JP3365715B2 - Electromagnetic clutch - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic clutch, and more particularly to an electromagnetic clutch having a structure that is easy to assemble.

[0002]

2. Description of the Related Art A conventional electromagnetic clutch is constructed, for example, as shown in FIG. The electromagnetic clutch shown in FIG. 3 is applied to a sheet feeding mechanism of a copying machine, and has a housing 206 having an opening 202 on one surface and a bottom portion 204 on the other surface facing the housing 206, and an opening of the housing 206. It comprises a field 210 composed of a cover 208 covering the 202. The bottom 20 of this field 210
4 has a through hole 205 formed in the center of the bearing 2
12 is provided, and the bearing 208 is provided in the through hole 209 formed in the center of the cover 208 of the field 210.
Is provided.

The field 210 also includes a bottom portion 204.
The shaft 216 is rotatably arranged so as to penetrate the bearing 212 of the cover 208 and the bearing 214 of the cover 208. A cylindrical body 218 is rotatably fitted to the outer circumference of the shaft 216 from a substantially central position in the field 210 to an external position on the bottom 204 side of the field 210. The gear 22 is located outside the field 210 of the tubular body 218.
0 is fitted.

In the field 210, an exciting coil 224 having a through hole 222 in the center is loosely fitted in the cylindrical body 218 and fixed to the bottom 204 side. Further, in the field 210, a support member 226 is rotatably fitted to the shaft 216 at a position adjacent to the exciting coil 224. The support member 226 has a plate spring 228 on the cover 208 side and an armature. 230 is attached. The support member 226 is integrally connected to the tubular body 218 by a coil spring 232 and is rotatable together with the tubular body 218. Further, in the field 210, a rotor 236 having a slit 234 is integrally attached to the shaft 216 at a position adjacent to the armature 230.

The electromagnetic clutch constructed as described above is
When the cylinder 218 rotates around the outer circumference of the shaft 216 by the rotation of the gear 220 by an external drive source, the support member 226 rotates together with the cylinder 218, thereby rotating the armature 230. Now
When the exciting coil 224 is energized, a magnetic flux is generated by the exciting coil 224 in a magnetic path formed by the shaft 216, the housing 206 of the field 210, and the rotor 236, and the leakage flux generated in the slit 234 of the rotor 236 causes the rotor 236 to leak. Adsorption force occurs. Therefore, the armature 230 is attracted to the rotor 236 against the elastic force of the leaf spring 228. As a result, the rotor 23
6 is rotated by the drive source that rotates the gear 220, and the shaft 216 integrated with the rotor 236 rotates.

On the other hand, when the excitation coil 224 is de-energized, the magnetic flux disappears and the attraction force between the rotor 236 and the armature 230 disappears. As a result, the armature 230 is supported by the elastic force of the leaf spring 228. Member 226
Will be pulled back to the side and separated from the rotor 236. As a result, even if the gear 220 rotates, the shaft 2
The rotation of 16 stops.

[0007]

However, in the electromagnetic clutch constructed as described above, since the exciting coil 224 is fixed in the field 210 with an adhesive, the adhesive applying step and the adhesive are performed. And a complicated drying process for the electromagnetic clutch,
There is a problem that the assembly time becomes long.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an electromagnetic clutch which can simplify the assembly process and shorten the assembly time and which can be easily assembled.

[0009]

In order to achieve the above object, an electromagnetic clutch according to a first aspect of the present invention has a bottomed bottom having an opening.
Of a field-shaped housing and a cover covering the opening, a shaft that penetrates the inside of the field and is rotatably attached to the field, and is disposed on the bottom side of the field , a rotor rotatably mounted on the shaft, it is connected to the shaft in the field by connecting means, put in the field
A support member disposed on the opening side of the rotor, an armature mounted on the support member via a leaf spring and disposed on the side facing the rotor, and around a shaft in the field. Yes, in the above field
And a said support member and the exciting coils disposed on opposite sides a cover side, the exciting coil is flanged bobbin
The winding is wound around the bobbin and
Has a plurality of protrusions formed along the radial direction,
The housing is formed in the opening along the circumferential direction.
A plurality of first notches and a bottom portion of the first notches
Has a plurality of second notches each extending to the side,
The cover has a peripheral edge,
The above-mentioned excitation has a plurality of protrusions formed at corresponding positions.
The coil has its protrusion engaged with the second notch.
Is fixed to the housing by the
Is engaged with the first notch and is caulked
It is characterized by being fixed to the housing more .

