JP2020085173A - Electromagnetic clutch - Google Patents

Abstract

To provide an electromagnetic clutch which is prevented in the generation of a short-circuit between a coil accommodation holder and itself due to the come-off of wiring from a holding state to an internal peripheral side of a cylinder part of a bobbin when the wiring connected to a temperature fuse at one end and connected to a connector at the other end is cabled through the internal peripheral side of the cylinder part of the bobbin.SOLUTION: A salient part 27 extending to a flange 15c side from a flange 15b side of a bobbin 15 while protruding to a radial direction of a cylinder part 15a is formed at an internal peripheral side of the cylinder part 15a of the bobbin 15, a cylindrical passage 28 is formed at the salient part 27, and a fuse wire 19 which is connected to a fuse 17 at one end and connected to wiring 34 via a connector at the other end is made to pass the cylindrical passage 28, thus preventing that the fuse wire 19 from coming off from a state of being held to an internal periphery of the cylinder part 15a of the bobbin 15.SELECTED DRAWING: Figure 3

Description

The present invention relates to an electromagnetic clutch of a compressor that constitutes, for example, a refrigeration cycle of a vehicle air conditioner, and particularly to a structure of a bobbin of the electromagnetic clutch and a structure of winding an exciting coil around the bobbin.

In the conventional electromagnetic clutch, for example, as shown in FIG. 6, the winding start portion S of the exciting coil 100 is located on the flange 105b side where the thermal fuse 106 of the bobbin 105 is not arranged. Therefore, as shown in FIG. 6A, in order to connect the connecting portion 101 at the tip of the winding start portion S of the exciting coil 100 to one of the fuse wires 107 of the two fuse wires connected to the thermal fuse. Need to have a transition portion 101a that extends between the flanges 105a and 105b of the bobbin 105 on the outer peripheral side of the winding portion A of the exciting coil 100. Further, as shown in FIG. 6B, in order to connect the other fuse wire 108 to the connector 109 arranged on the flange 105b side as well, the bobbin is located on the outer peripheral side of the winding portion A of the exciting coil 100. It was necessary to have a transition portion 108a that extends between the flanges 105a and 105b of 105.

When such a transition portion of the excitation coil or a transition portion of the fuse wire is arranged on the outer peripheral side of the winding portion of the excitation coil, a predetermined clearance is provided between the bobbin and the iron coil accommodation holder that accommodates the bobbin. Even if it is left open, there is a possibility that a short circuit may occur between the crossover part of the exciting coil or the crossover part of the fuse wire and the coil housing holder.

In the electromagnetic clutch disclosed in Patent Document 1, a thermal fuse is arranged as shown in FIG. 7 of the present application in order to eliminate the crossover portion of the exciting coil that extends beyond the winding portion of the exciting coil. The winding start portion S of the exciting coil 100 is located on the side of the flange 105b that is not formed, and the winding end portion E of the exciting coil 100 is located on the side of the flange 105a on which the thermal fuse is arranged. The connecting portion 102 at the tip of the portion E is pulled out from the slit 110 formed in the flange 105a to the outer surface of the flange 105a so as to be connected to the fuse wire 107.

Further, in the electromagnetic clutch disclosed in Patent Document 1, in order to eliminate the crossover portion of the fuse wire that crosses the outer peripheral side of the winding portion of the exciting coil, the fuse wire has a protruding shape formed on the inner peripheral surface of the bobbin. I am trying to pass through the groove of the part.

JP, 2016-98896, A

However, in the electromagnetic clutch of Patent Document 1, as shown in FIG. 7, the connecting portion 101 at the tip of the winding start portion S of the exciting coil 100 and the connector 109 are connected, but in this case, For example, it is necessary to provide the through hole 111 in the flange 105b of the bobbin 105, draw out the connecting portion 101 of the exciting coil 100 from the through hole 111, and then draw it around the outer surface of the flange 105b.

Further, in the electromagnetic clutch of Patent Document 1, since the fuse wire is mounted in the groove portion of the protruding portion that opens toward the center of the bobbin, the fuse wire is disengaged from the groove portion of the protruding portion and short-circuited with the coil housing holder. May occur.

The present invention has been made to solve the above-mentioned problems, and when one of the wirings is connected to a thermal fuse and the other is connected to a connector, when the wiring passes through the inner peripheral side of the cylindrical portion of the bobbin, the wiring is The bobbin's cylindrical part is out of the holding state on the inner peripheral side, causing a short circuit with the coil housing holder, or the exciting coil connecting part that connects to the wiring that supplies electricity to the exciting coil is the outer surface of the bobbin flange. It is intended to provide an electromagnetic clutch that is prevented from being pulled around.

