JPH11141571A - Coil rotation type electromagnetic clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coil rotation type electromagnetic clutch which can be embodied at low cost in a lightweight, small-sized construction. SOLUTION: A brush holder formed in a single piece structure is furnished on a terminal housing 16, and a conductive member 21 in the form of a leaf spring to which a brush 20 is secured, is accommodated in the brush holder. The conductive member 21 is connected electrically with a terminal 19a inserted in the housing 16 and is given an elastic returning force. The brush 20 is pressed to a slip ring by this elastic returning force of conductive member 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil rotation type electromagnetic clutch, and more particularly to a coil rotation type electromagnetic clutch which is optimally mounted on a compressor of an automotive air conditioner.

[0002]

2. Description of the Related Art A coil rotary electromagnetic clutch mounted on a compressor of an air conditioner for a vehicle rotatably supports a rotor containing an electromagnetic coil in a cylindrical support formed in a fixed housing of the compressor. And an armature having a friction surface that engages with and separates from the friction surface of the rotor,
The rotary shaft protrudes through the support portion of the fixed housing and is supported movably only in the axial direction at the shaft end. In addition, a slip ring to which the positive winding end of the electromagnetic coil is connected is coaxially arranged on the side surface of the rotor, and a terminal housing provided with a brush that slides on the slip ring is non-rotatably fixed to the fixed housing. It is a supporting structure. And
By connecting the connector of the terminal housing with the power supply side by the on-board battery, it is possible to energize the electromagnetic coil, and the magnetic flux of the electromagnetic coil frictionally engages the friction surface of the armature with the friction surface of the rotor to operate the compressor. I try to drive. The negative winding end of the electromagnetic coil is fixed to the rotor and grounded (see Japanese Patent Application Laid-Open No. 54-159549).

[0003]

In a conventional coil rotary electromagnetic clutch, a brush holder is integrally formed with a terminal housing in which a terminal is inserted, and an end of the terminal is exposed at the bottom of the brush holder and a slip is formed. A coil spring, which is a center line parallel to the axis of the rotating shaft, is interposed between the brush and the end of the terminal arranged on the brush holder so as to be able to freely enter and exit the ring side. In this structure, the brush is pressed against the slip ring. Also,
An end of the terminal and the brush are electrically connected by a conductive member formed of a lead wire inserted inside the coil spring. Therefore, since the brush holder of the terminal housing projects in the axial direction of the rotating shaft, the axial dimension of the coil rotating electromagnetic clutch, the supporting portion of the fixed housing in which the clutch is supported, and the rotating shaft penetrating the supporting portion are lengthened. However, this is a factor in increasing the size of the device.

Further, the conventional coil rotary electromagnetic clutch has a structure in which the positive winding end of the electromagnetic coil is connected to a lead wire, and the slip ring and the electromagnetic coil are electrically connected via the lead wire. Therefore, the connection work is troublesome, which is a factor of deteriorating the productivity of the coil rotary electromagnetic clutch. SUMMARY OF THE INVENTION It is an object of the present invention to solve such a problem and to provide a lightweight, compact, and inexpensive coil rotating electromagnetic clutch.

[0005]

According to a first aspect of the present invention, there is provided a coil rotary electromagnetic clutch according to the present invention, comprising: a fixed housing having a cylindrical supporting portion projecting from a side; A coil rotating electromagnetic clutch mounted on a rotating machine having a rotating shaft having a shaft end penetrating through the support portion and having a shaft end protruding from the support portion, wherein the friction surface on the shaft end side in the axial direction of the rotation shaft and the annular surface are provided. A rotor provided with a coil holding portion formed of a space and rotatably supported by the support portion of the fixed housing; and an annular ring coaxially disposed on the opposite axial end side of the rotational axis of the rotor in the axial direction. Synthetic resin in which a slip ring, a connector connected to a power supply side, and a brush holder axially opposed to the slip ring are integrally formed and non-rotatably supported by the fixed housing. A terminal housing, one end of which is exposed in the connector and the other end of which is exposed in the brush holder; and a terminal which is disposed in the brush honda and slides on the slip ring. A brush, a conductive member in the form of a leaf spring having an elastic return force for connecting the brush and the other end of the terminal and pressing the brush against the slip ring, and a window through which the brush is inserted; A cover made of a synthetic resin material provided over the brush holder, and an electromagnetic coil wound in multiple turns and housed in the coil holding portion of the rotor and having a plus side winding end connected to the slip ring, An armature provided at a shaft end of the rotating shaft so as to be movable only in the axial direction and provided with a friction surface which engages with and separates from the friction surface of the rotor. To.