In the electromagnetic clutch according to the first aspect, the rotational force is applied to the rotor from an external drive source. Then, when the exciting coil is not energized, the shaft is stopped even if the rotor is rotated, but when the exciting coil is energized, an attraction force is generated in the rotor and the armature is attracted to the rotor. As a result, the armature and the support member rotate, and the shaft connected to the support member rotates. Also, the protrusion formed on the collar of the bobbin
As a result of being engaged with the second notch formed in the housing and fixing the exciting coil to the housing forming the field, the adhesive applying step and the drying step are unnecessary.

An electromagnetic clutch according to a second aspect is the electromagnetic clutch according to the first aspect, wherein the connecting means is a coil spring.
This coil spring has one end locked to the shaft.
The other end of the coil spring is locked to the support member.
It is characterized in that was.

[0012] In the electromagnetic clutch according to the second aspect, b
The armature is attracted to the motor and the support member begins to rotate.
Then, the rotational force of the supporting member is sheared via the coil spring.
To the shaft, which causes the shaft to rotate .

An electromagnetic clutch according to a third aspect is the electromagnetic clutch according to the second aspect, wherein the rotor is the shuffle.
It has a cylindrical body that is rotatably fitted to the
The end of the cylindrical body of the
The drive force transmission member is attached to the protruding part.
It is characterized by being attached .

[0014] In the electromagnetic clutch according to the claim 3, full
The drive mounted on the cylindrical part protruding outside the field.
Rotational force is applied to the power transmission member from an external drive source,
The rotor is rotated by the rotational force applied to the driving force transmission member of
Roll over .

[0015]

1 is a sectional view of an electromagnetic clutch according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view thereof. In these drawings, the electromagnetic clutch is composed of a cylindrical housing 16 having an opening 12 on one surface and a bottom portion 14 on the other surface facing the electromagnetic clutch, and a plate-like cover 18 covering the opening 12 of the housing 16. Field 20
Is equipped with.

A plurality of square-shaped notches 22 (three in the drawing) are formed at the periphery of the opening 12 of the housing 16 at equal intervals in the circumferential direction, and at the periphery of the cover 18,
A rectangular protrusion 24 is formed at a position corresponding to each notch 22 of the housing 16. The protrusion 18 of the cover 18 is fitted into the notch 22 of the housing 16 and is disposed in the opening 12, and the cover 18 is fixed to the housing 16 by caulking the protrusion 24.

A rectangular cut 25, which is a locking means for engaging with a projection 98 of an exciting coil 88, which will be described later, is provided at the center of the cut 22 of the housing 16 so as to extend toward the bottom 14 side. A concave groove 27 is formed at an appropriate position on the periphery of the opening 12 so as to lead a lead wire 96 of an exciting coil 88, which will be described later, to the outside.

A through hole 28 is formed in the center of the bottom portion 14 of the housing 16, and a bearing 29 is fitted in the through hole 28. The through hole 28 has a detent shape having a linear portion in part, and the fitting portion of the bearing 29 to the through hole 28 has a shape matching the through hole 28. Further, the cover 18 is formed with a rotation-stopping projection 30 protruding in the radial direction on the periphery thereof, and
A through hole 31 is formed in the central portion, and a bearing 32 is fitted in the through hole 31.

The field 20 has a cylindrical shaft 3
4 is rotatably arranged so as to penetrate the bearing 28 of the bottom portion 14 and the bearing 32 of the cover 18. This shaft 34
Has a small diameter portion 35 slightly longer than ½ of the entire length and a large diameter portion 37 slightly shorter than the small diameter portion 35.
The 5 side penetrates the bearing 28, and the large diameter portion 37 side penetrates the bearing 32. A washer groove 36 is formed on the peripheral surface of the end of the small diameter portion 35. Further, a flange-shaped stopper 40 is provided on the peripheral surface of the intermediate portion of the large diameter portion 37, and the end portion of the large diameter portion 37 constitutes a paper feed mechanism or the like inserted into the shaft 34. Screw hole 38 for fixing the shaft
Are formed.

