JP2011002021A - Electromagnetic clutch, compressor, and manufacturing method of electromagnetic clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase a contact area of an armature and a rotor without dramatically increasing the cost for increasing the attraction of the armature and the rotor.SOLUTION: When grooves 44, 45A, 45B of the armature 42 and the rotor 43 are formed by laser machining, a metal oxide layer 100 is formed on a wall surface which defines the grooves 44, 45A, 45B. The metal oxide layer 100 is brought into sliding contact with a first contact surface A1 to a fourth contact surface A4 during use of an electromagnetic clutch, so that a part of the metal oxide layer 100 is ground or separated whereby particles composed of a metal oxide are generated. The particles enter a contact surface between the armature 42 and the rotor 43, so that the friction force therebetween is increased to thereby prevents slippage. As a result, the torque transmission capacity of an electromagnetic clutch M is enhanced and the increase of the torque of a scroll compressor is achieved.

Description

  The present invention relates to an electromagnetic clutch that is applied to, for example, a vehicle air conditioner and transmits power, a compressor including the electromagnetic clutch, and a method for manufacturing the electromagnetic clutch.

2. Description of the Related Art Conventionally, a compressor used in a vehicle air conditioner includes an electromagnetic clutch that is disposed between a drive source and transmits power.
The electromagnetic clutch can be selected by transmitting or not transmitting power by electromagnetic force. For example, the armature 2 is attracted to the rotor 3 by the magnetic force of the electromagnetic coil 1 as shown in FIG. And the rotor 3 are integrally coupled to transmit power (see, for example, Patent Document 1). In the illustrated configuration example, the radial width of the armature 2 is divided into two parts, and the radial width of the rotor 3 is divided into three parts, so that the contact surface (gap) 4 between the armature 2 and the rotor 3 is in the radial direction. Divided into four. In the following description, the contact surface 4 on the rotor 3 side is referred to as an armature contact surface 4a, and the armature 2 side is referred to as a rotor contact surface 4b.

The armature contact surface 4a of the rotor 3 is divided into three radial directions by two grooves 5 having a groove width a as shown in FIG. 6 (a), for example, an inner ring 3a, a center ring 3b, An outer ring 3c is formed. The two grooves 5 are divided at a plurality of locations in the circumferential direction by a bridge 6 that connects the inner ring 3a, the center ring 3b, and the outer ring 3c.
Also in the radial direction of the armature 2, as shown in FIG. 6B, for example, the armature 2 is divided into an inner peripheral portion 2a and an outer peripheral portion 2b by a groove 7 having a groove width b. And also about the groove | channel 7 by the side of the armature 2, the circumferential direction is parted by the bridge 8 which connects the inner peripheral part 2a and the outer peripheral part 2b in several places. The armature 2 in this case is composed of a plate punched from a plate material by punching.

JP 2003-314484 A

  In the conventional electromagnetic clutch described above, when a sufficient attractive force cannot be secured between the armature 2 and the rotor 3 due to a short-circuit magnetic flux flowing through the bridges 6 and 8, the margin of torque transmission capability is reduced. That is, there is a problem that a slip trouble occurs between the armature 2 and the rotor 3 when the margin of the torque transmission capability is reduced due to insufficient suction force.

  Therefore, it is conceivable to increase the frictional force by increasing the contact area between the armature 2 and the rotor 3. For this, it is conceivable to increase the outer diameters of the armature 2 and the rotor 3, but this is not preferable because the outer diameter of the electromagnetic clutch increases and the size increases.

  The present invention has been made on the basis of such a technical problem, and an electromagnetic clutch capable of increasing the frictional force between the armature and the rotor without increasing the outer dimension of the battery clutch. It is an object of the present invention to provide a compressor and a method for manufacturing the electromagnetic clutch.

