JPH0727146A - Electromagnetic clutch - Google Patents

Abstract

PURPOSE:To provide an electromagnetic clutch by which magnetic leakage is reduced and adherent torque between an armature and a rotor is heightened by providing a rubber damper which supports the armature so as to be displaceable in the shaft direction to the rotor side and supports the armature and a rotary body to be moved so as to be relatively displaceable in rotation. CONSTITUTION:In an electromagnetic clutch 1, an inside ring 12 and an outside ring 13 are separated magnetically from each other through a magnetic intercepting groove 14, and a connecting member is a transmitting body 15 to transmit rotational torque to an inner hub 7 from an armature 5 through damper rubber in a condition where the inside ring 12 and the outside ring 13 are separated magnetically from each other. Thereby, since there is no need to arrange a wide bridge as usual between the inside ring 12 and the outside ring 13 in order to fix the transmitting body 15, magnetic leakage by the bridge is eliminated, and as a result, adherent torque between the armature 5 and a rotor 4 can be heightened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic clutch for transmitting and interrupting rotary power, and more particularly to an electromagnetic clutch in which an armature is supported by a rotary driven body via a damper rubber. It is suitable for use for interruption.

[0002]

2. Description of the Related Art As an example of an electromagnetic clutch in which a rotary driven body supports an armature via a damper rubber, FIG.
An electromagnetic clutch 100 shown in is known. In this electromagnetic clutch 100, a plurality of rivets 102 (corresponding to a transmission body of the present invention) extending on a side different from the rotor 101 are fixed to an armature 103, and at the same time, the armature 1
A cover 105 that covers the outer periphery of the rivet 102 with a space is fixed to an inner hub 104 (corresponding to the rotary driven body of the present invention) that receives the rotation of 03, and the outer periphery of the rivet 102 and the inner periphery of the cover 105 are elastic. A deformable damper rubber 106 is interposed. Then, when the exciting coil 107 is energized, the collar 108 of the rivet 102 compresses the damper rubber 106 and the armature 103 is attracted to the rotor 101. When the armature 103 is attached to the rotor 101, the rivet 102 compresses the damper rubber 106 to attach the inner hub 104 to the armature 1.
The rotor 101 and the armature 103 are relatively rotationally displaced with respect to No. 03 so as to soften the impact when the rotor 101 and the armature 103 are attached. When the excitation coil 107 is de-energized, the damper rubber 106
Is restored and the armature 103 is separated from the rotor 101.

[0003]

SUMMARY OF THE INVENTION Armature 103
Includes a magnetic blocking groove 111 that magnetically blocks the inner ring 109 and the outer ring 110. The rivet 102 that transmits the rotational torque from the armature 103 to the inner hub 104 is provided near the magnetic blocking groove 111 as shown in FIG.
The width L of the portion that fixes 02 to the armature 103, that is, the bridge 112 that connects the inner ring 109 and the outer ring 110 is wide. Since the width L of the bridge 112 is wide, the inner ring 1
09, the magnetic leakage between the outer ring 110 and the outer ring 110 becomes large, and the adhesion torque between the armature 103 and the rotor 101 is low.

The present invention has been made in view of the above circumstances, and an object thereof is to connect a transmission body extending to a side different from a rotor and fixed to an armature to a rotary driven body via a damper rubber. Even in the case of the electromagnetic clutch provided as described above, the magnetic leakage between the outer ring and the inner ring of the armature is small, and the electromagnetic clutch having a high adhesion torque between the armature and the rotor is provided.

[0005]

In order to achieve the above-mentioned object, an electromagnetic clutch of the present invention includes an electromagnetic coil that generates a magnetic force by energization, a rotor that is driven to rotate, and an inner ring that is arranged on the inner circumference. An outer ring disposed on the outer periphery of the inner ring, and a non-magnetic material transmission body that connects the inner ring and the outer ring with a space therebetween and extends to a side different from the rotor. An armature that is attached to the rotor by a magnetic force generated by a coil and receives the rotation of the rotor, a rotary driven body that rotates integrally with the armature, and an interposition between the transmission body and the rotary driven body. A damper for supporting the armature so as to be axially displaceable toward the rotor side and for supporting the armature and the rotationally driven body so as to be relatively rotationally displaceable. Employing the technical means comprising a rubber.

