JPH10141391A - Electromagnetic clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify an assembly process and shorten assembly time. SOLUTION: In this clutch, a field 20 consisting of a housing 16 with an opening 12 and a bottom part 14, and a cover 18 for covering the opening 12 is fitted with a shaft 34 rotatably in the state of piercing the inside of the field 20. A rector 42 is rotatably fitted to the shaft 34 in the field 20, and a support member 58 is connected by a coil spring 50. An armature 70 is fitted to the support member 58, on the opposed side to the rotor 42 through a plate spring 68, and an exciting coil 88 is disposed on the opposed side to the support member 58. The exciting coil 88 is constituted by winding a coil 94 around a collar bobbin. A radially protruded protrusion 98 is formed at a collar 90 on one side, and this protrusion 98 is engaged with a slot 25 formed at the opening 12 of the housing 16 constituting the field 20.

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 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 paper feeding mechanism or the like of a copying machine, and has a housing 206 having an opening 202 on one surface and a bottom 204 on the other opposite surface, and an opening of the housing 206. There is provided a field 210 composed of a cover 208 covering the 202. The bottom 20 of this field 210
4 has a bearing 2 in a through hole 205 formed in the center thereof.
12 is disposed, and a cover 214 of the field 210 is provided with a bearing 214 in a through hole 209 formed in the center thereof.
Are arranged.

[0003] The field 210 has a bottom 204.
The shaft 216 is rotatably disposed through 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 periphery 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 cylindrical body 218.
0 is fitted.

In the field 210, an exciting coil 224 having a through hole 222 at the center is loosely fitted to a cylindrical body 218 and fixed to the bottom 204 side. In the field 210, a supporting member 226 is rotatably fitted to the shaft 216 at a position adjacent to the exciting coil 224. The supporting member 226 is attached to the cover 208 via an armature via a leaf spring 228. 230 is attached. The support member 226 is integrally connected to the cylinder 218 by a coil spring 232, and is rotatable together with the cylinder 218. 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.

[0005] The electromagnetic clutch constructed as described above
When the cylindrical body 218 rotates around the outer circumference of the shaft 216 due to the rotation of the gear 220 by an external drive source, the support member 226 rotates together with the cylindrical body 218, whereby the armature 230 rotates. Now
When the excitation coil 224 is energized, a magnetic flux is generated by the excitation 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 magnetic flux generated in the slit 234 of the rotor 236 causes the rotor 236 to generate a magnetic flux. 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 rotating the gear 220, and the shaft 216 integrated with the rotor 236 rotates.

On the other hand, when the power supply to the excitation coil 224 is cut off, 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
Side and is 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 by an adhesive, the adhesive applying step and the adhesive Drying process becomes necessary and the assembly process of the electromagnetic clutch becomes complicated,
There is a problem that the assembling time becomes long.

Accordingly, it is an object of the present invention to provide an electromagnetic clutch which can simplify the assembling process and shorten the assembling time and is easy to assemble.

[0009]

According to an aspect of the present invention, there is provided an electromagnetic clutch, comprising: a field; a shaft penetrating through the interior of the field and rotatably mounted in the field; A rotor rotatably mounted on a shaft in the field, a support member connected to the shaft in the field by connecting means, and a support member mounted on the support member via a leaf spring and facing the rotor. An electromagnetic clutch comprising an armature provided and an exciting coil disposed around the shaft in the field and on a side facing the support member, wherein the exciting coil has first locking means. While the field is provided with second locking means, and the first locking means is engaged with the second locking means. More the exciting coil is characterized in that it is fixed to the field.

In the electromagnetic clutch according to the first aspect, a rotational force is applied to the rotor from an external drive source. When the excitation coil is not energized, the shaft is stopped even when the rotor rotates, but when the excitation coil is energized, an attractive 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. Further, as a result of the first locking means being engaged with the second locking means and the exciting coil being fixed to the field, the adhesive applying step and the drying step are not required.

According to a second aspect of the present invention, in the electromagnetic clutch according to the first aspect, the exciting coil is formed by winding a winding around a flanged bobbin. The means is formed on the flange.

In the electromagnetic clutch according to the present invention, the first locking means formed on the flange of the flanged bobbin is engaged with the second locking means formed on the field, so that the exciting coil is connected to the field. Fixed.

According to a third aspect of the present invention, in the electromagnetic clutch according to the second aspect, the field includes a bottomed housing having an opening and a cover that covers the opening. The first locking means is provided on the cover side, the first locking means comprises a protrusion protruding in the radial direction of the flange, and the second locking means comprises a cut formed in an opening of the housing. It is characterized by.

