JPH06341467A - Electromagnetic coupling device - Google Patents

Abstract

PURPOSE:To provide an electromagnetic coupling device which is less expensive and excellent in productivity and reliability by material reduction and machining simplification of a rotor. CONSTITUTION:This device has a driven side shaft 1, a driving rotating member 3 fit on the shaft 1 free to rotate and an opening part to open in the shaft direction. Additionally, it has a cylindrical rotor 2 fixed at least in the rotational direction on the front shaft 1, a yoke 4 arranged free to rotate on the shaft 1 at the opening part of the rotor 2 to connect and control the driving rotating member 3 and the rotor 2 and a bobbin 5 exisiting inside of the rotor 2, arranged free to rotate on the shaft as the yoke 4 and having an exciting coil wound around it. Additionally, it is furnished with a resin cover 11 put over the bobbin 5 to insulate the exciting coil 6 and fit free to rotate on the shaft 1. On this resin cover 11, a sliding support part 11a to support the opening part of the rotor free to rotate is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved electromagnetic coupling device.

[0002]

2. Description of the Related Art A conventional electromagnetic coupling device of this type will be described with reference to FIG. In the figure, 1 is a hollow shaft connected to a driven shaft (not shown) at a D-cut portion 1a, 2 is a cross section L fixed to the shaft 1 by a key portion 2a and a boss portion 2b, and rotating with the shaft 1. The character-shaped rotor, 2c is a magnetic shielding window formed on the side wall of the rotor 2, 2d is a cylindrical portion forming a magnetic circuit, and 3 is adjacent to the rotor 2 and is loosely fitted to the shaft 1 so as to be relatively rotatable. The drive rotation member 3a is a hub portion of the drive rotation member 3, 3b is a gear formed on the outer peripheral surface of the hub portion 3a and receives a driving force from a drive source (not shown), 3c is the rotor 2 and the gap g. Hub part 3a
Is an amateur attached to the end surface of the plate through a leaf spring 3d.

Reference numeral 4 denotes a yoke which is loosely rotatably fitted to the shaft 1 in the opening of the rotor 2 to form a magnetic circuit, and 5 is arranged inside the rotor 2 so as to be rotatable on the shaft 1 and an exciting coil 6 is provided. Is a bobbin wound around the exciting coil 6, 7 is a tape wound around the outer periphery of the exciting coil 6 to insulate and protect it, 8 is a lead wire extending from the exciting coil 6 and drawn out from the hole 4a of the yoke 4, 9 is a lead wire 8 A grommet 10 for protecting the drive ring 10 is a retaining ring mounted on the shaft 1 so as not to move the drive rotation member 3 in the axial direction. The shaft 1 and the yoke 4 are made of an oil-impregnated sintered material so that they can rotate relative to each other. Reference numeral 4b in the figure denotes a holder portion provided to prevent the yoke 4 from rotating along with the rotation of the shaft 1 and to engage with the fixed portion in place.

The conventional electromagnetic coupling device having such a structure operates as follows. That is, when the exciting coil 6 is energized, a magnetic flux Φ is generated as shown by the dotted line in the figure to form a magnetic circuit, and the armature 3c is magnetically attracted to the rotor 2 against the elastic force of the leaf spring 3d. . As a result, the rotational force of the drive source (not shown) is applied to the gear 3b, the hub 3a, the leaf spring 3
It is transmitted to a driven shaft (not shown) via d, the armature 3c, the rotor 2 and the shaft 1, and the driven shaft is rotated. Further, when the exciting coil 6 is deenergized, the magnetic flux Φ disappears, and the armature 3c is separated from the rotor 2 by the elastic force of the leaf spring 3d and faces the gap while holding the gap g, so that the drive rotating member 3 and the rotor 2 are connected. Is released and the rotational force transmission path is cut off.

[0005]

Since the conventional electromagnetic coupling device is constructed as described above, it is necessary to provide the boss portion 2b on the inner circumference of the rotor 2 in order to prevent the rotor 2 from sagging. There was a problem that it was inferior and expensive. Further, since the tape 7 is wound to insulate and protect the outer circumference of the exciting coil 6, workability is poor, and the tape 7 may be peeled off and wound around the rotor 2, resulting in poor rotation.

The present invention has been made to solve the above problems, and an object thereof is to obtain an electromagnetic coupling device which is inexpensive and excellent in productivity and reliability by reducing the material of the rotor and facilitating the processing. And

[0007]

In the electromagnetic coupling device according to the present invention, the opening of the rotor is supported so that the rotor can rotate.