In order to achieve the above object, the electromagnetic clutch according to claim 1 is an electromagnetic clutch for transmitting or interrupting rotary power from a rotary power source to the compressor, the magnetic clutch being formed of a magnetic material. A pulley that is rotatably supported with respect to a rotating shaft and that is rotated by receiving a rotating force from the rotating power source, a hub that is connected to the rotating shaft of the compressor, and a magnetic material. An armature plate, which is connected to a hub and is arranged to face the side end surface of the pulley, is energized to form a magnetic circuit passing through the pulley and the armature plate to form the armature plate on the pulley. An exciting coil for generating an attractive force to be electromagnetically attracted, first and second connectors for connecting to a wire for supplying electricity to the exciting coil, a cylindrical portion, and first and second connectors formed at both ends of the cylindrical portion. A bobbin, which is composed of a second flange, is wound around the outer peripheral surface of the cylindrical portion sandwiched by the two flanges, and the first flange is provided with a sensed temperature. Temperature fuse that shuts off the energization to the exciting coil when the temperature exceeds the temperature, and a first wiring that connects the opposite side of the exciting coil to the side connected to the first connector and the thermal fuse. And an inner side of the cylindrical portion of the bobbin in an electromagnetic clutch including a second wire connecting the second connector and a side opposite to the side of the thermal fuse connected to the first wire. On the side, a projecting portion is formed which projects from the first flange side to the second flange side while projecting in the radial direction of the cylindrical portion, and the projecting portion extends in the extending direction of the projecting portion. Is provided with a tubular passage opened on both sides of the second wiring, and the second wiring is passed through the tubular passage. The second wire is, for example, a wire such as a fuse wire whose one end is fixed to the temperature fuse, but may be a wire for relay connected to the wire such as the fuse wire via a connector. That is, the second wiring includes not only the wiring directly connected to the thermal fuse but also the wiring indirectly connected to the thermal fuse. The compressor is, for example, a compressor that constitutes a refrigeration cycle of an air conditioning system for a vehicle and compresses a refrigerant.

Thereby, when the second wiring is passed from the first flange side of the bobbin toward the second flange side via the inner peripheral side of the cylindrical portion, the second wiring is connected to the cylinder of the protruding portion. Can be passed through a corrugated passage. For this reason, the second wiring is connected to the thermal fuse without removing the crossing portion that crosses the outer peripheral side of the winding portion of the exciting coil, and further without being disengaged from the held state of the cylindrical portion of the bobbin. It is possible.

The electromagnetic clutch according to a second aspect of the invention is characterized in that the protruding portion formed on the inner peripheral side of the cylindrical portion of the bobbin is a positioning rib for the bobbin.

Accordingly, since the tubular passage can be used for the positioning rib already provided on the inner peripheral side of the bobbin, it is possible to suppress an increase in cost due to applying the present invention to the bobbin.

In the electromagnetic clutch according to claim 3, in the exciting coil, a winding start portion having a connecting portion with the first wiring at a tip is on the first flange side, and the exciting coil is connected to the first connector. Is wound around the cylindrical portion of the bobbin so that the winding end portion having the connecting portion at the tip is on the side of the second flange.

Thus, a slit can be provided at a position corresponding to the winding start portion of the exciting coil of the first flange, and the connecting portion at the tip of the winding start portion of the exciting coil can be pulled out from the slit to the outer surface of the first flange. . For this reason, it is possible to connect the first coil to the first wiring in such a manner that the connecting portion at the tip of the winding start portion of the exciting coil does not have the crossing portion extending from the winding portion of the exciting coil to the outer peripheral side.
Further, the connecting portion of the exciting coil with the first connector can be pulled out from the outer side in the radial direction of the second flange to the side opposite to the first flange. Therefore, it is possible to connect the connecting portion of the exciting coil with the first connector to the first connector without being routed by the outer surface of the second flange of the bobbin.

As described above, according to the present invention, when the second wiring is passed from the first flange side of the bobbin toward the second flange side through the inner peripheral side of the cylindrical portion, The second wiring can be passed through the cylindrical passage of the protrusion. For this reason, the second wiring should be connected to the thermal fuse without removing the crossover portion that crosses the outer peripheral side of the winding portion of the exciting coil, and without being disengaged from the held state of the cylindrical portion of the bobbin. Is possible. Therefore, it is possible to prevent a short circuit from occurring between the second wiring and the coil housing holder.

