a surface 12&. As shown in Figure 4 (&) and Figure 4 (Figure 4), which is a cross-sectional view taken along the line B-B, it is a ring-shaped metal holding plate formed by Zores, which forms one part of the armature 12. It is fixed by rivets 15 and 24 via several leaf springs 14 at several places around the circumference of the body.

16 is a cylindrical cushion gym, which relieves the torsional impact load transmitted to the compressor when the clutch operates.
The outer circumference of both sides is bonded to the annular metal holding plate 13, and the inner surface is bonded to the outer circumference of the hub 17. ζζ, the metal holding plate 13 is provided with a protrusion 26 facing the comb eye 16 as shown in FIG. 4 (IL) and FIG. 4 (FIG. 3- which is a front view). and ji3ffiQ(6), which is a cross-sectional view at the Moum line.
As shown in the figure, a protrusion 25 is provided in the center of a portion 17' of the hub 17 that faces the metal holding plate 13, and the protrusion 25 and the protrusion 26 move in the direction of one rotation. ♂mu16 i (it's shaped like it's sandwiching the middle).

20 is a rotating shaft of the compressor connected to f17.

21 is a flat key inserted into the fitting part of the hub 17 and the rotating shaft 200), and the flat key 21 is inserted into the fitting part of the hub 17 and the rotating shaft 20, and then the nut 22 and the spring washer 23 are used. It is tightened and fixed.

Next, the operation of the electromagnetic clutch having the above configuration will be explained. First, during connection, the electromagnetic coil IK is energized to generate magnetism and magnetize the rotating main body 8, which rotates by receiving the driving force from the engine (via the V-belt). As a result, the friction surface 1 of the armature 12 is applied to the friction surface 3 of the rotary body 3.
2 The turtles are attached to each other by suction, and the main body of rotation rotates 30 times using the leaf spring 14.
The information is transmitted to the hub IT via the shoe comb 16. Conversely, to cut off the transmission of power, it is sufficient to cut off the power to the electromagnetic coil 1 to eliminate the magnetism. In this case, the armature 12 returns to the original position 4 by the reaction force of the leaf spring 14. . At that time, the cushion rubber 16 is attached to the metal holding plate 1
Since it is somewhat sandwiched in the rotational direction between the protrusion 26 of No. 3 and the protrusion 25 of F17, the torsional impact load can be alleviated in a state where twisting is difficult.

Note that by appropriately selecting the arrangement of the metal holding plate 13 and the opposing portion 17' of the part f17, it is possible to position the annular cutout support member 16 inside the armature 14, which greatly reduces the axial length. It is also possible to shorten it.

As described above, in the present invention, the hub that transmits the rotation of the armature to the rotating shaft is divided into two parts: the metal holding plate that sandwiches the annular rubber, and the part of the hub that faces this. Each has a protruding part extending toward the rubber part and sandwiching a part in the same rotation direction, so
The rubber part becomes difficult to twist. Figure 1 is a sectional view of a conventional electromagnetic clutch, and Figure 2 is a sectional view of an electromagnetic clutch according to the present invention. Fig. 3(a) is a front view of the hoop that sandwiches the annular bim according to the present invention, and Fig. 6(b)
) is a sectional view taken along line A-A of Figure 3 (aJ), and Figure 4 (
a) is a front view of the metal holding plate that sandwiches the annular grip, and Fig. 4 (
b) is a sectional view taken along line BB in FIG. 4(a).

3... Rotating main body, 7... Excitation coil, 12... Armature, 13... Metal holding plate, 16... Cushion rubber, 1T... Hub, 20... Compressor shaft, 25° 26... Protrusion.

Agent Asamura Hao 4 other people (0) Figure 3 (bl (.) Figure 4 (bl 8"

Claims (1)

[Claims] a rotating support that rotates in response to a driving force from a driving source; an armature that faces the rotating main body through a predetermined gap;
The excitation coil is energized by the application of a voltage and attracts the armature and the rotating body, and the hub is connected to the armature and transmits the rotation of the armature to the rotating shaft. 1. An electromagnetic clutch comprising two parts that are sandwiched between each other, and each of the two parts is provided with a protruding part that extends toward a trum part and that partially sandwiches a part in the rotational direction.