[0006]

When the electromagnetic coil is energized, the magnetic force generated by the electromagnetic coil attracts the armature to the rotor.
When this armature is sucked by the rotor, the damper force interposed between the armature transmission body and the rotary driven body is axially compressed by the suction force applied to the armature, and the armature is axially displaced toward the rotor side. . When the armature is attached to the rotor, the rotation torque of the rotor is transmitted to the rotary driven body via the armature, the transmission body, and the damper rubber. When the rotation torque of the rotor is transmitted to the transmission body, the damper rubber interposed between the transmission body and the rotary driven body is compressed in the rotational direction, and the armature and the rotary driven body are relatively rotationally displaced, which causes the armature to move. The transmitted rotational torque is relaxed and transmitted to the rotary driven body, and the shock due to the rapid transmission of the rotational torque at the time of attachment is moderated.

[0007]

As described above, in the electromagnetic clutch of the present invention, the member that connects the inner ring and the outer ring is a non-magnetic material transmission member that transmits the rotational torque from the armature to the damper rubber. Therefore, unlike the conventional case, it is not necessary to provide a wide bridge between the inner ring and the outer ring for fixing the transmission body. That is, in the present invention, since there is no bridge in the magnetic blocking groove between the inner ring and the outer ring, magnetic leakage due to the bridge can be eliminated, and as a result, the adhered torque between the armature and the rotor can be increased.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an electromagnetic clutch of the present invention will be described based on an embodiment shown in the drawings. [Structure of First Embodiment] FIGS. 1 to 5 show the first embodiment. FIG. 1 is a sectional view of an electromagnetic clutch attached to a refrigerant compressor of a vehicle refrigeration cycle, and FIG. 2 is an armature and an inner hub. And FIG. 3 is a rear view of the armature and the inner hub. The electromagnetic clutch 1
The electromagnetic coil 3 housed in the stator 2, the rotor 4 rotated by an engine (not shown), the armature 5 attached to the rotor 4 by the magnetic force generated by the electromagnetic coil 3, and the damper rubber 6 attached to the armature 5. And an inner hub 7 (a rotary driven body of the present invention) which is connected through the armature 5 and rotates integrally with the armature 5 to transmit rotational power to a refrigerant compressor (not shown).

The electromagnetic coil 3 is formed by winding a conductive wire coated with an insulating film, is housed in a stator 2 having a U-shaped cross section and is made of a magnetic material such as iron, and is made of a resin material 8 such as epoxy.
It is fixed to the stator 2 by molding. The stator 2 is fixed to a ring-shaped support member 9,
By fixing the supporting member 9 to the housing of the refrigerant compressor, the stator 2 is attached to the refrigerant compressor.

The rotor 4 has a pulley 10 around which a multi-stage V-belt (not shown) is wound, and is rotated by the rotational power of the engine transmitted via the V-belt. The rotor 4 is made of a magnetic material such as iron and has a U-shaped cross section for housing the stator 2. Further, the rotor 4 is provided with a bearing 11 on its inner periphery, and the rotor 4 is rotatably supported by the bearing 11 with respect to the housing of the refrigerant compressor.

The armature 5 is arranged to face the friction surface of the rotor 4 with a gap G, and is attached to the rotor 4 by the magnetic force generated by the electromagnetic coil 3 to receive the rotation of the rotor 4. The armature 5 includes an inner ring 12 made of a magnetic material such as iron arranged on the inner circumference, and an outer ring 13 made of a magnetic material such as iron arranged on the outer circumference of the inner ring 12.
A plurality of (in this embodiment, 3) connecting the inner ring 12 and the outer ring 13 with a magnetic block groove 14 at a predetermined interval.
3) and the transmitter 15. The transmission body 15 is made of a non-magnetic material (for example, a non-magnetic metal material such as stainless steel, an aluminum alloy, a copper alloy, or a non-magnetic resin material such as resin). The transmission body 15 includes an inner ring 12 and an outer ring 13. To prevent magnetic leakage.

