WO1997044595A1

WO1997044595A1 - Core for electromagnetic clutch

Info

Publication number: WO1997044595A1
Application number: PCT/JP1997/001648
Authority: WO
Inventors: Yoshiharu Matsui
Original assignee: Yuugenkaisha Matsuikougyou
Priority date: 1996-05-17
Filing date: 1997-05-16
Publication date: 1997-11-27

Abstract

A core for an electromagnetic clutch includes an outer core member (3) provided with a ring-shaped first bottom (2) inside a tubular outer wall (1) and an inner core member (6) provided with a ring-shaped second bottom (5) outside a tubular inner wall (4). The inner core member (6) is fitted into the inside of the outer core member (3) in such a way that the inner wall (4) and the outer wall (1) are opposed to each other and the first bottom and the second bottom (5) are superposed on each other, thereby forming a coil housing portion (8) among the outer wall, the inner wall and the portions of the first and second bottoms defined between both walls, and forming a housing space (9) inside the inner wall (4). An inside insulator (40) is provided outside the inner wall of the inner core member integrally provided with the ring-shaped second bottom outside the tubular inner wall. An electromagnetic coil is wound around the periphery of this inner insulator, and the outside of the solenoid coil is covered with an outside insulator (60). This inner core member is arranged inside the tubular outer wall of the outer core member from which the first bottom projects inward, and the first bottom and the second bottom are superposed on each other, and the solenoid coil is surrounded by the outer wall, the inner wall and the superposed first and second bottoms. An inner surface (1a) of an upper portion (50) of the outer wall has a size such that the inner surface (1a) is not in close contact with an outer surface (5a) of the second bottom when the inner core member is press-fitted, while an inner surface (1b) of a lower portion (51) of the same outer wall has a size such that the inner surface (1b) is in close contact with the outer surface when the inner core member is press-fitted. Each of the outer and inner core members is formed by pressing a metal plate.

Description

Description Title of Invention Core for Electromagnetic Clutch Technology

The present invention relates to a core for an electromagnetic clutch used in automobiles, power industrial machines and the like. Background art

Electromagnetic clutches are used in various machines to transmit power intermittently. For example, they are used in compressors for air conditioners of automobiles and automatic transmissions of automobiles.

Fig. 13 is a cross-sectional view showing an example of an electromagnetic clutch used for a compressor of an automotive air conditioner. The electromagnetic clutch includes an electromagnetic coil 7 wound in a ring shape, a circular core 20 having a ring groove-shaped coil housing portion 8 for housing the same, a coil housing 20 and an outer peripheral surface of the core 20. A rotatable rotor 11 that is shaped so as to cover the opening surface of the part 8 but is not in contact with the core 20, and is located close to the friction surface 12 of the rotor 11 A rotatable armature 13 is provided. In this electromagnetic clutch, when a current is applied to the electromagnetic coil 7 while the rotor 11 is rotating, the rotor 11 is excited, and the armature 13 adjacent thereto is attracted to the friction surface 12 of the rotor 11 and comes into contact with the rotor 11. Amateur 1 3 rotates with 1 1 overnight. When the power supply to the electromagnetic coil 7 is stopped, the excitation of the rotor 11 is released, and the amateur 13 attracted by the rotor 11 is separated from the row 11 by the retraction body 18 and the amateur 13 Rotation stops. That is, the rotation of the rotor 11 is intermittently transmitted to the amateur 13 when the power supply to the electromagnetic coil 7 is ON / 0FF. In the electromagnetic clutch shown in FIG. 13, a burry 14 is attached to the outer periphery of the rotor 11, and the pulley 14 is rotated by a V-belt 15 connected to the engine. The rotating shaft 17 of the compressor 16 is driven when the armature 13 is rotated. In addition, the power supply to the electromagnetic coil 7 is controlled to be ON / OFF by the controller of the air conditioner.When the engine is started and the switch of the air conditioner is turned on while the engine is running around 11 minutes, A current flows from the controller to the electromagnetic coil 7 to drive the rotating shaft 17 of the compressor 16. In addition, even when the air conditioner is operating, when the controller controls the power supply to the electromagnetic coil 7 to ONZO FF according to the temperature inside the vehicle, the rotating shaft 1Ί of the compressor 16 rotates and stops intermittently in response to this, and the air blown into the vehicle Is maintained at a predetermined temperature. The core 20 used in the electromagnetic clutch shown in FIG. 13 has conventionally been manufactured by a manufacturing process as shown in FIGS. 15 (a) to 15 (g).

1. Prepare a thick ring-shaped steel plate 24 as shown in Fig. 15 (a). The steel sheet 24 is subjected to a bond treatment (bond light treatment) to enhance workability in press working.

2. The steel plate 24 is pressed by cold forging to form a ring groove-shaped coil housing 8 as shown in FIGS. 15 (b) and (c), and other members (the inner wall 1 of the rotor 11 of FIG. 13). 1a, a bearing 19, etc.) are formed into a circular core 20 having an accommodation space 9 capable of accommodating the same.

3. The core 20 is subjected to an annealing process (annealing process) to reduce residual strain left on the core 20 after pressing.

4. As shown in Fig. 15 (d), the opening end face 28 of the core 20 is cut and smoothed, and the interval between the core 11 and the rotor 11 (Fig. 13) arranged opposite to the core 2 () is reduced. Avoid contact with the mouth. Thus, the core 20 is completed.

5. Usually the core 20 has mounting hardware to attach it to the compressor 16 (It is usually called a flange.) It is distributed in the state of the core assembly shown in Fig. 4 with 10 attached. Therefore, in this case, a separately press-formed flange 1 () is attached to the back side of the core 20 by welding as shown in FIGS. 15 (e) and (T). The flange 10 is provided with a screw hole 10a for screwing to the compressor 16 and a protrusion 10b for positioning at the time of mounting.

6. Usually, in the core 'assembly, an electromagnetic coil 7 is set in a coil accommodating portion 8 of the core 20 as shown in Fig. 15 (g).

In the core manufacturing method shown in Fig. 15, a coiled part with a substantially U-shaped cross-section must be formed by a single cold forging press on a round piece of steel. Was needed. However, for that purpose, a bond process is required to perform deep narrowing, and large strain is accumulated and remains in the core after performing the narrowing process. Therefore, an annealing process (to eliminate or reduce the strain) is performed. Annealing treatment) was required. For this reason, there was a problem that it took a long time to manufacture the core and the cost of the core was increased. Disclosure of the invention

An object of the present invention is to provide a low-cost electromagnetic clutch core that is easy to manufacture. The electromagnetic clutch core of the present invention has the following configuration to achieve this object.

