JP2001012506A - Electromagnetic clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the damage caused by attaching a lead wire with a frame, and improve reliability by constituting an electromagnetic clutch of an electromagnetic coil and a bobbin for winding the electromagnetic coil, and arranging outlets of the lead wire connected to the electromagnetic coil on both sides of an axial direction end surface and a outer peripheral surface of the bobbin. SOLUTION: An electromagnetic clutch 1 provided with an electromagnetic coil 3, a bobbin 4 for winding the electromagnetic coil 3, and the like is formed in such a constituted that an armature 9 is attracted by current-carrying to be attracted to one surface of a rotor 7 and power transmitted to a gear 10 is transmitted to a cylindrical shaft 5. A lead wire drawing part 4d housed in a field core 2 is formed on one side of flange parts 4ba formed on both sides of a barrel part 4a around which the electromagnetic coil 3 is wound, in a bobbin 4 of the electromagnetic clutch 1. The lead wire connected to the electromagnetic coil 3 is drawn through the lead wire outlet formed on the lead wire drawing-out part 4d and a cutout part 2c formed on an axial direction end surface of the field core 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic clutch used, for example, for feeding a copying machine, and more particularly, to a structure of a bobbin incorporated in an electromagnetic clutch and wound with an electromagnetic coil.

[0002]

2. Description of the Related Art Conventionally, there has been known an electromagnetic clutch for selectively transmitting a driving force of an input rotary element which is driven to rotate. FIG. 4 shows an example of this electromagnetic clutch. FIG. 4 (a)
FIG. 4 is an exploded perspective view of a conventional electromagnetic clutch, and FIG.
FIG. 4 is a perspective view showing an elastic member used in a conventional electromagnetic clutch.

As shown in FIG. 4A, the electromagnetic clutch includes a field core 2, a cylindrical shaft 5, a rotor 7, an armature 9, and a gear 10.

In the field core 2, an electromagnetic coil and a bobbin are incorporated. The electromagnetic coil is wound around the body of the bobbin. The field core 2 has a cutout 2c for leading out a lead wire 18 connected to the electromagnetic coil.
Is provided. The field core 2 has an end face 2d only on one side in the axial direction as shown in FIG.
c is provided on the side opposite to the end face 2d.

[0005] The rotor 7 is fixed by caulking to the outer periphery of the cylindrical shaft 5. The armature 9 and the elastic member 8 are fixed by a caulking portion 14 as shown in FIG. The armature 9 is fixed to the gear 10 via three screws 19. The armature 9 is provided with a notch 15 for receiving a screw 19. The gear 10 has a cylindrical portion 17 that receives the screw 19. Further, the elastic member 8 is provided with a through hole 16 for receiving the screw 19.

When assembling the electromagnetic clutch, a plate is caulked and fixed to the axial end face 2 d of the field core 2 in advance, and the rotor 7 is caulked and fixed to the cylindrical shaft 5. The armature 9 and the elastic member 8 are connected to the gear 1 by a screw 19.
0 and these are externally fitted to one end of the cylindrical shaft 5. Then, the other end of the cylindrical shaft 5 is inserted into the field core 2.

By energizing the electromagnetic coil incorporated in the field core 2 of the conventional electromagnetic clutch having the above-described configuration, the armature 9 is opposed to the one side of the rotor 7 against the elastic action of the elastic member 8 by magnetic attraction. Is adsorbed. Thereby, the armature 9 and the rotor 7 are connected, and the power transmitted to the gear 10 is transmitted to the cylindrical shaft 5.

On the other hand, when the power supply to the electromagnetic coil is stopped,
The armature 9 is separated from the rotor 7 by the elastic action of the elastic member 8, and the connection state between the armature 9 and the rotor 7 is released. Thereby, the power from the gear 10 is not transmitted to the cylindrical shaft 5.

By controlling the energization of the electromagnetic coil in this manner, the power transmitted to the gear 10 can be selectively transmitted to the cylindrical shaft 5.

[0010]

However, the conventional electromagnetic clutch has the following problems.

In FIG. 4, the lead wire 18 is drawn radially outward of the field core 2. However, it is necessary to draw the lead wire 18 in the axial direction of the field core 2 depending on the internal structure of a device incorporating the electromagnetic clutch. It may be.