As shown in FIG. 4, the transmission body 15 has a small diameter and a rivet portion 15a which is inserted into three rivet holes 5a provided between the inner ring 12 and the outer ring 13. , A medium-diameter rod-shaped portion 15b extending to a side different from the rotor 4 and surrounded by the damper rubber 6, and a large-diameter flange-shaped compression portion 15c that abuts the surface of the damper rubber 6 on the side opposite to the armature 5. Prepare Then, as shown in FIG. 5, the rivet portion 15a inserted into the rivet hole 5a.
By caulking the end of the rivet portion 15b to the rod-shaped portion 15b side, the end portion of the rivet portion 15a is expanded in the radial direction by plastic deformation and becomes a plastic deformable portion 15d provided around the anti-friction surface side of the rivet hole 5a. Or, it is housed in the arc-shaped notch 5b. Thus, by sandwiching the inner ring 12 and the outer ring 13 between the rod-shaped portion 15b and the plastically deformable portion 15d, the transmission body 15 is fixed in the axial direction of the armature 5 and the periphery of the plastically deformable portion 15d. Is the inner ring 1
The transmission body 15 is fixed in the rotation direction of the armature 5 by abutting on the inside of the notch 5 b of the outer ring 13 and the outer ring 2. In addition, the transmission body 15 is assembled to the inner ring 12 and the outer ring 13 in a state where the damper rubber 6 is compressed by the compression portion 15c, and the inner ring 12 and the outer ring 13 are provided with an inner hub 7 via a stopper cushion 16 described later. Press.

The inner hub 7 is connected to the armature 5 via the transmission body 15 and the damper rubber 6 and rotates integrally with the armature 5. This inner hub 7
It is composed of a triangular flange portion 7a and a cylindrical portion 7b that is spline-fitted to the input shaft of the refrigerant compressor. Near the tops of the triangles of the flange portion 7a, three insertion holes 7 for inserting the stopper cushion 16 provided integrally with the damper rubber 6 are inserted.
c is provided. A cylindrical cover 17 that covers the damper rubber 6 is joined around each of the insertion holes 7c by a joining technique such as spot welding.

The damper rubber 6 is an elastically deformable rubber provided between the transmission body 15 and the inner hub 7 or a resin such as plastic (for example, butyl rubber, nitrile rubber, etc.). Is provided in a thick-walled tubular shape having a through hole 6a through which the rod-shaped portion 15b is inserted, and a small-diameter ring-shaped stopper cushion 16 is provided at the end.
Are provided integrally. Then, the stopper cushion 16 is inserted into the three insertion holes 7c provided in the flange portion 7a of the inner hub 7, and the damper rubber 6 is covered with the three covers 17 provided in the flange portion 7a.
The stopper cushion 16 is supported by the inner hub 7. Then, the damper rubber 6 abuts the compression portion 15c of the transmission body 15 on the surface opposite to the armature 5, and the elastic force of the damper rubber 6 causes the armature 5 to move.
It is designed to be displaced away from. And
When the armature 5 is sucked toward the rotor 4 side, the damper rubber 6 is axially compressed by the compression portion 15c of the transmission body 15, and the armature 5 is axially displaced toward the rotor 4 side. Further, when a sudden change in the rotational torque occurs between the armature 5 and the inner hub 7, the damper rubber 6 is compressed in the rotational direction by the rod-shaped portion 15b of the transmission body 15, so that the armature 5 and the inner hub 7 are separated from each other. Rotate relatively.

The stopper cushion 16 protrudes from the insertion hole 7c toward the armature 5 side, and the collar portion 7a.
When the armature 5 is mounted on the rotor 4 and has a predetermined clearance or more,
The distance G between the armature 5 and the rotor 4 is kept at a predetermined gap (for example, 0.5 mm) when the electromagnetic coil 3 is de-energized.

Next, a procedure for assembling the damper rubber 6 to the inner hub 7 will be described. First, the cover 17 is joined around the insertion hole 7c of the inner hub 7 by a joining technique such as spot welding. Next, the damper rubber 6 is inserted into the cover 17, and the stopper cushion 16 is inserted into the insertion hole 7
It is made to project from c to the armature 5 side. After that, as shown in FIG. 4, the rod-shaped portion 15b of the transmission body 15 is inserted into the through hole 6a of the damper rubber 6, and the rivet portion 15 is inserted.
Insert the end of a into the rivet hole 5a, and then crimp the end of the rivet 15a as described above to fix the inner ring 12, the outer ring 13, the transmission body 15, the damper rubber 6 and the inner hub 7. To do.