[0006] In addition, an electrical connection structure between a slip ring and an electromagnetic coil is added to the first invention.
A fixed housing with a cylindrical support protruding from the side,
In a coil rotary electromagnetic clutch mounted on a rotating machine having a rotating shaft having a shaft end protruding from the supporting portion passing through the supporting portion of the fixed housing, the friction on the shaft end side in the axial direction of the rotating shaft is provided. A rotor that is provided rotatably on the support of the fixed housing, and that is coaxially disposed on a non-axial end side in the axial direction of the rotary shaft of the rotor. An annular slip ring integrally provided with a crimping portion, a connector connected to a power supply side, and a brush holder axially opposed to the slip ring are integrally formed so as to be unrotatable with the fixed housing. A supported terminal housing made of synthetic resin material, and an insert in the terminal housing such that one end is exposed in the connector and the other end is exposed in the brush holder. And a brush disposed in the brush Honda and in sliding contact with the slip ring, and an elastic return force for connecting the brush to the other end of the terminal and pressing the brush against the slip ring is provided. A leaf spring-shaped conductive member, a cover made of a synthetic resin material provided with a window portion through which the brush is inserted and covered by the brush holder, an electromagnetic coil wound in multiple turns, The connecting portion where the positive side winding end portion of the electromagnetic coil that is held and housed in the coil holding portion of the rotor and pulled out is connected to the crimping portion of the slip ring is connected in the axial direction of the rotating shaft of the rotor. Among them, a coil bobbin made of a synthetic resin material exposed on the opposite shaft end side, and a friction surface which is supported on the shaft end of the rotating shaft so as to be movable only in the axial direction and separates from the friction surface of the rotor are provided. Characterized in that a armature that is.

Further, in addition to the first and second aspects of the present invention, the shape and structure of the conductive member are added. As a third aspect of the present invention, the conductive member is connected to the other end of the terminal and is connected to the bottom of the brush holder and the inner surface of the cover. And a free end to which the brush is fixed, and a flexible portion provided between the base end and the free end. It is characterized by being linearly extended in the rotation direction and housed in a brush holder.

Further, a structure for making the surface pressure distribution of the brush uniform is added to the conductive member according to the third aspect of the present invention. According to a fourth aspect of the present invention, the conductive member has a slight transition from the flexible portion to the free end. The free end of the conductive member is formed on a plane orthogonal to the rotation axis by contacting the brush with the slip ring. Still further, a structure for fixing the base end of the conductive member to the third invention or the fourth invention is added. As a fifth invention, a U-shaped bent portion formed at the base end of the conductive member is a brush holder. And a groove into which the bent portion of the conductive member and the other end of the terminal are press-fitted on the inner surface of the cover while being fitted to the other end of the terminal protruding from the bottom of the cover. . Also, the sixth
The invention is characterized in that the bent portion formed at the base end of the conductive member is elastically deformed by being sandwiched between the other end of the terminal exposed at the bottom of the brush holder and the inner surface of the cover. And

According to a seventh aspect of the present invention, there is provided a coil rotating electromagnetic clutch according to a seventh aspect of the present invention, wherein a fixed housing having a cylindrical supporting portion protruding from a side surface, and a shaft end penetrating through the supporting portion of the fixed housing and having a shaft end extending from the supporting portion. A coil rotating electromagnetic clutch mounted on a rotating machine having a protruding rotating shaft, wherein the fixed surface is provided with a friction surface on a shaft end side in an axial direction of the rotating shaft and a coil holding portion formed of an annular space. A rotor rotatably supported by a support portion of a housing, and an annular slip ring which is coaxially disposed on an opposite axial end of the rotor in the axial direction of the rotation shaft and integrally provided with a crimping portion. A terminal housing made of a synthetic resin material, in which a brush holder axially opposed to the slip ring is integrally formed and supported non-rotatably by the fixed housing; A terminal inserted into the terminal housing so as to be exposed in a brush holder, a brush disposed in the brush honda and in sliding contact with the slip ring, and a conductive member connecting the brush and an end of the terminal. An electromagnetic coil wound in multiple turns, and a positive-side winding end of the electromagnetic coil that is held in the coil holding portion of the rotor while holding the electromagnetic coil and pulled out is a crimp portion of the slip ring. The connecting portion to be connected is a coil bobbin made of a synthetic resin material that is exposed on the opposite axial end side of the rotational axis of the rotor in the axial direction, and is supported movably only in the axial direction at the axial end of the rotary shaft. An armature provided with a friction surface of the rotor and a friction surface that engages and separates is provided.