In particular, according to the invention as set forth in claim 3, a slit is provided at a position corresponding to the winding start portion of the exciting coil of the first flange, and the connecting portion at the tip of the slit from the winding start portion of the exciting coil is connected to the slit. 1 can be pulled out to the outer surface of the flange. For this reason, it is possible to connect the connecting portion at the tip end from the winding start portion of the exciting coil to the first wiring in a form of eliminating the crossing portion crossing the outer peripheral side of the winding portion of the exciting coil. Therefore, it is possible to prevent a short circuit from occurring between the exciting coil and the coil housing holder.
According to the third aspect of the invention, the connecting portion of the exciting coil with the first connector can be pulled out from the radially outer side of the second flange to the side opposite to the first flange. Therefore, it is possible to connect the connecting portion of the exciting coil with the first connector to the first connector without being routed by the outer surface of the second flange of the bobbin.

It is sectional drawing which showed the structure of the electromagnetic clutch to which this invention is applied. It is sectional drawing which showed the outline of the structure of the bobbin which comprises the said electromagnetic clutch. It is the perspective view which showed a part of structure of the flange in which the thermal fuse of the said bobbin was arrange|positioned. It is a top view showing a part of composition of a flange in which a thermal fuse etc. of the bobbin were arranged. (A) is sectional drawing which showed the position of the winding start part and winding end part with respect to the bobbin of the exciting coil of this invention, (b) is the fuse wire which connects the thermal fuse of this invention and a connector. It is sectional drawing which showed the structure which hold|maintains. (A) is a cross-sectional view showing a conventional example in which a portion of the exciting coil that is connected to one of the fuse wires has a portion that extends over the outer circumference side of the winding portion of the exciting coil, and (b) shows the other portion of the fuse wire. It is sectional drawing which showed the conventional example which has the site|part which crosses the outer peripheral side rather than the winding part of an exciting coil. FIG. 7 is a cross-sectional view showing a conventional example in which a connecting portion at the tip of a winding end portion of an exciting coil on a bobbin is connected to a fuse wire.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

The electromagnetic clutch 1 is for transmitting or interrupting rotational power from a rotational power source such as an engine or an electric motor to a compressor 2 which is a driven device. The electromagnetic clutch 1 includes a pulley 4 rotatably supported via a bearing 3 on a cylindrical portion 2c protruding from an end of a housing 2b around a rotary shaft 2a of a compressor 2, and a shaft relative to the pulley 4. In the annular space 6 formed in the pulley 4 and the armature plate 5 that is fixed in a non-rotatable manner with respect to the rotary shaft 2a of the compressor 2 by facing a small gap in the direction, and is energized. An excitation coil 7 that forms a magnetic circuit passing through the pulley 4 and the armature plate 5 to generate an attractive force for attracting the armature plate 5 to the pulley 4, and is fixed to the rotary shaft 2a of the compressor 2. A hub 8 rotating with the rotating shaft 2a, an outer plate 9 connected to the armature plate 5, an inner plate 10 connected to the hub 8, and an elastic member interposed between the outer plate 9 and the inner plate 10. 11 and 11. That is, the armature plate 5 is connected to the hub 8 via the outer plate 9, the elastic member 11, and the inner plate 10.

The pulley 4 is formed of a magnetic material in an annular shape, and a groove 4a for attaching a connecting belt for connecting to a rotational power source is formed on the outer periphery of the pulley 4. The pulley 4 is provided with the bearing 3 on the inner circumference, and is rotatable around the outer circumference of a protruding cylindrical portion 2c extending so as to insert the rotary shaft 2a from the housing 2b of the compressor 2 through the bearing 3. Is fitted on. A friction wall 4b is formed on the side of the pulley 4 opposite to the main body of the compressor 2. An outer surface of the friction wall 4b is formed in a flat shape that is substantially perpendicular to the axis of the pulley 4, and an armature plate. 5 constitutes a friction surface facing the surface.

The armature plate 5 is formed of a magnetic material into a disc shape. The armature plate 5 is fixed to the outer plate 9 and has a side end surface 5a facing the outer surface of the friction wall 4b of the pulley 4 with a slight gap therebetween. The side end surface 5 a is formed in a flat shape that is substantially perpendicular to the axial center of the pulley 4, and constitutes a friction surface that faces the pulley 4.

