JP2006307945A - Electromagnetic clutch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an excellent electromagnetic clutch capable of preventing abrasion powder caused by slide between an armature and a second rotary shaft being a movable member in engagement relation with the armature from intruding onto a contact face of a rotor and the armature through a through hole formed in the armature. <P>SOLUTION: This electromagnetic clutch 1 is constituted in such a way that it has the armature 5, the rotor 6 arranged by opposing to the armature 5, and an electromagnetic coil for forming a magnetic circuit passing through in the radial direction of the armature 5 and the rotor 6, an engaging part engaged with the second rotary shaft is provided in the armature 5 to engage the armature and the second rotary shaft 3 mutually by the engaging part, and current-carrying to the electromagnetic coil is turned ON/OFF to attract the armature 5 to the rotor 6 magnetically or release the attraction, wherein a covering member 8 for covering the engaging part 51 formed in the armature 5 in a plane manner is provided. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electromagnetic clutch that performs coupling and separation of two rotating shafts arranged on the same axis by the action of electromagnetic force.

  Generally, as a device for interrupting driving force on a driving force transmission path in order to selectively switch between transmission and interruption of power to a conveyance driving roller in various devices, for example, paper conveying means such as an image forming apparatus. An electromagnetic clutch is used.

  Conventionally, in such an electromagnetic clutch, for example, a first rotary shaft composed of an inner shaft or the like, and at least a part of the first rotary shaft are surrounded on the same axis as the first rotary shaft. When engaging and driving a second rotating shaft made of a gear, a coupling, or the like, which is disposed on the outer side of the movable member, the current is passed through the electromagnetic coil to engage with the second rotating shaft. The armature, which is a movable piece, is attracted and pressed with electromagnetic force to a rotor engaged with the first rotating shaft in the rotational direction. Therefore, the armature needs to be configured to be rotatable and to be able to slide in the axial direction with respect to the second rotation shaft in order to make suction and pressure contact with the rotor.

2. Description of the Related Art Conventionally, for example, in an electromagnetic clutch, the armature can be slid in the axial direction with respect to the second rotation shaft as described above, and the second rotation shaft can be rotated together with the second rotation shaft. In some cases, the bent protrusions of the connection fittings that are integrally disposed on the rotary shaft are engaged with the through holes formed in the armature. (For example, refer to Patent Document 1).
JP 2001-349345 A

  However, in the thing of the above-mentioned patent document 1, in order to engage the bending protrusion of a connection metal fitting, it is necessary to form a through-hole in an amateur. As a result, the wear powder generated by sliding between the armature and the second rotating shaft (gear, coupling, etc.) that is a movable member engaged with the armature from the through-hole is generated between the rotor and the armature. There is a problem that it may enter the contact surface of the electromagnetic clutch and reduce the stability of the operation of the electromagnetic clutch.

  The present invention has been made in order to solve the above-described problem, and wear powder generated by sliding between an amateur and a second rotating shaft that is a movable member engaged with the amateur, An object of the present invention is to provide an excellent electromagnetic clutch that prevents a rotor and an amateur from entering a contact surface through a through hole formed in an amateur.

  In order to achieve the above object, in the present invention, a rotatable first rotating shaft and the first rotating shaft are arranged on the same axis and coaxially with the first rotating shaft so as to surround at least a part of the first rotating shaft. The second rotary shaft and the first rotary shaft and the second rotary shaft are arranged coaxially with the first rotary shaft, and the first rotary shaft and the second rotary shaft are magnetized. And an electromagnetic clutch part that releases the attracted state, and the electromagnetic clutch part penetrates in the radial direction of the rotor, an armature that is a movable piece, a rotor disposed facing the amateur, and An electromagnetic coil that forms a magnetic circuit to be engaged, and the armature is provided with an engaging portion that is engaged with the second rotating shaft, and the armature and the second rotating shaft are engaged by the engaging portion. In addition, by turning on / off the energization of the electromagnetic coil, the amateur and the rotor The magnetically adsorbed, or the electromagnetic clutch configured to perform release of the adsorber, the engagement portion formed on the armature, and further comprising a cover member for covering dimensionally.

  According to this structure, since the engaging part formed in the amateur is covered with the covering member, the sliding between the amateur and the second rotating shaft which is a movable member in an engaging relationship with the amateur is performed. The generated wear powder can be prevented from entering the contact surface between the rotor and the amateur through the engaging portion.

