KR850000345B1 - Method for producing a magnetic notatable member for an electromagnetic clutch - Google Patents

Abstract

This invention refers to a processing method for a magnetic rotatable member for an electromagnetic clutch. In the method of manufacturing a ring-shaped magnetic substance(101), which has an annular flange(13) and a radiated flange(14), the object of this invention curtails the quantity of discarded material conspicuously. In general, the circular spaced part is installed in the electromagnetic coil and has a U-type section.

Description

Processing method of magnetic rotating member for electromagnetic clutch

1 and 2 and 3 are cross-sectional views of a conventional electromagnetic clutch.

4A and 4B are cross-sectional views of a conventional magnetic rotating member.

5a to 5e are cross-sectional views of the magnetic rotating member according to the processing step of the present invention.

6a to 6c is a cross-sectional view of the magnetic rotating member according to the machining step in another day in the present invention.

7a and 7b is a cross-sectional view of the magnetic rotating member according to the machining step in another aspect of the present invention.

The present invention relates to an electromagnetic clutch, and more particularly, to a method of processing a magnetic rotating member for an electromagnetic clutch.

Electromagnetic clutches installed in a device with a drive shaft to selectively drive the device by an external drive source are already known in US Pat. Nos. 3,044,594 and 3,082,933 and the like.

The electromagnetic clutch as described above is composed of a magnetic pulley rotatably installed in the housing of the apparatus and rotated by an external driving source along the belt and a rotating disc fixed to the driving shaft of the apparatus. When the electromagnetic coil or electromagnet provided in the pulley is operated, the rotation disc is pulled toward the pulley by the magnetic force, so that the rotation of the pulley is transmitted to the drive shaft. In addition, the pulley is provided with an annular space portion and a belt groove member in which the electromagnetic coil is installed. Therefore, since the shape of the pulley is complicated, it takes a long time to manufacture the pulley. That is, after a long forging process, machining for accurate dimensions is required. Since a considerable amount of material is removed from machining, many materials are discarded in the conventional pulley manufacturing method. Therefore, the unit cost of the electromagnetic clutch is also increased.

In order to reduce the weight of the pulley, the pulley is composed of two parts: a ring magnet made of magnetic material such as steel and a belt groove member of aluminum or aluminum alloy fixed to the outer surface of the ring magnet. However, the surface of the magnet part facing the rotating disc may be reduced, which may reduce the rotational transmission force. In order to increase the surface of the magnet portion facing the rotating disc, an annular flange protruding radially from the axial end on the outer surface of the annular magnetic body facing the rotating disc is formed. Therefore, the shape of the annular magnetic body is relatively complicated. Also, if the machining step is followed by forging, the amount of material discarded is significant. When the annular plate is pressed to form the annular magnetic body, a large amount of material is removed by machining to form a radially protruding annular flange.

In addition, the annular magnetic body as a part of the pulley of the magnetic material or as part of the pulley becomes more complicated in shape since it must be provided with a stop for the bearing on which the pulley is installed.

The object of the present invention is firstly to improve the processing method of the annular magnetic portion or magnetic rotating member of the pulley in the electromagnetic clutch, and secondly, to save time and waste materials in the processing of the magnetic rotating member, and thirdly, the exact dimensions. Fourth, it is to easily process the magnetic rotating member of the magnetic rotating member having a large magnetic friction surface facing the rotating disk.

The method according to the invention has a generally U-shaped cross section, which constitutes an annular space segment in which an electromagnetic coil should be installed, and a magnetic rotating member for electromagnetic clutch, which has a stop for the bearing means to which the rotating member is to be installed. It is for. In this method, an annular blank composed of an annular cylinder portion, an outer annular cylinder portion, and an annular plate portion at an axial end portion connecting the inner and outer annular cylinder portions at its axial end by press-drawing a magnetic disc of a predetermined size prepared in advance. And ironing the outer surface of the outer annular cylinder to form an annular flange projecting radially on the outer axial end of the outer surface such that the axial end surface of the annular plate portion coincides with the axial end surface of the annular flange. After cutting the outer edge of the other axial end of the inner annular cylinder to form an annular thin portion, the thin portion is pressed to bend radially inward to form a stop for the bearing.

Before press-drawing the magnetic disk to form an annular blank in which the inner surface of the outer annular cylinder portion is inclined to be ironed, the outer annular cylinder portion whose thickness increases gradually toward the annular plate portion of the axial end is bent radially inward. The inner surface of the annular cylinder portion may be perpendicular to the annular plate portion at the axial end.

