JPH10311351A - Core for electromagnetic clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate press fitting of an inner core member to the inside in an upper part of a peripheral wall of an outer core member. SOLUTION: An internal diameter of an upper part 50 in a peripheral wall 1 of an outer core member 3 is formed in a size preventing a peripheral surface 5a of a second bottom plate 5 from coming into close contact when the second bottom plate 5 of an inner core member 6 is press fitted, and an internal diameter of a lower part 51 in a peripheral wall 1 is formed in a size bringing the peripheral wall 5a of the second bottom plate 5 into close contact when it is press fitted. Each of the outer/inner core members 3, 6 is molded by press work of a metal plate. A first bottom plate 2 of the outer core member 3 and the second bottom plate 5 of the inner core member 6 superposed in each other to be press fitted are fixed by the other fixing means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic clutch core used for 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.

A conventional electromagnetic clutch used for a compressor of an air conditioner for a vehicle includes an electromagnetic coil 7 wound in a ring shape as shown in FIG. 8 and a ring groove-shaped coil accommodating portion 8 (FIG. 8) for accommodating the coil. 7, 8), and the core 20 is arranged so as to substantially cover the outer peripheral surface of the core 20 and the opening surface of the coil accommodating portion 8 but not to contact the core 20. Rotatable rotor 11 (Fig. 8)
And a rotatable armature 13 (FIG. 8) arranged close to the friction surface 12 of the rotor 11. In this electromagnetic clutch, the electromagnetic coil 7 is rotated while the rotor 11 is rotating.
When the current is supplied to the rotor 11, the rotor 11 is excited, and the armature 13 near the rotor 11 is attracted to and comes into contact with the friction surface 12 of the rotor 11, and the armature 13 rotates together with the rotor 11.
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 electromagnetic coil 7
The rotation of the rotor 11 is intermittently transmitted to the amateur 13 by turning ON / OFF the power supply to the motor 13.

In the electromagnetic clutch shown in FIG. 8, a pulley 14 is attached to the outer periphery of a rotor 11, and the pulley 14 is rotated by a V-belt 15 connected to an engine (not shown). The amateur 13 is connected to the rotating shaft 17 of the compressor 16 and the amateur 1
When the rotary shaft 3 is rotated, the rotary shaft 17 of the compressor 16 is driven. Power is supplied to the electromagnetic coil 7 by a controller (not shown) of the air conditioner.
When the air conditioner is turned on in a state where the engine is started and the rotor 11 is rotating, a current flows from the controller to the electromagnetic coil 7 and the rotating shaft 17 of the compressor 16 is turned on / off. Driven.
Further, even when the controller controls ON / OFF of the power supply to the electromagnetic coil 7 in accordance with the temperature inside the vehicle, the rotary shaft 17 of the compressor 16 intermittently rotates and stops in response to the air blown into the vehicle. Is maintained at a predetermined temperature.

A core 20 used in the electromagnetic clutch shown in FIG.
Conventionally, was manufactured by a manufacturing process as shown in FIGS. 9 (a) to 9 (g). 1. As shown in FIG. 9A, a thick ring-shaped steel plate 21 is formed.
Prepare 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.
(B), ring-shaped coil accommodating portion 8 as in (c)
Then, a circular core 20 in which the accommodation space 9 capable of accommodating other members (the inner wall 11a of the rotor 11 in FIG. 7, the bearing 19, etc.) 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. 9D, the opening end face 22 of the core 20 is cut and smoothed, and even if the space between the rotor 20 and the rotor 11 (FIG. 8) arranged opposite to the core 20 is small, the rotor 11 is in contact. Don't do it. Thus, the core 20 is completed. 5. Normally, the core 20 is adapted to flow in the core assembly of FIG. 7 with a mounting fitting (commonly referred to as a flange) 10 for mounting the core to the compressor 16. Therefore, in this case, as shown in FIGS. 9E and 9F, a flange 10 separately press-formed by cold forging is attached to the back side of the core 20 by welding. 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, as shown in FIG. 9 (g), the electromagnetic coil 7 is set in the coil accommodating portion 8 of the core 20 in the core assembly.

In the core manufacturing method shown in FIG. 9, since the circular steel plate 21 must be formed by a single cold forging press to form the coil accommodating portion 8 having a substantially U-shaped cross section, the core 2
The production of No. 0 required a deep drawing press. 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.

