JP5051879B2 - Bearing seal - Google Patents

Description

  The present invention relates to a pack seal type bearing seal provided with a magnetic encoder for sealing a bearing portion such as a wheel for an automobile and detecting the rotational speed of a rotating side member such as a wheel.

  The wheel for motor vehicles is rotatably supported via the bearing part comprised by the rolling element interposed between an inner ring, an outer ring, and an inner and outer ring. The bearing space in which the rolling elements are interposed is sealed by a bearing seal interposed between the inner and outer rings to prevent leakage of the lubricant loaded in the bearing portion and intrusion of sludge from the outside. ing. As this bearing seal, there are a slinger fitted integrally to the rotating side member (either the inner ring or the outer ring) and a seal lip fitted integrally to the fixed side member (same as above) and elastically contacting the slinger. A so-called pack seal type in combination with a seal lip member provided has come to be frequently used.

  Recently, in order to control an anti-lock brake system (ABS) and a traction control system (TCS) in an automobile wheel, the rotational speed of the wheel has been detected. In the case of an automobile in which a wheel is supported by a bearing portion (bearing unit) using a pack seal type bearing seal as described above, a number of N poles and S poles are alternately arranged in the circumferential direction on the outer surface of the slinger. An annular multipole magnet (magnetic encoder) magnetized at an equal pitch is mounted, and a magnetic sensor is installed on the fixed side (vehicle body side) to face this magnetic encoder. A rotation speed detection device configured to detect the above is employed (see, for example, FIGS. 3 and 4 of Patent Document 1 and Patent Documents 2 to 4).

By the way, when the rotational speed detection device is constituted by the magnetic encoder mounted on the outer surface of the slinger and the magnetic sensor opposed thereto as described above, these are exposed to an environment susceptible to attack such as water and earth and sand. The surface of the magnetic encoder and the detection surface of the magnetic sensor may be damaged or rusted, and the detection accuracy may be reduced. Therefore, in each of the above-mentioned patent documents, a measure is taken such that the surface of the magnetic encoder is covered with a nonmagnetic protective cover, and the rotational speed is detected via this protective cover.
Japanese Patent Laid-Open No. 11-303879 JP 2002-267680 A JP 2002-333033 A JP 2003-240007 A

  However, in the case of the pack seal type bearing seal disclosed in FIG. 3 of Patent Document 1, the magnetic encoder (magnetic ring in Patent Document 1) includes a slinger (reinforcing ring of the same magnetic ring) and a nonmagnetic protective cover (same as above). Most of the magnetic encoder is covered with a slinger, but the peripheral part of the magnetic encoder is exposed, so this part is still exposed to an environment that is susceptible to sludge and other attacks. There has been a concern that abrasion may occur or water may permeate into an adhesive portion with a slinger or a protective cover and peel off. Further, in the case of the bearing seal disclosed in Patent Document 2, the protective cover is attached to the fixed side, and a predetermined air gap is secured with respect to the magnetic encoder on the rotating side. In addition, since the portion where the magnetic encoder and the protective cover face each other is in a mutually rotating relationship, the setting of the air gap requires accuracy.

  In the case of the bearing seal disclosed in FIG. 3 of Patent Document 3, a slinger and a protective cover both have a cylindrical portion that is fitted to the rotation side member, and a flange portion (standing plate portion) that is connected to the cylindrical portion. And covering the magnetic encoder in a state of being sandwiched between both flange portions, and further bending the peripheral edge portion of the flange portion of the protective cover to the slinger side to cover the peripheral edge portion of the magnetic encoder. However, since the peripheral edge of the flange of the protective cover is bent to the slinger side, the radial width of the flange of the slinger is limited, and it is expected that the sliding contact surface of the seal lip will not be sufficiently secured. Is done. Further, in the case of the bearing seal disclosed in Patent Document 4, there is no fitting relationship with the rotating side member of the protective cover, the peripheral portion is bent to the slinger side, and the protective cover is tightened to the peripheral portion of the slinger. Although it is installed, it is inevitable that a gap is generated between the protective cover and the rotating side member, and there is still a concern that sludge and the like may enter from this portion. In addition, the peripheral edge of the protective cover is folded to the slinger side. It also includes the point that the width in the radial direction of the flange portion of the slinger is restricted by bending as in the case of Patent Document 3.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a novel pack seal type bearing bearing with a magnetic encoder that can reliably protect a magnetic encoder and can also accurately exhibit a sealing function. .

A bearing seal according to a first aspect of the present invention is a pack seal that is interposed between a fixed side member and a rotary side member in a bearing unit that rotatably supports the rotary side member via a bearing portion with respect to the fixed side member. A type of bearing seal, a slinger having a cylindrical part fitted and integrated with the rotating side member, and a flange connected to one end of the cylindrical part, and a fitting fitted to the fixed side member A seal lip member having a seal lip that is elastically slidably contacted with the slinger, an annular multi-pole magnet attached to a side surface of the slinging collar opposite to the bearing, a cylindrical portion fitted and integrated with the rotation side member, and It is a cover member made of a non-magnetic material that includes a flange portion that is continuously provided at one end of the cylindrical portion, and the flange portion of the slinger is a bent cylindrical portion that is bent at the peripheral portion of the flange portion on the flange portion side of the cover member. The above slinger In the state in which the cover member is integrally fitted to the rotation side member, the annular multipolar magnet is sandwiched between the flange portion of the cover member and the flange portion of the slinger, and the annular portion is annular by the bent cylindrical portion. The peripheral end surface portion of the multipolar magnet is covered, and the bent cylindrical portion of the slinger is in contact with the side surface of the bearing portion of the collar portion of the cover member, and the anti-circular multiple of the bent cylindrical portion. The polar magnet side peripheral surface is configured to form the same peripheral surface as the peripheral end surface of the collar portion of the cover member.
Also, fitting a bearing seal according to the second invention, bent cylindrical portion of the upper Symbol slinger, further comprising an extension Detsuba portion overhangs radially at its end, slinger and the cover member to the rotating member In the integrated state, the extending flange portion is configured to overlap with the peripheral side portion of the flange portion of the cover member.

