JPH09303425A - Electromagnetic clutch core - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic clutch core, manufactured in a short time and at low cost, and manufacture of the clutch core. SOLUTION: An inner side insulating tool 40 is provided on the outer side of the inner circumferential wall 4 of an inside core member 6 wherein a ringlike second bottom plate 5 is integrally and protrudedly provided on the outer side of a cylindrical wall 4, and an electromagnetic coil 7 is wound on the outer periphery of the inner side insulating tool. The outer side of the coil 7 is coated with an outer side insulating tool, and an external core member, wherein a ringlike bottom plate 2 is integrally and protrudedly provided on the inner part of a cylindrical outer peripheral wall, is covered on the outer side of the core member 6 on which the coil 7 is provided, to overlap first and second bottom plates 2 and 5, thereby enclosing the coil 7 by the outer peripheral wall and the wall 4 and the first bottom plate and the second bottom plate 5 overlapped with each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core for an electromagnetic clutch used in automobiles, industrial machinery and the like.

[0002]

2. Description of the Related 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. 9 is a sectional view showing an example of an electromagnetic clutch used in a compressor of an automobile air conditioner. This electromagnetic clutch includes an electromagnetic coil 7 wound in a ring shape, a circular core 20 having a ring groove-shaped coil accommodating portion 8 for accommodating the electromagnetic coil 7, an outer peripheral surface of the core 20 and an opening of the coil accommodating portion 8. The rotor 11 has a shape that substantially covers the surface but is arranged so as not to contact the core 20, and a rotatable armature 13 arranged close to the friction surface 12 of the rotor 11. ing. 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 and brought into contact with the friction surface 12 of the rotor 11, so that the armature 13 together with the rotor 11 Rotate. When the power supply to the electromagnetic coil 7 is stopped, the excitation of the rotor 11 is released, and the armature 13 that has been attracted to the rotor 11 until then is separated from the rotor 11 by the retraction member 18, and the rotation of the armature 13 stops. That is, the rotation of the rotor 11 is intermittently transmitted to the armature 13 by turning ON / OFF the power supply to the electromagnetic coil 7.

In the electromagnetic clutch of FIG. 9 mounted on a compressor for an automobile air conditioner, a pulley 14 is mounted on the outer circumference of a rotor 11 so that the pulley 14 is rotated by a V belt 15 connected to an engine (not shown). On the other hand, the armature 13 is connected to the rotary shaft 17 of the compressor 16, and the rotary shaft 17 of the compressor 16 is driven when the amateur 13 is rotated. Amateur 13 in this case
Is a double plate of an inner armature 13a and an outer armature 13b arranged concentrically on the outer side of the inner armature 13a. When the rotor 11 sucks the inner armature 13a, the inner armature 13a is first sucked, and then the outer armature 13a is sucked. Amateur 1
3b is sucked so that the rotational force of the rotor 11 is not rapidly transmitted to the armature 13 side, whereby the impact on the transmission system and the compressor 16 is mitigated and they are not broken. The power supply to the electromagnetic coil 7 is turned on / off by a controller (not shown) of the air conditioner.
When the air conditioner is switched on while the engine is started and the rotor 11 is rotating, the current flows from the controller to the electromagnetic coil 7 and the rotating shaft 17 of the compressor 16 is driven. It Further, even when the air conditioner is operating, if the controller controls ON / OFF of the power supply to the electromagnetic coil 7 according to the temperature inside the vehicle, the rotating shaft 17 of the compressor 16 intermittently rotates and stops accordingly, and the air blown out into the vehicle. Is maintained at a predetermined temperature.