In order to solve such a problem, the present applicant has previously developed an electromagnetic clutch core as shown in FIG. 6 and filed a patent application (Japanese Patent Application No. 7-270455). As shown in FIGS. 6 (c) and 6 (d), this core is provided inside the outer peripheral wall 1 of the outer core member 3 in which the ring-shaped first bottom plate 2 is integrally protruded inside the ring-shaped outer peripheral wall 1. 6 (a) and 6 (b)
As shown in FIG. 6 (e), the inner core member 6 in which the ring-shaped second bottom plate 5 is integrally protruded outside the ring-shaped inner peripheral wall 4 is shown in FIG.
And the outer peripheral wall 1 and the inner peripheral wall 4 are combined so that the outer peripheral wall 1 and the inner peripheral wall 4 face each other and the first bottom plate 2 and the second bottom plate 5 are overlapped. Ring-shaped coil housing 8 surrounded by the first bottom plate 2 and the second bottom plate 5
And a space for accommodating the electromagnetic coil 7 in the coil accommodating portion 8 and for accommodating other members, for example, the inner wall 11a of the rotor 11 and the bearing 19 as shown in FIG. The part 9 is formed.

[0008]

In this electromagnetic clutch core, the upper part of the cylindrical outer peripheral wall 1 of the outer core member 3 expands outward (reverse taper) by the draft angle at the time of molding. Since the outside spread is only small enough to allow the mold at the time of molding to escape, the inner peripheral surface of the outer peripheral wall 1 is almost vertical (straight) from top to bottom. Therefore, when the inner core member 6 is press-fitted inside the outer peripheral wall 1 of the outer core member 3, the outer peripheral surface 5 a of the ring-shaped second bottom plate 5 of the inner core member 6 is fixed to the inner peripheral surface of the outer peripheral wall 1 of the outer core member 3. The surface 1d comes into close contact from top to bottom. For this reason, there is a problem that the distance of close contact at the time of press-fitting becomes long, and it is difficult to press-fit the inner core member 6.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide an electromagnetic clutch core which can be easily press-fitted.

A first electromagnetic clutch core of the present invention is shown in FIG.
(C) As shown in FIGS. 1 (a) and 1 (b), inside the outer core member 3 in which the ring-shaped first bottom plate 2 is provided inside the bottom of the cylindrical outer peripheral wall 1 as shown in FIG. The inner core member 6 provided with the ring-shaped second bottom plate 5 on the outer side of the bottom of the inner wall 4 having the shape of FIG.
(E) an electromagnetic clutch core formed by press-fitting the outer peripheral wall 1 and the inner peripheral wall 4 inside thereof so as to face each other and the first bottom plate 2 and the second bottom plate 5 to overlap with each other; The inner peripheral surface 1a of the upper portion 50 of the wall 1 is pressed when the second bottom plate 5 is press-fitted.
And the inner peripheral surface 1b of the lower portion 51 of the outer peripheral wall 1 is formed in such a size that the outer peripheral surface 5a is in close contact when the second bottom plate 5 is press-fitted. It becomes.

FIG. 2 shows a second electromagnetic clutch core according to the present invention.
As shown in FIGS. 2C and 2D, a first bottom plate 2 is provided inside a cylindrical outer peripheral wall 1 and a flange 10 is provided inside the first bottom plate 2. As shown in FIG. 2B, the cylindrical inner core member 6 having the ring-shaped second bottom plate 5 provided outside the cylindrical inner peripheral wall 4 is connected to the outer peripheral wall 1 and the inner wall thereof as shown in FIG. The inner peripheral wall 4 is an electromagnetic clutch core formed by press-fitting the first bottom plate 2 and the second bottom plate 5 so that the first bottom plate 2 and the second bottom plate 5 are overlapped with each other.
The outer peripheral surface 5a of the second bottom plate 5 is formed in such a size that the outer peripheral surface 5a does not come into close contact with the bottom plate 5 when the bottom plate 5 is press-fitted. It is formed in such a size that it can be pressed into contact with the substrate.

A third electromagnetic clutch core according to the present invention comprises an outer core member 3 and an inner core member 6 of the electromagnetic clutch core.
Is formed by pressing a metal plate.

A fourth electromagnetic clutch core according to the present invention is characterized in that, in the electromagnetic clutch core, 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 press-fitted and overlapped are arbitrarily set. Is fixed by the fixing means.