The first electromagnetic clutch core has a ring-shaped second bottom plate outside the cylindrical inner peripheral wall, inside the outer core member having a ring-shaped first bottom plate integrally provided inside the cylindrical outer peripheral wall. An inner core member provided on a bottom plate is combined with an outer peripheral wall and an inner peripheral wall so that the outer peripheral wall and the inner peripheral wall face each other and the first bottom plate and the second bottom plate are overlapped. A groove-shaped coil accommodating portion capable of accommodating an electromagnetic coil is formed between the first bottom plate and the second bottom plate, and an accommodating space capable of accommodating other members is formed inside the inner peripheral wall. .

The second electromagnetic clutch core has a ring-shaped first bottom plate provided inside a cylindrical outer peripheral wall. The inner core member provided on the ring-shaped second bottom plate outside the inner peripheral wall is provided on the inner side of the outer core member having a flange integrally provided therein and the outer peripheral wall and the inner peripheral wall. Combines the first and second bottom plates facing each other so as to be overlapped with each other so that the electromagnetic coil can be mounted between the first and second bottom plates between the outer peripheral wall, the inner peripheral wall, and both peripheral walls. A groove-shaped coil housing portion is formed, and a housing space portion provided inside the inner peripheral wall and capable of housing other members is formed.

In the third electromagnetic clutch core, an inner insulating member is provided outside an inner peripheral wall of an inner core member in which a ring-shaped second bottom plate is integrally provided outside a cylindrical inner peripheral wall. An electromagnetic coil is wound around the outer periphery, the outside of the electromagnetic coil is covered with an outer insulating member, and a ring-shaped first bottom plate is integrally formed outside the inner core member inside the cylindrical outer peripheral wall. A first bottom plate and a second bottom plate are overlapped with an outer core member, and an electromagnetic coil is surrounded by the first bottom plate and the second bottom plate overlapped with the outer peripheral wall and the inner peripheral wall. The fourth electromagnetic clutch core is provided with an inner insulating member outside the inner peripheral wall of the inner core member in which a ring-shaped second bottom plate is integrally provided outside the cylindrical inner peripheral wall. An electromagnetic coil was wound around the outer periphery, the outside of the electromagnetic coil was covered with an outer insulating member, and a first bottom plate and a flange were formed inside the cylindrical outer peripheral wall outside the inner core member. A first bottom plate and a second bottom plate are overlapped with an outer core member, and an electromagnetic coil is surrounded by the first bottom plate and the second bottom plate overlapped with the outer peripheral wall and the inner peripheral wall. The fifth electromagnetic clutch core has a ring-shaped second bottom plate inside the outer core member provided with a ring-shaped first bottom plate inside the lower part of the cylindrical outer peripheral wall, and a ring-shaped second bottom plate outside the cylindrical inner peripheral wall. An electromagnetic clutch core for press-fitting the provided inner core member so that the outer peripheral wall and the inner peripheral wall inside thereof face each other and the first bottom plate and the second bottom plate are overlapped with each other. The outer peripheral surface of the second bottom plate is formed so that the outer peripheral surface force is not tightly contacted when the inner core member is press-fitted, and the outer peripheral surface of the lower inner peripheral surface of the outer peripheral wall is closely contacted when the inner core member is press-fitted. It is formed in a size that can be touched.

The sixth electromagnetic clutch core has a first bottom plate provided inside a lower portion of a cylindrical outer peripheral wall. A cylindrical inner core member in which a ring-shaped second bottom plate is provided outside the cylindrical inner peripheral wall inside the outer core member having a flange provided inside the outer core member, and an inner peripheral wall inside the outer peripheral wall. And a first bottom plate and a second bottom plate are pressed together so that the first bottom plate and the second bottom plate overlap with each other. The inner peripheral surface of the upper part of the outer peripheral wall is outside the second bottom plate when the second bottom plate is press-fitted. The outer peripheral wall is formed so as not to be in close contact with the outer peripheral wall, and the inner peripheral surface at the lower portion of the outer peripheral wall is formed in such a size that the outer peripheral surface is in close contact when the second bottom plate is pressed.

A seventh electromagnetic clutch core is formed by pressing each of the outer core member and the inner core member by pressing a metal plate in each of the above-described electromagnetic clutch cores. The eighth electromagnetic clutch core is obtained by press-fitting the inner core member into the outer core member in each of the above-described electromagnetic clutch cores.

In a ninth electromagnetic clutch core, the first bottom plate of the outer core member and the second bottom plate of the inner core member are fixed by any fixing means. It becomes.

In the tenth electromagnetic clutch core, in each of the aforementioned electromagnetic clutch cores, a convex portion is formed on at least one of the first bottom plate of the outer core sound material and the second bottom plate of the inner core member, Is pressed to form one or both of the first bottom plate and the second bottom plate into a thick wall. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 (a) is a perspective view showing an example of an inner core member used for the electromagnetic clutch core of the present invention, and FIG. 1 (b) is an XX cross-sectional view of (a). FIG. 2 (a) is a perspective view showing an example of an inner insulating member used for the electromagnetic clutch core of the present invention, and FIG. 2 (b) is a diagram in which the inner insulating member of (a) is disposed outside the inner core member. Partial sectional view of a state. Fig. 3 is a partial vertical cross-sectional view of a state where an electromagnetic coil is wound around the outside of the inner insulator. Fig. 4 (a) is a partial vertical cross-sectional view of the electromagnetic coil wound around the outer side of the inner insulating member with the outer insulating member arranged, and Fig. 4 (b) is a perspective view showing an example of the outer insulating member. Fig. 5 (a) shows the electromagnetic clamp of the present invention. FIG. 5 (b) is a perspective view showing an example of an outer core member used for the latch core. FIG. 6 (a) is a perspective view of another example of the outer core member, FIG. 6 (b) is an X_X cross-sectional view of (a), and FIG. 6 (c) is a partial vertical cross-section showing an example of the electromagnetic clutch core of the present invention. FIG. Fig. 7 (a) is a partial cross-sectional view showing the state where the inner insulating member is arranged outside the inner core member, Fig. 7 (b) is a perspective view showing another example of the inner insulating member, and Fig. 7 (c) is the inner side. Fig. 7 (d) is a partial cross-sectional view of the electromagnetic coil wound around the outside of the insulator, and Fig. 7 (e) is a partial cross-sectional view of the outer coil with the outer insulator covered. FIG. 7F is a perspective view showing another example, and FIG. 7F is a partial cross-sectional view showing another example of the electromagnetic clutch core of the present invention. Fig. 8 (a) is a partial sectional view of another example of the inner core member, and (b) (()) is a partial sectional view showing a different example of the outer core member. It is a figure of other examples of the core for electromagnetic clutches of the invention, (a) is a perspective view of an inner core member, (b) is a XX sectional view of (a), (o) is a perspective view of an outer core member, (D) is a cross-sectional view taken along the line X-X of (c), (e) is a partial cross-sectional view of the electromagnetic clutch core, (f) is a detailed view of the outer core member, and FIGS. FIGS. 3A and 3B are diagrams of another example of the electromagnetic clutch core, in which FIG. 3A is a perspective view of an inner core member, FIG. 3B is a cross-sectional view taken along line X-X of FIG. (D) is a cross-sectional view of (j) taken along line X-X, (e) is a partial cross-sectional view of the electromagnetic clutch core, and (a) and (b) are other examples of the electromagnetic clutch core of the present invention. (A) shows an inner core member having a protrusion protruding from the upper surface of the second bottom plate inside the outer core member. (B) is a plan view of the inner core member of (a), and Figures 12 (a) to (e) are different press-fit states of the inner core member of the electromagnetic clutch core of the present invention. Fig. 13 is a partial cross-sectional view showing an example of a conventional electromagnetic clutch, Fig. 14 (a) is a perspective view showing an example of a conventional electromagnetic clutch core, and Fig. 14 (b) is an X-axis of (a). Fig. 15 (a) to (g) are explanatory views showing a method of manufacturing a conventional electromagnetic clutch core by cold forging. BEST MODE FOR CARRYING OUT THE INVENTION A first example of an embodiment of an electromagnetic clutch core of the present invention will be described below. This electromagnetic clutch core includes two parts, an outer core member 3 shown in FIG. 5 (a, b) and an inner core member 6 shown in FIG. 1 (a, b). In the outer core member 3 shown in FIGS. 5A and 5B, a ring-shaped first bottom plate 2 is formed all around the lower end of the cylindrical outer peripheral wall 1. The inner core member 6 of (a, b) has a ring-shaped second bottom plate 5 formed around the entire outer periphery of the lower end of the cylindrical inner peripheral wall 4 having a smaller diameter than the outer peripheral wall 1. An accommodation space 9 capable of accommodating other components is formed inside.