  The present invention made for this purpose is an electromagnetic clutch in which the armature is attracted to the contact surface of the rotor by the magnetic force of the electromagnetic coil, and the armature and the rotor are integrally coupled to transmit power. The rotor side groove is divided in the radial direction, and the rotor contact surface of the armature is divided by the armature side groove, and a metal oxide layer is formed on at least one surface of the wall surface defining the rotor side groove and the wall surface defining the armature side groove. It is formed. In the following, the metal oxide layer formed on the wall surface defining the rotor side groove is abbreviated as the rotor side oxide layer, and the metal oxide layer formed on the wall surface defining the armature side groove is abbreviated as the armature side oxide layer. Sometimes.

  By using the electromagnetic clutch configured as described above, the armature contact surface of the rotor and the rotor contact surface of the armature are slidably contacted and worn, and accordingly, the armature-side oxide is formed on the armature contact surface of the rotor. The layers are in sliding contact, and the rotor side oxide layer is in sliding contact with the rotor contact surface of the armature. Therefore, a part of these metal oxide layers is crushed or peeled (hereinafter collectively referred to as crushed) to produce metal oxide particles, which are supplied to the armature contact surface of the rotor or the rotor contact surface of the armature. . Accordingly, it is possible to suppress slippage by increasing the frictional force between the armature and the rotor without increasing the outer dimension.

  The metal oxide layer preferably has a thickness of 0.1 μm to 10 μm. Furthermore, it is preferable that the Vickers hardness of the rotor and the armature is 100HV10 to 350HV10, and the Vickers hardness of the metal oxide layer is 700HV0.003 to 1200HV0.003. As described above, since the Vickers hardness of the metal oxide layer is high, particles generated from the metal oxide layer enter between the armature and the rotor that are in contact with each other by a suction force, and the space between the armature and the rotor is reduced. The frictional force can be increased and slippage can be suppressed.

  Furthermore, it is preferable that the width of the groove formed on the rotor contact surface of the armature is 0.8 to 1.2 mm. As a result, the contact area between the rotor and the armature can be increased without increasing the size of the electromagnetic clutch, thereby increasing the attractive force. Accordingly, the frictional force between the armature and the rotor can be increased to suppress the slip.

  Further, the above-described electromagnetic clutch can be provided so as to be attached to the shaft portion of the compression mechanism and transmit power.

  Furthermore, in the electromagnetic clutch manufacturing method according to the present invention, the armature is attracted to the contact surface of the rotor by the magnetic force of the electromagnetic coil, and the armature and the rotor are integrally coupled to transmit power, and the armature contact surface of the rotor is In the manufacturing method of the electromagnetic clutch in which the rotor contact surface of the armature is divided by the side groove and the rotor contact surface of the armature is divided by the armature side groove. A metal oxide layer is formed on one of the surfaces. In this electromagnetic clutch manufacturing method, it is preferable to form the metal oxide layer when forming at least one of the rotor side groove and the armature side groove by laser processing for forming the metal oxide. Further, during the laser processing, it is preferable to blow oxygen to the irradiation position of the laser beam, that is, the rotor side groove or the armature side groove.

  According to such an electromagnetic clutch manufacturing method, since laser light is used, fine grooves (rotor side grooves, armature side grooves) can be formed in the armature and the rotor, and heat generated by laser light irradiation can be used to form the grooves. A metal oxide layer can be easily formed simultaneously with the formation. Further, when oxygen gas is blown to the laser irradiation position, melting of the cut portion is promoted by oxidation reaction heat, so that the groove processing speed can be increased.

  According to the present invention, by using the electromagnetic clutch, the armature-side oxide layer that is in sliding contact with the armature contact surface of the rotor and the rotor-side oxide layer that is in sliding contact with the rotor contact surface of the armature become particles, and the armature of the rotor Supplied to the contact surface and the rotor contact surface of the armature. As a result, the frictional force between the armature and the rotor can be increased and slippage can be suppressed.