In this case, for example, as shown in FIG. 5, a fixing member 20 is attached to the outer periphery of the field core 2 to protect the lead wire 18 and to fix the lead wire 18 to the outer periphery of the field core 2, 18 was drawn out in the axial direction of the field core 2. For this reason, not only the fixing member 20 is required, but also the mounting work of the fixing member 20 is required, which is one of the factors that increase the manufacturing cost.

A frame having a clutch hole for receiving an end face of the field core 2 may be installed in a device such as a copying machine. As shown in FIG. When pulled out in the axial direction, it is necessary to provide a notch or the like in the clutch hole and allow the lead wire 18 to pass therethrough. In this case, there is also a problem that the lead wire 18 is likely to be damaged by hitting the frame.

The present invention has been made to solve the above-mentioned problems. An object of the present invention is to provide an electromagnetic clutch that can suppress the above-described damage to the lead wire and can also reduce the manufacturing cost.

[0015]

An electromagnetic clutch according to the present invention includes an electromagnetic coil and a bobbin around which the electromagnetic coil is wound. And the lead-out opening of the lead wire connected to an electromagnetic coil is provided in both the axial end surface and the outer peripheral surface of the bobbin. Here, the lead wire outlet refers to a portion from which the lead wire can be pulled out.

By providing a lead wire outlet (a portion from which a lead wire can be drawn out) on both the axial end surface and the outer peripheral surface of the bobbin as described above, when the lead wire is drawn in the axial direction of the field core, The lead wire can be drawn out from the outlet on the axial end surface of the bobbin. When the lead wire is drawn radially outward of the field core, the lead wire can be drawn out from the outlet on the outer peripheral surface side of the bobbin. Therefore, there is no need to extend the lead wire on the outer periphery of the field core as in the conventional example shown in FIG. 5, and it is not necessary to attach a fixing member to the field core to protect the lead wire. Thereby, the manufacturing cost can be reduced. In addition, when the lead wire is drawn out from the axial direction of the field core, the lead wire can be drawn out from the above-described clutch hole. The line can be prevented from being damaged by hitting the frame. As described above, according to the present invention, not only the reliability of the electromagnetic clutch can be improved, but also the manufacturing cost can be reduced.

Preferably, the bobbin has a body around which an electromagnetic coil is wound, a pair of flanges on both sides of the body, and a lead wire lead protruding from the surface of one of the flanges in the axial direction of the bobbin. And a part. At this time, lead wire outlets are provided on the end face of the bobbin on the outer peripheral side of the lead wire lead-out part and on the axial end face of the bobbin in the lead wire lead-out part.

By providing the lead wire lead-out portion projecting in the axial direction of the bobbin as described above, it is possible to provide lead wire outlets on both the axial end face and the outer peripheral end face of the bobbin, and the field core can be provided. The lead wire can be drawn out in both the axial direction and the radial direction.

The electromagnetic clutch has a field core that houses an electromagnetic coil and a bobbin. The field core preferably has a bent portion at one end in the axial direction, and the lead wire lead-out portion is preferably arranged on the bent portion side of the field core. At this time, the field core preferably has a notch extending from the axial end surface of the field core located on the bent portion side to the outer peripheral surface to expose a lead wire outlet.

By arranging the lead wire lead-out portion on the bent portion side of the field core, it is possible to expose both lead-out holes of the lead wire only by providing the above-described cutout portion in the field core. Thereby, the lead wire can be drawn out in both the axial direction and the radial direction of the field core.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of an electromagnetic clutch according to one embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a sectional view showing an electromagnetic clutch 1 according to one embodiment of the present invention. FIG. 2 is an exploded perspective view of the electromagnetic clutch 1 shown in FIG.

First, referring to FIG. 1, the electromagnetic clutch 1
Field core 2, cylindrical shaft 5, sleeve 6, rotor 7, elastic member 8, armature 9, gear 10
And a bushing 13.

The cylindrical shaft 5 is made of, for example, plastic or the like, into which one end of a driven shaft such as a support shaft of a timing roller in a copying machine is inserted. A metal sleeve 6 is mounted on the outer periphery of the cylindrical shaft 5.