[0010] Still further, a slip ring holding structure is added to the seventh invention.
The electromagnetic coil is inserted into a ring holding plate made of a non-magnetic material so that a crimping portion formed with an engagement groove into which the plus side winding end is engaged and a sliding surface on which the brush is pressed are exposed. The ring holding plate is fixed to the non-axial end side in the axial direction of the rotation shaft of the rotor. According to a ninth aspect of the present invention, in addition to a structure for firmly holding the slip ring holding structure of the eighth invention, the slip ring is provided with a protruding piece for preventing relative rotation with the ring holding plate. It is characterized by being buried in the holding plate.

[0011]

1 to 8 show a coil rotary electromagnetic clutch shown as an embodiment of the present invention. FIG. 1 shows a coil rotary electromagnetic clutch mounted on a compressor as a rotary machine. 2, FIG. 2 is a plan view of the terminal housing of FIG. 1, and FIG. 3 is an enlarged view of a portion viewed in the direction of the arrow A of FIG. 2, and is a plan view of the brush holder shown with the cover removed. 4 is a cross-sectional view taken along the line BB of FIG. 3 showing a state where the cover is covered, and FIG. 5 is a cross-sectional view of only the upper half of the rotor including a cross section taken along the line CC of FIG. FIG. 6 is an enlarged view of the lower half of FIG. 1 and is a sectional view of only the lower half of the rotor. 7 and 8 are plan views of the slip ring. Hereinafter, embodiments of these drawings will be described.

The coil rotation type electromagnetic clutch 1 is mounted on a fixed housing 2 in front of a compressor of an air conditioner for a vehicle. The cylindrical supporting portion 3 protruding from the side surface of the fixed housing 2 is formed with a large-diameter cylindrical portion 3a and a small-diameter cylindrical portion 3b, of which the small-diameter cylindrical portion 3b is provided via a bearing 4 which is prevented from falling off by a snap ring. The rotor 5 is rotatably supported. The inner cylindrical portion 6a of the rotor 5 in which the outer ring of the bearing 4 is press-fitted and retained by a caulking piece (not shown).
A first yoke member having a U-shaped cross section and having an outer cylindrical portion 6b whose outer peripheral surface is formed into a pulley groove by rolling and a disk portion 6c connecting these cylindrical portions 6a and 6b. 6
And a disc-shaped second yoke member 7 which is press-fitted into the opening of the first yoke member 6 and is prevented from coming off by a swaging piece (not shown).
The first and second yoke members 6 and 7 form an annular space S (coil holding portion).
The circular plate portion 6c of the first yoke member 6 is provided with a plurality of circular arc-shaped long holes 6d formed in a circumferential direction by press punching. Furthermore, the opposite side of the space S of the disk portion 6c, in other words, the rotating shaft 2 described later.
A friction surface 6e with which a friction surface 28a of an armature 28 to be described later engages and separates a side surface on the axial end side in the axial direction of the armature 3.
It is provided as.

A coil assembly is accommodated in the space S of the rotor 5. The coil assembly includes an electromagnetic coil 8 in which a self-fusing magnet wire is wound in multiple turns by a winding machine, and a holding frame 9b in which an annular groove 9a into which substantially half of the electromagnetic coil 8 is fitted is formed. And a coil bobbin 9 made of a synthetic resin material having two draw-out ports 9c formed by shifting the phase by 180 degrees at the bottom of the holding frame 9b, and an electromagnetic coil 8 protruding from the holding frame 9b of the coil bobbin 9. This is a structure including a coil cover 10 made of a synthetic resin material and having a holding frame 10b formed with an annular groove 10a to be fitted in substantially half. The overlapping surface of the holding frame 9b of the coil bobbin 9 and the holding frame 10b of the coil cover 10 is formed as a tapered mating surface. Further, the coil bobbin 9 is integrally formed with two connecting portions 11 and 12 from which the plus side winding end 8a and the minus side winding end 8b of the electromagnetic coil 8 are drawn out.

The first connecting portion 1 from which the positive winding end 8a of the electromagnetic coil 8 is drawn out of the connecting portions of the coil bobbin 9.
1 is a coil engaging groove 11a extending radially outward from the opening of the coil outlet 9c;
2 which are formed in parallel at an interval so as to intersect with 1a
The two press-fitting grooves 11b are provided, and are press-fitted into through holes 7a formed in the second yoke member 7. The second connecting portion 12 from which the minus winding end portion 8b of the electromagnetic coil 8 is drawn out has a coil engaging groove 12a extending radially inward from the opening of the coil outlet 9c, and a coil engaging groove 12a. And two press-fitting grooves 12b formed in parallel at an interval so as to intersect with each other, and are press-fitted into cutout grooves 7b formed in the second yoke member 7.

