JPS60573B2 - Manufacturing method of electromagnetic clutch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an electromagnetic clutch suitable for use in a connection between a car cooler compressor and an engine, and more particularly to an improvement in a method for manufacturing a rotor portion of an electromagnetic clutch.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An electromagnetic clutch used in a conventional connection between a car cooler compressor and an engine will be explained with reference to FIGS. 1 to 3.

In FIG. 1, a first rotating body 3 is rotatably supported by a casing 1 of a compressor, which is a fixed part, via a bearing 2. As shown in FIG. This rotary body 3 is made of a magnetic material, and has a V-pulley part 4 which is rotated by an engine (not shown) as a driving means via a V-belt, and has a V-pulley part 4 inside the brackets. It has an annular recess 5 that opens from the casing 1 side. In this recess 5, there is a small electromagnetic space 6 on the inner and outer peripheral surfaces of the recess 5, respectively.
An excitation device 8 is inserted via 7. This excitation device 8 includes an electromagnetic coil 9 that generates an electromagnetic attraction force, and a yoke 10 made of a magnetic material that supports the electromagnetic coil 9 on the casing and forms part of a magnetic path. A movable piece 12 of a second rotary body 11 is opposed to an end surface of the first rotary body 3 on the side opposite to the casing 1 .

This second rotating body 11 includes, in addition to the movable piece 12, a hub 14 connected to the movable piece 12 via a leaf spring 13;
One end is fixed to this hub 14 with a nut 15 or the like,
It has a shaft 16 whose other end is connected to a swash plate of a combustor or the like as a driven means (not shown). As shown in FIG. 2, the surfaces facing the first rotating body 3 and the second rotating body 11, that is, the friction surfaces, are arranged in the same manner, and each has four surfaces forming a predetermined gap. arcuate hole 17
, 18 and the connecting portions 19, 20 of the middle W or W2 provided between these arcuate holes 17, 18, and the triple layer defined by these arcuate holes 17, 18 and connecting portions 19, 20'. It is composed of ring-shaped members 21, 22, and 23.

Furthermore, the movable piece 12 of the second rotary body 11 is formed of a magnetic material, and is shaped so that it has the same shape as the arc-shaped holes 17 and 18, as shown in FIG. Three arcuate holes 24 located between the holes 17 and 18 and forming a predetermined gap, a connecting portion 25 of the middle W3 provided between these arcuate holes 24, and a connecting portion 25 of the arcuate holes. 24 and a double ring-shaped member 26, 27 defined by a connecting portion 25.

In such a configuration, the first rotating body 3 is constantly rotated via a V-belt and a V-pulley 4 (not shown) while the engine is rotating, but when the electromagnetic coil 9 of the excitation device 8 is not energized, The movable piece 12 of the second rotating body 11 is in a state separated from the first rotating body 3 due to the action of the leaf spring 13, so that the second rotating body 11 is not rotated and the "hub 1" is not rotated.
4 and the driven means connected via shaft 16 are also not rotated. On the other hand, when the electromagnetic coil 9 is energized, the arcuate holes 17 and 18 formed in the surface facing the movable piece 12 of the first rotating body 3 and the movable piece 12 of the second rotating body 11 are opened. Due to the magnetic isolation effect with the arcuate hole 24, the main magnetic circuit 0 is connected to the yoke 10, the inner electromagnetic space 6, and the first rotation forming the inner wall of the recess 5, as shown by the broken line in FIG. The inner peripheral wall of the body 3, the inner ring-shaped member 21 of the first rotating body 3, the inner ring-shaped member 26 of the movable piece 12, and the first rotating body 3
a central ring-shaped member 22, an outer ring-shaped member 27 of the movable piece 12, and an outer ring-shaped member 23 of the first rotating body 3.
, the yoke 101 is formed so as to return again through the outer circumferential wall of the first rotary body 3 forming the outer wall of the recess 5 and the outer magnetic space 7, thereby generating an electromagnetic attraction force and moving the movable piece 1
2 is attracted toward the first rotating body 3 against the leaf spring 13, and the movable piece 12 is frictionally engaged with the first rotating body 3.

Therefore, the driving force of the driving means that is being transmitted to the first rotating body 3 is transmitted to the movable piece 12, the leaf spring 13, the hub 14, and the shaft 16 in this order, so that the driven means (not shown) is driven. It has become. In such a conventional electromagnetic clutch, the magnetic flux induced by the excitation device 8 is transmitted not only to the main magnetic circuit but also to the connecting portion 1 of the first rotating body 3.
9, 20 and the connecting portion 25 of the movable piece 12 of the second rotating body 11, the ratio of effective magnetic flux to the total magnetic flux decreases, and in order to obtain the required attractive force, a large electromagnetic flux is required. It has the disadvantage of becoming a clutch.