[0014]

Embodiment 1 A core for an electromagnetic clutch according to this embodiment is used for a compressor of an air conditioner for an automobile, and the inner core member 6 shown in FIGS. c) It is assembled by press-fitting the inside of the outer core member 3 of (d) as shown in FIG. 1 (e). The inner core member 6 is formed with a cylindrical inner peripheral wall 4 having an outer diameter smaller than that of the cylindrical outer peripheral wall 1 of the outer core member 3, and the inner peripheral wall 4 is drafted so as to taper inward. A ring-shaped second bottom plate 5 is formed 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 all around the lower end of the outer peripheral wall 1 (FIGS. 1c and 1d).
The outer peripheral wall 1 gradually turns the upper part 50 upward, as shown in FIG.
Of the inner peripheral surface 1a of the upper part 50 so that the outer peripheral surface 5a of the inner peripheral surface 1a of the upper part 50 is pressed into the inner peripheral surface 1a when the second bottom plate 5 is press-fitted. The size is not close. The lower portion 51 of the outer peripheral wall 1 is perpendicular or substantially vertical in the longitudinal direction (a tapered shape that is slightly tapered upward and expands outward toward the outside) to form an inner peripheral surface 1b of the lower portion 51. Of the second bottom plate 5 is press-fitted so that its outer peripheral surface 5a is in close contact with the inner peripheral surface 1a. By adopting such a structure, FIG.
When the inner core member 6 is pressed into the outer peripheral wall 1 of the outer core member 3 as shown in (e), the outer peripheral surface 5a of the second bottom plate 5 is partially extended to the inner peripheral surface 1a of the upper portion 50 of the outer peripheral wall 1. The outer peripheral surface 5a of the second bottom plate 5 comes into close contact with the inner peripheral surface 1b and is press-fitted and fixed when approaching the lower portion 51 of the outer peripheral wall 1 without being in close contact with the outer peripheral wall 1. . If the depth L (FIG. 1f) of the lower portion 51, which is vertical or almost vertical, is set to 1 to 1.5 times the thickness of the second bottom plate 5, the second bottom plate 5 can be easily press-fitted and securely fixed. , It may be deeper or shallower. The outer peripheral wall 1 is fixed by press-fitting the second bottom plate 5.
And the inner peripheral wall 4 inside the first bottom plate 2, the second bottom plate 5 is superimposed on the inside (upper) of the first bottom plate 2, and the outer peripheral wall 1, the inner peripheral wall 4, the first bottom plate 2 and the second A coil housing portion 8 surrounded by the two bottom plates 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 around the entire outer peripheral wall 1 and the inner peripheral wall 4 so as to accommodate the donut-shaped electromagnetic coil 7. is there. As shown in FIG. 1 (e), a housing space 9 is formed inside the inner peripheral wall 4, and other members such as the inner wall 11a of the rotor 11 and the bearing 1 shown in FIG.
9 can be accommodated.

[0016]

Embodiment 2 An electromagnetic clutch core according to this embodiment is similar to that of the inner core member 6 shown in FIGS.
2C and 2D are assembled by press-fitting the inside of the outer core member 3 as shown in FIG. FIGS. 2A and 2B
The inner core member 6 has the same shape as the inner core member 6 shown in FIGS.

In the outer core member 3 shown in FIGS. 2C and 2D, a disk 22 is formed integrally with the entire outer periphery of the lower end of the outer peripheral wall 1. The disk 22 has the flange 10 formed integrally with the inside of the first bottom plate 2, and the through hole 21 is opened at the center of the flange 10. The outer peripheral wall 1 is formed so that the upper part 50 is gradually widened outward with the upper part facing upward, and the inner peripheral surface 1 a of the upper part 50 is formed such that the outer peripheral surface 5 a is pressed when the second bottom plate 5 is press-fitted.
The lower portion 51 of the outer peripheral wall 1 is made vertical or almost vertical in the vertical direction (a reverse taper slightly expanding outward by the draft angle of the mold). The inner diameter of the inner peripheral surface 1b of the lower portion 51 is set to a size such 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. By adopting such a structure, FIG.
When the inner core member 6 is press-fitted inside the outer peripheral wall 1 of the outer core member 3, the outer peripheral surface 5a of the second bottom plate 5 is partially connected to the inner peripheral surface 1a of the upper portion 50 of the outer peripheral member 1 as shown in FIG. When the second bottom plate 5 is pressed smoothly without being in close contact with the lower wall 51 of the outer peripheral wall 1, the outer peripheral surface 5a of the second bottom plate 5 comes into close contact with the inner peripheral surface 1b and is 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, and the second bottom plate 5 is superimposed on the inside (upper) of the first bottom plate 2,
A coil accommodating portion 8 is formed which is surrounded by the outer peripheral wall 1, the inner peripheral wall 4, and the first bottom plate 2 and the second bottom plate 5 that are overlapped. 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 so as to accommodate the donut-shaped electromagnetic coil 7. is there. Further, as shown in FIG. 2E, a housing space 9 is formed inside the inner peripheral wall 4, and other members such as the inner wall 11a of the rotor 11 shown in FIG. It is like that.