The exciting coil 7 is housed in the coil housing holder 12. The coil accommodating holder 12 is composed of an annular iron container and has an annular groove 13 whose one end side is open, and the exciting coil 7 is accommodated in the annular groove 13. One end side of the coil housing holder 12 that is released is directed to the pulley 4 side, and the other end side is fixed to the housing 2b of the compressor 2 via a mounting member. The exciting coil 7 is preliminarily wound around a bobbin 15 housed in the annular groove 13 of the coil housing holder 12, and is fixed to a predetermined position inside the coil housing holder 12 by the mold resin 16 together with the bobbin 15. .. Therefore, the exciting coil 7 is embedded in the mold resin 16 together with the bobbin 15, and is fixed to the coil housing holder 12 so as not to come out of the mold resin 16.

Further, the pulley 4 is provided so that the annular space 6 is opened on the side opposite to the armature plate 5 and the coil housing holder 12 housing the exciting coil 7 is covered from the armature plate 5 side. The coil housing holder 12 is housed in the annular space 6 with a predetermined clearance. Therefore, the pulley 4 can rotate along the exciting coil 7 (coil housing holder 12) without slidingly contacting the coil housing holder 12.

In addition, although the outer plate 9, the elastic member 11, and the inner plate 10 are interposed between the hub 8 and the armature plate 5 in the above-described example, the embodiment in which the armature plate 5 is connected to the hub 8 will be described. It is not particularly limited.

In the above configuration, the bobbin 15 around which the exciting coil 7 is wound has a thermal fuse 17 that shuts off energization to the exciting coil 7 when a predetermined temperature is exceeded. The structure including the holding structure of the bobbin 15 to the thermal fuse 17, the structure of winding the exciting coil 7 around the bobbin 15, and the wiring will be described below with reference to FIGS. 2 to 5.

As shown in FIGS. 2 and 3, in particular, the bobbin 15 includes a cylindrical portion 15a and flanges 15b and 15c extending outward from the radial direction of the cylindrical portion 15a from both axial ends of the cylindrical portion 15a. It is configured to In this embodiment, the bobbin 15 is arranged so that the flange 15b faces the armature plate 5 side and the flange 15c faces the compressor 2 side, as shown in FIG.

The bobbin 15 has a fuse holder 24 extending on the outer surface (side surface of the armature plate 5) of the flange 15b toward the open end of the annular groove 13. The fuse holder 24 holds the thermal fuse 17 formed in a substantially cylindrical shape in a state where the thermal fuse 17 is laid down and a part of the thermal fuse 17 projects from the fuse holder 24. There is.

The bobbin 15 is provided with a wiring holder 25 extending toward the open end of the annular groove 13 at a position circumferentially displaced from the fuse holder 24 on the outer surface of the flange 15b and having the fuse holder 24 side open. Have In the wiring holder 25, the connector 20 that connects the exciting coil 7 and the fuse wire 18 is arranged at the deepest portion of the recess on the side opposite to the fuse holder 24. In the wiring holder 25, the standing wall portion on the inner peripheral side of the bobbin 15 has a shorter end on the fuse holding table 24 side than the standing wall portion on the outer peripheral side of the bobbin 15.

As shown in FIGS. 3 and 4, the flange 15b of the bobbin 15 is located between the fuse holding base 24 and the wiring holding base 25 and close to the end of the standing wall on the inner peripheral side of the wiring holding base 25. , Slits 26 are formed. The slit 26 is notched along the radial direction of the bobbin 15 from the outer peripheral edge of the flange 15b toward the cylindrical portion 15a, and the tip thereof is, as shown in FIG. 5A, the outer peripheral surface of the cylindrical portion 15a. It has reached the vicinity.

Further, the bobbin 15 is provided with a plurality of protrusions 27 as positioning ribs for positioning the coil accommodating holder 12 on the inner peripheral side of the cylindrical portion 15a. Of these protrusions 27, at least the protrusion 27 located on the opposite side of the fuse holder 24 from the wiring holder 25 and closest to the fuse holder 24 is projected in the radial direction of the cylindrical portion 15a. The shape is such that it extends from the flange 15b side to the flange 15c side. The protruding portion 27 has a tubular passage 28 that is open on both sides (the flange 15b side and the flange 15c side) in the extending direction of the protruding portion 27.

Then, as shown by the arrow in FIG. 5, the exciting coil 7 is folded back between the flanges 15b and 15c of the bobbin 15 and is separated from the outer peripheral surface of the cylindrical portion 15a from the side facing the outer peripheral surface of the cylindrical portion 15a. It is wound multiple times around the outer circumference of the cylindrical portion 15a so as to be displaced to the position. In this embodiment, the winding start portion S of the exciting coil 7 is a position facing the outer peripheral surface of the cylindrical portion 15a and on the flange 15b side, and the end of the winding start is the deepest side of the slit 26. It corresponds to the part. The winding end portion E of the exciting coil 7 is located on the flange 15c side and farthest from the outer peripheral surface of the cylindrical portion 15a in this embodiment.