  Further, since the ring-shaped covering member may be disposed so as to cover the engaging portion of the amateur, the operation of covering the engaging portion is an extremely simple operation, and the working time can be shortened. In addition, since only one cover member is required, the number of parts can be reduced.

  Here, in the present invention, the covering member is affixed to the amateur in which the engaging portion is formed. According to this configuration, since the covering member can be pasted on the amateur in advance before the amateur is assembled, the pasting work is easy to perform, the assembling work is simplified, and the working time can be further shortened. Is good.

  In the present invention, the covering member is characterized in that an adhesive layer is provided on at least one of the surface facing the armature of the covering member or the surface facing the rotor. According to this structure, the abrasion powder generated by sliding between the armature and the second rotating shaft, which is a movable member engaged with the amateur, is applied to the adhesive layer provided on the covering member. Can adhere. As a result, the wear powder does not float inside the electromagnetic clutch, which is convenient.

  Further, in the present invention, the amateur is formed in a ring shape, has a step portion on a concentric circle inside thereof, has an engaging portion formed in the step portion, and has a covering member in the engaging portion. It is mounted. According to this configuration, since the covering member is integrally attached to the step portion of the amateur, the handling property is improved, and the workability is improved, which is convenient.

  ADVANTAGE OF THE INVENTION According to this invention, it can prevent that abrasion powder penetrate | invades into the contact surface of a rotor and an amateur through the through-hole formed in the amateur.

(Embodiment)
Hereinafter, specific embodiments of the present invention will be described with reference to FIGS. 1 to 3. 1 is a schematic sectional view showing a schematic configuration 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. 1, and FIG. 3 is an enlarged sectional view of a main part of FIG. is there.

  As shown in the figure, the electromagnetic clutch 1 includes a rotatable first rotating shaft 2 and an outer side coaxially with the first rotating shaft 2 so as to surround at least a part of the first rotating shaft 2. The second rotary shaft 3 disposed between the first rotary shaft 2 and the first rotary shaft 2 is installed coaxially with the first rotary shaft 2 between the first rotary shaft 2 and the second rotary shaft 3. An electromagnetic clutch unit 4 that magnetically attracts the second rotating shaft 3 and releases the attracted state is provided.

  The first rotating shaft 2 is composed of, for example, a shaft, and the first rotating shaft 2 is connected to, for example, a driving roller of a sheet conveying unit of an image forming apparatus (not shown). Further, the first rotating shaft 2 is provided with a coupling portion 21 whose outer shape is formed in a polygon, for example, an octagon, and the rotor 6 described later is fitted into the coupling portion 21. In FIG. 2, the first rotary shaft 2 is drawn on the lower right side for the sake of explanation. Is inserted from.

  The second rotating shaft 3 is a movable member, such as a gear or a coupling, and the teeth 3a of the second rotating shaft 3 are, for example, a driving source for driving a driving roller (not shown). The drive gear of the motor is connected. For example, a plurality of protrusions 3 c are provided on the surface 3 b side of the second rotating shaft 3, which faces an armature 5, which will be described later, and an engagement portion 51 made of a through hole, a notch or the like provided in the armature 5. The armature 5 is engaged, and the armature 5 is slidable in the axial direction with respect to the second rotating shaft 3 and is rotated integrally with the second rotating shaft 3 in an engaged state. A gear receiver 31 is rotatably fitted to the second rotating shaft 3 so as to be slidable in the axial direction. The gear receiver 31 is provided with claw portions 32 and 33, and the claw portions 32 and 33 are engaged so that the second rotating shaft 3, the armature 5, and the gear receiver 31 rotate integrally. ing.

  The electromagnetic clutch unit 4 includes an armature 5 that is a movable piece, a rotor 6 that is disposed facing the armature 5, and an electromagnetic coil 7 that forms a magnetic circuit L that penetrates the rotor 6 in the radial direction (in FIG. 2). (Not shown) and a separation spring 41 interposed between the armature 5 and the rotor 6. The separation spring 41 is composed of, for example, a disc spring or the like, and is interposed between the vertical surface of the amateur 5 and the bottom 66 of the rotor 6 in order to maintain an appropriate gap, and the armature 5 is separated from the rotor 6. It is comprised so that it may bias. The armature 5 and the rotor 6 are magnetically attracted or released by turning ON / OFF the energization of the electromagnetic coil 7 from a power source (not shown). With this configuration, the second rotating shaft 3 and the first rotating shaft 2 are coupled and disconnected.