[0018]

Embodiment 3 A cylindrical outer peripheral wall 1 of an outer core member 3 shown in FIGS. 1 and 2C and 2D, and FIGS. 1 and 2A.
The thickness of the cylindrical inner peripheral wall 4 of the inner core member 6 shown in (b) is uniform from the bottom to the top, and is uniform over the entire circumference. In order to make it easier to pass through the inside of the first bottom plate 2 and the second bottom plate 5, the outer peripheral wall 1 and the inner peripheral wall 4
Instead, the first bottom plate 2 and the second bottom plate 5 may be made thicker. 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. In order to increase the thickness of the first bottom plate 2 and the second bottom plate 5, a thick metal plate may be used as a metal plate to be pressed. Each of the first bottom plate 2 (FIGS. 3b and 3c) and the second bottom plate 5 (FIG. 3a) of the inner core member 6 is pressed and squeezed to form a convex portion 30 projecting upward.
The first bottom plate 2 and the second bottom plate 5 are formed by crushing 0 by pressing. In this case, it is preferable from the work viewpoint that the pressing of the convex portion 30 is performed before the inner core member 6 is pressed into the inside of the outer core member 3, for example. The convex portion 30 is formed between the first bottom plate 2 of the outer core member 3 and the second bottom plate 5 of the inner core member 6.
It may be formed on any one of them.

[0019]

Fourth Embodiment FIG. 4A and FIG. 4B show an inner core member 6, which is a projection 31 projecting upward from the upper surface of a second bottom plate 5 as shown in FIG. As shown in FIG. 4 (b), a plurality of the inner core members 6 are press-fitted into the outer core member 3 at intervals in the circumferential direction of the second bottom plate 5, and before or after the press-fitting or after the press-fitting. The second bottom plate 5 extends outward (to the left in FIG. 4A: the inner peripheral surface 1b side of the lower portion 51 of the outer core member 3) by the amount of the crushing of the projection 31.
Of the outer peripheral surface 5a and the inner peripheral surface 1b of the lower portion 51 of the outer core member 3 is deepened, the press-fitting of the bottom plates 2, 5 is ensured, and the magnetic flow through the bottom plates 2, 5 is further increased. It is made to become.

[0020]

Fifth Embodiment FIG. 5A shows an inner core member 6 having a plurality of projections 31 projecting downward on the bottom surface of the second bottom plate 5 at intervals in the circumferential direction. The inner core member 6 is press-fitted inside the outer core member 3, and the second bottom plate 5 is pressurized at the time of press-fitting or after the press-fitting to crush the protruding parts 31. 5 is outside (FIG. 5a)
Left side: the inner peripheral surface 1b side of the lower part 51 of the outer core member 3), and the outer peripheral surface 5a of the second bottom plate 5 and the lower part 5 of the outer core member 3
1 and the inner peripheral surface 1b, and the second bottom plate 5 and the first bottom plate 2 are also closely adhered to each other, so that both the bottom plates 2 and 5 are securely press-fitted and pass through both the bottom plates 2 and 5. This is to make the magnetic flow more dense.

[0021]

Sixth Embodiment FIG. 5B shows an inner core member 6, which has two rows of projections 32 projecting downward on the bottom surface of the second bottom plate 5 and is circumferentially spaced. The inner core member 6 is press-fitted into the inner side of the outer core member 3 on the side, and the second bottom plate 5 is pressed at the time of or after press-fitting to crush the rows of the protruding members 32, Second as much as child 32 was crushed
The bottom plate 5 is located on the outside (left side in FIG. 5B: the lower portion 51 of the outer core member 3).
Of the second bottom plate 5 and the inner peripheral surface 1b of the lower part 51 of the outer core member 3, and the close contact between the second bottom plate 5 and the first bottom plate 2 is increased. And the press-fitting of the two bottom plates 2 and 5 is ensured.
The flow of the magnetic field passing through is further increased.

[0022]

Embodiment 7 FIG. 5 (c) also shows an inner core member 6, which is provided with a plurality of arc-shaped depressions 33 at the bottom surface of the second bottom plate 5 at intervals in the circumferential direction. On the upper surface of the first bottom plate 2 of the outer core member 3, a plurality of protrusions 34 projecting upward are provided at intervals in the circumferential direction of the first bottom plate 2, and the inner core member 6 of the outer core member 3 is provided on this side. When press-fitting the inside, the protrusion 34 is aligned with the recess 33 and the two are closely fitted to each other, and the electromagnetic force flows through both the bottom plates 2 and 5 by deepening the close contact between the second bottom plate 5 and the first bottom plate 2. Is made more dense.

