JP2010019423A - Rolling bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stabilize a sealed part for a long period, and to facilitate manufacturing. <P>SOLUTION: A sealing device 8 is constituted by combining the first sealring 81 fixed onto an outer ring member 2, and the second sealring 82 fixed onto an inner ring member 32, a magnetic sensor 15 is fixed onto the first sealring 81, a multipolar magnet rotor 19 opposed thereto is supported by an annular core metal 18 fixed onto the second sealring 82, and the annular core metal 18 and the second sealring 82 are press-in-engaged with the inner ring member 32, under the condition where a cylindrical part of the annular core metal 18 is engaged with a cylindrical part of the second sealring 82. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rolling bearing device that combines two seal rings and incorporates a magnetic sensor as a rotation detector and a pulsar ring.

  In the rolling bearing as described above, a magnetic sensor is attached to a seal ring attached to a fixed-side raceway ring, and a pulsar ring is attached to a seal ring attached to a rotary-side raceway ring. The pulsar ring is made of magnetized with rubber mixed with magnetic powder. A part of the pulsar ring constitutes a part of a sealing part that comes into contact with a rubber seal part provided in the seal ring and seals the inside of the bearing (see Patent Document 1).

French Patent Publication FR2 574 501-A1 (FIG. 6)

  In the above conventional example, a part of the pulsar ring that is in sliding contact with the seal portion is formed of rubber containing magnetic powder. Therefore, the magnetic powder becomes abrasive particles, and the contact partner (the seal portion on the fixed side) is likely to wear. There is a fear.

  Further, in the conventional example, there is a problem that it is difficult to manufacture the seal ring on the side where the pulsar ring is provided.

  The present invention includes an outer ring member, an inner ring member that is concentric with the outer ring member and rotatably provided via a rolling element, a first seal ring that is fixed to the outer ring member, and a second that is fixed to the inner ring member. A rolling device comprising a sealing device combined with a seal ring, a magnetic sensor fixed to the first seal ring, and a multipolar magnet rotor provided on the second seal ring side so as to face the magnetic sensor In the bearing device, the multipolar magnet rotor is supported by an annular core metal fixed to the second seal ring, and the cylindrical portion of the annular core metal and the cylindrical portion of the second seal ring are fitted to each other. In the state, the annular core metal and the second seal ring are press-fitted into the inner ring member.

  The second seal ring is usually provided with a lip, but the multipolar magnet rotor is provided on an annular cored bar. Thus, since the lip of the second seal ring and the multipolar magnet rotor are provided on separate members, the lip of the second seal ring is made of a material such as a multipolar magnet rotor, that is, containing magnetic powder that can become abrasive particles. The rubber or resin can be made of rubber or resin that is not mixed with magnetic powder, and wear of the first seal ring that is a contact partner of the lip is suppressed.

  In addition, since the multipolar magnet rotor is provided on the annular cored bar and separate from the second seal ring, they can be easily manufactured individually.

  In the rolling bearing device having the above-described configuration, a portion extending radially outward of the second seal ring on the outer side in the axial direction than the multipolar magnet rotor is made to face the first seal ring close to the first seal ring. It is desirable to have a configuration in which the outside in the axial direction is sealed.

  According to said structure, since the sealing part formed by the part extended in the radial direction outward of the 2nd seal ring has been arrange | positioned outside a multipolar magnet rotor, a multipolar magnet rotor becomes dirty with dust etc. Can be prevented, and a decrease in detection accuracy can be avoided.

  In the sealing device of the present invention, the wear of the first seal ring can be suppressed, and the multipolar magnet rotor and the second seal ring can be easily and individually manufactured.

Sectional drawing of the rolling bearing apparatus which concerns on one Embodiment of this invention. The figure which expands and shows the principal part of the apparatus of FIG. The front view which shows the rotation detector of FIG. Explanatory drawing when the magnetic sensor is a forward / reverse detection sensor The figure which shows the detection signal output from the forward / reverse detection sensor of FIG. Figure corresponding to Fig. 2 in the reference example Figure corresponding to Figure 2 in another reference example

  1 to 3 show an embodiment of the present invention. In this embodiment, a description will be given in a state in which a seal device is incorporated in the rolling bearing device 1 used on the drive wheel side of an automobile. 1, the left side of the rolling bearing device 1 is the vehicle outer side, and the right side is the vehicle inner side.