As shown in FIG. 2 (b), an inner insulating member 40 is provided on the inner peripheral wall 4 of the inner core member 6 and the outer side of the second bottom plate 5 in FIG. 1 (a, b). Electromagnetic coil 7 is wound as shown in Fig. 3 (a). In this case, as shown in FIG. 2 (b), the inner peripheral member 40 is disposed on the cylindrical peripheral wall clearance 41 disposed outside the inner peripheral wall 4 of the inner core member 6 and on the second bottom plate 5. A ring-shaped bottom plate insulating portion 42 and a ring-shaped upper plate insulating portion 43 provided above and opposed to the ring-shaped bottom plate insulating portion 42 are integrally formed of resin, and are formed from above the inner core member 6. The outer peripheral wall insulating portion 41 is disposed outside the inner peripheral wall 4, the bottom plate insulating portion 42 is disposed on the second bottom plate 5 of the inner core member 6, and the electromagnetic coil 7 is wound around the outer periphery of the peripheral wall insulating portion 41. It is.

As shown in FIG. 4 (a), the outer insulating member 60 is disposed on the outer side of the electromagnetic coil 7 wound around the inner insulating member 40, as shown in FIG. As shown in FIG. 4 (b), the outer insulating member 60 is formed into a cylindrical shape with a resin, and a part of the outer insulating member 60 in the radial direction is cut at a cutting portion 54, and is opened by hand from the cutting portion 54 by hand. When the 配置 is expanded, it is placed outside the electromagnetic coil 7 as shown in Fig. 4 (a). It is so close.

As shown in FIG. 4 (a), the outer side of the inner core member 6 where the outer insulating member 6◦ is arranged is provided inside the cylindrical outer peripheral wall 1 as shown in FIG. 5 (a, b). The bottom plate 2 protrudes from the body The outer core member 3 is covered with the first bottom plate 2 and the second bottom plate 5, and the outer side of the electromagnetic coil 7 is formed by the first bottom plate 2 and the second bottom plate 5 laid on the outer peripheral wall 1 and the inner peripheral wall 4. It is enclosed.

A flange cover is attached below the first bottom plate 2 in FIG. The electromagnetic coil 7 is protected by placing a ring-shaped lid on the upper plate insulating portion 43 of the inner insulating member 40. Other members, for example, the inner wall 11a of the rotor 11 and the bearing 19 as shown in FIG. 13 are accommodated in the accommodation space 9 inside the inner peripheral wall 4 in FIG. 5 (a). The lead wire (not shown) of the electromagnetic coil 7 shown in FIG. 5A is drawn out from the outlet passing through the first bottom plate 2 and the second bottom plate 5.

The electromagnetic coil 7 wound as shown in FIG. 3 (a) may be solidified with an insulating agent such as resin. In this case, it is preferable to fill the space of the winding layer of the electromagnetic coil 7 with an insulating material to solidify the electromagnetic coil 7, and then arrange the outer insulating member 60 outside the electromagnetic coil 7. The filling of the insulator can be performed after the outer insulating member 60 is disposed outside the electromagnetic coil 7 or after the outer core member 3 is covered. In these cases, an insulating agent is filled from a gap between the electromagnetic coil 7 and the outer insulating member 60. If there is no gap, a hole for filling may be formed in the outer insulating member 6〇 or the outer core member 3 or the like, and filling may be performed from there.

The core for an electromagnetic clutch of the present invention can also be as shown in FIGS. In the outer core member 3 in FIG. 6 (a, b), a first bottom plate 2 is formed inside a cylindrical outer peripheral wall 1 and a flange 10 is formed in a body inside the first bottom plate 2, and a central portion inside the inside is formed. The through hole 21 is open.

What is shown in FIG. 7 (a, b) is the inner fastener 40. This is formed integrally with resin so that the bottom plate insulating portion 42 protrudes in a ring shape outside the lower portion of the cylindrical peripheral wall insulating portion 41. As shown in FIG. 7 (a), the inner insulating member 40 is placed on the outer side of the inner core member 6, and a peripheral wall insulating portion 41 is arranged outside the inner peripheral wall 4 of the inner core member 6. On the second bottom plate 5 of 6, a bottom plate clear part 42 is arranged. Outer wall insulation 4 1 An electromagnetic coil 7 is wound around the side, and the outside is covered with an outside insulation G0. As shown in Fig. 7 (e, f), the j-side insulation 60 is made of resin by separating the outer peripheral insulation 6 1 placed outside the electromagnetic coil 7 and the upper insulation 6 2 placed on the upper surface of the electromagnetic coil 7. It is formed in one piece.

On the outer side of the inner core member 6 around which the electromagnetic coil 7 is wound as described above, a ring-shaped first bottom plate 2 is provided inside the ring-shaped outer peripheral wall 1. The electromagnetic coil 7 is surrounded by the first bottom plate 2 and the second bottom plate 5 which are placed so that the first bottom plate 2 and the second bottom plate 5 overlap each other, and are overlapped with the outer peripheral wall 1 and the inner peripheral wall 4.