On the outer periphery of the sleeve 6, the field core 2
Is attached. An electromagnetic coil 3 made of copper wire or the like and a bobbin 4 that covers the electromagnetic coil 3 are incorporated in the field core 2. The electromagnetic coil 3 is wound around the body of the bobbin 4, and lead wires are connected to both ends of the electromagnetic coil 3. The lead wire is drawn out through a notch 2 c provided in the field core 2. A plate for preventing rotation of the field core 2 is attached to an end surface of the field core 2 in the axial direction. The above-mentioned field core 2, electromagnetic coil 3
The sleeve 6 functions as electromagnetic means for generating an electromagnetic force for attracting the armature 9 to the rotor 7.

On the outer periphery of the cylindrical shaft 5 is mounted a rotor 7 which rotates integrally with the cylindrical shaft 5 in the circumferential direction. In the embodiment shown in FIG. 1, the rotor 7 is constituted by an integrated press-formed product, but may be constituted by a plurality of parts. A bushing 13, an elastic member 8, and an armature 9 are rotatably fitted to the cylindrical shaft 5 at positions adjacent to the rotor 7. A gap D exists between the rotor 7 and the armature 9, and the armature 9 is driven by the electromagnetic force generated by the electromagnetic means.
Is attracted to the rotor 7, the gap D becomes zero.

A gear 10 which engages directly or indirectly with the bushing 13, the elastic member 8 and the armature 9 in the circumferential direction of the cylindrical shaft 5 and rotates integrally therewith is provided with a gear 10.
Is fitted to the outside. The gear 10 has a function as a power transmission member, and the power transmitted to the gear 10 is selectively transmitted to the cylindrical shaft 5. Thereby, the above-mentioned driven shaft is selectively rotated. Note that a power transmission member such as a pulley or a sprocket may be used instead of the gear 10. A retaining ring 11 is attached to one end of the cylindrical shaft 5 via a shim 12. By these, bushing 1
3. Positioning of the elastic member 8, the armature 9, and the gear 10 and prevention of the gear 10 from coming off are performed.

Next, the method of assembling the electromagnetic clutch shown in FIG. 1 and the structure of each element will be described in more detail with reference to FIGS.

Referring to FIG. 2, a flange 5b is provided at one end of cylindrical shaft 5, and a groove 5c is provided at the other end. Further, on the outer surface of the cylindrical shaft 5 located on the flange portion 5b side, an engaging portion 5a which engages with the sleeve 6 in the circumferential direction of the cylindrical shaft 5 is provided. In this case, four protrusions are provided on the outer periphery of the cylindrical shaft 5, but other structures that can engage with the sleeve 6 can be adopted. For example, a groove, a light slope, or the like may be provided on the outer periphery of the cylindrical shaft 5.

Four grooves 6a for receiving the above-mentioned engaging portions 5a are provided on the inner circumference at one axial end of the sleeve 6. Also, on the inner periphery of the other end of the sleeve 6 in the axial direction,
A groove for receiving an engagement portion 7a of the rotor 7 described later is provided. By providing grooves at both ends of the sleeve 6 in this manner, the cylindrical shaft 5 and the rotor 7 can be engaged with the cylindrical shaft 5 in the circumferential direction via the sleeve 6. The sleeve 6 having such a structure is mounted on the outer periphery of the cylindrical shaft 5 from the groove 5c side.

Next, the field core 2 having the bobbin 4 is mounted on the outer periphery of the sleeve 6. This field core 2 is also mounted from the groove 5c side. Thereby, the axial end surface 2d of the field core 2 and the flange portion 5b engage.

At this time, the plate is caulked and fixed to the axial end face 2d of the field core 2 in advance. The plate is fixed to the field core 2 by guide portions 2a and fixing portions 2b provided on the axial end surface 2d. The above-described cutout portion 2c is provided so as to extend from the axial end surface 2d of the field core 2 to the outer peripheral surface, and the lead wire 18 is drawn out from the cutout portion 2c as shown in FIG.

Here, the structure of the bobbin 4 according to the present invention will be described in detail with reference to FIG. As shown in FIG. 3A, the bobbin 4 is integrally formed of, for example, plastic and has a body 4a around which the electromagnetic coil 3 is wound, and a pair of flanges 4 provided substantially parallel to both sides of the body 4a.
b, 4c and a cover plate 4g provided at intervals on the flange portion 4b.