The amateur 5 is formed in, for example, a ring shape, and an engagement portion 51 made of a through hole, a notch, or the like is formed in the radial direction to which the projection 3c of the second rotation shaft 3 described above is engaged. .
The rotor 6 is made of a magnetic material, and has, for example, a cylindrical outer cylinder portion 65, a bottom 66 on the surface facing the armature 5, and an inner cylinder portion 67, and has a U-shaped cross section. . And the inner surface of the inner cylinder part 67 is formed in the polygon, for example, an octagon. With this configuration, when the rotor 6 is fitted into the first rotating shaft 2, the rotor 6 can slide in the axial direction with respect to the first rotating shaft 2, and the first rotation in the circumferential direction. The coupling portion 21 formed in the octagon of the shaft 2 and the inner surface formed in the octagon of the inner cylinder portion 67 are fitted, and the first rotating shaft 2 and the rotor 6 rotate integrally. In addition, a magnetic path detour portion 61 including a through hole is formed on the bottom 66 in order to divert the magnetic circuit in the radial direction, thereby facilitating the formation of the magnetic circuit L passing between the rotor 6 and the amateur 5. Is configured to do.

  The electromagnetic coil 7 is disposed in an internal space region of the rotor 6 and is fixed to an exterior (not shown) (for example, also serving as a yoke). The armature 5 is magnetically attracted to the rotor 6 against this, and the magnetic attraction is cut off by turning off the energization, and the armature 5 is separated from the rotor 6 by the spring force of the separation spring 41. And an appropriate gap is maintained between the rotor 6 and the rotor 6.

  Next, a specific configuration for covering the engaging portion according to the characteristic portion of the present invention in a planar manner will be described with reference to FIGS. 4 and 5 and FIGS. 4 is a schematic plan view showing the relationship between the amateur shown in FIG. 1 and the protrusions of the second rotation shaft, and FIG. 5 is a schematic plan view showing the relationship between the amateur shown in FIG. 1 and the covering member.

  In the present embodiment, as shown in FIG. 4, for example, the armature 5 formed in a ring shape has a step portion 55 on a concentric circle inside, and the step portion 55 has a through hole and a cut as described above. A plurality of engaging portions 51 each having a notch are formed. Then, as shown in FIG. 5, for example, a ring-shaped covering member 8 made of a synthetic resin or the like that is a nonmagnetic material is mounted so as to cover the engaging portion 51 in a plan view. Thus, it is convenient to attach the covering member 8 integrally to the amateur 5 because the handling at the time of assembly is improved.

  Moreover, you may make it cover the cover member 8 to the amateur 5 using an adhesive agent, for example. According to this configuration, the covering member 8 can be attached to the amateur 5 in advance before the amateur 5 is assembled. As a result, it is easy to perform the pasting work, and the assembling work is simplified, and the working time can be further shortened, which is convenient.

  Further, the covering member 8 imparts adhesiveness to at least one surface of the covering member 8 that faces the armature 5 or the surface that faces the rotor 6, in the illustrated example, the surface that faces the armature 5. Is provided with an adhesive layer. According to this configuration, wear powder generated by sliding between the armature 5 and the second rotating shaft 3 that is a movable member engaged with the armature 5 is applied to the adhesive layer provided on the covering member 8. Can adhere. As a result, the wear powder does not float inside the electromagnetic clutch 1, which is convenient. The adhesive layer is provided, for example, with an adhesive layer on the entire surface of the covering member 8 facing the amateur 5, and the covering member 8 is attached to the amateur 5 with this adhesive layer. In this way, the adhesive layer such as the portion of the adhesive layer that does not adhere to the armature 5, that is, the portion corresponding to the engaging portion 51 consisting of the through hole and the notch, is removed from the adhesive layer. Since it can utilize as an adhesion layer to adhere, it is convenient.

  Further, since the engaging portion 51 is planarly covered by the covering member 8, as described above, at least a part of the engaging portion 51 formed on the armature 5 can be a notch. Accordingly, the engaging portion 51 is not limited to a through hole, and can be a notch. Therefore, when designing the engaging portion 51, the degree of freedom is increased and a more effective engaging portion 51 can be designed. .