The inner insulating member 40 and the outer insulating member 60 may be formed of a material other than resin, for example, rubber, cloth, leather, or the like as long as they are insulating agents. For example, an insulating tape, a sheet made of glass fiber, or the like may be used. Further, a material obtained by applying a thick insulating material and curing the same may be used.

The outer peripheral wall 1 of the outer core member 3 and the inner peripheral wall 4 of the inner core member 6 shown in FIGS. 5 and 6 have the first bottom plate 2 and the second bottom plate 5 thicker than the upper end side, and the electromagnetic coil 7 Although the magnetism generated from is easily passed through the first bottom plate 2 and the second bottom plate 5, the thickness of the outer peripheral wall 1 and the inner peripheral wall 4 may be uniform from top to bottom. In any case, it is desirable from the viewpoint of the passage of the force magnetism that the total thickness of the first bottom plate 2 and the second bottom plate 5 is 5 mm or more. Further, in FIGS. 5 (a) and 6 (c), since the inner core member 6 is press-fitted inside the outer core member 3, the inner peripheral surface 1a of the outer peripheral wall 1 of the outer core member 3 and the inner core member 6 The outer peripheral surface 5a of the second bottom plate 5 is in close contact with the outer peripheral surface 5a, so that there is no gap between them, but even if there is a slight gap between the inner peripheral surface 1a and the outer peripheral surface 5a, Since the first bottom plate 2 of the core member 3 and the second bottom plate 5 of the inner core member 6 are overlapped, there is no particular obstacle to the passage of magnetism.

The outer core member 3 shown in FIG. 5 (a, b) and FIG. 6 (a, b) and the inner core member 6 shown in FIG. 1 (a, b) can be manufactured as follows.

1. Production of outer core member 3. ①. Punch a metal plate for stamping to make a disk, and then punch a hole in the center of the disk. The punching of the disc and the drilling of the disc can also be performed simultaneously in a single press.

②. To manufacture the outer core member 3 shown in Fig. 5 (a, b), press the above disk to form a substantially L-shaped and cylindrical cross-section, and then raise the cylinder. This portion is defined as the outer peripheral wall 1, and the portion marked with 橫 is defined as the first bottom plate 2.

When manufacturing the outer core member 3 of FIG. 6 (a, b), the disk is pressed to form an outer core member 3 having a disk 22 inside the outer peripheral wall 1, and this circle is formed. The outer peripheral portion of the plate 22 is a first bottom plate 2 and the inside thereof is a flange 10 for attaching to a compressor or the like. The flange 10 is formed one step lower than the first bottom plate 2, and has a through hole 21 in the center. The flange 10 can be provided with screw holes or protrusions for fixing to the compressor.

2. Create inner core member 6.

①. Create a disk by punching a metal plate for breath, then punch out the center of the disk and make holes in the disk. The punching of the disc and the drilling of the disc can be performed simultaneously in one press operation.

(2) By pressing this disc, the inner core member 6 having a substantially inverted L-shaped cross section and a ring shape is formed as shown in Fig. 1 (a, b). The inner core member 6 has a raised portion as the inner peripheral wall 4 and a lateral portion as the second bottom plate 5. The dimensions of the second bottom plate 5 are such that when the inner core member 6 and the outer core member 3 are assembled as shown in FIG. 5 (a), the outer peripheral edge 5a of the second bottom plate 5 is tightly closed to the inner peripheral surface 1a of the outer peripheral wall 1. The inner core member 6 is fixed to the inside of the outer core member 3 simply by being pressed in while being pressed (press-fitted) while being in contact with the inner core member 6.

Although the inner core member 6 is press-fitted and fixed inside the outer core member 3, the inner core member 6 is not pressed into the outer core member 3, but the two members 3 and 6 are loosely fitted. From the first bottom plate 2 and the second bottom plate 5 by spot welding, It may be fixed by any fixing means such as fixing, riveting, and caulking.

In the electromagnetic coil ffl core of the present invention, when the total thickness of the superimposed first bottom plate 2 of the outer core member 3 and the second bottom plate 5 of the inner core member 6 is larger, magnetism is more easily passed. In order to increase the wall thickness of the first bottom plate 2 and the second bottom plate 5, it is conceivable to use a thick metal plate to be pressed. As shown in FIG. 8, the first bottom plate 2 of the outer core member 3, Both the second bottom plate 5 of the inner core member 6 is pressed and squeezed to form a convex portion 30, and the convex portion 30 is crushed to form the first bottom plate 2 and the second bottom plate 5 into a thick wall. You may do. The protrusion 30 may be formed on only one of the first bottom plate 2 and the second bottom plate 5.

Another embodiment of the electromagnetic clutch core of the present invention will be described with reference to FIGS. This electromagnetic clutch core is assembled by press-fitting the inner core member 6 of FIG. 9 (a, b) inside the outer core member 3 of FIG. 9 (c, d) as shown in FIG. 1 (e). It is a thing.

The inner core member 6 is formed with a cylindrical inner peripheral wall 4 having a smaller outer diameter than the cylindrical outer peripheral wall 1 of the outer core member 3, and the inner peripheral wall 4 has a draft so as to taper inward. A ring-shaped second bottom plate 5 is provided on the entire outer periphery of the lower end of the inner peripheral wall 4. The outer core member 3 has a ring-shaped first bottom plate 2 formed on the entire inner circumference at the lower end of a cylindrical outer peripheral wall 1 (FIGS. 9 c and d).

The outer peripheral wall 1 is formed so that the upper part 50 is gradually turned upward, and the outer peripheral wall 1 is formed so as to extend outward from a perpendicular line 0—◦ to the first bottom plate 2 in FIG. 9 (d), and the inner peripheral surface 1 a of the upper part 50 is formed. The inner diameter of the inner core member 6 is set such that the outer peripheral surface 5a of the inner core member 6 does not come into close contact with the inner peripheral surface 1a when the second bottom plate 5 is press-fitted. The lower part 51 of the outer peripheral wall 1 is vertical or almost vertical in the vertical direction (a taper that spreads outward slightly upward by the draft angle of the mold). The inner diameter of the inner peripheral surface 1b is set such that the outer peripheral surface 5a is in close contact with the inner peripheral surface 1a when the second bottom plate 5 is press-fitted.

By adopting such a structure, the outer peripheral wall 1 of the outer core member 3 as shown in FIG. When pressing the inner core member 6 inside the inner wall, the outer peripheral surface 5a of the second bottom plate 5 is pushed smoothly up to halfway without closely contacting the inner peripheral surface 1a of the upper part 5◦ of the outer peripheral wall 1. In rare cases, the outer peripheral surface 5a of the second bottom plate ") comes into close contact with the inner peripheral surface 1b when approaching the lower portion 51 of the outer peripheral wall 1, and is press-fitted and fixed.