  The inner shaft member 3 is pivoted to the outer ring member 2 fixed non-rotatably via two rows of rolling elements (for example, balls) 4 and 5 arranged at equal intervals around the crowns 6a and 6b. It is supported so that it can rotate around its center.

  A flange portion 21 that extends radially outward is formed on the outer peripheral surface of the outer ring member 2. The outer ring member 2 is fixed in a non-rotating manner by fixing the flange portion 21 to the knuckle 9 which is a part of the vehicle body with the bolt 10.

  The inner shaft member 3 includes an inner shaft 31 and an inner ring 32 used for a single row angular ball bearing. The inner ring 32 is fitted on the inner side of the inner shaft 31 on the vehicle inner side. The inner ring 31 is rolled onto the inner shaft 31 by caulking the inner end of the inner shaft 31 radially outward. 32 is integrated.

  The two rows of rolling elements 4 and 5 are provided on the outer peripheral surface of the inner race 32 and the two race portions provided adjacent to the inner peripheral surface of the outer ring member 2 in the axial direction, the race portion provided on the outer peripheral surface of the inner shaft 31. It is interposed between each track part.

  A flange portion 34 that extends radially outward is integrally formed on the outer peripheral surface of the inner shaft 31 on the vehicle outer side. Although not shown, a brake disc and a wheel are attached to the flange portion 34. In the center hole of the inner shaft 31, a shaft portion 13 formed integrally with the bowl-shaped outer ring 12 of the constant velocity joint (CVJ) is spline-fitted, and a nut is attached to the end portion of the shaft portion 13 on the vehicle outer side. The hook-shaped outer ring 12 is integrated with the inner shaft member 3 by screwing 14.

  First and second sealing devices 7 and 8 are attached to both sides in the axial direction between the outer ring member 2 and the inner shaft member 3. Both the sealing devices 7 and 8 prevent the lubricant in the annular space 11 in which the rolling elements 4 and 5 are disposed from leaking to the outside, and prevent intrusion of external muddy water or the like into the annular space 11. .

  Although not shown in detail, the first sealing device 7 disposed on the vehicle outer side has a configuration in which a rubber lip that is in sliding contact with the inner shaft 31 is bonded to a metal ring fitted in the outer ring member 2.

  As shown in FIG. 2, the second seal device 8 disposed on the vehicle inner side has a configuration in which a first seal ring 81 and a second seal ring 82 are combined, and is a so-called pack seal. The second seal device 8 includes a magnetic sensor 15 and a pulsar ring 16 as a rotation detector that detects the rotation state (rotation phase, rotation speed, rotation speed, rotation direction, etc.) of the inner shaft member 3 (inner shaft 31 and inner ring 32). Will be described in detail below.

  The first seal ring 81 is attached to the outer ring member 2 and has a configuration in which a main lip 84 and an auxiliary lip 85 are attached to a first metal ring 83. The first metal ring 83 has a cylindrical portion 83a and a flange portion 83b extending radially inward from the axial inner end of the cylindrical portion 83a, and the main lip 84 and the auxiliary lip 85 are formed on the inner periphery of the flange portion 83b. It is vulcanized and bonded. A resin outer casing 17 having a predetermined thickness is laminated on the entire outer peripheral surface of the cylindrical portion 83 a in the first metal ring 83, and the magnetic sensor 15 is embedded in the resin outer casing 17. A female connector 20 for connecting the magnetic sensor 15 and a harness (not shown) connected to the electronic circuit of the vehicle body projects radially outward at a predetermined position on the circumference of the resin exterior body 17. It is integrally formed in a state.

  The second seal ring 82 is attached to the inner ring 32, and has a configuration in which a radial lip 87 is attached to the second metal ring 86. The second metal ring 86 has a cylindrical portion 86a and a flange portion 86b integrally formed to extend radially outward at the axially outer end of the cylindrical portion 86a, and a radial lip 87 on the outer periphery of the flange portion 86b. Is vulcanized and bonded. The pulsar ring 16 is attached to the second seal ring 82.

  Each lip 84, 85, 87 is made of rubber such as nitrile butadiene rubber (NBR), but may be made of an appropriate resin.

