JP2006132687A - Bearing with sensor, pulley using the same, and electromagnetic clutch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing with a sensor, a pulley using the same, and an electromagnetic clutch capable of reducing or eliminating the disagreement between a center of a belt and a center of the bearing in being used to support an offset-type pulley or the like, elongating service life of the bearing, and storing a sensor device in compact. <P>SOLUTION: This bearing 1 with the sensor is applied to a double row angular ball bearing, and a central position C between rolling faces 5, 6 of both rows is axially deflected to a central position of an axial width of inner and outer rings 2, 3. A sensor mounting space S capable of incorporating components of the sensor device 11 is formed at an end side with respect to the rolling faces 5, 6 between the inner and outer rings 2, 3 at an anti-deflection side, and the sensor device 11 is incorporated in the sensor mounting space S to detect relative rotation of the inner and outer rings 2, 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a bearing with a sensor in which a rotation sensor function is added to an outer ring rotary bearing used in belt driving, such as a bearing of a car air conditioner electromagnetic clutch section, and a pulley and an electromagnetic clutch using the same.

In general, a lock sensor is attached to an electromagnetic clutch for car air conditioner or a peripheral device in order to control on / off of the electromagnetic clutch in accordance with an engine state, a running state, and a compressor body state. By taking the output signal of this sensor into the control unit, slippage of the accessory belt or the drive belt is detected. As the lock sensor, for example, a rotation sensor or the like provided at the casing end of the compressor or the like for detecting the rotation of the drive shaft is used. In this type of electromagnetic clutch, a pulley in which a rotating member to be hung on a belt is fixed to an outer ring of a rolling bearing is used, and a rotatable driven member is attracted to the rotating member by an electromagnetic force of a coil (for example, Patent Document 1). As the rolling bearing that supports the rotating member, a double-row angular ball bearing or a single-row multi-point contact ball bearing is used.
Further, a rolling bearing with a built-in rotation sensor has been proposed (for example, Patent Document 2).
Japanese Unexamined Patent Publication No. 2000-170752 JP 2003-240007 A

Normally, single row or double row ball bearings incorporated in pulleys or electromagnetic clutches are incorporated so that the center of the timing belt is at the center between the rows (in the case of a single row bearing, the center of the rolling element). However, recently, from the viewpoint of reducing the installation space in order to ensure the coil capacity of the electromagnetic clutch, or from the problem of arranging the engine and auxiliary machinery group, the center of the auxiliary belt or the driving belt, There is an increasing demand for offset pulleys that are intentionally offset from the center of the pulley.
However, as shown in FIG. 7, when a conventional bearing 61 used in the past is incorporated in the offset pulley 60, the center C2 in the width direction of the timing belt 62 and the center Co between the rows of the bearings 61 are arranged in a shifted state. For this reason, in the double row bearing, the load applied to the one-side rolling surface is increased. In single row bearings, the load applied at a position away from the contact ellipse is increased. As a result, there are problems in that the life of the bearing 61 is reduced and the occurrence rate of bearing damage due to the contact ellipse being detached from the rolling surface is increased.

  The object of the present invention is to reduce or eliminate the load unevenness on the rolling surface when used in a load-biased state such as support of an offset type pulley, etc., to improve the bearing life and to rotate A bearing with a sensor capable of accommodating a sensor device for detection in a compact manner, and a pulley and an electromagnetic clutch using the same.

The sensor-equipped bearing according to the first aspect of the present invention is a double-row angular contact ball bearing, wherein the center position between the rolling surfaces of both rows is axially biased with respect to the center position of the axial width of the inner and outer rings. A sensor arrangement space capable of incorporating sensor components on the end side of the rolling surface between the inner and outer rings on the opposite side, and a sensor for detecting relative rotation between the inner and outer rings in the sensor arrangement space It has a built-in device.
According to this configuration, since the center position between the rolling surfaces of both rows is offset in the axial direction with respect to the center position of the axial width of the inner and outer rings, for example, a pulley in which the belt center is offset from the pulley center. When this sensor-equipped bearing is incorporated as an offset type pulley bearing, the amount of deviation between the center of the belt and the center of the bearing can be reduced or eliminated by offsetting the deviation. Therefore, it is possible to reduce the load load from being biased to one of the rows, and to obtain a life extension effect of the bearing. If the load is not limited to the offset type pulley but the load is biased depending on the axial position of the bearing, the load load is less biased to one row as described above, and the life extension effect of the bearing can be obtained. In addition, a sensor arrangement space is provided on the end side of the rolling surface between the inner and outer rings on the opposite side of the rolling surface, and the sensor device is built in. Therefore, the sensor device is built in compactly by efficiently using the bearing width. can do.