When the depth L (Fig. 9f) of the lower part 51, which is vertical or almost vertical, is 1 to 1.5 times the thickness of the second bottom plate 5, the force that can easily press-fit the second bottom plate 5 and securely fix it It can be deeper or shallower.

Also, the outer peripheral wall 1 and the inner peripheral wall 4 inside the outer peripheral wall 1 face each other by press-fitting and fixing the second bottom plate 5, and the second bottom plate 5 is superimposed on the inner side (upper) of the first bottom plate 2, and the outer peripheral wall 1 and the inner peripheral wall The coil housing portion 8 is formed so as to be surrounded by the first bottom plate 2 and the second bottom plate 5 which are overlapped with the bottom plate 4. The coil accommodating portion 8 has a substantially U-shaped groove shape in cross section, and is formed in a ring shape around the entire outer peripheral wall 1 and the inner peripheral wall 4 to accommodate the donut-shaped electromagnetic coil 7. It is possible. As shown in FIG. 9 (e), a housing space 9 is formed inside the inner peripheral wall 4, and other members, for example, the inner wall 11 a of the opening 11 shown in FIG. It can accommodate 9 mag.

In the core for an electromagnetic clutch of the present invention, the inner core member 6 of FIG. 10 (a, b) is press-fitted inside the outer core member 3 of FIG. 10 (c, d) as shown in FIG. 10 (e). Can be assembled. The inner core member 6 in FIG. 10 (a, b) has the same shape as the inner core member 6 in FIG. 9 (a, b).

The outer core member 3 in FIGS. 10 (c) and 10 (d) has a disk 22 integrally formed on the entire inner circumference at the lower end of the outer peripheral wall 1. The disk 22 has a flange 10 formed in a body inside the first bottom plate 2, and a through hole 21 opened in the center of the flange 10. The outer peripheral wall 1 is formed so that the upper part 50 is gradually expanded outward with the upper part 50 facing upward, and the inner diameter of the inner peripheral surface 1 a of the upper part 50 is changed to the inner peripheral surface 1 a when the second bottom plate 5 is press-fitted. The lower part 51 of the outer peripheral wall 1 is made vertical or almost vertical in the vertical direction (a reverse taper that spreads slightly outward by the draft angle of the mold). 5 out of 1 The inner peripheral surface 1b has such a size that the outer peripheral surface 5a is in close contact with the inner peripheral surface 1b when the second bottom plate 5 is press-fitted.

With such a structure, when the inner core member 6 is press-fitted inside the outer peripheral wall of the outer core member 3 as shown in FIG. 10 (e), the outer peripheral surface 5a of the second bottom plate 5 Is pressed smoothly without contacting the inner peripheral surface 1a of the upper part 50 of the outer peripheral wall 1 halfway, and when it reaches the lower part 51 of the outer peripheral wall 1, the second bottom plate is attached to its inner peripheral surface 1b. The outer peripheral surface 5a of 5 is tightly contacted and press-fitted and fixed.

By this press-fitting and fixing, the outer peripheral wall 1 and the inner peripheral wall 4 inside thereof are opposed to each other, the second bottom plate 5 is superimposed on the inner side (upper) of the first bottom plate 2, and the outer peripheral wall〗 and the inner peripheral wall 4 are superimposed. A coil housing portion 8 formed by the first bottom plate 2 and the second bottom plate 5 is formed. The coil accommodating portion 8 has a substantially U-shaped groove shape in cross section, and is formed in a ring shape by being surrounded by the entire outer peripheral wall 1 and the inner peripheral wall 4 to form a donut-shaped electromagnetic coil 7. Can be accommodated. As shown in FIG. 10 (e), a housing space 9 is formed inside the inner peripheral wall 4, and other members, for example, the inner wall 11 of the mouth 11 shown in FIG. 13 are formed there. a, Bearings 19 and so on can be accommodated.

Also in the case of this embodiment, in order to make it easier for the magnetism generated from the electromagnetic coil 7 (FIG. 14) to pass through the first bottom plate 2 and the second bottom plate 5, the outer wall 1 and the inner wall 4 are used. The first bottom plate 2 and the second bottom plate 5 can be made thick. In order to increase the thickness of the first bottom plate 2 and the second bottom plate 5, the first bottom plate 2 of the outer core member 3 and the second bottom plate of the inner core member 6 are formed in the same manner as in FIGS. 8 (a) to 8 (c). Protrusions 30 are formed on each of the bottom plates 5, and the first and second bottom plates 2 and 5 can be made thick by crushing the protrusions 30 by pressure. In this case, it is preferable from the working surface that the pressing of the convex portion 30 is performed before, for example, the inner core member 6 is pressed into the outer core member 3.

The inner core member 6 is shown in FIG. 11 (a, b), and the protrusion 31 protruding upward on the upper surface of the second bottom plate 5 as shown in FIG. 11 (a) is shown in FIG. 11 (b). The inner core member 6 is press-fitted inside the outer core member 3 at intervals in the circumferential direction of the second bottom plate 5 as shown in FIG. Before, during or after press-fitting, the protrusion 31 is pressurized and crushed, and the second bottom plate 5 is moved outward by the amount of the crushed protrusion 31 (left side of FIG. 11a: lower portion 5 of the outer core member 3). ], The outer peripheral surface 5a of the second bottom plate 5 and the inner peripheral surface lb of the lower portion 51 of the outer core member 3 are deeply adhered to each other, and the bottom plates 2, 5 are press-fitted and fixed. As a result, the force of magnetic flow through the bottom plates 2 and 5 is further increased.

The inner core member 6 shown in FIG. 12 (a) is also provided with a plurality of downwardly projecting protrusions 31 at the bottom surface of the second bottom plate 5 at intervals in the circumferential direction. The core member 6 is press-fitted inside the outer core member 3 and the second bottom plate 5 is pressed at the time of or after press-fitting to crush the protrusion 31, and the second bottom plate 5 is moved outward by an amount corresponding to the crush of the protrusion 31. (Left side of Fig. 13a: inner peripheral surface 1b1 rule of lower part 51 of outer core member 3) and extends to outer peripheral surface 5a of second bottom plate 5 and inner peripheral surface of lower part 51 of outer core member 3. As the contact with 1b is deepened, the contact between the second bottom plate 5 and the first bottom plate 2 is also deepened, and the press-fitting of both bottom plates 2 and 5 is ensured, and the magnetic flow through both bottom plates 2 and 5 is reduced. It is intended to be more dense.

