JP3587707B2 - Electromagnetic coupling device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a micro electromagnetic coupling device used for OA equipment, particularly a copying machine.
[0002]
[Prior art]
FIG. 7 is a partial cross-sectional side view showing a conventionally used electromagnetic coupling device, FIG. 8 is a front view showing an amateur part, and FIG . 9 is a front view showing a spring part.
[0003]
In the figure, 31 is a yoke having a U-shaped cross section, 32 is a coil built in the yoke 31, 33 is a lead wire connected to the coil 32, 34 is a rotor configured to wrap the yoke 31, and 35 is A shaft 36 integral with the rotor 34 is an armature having an air gap g in the axial direction with the rotor 34 and movable in the axial direction . Holes for rivet setting are provided at three places as shown in FIG. 36a.
[0004]
Reference numeral 37 denotes a hub provided with a gear 37a that meshes with a gear (not shown), and is provided rotatably with respect to the shaft 35. Reference numeral 38 denotes a spring, and reference numerals 38a and 38b denote holes provided in the spring 38. The holes 38 are fixed to the armature 36 and the hub 37 by rivets 39, respectively, and usually press the armature 36 toward the non-rotor side. Reference numeral 40 denotes a holder fixed to the yoke 31, and reference numeral 41 denotes a retaining ring provided on the end surface of the shaft 35.
[0005]
The operation of the conventional electromagnetic coupling device configured as described above is as follows.
That is, when a voltage is applied from a power supply (not shown) to the coil 32 via the lead wire 33, a magnetic flux Φ is generated in a magnetic path indicated by a dotted line, and the armature 36 overcomes the elastic force of the spring 38 to the rotor 34 by the attraction force. It is sucked. Accordingly, the power transmitted to the gear 37a in contact with the rotor 34 is transmitted to a load (not shown) via the hub 37, the spring 38, the rotor 34, and the shaft 35. When the voltage is removed from the coil 32, the magnetic flux Φ disappears, the armature 36 returns to the original position by the elastic force of the spring 38, the gap g with the rotor 34 is maintained, and the transmission of power is stopped.
[0006]
[Problems to be solved by the invention]
The conventional electromagnetic coupling device is configured as described above, but when used in a copying machine or the like, it is important that a specified torque can be transmitted from the beginning, and that it can be mass-produced at low cost . Nevertheless, since the conventional need to caulking amateur 36 and the spring 38 by rivets 39, the armature 36 undergoes a deformation, the degree of contact between the rotor 34 is deteriorated, the specified torque is hardly out was there.
[0007]
In the prior art, it is conceivable to use a rectangular spring 43 which is divided as shown in FIG. 10 , but it is time-consuming to assemble because of the division, and it is rather expensive. was there.
[0008]
The present invention has been made to solve the above-described problems , and does not require caulking and fixing the armature, hub, and spring to each other, and keeps the flatness of the friction surface of the armature good . It is an object of the present invention to provide an electromagnetic coupling device that can stabilize torque from an early stage, and that can be easily assembled and manufactured at low cost.
[0009]
[Means for Solving the Problems]
Electrostatic magnetic coupling device comprising a yoke with a built-in coil, and a rotor configured to wrap the yoke, a shaft fixed to the rotor, while being disposed through a space in the rotor in the axial direction in those having an armature axially movable, and a hub which is rotatably mounted on the shaft while supporting the armature through the spring, the slits provided on the inner peripheral portion of the armature, also, the The hub is provided with a protruding cylindrical portion, the outer peripheral portion of the spring is provided with an arm fitted to the amateur slit, and the inner peripheral portion of the spring is provided with a hub press-fitting slit. The spring has a hole into which the protruding cylindrical portion of the hub is inserted.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiment 1 FIG.
FIG. 1 is a partial cross-sectional side view showing an electromagnetic coupling device according to Embodiment 1 of the present invention, FIGS. 2 and 3 are partial cross-sectional views of the electromagnetic coupling device, and FIG. 4 shows an amateur portion of the electromagnetic coupling device. FIG. 5 is a side sectional view showing the amateur part, and FIG. 6 is a front view showing a spring part of the electromagnetic coupling device.
[0011]
In the drawing, 1 is a yoke having a U-shaped cross section, 2 is a coil built in the yoke 1, 3 is a lead wire connected to the coil 2, 4 is a rotor configured to wrap the yoke 1, and 5 is a rotor. A shaft 16 is provided integrally with the rotor 34. An armature 16 is provided with a gap g in the axial direction with the rotor 34, and is movable in the axial direction . A slit 16a is provided on the inner periphery of the armature 16 in FIGS. Shows an example in which three locations are provided along the circumferential direction.
[0012]
17 is a hub provided with a gear 17a meshing with unillustrated gears are rotatably provided for the shaft 5. Reference numeral 17b denotes a cylindrical portion provided at three locations in the circumferential direction on the side facing the amateur 16. Reference numeral 18 denotes a spring. The spring 18 is provided with three arms 18a on the outer peripheral surface, and internally formed with three holes 18b to be inserted into a cylindrical portion 17b provided on the hub 17, thereby transmitting torque. I can do it. Further, three slits 18c are provided on the inner peripheral surface side of the spring 18 along the circumferential direction so that the spring 18 can be pressed into the cylindrical portion 17c of the hub 17. As described above, the spring 18 is interposed between the armature 16 and the hub 17, and normally presses the armature 16 toward the non-rotor side. Reference numeral 10 denotes a holder fixed to the yoke 1, and reference numeral 11 denotes a retaining ring provided on an end surface of the shaft 5.