In the field 20, a disk-shaped rotor 42 having a plurality of arc-shaped (three in the figure) slits 41 inside the peripheral edge is rotatably attached to the shaft 34 and arranged on the bottom 14 side. There is. The rotor 42 is provided with a tubular body 44 having an outer tubular portion 441 projecting toward the bottom portion 14 side of the rotor 42 and an inner tubular portion 442 projecting toward the cover 18 side of the rotor 42 at the center thereof. 44 is rotatably fitted to the small diameter portion 35 of the shaft 34.
The outer cylinder portion 441 of the cylinder body 44 has a part 44
1a is projected to the outside of the field 20 along the peripheral surface of the shaft 34, and the protruding portion 4 outside the field 20 is provided.
A gear 46 as a driving force transmission member having a through hole 45 at the center is fitted in 41a. A washer 47 is provided at a position where the cylindrical body 44 and the large-diameter portion 37 of the shaft 34 are joined in the axial direction so as to ensure good sliding between the two. In addition, the washer groove 36 of the shaft 34
The washer 48 is fitted to the
It prevents you from getting out of 1a.

In the through hole 45 of the gear 46, the end portion of the shaft 34 is fitted in the central portion of the through hole 45, and the protruding portions 441 of the cylindrical body 44 are provided in the extending portions 451 formed at the opposing positions.
a is fitted. The outer diameter of the cylindrical body 44 is set to be substantially the same as the outer diameter of the large diameter portion 37 of the shaft 34, and both are substantially the same when the cylindrical body 44 is fitted in the large diameter portion 37. It is located within the outer peripheral surface.

A coil spring 50 as a connecting member is fitted to the shaft 34 so as to extend over the large diameter portion 37 and the inner cylindrical portion 442 of the cylindrical body 44. This coil spring 50
The one end portion 52 located on the large diameter portion 37 side has the coil spring 5
0 is bent toward the axial center, the other end 54 located on the cylinder 44 side is bent toward the outer circumference of the coil spring 50, and one end 52 is formed on the large diameter portion 37. It is locked in the hole 39. This coil spring 50 has one end 52.
When a clockwise rotating force is applied to the other end portion 54 in a state of being locked in the locking hole 39 as viewed from the right side of FIG. 1,
The coil spring 50 is wound in a direction in which it is tightened, and its position is regulated by the stopper 40 of the shaft 34.

A coil spring 50 is attached to the shaft 34.
A plate-like support member 58 having a through hole 56 having a diameter larger than the outer diameter of the coil spring 50 is fitted in the center portion of the support member 58. A cylindrical portion 62 is formed around the through hole 56 on the surface of the support member 58 on the rotor 42 side. Further, the support member 58 is formed with a locking hole 60 which is continuous with the through hole 56 and which locks the other end 54 of the coil spring 50, and the cylindrical portion 62 is surrounded by the locking hole 60. Has also been extended. Further, a plurality of (three in the figure) screw holes 64 for fixing a leaf spring 68 described later are formed in the support member 58 at equal intervals in the circumferential direction, and a plurality of (three in the figure) screw holes 64 are formed in the peripheral edge. Concave grooves 66 are formed at equal intervals at positions between the screw holes 64.

A plate-shaped armature 70 is attached to the surface of the support member 58 on the rotor 42 side via a plate spring 68.

That is, in the leaf spring 68, a through hole 72 having a diameter larger than the outer diameter of the cylindrical portion 62 of the support member 58 is formed in the central portion thereof, and it corresponds to the locking hole 60 of the support member 58. A recessed groove 74 is formed continuously with the through hole 72 at a position corresponding to the above position, and a screw insertion hole 76 is formed at a position corresponding to the screw hole 64 of the support member 58. Further, between the screw insertion holes 76 of the leaf spring 68, there is formed a through hole 77 into which a caulking projection 84 described later formed in the armature 70 is inserted.

A through hole 78 having a diameter slightly larger than the outer diameter of the cylindrical portion 62 of the support member 58 is formed in the center of the armature 70, and the armature 70 corresponds to the locking hole 60 of the support member 58. A recessed groove 80 for accommodating the cylindrical portion 62 around the locking hole 60 is formed at a position corresponding to the through hole 78, and a head of a screw 86 described later is provided at a position corresponding to the screw insertion hole 76 of the leaf spring 68. Is formed with a concave groove 82. Further, a caulking projection 84 is formed between the concave grooves 82 of the armature 70 at a position corresponding to the through hole 77 of the leaf spring 68.

The leaf spring 68 and the armature 70 configured as described above are the caulking projections 84 of the armature 70.
Are fixed to each other by being inserted into the through hole 77 of the leaf spring 68 and caulking, and the through hole 78 of the armature 70 is secured.
Is fitted into the tubular portion 62 of the support member 58, the plurality of screws 86 are inserted into the screw insertion holes 76 of the leaf spring 68 and screwed into the screw holes 64 of the support member 58, whereby the armature 70 Are fixed to the support member 58. When the armature 70 is attached to the supporting member 58 via the plate spring 68, the caulking portion of the caulking protrusion 84 formed on the supporting member 58 side of the plate spring 68 is housed in the concave groove 66 of the supporting member 58. It is like this.