[Operation of First Embodiment] Next, the operation of the above embodiment will be briefly described. When the energization of the electromagnetic coil 3 is stopped,
Since the armature 5 is held at a position separated from the rotor 4 by the action of the damper rubber 6, the rotational power transmitted from the V belt to the rotor 4 is not transmitted to the armature 5 and the inner hub 7, and only the rotor 4 is transmitted. Spins on the bearing 11. When the electromagnetic coil 3 is energized, a magnetic force is generated in the electromagnetic coil 3 to cause the armature 5 to
A force that is attracted to the rotor 4 is generated. When a force that is attracted to the rotor 4 is generated in the armature 5, the compression portion 15c of the transmission body 15 axially compresses the damper rubber 6 by the suction force applied to the armature 5, and the transmission body 15 is displaced in the axial direction. That is, the armature 5 is axially displaced toward the rotor 4 side. When the armature 5 is attached to the rotor 4, the rotation torque of the rotor 4 is
It is transmitted to the input shaft of the refrigerant compressor via the transmission body 15, the damper rubber 6, and the inner hub 7, and the refrigerant compressor is driven.

When the rotor 4 and the armature 5 are adhered to each other, a sudden change in the rotational torque occurs between the armature 5 and the inner hub 7. Then, due to this abrupt change in the rotational torque, the damper rubber 6 interposed between the transmission body 15 and the inner hub 7 is compressed in the rotational direction, and the armature 5 and the inner hub 7 are relatively rotationally displaced. The rotation torque transmitted to the armature 5 is relaxed and transmitted to the inner hub 7. That is, the electromagnetic clutch 1
It is possible to prevent the impact due to the rapid transmission of the rotational torque during the attachment of the refrigerant, and prevent the impact due to the rapid transmission of the rotational torque from being applied to the refrigerant compressor.

[Effect of First Embodiment] In the electromagnetic clutch 1 of the present embodiment, the inner ring 12 and the outer ring 13 are magnetically completely separated by the magnetic cutoff groove 14, and the inner ring 12 and the inner ring 12 are separated from each other. A member that connects the outer ring 13 in a magnetically separated state transmits a rotational torque from the armature 5 to the inner hub 7 via the damper rubber 6
It is 5. Therefore, unlike the conventional case, it is not necessary to provide a wide bridge between the inner ring 12 and the outer ring 13 for fixing the transmission body 15, so that there is no magnetic leakage due to the bridge, and as a result, the armature 5 and The adhesion torque with the rotor 4 can be increased.

The transmission body 15 has a function of connecting the inner ring 12 and the outer ring 13 in a magnetically separated state, and a function of transmitting a rotational torque from the armature 5 to the inner hub 7 via the damper rubber 6. Since the two functions are combined, it is possible to reduce the number of parts and the number of assembling steps.

[Second Embodiment] FIGS. 6 to 9 show a second embodiment. FIG. 6 is a sectional view of the electromagnetic clutch 1, and FIG.
Is a front view of the armature 5 and the inner hub 7, FIG.
Is a rear view of the armature 5 and the inner hub 7, FIG.
FIG. 4 is a perspective view of a transmission body 15. In this embodiment, the transmitter 15
The outer peripheral surface of the inner ring 12 and the inner peripheral surface of the outer ring 13 at the portion where the rivet portion 15a is inserted are provided with the concavo-convex portion 5c which repeats concavo-convex in the axial direction and the rotating direction of the electromagnetic clutch 1. Then, the transmitter 1 is placed in the uneven portion 5c.
The rivet portion 15a of No. 5 is inserted, the end portion of the rivet portion 15a is pressed against the rod-shaped body side, and the end portion of the rivet portion 15a is plastically deformed, so that the rivet portion 15a bites into the uneven portion 5c. This allows the inner ring 12,
The outer ring 13 and the transmission body 15 are more firmly coupled in the axial direction and the rotation direction.