In addition, the magnetic disk may be press-drawn to form a cup-shaped annular blank, and then drawn again (reverse drawing) to form a desired annular blank.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

1 shows a conventional electromagnetic clutch for selectively driving a compressor to be used between an engine and a compressor, in which a pulley 1 is mounted on a bearing 2 provided in a tubular extension 3 of a compression housing 4. It is installed. The pulley 1 is rotated by an automobile engine (not shown) along the belt shown in dashed lines and has a plurality of concentric stimulating surfaces 1a annular at its axial ends. The drive shaft 5 of the compressor extends along the tubular extension 3 of the housing, the hub 6 is fixed to the extended end of the drive shaft 5, and the annular rotating disc 7 is the leaf spring 8. By being in contact with the hub 6, the rotating disc and the annular concentric magnetic pole faces each other with an axial space therebetween. The electronics 9 provided in the tubular extension part 3 are fixedly located in the annular space part formed in the pulley 1, and supply magnetic flux for attracting the rotating disc 7 to the magnetic pole surface 1a.

Therefore, when the electromagnet 9 is operated, the drive shaft 5 rotates together with the pulley 1 by the output of the engine. When the function of the electromagnet 9 is stopped, the pulley 1 rotates in the engine but the compressor is not driven. Do not.

In such a conventional electromagnetic clutch, the pulley 1 is processed by machining a single piece of magnetic material such as steel and then machining. However, as stated, there are some drawbacks to the weight and its construction.

FIG. 2 shows another example of the conventional electromagnetic clutch, and separates and manufactures the annular magnetic body 11a and the annular V-shaped groove member 11b by using the press molding method to form the annular V-shaped groove member 11b. After fixing to the magnetic body (11a) by welding with each other to produce a pulley (1). In this method, the magnetic friction surface at the axial end is reduced as described above. To increase this surface, an annular flange projecting radially at an axial end opposite the rotating disc is formed on the outer surface of the magnetic body as shown in FIG.

The pulley 10 shown in FIG. 3 includes an annular magnetic body 101 and a belt groove member 102 made of a magnetic material such as steel. The annular magnetic body 101 is comprised by the annular plate part 101c of the axial end part which connects the outer annular cylinder part 101a, the inner annular cylinder part 101b, and the inner and outer annular cylinder parts 101a and 101b. . The electromagnet 9 is fixed to the annular space portion defined by the subdivisions 101a-101c. Concentric slits 12a and 12b are formed in the annular plate portion 101c of the axial end to form a concentric annular magnetic pole surface. An annular flange 13 protruding radially from the outer surface of the outer annular cylinder portion 101a facing the rotating disc 7 is formed, and is opposite to the annular plate portion 101c in the inner annular cylinder portion 101b. The radial flange 14 formed at the end serves as a stop for the bearing 2. The belt groove member 102 having the V-ditch groove 102a for accommodating the belt on the radially outer surface of the annular magnetic body 101 is manufactured by die casting an aluminum alloy.

This structure is similar to that filed in Korean Patent Application No. 1468 filed May 9, 1979.

Although the magnetic body 101 is formed by the press working method in the structure of FIG. 3, it must be machined to form the annular flange 13 and the radial flange 14. That is, after press working, as shown in FIG. 4a, the compressed body is partially machined to form the annular flange 13 and the radial flange 14. Thus, the amount of material discarded is not so reduced. As an alternative, as shown in FIG. 4B, the annular magnetic body 101 may be forged to form the annular flange 13 and the radial flange 14. However, after forging, machining is required to obtain accurate dimensions. Thus, the amount of material that is discarded is still large.

An object of the present invention is to provide a method for processing an annular magnetic body having an annular flange and a radial flange, which can significantly reduce the amount of waste material. The method according to the invention is characterized by press-drawing, ironing, bending and cutting.

An example of the present invention will be described with reference to FIGS. 5A through 5E as follows.

First, as shown in FIG. 5A, a magnetic material disc A having a predetermined size is prepared. As for magnetic materials, any magnetic materials can be used as long as drawing, ironing and bending deformation are possible. One example of magnetic materials is hot rolled mild steel sheet SPHE of JIS G3131. (Composition: phosphorus 0.030 w / o, sulfur 0.035 w / o, carbon 0.10 w / o, manganese 0.50 w / o and the rest iron)

The magnetic disc A press-drawing process forms an annular blank B composed of the inner annular cylinder portion b ₁ , the outer annular cylinder portion b _2, and the axial end portion b ₃ as shown in FIG. 5B. Center C marked by the intersection line is removed by drilling at the end of the press-drawing process.

If the punching die is not combined with the drawing die, the magnetic disk A is punched in the front and back of the press-drawing process to remove the central portion C. FIG.

Then the annular light outer annular axial end of the cylinder portion b _2, such as by moving the outer annular cylinder surface layer of the material of the b ₂ was added to iron to the rank B in the circumferential portion of the annular plate portion b _3, at a 5C Fig. An annular flange 13 is formed in the groove.

The portion of the material removed from the outer surface of the outer annular cylinder portion b ₂ is indicated by the intersection line portion d _1, and the portion where the removed material forms the annular flange 13 is indicated by the intersection line portion d ₂ .