An exciting coil 88 is fitted to the large diameter portion 37 of the shaft 34 via a coil spring 50 on the surface of the support member 58 on the cover 18 side. This exciting coil 88 is
A through hole 89 having a diameter larger than that of the large diameter portion 37 of the shaft 34 is formed in the center portion, and a coil 94 is wound around a collared bobbin 92 having collars 90 at both ends in the axial direction. The lead wire 96 along the one collar 90 located on the side
Has been pulled out. Further, the exciting coil 88 has a quadrangular shape serving as a locking means that projects radially in a peripheral edge of the one flange 90 located on the cover 18 side and at a position corresponding to the cut 25 of the opening 12 of the housing 16. Protrusion 98
Is formed, and the projection 98 is fixed to the field 20 by closely engaging with the notch 25 of the housing 16.

Further, the one flange 90 of the exciting coil 88 is provided.
On the surface, a groove 100 is formed around the through hole 89, and a part of the bearing 32, which is fitted into the through hole 31 of the cover 18, on the exciting coil 88 side is fitted.

Of the above components, at least the field 20, the shaft 34, the rotor 42, and the armature 70 are made of a magnetic material such as iron-based metal, and the gear 48 is used.
The support member 58 is made of a nonmagnetic material such as resin. In addition, the cover 18 that constitutes the field 20 is provided with the protrusion 24 after the components are arranged in the housing 16.
Is fitted into the notch 22 of the housing 16 and the opening 12
Then, the protrusion 24 is caulked and fixed to the housing 16.

The electromagnetic clutch of the present invention is constructed as described above, and the shaft of the sheet feeding mechanism or the like is fixed by the screw inserted into the shaft 34 and screwed into the screw hole 38, and is formed on the cover 18. In the state where the rotation preventing protrusion 30 is fixed to a fixing member inside a device such as a copying machine and positioned so that the field 20 does not rotate, the gear 46 rotates from an external drive source in the clockwise direction when viewed from the right side of FIG. A rotational force is applied, which causes the rotor 42 to rotate in the same direction.

When the exciting coil 88 is energized, magnetic flux is generated by the exciting coil 88 in the magnetic path indicated by the chain line M formed through the field 20, the shaft 34, and the rotor 42, and the slit is formed in the rotor 42. An attraction force is generated by the leakage magnetic flux of 41. Therefore, the armature 70
Is attracted to the rotor 42 against the elastic force of the leaf spring 68. As a result, the support member 58 and the armature 70 rotate together with the rotor 42, and the support member 58 causes the coil spring 50 to rotate.
Is connected to the shaft 34 by
4 rotates.

Even when the support member 58 and the armature 70 start to rotate, the shaft 34 does not immediately rotate at the same speed as the rotor 42, and the speed is gradually increased until the coil spring 50 is completely wound. Then, when the coil spring 50 is completely wound up, the coil spring 50 rotates at the same speed as the rotor 42. That is, the rotational force applied to the rotor 42 from the external drive source is gently transmitted to the shaft 34 without being rapidly transmitted to the shaft 34 when the shaft 34 starts rotating.

On the other hand, when the excitation coil 88 is de-energized, the magnetic flux disappears, so that the attraction force of the rotor 42 also disappears. As a result, the armature 70 is pulled back toward the support member 58 by the elastic force of the leaf spring 68. As a result, the rotor 42 is separated from the rotor 42. Therefore, the rotation of the shaft 34 is stopped even if the rotor 42 is rotating.

Since the electromagnetic clutch of the present invention is constructed as described above, the step of applying the adhesive for fixing the exciting coil 88 to the field 20 and the step of drying the adhesive are unnecessary, and the electromagnetic clutch can be easily assembled. become. Further, in the above-described embodiment, since the exciting coil 88 is arranged in the opening 12 of the housing 16 forming the field 20, the attaching work of the exciting coil 88 becomes easy. Further, in the above embodiment, the coil spring 50 has the support member 58.
Is used as a connecting means for connecting the shaft 34 to the shaft 34, the shaft 34 does not rotate carelessly even when a rapid rotational force is applied to the gear 46. That is, as in the conventional example shown in FIG. 3, when the coil spring 132 is directly locked from the external drive source to the tubular body 118 to which the rotational force is applied, a sudden rotational force is applied to the gear 120. At this time, the coil spring 132 may be wound tightly and the shaft 116 may be tightened. In such a case, the shaft 116 may be carelessly rotated. However, the configuration of the present invention eliminates such fear at all.