In the electromagnetic clutch according to the third aspect, as a result of the exciting coil being disposed on the cover side of the field, the first locking means can be constituted by a projection projecting in the radial direction of the flange. The second locking means can be constituted by a cut formed in the opening of the housing.

According to a fourth aspect of the present invention, in the electromagnetic clutch according to the first, second or third aspect, the connecting means comprises a coil spring, and one end of the coil spring is locked to the shaft. The other end of the spring is locked to the support member.

In the electromagnetic clutch according to the fourth aspect, when the armature is attracted to the rotor and the support member starts rotating, the rotational force of the support member is transmitted to the shaft via the coil spring, thereby rotating the shaft. I do.

According to a fifth aspect of the present invention, there is provided an electromagnetic clutch according to the fourth aspect, wherein the rotor includes a cylindrical body rotatably fitted to the shaft. A portion protrudes out of the field along the shaft, and a driving force transmitting member is attached to the protruding portion.

In the electromagnetic clutch according to the fifth aspect, the driving force transmitting member attached to the cylindrical portion protruding outside the field is provided with a rotational force from an external driving source, and is applied to the driving force transmitting member. The rotor is rotated by the rotating force.

[0019]

FIG. 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 figures, the electromagnetic clutch includes a cylindrical housing 16 having an opening 12 on one surface and a bottom 14 on the other opposite surface, and a plate-like cover 18 covering the opening 12 of the housing 16. Field 20
It has.

At the periphery of the opening 12 of the housing 16, a plurality (three in the figure) of rectangular cuts 22 are formed at regular intervals in the circumferential direction, and at the periphery of the cover 18,
A rectangular projection 24 is formed at a position corresponding to each cut 22 of the housing 16. The cover 18 has the protrusion 24 fitted in the cutout 22 of the housing 16, is disposed in the opening 12, and is fixed to the housing 16 by caulking the protrusion 24.

At the center of the notch 22 of the housing 16, a square notch 25, which is a locking means for engaging with a projection 98 of the exciting coil 88, which will be described later, extends toward the bottom 14. A concave groove 27 for drawing out a lead wire 96 of an exciting coil 88 to be described later is formed at an appropriate position on the periphery of the opening 12.

A through hole 28 is formed at the center of the bottom portion 14 of the housing 16, and a bearing 29 is fitted into the through hole 28. The through hole 28 has a detent shape having a linear portion in part, and a fitting portion of the bearing 29 to the through hole 28 has a shape matching the through hole 28. The cover 18 is provided with a rotation preventing protrusion 30 protruding in a radial direction on a peripheral edge thereof.
A through hole 31 is formed at the center, and a bearing 32 is fitted into the through hole 31.

The field 20 has a cylindrical shaft 3
4 is rotatably disposed through 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 全長 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. Further, a washer groove 36 is formed on the peripheral surface of the end of the small diameter portion 35. In addition, a flange-shaped stopper 40 is protruded from an intermediate peripheral surface of the large-diameter portion 37, and a paper feed mechanism or the like inserted into the shaft 34 is formed at an end of the large-diameter portion 37. Screw hole 38 for fixing shaft
Are formed.

In the field 20, a disk-shaped rotor 42 having a plurality of (three in the figure) arc-shaped slits 41 on the inner periphery is rotatably mounted on the shaft 34 and disposed on the bottom 14 side. I have. The rotor 42 has, at its center, a tubular body 44 having an outer tubular portion 441 projecting toward the bottom portion 14 of the rotor 42 and an inner tubular portion 442 projecting toward the cover 18 side of the rotor 42. 44 is rotatably fitted to the small diameter portion 35 of the shaft 34.
Further, an outer tubular portion 441 of the tubular body 44 has a part 44 thereof.
1a protrudes to the outside of the field 20 along the peripheral surface of the shaft 34.
A gear 46 as a driving force transmitting member having a through hole 45 at the center is fitted to 41a. A washer 47 is provided at a joint position between the cylindrical body 44 and the large-diameter portion 37 of the shaft 34 in the axial direction so as to make the two slide well. The washer groove 36 of the shaft 34
, A washer 48 is fitted, and the gear 46 is
1a.

The through-hole 45 of the gear 46 has an end portion of the shaft 34 fitted in the center thereof, and a protruding portion 441 of the cylindrical body 44 is fitted to an extended portion 451 formed at an opposing position.
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 when the cylindrical body 44 is fitted to the large-diameter portion 37, both are substantially the same. It is located in the outer peripheral surface.