[Third Embodiment] FIGS. 10 and 13 show a third embodiment.
FIG. 10 is a sectional view of the electromagnetic clutch 1, FIG. 11 is a front view of the armature 5 and the inner hub 7, FIG. 12 is a rear view of the armature 5 and the inner hub 7, and FIG. It is an exploded perspective view. In the present embodiment, the transmission body 15 is made into two bodies, and the rivet portion 15a is provided on the opposite side to the above embodiment. Specifically, the transmission body 15 includes the rod-shaped portion 15b and the compression portion 1.
A cylindrical transmission part 2 having 5c and having a through hole 15e therein.
0 and a flange portion 15f housed in the arcuate cutout 5b are inserted into the through hole 15e of the cylindrical transmission portion 20 from the anti-friction surface side of the armature 5, and the end portion protrudes from the compression portion 15c. The projecting portion (rivet portion 15a) is caulked to form a plastically deformable portion 15d, which is a small-diameter rod-shaped fastener 21.

[Modification] In the above embodiment, the damper rubber is provided in the shape of a thick cylinder, but it may be provided in other shapes such as an ellipse, an oval shape, and a rectangle. Although the example in which the damper rubber is provided without being adhered to the transmitter and the cover is shown, the damper rubber may be adhered and fixed to either the transmitter or the cover, or may be adhered and fixed to both the transmitter and the cover. Is also good. Although the cover for holding the damper rubber in the inner hub (rotation driven body) is provided separately from the inner hub, it may be provided integrally. That is, the rotary driven body may be provided so as to directly hold the damper rubber. Although the example in which the damper rubber and the stopper cushion are provided integrally is shown, they may be provided separately and provided on the inner hub (rotation driven body). By crimping the end of the transmitter,
Although the example in which the inner ring, the outer ring, and the transmission body are fixed is shown, the inner ring, the outer ring, and the transmission body may be fixed by other fixing means such as fastening means for tightening the female screw and the male screw. As a specific example, a female screw is formed in the through hole of the tubular transmission portion of the third embodiment, and a male screw is formed around the fastener to screw the tubular transmission portion and the fastener. Tighten and then stop around.

[Brief description of drawings]

FIG. 1 is a sectional view of an electromagnetic clutch (first embodiment).

FIG. 2 is a front view of an armature and an inner hub (first embodiment).

FIG. 3 is a back view of the armature and the inner hub (first embodiment).

FIG. 4 is a cross-sectional view of an essential part showing a state before plastic deformation of a rivet part of a transmission body (first embodiment).

FIG. 5 is a cross-sectional view of essential parts showing a state after plastic deformation of the rivet part of the transmission body (first embodiment).

FIG. 6 is a sectional view of an electromagnetic clutch (second embodiment).

FIG. 7 is a front view of an armature and an inner hub (second embodiment).

FIG. 8 is a back view of the armature and the inner hub (second embodiment).

FIG. 9 is a perspective view of a transmission body (second embodiment).

FIG. 10 is a sectional view of an electromagnetic clutch (third embodiment).

FIG. 11 is a front view of an armature and an inner hub (third embodiment).

FIG. 12 is a back view of the armature and the inner hub (third embodiment).

FIG. 13 is an exploded perspective view of a transmission body (third embodiment).

FIG. 14 is a cross-sectional view of an electromagnetic clutch (prior art).

FIG. 15 is a rear view of the armature and the inner hub (prior art).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electromagnetic clutch 3 Electromagnetic coil 4 Rotor 5 Armature 6 Damper rubber 7 Inner hub (rotating driven body) 12 Inner ring 13 Outer ring 15 Transmitter

Claims (1)

[Claims] 1. An electromagnetic coil for generating magnetic force by energization, (b) a rotor driven to rotate, (c) an inner ring arranged on the inner circumference, and an outer side arranged on the outer circumference of the inner ring. A ring, and a non-magnetic material transmission body that connects the inner ring and the outer ring with a space therebetween and extends to a different side from the rotor,
An armature that is attached to the rotor by the magnetic force generated by the electromagnetic coil and receives rotation of the rotor; (d) a rotary driven body that rotates integrally with the armature; and (e) the transmission body and the rotary driven body. An electromagnetic clutch that is interposed between the armature and the rotor, and that supports the armature so as to be axially displaceable toward the rotor side and that relatively supports the armature and the rotary driven body so as to be relatively rotationally displaceable. .