In the above embodiment, the exciting coil 88 is used.
Is arranged on the side of the cover 18 in the field 20, but the exciting coil 88 may be arranged on the side of the bottom portion 14. If you do this, for example,
The flange 90 on the bottom 14 side of the collared bobbin 92 is provided with a locking means formed of a protrusion or the like protruding in the axial direction of the collared bobbin 92, and the bottom 14 is provided with a recessed groove to which the locking means is engaged. It suffices to form a locking means composed of the like.

Further, in the above embodiment, the exciting coil 88
A protrusion 98 as a locking means is formed on the collar 90 of the bobbin 92 with a collar to fix the coil to the field 20. For example, the exciting coil 88 is resin-molded to form a cover, and the cover is formed. It is also possible to form a locking means such as a protrusion.

In the above embodiment, the armature 7 is used.
The support member 58 for attaching 0 is connected to the shaft 34 via the coil spring 50.
It is also possible to crimp 8 and connect it to the shaft 34 by other connecting means such as welding or screwing.

[0039]

As described above, according to the invention of claim 1,
The excitation coil has a protrusion formed on the collar of the bobbin on the housing.
Engages the second notch formed in the
It is fixed to the component housing and the cover is formed on the periphery.
The raised protrusion is engaged with the first notch and crimped.
Since it is fixed to the housing by means of, the electromagnetic clutch can be easily assembled.

According to the invention of claim 2, the armature
Connection to connect the support member to attach the tool to the shaft
External drive because the means consists of coil springs
The rotational force applied to the rotor from the source starts the rotation of the shaft.
Sometimes the torque is gently transmitted to the shaft, and the rotor's torque is
The inconvenience caused by the sudden transmission to the traffic
Camphor it Ru can.

According to the invention of claim 3, the rotor is
It is equipped with a cylindrical body that is rotatably fitted to the shaft.
The end of its barrel along the shaft outside the field.
The drive force transmitting member on the protruding part.
Since it is attached, the driving force transmission member from the external drive source
Easily so that it is Rukoto give a rotational force to the rotor through.

[Brief description of drawings]

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

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

FIG. 3 is a cross-sectional view of a conventional electromagnetic clutch.

[Explanation of symbols]

12 openings 14 bottom 16 housing 18 cover 20 fields 22 notches 25 notches (second locking means) 34 shaft 42 rotor 44 cylinder 46 gears (driving force transmission member) 50 coil spring 58 Support member 68 leaf spring 70 Armature 88 Excitation coil 90 Tsuba 92 Bobbin with collar 98 projections (first locking means)

Claims (3)

(57) [Claims] 1. A bottomed housing having an opening and the housing.
A field consisting of a cover covering the opening, a shaft penetrating the inside of the field and rotatably attached to the field, and arranged on the bottom side in the field.
Is set, a rotor rotatably mounted on the shaft, is connected to the shaft in the field by connecting means, the opening than the rotor within the field
A support member disposed on the mouth side, an armature mounted on the support member via a leaf spring and disposed on the side facing the rotor, and around the shaft in the field, an excitation coil arranged on the side facing the supporting member is a cover side of the inner, the exciting coil, when the winding is wound on the flanged bobbin
A radial direction formed along the circumference of the collar of the bobbin.
The housing has a plurality of protrusions projecting in
First notches formed along the circumferential direction in the opening of the
And the bottom of the first notch.
Has a plurality of second notches and the cover is
The edge is formed at a position corresponding to the first cut.
And a plurality of protrusions formed on the excitation coil, the protrusions engaging the second notch.
It is fixed to the housing by
The protrusion is engaged with the first notch and crimped.
An electromagnetic clutch characterized by being fixed to the housing by doing so. Wherein said connecting means comprises a coil spring, according to claim 1 in which one end of the coil spring is locked to the shaft, the other end of the coil spring is characterized in that it locked to the support member serial mounting of the electromagnetic clutch. 3. The rotor includes a tubular body rotatably fitted to the shaft, and an end portion of the tubular body projects along the shaft to the outside of the field, and the projecting portion projects. The electromagnetic clutch according to claim 2 , wherein a driving force transmission member is attached to the portion.