In addition, the blank B to form a cyclic addition of the cutting inside the annular cylinder portion b of the outer edge of the _first cutting sikimeuroseo remove inner annular cylindrical portion ₁ b of the thin shaft section of the annular ends (14 '). The cut off portion in FIG. 5d is shown by the intersection line d ₃ . The annular thin portion 14 'is then pressed and bent radially inward to form a radial flange 14 as in FIG. 5E. Therefore, it consists of an outer annular cylinder part 101a, an inner annular cylinder part 101b, and the annular plate part 101c of the axial end part which connects two cylinder parts by the axial end part, and the radial flange 14 and the annular flange An annular magnetic body 101 having 13 is completed.

In this example, the magnetic material is manufactured by drawing, ironing, cutting and pressing, so that the processing is easy, the processing time can be shortened, the accuracy of the dimension can be reduced, and the amount of material to be removed is considerably small and discarded. The amount of material is also significantly reduced.

Ironing may be carried out after the cutting step and / or the bending operation.

Referring to Figure 6a to Figure 6c another example of the present invention will be described.

As shown in FIG. 5A, the magnetic disk A having a predetermined size is press-drawn to process the inner annular cylinder portion b ₁ 'and the outer annular cylinder portion b ₂ ' and the annular plate portion b ₃ at the axial end of FIG. Form an annular blank B consisting of '. The annular blank B 'is an outer annular cylinder portion b _2, characterized in that the inner surface is inclined that, toward the outer annular cylinder portion b _2' of the axial end annular plate portion b ₂ increasing the thickness of the as of.

The annular blank B 'can be produced by a method similar to the method of forming the annular blank B in the above-described example. However, it differs from the above example in that the shape of the die defining the inner surface of the outer annular cylinder portion has an inclined surface that matches the inclined inner surface of the outer annular cylinder portion b ₂ ′.

Next the outer annular cylinder portion b ₂ bent radially inwardly, annular plate portion in an axial end portion the inner surface of the b ₃ '' outer annular cylinder portion b ₂ in connection with "annular plate portion b ₃ of the axial ends to the vertical Do it. Therefore, as shown in FIG. 6B, the outer surface of the outer annular cylinder portion b ₂ ′ is inclined.

After the bending operation, an ironing operation is applied to the annular blank B 'to form a radial annular flange 13 as shown in FIG. The ironing operation is similar to the above example. However, since the outer surface of the outer annular cylinder portion b ₂ ′ is inclined, the amount of material removed from the outer surface of the outer annular cylinder portion b ₂ ′, that is, the amount of material moved to form the annular flange 13 is described above. Less than one example. In FIG. 6C, the amount of material removed and the amount of material moved are shown by the intersection lines d ₁ ′ and d ₂ ′, respectively.

6a, 6b and 6c, if the outer diameter of the outer annular cylinder b ₂ ′ after press-drawing is l ₁ , the inner diameter of the outer annular cylinder b ₂ ′ before and after bending is l ₂ and outer The diameter is L _3, which is in a relationship of L ₁ > L ₃ > L ₂ . The outer and inner diameters of the outer annular cylinder portion b ₂ ′ after ironing are l ₃ and l ₂ , respectively, and the outer diameter of the annular flange 13 is l ₄ larger than l ₁ .

Therefore, in this example, ironing is easier than in the case of the above-described example.

The radial flange 14 is made by bending the thin annular portion formed by cutting off the outer edge portion of the inner annular cylinder portion b ₁ ′ in the inner radial direction as in the case of the above-described example.

As described above, the annular blank B or B 'can be formed in a single press-drawing process. However, depending on the die used, it may be possible to press-draw twice. That is, as the first press-drawing, a cup-shaped annular blank as shown in FIG. 7A is formed, and then an annular blank B or B 'is formed by a second drawing or reverse drawing.

The pulley is completed by forming a belt groove member made of aluminum or an aluminum alloy on the outer surface of the annular magnetic body according to the present invention as the die casting method described in the aforementioned patent application.

As described above, the present invention can be easily processed, accurate dimensions can be obtained, the amount of material to be discarded can be reduced, the magnetic friction surface area can be increased, and a small and light magnetic clutch rotating member can be processed.

Claims (1)

It is for processing the magnetic rotating member for electromagnetic clutch, which generally has a U-shaped cross section to form an annular space part in which the electromagnetic coil should be installed, and a stop for the bearing means in which the rotating member should be installed. Press-drawing a magnetic disk (A) of a predetermined size prepared in the inner circumferential cylinder portion (b ₁ ) and the outer cyclic cylinder portion (b ₂ ) and the axial end portion connecting the inner and outer annular cylinder portion at its axial end portion An annular blank (B) consisting of an annular plate portion (b ₃ ) is formed, and an outer surface of the outer annular cylinder portion (b ₂ ) is ironed to form an annular flange (13) projecting radially from the axial end of the outer surface. sikimeuroseo the annular plate portion ₍₃ b), the axial end surface and to ensure the axial end surface of annular flange 13, inner annular cylindrical portion of the other axial end ₍₁ b) of the In the processing method of the outer edge parts of the cutting sikimeuro of annular thin portion 14 'is formed after the electromagnetic clutch for the magnetic rotary member to form a stop for the chugae by press-working a thin portion by bend radially inside bearing.

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