It is a longitudinal section showing an example of composition of a scroll type compressor provided with an electromagnetic clutch in this embodiment. It is a perspective sectional view of an electromagnetic clutch. (A) is a top view of an armature, (b) is a top view of a rotor. It is an expanded sectional view which shows the contact part of an armature and a rotor. It is a perspective sectional view of a conventional electromagnetic clutch, and an enlarged sectional view showing a contact portion between an armature and a rotor. (A) is a top view of the conventional rotor, (b) is a top view of the conventional armature. It is a cross-sectional photograph of the groove part of an armature. It is a graph which shows the result of having measured the surface of the metal oxide layer 100 shown in FIG. 7 by micro Vickers.

Hereinafter, an embodiment of an electromagnetic clutch according to the present invention and a compressor including the electromagnetic clutch will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing a configuration example of a scroll compressor provided with an electromagnetic clutch. The scroll compressor (compressor) 10 includes a front housing 11 and a rear housing 12, and includes a housing 13 in which the front housing 11 and the rear housing 12 are integrally fastened and fixed by bolts (not shown). ing.

Inside the front housing 11, a crankshaft (rotary shaft) 14 is rotatably supported around a rotation axis L via a main bearing (needle bearing) 15 and a sub-bearing (needle bearing) 16. One end side (the left side in FIG. 1) of the crankshaft 14 is a small diameter shaft portion 14a, and the small diameter shaft portion 14a penetrates the front housing 11 and protrudes to one end side. An electromagnetic clutch M is mounted on the protruding portion of the small-diameter shaft portion 14a, and between the pulley 18 provided rotatably on the outer peripheral surface of the small-diameter boss portion 11a on one end side of the front housing 11 via a bearing 17. The power is intermittent. Power is transmitted to the pulley 18 from an external drive source such as an engine (not shown) via a V-belt or the like.
Note that a mechanical seal (lip seal) 19 is provided between the main bearing 15 and the sub-bearing 16, thereby hermetically sealing the inside of the housing 13 and the atmosphere.

On the other hand, a large-diameter shaft portion 14 b is provided on the other end side (right side in FIG. 1) of the crankshaft 14, and the large-diameter shaft portion 14 b has a predetermined dimension from the rotation axis L of the crankshaft 14. An eccentric pin 14c is integrally provided in an eccentric state. The large-diameter shaft portion 14b and the small-diameter shaft portion 14a of the crankshaft 14 are rotatably supported by the front housing 11 via the main bearing 15 and the sub bearing 16, respectively.
Further, the orbiting scroll member 22 is connected to the eccentric pin 14c via the balance bush 20 and the drive bearing 21, and the orbiting scroll member 22 is driven to rotate by rotating the crankshaft 14. It has become.

The balance bush 20 is formed with a balance weight 20a for removing an unbalanced load generated when the orbiting scroll member 22 is orbitally driven. The balance weight 20a is orbited when the orbiting scroll member 22 is orbitally driven. Yes.
Inside the housing 13, a pair of fixed scroll portions 24 and a turning scroll member 22 constituting a scroll type compression mechanism 23 are incorporated.
The fixed scroll member 24 includes a fixed end plate 24a and a spiral wrap 24b erected from the fixed end plate 24a. On the other hand, the orbiting scroll member 22 includes the orbiting end plate 22a and the orbiting end plate. And a spiral wrap 22b erected from 22a.

  The fixed scroll member 24 and the orbiting scroll member 22 are assembled in a state where the centers of the fixed scroll member 24 and the orbiting scroll member 22 are separated by the orbiting radius and the spiral wraps 24b and 22b are engaged with each other with a phase difference of 180 degrees. As a result, a pair of compression chambers C defined by the end plates 24a and 22a and the spiral wraps 24b and 22b are formed symmetrically with respect to the scroll center between the scroll members 24 and 22. Will be.

The fixed scroll member 24 is fixed to the inner surface (bottom surface) of the rear housing 12 via a bolt 25. In the orbiting scroll member 22, an eccentric pin 14 c provided on one end side of the crankshaft 14 is fitted into a boss portion 26 provided on the back surface of the orbiting end plate 22 a via a balance bush 20 and a drive bearing 21. Thus, the crankshaft 14 is connected.
Further, the orbiting scroll member 22 has a thrust receiving surface 11b formed on the front housing 11 supported on the back surface of the orbiting end plate 22a, and the orbiting scroll member 22 is interposed between the thrust receiving surface 11b and the orbiting scroll member 22 on the back surface. The orbiting scroll member 22 is configured to be revolved and driven with respect to the fixed scroll member 24 while being prevented from rotating by the rotation-preventing pinning mechanism 27 mounted.