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

The shaft 34 has a coil spring 50
A plate-shaped supporting member 58 having a through hole 56 having a diameter larger than the outer diameter of the coil spring 50 at the center is fitted on the upper part. A cylindrical portion 62 is formed around the through hole 56 on the surface of the support member 58 on the rotor 42 side. The support member 58 is formed with a locking hole 60 that locks the other end 54 of the coil spring 50 continuously with the through hole 56, and the cylindrical portion 62 surrounds the locking hole 60. Is also extended. A plurality (three in the figure) of screw holes 64 for fixing a leaf spring 68 to be described later are formed at equal intervals in the circumferential direction, and a plurality of (three in the figure) are formed on the periphery of the support member 58. Are formed at equal intervals at positions between the screw holes 64.

A plate-shaped armature 70 is attached to a surface of the support member 58 on the rotor 42 side via a leaf spring 68. That is, a through hole 72 having a diameter larger than the outer diameter of the cylindrical portion 62 of the support member 58 is formed at the center of the leaf spring 68, and the locking hole 60 of the support member 58 is formed.
A concave groove 74 is formed at a position corresponding to the through hole 72 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 are formed through holes 77 through which swaging protrusions 84 formed on the armature 70 to be described later are inserted.

In the armature 70, 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 at the center thereof, and the through hole 78 corresponds to the locking hole 60 of the support member 58. A concave groove 80 is formed at the position corresponding to the through hole 78 to accommodate the cylindrical portion 62 around the locking hole 60, and a head of a screw 86 described later is formed at a position corresponding to the screw insertion hole 76 of the leaf spring 68. Is formed. In addition, between each concave groove 82 of the armature 70, a caulking projection 84 is formed 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 connected to the caulking projection 84 of the armature 70.
Are fixed to each other by being inserted into the through hole 77 of the leaf spring 68 and caulked, and the through hole 78 of the armature 70 is
Are fitted into the cylindrical portion 62 of the support member 58, and a 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, thereby forming the armature 70. Are fixed to the support member 58. When the armature 70 is attached to the support member 58 via the leaf spring 68, the caulked portion of the caulking projection 84 formed on the support member 58 side of the leaf spring 68 is housed in the concave groove 66 of the support member 58. It has become.

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
A winding 94 is wound around a flanged bobbin 92 having a through hole 89 having a diameter larger than the large diameter portion 37 of the shaft 34 at the center, and flanges 90 at both ends in the axial direction. Lead wire 96 along one collar 90 located on the side
Has been pulled out. The exciting coil 88 is a square-shaped locking means that is a locking means that protrudes radially at a position corresponding to the notch 25 of the opening 12 of the housing 16 on the periphery of the one flange 90 located on the cover 18 side. Protrusion 98
The projection 98 is fixed to the field 20 by being closely engaged with the notch 25 of the housing 16.

The one flange 90 of the exciting coil 88
A concave groove 100 is formed on the surface around the through hole 89, and a part of the bearing 32 on the excitation coil 88 side fitted in the through hole 31 of the cover 18 is fitted.

At least the field 20, the shaft 34, the rotor 42, and the armature 70 are made of a magnetic material such as an iron-based metal, and the gear 48
The support member 58 is made of a non-magnetic material such as a resin. The cover 18 constituting the field 20 is provided with a projection 24 after each component is disposed in the housing 16.
Is fitted into the notch 22 of the housing 16 and the opening 12
After that, the projection 24 is caulked and fixed to the housing 16.

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

When the excitation coil 88 is energized, a magnetic flux is generated by the excitation coil 88 in a magnetic path indicated by a chain line M formed between the field 20, the shaft 34, and the rotor 42, and the rotor 42 has a slit. Attraction force is generated by the leakage magnetic flux of 41. Therefore, 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
Is connected to the shaft 34 by the
4 rotates.

Even if 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, but gradually increases until the coil spring 50 is completely wound. When the coil spring 50 is completely wound, it 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 transmitted to the shaft 34 gently at the start of rotation of the shaft 34 without being suddenly transmitted to the shaft 34.

On the other hand, when the power supply to the exciting coil 88 is cut off, the magnetic flux disappears, and the attracting force of the rotor 42 also disappears. As a result, the armature 70 is pulled back to the support member 58 by the elastic force of the leaf spring 68. As a result, it is separated from the rotor 42. Therefore, even if the rotor 42 is rotating, the rotation of the shaft 34 is stopped.

Since the electromagnetic clutch of the present invention is configured as described above, the step of applying an adhesive for fixing the exciting coil 88 to the field 20 and the step of drying the adhesive are not required, and the assembly of the electromagnetic clutch is easy. become. Further, in the above-described embodiment, since the exciting coil 88 is disposed in the opening 12 of the housing 16 forming the field 20, the work of mounting the exciting coil 88 becomes easy. Further, in the above embodiment, the coil spring 50 is connected to the support member 58.
Is used as a connecting means for connecting the shaft 34 to the shaft 34, so that the shaft 34 does not rotate carelessly even when a sudden 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 engaged with the cylinder 118 to which a rotational force is applied from an external driving source, a sudden rotational force is applied to the gear 120. At times, there is a possibility that the coil spring 132 is wound and tightened, and the shaft 116 is tightened. In such a case, the shaft 116 is rotated carelessly. However, such a risk is completely eliminated in the configuration of the present invention.