Further, "the end of the movable piece 12 of the first rotary body 3 and the arcuate holes 18, 19, 24 provided in the movable piece 12 are manufactured by a T-press plate," and "the movable piece 1 of the first rotary body 3
The two friction surfaces of the second end and the movable piece 12 are cut and cut after the press plate operation in order to reduce the magnetic resistance of the electromagnetic attraction force generating part or to stabilize the friction coefficient between the two friction surfaces. It is finished by polishing. At this point, burrs etc. are generated on the processed surfaces of the arcuate holes 18, 19, 24 due to cutting and polishing, and this removal work is done using a file or a rotary bar, but it is time-consuming. However, it is an object of the present invention to provide a method for manufacturing an electromagnetic clutch which minimizes the number of paths for the above-mentioned ineffective magnetic flux and which is easy to manufacture.

The present invention provides a first rotary body connected to a driving means and a second rotary body connected to a driven means facing the first rotary body, at least one of which is arranged with a predetermined gap. A plurality of concave portions are formed at predetermined intervals and are composed of a plurality of ring-shaped portions arranged in the same shape, and extend over adjacent ring-shaped portions at predetermined positions in the circumferential direction of the predetermined gap. A circumferential groove is formed on the inner peripheral surface of each of these recesses, and a coupling member made of a non-magnetic material and having a lower deformation resistance than the ring-shaped member is inserted into these recesses and plastically deformed by pressure. The purpose is to achieve the above object by causing the ring-shaped members to flow into the circumferential groove and generating a bonding force between the ring-shaped members by the breaking force and tension force of the plastically deformed coupling member.

Embodiments of the present invention will be described below based on the drawings. Here, the same or equivalent components as in the prior art example are designated by the same reference numerals. 4 to 6 show an example in which the present invention is applied to a first rotating body.
The first rotating body 3 includes three ring-shaped members 21, 22, and 23 arranged through arc-shaped holes 17 and 18 that form predetermined gaps, that is, a middle T gap and a middle L gap.
At predetermined positions in the circumferential direction of the arcuate holes 17 and 18, there are holes (inner holes) each extending between the adjacent ring-shaped members 21 and 22 or 22 and 23 and being wider than the insides T and L of the arcuate holes 17 and 18, respectively. A plurality of recesses 31 and 32 having diameters) D, , D2 are provided at predetermined intervals, for example, four each. Circumferential grooves 3 are provided on the inner peripheral surfaces of these recesses 31 and 32, respectively.
3 and 34 are provided. At this time, the recesses 31 and 32 are formed in a cylindrical shape penetrating from the movable one side end surface of the first rotating body 3 to the recess 5 for attaching the exciter, and the recesses 33 and 32
4 is formed at the center of each of the recesses 31 and 32 in the axial direction to a depth of about 0.5 ribs. Said recess 3
1 and 32 are made of a material that is non-magnetic and has a lower deformation resistance than the ring-shaped members 21, 22, 23 made of a magnetic material such as iron, such as copper, aluminum, or an alloy thereof, and has an outer diameter of D. , , D2 are inserted into the cylindrical coupling members 35 and 36.

The joint villages 35 and 36 are substantially entirely surrounded by the recesses 31 and 32 and a pair of molds 37 and 38, and the convex mold 37 is inserted into the recesses 31 and 32. The connecting members 35 and 36 are made to plastically flow by being pressurized and inserted toward the
As a result, the connecting members 36, 36 are caused to flow into the circumferential grooves 33, 34, and the shearing force and tension force of the connecting members 35, 36 securely connect each ring-shaped member 2, between 1 and 22, and between 22 and 23. is combined with According to this embodiment as described above, the ring-shaped members 21, 22, 23 can be mechanically and firmly fixed by the connecting portions 35, 36 made of non-magnetic material.

On the other hand, "because it is magnetically blocked, the ring-shaped member 2
The leakage magnetic flux between 1 and 22 and between the ring-shaped members 22 and 23 is extremely small, and the leakage magnetic flux between the first rotating body 3 and the second rotating body 11 is extremely small.
A larger electromagnetic attraction force can be obtained between the movable piece 12 and the movable piece 12. In other words, if the electromagnetic attraction force is the same as that of a conventional electromagnetic clutch, a smaller electromagnetic clutch of the excitation device 8 can be manufactured. Further, according to this embodiment, each ring-shaped member 2
Since the arcuate holes 17, 18 between 1, 22, 23 are circular, burrs, burrs, etc. generated at the ends of each ring-shaped member 21, 22, 23 during cutting and polishing can be easily removed by turning. Can be removed.

Further, ``the diameters D, D2 of the coupling members 35, 36 are each lj
Since it is larger than the middle T, T2 of the arc-shaped holes 17, 18 between the ring-shaped members 21 and 22 or 22 and 23,
The connection strength between each ring-shaped member 21 and 22 or between 22 and 23 that resists the rotational torque is very large, and also in the direction of the bag, the amount flowing into the circumferential grooves 33 and 34 causes a large resistance. Therefore, the connection strength against axial force is also very large. Further, the coupling members 35 and 36 are connected to the ring-shaped portion 21,
Since the rings 22 and 23 are only partially arranged in a dotted manner at predetermined positions, each ring-shaped member 21 and 2 can be formed with a small amount of material.
2, 23 connections can be made, which is economical. Next, FIGS. 7 to 9 show other examples in which the present invention is implemented in the first rotating body.