This rotation-preventing pin ring mechanism 27 includes a pin 27a and a ring 27b, and a pin hole 11c for standing the pin 27a on one of the back surface of the fixed end plate 22a of the orbiting scroll member 22 and the thrust receiving surface 11b is provided on the other side. Is provided with a ring hole 22c for fitting the ring 27b. In the present embodiment, the thrust receiving surface 11 b is provided with a pin hole 11 c for standing the pin 27 a, and the orbiting scroll member 22 is provided with a ring hole 22 c for fitting the ring 27 b.
The pin holes 11c and the ring holes 22c are provided at a plurality of locations in the circumferential direction, generally 3 to 4 locations (4 locations in the present embodiment).

Further, a discharge port 24c for discharging compressed refrigerant gas is opened at the center of the fixed end plate 24a of the fixed scroll member 24. The discharge port 24c is connected to the fixed end plate 24a via a retainer 28. A discharge reed valve (not shown) is provided.
Further, a seal member (not shown) such as an O-ring is installed on the back surface of the fixed end plate 24 a of the fixed scroll member 24 so as to be in close contact with the inner surface of the rear housing 12. A discharge chamber 29 partitioned from the internal space (sealed space) is formed. Thereby, the internal space of the housing 13 excluding the discharge chamber 29 functions as the suction chamber 30.

Refrigerant gas returning from the refrigeration cycle is sucked into the suction chamber 30 via a suction port (not shown) provided in the front housing 11, and the fixed scroll member 24 and the orbiting scroll member are passed through the suction chamber 30. The refrigerant gas is sucked into the compression chamber C formed between the two.
A sealing member 31 such as an O-ring is installed on the joint surface between the front housing 11 and the rear housing 12, and the suction chamber 30 in the housing 13 is hermetically sealed from the atmosphere.

The scroll compressor 10 configured as described above operates as follows.
The rotational driving force transmitted from the external drive source to the pulley 18 is transmitted to the crankshaft 14 via the electromagnetic clutch M, and the crankshaft 14 is rotated. Then, the orbiting scroll member 22 connected to the eccentric pin 14c of the crankshaft 14 via the balance bush 20 and the drive bearing 21 is prevented from rotating by the rotation preventing pin ring mechanism 27 while being rotated against the fixed scroll member 24. Revolved and driven.

  The revolving orbiting drive of the orbiting scroll member 22 causes the refrigerant gas in the suction chamber 30 to be sucked into the compression chamber C formed at the outermost side in the radial direction. After the compression chamber C is closed by suction at a predetermined swivel angle position, the compression chamber C is moved to the center side while the volume is reduced in the circumferential direction and the lap height direction. During this time, the refrigerant gas is compressed, and when the compression chamber C reaches a position communicating with the discharge port 24c, the discharge reed valve is pushed open and the compressed gas is discharged into the discharge chamber 29. It is discharged out of the compressor through a discharge port (not shown) provided in the rear housing 12.

  The scroll compressor 10 described above includes an electromagnetic clutch M that is mounted on the crankshaft 14 of the compression mechanism and transmits power. The electromagnetic clutch M attracts the magnetic armature 42 to the contact surface of the rotor 43 by the magnetic force of the electromagnetic coil 41, and transmits the power by integrally coupling the armature 42 and the rotor 43.

  In the electromagnetic clutch M of the present embodiment, for example, as shown in FIGS. 2 and 3A, the radial direction of the armature 42 is divided into two by a groove (intermediate groove) 44 having a width b, and an inner ring 42a, An outer peripheral ring 42b is formed. The groove 44 is divided at a plurality of locations in the circumferential direction by a bridge 50 that connects the inner ring 42a and the outer ring 42b. The grooves 44 divided by the bridge 50 each form an arc having the same width with the groove width being b. In addition, although mentioned later in detail, in this Embodiment, the groove | channel 44 and the groove | channels 45A and 45B demonstrated below are formed by laser processing.