[0023]

Eighth Embodiment FIG. 5D shows an outer core member 3, which is formed by forming a bead 35 projecting upward on the upper surface of the first bottom plate 2 in a ring shape in the circumferential direction of the first bottom plate 2. Provided in
When the inner core member 6 is pressed into the inner side of the outer core member 3 on this side, the beads 35 are pressed and crushed to deepen the close contact between the second bottom plate 5 and the first bottom plate 2. The flow of the electromagnetic field passing through is further increased.

[0024]

Ninth Embodiment FIG. 5 (e) shows a projection 36 projecting upward from the upper surface of the first bottom plate 2 of the outer core member 3.
Are provided at intervals in the circumferential direction of the first bottom plate 2, and the second
The protrusion 37 protruding downward from the bottom surface of the bottom plate 5 is
The inner core member 6 is press-fitted inside the outer core member 3 at the time of or after the press-fitting, and the two protrusions 36, 37 are added. The second bottom plate 5 extends outward by an amount corresponding to the crushing of the projections 37, and the outer peripheral surface 5a of the second bottom plate 5 and the lower portion 5 of the outer core member 3 are compressed.
1 and the contact between the second bottom plate 5 and the first bottom plate 2 is increased by the amount of the crushing of the two projections 36 and 37, so that the press-fitting of the both bottom plates 2 and 5 is ensured and the both bottom plates are fixed. 2,5
The flow of the magnetic field passing through is further increased.

[0025]

Embodiment 10 A protrusion 31 of the second bottom plate 5 in FIG. 5A, a protrusion 32 of the second bottom plate 5 in FIG.
(C) The bead is replaced with the bead instead of the protrusion 34 of the first bottom plate 2.
When the inner core member 6 is provided inside the outer core member 3 by press-fitting or after the press-fitting, the beads are crushed by pressing the beads 31, 32, 34 when the inner core member 6 is provided in a ring shape in the circumferential direction of the bottom plate 5. The same effect as described above can be obtained. The upper portion 50 of the outer peripheral wall 1 of the outer core member 3 may be made to rapidly expand outward from a continuous portion 53 (FIG. 1) with the lower portion 51.

The electromagnetic clutch core (core shown in FIG. 1e) according to the first embodiment can be manufactured 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. . By pressing this disk, the cross-sectional shape as shown in FIGS. 1 (c) and 1 (d) is substantially L-shaped, the upper part 50 is open outward, and the lower part 51 is vertical or almost vertical (removal of the mold at the time of molding). An outer core member 3 is formed in which the cylindrical outer peripheral wall 1 and the first bottom plate 2 are integrally formed with the outer peripheral wall 1 and the first bottom plate 2 are formed so as to expand outward by an amount corresponding to the gradient. In this case, a press die in which the upper part 50 is opened outward is used. When the inner core member 6 is assembled inside the outer core member 3 as shown in FIG. 1 (e), the outer peripheral edge 5a of the second bottom plate 5 is set to the upper portion 50 of the outer peripheral wall 1 of the outer core member 3. The size is such that it can be pushed in without contacting the inner peripheral surface 1a of the rim.

2. Production of inner core member 6. . A stamped steel plate is punched to form a disk, and then the center of the disk is punched to make holes 22 (FIGS. 1a and 1b) in the disk. The punching of the disk and the perforation of the disk can be performed simultaneously by a single pressing operation. . By pressing this disc, press processing is performed as shown in FIGS. 1 (a) and 1 (b).
As shown in (1), an inner core member 6 having a substantially inverted L-shaped cross section and a ring shape is formed. 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 the same as those of the inner core member 6 shown in FIG.
When press-fitting inside the outer core member 3 as in (e),
The outer peripheral edge 5a of the second bottom plate 5 is sized to be pressed into the inner peripheral surface 1b of the lower portion 51 of the outer peripheral wall 1, and only press-fitting is performed as shown in FIG.
As shown in (e), the inner core member 6 is fixed inside the outer core member 3.