FIG. 3B is a partial sectional view showing the structure of the bobbin 4 when the bobbin 4 is cut along a plane crossing directly below the cover plate 4g in FIG. 3A. FIG.
As shown in (b), a pair of notches 4b1 and 4b2 are provided in the flange 4b at intervals. Both ends (start and end of winding) of the electromagnetic coil 3 are pulled out from the cutouts 4b1 and 4b2 onto the flange 4b, and the electromagnetic coil 3 and the lead wire 18 are connected via a connecting portion 4i made of solder or the like.
And connect. Terminal of electromagnetic coil 3 and lead wire 18
Is wound around a lead wire guide 4h extending in the axial direction of the bobbin 4 from the flange 4b. A cover plate 4g is provided on the lead wire guide 4h.

As shown in FIG. 3A, the flange portion 4b
4d is provided so as to protrude from the surface of the bobbin 4 in the axial direction. An end face of the lead wire lead-out portion 4d located on the outer peripheral side of the bobbin 4;
Lead wire outlets 4e and 4f are provided on the end surface of the bobbin 4 in the axial direction at d. In this case, although the lead wire outlets 4e and 4f are formed by forming openings in the respective end surfaces, either one (unused side) may be closed.

As shown in FIG. 3B, the lead wire lead-out portion 4d is connected to the lead wire guide portion 4h from the lead wire outlet 4e.
Side (inward in the radial direction of the bobbin 4),
A lead-receiving passage that penetrates through d is provided. Through this passage, the lead wire can be drawn radially outward of the bobbin 4 (radially outward of the field core 2). Further, a lead wire receiving passage extending in the axial direction of the bobbin 4 from the lead wire outlet 4f is provided so as to communicate with the passage. Through this passage, the lead wire can be drawn out in the axial direction of the bobbin 4 (axial direction of the field core 2).

As shown in FIG. 1, the lead wire lead-out portion 4d is disposed on the axial end face 2d side of the field core 2 (the bent portion at one axial end of the field core 2). Then, the above-described cutout portion 2c is provided in the field core 2 so as to expose the lead wire outlets 4e and 4f. Thereby, the lead wire 18 can be drawn out not only in the axial direction of the field core 2 but also in the radial direction.

After the field core 2 having the above structure is mounted on the outer periphery of the sleeve 6, the rotor 7 is fitted over the cylindrical shaft 5. The rotor 7 includes an engagement portion 7 that projects in the axial direction of the cylindrical shaft 5.
a near the inner circumference. The engaging portion 7a is inserted into the groove on the other end of the sleeve 6. Thereby, the rotor 7 and the sleeve 6 can be engaged in the circumferential direction of the cylindrical shaft 5. Since the rotor 7 can be mounted on the cylindrical shaft 5 simply by mounting the rotor 7 on the cylindrical shaft 5 from the groove 5c side, there is no need to fix the rotor 7 to the cylindrical shaft 5 by caulking. Thereby, the deformation of the rotor 7 and the inclination of the rotor 7 with respect to the cylindrical shaft 5 can be suppressed, the poor suction of the armature 9 to the rotor 7 can be suppressed, and the power transmission loss from the armature 9 to the rotor 7 can be reduced. can do. Note that the rotor 7 may be directly engaged with the cylindrical shaft 5.

The bushing 13 is made of, for example, plastic and has a cylindrical portion 13b and three convex portions 13a on its outer periphery. The cylindrical portion 13b is rotatably mounted on the outer peripheral surface of the cylindrical shaft 5, and has a function of adjusting a gap D between the rotor 7 and the armature 9. Specifically, the gap D can be adjusted by adjusting the axial length of the cylindrical portion 13b. Thereby, not only the troublesome operation of adjusting the gap between the rotor 7 and the armature 9 as in the conventional example is not required, but also the variation of the gap D can be reduced.

The projection 13a projects radially outward of the bushing 13 and has a pressing portion 13c on the rotor 7 side. The pressing portion 13c is formed by expanding the convex portion 13a in the circumferential direction of the cylindrical portion 13b, engages the elastic member 8 with the cylindrical shaft 5 in the axial direction, and presses and fixes the elastic member 8 to the armature 9 side. It has a function to do. The bushing 13 having the above-described structure is fitted on the cylindrical shaft 5 so that one end surface thereof is in contact with the rotor 7.