[0013]
Next, the operation of the electromagnetic coupling device according to the first embodiment will be described.
When a voltage is applied from a power supply (not shown) to the coil 2 via the lead wire 3, a magnetic flux Φ is generated in a magnetic path indicated by a dotted line, and the armature 16 is overcome by the elastic force of the spring 18 and is attracted to the rotor 4 by the attracting force. You. Accordingly, the power transmitted to the gear 17a in contact with the rotor 4 is transmitted to a load (not shown) via the hub 17, the spring 18, the rotor 4, and the shaft 5. When the voltage is removed from the coil 2, the magnetic flux Φ disappears, the armature 16 returns to the original position by the elastic force of the spring 18 , the gap g with the rotor 4 is maintained, and the transmission of power is stopped.
[0014]
According to the first embodiment, the slit 16a of the armature 16 is fitted by inserting the arms 18a of the spring 18 and attach as further press-fitting the spring 18 in the cylindrical portion 17c of the hub 17. This eliminates the need for all conventional caulking and fixing.
[0015]
That is, the arm 16 a presses the armature 16 against the rotor, while the hub 17 and the spring 18 are fixed by press-fitting using the deformation caused by the slit 18 c provided on the inner periphery of the spring 18. I am trying to do it. Further, if the hole 18b of the spring 18 is inserted into the cylindrical portion 17b provided on the hub 17 in order to further improve the reliability, the transmission of torque is ensured. If there is enough torque transmission, the cylindrical portion 17b of the hub 17 can be omitted.
[0016]
As described above, the electromagnetic coupling device according to the third embodiment does not require a rivet and can also eliminate the caulking operation , so that the assembling time can be significantly reduced, and the friction surface of the amateur 16 is not deformed. it is stable product, also eliminates the break-in work, it will be able to significantly less expensive to manufacture.
Although the case where three arms 18a are provided has been described, another number may be used.
[0017]
In the above description, the clutch has been described. However, the same effect can be obtained by fixing either the armature or the rotor and using it as a braking device. Further, the above description has been made for the OA equipment, but the present invention can also be applied to electromagnetic coupling devices and braking devices for general industrial machines.
[0018]
【The invention's effect】
According to electrostatic magnetic coupling device of the present invention, a slit is provided in the inner peripheral portion of the armature, also in the hub while providing the projecting cylindrical portion, the outer peripheral portion of the spring fitted to the armature of the slit The inner arm of the spring is provided with a slit for press-fitting the hub, and the spring is provided with a hole into which the protruding cylindrical portion of the hub is inserted. It is possible to reliably connect these components integrally without caulking and fixing to both. In addition, as the caulking fixation is not required, the assembling time can be significantly reduced. Further, by inserting the projecting tubular portion of the hub into the hole of the spring, torque transmission between the hub and the spring can be performed more reliably, and the torque is stabilized.
[Brief description of the drawings]
1 is a partially sectional side view showing an electromagnetic coupling device definitive to the first embodiment of the present invention.
2 is a partial cross-sectional view of the electromagnetic coupling device definitive to the first embodiment.
3 is a partial cross-sectional view of the electromagnetic coupling device definitive to the first embodiment.
4 is a front view showing the armature portion of the electromagnetic coupling device definitive to the first embodiment.
5 is a side sectional view showing the armature portion of the electromagnetic coupling device definitive to the first embodiment.
6 is a front view showing the spring portion of the electromagnetic coupling device definitive to the first embodiment.
FIG. 7 is a partially sectional side view showing a conventional electromagnetic coupling device.
FIG. 8 is a front view showing an amateur part of a conventional electromagnetic coupling device.
FIG. 9 is a front view showing a spring portion of a conventional electromagnetic coupling device.
FIG. 10 is a front view showing an amateur portion of another conventional electromagnetic coupling device.
[Explanation of symbols]
1 yoke, 2 coils, 4 rotors, 5 shafts, 16 amateurs,
16a slit, 17 hub, 17b cylinder, 17c cylinder,
18 Spring, 18a arm, 18b hole, 18c slit .

Claims (1)

A yoke containing a coil, a rotor configured to wrap the yoke, a shaft fixed to the rotor, an armature that is installed through an air gap with the rotor and is movable in the axial direction, An electromagnetic coupling device having a hub supported rotatably on the shaft while supporting the armature via a spring, wherein a slit is provided in an inner peripheral portion of the armature, and the hub has a protruding cylinder. On the outer periphery of the spring, an arm fitted to the slit of the amateur is provided. On the inner periphery of the spring, a slit for press-fitting the hub is provided. An electromagnetic coupling device having a hole into which a cylindrical portion is inserted.

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