JPH0722491Y2 - Electromagnetic coupling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an electromagnetic coupling device, and more particularly, to improvement of a lead wire lead portion of the electromagnetic coupling device.

(Prior Art) Conventionally, an exciting device in an electromagnetic coupling device is composed of an electromagnet device. A conventional electromagnetic coupling device will be briefly described. The electromagnetic coupling device has a cross section fixed by a key or the like to a hollow shaft 1 connected to a driven shaft (not shown) as shown in FIG. 3 (a). A U-shaped rotor 2 is provided, and a gear 3 which receives a driving force of a motor (not shown) or the like is loosely fitted onto the shaft 1 on one side of the rotor 2 so as to be rotatable relative to the shaft. An exciter 4 is arranged on the shaft 1 on the other side of the rotor 2.

An armature 5 is attached to the rotor-side boss portion of the gear 3 through a leaf spring 6, and the armature 5 is magnetically attracted and coupled to the rotor 2 by the magnetic attraction force of the exciting device 4. Reference numeral 7 is a magnetic shielding window formed in the rotor 2 for flowing a magnetic flux from the rotor 2 to the armature 5 when the magnetic attraction force is generated.
The lining is arranged to avoid a reduction in contact area with.

The exciting device 4 comprises an annular yoke 10 that houses an exciting coil 9 wound around a bobbin 8. This annular yoke 10 is loosely rotatably fitted in the large diameter portion 1a of the shaft 1, and the tip of the inner peripheral portion (the right end in FIG. 3A) of the rotor 2 fixed to the small diameter portion 1b. A portion of the magnetic circuit is formed by overhanging and overlapping a slight gap on the boss-shaped inner peripheral portion, and a spacer 11 is provided between the tip surface and the inner surface of the rotor 2 to avoid direct contact. Is intervening. Reference numeral 12 is a lead wire extending from the exciting coil 9, 13 is a pin contact portion connected to the end portion of the lead wire 12, and 14 is a fixed portion in place to prevent the yoke 10 from rotating together when the shaft 1 rotates. The detent protrusion for locking is shown.

The conventional electromagnetic coupling device having such a configuration operates as follows. That is, when the exciting coil 9 of the exciting device 4 is energized, a magnetic flux Φ is generated to form a magnetic circuit as shown in FIG. 3 (a), and the armature 5 resists the elastic force of the leaf spring 6. Then, it is magnetically attracted to the rotor 2. As a result, the rotational force of the drive source (not shown) passes through the gear 3, the leaf spring 6, the armature 5, the rotor 2 and the shaft 1 and the driven shaft (not shown).
And the driven shaft is rotated.

Further, when the exciting coil 9 is deenergized, the magnetic flux Φ disappears, and the armature 5 is separated from the rotor 2 by the elastic force of the leaf spring 6 and faces the gear 3 and the rotor 2 with a gap therebetween.
The connection with is released and the rotational force transmission path is cut off.
When the exciting coil 9 is energized, the yoke 10 is also magnetically attracted to the rotor 2, but it is axially separated by the spacer 11 and the yoke 10 and the rotor 2 are in sliding contact with the spacer 11 to enable relative rotation. .

By the way, the exciting device 4 used in this electromagnetic coupling device is an electromagnet device itself, and the electromagnet device includes a bobbin 8 housed in a yoke 10 and wound with an exciting coil 9. The conventional bobbin 8 is shown in FIG. (B), FIGS. 4 and 5
As shown in the figure, the partition walls 8b and 8c are provided at both ends of the tubular body 8a.
And an intermediate partition wall 8d is formed adjacent to one partition wall 8b and at a slight interval. Of these partition walls, the space 8e around the body section partitioned by the partition walls 8b and 8d is a lead-in winding space, and the partition wall 8
The space 8f around the body section, which is defined by d and 8c, was the winding portion of the exciting coil 9. The lead wire winding space 8e is a partition wall.
The lead-out portion 8g provided on the outer side surface of 8b communicates with the lead-out hole 8h. The lead wire winding space 8e is for increasing the contact resistance with the bobbin 8 when the lead wire 12 is strongly pulled from the outside so as not to exert a tensile force directly on the connecting portion with the exciting coil 9. , The two lead wires 12 introduced into the space 8e from the lead-out hole 8h of the lead-out portion 8g
Are respectively divided in the left-right direction and wound around the body portion 8a by a half circumference. One end of the lead wire 12 is connected to one end of the exciting coil 9 through a hole formed in the partition wall 8d, and the other lead wire is connected. The end portion is connected to the winding end portion which is the other end of the exciting coil 9 by soldering or the like, over the outer peripheral edge of the partition wall 8d.

(Problems to be solved by the invention) As described above, in the conventional electromagnetic coupling device, the bobbin disposed inside the yoke forms a space for winding the lead wire to prevent the lead wire from easily coming off. Because of this, the exciting coil winding part of the bobbin becomes small, and the magnetic attraction force is weak relative to the overall size, and the lead wire extends from the yoke, which makes handling at the time of manufacturing and assembly troublesome. There was a drawback.

An object of the present invention is to provide an electromagnetic coupling device in which the exciting coil winding portion of the bobbin is enlarged and the lead wire is eliminated in view of the conventional drawbacks.