The inner core member 6 shown in FIG. 12 (b) is provided with a plurality of downwardly projecting protrusions 32 on the bottom surface of the second bottom plate 5 in two rows and spaced apart in the circumferential direction, and the inner core member 6 is provided on the side. The core member 6 is pressed into the inside of the outer core member 3, and at or after the press-fitting, the second bottom plate 5 is pressed to crush both rows of the projections 32, and the second Bottom plate 5 force ^ Extends to the outside (left side of Fig. 12b: inner peripheral surface 1b side of lower part 51 of outer core member 3), and outer peripheral surface 5a of second bottom plate 5 and lower part 5 of outer core member 3 The contact between the inner peripheral surface 1b of 1 and the second bottom plate 5 and the first bottom plate 2 is also deepened, and the press-fitting of the both bottom plates 2 and 5 is ensured, while passing through both the bottom plates 2 and 5. This is to make the magnetic flow more dense.

The inner core member 6 shown in FIG. 12 (c) has a plurality of arc-shaped depressions 33 provided at the bottom surface of the second bottom plate 5 at intervals in the circumferential direction, and the inner core member 6 has the first bottom plate 2 of the outer core member 3. A plurality of protrusions 34 protruding upward on the upper surface are provided at intervals in the circumferential direction of the first bottom plate 2, and the inner core member 6 is recessed into this side when the inner core member 6 is pressed into the outer core member 3. Align the projections 3 and 4 to fit them closely together, and then deepen the close contact between the second bottom plate 5 and the first bottom plate 2 to The force of the magnetic flow through the plates 2 and 5 is more dense.

In the outer core member 3 shown in FIG. 12D, a bead 35 projecting upward is provided on the upper surface of the first bottom plate 2 in a ring shape in the circumferential direction of the first bottom plate 2, and the inner core member 6 is provided on this side. When the beads 35 are pressed into the inside of the outer core member 3, the beads 35 are pressed and crushed to deepen the close contact between the second bottom plate 5 and the first bottom plate 2, so that the magnetic flow passing through both bottom plates 2 and 5 is further increased. It is made to become.

The outer core member 3 shown in FIG. 12 (e) is provided with a plurality of protrusions 36 projecting upward on the upper surface of the first bottom plate 2 at intervals in the circumferential direction of the first bottom plate 2, and A plurality of downwardly projecting protrusions 37 are provided on the bottom surface of the second bottom plate 5 at a position shifted from the protrusions 36 in the circumferential direction of the second bottom plate 5, and the inner core member 6 is provided inside the outer core member 3. At the time of or after the press-fitting, both the protrusions 36 and 37 are pressurized and crushed, and the second bottom plate 5 extends outward by an amount corresponding to the crushed protrusion 37, and is outside the outer peripheral surface 5a of the second bottom plate 5. The close contact with the lower part 51 of the core member 3 is deepened, and the close contact between the second bottom plate 5 and the first bottom plate 2 is also increased by the degree that the two protrusions 36, 37 are crushed, so that the press-fitting of the both bottom plates 2, 5 is ensured. And the magnetic flow through both bottom plates 2 and 5 is further increased.

Instead of the protrusion 31 of the second bottom plate 5 in FIG. 12 (a), the protrusion 32 of the second bottom plate 5 in FIG. 12 (b), and the protrusion 34 of the first bottom plate 2 in FIG. 12 (c). A bead is provided in a ring shape in the circumferential direction of the second bottom plate 5, and when the inner core member 6 is press-fitted inside the outer core member 3 or after the press-fitting, the bead is pressed and crushed, and the protrusions 31, 32, The same effect as when 34 is crushed can be obtained. The upper part 50 of the outer peripheral wall 1 of the outer core member 3 may be made to expand rapidly outward from the force of the continuous part 53 (FIG. 9) with the lower part 51.

Outer core member 3 in Fig. 9 (c, d), outer core member 3 in Fig. 10 (c, d), inner core member 6 in Fig. 9 (a, b), outer core member in Fig. 10 (a, b) 6 can be manufactured as follows.

1. Production of outer core member 3. (1) Punch a metal plate for press to make a disk, and then punch a hole in the center of the disk. The punching of the disc and the drilling of the disc can also be performed simultaneously in a single press.

②. When manufacturing the outer core member 3 shown in Fig. 9 (c, d), the disk is pressed to form a substantially L-shaped cross section, the upper part 50 is open outward, and the lower part 51 is vertical. Alternatively, the cylindrical outer peripheral wall 1 and the first bottom plate 2, which are substantially vertical (the outer taper is expanded outward by the draft angle of the mold at the time of molding), and the first bottom plate 2 are integrally formed. In this case, use a press die such that the upper part 50 is opened outward. When assembling the inner core member 6 inside the outer core member 3 as shown in Fig. 9 (e), the dimensions of the first bottom plate 2 are as follows. It is sized to be pushed in without touching the inner peripheral surface 1a of the upper part 5 ().

When manufacturing the outer core member 3 shown in FIG. 10 (c, d), the disc is pressed to form a substantially L-shaped cross-section, the upper part 50 is open outward, and the lower part 51 force ^ An outer core member provided with a disk 22 inside the lower end of a cylindrical outer peripheral wall 1 which is vertical or almost vertical (spreads outward by the draft of the mold at the time of molding: inverted taper). Form 3. In this case, use a press die that opens the upper part out of 50 forces. The outer side of the disk 22 is the first bottom plate 2, the inner side thereof is the flange 10 for attaching to a compressor or the like, and the flange 10 is formed one step lower than the first bottom plate 2 so as to be lower than the first bottom plate 2. 2 1 is open. The flange 10 can be provided with screw holes or protrusions for fixing to the compressor. The dimensions of the first bottom plate 2 are such that when the inner core member 6 is assembled inside the outer core member 3 as shown in FIG. 9 (e), the outer peripheral edge 5 a of the second bottom plate 5 is located above the outer peripheral wall 1 of the outer core member 3. The size is such that it can be pushed in without touching the inner peripheral surface 1a of 50.

2. Production of inner core member 6.

①. Punch a metal plate for breath to make a disk, then punch out the center of the disk and make holes in the disk. The punching of this disc and the drilling of the disc It can be done simultaneously in the work.

②. When manufacturing the inner core member 6 shown in Fig. 9 (a, b), the above-mentioned disc is pressed to form the inner core member 6 having a substantially inverted L-shaped cross section and a ring shape. The inner core member 6 has a ring-shaped second bottom plate 5 integrally formed outside the lower end of the cylindrical inner peripheral wall 4. The dimensions of the second bottom plate 5 are such that when the inner core member 6 is pressed into the outer core member 3 as shown in FIG. 9 (e), the outer peripheral edge 5 a of the second bottom plate 5 The inner core member 6 is fixed to the inside of the outer core member 3 simply by press-fitting.

The inner core member 6 of FIG. 10 (a, b) is manufactured in the same manner as the inner core member 6 of FIG. 9 (a, b).

3. Manufacturing core 20 by assembling outer core member 3 and inner core member 6.

①. As shown in FIGS. 9 (e) and 10 (e), the inner core member 6 is press-fitted inside the outer core member 3 processed as described above, and The inner peripheral wall 4 of the inner core member 6 is opposed to the second bottom plate 5 of the inner core member 6 on the first bottom plate 2 of the outer core member 3 for assembly. In this case, the outer core member 3 and the inner core member 6 are fixed by the press-fitting, but if necessary, a friction welding method may be employed, or the first bottom plate 2 and the second bottom plate 5 may be spotted after the press-fitting. It can be fixed by any fixing means such as welding, projection welding, brazing, riveting, caulking or the like. By this assembling, a core 20 is obtained, and between the opposed outer peripheral wall 1, the inner peripheral wall 4, and the second bottom plate 5, a coil having a substantially U-shaped cross section capable of accommodating a donut-shaped electromagnetic coil 7 is accommodated. The part 8 is formed in a ring shape. Inside the inner peripheral wall 4 is formed a housing space portion 9 capable of housing other members, for example, the inner wall 1 la of the rotor 11 and the bearing 19 as shown in FIG.

②. The upper peripheral end face 1 c of the outer peripheral wall の of the outer core member 3 assembled as described above and the upper peripheral end face 4 b of the inner peripheral wall 4 of the inner core member 6 are cut, and both upper peripheral end faces 1 c, 4 Align b so that it is flush and horizontal. When the electromagnetic clutch core of the present invention is used, a donut-shaped electromagnetic coil 7 is housed in the coil housing portion 8. At this time, since the upper part of the coil housing part 8 is formed to open outward, the electromagnetic coil 7 can be easily housed in the coil housing part 8. The outer peripheral surface of the electromagnetic coil 7 accommodated in the coil accommodating portion 8 is defined by the outer peripheral wall 1 constituting the coil accommodating portion 8, the inner peripheral surface is defined by the inner peripheral wall 4 constituting the coil accommodating portion 8, and the bottom surface is defined by the coil accommodating portion 8. Each of them is covered by the second bottom plate 5 constituting the same. At this time, since the lower part 51 of the outer peripheral wall 1 is vertical or almost vertical, the outer peripheral surface of the electromagnetic coil 7 is held between the vertical part and the peripheral wall 4 to be displaced or inadvertently provided from the coil housing 8. It does not come off.

Next, insulating material is filled in the coil housing portion 8 in which the electromagnetic coil 7 is housed, and the electromagnetic coil 7 is fixed in the coil housing portion 8. Thereafter, if necessary, a ring-shaped lid (not shown) is placed over the opening of the coil housing 8 from above the electromagnetic coil 7 housed in the coil housing 8 to protect the electromagnetic coil 7. . A lead wire (not shown) of the electromagnetic coil 7 housed and fixed in the coil housing part 8 is drawn out of the coil housing part 8 from an outlet penetrating the first bottom plate 2 and the second bottom plate 5.

The core for an electromagnetic clutch described above is an example of a core used for a compressor of an air conditioner for an automobile, but the core for an electromagnetic clutch of the present invention may be used as a core for an electromagnetic clutch used in other industrial machines. it can. In some electromagnetic clutches, magnetic powder is disposed between the rotor 11 and the armature 13 shown in FIG. 5, but the electromagnetic clutch core of the present invention is also applicable to such an electromagnetic clutch. Can be used. Industrial applicability

Since the first core for an electromagnetic clutch of the present invention is formed by combining the outer core member 3 and the inner core member 6, the outer core member 3 and the inner core member 6 are formed by pressing a metal plate instead of cold forging. Can be formed by ordinary press working, The strike is also reduced.

In the second, fourth and sixth electromagnetic clutch cores of the present invention, not only the first bottom plate 2 but also the flange 10 are attached to the outer core member 3, so that the first bottom plate of the outer core member 3 is provided. There is no need to attach a separately formed flange 10 to the bottom of 2, so that there is no need to manufacture the core assembly.

In the third electromagnetic clutch core of the present invention, an inner insulating member 40 is provided outside the inner peripheral wall 4 of the inner core member 6, and an electromagnetic coil 7 is wound around the outer periphery of the inner insulating member 40. The outer side is covered with an outer insulating member 60, the outer core member 3 having an outer peripheral wall 1 is covered on the outer side thereof, and the first bottom plate 2 and the second bottom plate 5 are overlapped to form an outer peripheral wall 1 and an inner peripheral wall 4. Since the electromagnetic coil 7 is surrounded by the first bottom plate 2 and the second bottom plate 5 which are superimposed on each other, the electromagnetic coil 7 is separated from the inner core member 6 and the outer core member 3 in a conventional manner. It has good workability and can be manufactured at low cost.

The fifth electromagnetic clutch core of the present invention has a size such that the outer peripheral surface 5 a does not come into close contact with the inner peripheral surface 1 a of the upper part 50 of the outer peripheral wall 1 of the outer core member 3 when the second bottom plate 5 is pressed. Since the inner peripheral surface 1b of the lower portion 51 is sized to be in close contact with the outer peripheral surface 5a of the second bottom plate 5, the inner core member 6 is pressed into the outer peripheral wall 1 of the outer core member 3. At this time, the outer peripheral surface 5a of the second bottom plate 5 of the inner core member 6 does not contact the inner peripheral surface 1a of the upper part 50 of the outer peripheral wall 1 and smoothly enters the inner peripheral part of the lower part 51 of the outer peripheral wall 1. The inner core member 6 is easily press-fitted into only the surface 1b, and the inner core member 6 is easily pressed into the upper portion 50 of the outer peripheral wall 1 of the outer core member 3. Since the press-fitted inner core member 6 is securely held at the lower part 51 of the outer peripheral wall 1 of the outer core member 3, the inner core member 6 can be loosened inside the outer core member 3, It does not come off the core member 3. Further, since the upper part 50 of the outer peripheral wall 1 of the outer core member 3 is open outward, the electromagnetic coil 7 can be easily housed in the coil housing part 8. Furthermore, after press-fitting the inner core member 6 inside the outer peripheral wall 1 of the outer core member 3, the upper part 50 of the outer peripheral wall 1 of the outer core member 3 is caulked inward to further secure the inner core member 6 force. It can also be kept in The seventh electromagnetic clutch core of the present invention can be manufactured because each of the outer core member 3 and the inner core member 6 can be formed by normal press working of pressing a metal plate instead of cold forging. It is easier and lowers manufacturing costs.

In the eighth core for an electromagnetic clutch of the present invention, the inner core member 6 is press-fitted inside the outer core member 3, so that the assembling of both core members 3 and 6 is facilitated.

In the ninth electromagnetic clutch core of the present invention, the first bottom plate 2 of the superposed outer core member 3 and the second bottom plate 5 of the inner core member 6 are fixed by any means, so that the two bottom plates 2 and 5 are connected. And the magnetism passes through both bottom plates 2 and 5 easily.

The tenth electromagnetic clutch core of the present invention has a projection 30 formed on at least one of the first bottom plate 2 of the outer core member 3 and the second bottom plate 5 of the inner core member 6. The bottom of the electromagnetic clutch core can be easily made thicker, and a core with a large excitation force can be obtained because both or one of the two bottom plates 2 and 5 are formed by crushing When this core is used, the performance is good and an electromagnetic clutch can be obtained.

Claims

The scope of the claims

1.

A ring-shaped first bottom plate inside the cylindrical outer wall (1) (2) Inside the outer core member (3) provided on the car body, a tubular shape smaller than the outer wall (1) The inner core member (6), in which a ring-shaped second bottom plate (5) is integrally provided outside the inner peripheral wall (4), is connected to the outer peripheral wall (1) and the inner peripheral wall (4) and the first bottom plate. (2) Combined with the second bottom plate (5) so as to engage with the force type, and the first bottom plate (2) between its outer peripheral wall (1), inner peripheral wall (4) and both peripheral walls (1, 4) A groove-shaped coil housing part (8) capable of accommodating the electromagnetic coil (7) is formed between the inner peripheral wall (4) and the second bottom plate (5), so that other members can be accommodated inside the inner peripheral wall (4). A core for an electromagnetic clutch, wherein a space (9) is formed.

2.

A ring-shaped first bottom plate (2) is provided inside a cylindrical outer peripheral wall (1), and a flange (10) is provided inside the outer core member (3). The inner core member (6), in which a ring-shaped second bottom plate (5) is integrally provided on the outside of the cylindrical inner peripheral wall (4), which is smaller than (1), is attached to the outer peripheral wall (1) and the inner peripheral wall. (4) are opposed to each other, and the first bottom plate (2) and the second bottom plate (5) are combined so as to be overlapped with each other, and the outer peripheral wall (1), the outer peripheral wall (4), and both peripheral walls (1, 4) A groove-shaped coil housing ¾ ^ (8) for accommodating the electromagnetic coil (7) is formed between the first bottom plate (2) and the second bottom plate (5) between the first bottom plate (2) and the second bottom plate (5). A core for an electromagnetic clutch, characterized in that a housing space (9) is formed on the inside and capable of housing other members.

3.

An inner insulating member (40) is provided outside the inner peripheral wall (4) of the inner core member (6), in which a ring-shaped second bottom plate (5) is provided on the outside of the cylindrical inner peripheral wall (4). , This inside An electromagnetic coil (7) is wound around the outer periphery of the tool (40), the outside of the electromagnetic coil (7) is covered with an outer insulating member (60), and the inner core member (6) is covered with a cylindrical outer wall ( A ring-shaped first bottom plate (2) inward of 1); a first bottom plate (2) which is arranged inside the outer peripheral wall (1) of the outer core member (3) integrally projecting therefrom. The electromagnetic coil (7) is surrounded by the first bottom plate (2) and the second bottom plate (5) superposed on the outer peripheral wall (1) and the inner peripheral wall (4). A core for an electromagnetic clutch, characterized in that:

Four.

An inner insulating member (40) is provided outside the inner peripheral wall (4) of the inner core member (6), in which a ring-shaped second bottom plate (5) is provided on the outside of the cylindrical inner peripheral wall (4). An electromagnetic coil (7) is wound around the outer periphery of the inner insulator (40), the outer side of the electromagnetic coil (7) is covered with an outer insulator (50), and the inner core member (G) is formed into a cylindrical shape. The first bottom plate (2), the flange (10), and the outer core member (3) formed on the body are arranged inside the outer peripheral wall (1) inside the outer peripheral wall (1). The 1st bottom plate (2) and the 2nd bottom plate (5) are overlapped, and the electromagnetic coil is formed by the 1st bottom plate (2) and the 2nd bottom plate (5) that are superimposed on the outer peripheral wall (1) and the inner peripheral wall (4). (7) Electromagnetic clutch core, characterized by surrounding

Five.

A ring-shaped first bottom plate (2) is provided inside the lower part of the cylindrical outer peripheral wall (1). An outer core member (3) is provided inside the outer core member (3), and a ring-shaped outer part is provided outside the cylindrical inner peripheral wall (4). The inner core member (6) provided with the second bottom plate (5) is connected to the outer peripheral wall (1) and the inner peripheral wall (4) inside the first core plate (2) and the second bottom plate (5). A core for electromagnetic clutch which is press-fitted so as to overlap with the second bottom plate (5) when the inner peripheral surface (la) of the upper part (50) of the outer peripheral wall (1) is press-fitted with the inner core member (6). The outer peripheral surface (5a) of the outer peripheral wall (5a) is formed so as not to be in intimate contact with the inner core member (1). 6) An electromagnetic clutch core characterized in that it is formed in such a size that it comes into contact with the outer surface (5a) of force during press-fitting of (6).

6.

A first bottom plate (2) is provided inside the lower portion of the cylindrical outer peripheral wall (1) and a flange (10) is provided inside the first bottom plate (2). A cylindrical inner peripheral wall is provided inside the outer core member (3). (4) A ring-shaped second bottom plate (5) on the outer side of the cylindrical inner core member (6) provided with a force s is opposed to the outer peripheral wall (1) and the inner peripheral wall (4) inside thereof. And a core for an electromagnetic clutch in which the first bottom plate (2) and the second bottom plate (5) are press-fitted so as to overlap each other, and the inner peripheral surface (la) of the upper portion (50) of the outer peripheral wall (1) is (2) The outer peripheral surface (5a) of the second bottom plate (5) is formed so as not to contact tightly when the bottom plate (5) is press-fitted, and the inner peripheral surface (lb) of the lower part (5 1) of the outer peripheral wall U) An electromagnetic clutch core characterized in that the outer peripheral surface (5a) is formed in such a size that the outer peripheral surface (5a) is in close contact with the second bottom plate (5) when the second bottom plate (5) is press-fitted.

7.

The electromagnetic clutch core according to any one of claims 1 to 6, wherein each of the outer core member (3) and the inner core member (6) is formed by pressing a metal plate. A core for an electromagnetic clutch.

8.

The electromagnetic clutch according to any one of claims 1 to 4, wherein the inner core member (6) is press-fitted into the outer core member (3) and combined. For core.

9.

The electromagnetic clutch core according to any one of claims 1 to 6, wherein An electromagnetic clutch core, wherein a first bottom plate (2) of an outer core member (3) and a second bottom plate (5) of an inner core member (6) are fixed by any fixing means.

Ten.

7. The electromagnetic clutch core according to claim 1, wherein both the first bottom plate (2) of the outer core member (3) and the second bottom plate (5) of the inner core member (6) are provided. Alternatively, a convex portion (30) is formed on one side, and the convex portion [5 (30) is crushed to form one or both of the first bottom plate (2) and the second bottom plate (5) to be thick. Core for electromagnetic clutch.