The sensor-equipped bearing according to the second aspect of the present invention is a multi-point contact ball bearing, wherein the center position of the rolling element is axially biased with respect to the center position of the axial width of the inner and outer rings, The sensor arrangement space that can contain the sensor components is provided on the end side of the rolling surface between the inner and outer rings in the sensor, and the sensor device that detects the relative rotation between the inner and outer rings is built in this sensor arrangement space. It is characterized by.
According to this configuration, in the multi-point contact ball bearing, since the center position of the rolling element is biased in the axial direction with respect to the center position of the axial width of the inner and outer rings, for example, the belt center is biased from the pulley center. When this sensor-equipped bearing is incorporated as a bearing of an offset type pulley that is a pulley, the amount of deviation between the center of the belt and the center of the rolling element can be reduced or eliminated by offsetting the amount of deviation. For this reason, the uneven load is reduced, the excessive load on the bearing due to the contact ellipse, which is the stress ellipse generated on the rolling surface, coming off the shoulder of the grooved rolling groove is reduced, and the life extension effect of the bearing is reduced. Obtainable. Not only the offset type pulley but also a usage pattern in which the load is biased depending on the axial position of the bearing, it is possible to reduce the load load from being extremely biased on the rolling surface in the same manner as described above, and to obtain the life extension effect of the bearing. it can. In addition, a sensor arrangement space is provided on the end side of the rolling surface between the inner and outer rings on the opposite side of the rolling surface, and the sensor device is built in. Therefore, the sensor device is built in compactly by efficiently using the bearing width. can do. That is, since it is possible to provide both a rotation speed detection function and a bearing function in a single housing, it is possible to reduce the size, weight, simplification, and ease of assembly of a bearing-using device.

In the first and second aspects of the present invention, a mark for determining which side of the bias side is the axial direction may be provided.
If the mark is provided, when the sensor-equipped bearing is incorporated as an offset pulley bearing, the sensor-equipped bearing can be easily incorporated so that the sensor device faces the side where the pulley is biased.

The sensor-equipped space-equipped bearing according to the present invention is the sensor-equipped bearing according to the first or second aspect of the present invention, in which the sensor device is not incorporated.
The sensor-equipped space-equipped bearing with this configuration incorporates the sensor device and is used as the sensor-equipped bearing according to the first invention or the second invention.

The pulley according to the present invention includes the sensor-equipped bearing according to any one of the configurations of the present invention, and an outer ring of the sensor-equipped bearing is fixed to a rotating member that is belt-mounted.
According to this configuration, the above-described effects of the sensor-equipped bearing of the present invention are effectively exhibited.

An electromagnetic clutch according to the present invention includes a pulley in which a rotating member to be hung on a belt is fixed to an outer ring of a rolling bearing, a coil that generates an electromagnetic force when energized, and a rotatable driven member, and the electromagnetic force generated by the coil. The electromagnetic clutch transmits the rotation of the rotating member to the driven member by adsorbing the rotating member of the pulley and the driven member, and the pulley having any one of the configurations of the present invention is used as the pulley. And
According to the electromagnetic clutch of this configuration, the rotation speed signal of the sensor device in the sensor-equipped bearing can be used as a substitute for the lock sensor for on / off control, and the above-described effects of the sensor-equipped bearing of the present invention are effectively exhibited. .

The sensor-equipped bearing according to the first aspect of the present invention is a double-row angular contact ball bearing, wherein the center position between the rolling surfaces of both rows is axially biased with respect to the center position of the axial width of the inner and outer rings. A sensor arrangement space capable of incorporating sensor components on the end side of the rolling surface between the inner and outer rings on the opposite side, and a sensor for detecting relative rotation between the inner and outer rings in the sensor arrangement space The built-in device reduces or eliminates the load bias on the rolling surface when used in a load-biased state, such as when supporting an offset pulley, etc., improving bearing life and detecting rotation. Therefore, the sensor device can be accommodated in a compact manner.
The sensor-equipped bearing according to the second aspect of the present invention is a multi-point contact ball bearing, wherein the center position of the rolling element is axially biased with respect to the center position of the axial width of the inner and outer rings, Since a sensor arrangement space capable of incorporating sensor components is provided on the end side of the rolling surface between the inner and outer rings in the sensor, a sensor device that detects relative rotation between the inner and outer rings is built in the sensor arrangement space. It is possible to reduce or eliminate the load bias on the rolling surface, improve the bearing life, and accommodate the sensor device for detecting rotation in a compact manner.