In the above embodiment, the exciting coil 88
Are arranged on the cover 18 side in the field 20, but the exciting coil 88 may be arranged on the bottom 14 side. In this case, for example,
The flange 90 on the bottom 14 side of the flanged bobbin 92 is provided with a locking means such as a projection projecting in the axial direction of the flanged bobbin 92, and a concave groove in which the locking means is engaged with the bottom 14. What is necessary is just to form the locking means consisting of etc.

In the above embodiment, the excitation coil 88
Is fixed to the field 20 by forming a projection 98 as a locking means on the flange 90 of the flanged bobbin 92. For example, the excitation 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 projection.

In the above embodiment, the armature 7
0 is connected to the shaft 34 via the coil spring 50, but the supporting member 5
8 may be caulked and connected to the shaft 34 by other connecting means such as welding, screwing or the like.

[0042]

As described above, according to the first aspect of the present invention,
A first locking means is formed on the exciting coil disposed in the field, while a second locking means is formed on the field, and the first locking means is engaged with the second locking means. By doing so, the excitation coil is fixed to the field, so that the electromagnetic clutch can be easily assembled.

According to the second aspect of the present invention, the exciting coil is formed by winding a winding around a flanged bobbin, and the first locking means is formed on the flange. Therefore, formation of the locking means is facilitated.

According to the third aspect of the present invention, the field comprises a bottomed housing having an opening and a cover for covering the opening, and the exciting coil is disposed on the cover side. Since the stopping means is formed of a protrusion protruding in the radial direction of the flange, and the second locking means is formed of a cut formed in the opening of the housing, the protrusion of the exciting coil is fitted into the cut of the opening of the housing. Alone, the exciting coil can be fixed to the field, and the electromagnetic clutch can be more easily assembled.

According to the fourth aspect of the present invention, since the connecting means for connecting the support member to which the armature is mounted to the shaft is formed of a coil spring, the rotational force applied to the rotor from an external drive source is reduced. When the rotation of the shaft is started, the torque is gradually transmitted to the shaft, and the inconvenience caused by the rapid transmission of the rotational force of the rotor to the shaft can be eliminated.

According to the fifth aspect of the present invention, the rotor is provided with the cylindrical body rotatably fitted to the shaft, and the end of the cylindrical body extends outside the field along the shaft. Since the driving force transmitting member is attached to the protruding portion, a rotational force can be easily applied to the rotor from an external driving source via the driving force transmitting member.

[Brief description of the 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 sectional view of a conventional electromagnetic clutch.

[Explanation of symbols]

 12 Opening 14 Bottom 16 Housing 18 Cover 20 Field 22 Notch 25 Notch (second locking means) 34 Shaft 42 Rotor 44 Cylindrical body 46 Gear (drive force transmitting member) 50 Coil spring 58 Support member 68 Leaf spring 70 Armature 88 Excitation Coil 90 Flange 92 Flanged bobbin 98 Projection (first locking means)

Claims (5)

[Claims] 1. A field, a shaft penetrating through the interior of the field and rotatably mounted on the field, a rotor rotatably mounted on a shaft in the field, and coupling means in the field by coupling means. A support member connected to the shaft, an armature attached to the support member via a leaf spring, and an armature disposed on a side facing the rotor, and a support member around the shaft in the field; In an electromagnetic clutch comprising an exciting coil disposed on the opposite side, a first locking means is formed on the exciting coil, and a second locking means is formed on the field, First
An electromagnetic clutch, wherein the exciting coil is fixed to the field by engaging the locking means with the second locking means. 2. The exciter coil according to claim 1, wherein a winding is wound around a flanged bobbin, and the first locking means is formed on the flange. Item 7. The electromagnetic clutch according to Item 1. 3. The field comprises a bottomed housing having an opening and a cover covering the opening, the exciting coil is disposed on the cover side, and the first locking means is a flange. 3. The electromagnetic clutch according to claim 2, wherein the second locking means comprises a notch formed in an opening of the housing. 4. The coupling means according to claim 1, wherein one end of the coil spring is locked to the shaft, and the other end of the coil spring is locked to the support member. , 2 or 3. 5. The rotor has a tubular body rotatably fitted to the shaft, and the end of the tubular body projects outside the field along the shaft, and 5. The electromagnetic clutch according to claim 4, wherein a driving force transmitting member is attached to the portion.