The elastic member 8 is made of a metal such as stainless steel and has an annular shape. Also, the elastic member 8
Are three elastic portions 8a projecting radially outward from the outer periphery.
And three notches 8b on the inner periphery. Elastic part 8a
Engages with the armature 9 in the axial direction of the cylindrical shaft 5, and urges the armature 9 in a direction separating from the rotor 7. The notch 8b receives the protrusion 13a on the outer periphery of the bushing 13 and engages with the protrusion 13a in the circumferential direction of the cylindrical shaft 5. The elastic member 8 having such a structure is fitted around the cylindrical shaft 5. At this time, the projection 13a of the bushing 13 is fitted into the cutout 8b.

The metal armature 9 has three concave portions 9a on the inner periphery and has an annular shape. The concave portion 9a is provided at a position corresponding to the elastic portion 8a on the end face on the rotor 7 side, and receives the elastic portion 8a. Thereby, the armature 9 and the elastic portion 8a can be engaged in the circumferential direction of the cylindrical shaft 5. On the end surface (rear surface) of the armature 9 on the gear 10 side, a convex portion (9b in FIG. 1) protruding in the axial direction of the cylindrical shaft 5 is provided. This convex portion is fitted into a concave portion 10 d provided in the gear 10, and the armature 9 and the gear 1 are fitted.
0 directly engages in the circumferential direction of the cylindrical shaft 5. The armature 9 having the above structure is fitted on the cylindrical shaft 5. At this time, the elastic portion 8a of the elastic member 8 is accommodated in the recess 9a of the armature 9.

The gear 10 is made of, for example, plastic and has a plurality of convex portions 10a and 10c on one end surface. The projections 10a and 10c both project in the axial direction of the cylindrical shaft 5. The convex portion 13a is received in the concave portion 10b between the convex portions 10a, and the convex portion 10a and the convex portion 13a are
In the circumferential direction. The convex portion 10c is provided outside the convex portion 10a, and receives the convex portion 9b (see FIG. 1) of the armature 9 in the concave portion 10d between the convex portions 10c, and the convex portion 10c and the convex portion 9b In the circumferential direction.

The gear 10 having such a structure is fitted around the cylindrical shaft 5. At this time, the convex portion 13a of the bushing 13 is received in the concave portion 10b, and the convex portion 9b on the back surface of the armature 9 is received in the concave portion 10d. Thereby, the bushing 13,
The elastic member 8, the armature 9, and the gear 10 can be engaged directly or indirectly in the circumferential direction of the cylindrical shaft 5. As a result, the bushing 13, the elastic member 8, the armature 9, and the gear 10 can be integrally rotated in the circumferential direction of the cylindrical shaft 5.

As described above, up to the gear 10 and the cylindrical shaft 5
After that, the shim 12 and the retaining ring 11 are attached to the cylindrical shaft 5. The number of the shims 12 can be arbitrarily selected.
Position adjustment such as 0 can be performed. In addition, the retaining ring 11 is attached to the groove 5c on the outer periphery of the tubular portion 5 to prevent each element from coming off.

As described above, since each element only needs to be simply fitted onto the cylindrical shaft 5, the screwing operation as in the conventional example is not required at all, and the caulking operation can be reduced. Therefore, the assembling time of the electromagnetic clutch can be significantly reduced as compared with the conventional example.

As described above, one embodiment of the present invention has been described. However, the above-described embodiment is merely an example, and the present invention is not limited thereto.

For example, if the bobbin 4 and the field core 2 have a structure in which the lead wire 18 can be drawn out in both the axial direction and the radial direction of the bobbin 4 and the field core 2, a structure other than the above is adopted. It is possible. Further, as for the structure of the bobbin 4 itself, other structures can be adopted as long as the bobbin 4 has the outlets 4e and 4f of the lead wires 18 on the axial end surface and the outer peripheral surface. In addition, bobbin 4
May be integrally formed of plastic or the like, or may be formed by combining a plurality of components.

The shapes and positions of the projections 13a, 10a, and 10c can be other than those described above. Further, the recess 10 d,
Forming 10b is also conceivable. Also, the elastic portion 8a
Can also be arbitrarily selected for the shape and number of. Also,
Regarding the engagement relationship between the bushing 13, the elastic member 8, the armature 9, and the gear 10, as long as they can be engaged directly or indirectly in the circumferential direction of the cylindrical shaft 5, other engagements than those described above are possible. Aspects can be employed.

That is, it is intended from the beginning to add changes and modifications within the scope equivalent to the invention described in the claims to the above-described embodiment.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an electromagnetic clutch according to one embodiment of the present invention.