  A first embodiment of the present invention will be described with reference to FIG. The sensor-equipped bearing 1 of this embodiment is a rolling bearing, and includes an inner ring 2, an outer ring 3, and a plurality of rolling elements 4 interposed between the inner and outer rings 2, 3. A sensor device 11 for detecting relative rotation is incorporated. The rolling bearing 1 is composed of a double row angular ball bearing, the inner ring 2 has two rows of rolling surfaces 5 on the outer periphery thereof, and the outer ring 3 runs opposite to the rolling surfaces 5 of each row of the inner ring 2. The rolling element 4 is interposed between the rolling surfaces 5 and 6 of each row | line | column which has the surface 6 and opposes.

  The center position C between the rolling surfaces 5 and 6 in both rows is axially biased with respect to the center position of the axial width of the inner and outer rings 2 and 3. The rolling elements 4 in each row are held by a cage 7, and both ends of the bearing space between the inner and outer rings 2 and 3 are sealed by contact bearing seals 8 and 9. The anti-bias side bearing seal 9 is provided farther inward than the width surface of the inner and outer rings 2, 3, and on the end side of the rolling surfaces 5, 6 between the inner and outer rings 2, 3 on the anti-bias side, The bearing space on the end side of the bearing seal 9 is a sensor arrangement space S in which the components of the sensor device 11 can be incorporated. The sensor device 11 is built in the sensor arrangement space S. A contact-type external seal 10 that seals the sensor arrangement space S is provided outside the sensor arrangement space S with respect to the sensor device 11.

  The bearing seals 8 and 9 are attached to the outer ring 3, and the outer seal 10 is attached to the inner ring 2. Specifically, one bearing seal 8 includes a ring-shaped cored bar 14 and an elastic member 15 fixed to the cored bar 14, and an outer diameter side end thereof is formed on the inner diameter surface of the outer ring 3. By fitting into the seal mounting groove 16, it is attached to the outer ring 3. The other bearing seal 9 is also composed of a ring-shaped cored bar 17 and an elastic member 18 fixed to the cored bar 17, and an outer diameter side end of the seal mounting groove formed on the inner diameter surface of the outer ring 3. It is attached to the outer ring 3 by being fitted to 19. Lip portions 15 a and 18 a whose tips contact the outer diameter surface of the inner ring 2 are formed at the inner diameter side ends of the elastic members 15 and 18 in the bearing seals 8 and 9.

  The outer seal 10 is composed of a ring-shaped flat cored bar 20 and an elastic member 21 fixed to the cored bar 20, and the inner diameter end of the outer seal 10 is formed on the inner diameter surface of the inner ring 2. By being fitted to 22, the inner ring 2 is attached. Instead of the step portion 22, a groove may be provided and fitted. A lip portion 21 a whose tip is in contact with the inner diameter surface of the outer ring 3 is formed at the outer diameter side end of the elastic member 21 in the outer seal 10.

  The sensor device 11 includes an encoder 12 that rotates integrally with the outer ring 3, and a sensor 13 that is attached to the inner ring 2 that is a fixed side wheel and detects the encoder 12. The encoder 12 is made of a permanent magnet attached to the bearing seal 9.

  The sensor 13 is attached to the inner ring 2 via the outer seal 10. Specifically, the sensor 13 is configured by disposing a magnetic sensor chip 23 made of, for example, a Hall element on a circuit board 24 and is provided on the inner surface of the external seal 10 so as to be integrated with the external seal 10. ing. The signal cord 25 connected to the circuit board 24 of the sensor 13 is drawn out of the bearing from a cord insertion hole 26 formed in the cored bar 20 of the outer seal 10, and then the cord insertion hole 26 is formed of a molding material such as resin. 27 is sealed. Thus, the signal cord 25 is not cut by the rotation of the outer ring 3 by passing the signal cord 25 through the cord insertion hole 26 of the cored bar 20 of the outer seal 10 attached to the inner ring 2 which is a fixed side wheel. The signal cord 25 can be easily pulled out of the bearing. Through this signal code 25, the detection signal of the sensor 13 is output outside the bearing.