  In addition, as shown in FIGS. 2 and 3B, for example, the electromagnetic clutch M of the present embodiment includes two grooves (inner circumferential grooves) 45A and grooves (outer circumferences) in which the radial direction of the rotor 43 has a width a. Groove) 45B, and is divided into three to form an inner ring 43a, a center ring 43b, and an outer ring 43c. The two grooves 45A and 45B are divided at a plurality of locations in the circumferential direction by bridges 51A and 51B connecting the inner ring 43a, the center ring 43b, and the outer ring 43c. The grooves 45A and 45B divided by the bridges 51A and 51B each form an arc having the same width with the groove width being a. In addition, as for the width | variety of the above-mentioned groove | channel 44, 45A, 45B, 0.8-1.2 mm is preferable. This is because the contact area between the rotor and the armature can be increased without increasing the size of the electromagnetic clutch itself, and the occurrence of a short circuit in the magnetic flux on both sides of the grooves 44, 45A, 45B can be suppressed.

  As shown in FIG. 4, the grooves 44, 45 </ b> A and 45 </ b> B formed in this way allow the rotor contact surface 46 a of the armature 42 and the armature contact surface 46 b of the rotor 43 to be connected to the inner peripheral ring 43 a of the rotor 43. An annular first contact surface A1 facing the inner ring 42a, an inner second ring A2 of the armature 42 facing the center ring 43b of the rotor 43, and an outer ring 42b of the armature 42 are the rotor. The annular third contact surface A3 facing the central ring 43b of 43 and the annular fourth contact surface A4 of the outer ring 43c of the rotor 43 facing the outer ring 42b of the armature 42 generate a suction force.

  Here, the first contact surface A1, the second contact surface A2, the third contact surface A3, and the fourth contact surface A4 are configured so that the areas of the annular areas are substantially equal to each other so that the suction force is equalized. It is preferable to form the grooves 44, 45A, 45B. Further, in order to increase the force against the rotational torque when the armature 42 and the rotor 43 are attracted to each other, of the first contact surface A1, the second contact surface A2, the third contact surface A3, and the fourth contact surface A4, The area of the fourth contact surface A4 on the outer periphery may be maximized.

In the present embodiment, a metal oxide layer 100 is formed on the surface of the wall surface that partitions each of the grooves 44, 45A, 45B.
The metal oxide layer 100 formed on the wall surface defining the groove 44 is formed from the upper end edge to the lower end edge of the groove 44. The portion formed at the lower edge of the metal oxide layer 100 is in contact with the second contact surface A2 and the third contact surface A3.
The metal oxide layer 100 formed on the wall surface defining the groove 45A is formed from the upper end edge to the lower end edge of the groove 45A. The portion formed at the upper edge of the metal oxide layer 100 is in contact with the first contact surface A1 and the second contact surface A2.
The metal oxide layer 100 formed on the wall surface defining the groove 45B is formed from the upper end edge to the lower end edge of the groove 45B. The portion formed at the upper edge of the metal oxide layer 100 is in contact with the third contact surface A3 and the fourth contact surface A4.
The metal oxide layer 100 only needs to be provided with a thickness of 0.1 μm to 10 μm. However, as will be described later, the metal oxide layer 100 is preferably 0.5 to 3 μm thick. Here, FIG. 7 shows a cross-sectional photograph of the vicinity of the groove 44 of the armature 42. In order to form the metal oxide layer 100 shown in FIG. 7, a 4.5 mm-thick mild steel material (SPHC: hot rolled steel plate) was formed using a CO ₂ laser with an output of 2500 W at a speed of 3.5 m / min. 44 was processed and formed. As shown in the figure, a metal oxide layer 100 having a thickness of about 0.5 μm to 3 μm is attached to the surface of the wall surface defining the groove 44 of the armature 42. This is because the metal oxide particles generated by being crushed from the metal oxide layer 100 by the sliding contact between the armature 42 and the rotor 43 are likely to be about 0.1 μm to 1 μm. Note that there may be a portion where the metal oxide layer 100 is not attached to the surface of the groove 44. Most preferably, the metal oxide layer is provided with a thickness of about 1 μm. However, the object of the present invention can be achieved if a part of the metal oxide layer is deposited in a thickness of 0.1 μm to 10 μm.