FIG. 2 is an exploded perspective view of the electromagnetic clutch shown in FIG.

FIG. 3A is a perspective view of a bobbin according to the present invention. (B) is a partial sectional view of the bobbin shown in (a).

FIG. 4A is an exploded perspective view of a conventional electromagnetic clutch. (B) is a perspective view showing an example of a conventional elastic member.

FIG. 5 is a partial perspective view of an electromagnetic clutch for explaining a problem in a conventional example.

[Explanation of symbols]

Reference Signs List 1 electromagnetic clutch, 2 field core, 2a guide portion, 2b fixing portion, 2d axial end face, 3 electromagnetic coil, 4 bobbin, 4a trunk portion, 4d lead wire lead-out portion,
4e, 4f Lead wire outlet, 4g cover plate,
4h Lead wire guide, 4i connection, 5 cylindrical shaft, 5
a, 7a engaging portion, 4b, 4c, 5b flange portion, 5
c, 6a, 7b groove, 6 sleeve, 7 rotor, 8
Elastic member, 8a elastic portion, 8b, 4b1, 4b2 cutout portion, 9 armature, 9a, 10b, 10d concave portion, 9b, 10a, 10c, 13a convex portion, 10 gear, 11 retaining ring, 12 shim, 13 bushing, 13
b cylindrical part, 13c pressing part, 18 lead wire, 20
Fixing member.

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[Procedure amendment]

[Submission date] January 27, 2000 (2000.1.2
7)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction contents]

[0017] The bobbin conductive magnetic and the body coil is wound, the flange portion of the pair on each side of the body portion, of one
And a lead wire outlet portion protruding from the surface of the flange portion in the axial direction of the bobbin. At this time, lead wire outlets are provided on the end face of the bobbin on the outer peripheral side of the lead wire lead-out part and on the axial end face of the bobbin in the lead wire lead-out part.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction contents]

The electromagnetic clutch has a field core that houses an electromagnetic coil and a bobbin. The field core has a bent portion at one end in the axial direction, and the lead wire lead-out portion is
It is disposed in the bent portion of the full Irudokoa. In this case, field core has a cut-out portion exposing the outlets of the extension Mashimashi lead over the outer peripheral surface from the axial end surface of the field core on which it is located Symbol bent portion.

[Procedure amendment]

[Submission Date] May 12, 2000 (2000.5.1)
2)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction contents]

[0017] The bobbin may feel protrudes and the body of the electromagnetic coil is wound, the flange portion of the pair on each side of the body portion, the surface of the one flange portion in the axial direction of the bobbin
And a lead wire outlet portion that will be housed in-core. At this time, lead wire outlets are provided on the end face of the bobbin on the outer peripheral side of the lead wire lead-out part and on the axial end face of the bobbin in the lead wire lead-out part.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction contents]

The electromagnetic clutch has a field core that houses an electromagnetic coil and a bobbin. The field core has a corner portion at one end in the axial direction, and the lead wire lead-out portion is arranged near the corner portion of the field core. At this time, the field core has a notch extending from the axial end surface of the field core located on the corner side to the outer peripheral surface to expose the lead wire outlet.

Claims (3)

[Claims] 1. An electromagnetic clutch, comprising: an electromagnetic coil; and a bobbin around which the electromagnetic coil is wound, wherein both an axial end surface and an outer peripheral surface of the bobbin are provided with an outlet for a lead wire connected to the electromagnetic coil. . 2. The bobbin includes a body around which the electromagnetic coil is wound, and a pair of flanges on both sides of the body.
A lead wire lead-out portion protruding from the surface of the one flange portion in the axial direction of the bobbin; an end face of the bobbin on the outer peripheral side in the lead wire lead-out portion; and an axis of the bobbin in the lead wire lead-out portion. The electromagnetic clutch according to claim 1, further comprising an outlet of the lead wire at an end face in a direction. 3. The electromagnetic clutch includes a field core that houses the electromagnetic coil and the bobbin, the field core has a bent portion at one end in an axial direction, and the lead wire lead-out portion is disposed on the bent portion side. 3. The electromagnetic clutch according to claim 2, wherein the field core has a notch extending from an axial end surface of the field core located on the bending portion side to an outer peripheral surface and exposing an outlet of the lead wire. 4. .