(Means for Solving the Problems) In the electromagnetic coupling device of the present invention, the connector pin is embedded in the collar portion of one end of the bobbin, one end of the connector pin is connected to the exciting coil, and the other end is projected from the yoke. It is characterized by

(Operation) According to the electromagnetic coupling device of the present invention, one end of the connector pin embedded in the collar portion formed at one end of the bobbin is externally exposed through the opening formed in the yoke when the bobbin is housed in the yoke. Is projected to. Further, since the connector pin is formed by being embedded in the collar portion, most of both ends of the bobbin can be used as the exciting coil winding portion, and therefore the coil is wound around the portion. As a result, when the electromagnetic coupling device is used, it is only necessary to insert the connector portion extending from the power source or the control portion into the connector pin protruding from the yoke, and a stronger magnetic attraction force than in the conventional case is generated.

(Embodiment) Hereinafter, the electromagnetic coupling device of the present invention will be described in more detail with reference to a preferred embodiment shown in the accompanying drawings.

FIG. 1 shows an electromagnetic coupling device according to a first embodiment of the present invention. In the structure of this electromagnetic coupling device, the components other than the excitation device are functionally the same as those of the conventional electromagnetic coupling device shown in FIG. 3 (a), and therefore the same reference numerals are given to them. The description is omitted.

Exciting device 20 used in the electromagnetic coupling device shown in FIG.
Includes a yoke 22 having an annular groove portion 21.
The 22 itself is also formed in an annular shape so that a shaft or the like can be inserted through the central portion. A bobbin 23 is housed in the groove portion 21 of the yoke 22, and the bobbin 23 has partition walls 23b, 23c at both ends of a cylindrical body portion 23a.
On one of the partition walls, that is, the flange portion 23b, there is formed a terminal portion 25 in which two connector pins 24 are embedded in the radial direction. One end side of each connector pin 24 is bent at a right angle, and its end portion is partitioned between the partition walls 23b and 23c. At the side of the exciting coil winding portion 26, the winding thickness of the exciting coil (radial height) or less Is exposed in the position. One end of the exciting coil 9 is connected by soldering to one end of one connector pin 24 located near the body portion 23a when the winding portion 26 starts to be wound, and the other end of the winding end is located outside in the radial direction of the bobbin. The other connector pin 24 is soldered and connected to one end.

The upper end of the terminal portion 25 is fitted into the opening provided in the yoke 22 and slightly protrudes to the outside, and the connector pin is inserted from the upper end of the terminal portion 25.
The other end of 24 projects. At the other end of the protruding connector pin, a wiring socket (not shown) extending from a power source unit or a control unit of a copying machine or the like to which the electromagnetic coupling device is attached is inserted and connected.

The bobbin 23 in the above-mentioned excitation device 20 is a connector pin.
It is possible to preform only the terminal portion 25 in which 24 is molded, hold this at a predetermined position of the molding die during bobbin molding, and integrally bond and mold.

According to such an exciting device 20, although the terminal portion 25 becomes slightly thicker than the conventional one end partition wall, since the lead wire winding space can be eliminated, the axial length of the exciting coil winding portion 26 can be increased, As a result, it is possible to generate a magnetic attraction force which is much larger than that of the exciter having the same size as the conventional one.

FIG. 2 shows an electromagnetic coupling device including an exciting device 30 according to a second embodiment of the present invention. The exciting device 30 includes a bobbin 32 formed by integrally extending a terminal portion 31 in the axial direction, and is functionally the same as that of the first embodiment shown in FIG. However, in this exciting device 30, since the terminal portion 31 is formed in the axial direction, the exciting coil winding portion can be made larger than that of the first embodiment.

(Effect of the Invention) As described above, according to the electromagnetic coupling device of the present invention,
The connector pin is embedded in the collar portion of the bobbin, and one end side of this connector pin is exposed at a position equal to or less than the winding thickness of the exciting coil on the side of the exciting coil winding portion and connected to the exciting coil.
By providing the terminal part with the other end protruding from the yoke, the lead wire winding space that was conventionally provided can be eliminated, and the axial length of the coil winding part can be increased, resulting in a very large magnetic attraction force. Can be generated.
Further, according to the electromagnetic coupling device of the present invention, since the end portion of the connector pin on the side of connection with the exciting coil is located at the coil winding portion side or below the winding thickness of the exciting coil, connection between the connector pin and the coil is easy. Moreover, there is no risk of damage to the connection part or disconnection due to external force, etc., and extremely high reliability can be provided.

[Brief description of drawings]

FIG. 1 is a sectional view showing an electromagnetic coupling device according to a first embodiment of the present invention in an upper half of a central axis, and FIG. 2 is an electromagnetic coupling device according to a second embodiment of the present invention. 3 (a) is a sectional view showing the conventional electromagnetic coupling device with its upper half broken, and FIG. 3 (b) is an enlarged view of the electromagnet device of FIG. 3 (a). FIG. 4 is a vertical sectional view of the electromagnetic coupling device taken along line IV-IV in FIG. 3 (b), and FIG. 5 is a perspective view showing a bobbin in the conventional electromagnetic coupling device. 9 ... Excitation coil, 20, 30 ... Excitation device (electromagnet device), 21
… Grooves, 22… Yokes, 23, 32… Bobbins, 24… Connector pins, 25, 31… Terminals, 26… Excitation coil winding parts. The same reference numerals in the drawings include the same or corresponding portions.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliography SHO 54-82264 (JP, U) ACTUAL OPEN 51-144755 (JP, U) ACTUAL OPEN 57-78604 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A bobbin (23) is provided with a yoke (22) accommodating an exciting coil (9) wound around the bobbin (23), and a connector pin (24) is embedded in a collar portion (23b) of the bobbin. A terminal portion (25) formed by exposing one end side of the exciting coil winding portion (26) side to a position equal to or less than the winding thickness of the exciting coil and connecting to the exciting coil, and protruding the other end side from the yoke. An electromagnetic coupling device configured by including.