  The pulsar ring 16 is formed by bonding a multipolar magnet rotor 19 to an annular cored bar 18. The annular cored bar 18 has a configuration in which the axially outer end sides of the inner cylinder part 18a and the outer cylinder part 18b arranged concentrically inside and outside in the radial direction are integrally connected by an annular plate part 18c. The multipolar magnet rotor 19 is formed by alternately adhering rubber or resin such as hydrogenated nitrile butadiene rubber (H-NBR) containing magnetic powder on the outer peripheral surface of the outer cylindrical portion 18b of the annular cored bar 18 in the circumferential direction. It is magnetized from the radial direction so that the N pole and the S pole are arranged. In this multipolar magnet rotor 19, as shown in FIGS. 3 and 5, magnetic lines of force that loop between the magnetic poles adjacent in the circumferential direction are emitted to the outer diameter side. In addition, since the raw material of the multipolar magnet rotor 19 is made to go around so as to cover the outer surface of the annular plate portion 18 c, external moisture permeates from the fitting surface between the annular core 18 and the second metal ring 86. Can be prevented. Such a wraparound portion of the raw material of the multipolar magnet rotor 19 may not be provided.

  The pulsar ring 16 is attached to the second seal ring 82 by fitting the inner cylindrical portion 18 a of the annular metal core 18 to the cylindrical portion 86 a of the second metal ring 86, and the pulsar ring 16 is attached to the magnetic sensor 15. Opposed in the radial direction. As a result, as shown in FIG. 3, in the multipolar magnet rotor 19 of the pulsar ring 16, the magnetic field lines that loop between the magnetic poles adjacent in the circumferential direction are emitted to the outer diameter side and enter the detection surface of the magnetic sensor 15. .

  The first metal ring 83 is formed of a nonmagnetic material such as nonmagnetic stainless steel (JIS standard SUS304), for example, because the magnetic sensor 15 is attached. Further, the annular cored bar 18 is formed of a magnetic material such as magnetic stainless steel (JIS standard SUS430), for example, in order to use a magnetic path for converging the magnetic lines of force emitted from the multipolar magnet rotor 19 toward the inner diameter side. Further, the resin outer package 17 for molding the magnetic sensor 15 is a non-magnetic resin material such as engineering plastics such as polyphenylene sulfide (PPS), polybutylene terephthalate (PBT), polyamide (PA). Although not shown, a lubricant such as grease is enclosed in a space surrounded by the first seal ring 81 and the second seal ring 82.

  In such a second seal device 8, the first seal ring 81 and the second seal ring 82 to which the pulsar ring 16 is integrally attached are temporarily assembled, and the second metal ring 86 is attached to the inner ring. 32 is press-fitted into the shoulder portion 32 a of the outer peripheral surface 32, and the resin-made outer body 17 of the first seal ring 81 is press-fitted into the shoulder portion 2 a of the inner peripheral surface of the outer ring member 2. The first seal ring 81 is positioned by bringing the flange portion 17a into contact with the end surface 2b of the outer ring member 2 on the vehicle inner side. In such a mounted state, the main lip 84 and the auxiliary lip 85 of the first seal ring 81 are brought into contact with the outer peripheral surface of the inner cylindrical portion 18a of the annular metal core 18, and the radial lip 87 of the second seal ring 82 is the first lip 87. The metal ring 83 is in contact with the inner peripheral surface of the cylindrical portion 83a. Since the radial lip 87 is disposed outside the pulsar ring 16, the pulsar ring 16 can be prevented from being contaminated by dust or the like, and a decrease in detection accuracy can be avoided. Further, since the main lip 84 and the auxiliary lip 85 of the first seal ring 81 are separated from the rolling element 5 and the raceway portion, it is possible to prevent metal wear powder and the like generated by the rotation of the rolling element 5 from adhering to the pulsar ring 16. , A decrease in detection accuracy can be avoided.

  As described above, in the second sealing device 8, the multipolar magnet rotor 19 of the pulsar ring 16 is provided separately from the radial lip 87 of the second seal ring 82, and the radial lip 87 can be made of abrasive particles. Since it is formed of rubber that is not mixed, it is possible to eliminate such aggression that the first metal ring 83 that is the contact partner of the radial lip 87 is worn. As a result, stable sealing performance can be exhibited over a long period of time.

  In addition, since the pulsar ring 16 is separated from the second seal ring 82, they can be easily manufactured individually and the manufacturing cost can be reduced. In particular, in the above embodiment, since the inner cylindrical portion 18a and the outer cylindrical portion 18b of the annular cored bar 18 are disposed within the axial width of the first seal ring 81 and the second seal ring 82, the second seal device It is not necessary to increase the axial width of the entire 8 and can contribute to compactness. Further, if the axial width of the pulsar ring 16 is maximized within a range in which the first seal ring 81 and the second seal ring 82 are opposed to each other in the axial direction, the pulsar ring 16 is bonded to the side surface of the annular plate portion 18c of the annular core 18. Compared to such a case, it is possible to ensure a large area facing the magnetic sensor 15 and to increase the detection accuracy of the magnetic sensor 15 as much as possible.