In this embodiment, the sensor device 11 outputs an origin signal of one pulse per rotation. The encoder 12 is configured by a magnetic pole portion provided at one place in the circumferential direction of the bearing seal 9. The surface of the encoder 12 facing the sensor 13 is magnetized with one S pole or up to three poles in the order of N, S, N. When the characteristics of the sensor 13 are opposite to each other, the respective polarities need to be reversed. The pulse output from the sensor 13 when the S pole approaches the sensor 13 becomes one pulse origin signal for one rotation on the positive or negative side.
The encoder 12 may be a multipolar magnet that is magnetized in multiple directions in the circumferential direction. In this case, the multipolar magnet may be a sintered magnet obtained by mixing magnetic powder and nonmetallic magnetic powder, or may be a rubber magnet or a plastic magnet.

  FIG. 2 shows a cross-sectional view of one embodiment of a pulley incorporated in an electromagnetic clutch. The pulley 30 is obtained by press-fitting and fixing the above-described bearing 1 with a sensor in an inner diameter hole 32 of a ring-shaped rotating member 31. The pulley 30 is provided with a belt groove 33 on which the driving belt 35 is hung on the outer periphery of the rotating member 31, and the belt groove 33 is toothed. A circumferential groove 34 in which a coil (not shown) of an electromagnetic clutch is loosely fitted is provided on one side surface of the rotating member 31.

  The pulley 30 is an offset type pulley in which the center in the width direction of the sensor-equipped bearing 1 is intentionally biased in the axial direction with respect to the center C1 in the width direction of the belt groove 33. The built-in sensor device 11 is fixed to the rotating member 31 so as to face the bearing bias installation side of the rotating member 31. Specifically, the inner diameter surface of the inner diameter hole 32 in the rotating member 31 is a stepped surface in which the side surface side where the circumferential groove 34 opens is a large diameter surface, and the large diameter surface portion 32 a of the sensor-equipped bearing 1. The outer ring 3 is press fitted. An engagement circumferential groove 32b is provided on the end side of the large-diameter surface portion 32a, and a spacer 36 that engages with the engagement circumferential groove 32b is pressed against the width surface of the inner and outer rings 2 and 3, thereby providing a bearing with sensor. 1 is positioned in the axial direction. The signal cord 25 of the sensor device 11 is drawn to the outside of the rotating member 31 through a hole 36 a penetrating the spacer 36.

  In the press-fitting and fixing of the sensor-equipped bearing 1 to the rotating member 31, the biased side of the center position C between the rolling surfaces 5 and 6 of the two rows in the sensor-equipped bearing 1 is the opposite side of the signal code 25 drawing side. In addition to this, for example, the hue of the bearing seal 8 on the bias side and the bearing seal 9 on the anti-bias side can be changed, or one of the bearing seals or the inner and outer rings 2 and 3 For example, a mark 50 such as a mark as shown in FIG.

  As described above, when the sensor-equipped bearing 1 is incorporated as a bearing of the offset pulley 30, the center position C between the rolling surfaces 5 and 6 of both rows of the sensor-equipped bearing 1 is the center in the width direction of the sensor-equipped bearing 1. Since it is biased to the opposite side to the installation side of the sensor device 11, when a normal double row rolling bearing in which the center position between the rolling surfaces of both rows is made to coincide with the center in the width direction of the bearing is incorporated. In comparison, the offset amount of the center position C between the rolling surfaces 5 and 6 of both rows of the sensor-equipped bearing 1 with respect to the center C1 in the width direction of the belt groove 33 can be reduced or eliminated by cancellation. In this example, it is reduced. As a result, the life extension effect of the sensor-equipped bearing 1 can be obtained.

  Further, since the sensor-equipped bearing 1 has both a rotation speed detection function and a bearing function in a single housing, the vehicle air conditioner equipped with the sensor-equipped bearing 1 and its compressor can be reduced in size and simplified. . That is, unlike the case of providing a sensor device with a dedicated component independent of the bearing, the dedicated installation space, the mounting component, the casing portion, etc. of the sensor device 11 can be omitted, and the sensor mounting process can be omitted.