3. Production of the core 20 by assembling the outer core member 3 and the inner core member 6. . FIG. 1 shows the inside of the outer core member 3 processed as described above.
(E), the inner core member 6 is press-fitted so that the outer peripheral wall 1 of the outer core member 3 and the inner peripheral wall 2 of the inner core member 6 face each other,
The second bottom plate 5 of the inner core member 6 is replaced with the first bottom plate 2 of the outer core member 3.
And assemble them. In this case, the outer core member 3 and the inner core member 6 are fixed by the press-fitting. However, if necessary, a friction welding method may be employed, or the first bottom plate 2 and the second bottom plate 5 may be spot-welded after the press-fitting. , Projection welding, brazing, riveting, caulking or the like. By this assembling, the core 20 is obtained, and the opposing outer peripheral wall 1, the inner peripheral wall 2, and the second
A coil housing portion 8 having a substantially U-shaped cross section capable of housing the donut-shaped electromagnetic coil 7 is formed between the bottom plate 5 and the ring-shaped coil housing portion 8. Further, other members such as the inner wall 11a of the rotor 11 and the bearing 1 as shown in FIG.
An accommodation space 9 capable of accommodating 9 and the like is formed. . The upper peripheral end face 1c of the outer peripheral wall 1 of the outer core member 3 and the upper peripheral end face 4b of the inner peripheral wall 4 of the inner core member 6 assembled as described above are cut so that the upper peripheral end faces 1c and 4b are flush. And align them horizontally.

The electromagnetic clutch core (the core shown in FIG. 2E) of the second embodiment can be manufactured 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 form a hole 21 (21 in FIG. 2). The punching of this disc and the opening of the hole 21 in the disc are 1
It can be performed simultaneously by two pressing operations. . As shown in FIGS. 2 (c) and 2 (d), this disc is press-worked so that the upper part 50 is open outward and the lower part 51 is vertical or almost vertical (outwardly spreading by the draft angle of the mold during molding: An outer core member 3 having a disk 22 is formed inside a lower end of a cylindrical outer peripheral wall 1 having a reverse taper.
In this case, a press die in which the upper part 50 is opened outward is used. The outer side of the disk 22 is the first bottom plate 2 and the inner side thereof is a flange 10 for attaching to a compressor or the like.
The flange 10 is formed to be lower than the first bottom plate 2 by one step, and a through hole 21 is opened at the center. Flange 10
Can be provided with screw holes and 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.
The outer peripheral edge 5a of the second bottom plate 5 is sized so as to be pushed in without contacting the inner peripheral surface 1a of the upper portion 50 of the outer peripheral wall 1 of the outer core member 3.

2. Production of 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. . This disc is pressed to form an inner core member 6 having a substantially inverted L-shaped cross section and a ring shape as shown in FIGS. 2 (a) and 2 (b). The inner core member 6 has a raised portion as a cylindrical inner peripheral wall 4 and a lying portion as a second bottom plate 5. The dimensions of the second bottom plate 5 are such that when the inner core member 6 is assembled inside the outer core member 3 as shown in FIG.
The outer peripheral edge 5a of the second bottom plate 5 is selected so as to be pressed into the inner peripheral surface 1b of the lower portion 51 of the outer peripheral wall 1, and only the press-fitting is performed as shown in FIG.
As shown in (e), the inner core member 6 is fixed inside the outer core member 3.

3. Production of the core 20 by assembling the outer core member 3 and the inner core member 6. . As shown in FIG. 2E, the inner core member 6 is press-fitted inside the cylindrical outer peripheral wall 1 of the outer core member 3 formed as described above, and the inner core member 6 is inserted inside the outer peripheral wall 1. The second bottom plate 5 of the inner core member 6 is assembled on the first bottom plate 2 of the outer core member 3 with the cylindrical inner peripheral walls 2 facing each other. in this case,
The outer core member 3 and the inner core member 6 are fixed by the press-fitting. However, if necessary, a friction welding method may be employed, or after the press-fitting, the first bottom plate 2 and the second bottom plate 5 may be spot-welded and projection-welded. , Brazing, riveting, caulking or the like. By this assembling, a core 20 (FIG. 2e) is obtained, and the upper part capable of accommodating the donut-shaped electromagnetic coil 7 between the opposing outer peripheral wall 1, inner peripheral wall 2, and second bottom plate 5 is open outward and has a sectional shape. About U
The letter-shaped coil housing portion 8 is formed in a ring shape. Also,
Inside the inner peripheral wall 4, a housing space 9 capable of housing other members, for example, the inner wall 11a of the rotor 11, the bearing 19, and the like as shown in FIG. 5 is formed. . The upper peripheral end face 1c of the outer peripheral wall 1 of the outer core member 3 and the upper peripheral end face 4b of the inner peripheral wall 4 of the inner core member 6 assembled as described above are cut so that both upper peripheral end faces 1b, 4b are flush with each other. Align so that it is horizontal.