  Hereinafter, other embodiments and application examples of the present invention will be described.

  (1) Although not shown, the second seal device 8 can be used for a rolling bearing device used on the driven wheel side of an automobile, and can be used in various places.

  (2) As the magnetic sensor 15, for example, as shown in FIG. 4, a forward / reverse detection sensor including two sensor elements 22a and 22b such as a Hall element and a magnetoresistive element can be used. The two sensor elements 22a and 22b are arranged apart from each other in the circumferential direction, and the arrangement interval is an interval (λ / 4) at which the mutual output phase is 90 degrees as shown in FIG. λ is the magnetization pitch of the multipolar magnet rotor 19. The magnetization pitch is the total length of the circumferential magnetization length of N poles and the circumferential magnetization length of S poles adjacent thereto. When one sensor element 22a outputs the rectangular wave signal of FIG. 5 (A), the other sensor element 22b is 90 ° out of phase with respect to the rectangular wave signal of FIG. 5 (A). Outputs a square wave signal. That is, when the facing state of the multipolar magnet rotor 19 with respect to the forward / reverse detection sensor changes according to the rotational speed or rotational direction of the multipolar magnet rotor 19, the sensor elements 22a of the forward / reverse detection sensor 15 correspond to the change. Since the phase relationship and the phase period of the rectangular wave signal from 22b change, the rotational phase, rotational speed, rotational speed, rotational direction, etc. of the inner shaft member 3 are obtained by performing signal processing on both rectangular wave signals. Can be requested.

  A reference example is shown in FIG. In this example, the second metal ring 86 has a configuration in which an outer cylindrical portion 86c concentric with the cylindrical portion 86a is integrally connected to the outer periphery of the flange portion 86b. The multipolar magnet rotor 19 is directly vulcanized and bonded to the outer peripheral surface of the outer cylindrical portion 86c, and a radial lip 87 is attached so as to be adjacent to the inner side of the multipolar magnet rotor 19 on the vehicle inner side. ing. Also in this embodiment, the radial lip 87 is formed of rubber or resin not mixed with magnetic powder, as in the embodiment shown in FIG.

  Another reference example is shown in FIG. In this example, with respect to the second metal ring 86, the axial dimension of the cylindrical portion 86a is shortened, and a flange portion 86b extending radially outward from the inside of the cylindrical portion 86a is integrally provided, and an outer periphery of the flange portion 86b is formed. The outer cylindrical portion 86c is formed by bending in a lateral U shape. The axial lip 88 that contacts the flange 83b of the first metal ring 83 is vulcanized and bonded to the inner surface of the flange 86b, and the multipolar magnet rotor 19 is directly vulcanized to the outer peripheral surface of the outer cylinder 86c. Further, the main lip 84 and the auxiliary lip 85 of the first seal ring 81 are brought into direct contact with the outer peripheral surface shoulder of the inner ring 32. Also in this embodiment, the axial lip 87 is formed of rubber or resin not mixed with magnetic powder as in the embodiment shown in FIG.

2 outer ring member 3 inner shaft member 32 inner ring 8 second seal device 81 first seal ring 82 second seal ring 86 second metal ring 87 radial lip 15 magnetic sensor 16 pulsar ring 17 resin outer casing 18 annular core 19 multipolar Magnet rotor

Claims (3)

A combination of an outer ring member, an inner ring member concentrically provided with the outer ring member and rotatably via a rolling element, a first seal ring fixed to the outer ring member and a second seal ring fixed to the inner ring member A rolling bearing device comprising: a sealing device; a magnetic sensor fixed to the first seal ring; and a multipolar magnet rotor provided on the second seal ring side so as to face the magnetic sensor.
The multipolar magnet rotor is supported by an annular cored bar fixed to the second seal ring,
The annular core metal and the second seal ring are press-fitted into the inner ring member in a state where the cylindrical portion of the annular core metal and the cylindrical portion of the second seal ring are fitted. Rolling bearing device.   The rolling bearing device according to claim 1, wherein the annular core bar is fitted to an outer periphery of the second seal ring.   The axially outer side of the multipolar magnet rotor is sealed by making a portion extending radially outward of the second seal ring close to the first seal ring outside the multipolar magnet rotor in the axial direction. The rolling bearing device according to claim 1 or 2.

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