FIG. 3 shows an example in which the offset pulley 30 of FIG. 2 is used as a pulley of an electromagnetic clutch 43 in a drive system of a compressor 42 in a vehicle air conditioner. A rotating member 31 of the pulley 30 is rotatably supported on the outer periphery of a cylindrical portion 45 a provided in the housing 45 of the compressor 42 via the bearing 1 with sensor.
The electromagnetic clutch 43 includes the pulley 30, a coil 49 that generates an electromagnetic force when energized, and a rotatable driven member 50, and the rotating member 31 and the driven member 50 of the pulley 30 are driven by the electromagnetic force generated by the coil 49. , And the rotation of the rotating member 31 is transmitted to the driven member 50. The coil 49 is fixed to the housing 45 and is loosely fitted in the circumferential groove 34 of the rotating member 31 of the pulley 30. The rotating member 31 is preferably a magnetic material. The driven member 50 is a member in which a ring-shaped clutch plate 52 is attached to a compressor drive shaft 54 by a spring member 53 such as a plate spring, and the clutch plate 52 is made of a magnetic material. The compressor drive shaft 54 is inserted into the cylindrical portion 45a of the housing 45 and is rotatably supported by a bearing (not shown).

  When the coil 49 is excited, the spring member 53 is bent by electromagnetic force, the clutch plate 52 is attracted to the rotating member 31, and the driven member 50 rotates integrally with the rotating member 31. When the excitation is released, the clutch plate 52 is separated by the restoring force of the spring member 53.

  The rotation detection signal of the sensor device 11 in the sensor-equipped bearing 1 is input to the control unit 55 as shown in FIG. For example, the control unit 55 takes a deviation between the reference rotation speed signal a obtained from the rotation speed of the engine and the output of the sensor device 11, and detects the presence or absence of slipping of the belt 35 from the deviation. Further, the control unit 55 performs lock determination of the electromagnetic clutch 43 based on the deviation and performs excitation control of the coil 49.

  According to this electromagnetic clutch 43, every time the sensor-equipped bearing 1 rotates, an origin signal of 1 pulse / 1 rotation is output. By taking this output signal into the control unit 55, the rotational state of the sensor-equipped bearing 1 can be grasped. Further, the presence or absence of slippage of the belt 35 can be detected by reading the deviation between the output signal and the reference rotational speed. Thereby, it can utilize for the control etc. which avoid the serious trouble by belt run out beforehand.

  FIG. 4 shows another embodiment of the present invention. A bearing 1A of this embodiment is a sensor-equipped space bearing in which the sensor device 11 is not built in the sensor-equipped bearing 1 of the embodiment of FIG. Other configurations are the same as the sensor-equipped bearing 1 of the embodiment of FIG.

  The sensor-equipped space-equipped bearing 1A has no rotation detection function, but the center position C between the rolling surfaces 5 and 6 of both rows is biased from the center in the width direction of the bearing 1A to the side opposite to the sensor arrangement space S side. Therefore, when incorporated as a bearing of the offset pulley 30 as shown in FIG. 2, the offset amount of the center position C between the rolling surfaces 5 and 6 of both rows of the bearing 1A with respect to the center C1 in the width direction of the belt groove 33. Can be reduced or offset. As a result, the life extension effect of the sensor-equipped space-equipped bearing 1A is obtained.

  FIG. 5 shows a sensor-equipped bearing 1B according to another embodiment of the present invention. This sensor-equipped bearing 1B is a single-row multipoint contact ball bearing, and is a four-point contact ball bearing. That is, the sensor-equipped bearing 1B has contact angles θ1 and θ2 in both forward and reverse directions, and is a bearing that contacts the inner and outer rings 2 and 3 at four points. Each of the rolling surfaces 5A and 6A of the inner and outer rings 2 and 3 has, for example, a Gothic arch-shaped cross-sectional shape. In this case, the center position C ′ of the rolling element 4 is offset in the axial direction with respect to the center position of the inner and outer rings 2 and 3 in the axial direction. A sensor arrangement space S in which components of the sensor device 11 can be incorporated is formed on the end side of the rolling surfaces 5A and 6A between the inner and outer rings 2 and 3 on the opposite side. A sensor device 11 for detecting relative rotation between the inner and outer rings 2 and 3 is built in the sensor arrangement space S. The configuration of the sensor device 11 and the bearing seals 9 and 10 is the same as that of the sensor-equipped bearing 1 shown in FIG.