Each of the connecting portions 11 and 1 having such a structure.
2 includes crimping portions 14a and 15a of the slip ring assembly.
Are press-fitted. The slip ring assembly has a second
Ring holding plate 13 made of non-magnetic material fixed to yoke member 7
The ring is held so that the U-shaped crimping portions 14a and 15a in which the coil crimping grooves 14d and 15d are individually formed in the opposing side plates and the sliding contact surfaces 14b and 15b against which the brush 20 described later is pressed are exposed. This is a structure including an annular plus-side slip ring 14 and an annular minus-side slip ring 15 inserted into the plate 13. These slip rings 14 and 15 are arranged coaxially with the rotor 5. In order to prevent relative rotation with the ring holding plate 13, a plurality of protruding pieces 14 bent in an L-shape are provided.
c and 15c are integrally formed on the outer peripheral surface or the inner peripheral surface, and these protruding pieces 14c and 15c are embedded in the ring holding plate 13.

Next, a description will be given of the terminal housing 16 in which the brushes 20 pressed against the respective sliding contact surfaces 14b and 15b of the slip rings 14 and 15 are provided. The terminal housing 16 made of a synthetic resin material includes an annular portion 16a fitted to the large-diameter cylindrical portion 3a of the support portion 3 of the fixed housing 2, and a terminal holding portion extending radially outward from the annular portion 16a. 16b
The connector 17 provided on the distal end side of the terminal holding portion 16b and the brush holder 18 provided on the annular portion 16a side of the terminal holding portion 16b are integrally formed by resin molding.
In the terminal housing 16, two terminals 19a, 19, one end of which is exposed in a recess 17a of the connector 17, are provided.
b are inserted at intervals. Then, the annular portion 16a is fitted into the large-diameter cylindrical portion 3a, and the protrusion 16c of the annular portion 16a is formed on the side surface of the fixed housing 2.
The terminal housing 16 is non-rotatably supported by the support portion 3 of the fixed housing 2 by engaging the snap ring to prevent the terminal housing 16 from coming off after engaging with the terminal a. In addition, a flat surface is provided on the inner peripheral surface of the annular portion 16a as a detent means of the terminal housing 16, and a flat surface on which the flat surface is fitted is provided on the outer peripheral surface of the large-diameter cylindrical portion 3a of the support portion 3. May be added.

The brush holder 18 of the terminal housing 16
Extends on the parallel straight line (not shown) passing through the contact point between the slip rings 14 and 15 and the brush 20 and inclined in the rotation direction of the slip rings 14 and 15 from the contact point in the anti-rotation direction of the slip rings 14 and 15. Brush storage portions 18a and 18b, and the brush storage portions 18a and 18b
Of the slip rings 14 and 15, the mounting portions 18c and 18d individually provided at the ends of the slip rings 14 and 15 on the anti-rotation direction side, and the terminal of the plus side terminal 19a from the end of each of the brush housing portions 18a and 18b. End and negative terminal 19b
Are projected in the axial direction of the rotating shaft 23. The brush housing 18a and the brush housing 18b are divided by a partition 18e.

The brush housings 18a and 18b have
A leaf spring-shaped conductive member 21 to which the brush 20 is fixed is housed. The conductive member 21 includes a base end portion 21a mounted on the mounting portions 18c and 18d of the brush holder 18, a free end portion 21b having a U-shaped cross section to which the brush 20 is fixed, and a free end portion with the base end portion 21a. It has a flexible portion 21c that is elastically deformed between the end portion 21b. Also, each base end 21a has a U fitted to the end of the terminal 19a / 19b.
A cut-and-raised piece (not shown) in which a small-diameter cylindrical portion 20a of the brush 20 is inserted into each free end 21b and meshes with a narrow portion of the small-diameter cylindrical portion 20a is formed at each free end 21b. Is provided with a through hole (not shown) formed on the periphery. The state shown by a solid line in FIGS. 3 and 4 is a state in which the brush 20 is in contact with the slip rings 14 and 15. The state shown by the two-dot chain line in FIG. 4 is a state when the conductive member 21 is formed, and the center line Q of the free end portion 21b is inclined by an angle R with respect to the center line P of the flexible portion 21c. ing. The brush 20 is inclined to make the initial surface pressure distribution uniform when the flat rectangular end surface of the brush 20 is pressed by the flat sliding contact surfaces 14b and 15b of the slip rings 14 and 15. Abuts on the slip rings 14 and 15 so that the conductive members 21
Is configured on a plane orthogonal to the rotation shaft 23.

A cover 22 made of a synthetic resin material is put on the brush holder 18 in which the conductive member 21 and the brush 20 are accommodated, and is integrally welded thereto. On the inner surface of the cover 22, the ends of the terminals 19a and 19b and the groove 22a into which the bent portion 21d of the conductive member 21 is press-fitted, and the base end 21a of the conductive member 21 into the mounting portion 18c of the brush holder 18 are provided. The overlapping portion 22b, which is overlapped through the window portion, the window portion 22c through which the brush 20 is freely inserted and removed, and the stopper portion 22d provided on a part of the periphery of the window portion 22c to limit the elastic return amount of the conductive member 21, It is integrally formed by resin molding.

Next, an armature assembly including an armature 28 having a friction surface 28a opposed to the friction surface 6e of the rotor 6 with a predetermined air gap G will be described. The rotary shaft 23 penetrating through the support portion 3 of the fixed housing 2 of the compressor has a shaft end in which a spline groove and a screw hole are formed protruding from the support portion 3, and a hub 2
4 is spline-fitted. An inner supporting plate 25 integrally formed with a cylindrical portion 25a is formed on the flange portion of the hub 24.
Are fixed by rivets, the periphery of the center hole of the inner support plate 25 is brought into contact with the shaft end of the rotating shaft 23, and a bolt is inserted from the center hole and screwed into the screw hole of the rotating shaft 23, thereby obtaining an armature. The assembly is integrally mounted on the rotating shaft 23. An outer support plate 26 is provided in which a cylindrical portion 26a of the inner support plate 25 and a cylindrical portion 26a facing radially outward are integrally formed. The inner peripheral surface is fixed to the cylindrical portion 25a, and the outer peripheral surface is a cylindrical portion 26a. The inner support plate 25 and the outer support plate 26 are connected by a damper rubber 27 fixed to the inner support plate 25. Further, an armature 28 is fixed to the outer support plate 26 with a rivet via a spacer. The armature 28 has a friction surface 28a opposed to the friction surface 6e of the rotor 5 with an air gap G therebetween, and a plurality of arc-shaped long holes 28b formed to be intermittently formed in the circumferential direction. Further, the side surface of the armature 28 opposite to the friction surface 28 a is formed by the elastic return force of the damper rubber 27.
Stopper rubber 27a formed integrally with damper rubber 27
Is in contact with

In the coil rotating electromagnetic clutch 1 having the above-described structure, when the vehicle-mounted engine is driven, the rotor 5 rotates together with the pulley of the auxiliary machine (not shown). Further, the coil rotating type electromagnetic clutch 1 includes a brush 20.
Is pressed by the slip rings 14 and 15, and the connector on the power supply line which is powered by the vehicle-mounted battery is connected to the connector 17 of the terminal housing 16. Electric current is applied to generate magnetic flux. Since the magnetic flux flows from the first yoke member 6 of the rotor 5 to the double flux type magnetic flux circuit bypassed to the armature 28, the friction surface 28 a of the armature 28 resists the elastic restoring force of the damper rubber 27. It is frictionally engaged with the friction surface 6e. Then, the rotor 5 and the rotating shaft 23 rotate integrally, and the compressor is driven. When the drive switch of the compressor is turned off, the power supply to the electromagnetic coil 8 is cut off and the magnetic flux disappears.
Frictional surface 28a of the armature 28
Are separated from the friction surface 6e of the rotor 5 to form an air gap G. Then, rotation transmission to the rotating shaft 23 is interrupted, and the compressor stops.

In this embodiment, the ground line of the power supply circuit and the electromagnetic coil 8 are connected via the negative terminal 19b.
Is connected to the negative winding end 8b of the electromagnetic coil 8 as described in the related art.
b can be connected to the first and second yoke members 6 and 7 of the rotor 5 to form a body earth type coil rotating electromagnetic clutch. In such a case, the minus side terminal 19b and the minus side slip ring 15, and the conductive member 21 and the brush 20 connecting them can be omitted.

Next, another embodiment of the present invention will be described. FIG. 9 is a sectional view of only the upper half of the rotor shown in FIG. Note that the same components as those in the above embodiment are denoted by the same reference numerals, and redundant description will be omitted. The rotor 29 of this drawing is similar to the rotor of the coil rotary electromagnetic clutch described in the related art, and includes a disk-shaped first yoke member 30 and a second yoke member 31 having a U-shaped cross section and an annular shape. Annular space S in which the coil assembly is accommodated
(Coil holding portion) is formed. The outer side surface (side surface on the shaft end side of the rotating shaft) of the first yoke member 30 is used as a friction surface 30a, and arc-shaped notches 30b and 30c formed on the inner and outer peripheral surfaces. In addition, arc-shaped long holes for bypassing the magnetic flux are provided twice. The second yoke member 31 includes an inner cylindrical portion 31a into which the bearing 4 is press-fitted and retained, an outer cylindrical portion 31b having an outer peripheral surface formed into a pulley groove by rolling, and A disc portion 31c is provided which connects the portion 31a and the cylindrical portion 31b. The disc portion 31c has a through hole 31d into which the connection portions 11 and 12 of the coil bobbin 9 are press-fitted, and a notch (not shown). Are formed. The coil rotary electromagnetic clutch provided with the rotor 29 having such a structure can achieve the same operation as that of the previous embodiment.

Next, still another embodiment of the present invention will be described. 10 and 11 show the same as FIGS. 3 and 4, FIG. 10 is a plan view of the brush holder shown with the cover removed, and FIG. 11 shows the brush holder with the cover attached. FIG. 11 is a sectional view taken along line DD of FIG. 10. Note that the same reference numerals are given to the same components as those in the above-described embodiment, and the description thereof will not be repeated. The leaf-spring-shaped conductive member 32 in these drawings is bent in a U-shape, and is superimposed on the end of the plus side terminal 19 a which is exposed flat at the bottom of the brush holder 33. Elastically deformed base end 32
a, a free end 32b to which the brush 35 is fixed, and a flexible portion 32c elastically deformed between the base end 32a and the free end 32b. Also, brush 3
The free end portion 32b is slightly inclined with respect to the flexible portion 32c so that the surface pressure distribution of No. 5 becomes uniform. Reference numeral 34
Reference symbol a denotes a projecting portion of the cover 34 on which the base end portion 32a of the conductive member 32 is hung, and reference numeral 34b denotes a window of the cover 34 through which the brush 35 is inserted. The coil rotation type electromagnetic clutch including the conductive member 32 having such a structure
The same operation as in the previous embodiment can be obtained.

Although the embodiments of the present invention have been described in detail, the rotating machine according to the present invention is not limited to a compressor of an air conditioner for a vehicle, but is also used in many other fields such as other auxiliary machines for a vehicle and machine tools. This includes the rotating machines used. Further, the present invention is not limited to the coil rotary electromagnetic clutch shown in the embodiment in details such as the shape of the pulley groove provided in the rotor and the structure for supporting the armature on the rotating shaft.

[0026]

According to the first aspect of the present invention, there is provided a coil rotating electromagnetic clutch having a leaf spring-shaped conductive member connected to the brush and the other end of the terminal and having an elastic restoring force for pressing the brush against the slip ring. Therefore, the brush holder of the terminal housing is formed in a flat shape, and the axial dimension of the coil rotating electromagnetic clutch, the supporting portion of the fixed housing on which the clutch is supported, and the rotating shaft passing through the supporting portion are shortened. It is possible to provide a lightweight and inexpensive coil rotation type electromagnetic clutch which is reduced in size.

According to a second aspect of the present invention, there is provided a coil rotating electromagnetic clutch.
A crimping part which connects the brush and the other end of the terminal and which is provided with a leaf spring-like conductive member provided with an elastic restoring force for pressing the brush against the slip ring, and which is integrally provided on the slip ring, Since the connection is made to the plus-side winding end drawn out, the size of the apparatus can be reduced and the productivity can be improved, so that a lightweight, compact and inexpensive coil rotating electromagnetic clutch can be provided.

According to a third aspect of the present invention, there is provided a coil rotating electromagnetic clutch.
In the first invention or the second invention, the leaf spring-shaped conductive member is linearly extended in the counter-rotating direction of the slip ring and accommodated in the brush holder. In other words, the conductive member is disposed in the direction in which the conductive member is pulled. Therefore, there is no minute vibration of the conductive member due to the sliding resistance between the brush and the slip ring, and stable power supply can always be performed.

The coil rotating type electromagnetic clutch of the fourth invention is
In the third invention, the free end of the conductive member is formed on a plane perpendicular to the rotation axis by abutting the brush on the slip ring, so that the surface pressure distribution becomes uniform and uneven wear of the brush is reduced. Thus, stable power supply can be performed for a long time.

According to a fifth aspect of the present invention, there is provided a coil rotating electromagnetic clutch.
In the third invention or the fourth invention, the U-shaped bent portion of the conductive member is fitted to the end of the terminal protruding from the bottom of the brush holder, and these are press-fitted into the grooves provided on the inner surface of the cover. Therefore, the connection portion between the terminal and the conductive member has a connection structure that is easy to assemble and has excellent durability, thereby improving quality.

The coil rotating type electromagnetic clutch of the sixth invention is
In the third and fourth inventions, a bent portion is formed at the base end of the conductive member, and is held between the end of the terminal exposed at the bottom of the brush holder and the inner surface of the cover to be elastically deformed. As a result, the connection portion between the terminal and the conductive member has a connection structure that is easy to assemble and has excellent durability, thereby improving quality.

According to a seventh aspect of the present invention, there is provided a coil rotation type electromagnetic clutch.
Since the crimping portion provided integrally with the slip ring is connected to the plus-side winding end drawn out to the connection portion of the coil bobbin, it is possible to provide an inexpensive coil rotary electromagnetic clutch with improved productivity. .

According to an eighth aspect of the present invention, there is provided a coil rotation type electromagnetic clutch.
In the seventh invention, since the crimping portion of the slip ring inserted into the ring holding plate made of a nonmagnetic material is press-fitted into the connection portion of the coil bobbin, the slip ring can be easily arranged on the rotor, and The performance is improved.

The ninth aspect of the present invention provides a coil rotating electromagnetic clutch,
The relative rotation between the slip ring and the ring holding plate is prevented by providing the protruding piece on the slip ring and burying the projecting piece in the ring holding plate, thereby improving the quality.

[Brief description of the drawings]

FIG. 1 is a sectional view of a coil rotary electromagnetic clutch mounted on a compressor.

FIG. 2 is a plan view of the terminal housing of FIG. 1;

FIG. 3 is an enlarged view of a portion viewed in the direction of arrow A in FIG. 2, and is a plan view of the brush holder shown with a cover removed.

FIG. 4 is a cross-sectional view taken along line BB of FIG. 3 showing a state where a cover is put on;

FIG. 5 is a sectional view of only the upper half of the rotor including a section taken along line CC of FIG. 3;

FIG. 6 is an enlarged view of the lower half of FIG. 1, and is a cross-sectional view of only the lower half of the rotor.

FIG. 7 is a plan view of a plus side slip ring.

FIG. 8 is a plan view of a negative side slip ring.

9 is a sectional view of another embodiment, showing only the upper half of the rotor shown in FIG.

FIG. 10 is a plan view of another embodiment of the brush holder shown in FIG. 3;

FIG. 11 is a view showing the state of FIG.
It is a line sectional view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 2 ... Fixed housing 3 ... Support part 5 ... Rotor 8 ... Electromagnetic coil 9 ... Coil bobbin 10 ... Coil cover 11 ... Connection part 12 ... Connection part 13 ... Ring holding plate 14 ... Slip ring 15 ... Slip ring 16 ... Terminal housing 17 ... Connector 18 ... brush holder 19a ... terminal 19b ... terminal 20 ... brush 21 ... conductive member 21a ... base end 21b ... free end 21c ... flexible part 22 ... cover 28 ... armature 29 ... rotor 32 ... conductive member 33 ... brush holder 34 … Cover 35… brush

Claims (9)

[Claims] 1. A coil mounted on a rotating machine having a fixed housing having a cylindrical support protruding from a side surface, and a rotating shaft having a shaft end protruding from the support penetrating through the support of the fixed housing. In a rotary electromagnetic clutch, a rotor rotatably supported by a support portion of the fixed housing, provided with a friction surface on the shaft end side in the axial direction of the rotation shaft and a coil holding portion formed of an annular space, An annular slip ring disposed coaxially on the opposite shaft end side in the axial direction of the rotation shaft of the rotor, a connector connected to the power supply side, and a brush holder axially opposed to the slip ring in the axial direction. And a terminal housing made of a synthetic resin material which is formed so as to be non-rotatably supported by the fixed housing, so that one end is exposed in the connector and the other end is exposed in the brush holder. A terminal inserted into the terminal housing, a brush disposed in the brush honda and in sliding contact with the slip ring, and an elasticity for connecting the brush to the other end of the terminal and pressing the brush against the slip ring. A leaf spring-shaped conductive member to which a restoring force is applied, a synthetic resin material cover provided with a window through which the brush is inserted and covered by the brush holder, An electromagnetic coil accommodated in a coil holding portion and having a plus-side winding end connected to the slip ring; and a friction engaged with and separated from a friction surface of the rotor supported on the shaft end of the rotating shaft so as to be movable only in the axial direction. A coil rotary electromagnetic clutch comprising an armature having a surface. 2. A coil mounted on a rotating machine having a fixed housing having a cylindrical support protruding from a side surface and a rotating shaft having a shaft end protruding from the support penetrating through the support of the fixed housing. In a rotary electromagnetic clutch, a rotor rotatably supported by a support portion of the fixed housing, provided with a friction surface on the shaft end side in the axial direction of the rotation shaft and a coil holding portion formed of an annular space, An annular slip ring provided coaxially on the opposite shaft end side in the axial direction of the rotary shaft of the rotor and integrally provided with a crimping portion; a connector connected to a power supply side; the slip ring; A terminal housing made of a synthetic resin material integrally formed with a brush holder opposed in the direction and supported non-rotatably by the fixed housing, one end being exposed in the connector and the other end being A terminal inserted into the terminal housing so as to be exposed in a brush holder, a brush disposed in the brush honda and slidably in contact with the slip ring, and connecting the brush to the other end of the terminal; A conductive member in the form of a leaf spring having an elastic restoring force for pressing a brush against the slip ring, a cover made of a synthetic resin material provided with a window through which the brush is inserted and covered on the brush holder; An electromagnetic coil wound around a strip, and a positive winding end of the electromagnetic coil which is held in the coil holding portion of the rotor while holding the electromagnetic coil and is pulled out is connected to a crimping portion of the slip ring. A connection bobbin made of a synthetic resin material that is exposed to the opposite axial end of the rotation axis of the rotor, Coil rotary electromagnetic clutch, characterized in that the friction surface and the friction surface engaging spaced a movably supported the rotor is provided with an armature provided. 3. The coil rotary electromagnetic clutch according to claim 1, wherein the conductive member is connected to the other end of the terminal and is held between a bottom of the brush holder and an inner surface of the cover. A base end portion, a free end portion to which the brush is fixed, and a flexible portion provided between the base end portion and the free end portion. A coil rotating electromagnetic clutch, which is linearly extended and accommodated in the brush holder. 4. The coil rotating type electromagnetic clutch according to claim 3, wherein a portion of the conductive member that transitions from the flexible portion to the free end is slightly bent, and the brush is attached to the slip ring. The coil rotating electromagnetic clutch, wherein the free end of the conductive member is formed on a plane orthogonal to the rotation axis by being in contact with the rotating member. 5. The coil rotary electromagnetic clutch according to claim 3, wherein a U-shaped bent portion formed at a base end of the conductive member protrudes from a bottom portion of the brush holder. A coil is fitted to the other end of the terminal, and a groove is formed on the inner surface of the cover to press-fit the bent portion of the conductive member and the other end of the terminal. Type electromagnetic clutch. 6. A terminal according to claim 3, wherein a bent portion formed at a base end of said conductive member is exposed at a bottom of said brush holder. A coil rotating electromagnetic clutch, which is elastically deformed by being sandwiched between the clutch and an inner surface of the cover. 7. A coil mounted on a rotating machine having a fixed housing with a cylindrical support protruding from a side surface, and a rotating shaft penetrating through the support of the fixed housing and having a shaft end protruding from the support. In a rotary electromagnetic clutch, a rotor rotatably supported by a support portion of the fixed housing, provided with a friction surface on the shaft end side in the axial direction of the rotation shaft and a coil holding portion formed of an annular space, An annular slip ring, which is coaxially disposed on the opposite shaft end side in the axial direction of the rotating shaft of the rotor and integrally provided with a crimp portion, and a brush holder axially opposed to the slip ring are integrally formed. A terminal housing made of a synthetic resin material which is formed in a fixed shape and is non-rotatably supported by the fixed housing; and an insert into the terminal housing such that an end is exposed in the brush holder. A brush, which is disposed in the brush honda and is in sliding contact with the slip ring,
A conductive member for connecting the brush and an end of the terminal,
An electromagnetic coil wound in multiple turns, and a positive winding end of the electromagnetic coil that is held in the coil holding portion of the rotor while holding the electromagnetic coil is connected to a crimping portion of the slip ring. A connection bobbin made of a synthetic resin material that is exposed to the opposite end of the axis of the rotation shaft of the rotor, and a rotor that is movably supported on the end of the rotation shaft only in the axial direction. And a armature provided with a friction surface that engages and separates from the armature. 8. The coil rotary electromagnetic clutch according to claim 7, wherein the slip ring is formed by the brush and the crimping portion having an engagement groove into which a plus-side winding end of the electromagnetic coil is engaged. The sliding contact surface to be pressed is inserted into a ring holding plate made of an annular non-magnetic material so as to be exposed, and the ring holding plate is located on a non-axial end side in the axial direction of the rotating shaft of the rotor. A coil rotating type electromagnetic clutch, which is fixed. 9. The coil rotating electromagnetic clutch according to claim 8, wherein the slip ring is provided with a projecting piece for preventing relative rotation with the ring holding plate, and is embedded in the ring holding plate. And a coil rotating electromagnetic clutch.