Further, FIG. 8 shows the result of measuring the surface of the metal oxide layer 100 shown in FIG. 7 by micro Vickers. In this example, the load was 3 gf, the Vickers hardness was about 1000 (in the present specification, it is shown as 1000 HV0.003, and the others are the same), and the values were about 650HV0.005 and 500HV0.010. This is because when the load becomes heavy, the mild steel material on the surface of the armature also affects the measured value. Note that it is only necessary that the Vickers hardness of the armature 42 is 100 HV10 to 350 HV10 and the laser light is irradiated so that the Vickers hardness of the metal oxide layer 100 is 700HV0.003 to 1200HV0.003. However, the most preferable Vickers hardness of the metal oxide layer 100 is about 1000 ± 100HV0.003.
Although the groove 44 of the armature 42 has been described above, it is preferable to similarly form the metal oxide layer 100 for the grooves 45A and 45B of the rotor 43 as well.
The metal oxide layer 100 is not called hydrous iron oxide Fe ₂ O ₃ H ₂ O but a triiron tetroxide (Fe ₃ O ₄ ) generated by high-temperature oxidation and is commonly called “black skin”. Is.

In such an electromagnetic clutch, the rotor contact surface 46a and the armature contact surface 46b are in sliding contact with each other at the first contact surface A1, the second contact surface A2, the third contact surface A3, and the fourth contact surface A4. Wear.
In this process, the metal oxide layer 100 facing the upper edge of the groove 44 formed on the wall surface defining the groove 44 is in sliding contact with the second contact surface A2 and the third contact surface A3, and is crushed into fine particles. .
The same applies to the groove 45A and the groove 45B. The groove 45A is slid with the first contact surface A1 and the second contact surface A2, and the groove 45B is slid with the third contact surface A3 and the fourth contact surface A4. By the contact, particles are generated from the metal oxide layer 100.
And the fine particle produced | generated from the metal oxide layer 100 becomes a particle size of about 0.1-1 micrometer, for example, 1st contact surface A1, 2nd contact surface A2, 3rd contact surface A3, 4th contact. Enter surface A4. Since the metal oxide layer 100 is formed from the upper end edge to the lower end edge of the grooves 44, 45A, 45B, as long as the electromagnetic clutch M is used, the particles can be continuously supplied to the contact surface.

  Further, when the particle size of the generated particles is relatively large, for example, even if it is about 5 μm, the first contact surface A1, the second contact surface A2, the third contact surface A3, the fourth contact surface A4, respectively. The first contact surface A1, the second contact surface A2, the third contact surface A3, and the fourth contact surface A4 enter the first contact surface A1, the second contact surface A2, and the fourth contact surface A4. Particles made of the metal oxide layer that have entered the respective contact surfaces A1 to A4 act as resistance at the contact surfaces, increase the frictional force between the rotor 43 and the armature 42, and between the rotor 43 and the armature 42. Slip can be suppressed. Further, since the particles of the metal oxide layer 100 are supplied one after another as the rotor 43 and the armature 42 wear, the particles of the metal oxide layer 100 are constantly supplied between the rotor 43 and the armature 42. I can do it. The metal oxide layer 100 can achieve the above-described effects even if it is formed in any one of the grooves 44, 45A, and 45B.