This embodiment is different from the embodiments shown in FIGS.
, 23, each ring-shaped part village 21, 22, 23 is connected integrally with a connecting part 39, 4 strands of thickness T3, T4, middle W4, W5, respectively. The other points are the same. As a result, the recesses 31 and 32 are formed into cylindrical shapes with bottoms.
After insertion, each ring-shaped member 21, 22, 2 is plastically deformed.
3 are mechanically connected to produce the first rotating body 3. According to this embodiment as described above, the mechanical bonding strength is achieved by uneven breaking force and tension force of the coupling members 35 and 36 made of non-magnetic materials, so that the coupling portion 3 serves as a path for the ineffective magnetic flux.
9 and 40' can be made as small as possible, thereby improving the adsorption performance between the first rotary body 3 and the movable piece 12 of the second rotary body 11 due to electromagnetic attractive force.

In addition, each ring-shaped member 21, 2 is connected by the connecting portions 39, 40.
2 and 23 are constructed as one piece, the gap between each ring-shaped part village 21, 22, and 23, that is, the arc-shaped hole 17
, 18 can be formed accurately without using pick-up tools or the like, and the mold is not only a convex mold 37, but the work cost can be reduced. Furthermore, each ring-shaped member 21,
The burrs, burrs, etc. generated at the ends of the ends of the parts 22 and 23 during cutting and polishing can be easily removed by turning, as in the previous embodiment. , 36 are also similar to the previous embodiment. In addition, in each of the above embodiments, the recesses 31 and 32
Although the connecting members 35 and 36 are circular or cylindrical in shape, the present invention is not limited thereto, and may be in other shapes, such as a square prism or a triangular prism.

However, a cylindrical shape has the advantage of being easy to machine. Furthermore, in each of the above embodiments, the present invention has been described with reference to the first rotary body 3; however, the present invention is not limited to this, and the present invention is applied to the movable piece 12 of the second rotary body 11. is also applicable in the same way. As described above, according to the present invention, it is possible to minimize the number of paths of ineffective magnetic flux, and it is possible to provide a method for manufacturing an electromagnetic clutch.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional electromagnetic clutch, Fig. 2 is a reduced sectional view taken along line 0-D in Fig. 1, and Fig. 3 is a cross-sectional view taken along line 0-D in Fig. 1.
FIG. 4 is a front view of a rotating body showing an embodiment of the electromagnetic clutch manufactured by the manufacturing method according to the present invention, and FIG. 5 is a cross section taken along line V-V in FIG. 4. Figure, 6th
The figure is a sectional view taken along the Machi-W line in FIG. 4, FIG. 7 is a front view of a rotating body showing another embodiment of the present invention, and FIG. 8 is a sectional view taken along the side line in FIG. FIG. 9 is a sectional view taken along the line M in FIG. 7. DESCRIPTION OF SYMBOLS 1... Casing as a fixed part, 3... First rotating body, 8... Excitation device, 9... Electromagnetic coil, 11...
... second rotating body, 12... movable piece, 13... plate spring,
17, 18, 24... arcuate hole, 21, 22, 23, 2
6, 27... ring-shaped part village, 31, 32... recessed part,
33, 34... Circumferential groove, 35, 36... Connecting member, 39, 40... Connecting portion. Many 2 figures, many 3 figures, many figures/Figure 7, younger brother, 8 figures? figure

Claims (1)

[Claims] 1. A first rotating body having a portion made of a magnetic material and connected to a driving means, and a portion made of a magnetic material facing the magnetic material portion of the first rotating body. A second rotary body connected to a driven means, and an electromagnetic coil that includes the first and second rotary bodies to constitute a magnetic circuit, and at least one of the first and second rotary bodies. A method for manufacturing an electromagnetic clutch comprising a plurality of ring-shaped members made of a magnetic material and arranged concentrically with a gap of a predetermined width, the ring-shaped members adjacent to each other at a predetermined position in the circumferential direction of the gap. A plurality of recesses are formed at predetermined intervals, and a circumferential groove is formed on the inner circumferential surface of each of these recesses, and a ring-shaped member made of a non-magnetic material has a deformation resistance in the recess. A small coupling member is inserted into the circumferential groove, and these coupling members are plastically deformed under pressure to flow into the circumferential groove, and the shearing force and tension force of the plastically deformed coupling members cause the adjacent ring-shaped members to A method for manufacturing an electromagnetic clutch characterized by generating a bonding force. 2. The method for manufacturing an electromagnetic clutch according to claim 1, wherein each of the ring-shaped members is formed of a continuous integral piece in a portion where the recess is formed. manufacturing method.