Core 20 used in the electromagnetic clutch of FIG.
Has been conventionally manufactured by the manufacturing process as shown in FIGS. 1. As shown in FIG. 11 (a), a thick ring-shaped steel plate 2
Prepare 1. The steel plate 21 is subjected to a bond process (bonderite process), so that workability in press working is enhanced. 2. The steel plate 21 is pressed by cold forging as shown in FIG.
1 (b), (c) ring-shaped coil housing portion 8
Then, a circular core 20 is formed in which a housing space 9 that can house other members (the inner wall 11a of the rotor 11 and the bearing 19 in FIG. 3) is formed. 3. Annealing the core 20 (annealing),
The residual strain left on the core 20 after pressing is reduced. 4. As shown in FIG. 11 (d), the open end surface 22 of the core 20 is cut and smoothed so that the core 11 comes into contact with the rotor 11 even if the distance between the open end surface 22 and the rotor 11 (FIG. 9) facing the core 20 is narrow. Try not to. Thus, the core 20 is completed. 5. Normally, the core 20 is adapted to be distributed in the state of the core assembly of FIG. 10 to which a mounting bracket (usually called a flange) 10 for mounting the core 20 on the compressor 16 is mounted. Therefore, in this case, a separately press-molded flange 10 is attached to the back side of the core 20 by welding as shown in FIGS. 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. Normally, in the core assembly, as shown in FIG. 11G, the electromagnetic coil 7 is set in the coil housing portion 8 of the core 20.

[0006]

In the method of manufacturing the core shown in FIG. 11, the circular steel plate 21 must be pressed once by cold forging to form the coil accommodating portion 8 having a substantially U-shaped cross section. In order to make the core 20, a deep-drawing press was required. However, for this purpose, a bonding process is required to perform deep narrowing, and large strain is accumulated and remains in the core 20 after performing the narrowing. Therefore, an annealing process (annealing process) for eliminating or reducing the distortion is performed. ) Was needed. For this reason, there is a problem that it takes a long time to manufacture the core 20 and the cost of the core 20 increases.

An object of the present invention is to provide an electromagnetic clutch core which can be manufactured in a short time and at low cost, and a manufacturing method thereof. Another object of the present invention is to provide an electromagnetic clutch core having a flange on the back surface of the core and a core manufacturing method capable of simultaneously forming the flange when manufacturing the core.

[0008]

As shown in FIG. 1, in the core for an electromagnetic clutch according to the first aspect of the present invention, a ring-shaped second bottom plate 5 is integrally projected on the outer side of a cylindrical inner peripheral wall 4. An inner insulating member 40 is provided on the outer side of the inner peripheral wall 4 of the inner core member 6 formed as shown in FIG. 2, and an electromagnetic coil 7 is provided on the outer periphery of the inner insulating member 40 as shown in FIG. The electromagnetic coil 7 is wound, and the outer side of the electromagnetic coil 7 is covered with an outer insulating member 50 as shown in FIG. 4, and the outer side of the inner core member 6 provided with the electromagnetic coil 7 has a cylindrical shape as shown in FIG. An outer core member 3 formed by integrally projecting a ring-shaped first bottom plate 2 inside the outer peripheral wall 1.
As shown in FIG. 5A, the first bottom plate 2 and the second bottom plate 5 are overlapped with each other, and the outer peripheral wall 1 and the inner peripheral wall 4 are overlapped with each other, and the first bottom plate 2 and the second bottom plate 5 are overlapped with each other. By electromagnetic coil 7
It surrounds.

In the core for an electromagnetic clutch according to claim 2 of the present invention, as shown in FIG. 1, an inner core formed by integrally projecting a ring-shaped second bottom plate 5 on the outside of a cylindrical inner peripheral wall 4. On the outer side of the inner peripheral wall 4 of the member 6, as shown in FIG.
3, the electromagnetic coil 7 is wound around the outer periphery of the inner insulating tool 40 as shown in FIG. 3A, and the outer side of the electromagnetic coil 7 is covered with the outer insulating tool 50 as shown in FIG. 6 (a) on the outside of the inner core member 6 provided with
As shown in FIG. 6B, the outer core member 3 in which the first bottom plate 2 and the flange 10 are integrally formed inside the cylindrical outer peripheral wall 1 is shown in FIG.
As shown in (c), the first bottom plate 2 and the second bottom plate 5 are overlapped with each other, and the outer peripheral wall 1 and the inner peripheral wall 4 are overlapped with each other by the first bottom plate 2 and the second bottom plate 5. It is a box.

The electromagnetic clutch core according to claim 3 of the present invention is the electromagnetic clutch core according to claim 1 or 2, wherein the inner insulating member 40 has an inner peripheral wall of the inner core member 6 as shown in FIG. 4, a peripheral wall insulating portion 41 arranged outside, a bottom plate insulating portion 42 arranged on the second bottom plate 5, and an upper plate insulating portion 43 provided above the bottom plate insulating portion 42 so as to face the outer wall insulating portion 41. As shown in FIG. 4, it can be arranged outside the outer circumference of the electromagnetic coil 7 wound outside the inner insulating member 40.

The electromagnetic clutch core according to claim 4 of the present invention is the electromagnetic clutch core according to claim 1 or 2, wherein the inner insulating member 40 has an inner peripheral wall of the inner core member 6 as shown in FIG. The peripheral wall insulating portion 41 and the second
And a bottom plate insulating portion 42 disposed on the bottom plate 5, and the outer insulating member 50 has an inner insulating member 4 as shown in FIGS.
It is provided with an outer peripheral insulating portion 51 arranged outside the electromagnetic coil 7 wound on the outside of 0 and an upper surface insulating portion 52 which covers the upper surface of the electromagnetic coil 7.

According to a fifth aspect of the present invention, there is provided an electromagnetic clutch core according to any one of the first to fourth aspects, wherein the outer core member 3 and the inner core member 6 shown in FIGS. Each is formed by pressing a metal plate.

According to a sixth aspect of the present invention, there is provided an electromagnetic clutch core according to any one of the first to fifth aspects, wherein the inner core is as shown in FIGS. 5 (a) and 6 (a). The member 6 is press-fitted inside the outer core member 3.

According to a seventh aspect of the present invention, the core for an electromagnetic clutch is the same as the core for an electromagnetic clutch according to the first to sixth aspects, as shown in FIGS. 5 (a) and 6 (a). In addition, the first bottom plate 2 of the outer core member 3 and the second bottom plate 5 of the inner core member 6 are fixed after being combined.

The electromagnetic clutch core according to claim 8 of the present invention is the same as the electromagnetic clutch core according to any one of claims 1 to 7, as shown in FIG. 8, the first bottom plate 2 and the inner bottom plate 2 of the outer core member 3. The protrusions 30 are formed on both or one of the second bottom plates 5 of the core member 6, and the protrusions 30 are crushed to form the bottom plates 2, 5
Both or one of them is formed into a thick wall.

[0016]

Embodiment 1 This embodiment is a first example of an electromagnetic clutch core used in a compressor of an air conditioner for automobiles. This comprises two parts, an outer core member 3 shown in FIGS. 5 (a) and 5 (b) and an inner core member 6 shown in FIGS. 1 (a) and 1 (b). As clearly shown in FIGS. 5A and 5B, the outer core member 3 has a ring-shaped first bottom plate 2 formed on the entire inner circumference of the lower end of the ring-shaped outer peripheral wall 1. The inner core member 6 is shown in FIG.
As shown in (b), the ring-shaped second inner peripheral wall 4 having a smaller diameter than the outer peripheral wall 1 has a ring-shaped second inner circumference 4 around the outer periphery of the lower end.
A bottom plate 5 is formed, and an accommodation space 9 that can accommodate other members is formed inside the inner peripheral wall 4.

The inner peripheral wall 4 of the inner core member 6 and the second bottom plate 5
As shown in FIG. 2 (b), an inner insulating member 40 is provided on the outer side of, and the electromagnetic coil 7 is wound around the outer periphery of the insulating material 40 as shown in FIG. 3 (a). In this case, as shown in FIG. 2 as the inner insulating member 40, a cylindrical peripheral wall insulating portion 41 arranged outside the inner peripheral wall 4 of the inner core member 6, and a ring-shaped bottom plate arranged on the second bottom plate 5. An insulating part 42 and a ring-shaped upper plate insulating part 43 provided above the insulating part 42 so as to be opposed to the insulating part 42 are integrally molded with resin, and the inner core member 6 is covered with the insulating part 42 and the inner peripheral wall 4 thereof. Peripheral wall insulation part 41 outside
And the bottom plate insulating part 42 is connected to the second bottom plate 5 of the inner core member 6.
The electromagnetic coil 7 is wound around the outer periphery of the peripheral wall insulating portion 41.

The outer insulating member 50 is arranged outside the outer circumference of the electromagnetic coil 7 wound around the inner insulating member 40. As shown in FIG. 4 (b), the outer insulating tool 50 is made of resin and is formed into a cylindrical shape.
4 so that the diameter can be expanded by manually opening it from the cutting portion 54 to the outside, and the expanded diameter is arranged outside the electromagnetic coil 7 as shown in FIG. After that, when the diameter expansion is released, the outer peripheral surface of the electromagnetic coil 7 is brought into close contact.

In this embodiment, after the outer insulating member 50 is arranged on the outer side of the electromagnetic coil 7 wound on the outer side of the inner core member 6, a ring is formed on the outer side of the inner core member 6 and on the inner side of the cylindrical outer peripheral wall 1. The outer core member 3 formed by integrally projecting the first bottom plate 2 having a circular shape, the first bottom plate 2 and the second bottom plate 5 are polymerized, and the outer peripheral wall 1 and the inner peripheral wall 4 are polymerized with each other. The electromagnetic coil 7 is surrounded by the first bottom plate 2 and the second bottom plate 5.

A flange (not shown) is attached under the first bottom plate 2 described above. A ring-shaped lid (not shown) is covered or press-fitted on the upper plate insulating portion 43 of the inner insulating tool 40 to protect the electromagnetic coil 7. Other members such as the inner wall 11a of the rotor 11 and the bearing 19 shown in FIG. 9 are housed in the housing space 9 inside the inner peripheral wall 4. A lead wire (not shown) of the electromagnetic coil 7 is led to the outside through a lead-out port that is opened by communicating with the first bottom plate 2 and the second bottom plate 5.

In the present invention, as shown in FIG. 3A, the electromagnetic coil 7
After winding, the space of the winding layer may be filled with an adhesive, a resin, or the like to solidify the electromagnetic coil 7, and then the outer insulating tool 50 may be arranged outside the electromagnetic coil 7. The filling of the adhesive, the resin, or the like can be performed after disposing the outer insulating member 50, or can be performed after covering the outer core member 3. In these cases, the filling is performed from the gap between the electromagnetic coil 7 and the outer insulating tool 50. If there is no gap, a hole for filling may be made in the outer insulating member 50, the outer core member 3 or the like, and the filling may be performed from there.

[0022]

Embodiment 2 The basic structure of this embodiment is the same as that of the embodiment shown in FIGS. 1 to 4, and the difference is the structure of the outer core member 3. As shown in FIG. 6, the outer core member 3 has a first bottom plate 2 formed inside a cylindrical outer peripheral wall 1, a flange 10 integrally formed inside thereof, and a through hole 21 formed in the center of the inside thereof. Is opened. Also in this embodiment, the outer core member 3 is covered on the outer side of the inner core material 6 to overlap the first bottom plate 2 and the second bottom plate 5, and the outer peripheral wall 1, the inner peripheral wall 4 and the first and second outer peripheral walls 1 and 4 are overlapped with each other. 1 bottom plate 2 and second bottom plate 5
The electromagnetic coil 7 is surrounded by. In this case, it is not necessary to attach the separate flange 10 under the first bottom plate 2.

As for 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, the first bottom plate 2 and the second bottom plate 5 are made thicker than the upper end side, and magnetic Although the magnetism generated from the coil 7 easily passes through the first bottom plate 2 and the second bottom plate 5, their thickness may be uniform. In any case, it is desirable that the total thickness of the first bottom plate 2 and the second bottom plate 5 be 5 mm or more from the viewpoint of magnetic passage. Further, since the inner core member 6 is press-fitted into the outer core member 3 in FIGS. 5A and 6C, the inner peripheral surface 1 a of the outer peripheral wall 1 of the outer core member 3 and the second bottom plate of the inner core member 6 are 5 has no gap between the outer peripheral surface 5a and the inner peripheral surface 1a and the outer peripheral surface 5a, even if there is a slight gap between the first bottom plate 2 of the outer core member 3 and the inner core member 6. Since it overlaps with the second bottom plate 5, there is no particular obstacle to the passage of magnetism.

[0024]

Third Embodiment As shown in FIGS. 7 (a) and 7 (b), the inner insulating member 40 of this embodiment has a ring-shaped bottom plate insulating portion 42 outside a lower portion of a cylindrical peripheral wall insulating portion 41. It is formed in a resin and is integrally molded. As shown in FIG. 7A, the inner insulating member 40 is placed on the outer side of the inner core member 6, and the peripheral wall insulating portion 41 is arranged on the outer side of the inner peripheral wall 4 of the inner core member 6, so that 2 bottom plate 5
A bottom plate insulating portion 42 is arranged on the top of the. In this embodiment, the electromagnetic coil 7 is wound around the outer peripheral wall insulating portion 41,
The outer side is covered with an outer insulating tool 50. As shown in FIGS. 7 (e) and 7 (f), the outer insulating member 50 is formed by integrally molding a peripheral insulating portion 51 arranged outside the electromagnetic coil 7 and an upper insulating portion 52 covering the upper surface of the electromagnetic coil 7 with resin. There is. Also in this embodiment, the ring-shaped first bottom plate 2 is integrally provided on the inside of the ring-shaped outer peripheral wall 1 outside the inner core member 6 to which the electromagnetic coil 7 is attached as described above. The outer core member 3 is covered so that the first bottom plate 2 and the second bottom plate 5 are overlapped with each other, and the outer peripheral wall 1, the inner peripheral wall 4, and the first bottom plate 2 and the second bottom plate 5 which are overlapped with each other are electromagnetically coupled. It surrounds the coil 7.

The inner insulating member 40 and the outer insulating member 50 may be made of materials other than resin, such as rubber, cloth, and leather, as long as they are insulating materials, and the shapes are not limited to those shown in the figures and other shapes. However, it may be, for example, an insulating tape or a glass fiber sheet. Further, it may be one in which an insulating material is applied thickly and cured.

[0026]

Fourth Embodiment of the Invention The outer core member 3 and the inner core member 6 in the present invention are molded, for example, as follows. 1. Production of outer core member 3. . A steel plate for stamping is punched to form a disk, and then a center portion of the disk is punched to make a hole. The punching of the disk and the perforation of the disk can be performed simultaneously by a single pressing operation. . As shown in FIG. 5, this disk is formed into a cylindrical shape having a substantially L-shaped cross section by a normal press working, and the raised cylindrical portion is the outer peripheral wall 1 and the lying portion is the first portion. It is used as the bottom plate 2.

2. Creation of the inner core member 6. . A stamped steel plate is punched to form a disc, and then the center of the disc is punched to make a hole in the disc. The punching of the disk and the perforation of the disk can be performed simultaneously by a single pressing operation. . By pressing this disc, an inner core member 6 having a substantially inverted L-shaped cross section and a ring shape is formed as shown in FIG. The inner core member 6 has a rising portion as an inner peripheral wall 4 and a lying portion as a second bottom plate 5. The dimensions of the second bottom plate 5 are the inner core member 6 and the outer core member 3
When assembling as shown in FIG. 5 (a), the outer peripheral edge 5a of the second bottom plate 5 is selected so as to be pressed (press fit) while being pressed against the inner peripheral surface 1a of the outer peripheral wall 1. The inner core member 6 is fixed inside the outer core member 3.

The outer core member 3 in the present invention can also be manufactured as follows. . A steel plate for stamping is punched to form a disk, and then a center portion of the disk is punched to make a hole. The punching of the disk and the perforation of the disk can be performed simultaneously by a single pressing operation. . This disc is subjected to ordinary press working as shown in FIG.
As shown in (b), the outer core member 3 including the disc 22 is formed inside the outer peripheral wall 1. The circular plate 22 has the outer peripheral portion as the first bottom plate 2 and the inner side thereof as the flange 10 for attaching to a compressor or the like. Flange 10 is first
It is formed one step lower than the bottom plate 2, and a through hole 21 is opened in the center. The flange 10 can be provided with a screw hole 10a and a protrusion 10b for fixing to the compressor.

In the third and fourth embodiments described above, the outer core member 3
The inner core member 6 is press-fitted inside the
The first bottom plate 2 and the second bottom plate 5 are spot-welded, brazed, riveted, caulked or otherwise fixed after the members 3 and 6 are loosely combined, instead of being press-fitted into the outer core member 3. It may be fixed by means.

In the core for the electromagnetic coil of the present invention, the first bottom plate 2 of the outer core member 3 and the second bottom plate 5 of the inner core member 6 which are overlapped with each other.
The larger the total thickness of and, the easier it is for the magnetism to pass. 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 as a press work, but as shown in FIG. 8, the first bottom plate of the outer core member 3 is used. 2, both or one of the second bottom plate 5 of the inner core member 6 is pressed and narrowed down to form the convex portion 30, and the convex portion 30 is crushed to make the first bottom plate 2 and the second bottom plate 5 thick. It may be molded into.

The electromagnetic clutch core described above is an example used for a compressor of an air conditioner for automobiles, but the electromagnetic clutch core of the present invention is an electromagnetic clutch core used in other industrial machines and It can also be used as a manufacturing method thereof. Although there is an electromagnetic clutch in which powder of a magnetic material is arranged between the rotor 11 and the armature 13 shown in FIG. 9, the electromagnetic clutch core of the present invention and the manufacturing method thereof are the same. Can also be used.

[0032]

The electromagnetic clutch core according to claim 1 is
The inner insulating member 40 is provided outside the inner peripheral wall 4 of the inner core member 6, and the electromagnetic coil 7 is wound around the outer periphery of the inner insulating member 40.
The outer side of the electromagnetic coil 7 is covered with the outer insulating tool 50, the outer core member 3 having the outer peripheral wall 1 is covered on the outer side of the electromagnetic coil 7, and the first bottom plate 2 and the second bottom plate 5 are polymerized to form the outer peripheral wall 1. Since the electromagnetic coil 7 is surrounded by the inner peripheral wall 4 and the first bottom plate 2 and the second bottom plate 5 which are overlapped with each other, the electromagnetic coil 7 is connected to the inner core member 6 and the outer core member 3 as in the conventional case. Has better workability and can be manufactured at a lower cost than the method using a separate volume.

The electromagnetic clutch core according to claim 2 has the following effects in addition to the same effects as those of claim 1. That is, not only the first bottom plate 2 but also the flange 10
Since the outer core member 3 and the inner core member 6 provided with the electromagnetic coil 7 are combined, the outer core member 3 and the first bottom plate 2 are separated from each other on the bottom of the first bottom plate 2. Since it is not necessary to mount the molded flange 10, workability is further improved as compared with the case of claim 1.

In the core for an electromagnetic clutch according to claim 3, the inner insulating member 40 has a peripheral wall insulating portion 41 arranged outside the inner peripheral wall 4 of the inner core member 6 and a bottom plate insulating portion arranged on the second bottom plate 5. 42 and the upper plate insulating portion 43, the electromagnetic coil 7 wound around the outer circumference of the inner insulating member 40 has the peripheral wall insulating portion 4
1, the bottom plate insulating portion 42 and the upper plate insulating portion 43 are surrounded from three sides, and the insulation is improved.

In the electromagnetic clutch core according to claim 4, the inner insulating member 40 has the peripheral wall insulating portion 41 arranged outside the inner peripheral wall 4 of the inner core member 6 and the bottom plate insulating portion 42 arranged on the second bottom plate 5. Since it is provided with, the electromagnetic coil 7 can be easily wound around the outer periphery of the peripheral wall insulating portion 41.

In the electromagnetic clutch core according to claim 5, the outer core member 3 and the inner core member 6 are not cold forged,
Since the metal plate can be formed by a normal pressing process, the manufacturing is facilitated and the manufacturing cost is reduced.

In the electromagnetic clutch core according to the sixth aspect, the inner core member 6 is press-fitted inside the outer core member 3, so that the core members 3 and 6 can be easily assembled. Further, since both members 3 and 6 can be press-fitted and temporarily fixed, subsequent welding, riveting, caulking, and brazing become easy.

In the electromagnetic clutch core according to the present invention, after the first bottom plate 2 of the outer core member 3 and the second bottom plate 5 of the inner core member 6 are combined, any fixing means such as welding or riveting is used. Since they are fixed, the connection between the two members 3 and 6 is reliable.

In the electromagnetic clutch core according to the eighth aspect, the convex portion 30 is formed on both or 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, and the convex portion 30 is formed. Since both bottom plates 2 and 5, or one of them, is crushed and formed into a thick wall, the bottom of the electromagnetic clutch core can be easily made thick, and a core having a large exciting force can be obtained. If this core is used, an electromagnetic clutch with good performance can be obtained.

[Brief description of drawings]

FIG. 1A is a perspective view showing an example of an inner core member used in a core for an electromagnetic clutch of the present invention, and FIG. 1B is a sectional view taken along line XX of FIG.

FIG. 2A is a perspective view showing an example of an inner insulator used in the core for an electromagnetic clutch of the present invention, and FIG. 2B is a state in which the inner insulator shown in FIG. 2A is arranged outside an inner core member. FIG.

FIG. 3 is a partial vertical cross-sectional view showing a state in which an electromagnetic coil is wound around the outer side of the inner insulator of the electromagnetic clutch core of the present invention.

FIG. 4 (a) is a partial vertical cross-sectional view showing a state in which an outer coil is wound around an inner coil of an electromagnetic clutch core of the present invention and then an outer coil is arranged, and FIG. 4 (b) is an example of an outer coil. FIG.

5A is a partial vertical cross-sectional view showing an example of an electromagnetic clutch core of the present invention, and FIG. 5B is a perspective view showing an example of an outer core member used for the electromagnetic clutch core.

6A is a perspective view showing another example of the outer core member in the core for an electromagnetic clutch of the present invention, FIG. 6B is a sectional view taken along line XX of the outer core member, and FIG. FIG. 3 is a partial vertical cross-sectional view showing an example of a clutch core.

7A is a partial cross-sectional view showing a state in which the inner insulating member of FIG. 7B is arranged outside the inner core member, and FIG. 7B is a perspective view showing another example of the inner insulating member. FIG. 3C is a partial cross-sectional view showing a state where an electromagnetic coil is wound around the outer side of the inner insulating tool of FIG. 7A, and FIG. 7D is a portion of the outer side of the electromagnetic coil covered with the outer insulating tool of FIG. Sectional drawing, (e) is a perspective view showing another example of the outer insulator, and (f) is a partial sectional view showing another example of the electromagnetic clutch core of the present invention.

8A to 8C are partial cross-sectional views showing a fifth example of the embodiment of the electromagnetic clutch core of the present invention.

FIG. 9 is a partial sectional view showing an example of a conventional electromagnetic clutch.

10A is a perspective view showing an example of a core in a conventional electromagnetic clutch, and FIG. 10B is a sectional view taken along line XX of the core.