[0032]

[Example of use of the electromagnetic clutch core of the present invention] When the electromagnetic clutch core of the present invention is used, a donut-shaped electromagnetic coil 7 is accommodated in the coil accommodating portion 8. At this time, since the upper part of the coil accommodating portion 8 is formed to be open outward, the electromagnetic coil 7 can be easily accommodated in the coil accommodating portion 8. Coil housing 8
The outer circumferential surface of the electromagnetic coil 7 housed in the coil housing portion 8 is formed by the outer circumferential wall 1, the inner circumferential surface is formed by the inner circumferential wall 1 forming the coil housing portion 8, and the bottom surface is formed by the coil housing portion 8. Each is covered by two bottom plates 5. At this time,
Since the lower portion 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 portion and the inner peripheral wall 4 to be displaced or accidentally detached from the coil housing portion 8. Nothing. Next, an insulating material is filled in the coil accommodating portion 8 accommodating the electromagnetic coil 7, and the electromagnetic coil 7 is fixed in the coil accommodating 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. Coil housing 8
A lead wire (not shown) of the electromagnetic coil 7 housed and fixed inside is drawn out of the coil housing portion 8 from an outlet opened by communicating with the first bottom plate 2 and the second bottom plate 5.

The above-described core for an electromagnetic clutch 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 is used as a core for an electromagnetic clutch used in other industrial machines. You can also. 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 may be used in such an electromagnetic clutch. Can be.

[0034]

According to the first aspect of the present invention, the inner surface 1a of the upper portion 50 of the outer wall 1 of the outer core member 3 and the outer surface 5a thereof are pressed when the second bottom plate 5 is press-fitted. Since the inner peripheral surface 1b of the lower portion 51 is made to have such a size that the outer peripheral surface 5a of the second bottom plate 5 is in close contact, the following effects are obtained. (1) When press-fitting the inner core member 6 inside the outer peripheral wall 1 of the outer core member 3, the outer peripheral surface 5 of the second bottom plate 5 of the inner core member 6
a does not come into contact with the inner peripheral surface 1 a of the upper part 50 of the outer peripheral wall 1 and smoothly enters the inner peripheral surface 1 b of the lower part 51 of the outer peripheral wall 1. It becomes easy to press-fit the inner core member 6 into the inside. Moreover, since the press-fitted inner core member 6 is securely held at the lower portion 51 of the outer peripheral wall 1 of the outer core member 3, the inner core member 6 rattles in the outer core member 3 or comes off from the outer core member 3. Or not. (2) Since the upper portion 50 of the outer peripheral wall 1 of the outer core member 3 is opened outward, the electromagnetic clutch 7 can be easily housed in the coil housing 8. (3) After the inner core member 6 is press-fitted inside the outer peripheral wall 1 of the outer core member 3, the upper portion 50 of the outer peripheral wall 1 of the outer core member 3 is caulked inward, so that the inner core member 6 can be further strengthened. It can also be ensured that it is held.

In the electromagnetic clutch core according to the second aspect, the first bottom plate 2 is formed inside the ring-shaped outer peripheral wall 1 of the outer core member 3 and the flange 10 is formed inside the first bottom plate 2. Unlike the electromagnetic clutch core, there is no need to attach the flange 10 formed separately from the core to the core,
There is also an effect that no labor is required for manufacturing the core assembly.

According to the third aspect of the present invention, since the outer core member 3 and the inner core member 6 are formed by pressing a metal plate, the manufacturing of the electromagnetic clutch core is easy and inexpensive. There is also the effect of becoming.

In the electromagnetic clutch core according to the fourth aspect, 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 press-fitted and overlapped with each other are further fixed by any fixing means. Therefore, there is also an effect that the fixing of the both bottom plates 2 and 5 is further ensured.

[Brief description of the drawings]

FIGS. 1A to 1F are views of a first embodiment of an electromagnetic clutch core according to the present invention, wherein FIG. 1A is a perspective view of an inner core member, and FIG. -X sectional view, (c) is a perspective view of the outer core member 3, (d) is an XX sectional view of the outer core member 3, (e) is a portion of the core in which the first and second core members are assembled. Sectional drawing, (f) is a detailed view of the outer core member.

FIGS. 2A to 2E are diagrams of a second embodiment of the electromagnetic clutch core of the present invention, wherein FIG. 2A is a perspective view of an inner core member, and FIG. -X sectional view, (c) is a perspective view of the outer core member, (d) is an XX sectional view of the outer core member 3, (e) is a partial cross section of the core in which the first and second core members are assembled. FIG.