  The grooves 44, 45A, 45B are formed by laser processing. In laser processing, the plate material is cut (fused) into a predetermined shape by moving the laser beam, the armature 42, and the rotor 43 relative to each other while irradiating the plate material forming the armature 42 and the rotor 43 with laser light. Thus, the grooves 44, 45A and 45B are formed. Although it is possible to form the metal oxide layer 100 only by laser light irradiation, more preferably, oxygen is blown to the laser irradiation light position. Thereby, the metal oxide layer 100 can be formed efficiently. Blowing oxygen also increases the cutting speed.

  Further, by forming the grooves 44, 45A, 45B by laser processing, the inner peripheral surfaces of the grooves 44, 45A, 45B are hardened by heat input by the laser beam, and the hardness of the base material of the armature 42 and the rotor 43 is increased. It is larger than the hardness. As a result, it is possible to increase the strength of the wall surfaces that define the grooves 44, 45A, 45B.

  Here, for example, the armature 42 and the rotor 43 described above may be made of soft steel such as SPHC (hot rolled steel plate) and SPCC (cold rolled steel plate), or low carbon steel such as S12C. This is because the steel material increases in hardness when the carbon content is increased, but on the other hand, the ferrite phase decreases and the magnetic flux density (magnetic permeability) of the electromagnetic clutch decreases.

In addition, although the said embodiment demonstrated the structure of the scroll compressor 10, about the structure of other parts other than the structure relevant to the principal part of this invention, it does not limit at all. The same applies to the electromagnetic clutch M.
In addition to this, as long as it does not depart from the gist of the present invention, the configuration described in the above embodiment can be selected or changed to another configuration as appropriate.

  DESCRIPTION OF SYMBOLS 10 ... Scroll type compressor (compressor), 41 ... Electromagnetic coil, 42 ... Armature, 42a ... Inner ring, 42b ... Outer ring, 43 ... Rotor, 43a ... Inner ring, 43b ... Central ring, 43c ... Outer ring 44 ... groove (intermediate groove), 45A ... groove (inner circumferential groove), 45B ... groove (outer circumferential groove), 46a ... rotor contact surface, 46b ... armature contact surface, 100 ... metal oxide layer, A1 ... first contact Surface, A2 ... second contact surface, A3 ... third contact surface, A4 ... fourth contact surface, M ... electromagnetic clutch

Claims (7)

In the electromagnetic clutch that attracts the armature to the contact surface of the rotor by the magnetic force of the electromagnetic coil and transmits the power by integrally coupling the armature and the rotor,
The armature contact surface of the rotor is divided in the radial direction by the rotor side groove,
The rotor contact surface of the armature is divided in the radial direction by the armature side groove,
An electromagnetic clutch, wherein a metal oxide layer is formed on at least one surface of a wall surface defining the rotor side groove and a wall surface defining the armature side groove.   The electromagnetic clutch according to claim 1, wherein the metal oxide layer has a thickness of 0.1 μm to 10 μm.   The electromagnetic clutch according to claim 1 or 2, wherein the rotor and the armature have a Vickers hardness of 100HV10 to 350HV10, and the metal oxide layer has a Vickers hardness of 700HV0.003 to 1200HV0.003.   The electromagnetic clutch according to any one of claims 1 to 3, wherein a width of the groove formed on the rotor contact surface of the armature is 0.8 to 1.2 mm.   A compressor comprising the electromagnetic clutch according to any one of claims 1 to 4, which is mounted on a shaft portion of a compression mechanism and transmits power. The armature is attracted to the contact surface of the rotor by the magnetic force of the electromagnetic coil, and the armature and the rotor are integrally coupled to transmit power,
The armature contact surface of the rotor is divided in the radial direction by the rotor side groove,
In the electromagnetic clutch manufacturing method in which the rotor contact surface of the armature is radially divided by the armature side groove,
A method of manufacturing an electromagnetic clutch, comprising: forming a metal oxide layer on at least one surface of a wall surface defining the rotor side groove and a wall surface defining the armature side groove by laser processing.   The method for manufacturing an electromagnetic clutch according to claim 6, wherein oxygen is blown to a laser beam irradiation position during the laser processing.

Images