11A to 11G are explanatory views showing a conventional core manufacturing method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 outer peripheral wall 2 1st bottom plate 3 outer core member 4 inner peripheral wall 5 2nd bottom plate 6 inner core member 7 electromagnetic coil 8 coil accommodation part 9 accommodation space part 10 flange 40 inner insulator 41 peripheral wall insulation part 42 bottom plate insulation part 43 upper plate Insulation part 50 Outside insulation tool 51 Perimeter insulation part 52 Top surface insulation part

Claims (8)

[Claims] 1. An inner core member (6), wherein a ring-shaped second bottom plate (5) is integrally projectingly provided on the outer side of a cylindrical inner peripheral wall (4).
An inner insulating member (40) is provided on the outer side of the inner peripheral wall (4), and an electromagnetic coil (7) is wound around the outer periphery of the inner insulating member (40).
0), the ring-shaped first bottom plate (2) integrally projects outside the inner core member (6) provided with the electromagnetic coil (7) and inside the cylindrical outer peripheral wall (1). A first bottom plate in which the outer core member (3) is covered and the first bottom plate (2) and the second bottom plate (5) are superposed, and the outer peripheral wall (1) and the inner peripheral wall (4) are superposed on each other. A core for an electromagnetic clutch, characterized in that the electromagnetic coil (7) is surrounded by (2) and the second bottom plate (5). 2. An inner core member (6), wherein a ring-shaped second bottom plate (5) is integrally projectingly provided on the outer side of a cylindrical inner peripheral wall (4).
An inner insulating member (40) is provided on the outer side of the inner peripheral wall (4), and an electromagnetic coil (7) is wound around the outer periphery of the inner insulating member (40).
0), the first bottom plate (2) and the flange (10) are provided outside the inner core member (6) provided with the electromagnetic coil (7) and inside the cylindrical outer peripheral wall (1). A first bottom plate (2) and a second bottom plate (5) are covered with an integrally formed outer core member (3).
An electromagnetic coil (7) surrounded by a first bottom plate (2) and a second bottom plate (5) which are superposed on each other and are superposed on the outer peripheral wall (1) and the inner peripheral wall (4). Clutch core. 3. The core for an electromagnetic clutch according to claim 1 or 2, wherein the inner insulating member (40) is arranged outside the inner peripheral wall (4) of the inner core member (6). ) And a bottom plate insulating part (42) arranged on the second bottom plate (5) and an upper plate insulating part (43) provided above the bottom plate insulating part (42) so as to be opposed to the bottom plate insulating part (42), and the outer insulator (50) is insulated inside. A core for an electromagnetic clutch, which can be arranged outside the outer circumference of an electromagnetic coil (7) wound on the outside of a tool (40). 4. The core for an electromagnetic clutch according to claim 1 or 2, wherein the inner insulating member (40) is arranged outside the inner peripheral wall (4) of the inner core member (6).
1) and the bottom plate insulating part (4) arranged on the second bottom plate (5)
2) and the outer insulation (50) is the inner insulation (4).
0) is provided with an outer periphery insulating portion (51) arranged outside the outer periphery of the electromagnetic coil (7) and an upper surface insulating portion (52) covering the upper surface of the electromagnetic coil (7). A core for an electromagnetic clutch, which is characterized by that. 5. The core for an electromagnetic clutch according to claim 1, wherein the outer core member (3) and the inner core member (6).
Each of the above is a core for an electromagnetic clutch, which is formed by pressing a metal plate. 6. The core for an electromagnetic clutch according to claim 1, wherein the inner core member (6) is an outer core member (3).
A core for an electromagnetic clutch, which is press-fitted inside the core. 7. The core for an electromagnetic clutch according to claim 1, wherein the first bottom plate (2) of the outer core member (3) and the second bottom plate (5) of the inner core member (6) are polymerized. An electromagnetic clutch core, characterized in that and are fixed after combination. 8. The core for an electromagnetic clutch 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) or For an electromagnetic clutch, characterized in that a convex portion (30) is formed on one side, and the convex portion (30) is crushed to mold both bottom plates (2), (5) or both to a thick wall. core.