3 (a) to 3 (c) are views of a third embodiment of an electromagnetic clutch core according to the present invention, and FIG. 3 (a) is a partial cross section of an inner core member having a second bottom plate having a projection. FIGS. 7B and 7C are partial cross-sectional views showing different examples of the outer core member in which the first bottom plate is provided with a projection.

FIGS. 4A and 4B are diagrams of a fourth embodiment of a core for an electromagnetic clutch according to the present invention, and FIG. 4A illustrates an inner core member having a protrusion protruding from an upper surface of a second bottom plate. FIG. 3B is a partial cross-sectional view illustrating a state where the inner core member is press-fitted inside the outer core member, and FIG.

5 (a) to 5 (e) are views of an embodiment of an electromagnetic clutch core according to the present invention, and FIG. 5 (a) shows a press-fit state of an inner core member having a protrusion protruding from a bottom surface of a second bottom plate. Partial sectional view, (b)
FIG. 4 is a partial cross-sectional view of a press-fit state of an inner core member having two protrusions protruding from a bottom surface of a second bottom plate, and FIG. 4C is a press-fit portion of a second bottom plate having a depression and a first bottom plate 2 having a protrusion. Sectional view, (d)
Is a partial cross-sectional view of an outer core member having a bead formed on a second bottom plate, and (e) is an outer core member having a second bottom plate with a protrusion and a first bottom plate with a protrusion. FIG. 3 is a partial cross-sectional view of a press-fit state with a core member.

FIGS. 6A to 6E are explanatory views showing an electromagnetic clutch core developed earlier by the present applicant, wherein FIG. 6A is a perspective view of an inner core member, and FIG. XX sectional view,
(C) is a perspective view of the outer core member 3, and (d) is the outer core member 3.
(E) is a partial sectional view of a core obtained by assembling the first and second core members.

7A is a perspective view showing an example of a conventional electromagnetic clutch core, and FIG. 7B is a sectional view taken along line XX of FIG. 7A.

FIG. 8 is a partial sectional view showing an example of a conventional electromagnetic clutch.

FIGS. 9A to 9G are explanatory views showing a conventional method for manufacturing a core for an electromagnetic clutch by cold forging.

[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 10 Flange 50 Upper part of the outer peripheral wall of the outer core member 51 Lower part of the outer peripheral wall of the outer core member 1a Inner periphery of the upper part of the outer peripheral wall Surface 1b Inner peripheral surface of lower part of outer peripheral wall 5a Outer peripheral surface of second bottom plate

Claims (4)

[Claims] 1. An outer core member (3) provided with a ring-shaped first bottom plate (2) inside a lower part of a cylindrical outer peripheral wall (1), and an outer side of a cylindrical inner peripheral wall (4). The inner core member (6) provided with the ring-shaped second bottom plate (5) is attached to the outer peripheral wall (1).
And an inner peripheral wall (4) inside thereof, and a core for an electromagnetic clutch which is press-fitted so that the first bottom plate (2) and the second bottom plate (5) overlap with each other. ) Is formed in such a size that the outer peripheral surface (5a) of the second bottom plate (5) does not come into close contact with the inner core member (6) when the inner core member (6) is press-fitted. The inner peripheral surface (1b) of the lower part (51) of (1) is formed in such a size that the outer peripheral surface (5a) comes into close contact with the inner core member (6) when the inner core member (6) is press-fitted. core. 2. An outer core member (3) having a first bottom plate (2) provided inside a lower portion of a cylindrical outer peripheral wall (1) and a flange (10) provided inside the first bottom plate (2). A cylindrical inner core member (6) provided with a ring-shaped second bottom plate (5) outside the inner peripheral wall (4) is opposed to the outer peripheral wall (1) and the inner peripheral wall (4) inside thereof. An electromagnetic clutch core formed by press-fitting the first bottom plate (2) and the second bottom plate (5) so as to overlap each other, and the inner peripheral surface (1a) of the upper portion (50) of the outer peripheral wall (1). ) Is the second bottom plate (5) when the second bottom plate (5) is press-fitted.
Is formed in such a size that the outer peripheral surface (5a) of the
The inner peripheral surface (1b) of the lower part (51) of the outer peripheral wall (1) is the second
A core for an electromagnetic clutch, wherein an outer peripheral surface (5a) of the bottom plate (5) is formed in such a size that the outer peripheral surface (5a) comes into close contact with the bottom plate when the bottom plate (5) is press-fitted. 3. The electromagnetic clutch core according to claim 1, wherein the outer core member and the inner core member are formed by pressing a metal plate. . 4. 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 press-fitted and overlapped, are fixed by any fixing means. The electromagnetic clutch core according to any one of claims 1 to 3, wherein: