JP2001041263A - Electromagnetic clutch and method for assembling the clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify assembly of the rotary member side, in a coil rotation type electromagnetic clutch. SOLUTION: Slip springs 19 and 20 parts and an electromagnetic coil 2 part are preliminarily integrally formed as one assembly 4. After a rotary member 1 is rotatably assembled in the housing 6 of a rotary machine 5 through bearings 7, the assembly 4 is assembled to the rotary member 1. This constitution, since the slip rings 19 and 20 parts and the electromagnetic coil 2 part are preliminarily integrally formed at the assembly 4, completes assembly of the rotary member 1 side through approximate two processes of one being a process wherein the rotary member 1 is assembled on the rotary machine 5 side and the other being a process wherein the assembly 4 is assembled on the rotary member 1 side.

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 interrupting power transmission and a method for assembling the same, and is suitable for driving a compressor of a refrigeration cycle of an air conditioner for a vehicle.

[0002]

2. Description of the Related Art In a conventional electromagnetic clutch of this type,
A coil rotating type in which an electromagnetic coil is installed on the rotating member side is proposed in Japanese Utility Model Laid-Open No. 1-131028, Japanese Utility Model Laid-Open No. 2-54928, and the like. Since these coil rotating types can form a magnetic circuit only with a rotating member and an armature magnetically attracted to the rotating member, they are compared with a coil fixed type (a magnetic circuit is constituted by a rotating member, a fixing member and an armature). Therefore, there is an advantage that the magnetic loss becomes very small and the magnetic efficiency can be greatly improved.

[0003]

However, in the former publication, a current-carrying member, such as a slip ring or a brush, for energizing the rotating electromagnetic coil is arranged on the side of the electromagnetic coil portion in the axial direction. As a result, the axial dimension of the electromagnetic clutch increases, making it difficult to mount the electromagnetic clutch in a narrow space such as a vehicle engine room. Further, since the brush is located at a position where the distance (radius) from the center of rotation of the electromagnetic clutch is relatively large, there is a problem that the peripheral speed of sliding on the brush surface is increased and the life of the brush is shortened.

In the latter publication, a current-carrying member such as a slip ring or a brush is disposed further axially outward from the tip of the rotating shaft of a driven device such as a compressor. There is a problem that the axial dimension of the electromagnetic clutch increases.

Accordingly, the present inventors are currently developing an electromagnetic clutch which is of a coil rotating type and which can reduce the axial dimension and improve the brush life.
It has been previously proposed in Japanese Patent Application No. 10-239028.

According to the prior application, in an electromagnetic clutch applied to a rotary machine such as a compressor having a rotary shaft disposed at the center of a cylindrical boss of a housing, an inner circumferential side of the cylindrical boss of the housing is provided. Paying attention to the space, a sliding energizing mechanism including a slip ring and a brush that presses and slides on the slip ring is arranged at a portion on the inner peripheral side of the boss portion, and electromagnetic force on the rotating member side is passed through the sliding energizing mechanism. The coil is energized.

According to this prior application, since the sliding energizing mechanism is located on the inner peripheral side of the boss portion, the coil energizing path can be formed with almost no increase in the axial dimension even in the case of a coil rotating type clutch. it can. Therefore, the electromagnetic clutch can be easily mounted even in a narrow space such as a vehicle engine room. In addition, since the slip ring and the brush can be arranged at a position where the distance (radius) from the rotation center of the electromagnetic clutch is small, the sliding peripheral speed on the brush surface is reduced, and the life of the brush can be improved.

[0008] When the prototype of the prior application was actually evaluated, it was found that the following problems occurred in the assemblability of the electromagnetic clutch. That is, in order to electrically connect the electromagnetic coil on the rotating member side and the slip ring of the sliding energizing mechanism located on the inner peripheral side of the boss, the holding member of the slip ring is moved from the inner peripheral side of the boss to the position of the electromagnetic coil. Must be arranged in such a way as to extend radially up to it. As a result, after the slip ring is assembled, the slip ring holding member covers the tip of the boss.

In view of this, the inventors of the present invention have assembled an electromagnetic clutch by assembling only the electromagnetic coil portion on the rotating member, and in this state, assembling a bearing on the inner peripheral portion of the rotating member, and mounting the bearing on the rotating member. It is fixed to the outer peripheral side of the boss by means such as a clip. After that, an assembly method of fixing the slip ring holding member to the rotating member by means of screws or the like and electrically connecting the slip ring and the electromagnetic coil was examined.

However, according to this assembling method, it is necessary to separately perform the step of assembling the electromagnetic coil portion to the rotating member, the step of fixing the slip ring holding member, and the step of electrically connecting the slip ring to the electromagnetic coil. This increases the number of assembly steps and increases the assembly cost.

[0011] The present invention has been made in view of the above points,
An object of the present invention is to simplify assembly of a rotating member side in a coil rotation type electromagnetic clutch.

[0012]

In order to achieve the above object, according to the first to third aspects of the present invention, a slip ring (19, 20) portion and an electromagnetic coil (2) portion are previously assembled to an assembly (4). After the rotation member (1) is rotatably mounted on the housing (6) of the rotary machine (5) via the bearing (7), the assembly (4) is mounted on the rotation member (1). It is characterized by:

According to this, the slip rings (19, 2)
Since the part (0) and the part of the electromagnetic coil (2) are integrated in the assembly (4) in advance, the step of assembling the rotating member (1) on the rotary machine (5) side and rotating the assembly (4) The assembly on the rotating member side can be completed in approximately two steps including the step of assembling on the member (1) side. Therefore, the slip ring (1
Even when the holding portions of the components (9, 20) cover the tip of the boss portion (6a) of the housing (6) of the rotary machine (5), assembly on the rotating member side can be easily performed.

According to a second aspect of the present invention, in the first aspect, the rotary machine (5) includes a boss (6a) that protrudes cylindrically outward of the housing (6) in the axial direction, and the boss (6a). ), A rotating shaft (12) is arranged at the center, and brushes (22, 23) and slip rings (19, 20) are arranged on the inner peripheral side of the boss (6a).

According to this, the sliding energizing mechanism can be located on the inner peripheral side of the boss portion (6a), so that the size of the coil rotating electromagnetic clutch can be reduced, and the distance from the rotation center of the electromagnetic clutch ( Since the slip rings (19, 20) and the brushes (22, 23) can be arranged at a portion having a small radius, the peripheral speed of the brush sliding surface is reduced, and the life of the brush can be improved.

According to a third aspect of the present invention, in the first or second aspect, the slip ring (19, 2) is attached to the assembly (4).
It is characterized in that the part (0) and the part of the electromagnetic coil (2) are integrated by resin molding.

According to this, the slip ring (19, 20) and the electromagnetic coil (2) can be easily integrated by resin molding.

The invention described in claim 4 is the first to third aspects of the present invention.
The method of assembling an electromagnetic clutch according to any one of the above, wherein a step of integrating a slip ring (19, 20) portion and an electromagnetic coil (2) portion as one assembly (4); A step of rotatably mounting the rotating member (1) to the housing (6) of the machine (5) via a bearing (7), and after this assembling step, attaching the assembled body (4) to the rotating member (1). And an assembling step.

[0019] Thus, it is possible to provide an assembling method that can easily assemble the rotating member side in the coil rotating electromagnetic clutch.

Note that the reference numerals in parentheses of the above means indicate the correspondence with specific means described in the embodiment described later.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. 1 to 3 show an embodiment of the present invention, in which 1 is a driving-side rotor, and a multiple V
A pulley portion 1a having multiple V-grooves with which the belt is engaged is integrally joined. The drive-side rotor 1 is a drive-side rotating member that rotates by receiving torque from an automobile engine via a belt (not shown), and is made of an iron-based metal (ferromagnetic material) such as low carbon steel and has a U-shaped cross section. In a double ring shape.

An annular concave portion 1d is formed between the inner cylindrical portion 1b and the outer cylindrical portion 1c of the driving rotor 1. Reference numeral 2 denotes an electromagnetic coil for generating an electromagnetic attraction force, which is integrally formed on a resin-made holding member 4 while being wound on a resin winding frame 3, and then the electromagnetic coil 2 and the holding member 4 are driven together. It is integrally insulated and fixed in the recess 1d of the rotor 1. Details of the assembly structure of the electromagnetic coil 2 will be described later. A friction surface 1e is formed on the radial side surface of the rotor 1, that is, on the end surfaces of the inner cylindrical portion 1b and the outer cylindrical portion 1c.

Reference numeral 5 denotes a compressor which is a driven device (rotary machine), and reference numeral 6 denotes a front housing of the compressor 5 located on the electromagnetic clutch side. The front housing 6 is made of an aluminum-based metal, and has a boss (fixing member) 6a which protrudes cylindrically outward in the axial direction at the center thereof. Here, the compressor 5 is for compressing a refrigerant in a refrigeration cycle of a vehicle air conditioner, and is a known swash plate type.
Any type such as a vane type or a scroll type may be used.

Reference numeral 7 denotes a bearing for rotatably supporting the driving rotor 1 on the boss 6a of the front housing 6. In this embodiment, the bearing 7 is press-fitted and fixed to the inner peripheral surface of the driving rotor 1 by an interference fit. Outer ring 7a, inner ring 7b fitted loosely on the outer peripheral surface of boss 6a, and both inner rings 7a, 7a.
and a rolling bearing having a ball 7c which is rotatably held between the rolling bearings b. The inner ring 7b of the bearing 7 is fixed on the boss 6a by a circlip (fixing means) 14a.

Reference numeral 8 denotes an armature disposed opposite to the friction surface 1e of the rotor 1, and is formed of an iron-based metal (ferromagnetic material) in a ring-shaped flat plate shape. The armature 8 is held by a spring force of a leaf spring (elastic connecting member) 9 at a position (a position shown in FIG. 1) at a predetermined minute distance from the friction surface 1e of the rotor 1 when the electromagnetic coil 2 is not energized. Has become.

In this embodiment, the leaf spring 9 is formed of a disc-shaped disc spring having a center hole 9a. The outer periphery of the leaf spring 9 is connected to the outer periphery of the armature 8 by a plurality of rivets 10a. The inner periphery of the spring 9 is connected to the hub 11 by a plurality of rivets 10b. The leaf spring 9 is integrally formed with a plurality of protrusions 9b protruding toward the armature 8 in the circumferential direction. The protrusions 9b give the plate spring 9 an initial deflection, so that the electromagnetic coil 2 is de-energized. Sometimes, a spring force (initial reaction force) for holding the armature 8 at the predetermined position in FIG. 1 is obtained.

The hub 11 is a driven-side rotating member, and includes a plate portion 11a extending in a radial direction of a ferrous metal and a central cylindrical portion 11a.
b). The central cylindrical portion 11b of the hub 11 is fitted to the rotating shaft 12 of the compressor 5 by being prevented from rotating by spline coupling or the like. And the rotating shaft 1
The hub 11 is integrally connected to the rotary shaft 12 by screwing a bolt 13 into a second screw hole (not shown) at the tip.

Next, a description will be given of the configuration of a current supply path to the electromagnetic coil 2 which rotates together with the rotor 1. In this embodiment,
A brush energizing mechanism having brushes 22 and 23 arranged on the inner peripheral side of the compressor boss portion 6a supporting the bearing 7 and slip rings 19 and 20 on which the brushes 22 and 23 are slidably pressed. are doing.

Next, the specific configuration of the sliding energizing mechanism will be described in detail. FIGS. 2 and 3 show the overall configuration of the resin holding member 4 described above. A disk portion 40 that constitutes a body and extends in a radial direction;
An annular portion 4 protruding in the axial direction from the outer peripheral portion of the disk portion 40
1 is formed of a resin (electric insulating material). Slip rings 19, 20 are attached to the former disc portion 40.
The resin winding frame 3 and the electromagnetic coil 2 are integrally formed on the annular portion 41 by insert molding. Reference numeral 42 denotes a center hole which is fitted on the outer peripheral side of the center cylindrical portion 11b of the hub 11 at a predetermined interval.

The positive and negative slip rings 1
As shown in FIG. 2, the diameters 9 and 20 are set concentrically with the holding member 4 so that one of them has a large diameter and the other has a small diameter so that they overlap in the radial direction. The two slip rings 19 and 20 are arranged so as to be located on the inner peripheral side of the boss 6a.

The two slip rings 19, 20 are made of a conductive metal such as copper, and have connection pieces 19a, 20 respectively.
a is integrally formed by a method such as cutting and pressing. Here, the connecting pieces 19a and 20a are each 180 °
It is formed in an elongated shape so as to extend radially outward at the symmetric position. Terminal pieces 19b and 20b are integrally formed on the outer peripheral ends of the connection pieces 19a and 20a, respectively. The lead wires 15 and 16 at the winding start end and winding end of the electromagnetic coil 2 are connected to the terminal strips 19b and 20b.
(FIG. 2) are mechanically and electrically connected by mechanically caulking and soldering.

The surfaces of the two slip rings 19 and 20 facing the brushes 22 and 23 are ring-shaped grooves 43 and 4.
4 to the outside. The tips of the brushes 22 and 23 are inserted into the grooves 43 and 44, and
Contact the surface of 9,20. Here, by forming the groove portions 43 and 44 into a tapered shape in which the cross-sectional area gradually decreases from the brushes 22 and 23 toward the surfaces of the slip rings 19 and 20, the tip portions of the brushes 22 and 23 are always slip ring-shaped. 19 and 20 are stably brought into contact with the surface.

In the disk portion 40 of the resin holding member 4,
A discharge hole 45 for brush abrasion powder is formed in an intermediate portion between the two slip rings 19 and 20. A plurality of discharge holes 45 are provided in the circumferential direction of the holding member 4 (in this example, three discharge holes as shown in FIG. 2).
) And open in the groove 44 on the inner peripheral side.

Further, two arc-shaped grooves 46 extending substantially in the circumferential direction are provided in a portion of the disc portion 40 of the resin holding member 4 near the outer periphery so as to penetrate in the plate thickness direction. When the inner peripheral cylindrical portion 1b of the rotor 1 penetrates the groove 46, the distal end portion 1b 'of the inner peripheral cylindrical portion 1b can directly face the armature 8. The rotor 1
A groove portion is formed in the distal end portion 1b 'of the inner peripheral cylindrical portion 1b for fitting the connection pieces 19a and 20a of the disk portion 40.

An annular fitting surface 47 fitted to the inner peripheral surface of the inner cylindrical portion 1b of the rotor 1 is formed on the disk portion 40 of the resin holding member 4 so as to protrude in the axial direction. This mating surface 4
7 and the annular portion 41, the inner cylindrical portion 1 of the rotor 1
By fitting on both the inner and outer surfaces of b, the accuracy of the perpendicularity between the radial direction of the disk portion 40 of the resin holding member 4 and the axial direction of the rotor 1 is improved. Further, a screw hole (engaging hole) 48 for engaging a removal tool used when the resin holding member 4 is detached from the rotor 1 is formed in the disk portion 40 of the resin holding member 4.

The resin holding member 4 is fixed to the drive-side rotor 1 by a circlip (fixing means) 14b after the annular portion 41 is inserted into the recess 1d of the drive-side rotor 1. Thereby, the holding member 4 can be integrated with the rotor 1, and the holding member 4 rotates integrally with the rotor 1.

On the other hand, the rotary shaft 12 of the compressor 5 and the hub 1
1, a cylindrical space 21 is formed between the central cylindrical portion 11b and the inner peripheral surface of the boss portion 6a. , 23 holding members 24 are arranged.

The brush holding member 24 has a brush receiving recess 24.
a, 24b and a ring-shaped bottom portion 24 are formed into an annular shape with an electric insulating material such as a resin. The brush accommodating recesses 24a and 24b are formed in an arc-shaped cross section at symmetric positions approximately 180 ° apart in the circumferential direction of the brush holding member 24, and have a sufficient axial dimension (depth) extending along the axial direction of the brush holding member 24. ), And the bottom is a bottom 2
It is closed at 4c.

The brushes 22 and 23 are formed in an arc-shaped cross section along the brush accommodating recesses 24a and 24b. One brush 22 is accommodated in the brush accommodating recess 24a so as to be slidable in the axial direction. A coil spring 25 is disposed as an elastic pressing member between one end of the brush 22 and the bottom surface 24c of the brush housing recess 24a. Therefore, the other end of the brush 22 is always pressed against one slip ring 19 by the spring force of the coil spring 25.

Similarly, the other brush 23 is axially slidably housed in the other brush housing recess 24b, and one end of the brush 23 and the bottom surface 2 of the brush housing recess 24b.
4c as an elastic pressing member.
Is arranged. Therefore, the other end of the brush 23 is always pressed against the other slip ring 20 by the spring force of the coil spring 26.

The brush holding member 24 is positioned on the inner peripheral surface of the boss 6a in the rotational direction by an appropriate means, and is held and fixed to the front housing 6 by a fixing means such as a screw.

One end of a lead wire (pigtail) 27, 28 on the positive electrode side and the negative electrode side is electrically connected to the brush 22 and the brush 23, respectively, and the other end of the lead wire 27, 28 is connected to the bottom surface of the brush holding member 24. 24c, the brush holding member 24 is taken out to the surface (the right end surface in FIG. 1) on the compressor 5 side of the brush holding member 24, and further passed through the front housing 6,
It is electrically connected to an external control circuit that interrupts the energization of the electromagnetic coil 2.

Next, a method of assembling the rotor 1 and the resin holding member 4 containing the electromagnetic coil 2 and the slip rings 19 and 20 according to the present embodiment will be described. First, the first part of the rotor is assembled to the compressor 5 side. In particular,
The outer ring 7 of the bearing 7 is provided on the inner peripheral surface of the inner cylindrical portion 1 b of the rotor 1.
a is press-fitted and fixed by an interference fit, and then the inner ring 7b of the bearing 7 is fitted to the outer peripheral surface of the boss 6a by a loose fit, and the inner ring 7b of the bearing 7 is fixed to the outer peripheral surface of the boss 6a by the circlip 14a. I do.

Next, the resin holding member 4 is assembled to the rotor 1. Specifically, the annular portion 4 of the resin holding member 4
1 is inserted into the concave portion 1d of the rotor 1, and at the same time, the arc-shaped groove 46 of the disk portion 40 of the resin holding member 4 is fitted to the tip 1b 'of the inner peripheral cylindrical portion 1b. Thereafter, the resin holding member 4 is fixed to the rotor 1 by the circlip 14b.

As described above, according to the present embodiment, the electromagnetic coil 2 and the slip ring 1
Since the parts 9 and 20 are integrated, only two steps of a step of assembling the rotor 1 part on the compressor 5 side and a step of assembling the resin holding member 4 on the rotor 1 side are required. Simplification can be achieved.

Here, a specific example of a method of manufacturing the resin holding member 4 will be described. First, the electromagnetic coil 2 is wound around the winding frame 3, and then the connecting pieces 19a of the slip rings 19 and 20 are connected.
The lead wires 15, 16 (FIG. 2) at the winding start end and winding end of the electromagnetic coil 2 are mechanically and electrically coupled to the terminal strips 19b, 20b of the 20a by caulking, soldering or other means. deep.

Next, the resin holding member 4 is completed by integrating the electromagnetic coil 2 and the slip rings 19 and 20 by resin molding by insert molding. In addition, the terminal pieces 19b, 20b of the slip rings 19, 20
The connection between the holding member 4 and the lead wires 15 and 16 at the winding start and end ends of the electromagnetic coil 2 may be performed after the resin molding of the holding member 4. In this case, it is necessary to provide an appropriate means for maintaining the winding state of the electromagnetic coil 2 in the electromagnetic coil 2 until the resin molding of the holding member 4 is completed.

As another example of the method of manufacturing the resin holding member 4, only the slip rings 19 and 20 are integrated with the resin holding member 4 in advance by resin molding using an insert molding technique. In this case, the shape of the annular portion 41 is
And the bobbin 3 is eliminated. Then, after the molding of the resin-made holding member 4 is completed, the electromagnetic coil 2 is wound around the winding frame-shaped portion of the annular portion 41, and thereafter, the terminal pieces 19 b and 20 b of the slip rings 19 and 20 are wound around the electromagnetic coil 2. Lead wire 1 at the beginning and end of winding
Combination with 5 and 16 may be performed.

Next, the operation of the above configuration will be described.
Since the rotor 1 is rotatably supported on the outer peripheral surface of the boss 6a of the front housing 6 by the bearing 7,
When an automobile engine (not shown) is operated, the rotation of the crank pulley of the engine is transmitted to the pulley 1a via a belt (not shown), and the rotor 1 constantly rotates. Therefore, the resin holding member 4 integrally assembled with the rotor 1 also rotates at all times.

Thus, the portion of the electromagnetic coil 2 and the portions of the slip rings 19 and 20 provided on the resin holding member 4 also rotate at all times. On the other hand, the brushes 22, 23, the brush holding member 24, the coil springs 25, 26, etc. are all held on the compressor 5 side (the boss 6a side) and do not rotate. Accordingly, one end faces in the axial direction of the brushes 22 and 23 are pressed against the rotating slip rings 19 and 20 by the spring force of the coil springs 25 and 26 to slide.

In order to operate the compressor 5 in the above state, the voltage of the vehicle-mounted power supply battery is applied to the lead wires (pigtails) 2 of the brushes 22 and 23 by an external control circuit (not shown).
When applied between 7, 28, the above-mentioned members (15, 16,
19, 20, 22, 23, 27, and 28), a current flows through the electromagnetic coil 2 via the current path.

Then, a magnetic flux flows in a magnetic circuit formed between the rotor 1 and the armature 8, so that an electromagnetic attraction force is generated between the friction surface 1e of the rotor 1 and the armature 8. Thus, the armature 8 resists the axial elastic force of the leaf spring 9 (force in the leftward direction in FIG. 1) against the friction surface 1 of the rotor 1.
e is sucked and adsorbed.

As a result, the rotor 1 and the armature 8 rotate integrally, and the armature 8 further rotates integrally with the hub 11 via the leaf spring 9 and the rivets 10a and 10b. Therefore, the rotary shaft 12 of the compressor 5 is
The rotation of the rotor 1 is transmitted to the compressor and the compressor 5 operates.

On the other hand, when the compressor 5 is stopped, the power supply to the electromagnetic coil 2 is cut off by the external control circuit. As a result, the electromagnetic attraction force disappears, so that the armature 8 separates from the friction surface 1e of the rotor 1 due to the axial elastic force of the leaf spring 9, and the rotation transmission to the rotating shaft 12 of the compressor 5 is interrupted. The compressor 5 stops.

(Other Embodiments) The tip of the inner cylindrical portion 1b of the rotor 1 and the outer cylindrical portion 1c
A friction plate made of an iron-based metal (ferromagnetic material) such as low-carbon steel is additionally installed between the tip portions of the clutch, and the number of poles of a magnetic circuit between the rotor 1 and the armature 8 is increased. The suction force may be increased.

The shapes of the brushes 22 and 23 are not limited to the above-mentioned arcuate cross section, but can be modified into various shapes. The positions of the brushes 22 and 23 are not limited to 180 ° symmetrical positions in the circumferential direction. Can be set freely.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an electromagnetic clutch showing one embodiment of the present invention.

FIG. 2 is a front view of a resin holding member 4 in FIG.

FIG. 3 is a sectional view of FIG. 2;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Rotor (drive side rotating member) 2: Electromagnetic coil, 4 ...
Resin holding member (assembled body), 5 ... Compressor (rotary machine),
6 front housing, 6a boss, 8 armature, 9 leaf spring (elastic connecting member), 11 hub (driven side rotating member), 12 rotating shaft, 19, 20 slip ring, 22, 23 ... Brush, 24: brush holding member.

Continued on the front page (72) Inventor: Yuichi Aoki 1-1-1, Showa-cho, Kariya-shi, Aichi Prefecture Inside Denso Corporation (72) Inventor Yasuo Tabuchi 1-1-1, Showa-cho, Kariya-shi, Aichi Prefecture Inside Denso Corporation

Claims (4)

[Claims] 1. A rotating member (1), an electromagnetic coil (2) that is electrically insulated from the rotating member (1), and generates an electromagnetic attraction force when energized, and is arranged to face the rotating member (1). And the rotating member (1) is driven by electromagnetic attraction generated by the electromagnetic coil (2).
An armature (8) adsorbed on the electromagnetic coil (2); a slip ring (19, 20) electrically connected to the electromagnetic coil (2); and a brush (22, 23) which is pressed against the slip ring (19, 20). The electromagnetic coil (2) is energized through the slip rings (19, 20) and the brushes (22, 23), and the armature (8) is attracted to the rotating member (1). An electromagnetic clutch for transmitting rotation from a rotary drive source and to a rotary shaft (12) of a rotary machine (5) via the armature (8); the slip ring (19, 20) portion and the electromagnetic coil (2); An assembly (4) in which parts are integrated in advance is provided, and the rotating member (1) is rotatably assembled to a housing (6) of the rotating machine (5) via a bearing (7). Later, the electromagnetic clutch, characterized in that assembling the assembly body (4) to said rotary member (1). 2. The boss portion (6a) which projects cylindrically outwardly of the housing (6) in the axial direction of the rotary machine (5).
And the rotation shaft (1) is provided at the center of the boss (6a).
2), and the brushes (22, 2) are provided on the inner peripheral side of the boss (6a).
3. The electromagnetic clutch according to claim 1, wherein said slip ring and said slip ring are arranged. 3. The assembly according to claim 1, wherein said assembly (4) has said slip ring (19, 20) portion and said electromagnetic coil (2) portion integrated by resin molding. Electromagnetic clutch. 4. The method for assembling an electromagnetic clutch according to claim 1, wherein the slip ring (19, 20) portion and the electromagnetic coil (2) portion are assembled into one. A step of integrating as a body (4), a step of rotatably mounting the rotating member (1) to a housing (6) of the rotary machine (5) via a bearing (7), and after the mounting step Assembling the assembly (4) to the rotating member (1).