As a result, as shown in FIG. 5A, the connecting portion 71 at the tip of the winding start portion S of the exciting coil 7 is pulled out from the slit 26 and connected to the connector 25. For this reason, the connecting portion 71 can eliminate a crossover portion extending from the winding portion A of the exciting coil 7 to the outer peripheral side. Further, the connecting portion 72 at the tip of the winding end portion E of the exciting coil 7 is not routed around the outer surface of the flange 15c on the side of the compressor 2 and one end of the connecting wire 72 is connected to the wiring 33 for supplying electricity to the exciting coil 7. It can be connected to the connected connector 31.

Then, as shown in FIG. 5B, the fuse wire 19 passes through the tubular passage 28 of the projecting portion 27, from the flange 15b side to the inner peripheral side of the cylindrical portion 15a, and then to the flange 15c. Since it can reach the side, it can be connected to the connector 32, one of which is connected to the wiring 34 for supplying electricity to the exciting coil 7. Therefore, since the fuse wire 19 is held by the tubular passage 28 on the inner peripheral side of the cylindrical portion 15a, it is possible to eliminate the crossover portion extending from the winding portion A of the exciting coil 7 to the outer peripheral side. Further, since the cylindrical passage 28 is a through hole, there is a problem that may occur when it is formed as a groove, that is, the fuse wire 19 held on the inner peripheral side of the cylindrical portion 15a of the bobbin 15 is held in the coil accommodating holder. It is possible to eliminate the problem that it is disengaged to the 12 side and a short circuit occurs with the coil housing holder 12.

DESCRIPTION OF SYMBOLS 1 Electromagnetic clutch 2 Compressor 2a Rotating shaft 4 Pulley 5 Armature plate 7 Excitation coil 71 Connection part 72 Connection part S Winding start part E Winding end part A Winding part 8 Hub 15 Bobbin 15a Cylindrical part 15b Flange (first flange)
15c Flange (second flange)
17 Thermal fuse 18 Fuse wire (first wiring)
19 Fuse wire (second wiring)
20 Connector 24 Fuse Holder 25 Wiring Holder 26 Slit 27 Projection 28 Cylindrical Passage 31 Connector (First Connector)
32 connector (second connector)

Claims (3)

An electromagnetic clutch for transmitting or interrupting rotary power from a rotary power source to a compressor,
A pulley formed of a magnetic material, rotatably supported with respect to the rotary shaft of the compressor, and rotated by receiving a rotational force from the rotational power source,
A hub connected to the rotary shaft of the compressor,
An armature plate that is formed of a magnetic material and that is connected to the hub and that is arranged to face a side end surface of the pulley;
An excitation coil that, when energized, forms a magnetic circuit that passes through the pulley and the armature plate to generate an attractive force that electromagnetically attracts the armature plate to the pulley,
First and second connectors for connecting to a wire for supplying electricity to the exciting coil;
A bobbin formed of a cylindrical portion and first and second flanges formed at both ends of the cylindrical portion, and the excitation coil wound around the outer peripheral surface of the cylindrical portion sandwiched by the two flanges;
A thermal fuse provided on the first flange for interrupting energization to the exciting coil when the sensed temperature exceeds a predetermined temperature;
First wiring for connecting the side opposite to the side of the exciting coil connected to the first connector and the temperature fuse;
An electromagnetic clutch comprising: a side opposite to a side of the temperature fuse connected to the first wiring; and a second wiring connecting the second connector,
On the inner peripheral side of the cylindrical portion of the bobbin, forming a protruding portion extending in the radial direction of the cylindrical portion and extending from the first flange side to the second flange side, the protruding portion, An electromagnetic clutch, characterized in that a tubular passage opened on both sides in the extending direction of the projecting portion is provided, and the second wiring is passed through the tubular passage. The electromagnetic clutch according to claim 1, wherein the protruding portion formed on the inner peripheral side of the cylindrical portion of the bobbin is a rib for positioning the bobbin. In the exciting coil, a winding start portion having a connection portion with the first wiring at a tip is the first flange side, and a winding end portion having a connection portion with the first connector at a tip is The electromagnetic clutch according to claim 1 or 2, wherein the electromagnetic clutch is wound around the cylindrical portion of the bobbin so as to be on the second flange side.

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