  FIG. 6 shows a cross-sectional view of another embodiment of a pulley incorporated in an electromagnetic clutch. The pulley 30 </ b> A is obtained by press-fitting and fixing the sensor-equipped bearing 1 </ b> B of FIG. 5 in the inner diameter hole 32 of the ring-shaped rotating member 31. The configuration of the rotating member 31 is the same as that of the pulley 30 in FIG. 2. In this case, the pulley 30A is in the width direction of the sensor-equipped bearing 1B with respect to the center C1 in the width direction of the belt groove 33 of the rotating member 31. This is an offset type pulley whose center is intentionally biased in the axial direction, and the sensor-equipped bearing 1B is fixed to the rotating member 31 so that the built-in sensor device 11 faces the bearing bias installation side of the rotating member 31. .

  Also in this embodiment, when the sensor-equipped bearing 1B is incorporated as a bearing of the offset pulley 30A, the center position C ′ of the rolling element 4 of the sensor-equipped bearing 1B moves from the center in the width direction of the sensor-equipped bearing 1B. Since it is biased to the side opposite to the installation side, the center C1 in the width direction of the belt groove 33 is compared with the case where a normal single row ball bearing in which the rolling element center position of the bearing is aligned with the center in the width direction is incorporated. The offset amount of the rolling element center position C ′ of the sensor-equipped bearing 1B can be reduced or eliminated. As a result, the life extension effect of the sensor-equipped bearing 1B is obtained. In addition, the occurrence rate of bearing breakage due to the contact ellipse being detached from the rolling surfaces 5A, 6A of the inner and outer rings 2, 3 can be reduced.

  In the sensor-equipped bearing 1B shown in FIG. 5, the rolling element center with respect to the center C1 in the width direction of the belt groove 33 when the sensor device 11 not incorporated is incorporated as a bearing of the offset pulley 30A as shown in FIG. The offset amount at the position C ′ can be reduced or eliminated. As a result, the life extension effect of the sensor-equipped space bearing can be obtained.

  Moreover, although each said embodiment demonstrated about the case where all were used for the offset type pulley, the bearing with a sensor of this invention can generally exhibit the effect, when used in a load-biased state.

It is sectional drawing of the bearing with a sensor concerning 1st Embodiment of this invention. It is sectional drawing of the offset type pulley incorporating the bearing with the sensor. It is sectional drawing of the electromagnetic clutch incorporating the offset type pulley. It is sectional drawing of the bearing with a built-in space concerning other embodiment of this invention. It is sectional drawing of the bearing with a sensor concerning other embodiment of this invention. It is sectional drawing of the offset type pulley incorporating the bearing with the sensor. It is sectional drawing of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,1B ... Bearing with sensor 1A ... Bearing with built-in space 2 ... Inner ring 3 ... Outer ring 4 ... Rolling elements 5, 5A, 6, 6A ... Rolling surface 11 ... Sensor device 30, 30A ... Pulley 31 ... Rotating member 43 ... Electromagnetic clutch 49 ... coil 50 ... driven member S ... sensor arrangement space C ... center position C 'between rolling surfaces C ... rolling element center position

Claims (6)

  Double-row angular contact ball bearings, in which the center position between the rolling surfaces of both rows is axially biased with respect to the center position of the axial width of the inner and outer rings, and the rolling surface between the inner and outer rings on the opposite side A sensor-equipped bearing comprising a sensor arrangement space in which sensor components can be incorporated closer to the end side, and a sensor device for detecting relative rotation between the inner and outer rings in the sensor arrangement space.   A multi-point contact ball bearing, in which the center position of the rolling element is biased in the axial direction with respect to the center position of the axial width of the inner and outer rings, and the end side from the rolling surface between the inner and outer rings on the non-biased side A sensor-equipped bearing having a sensor arrangement space in which a sensor component can be incorporated, and a sensor device for detecting relative rotation between the inner and outer rings in the sensor arrangement space.   3. The sensor-equipped bearing according to claim 1 or 2, wherein a mark for determining which side of the biased side is an axial direction is provided.   The bearing with a sensor built-in space according to any one of claims 1 to 3, wherein the sensor device is not incorporated.   A pulley having the sensor-equipped bearing according to any one of claims 1 to 3, wherein an outer ring of the sensor-equipped bearing is fixed to a rotating member to be belted.   A pulley having a rotating member that is hung on a belt fixed to an outer ring of a rolling bearing, a coil that generates an electromagnetic force when energized, and a rotatable driven member. 6. An electromagnetic clutch for attracting a driven member to transmit the rotation of the rotating member to the driven member, wherein the pulley according to claim 5 is used as the pulley.

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