[0008]

In the present invention, since the opening of the rotor is supported so that the rotor can rotate, the rotor can be prevented from sagging. In addition, a boss for preventing sagging is unnecessary.

[0009]

【Example】

Example 1. An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a sectional view in the axial direction, and FIG. 2 is a view of the resin cover of FIG. 1 as viewed from the left. In the figure, reference numeral 11 denotes a cylindrical resin cover which covers the bobbin 5 so as to insulate the outer periphery of the exciting coil 6 and which is loosely fitted to the shaft 1 so as to be rotatable relative to the shaft 1 via a disk portion 11c. A metal part which is integrally formed on the resin cover 11 and rotatably supports the opening of the rotor 2, and a grommet part 11b integrally formed on the resin cover 11 and inserted into the hole 4a of the yoke 4. Is.

Thus, the metal portion 11 of the resin cover 11
If the opening of the rotor 2 is supported by a, the rotor 2
Since the sagging can be prevented, it is not necessary to provide the boss portion 2b on the rotor 2, and it is possible to obtain an inexpensive product having excellent productivity and reliability by reducing the material of the rotor 2 and facilitating the processing.

Further, when the resin cover 11 is provided in this manner, the exciting coil 6 can be insulated by the resin cover 11, so that the insulating tape 7 is not required, resulting in poor workability.
Insulation defects due to work mistakes and rotation defects due to tape winding around the shaft are eliminated.

Further, when the grommet portion 11b is integrally formed with the resin cover 11 as described above, the grommet 9 which is a separate component is not required, so that the cost can be reduced.

Example 2. In the first embodiment, the exciting coil 6
Although the metal cover 11a and the grommet part 11b are integrally formed on the resin cover 11 that insulates the resin cover 11, the resin cover 11 without the grommet part 11b may be used.

Example 3. In the first and second embodiments described above, the metal portion 11a of the resin cover 11 supports the U-shaped opening of the rotor 2, but other members other than the resin cover 11, such as the yoke 4, open the rotor 2. You may make it support a part.

[0015]

As described above, according to the present invention, it is possible to obtain an inexpensive electromagnetic coupling device having excellent productivity and reliability by reducing the material of the rotor and facilitating the processing.

[Brief description of drawings]

FIG. 1 is an axial sectional view showing an embodiment of the present invention.

FIG. 2 is a view of the resin cover of FIG. 1 as viewed from the left.

FIG. 3 is an axial sectional view showing a conventional device.

[Explanation of symbols]

 1 axis 2 rotor 3 drive rotating member 4 yoke 5 bobbin 6 exciting coil 11 resin cover 11a metal part 11b grommet part

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[Procedure amendment]

[Submission date] November 29, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 1

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

[0007]

An electromagnetic coupling device according to the present invention supports a cylindrical portion of a rotor so that the rotor can rotate without providing a boss portion .

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

[0008]

In the present invention, the tubular portion of the rotor is supported.
Since the opening of the rotor is supported so that the rotor can rotate, the rotor can be prevented from sagging. In addition, a boss for preventing sagging is unnecessary.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

Further, when the resin cover 11 is provided in this manner, the exciting coil 6 can be insulated by the resin cover 11, so that the insulating tape 7 is not required, resulting in poor workability.
Insulation defects due to work mistakes and rotation defects due to winding of the tape around the rotor 2 are eliminated.

Claims (3)

[Claims] 1. A cylindrical shape having a driven side shaft, a drive rotating member rotatably fitted to the shaft, an opening opening in the axial direction, and fixed to the shaft at least in the rotational direction. A rotor, a yoke rotatably arranged on the shaft at the opening for controlling connection between the drive rotation member and the rotor, and rotatable on the shaft in the same manner as the yoke inside the rotor. And a bobbin around which an exciting coil is wound, wherein the opening of the rotor is supported so that the rotor can rotate. 2. A cylindrical shape having a driven side shaft, a drive rotating member rotatably fitted to the shaft, an opening opening in the axial direction, and fixed to the shaft at least in the rotational direction. A rotor, a yoke rotatably arranged on the shaft at the opening for controlling connection between the drive rotation member and the rotor, and rotatable on the shaft in the same manner as the yoke inside the rotor. And a bobbin around which the exciting coil is wound, comprising a resin cover that covers the bobbin so as to insulate the exciting coil and is rotatably fitted to the shaft.
An electromagnetic coupling device characterized in that a sliding support portion that rotatably supports the opening portion of the rotor is provided on the resin cover. 3. The electromagnetic coupling device according to claim 2, wherein a grommet portion for protecting the lead wire extending from the exciting coil is formed integrally with the resin cover.