  According to the present embodiment having the above-described configuration, the engaging portion 51 formed on the amateur 5 is covered by the covering member 8, so that the second rotation that is a movable member that is engaged with the amateur 5 and the amateur 5 is provided. Wear powder generated by sliding between the shaft 3 and the engaging portion 51 can be prevented from entering the contact surface between the rotor 6 and the amateur 5.

  Moreover, since the cover member 8 should just be arrange | positioned so that the engaging part 51 of the amateur 5 may be covered, the operation | work which covers the engaging part 51 of the amateur 5 becomes a very simple operation | work, and can shorten working time. In addition, since only one cover member 8 is required, the number of parts can be reduced.

The above-described embodiment is a preferred embodiment of the present invention, but the present invention is not limited to this, and various modifications can be made without departing from the gist of the present invention.
For example, in the above-described embodiment, the pressure-sensitive adhesive layer is provided on the surface facing the armature 5 of the ring-shaped covering member 8. However, the surface facing the rotor 6 or both surfaces are made sticky. Of course, the applied adhesive layer may be provided.

In the above-described embodiment, a synthetic resin that is a non-magnetic material is used as the covering member 8, but it is needless to say that a magnetic material may be used.
Further, the magnetic path bypassing portion 61 of the rotor 6 is also covered separately with, for example, a ring-shaped covering member and passed through the magnetic path bypassing portion 61, and the above-described wear powder, and further, the rotor 6 and the amateur 5 are covered. Of course, it is possible to prevent wear powder and dust generated by sliding on the friction surface between the rotor 6 and the electromagnetic coil 7 from entering the rotor 6 and the electromagnetic coil 7.

  As an application example of the present invention, there is an electromagnetic clutch that performs coupling and separation of two rotating shafts arranged on the same axis by the action of electromagnetic force.

It is a schematic sectional drawing which shows schematic structure of the electromagnetic clutch which concerns on embodiment of this invention. It is a disassembled perspective view of the electromagnetic clutch shown in FIG. It is a principal part expanded sectional view of FIG. It is a schematic plan view which shows the relationship between the amateur shown in FIG. 1, and the protrusion of the 2nd rotating shaft. It is a schematic plan view which shows the relationship between the amateur shown in FIG. 1, and a covering member.

Explanation of symbols

L ... Magnetic circuit, 1 ... Electromagnetic clutch, 2 ... 1st rotating shaft, 3 ... 2nd rotating shaft, 4 ... Electromagnetic clutch part, 5 ... Amateur, 6 ... Rotor, 7 ... Electromagnetic coil, 8 ... Cover member, 51 ... engaging part, 55 ... step part, 61 ... magnetic path detour part

Claims (4)

A rotatable first rotating shaft; a second rotating shaft coaxially with the first rotating shaft; and disposed on the outer side so as to surround at least a part of the first rotating shaft; Between the first rotating shaft and the second rotating shaft, which is incorporated coaxially with the first rotating shaft, and magnetically attracts the first rotating shaft and the second rotating shaft; An electromagnetic clutch portion for releasing the attracted state, the electromagnetic clutch portion being an armature that is a movable piece, a rotor disposed to face the armature, and a magnet that penetrates in a radial direction of the rotor. An electromagnetic coil that forms a circuit, and the armature is provided with an engaging portion that is engaged with the second rotating shaft, and the armature and the second rotating shaft are engaged by the engaging portion. And turning on / off the current to the electromagnetic coil. The armature and magnetically adsorbed and the rotor, or an electromagnetic clutch that is configured to perform the release of the adsorber,
The electromagnetic clutch further comprising a covering member that covers the engaging portion formed on the amateur in a planar manner.   The electromagnetic clutch according to claim 1, wherein the covering member is affixed to the amateur.   The electromagnetic wave according to claim 1 or 2, wherein the covering member is provided with an adhesive layer on at least one surface of the covering member facing the amateur or the surface facing the rotor. clutch.   The amateur is formed in a ring shape, has a step portion on a concentric circle inside, the engagement portion is formed in the step portion, and the covering member is attached to the engagement portion. The electromagnetic clutch according to any one of claims 1 to 3, wherein:

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