  In the present invention, the cylindrical portion of the slinger and the cylindrical portion of the cover member may be fitted and integrated with the rotation side member in a state of being fitted together. As the annular multipolar magnet, a magnet formed by kneading magnetic powder with rubber or resin and annularly molded, or an annular sintered magnet is used, and a number of N poles and S poles are alternately magnetized in the circumferential direction. It is integrated with the anti-bearing portion side surface of the flange portion of the slinger, or is integrated with the bearing side surface of the flange portion of the cover member.

According to the bearing seal according to the first and second inventions, the seal lip member is fitted and integrated with the fixed side member, and the seal lip is in elastic sliding contact with the slinger attached to the rotation side member. The sealing function is maintained by this elastic sliding contact. In the state in which the slinger and the cover member are integrated with the rotation-side member with the respective cylindrical portions, an annular multipolar magnet is sandwiched between the flange portion of the cover member and the flange portion of the slinger. Therefore, both surfaces of the annular multipolar magnet and the peripheral end surface portion on the rotation side member side are completely covered by these. Also, the slinger collar includes a bent cylindrical portion bent at the periphery of the cover member at the periphery of the cover member, and the bent cylindrical portion causes the peripheral end surface of the annular multipolar magnet (on the counter-rotation side member side). ), The substantially entire circumferential surface of the annular multipolar magnet is covered by the slinger and the cover member. Therefore, even if it is exposed to a harsh environment such as a bearing unit for an automobile wheel, the annular multipolar magnet is not subjected to an attack such as sludge, and there is no concern that it will be damaged or peel off from the attached site. Furthermore, since the flange portion of the slinger is bent at the peripheral portion thereof toward the flange portion side of the cover member, that is, the side opposite to the bearing portion, the surface of the flange portion on the bearing portion side (an annular multipolar magnet is attached). There is little restriction on the radial width of the surface opposite to the surface to be secured, and a large sliding contact area of the seal lip can be ensured. Furthermore, since the cover member is made of a non-magnetic material, the detection accuracy is not affected even when the rotation detection device is configured facing the magnetic sensor installed on the fixed side.

  In the present invention, if the cylindrical portion of the slinger and the cylindrical portion of the cover member are fitted and integrated with each other on the rotating side member, the substantially entire circumferential surface of the annular multipolar magnet is slinger and It is covered only by the cover member. Moreover, the fitting allowance of the cover member with respect to the rotation side member can be reduced, and it is not bulky even in a state where it is assembled as a pack seal, and rationalization of packing / conveying to the assembly process of the bearing unit is achieved.

And in 1st invention, the front-end | tip part of the bending cylindrical part of a slinger contacts the bearing part side surface of the collar part of a cover member, and the anti-annular multipolar magnet side peripheral surface of the said bending cylindrical part is a cover member's side surface. Since it is configured to form the same peripheral surface as the peripheral end surface of the flange portion, the effect of avoiding the influence of sludge and the like can be enhanced as described above, and a large sliding contact area of the seal lip can be ensured. In addition, it becomes easy to design a labyrinth between the same peripheral surface and the seal lip member. In the second invention, the folded cylindrical portion of the slinger, and that further comprising an extended Detsuba portion overhangs radially at its end, the extension Detsuba portion of the flange portion of the cover member Since it is configured to overlap with the peripheral side portion, the presence of the overlapping width by the extended flange portion makes it more effective to avoid the influence of sludge and the like on the peripheral end surface portion on the counter-rotating side member side of the annular multipolar magnet. Made.

  The best mode for carrying out the present invention will be described below with reference to the drawings. 1 is a longitudinal sectional view showing an example of a bearing unit assembled using the bearing seal of the present invention, FIG. 2 is an enlarged view of a portion X in FIG. 1, and FIGS. 3 to 5 are other embodiments of the bearing seal. FIG.

  FIG. 1 shows an example of a structure in which a wheel of an automobile is supported by a rolling bearing unit 1. A tire wheel (not shown) is connected to a hub flange 2a of a hub 2A constituting an inner ring (rotation side member) 2 by bolts 2b. Fixed. A drive shaft (not shown) is spline-fitted into the spline shaft hole 2c formed in the hub 2A, and the rotational driving force of the drive shaft is transmitted to the tire wheel. The hub 2A constitutes the inner ring 2 together with the inner ring member 2B. The outer ring (fixed side member) 3 is attached and fixed to a suspension device (not shown) of the vehicle body. Two rows of rolling elements (balls) 4... Are interposed between the outer ring 3 and the inner ring 2 while being held by a retainer 4a. A bearing portion 1A is constituted by the raceway surfaces formed on the rolling elements 4 and the inner and outer rings 2 and 3, and the inner ring 2 is supported on the outer ring 3 so as to be axially rotatable via the bearing portion 1A. Lubricants loaded in the rolling portions (bearing spaces) of the rolling elements 4 on the outer side in the axial direction of the raceway surfaces of the two rows of rolling elements (balls) 4, that is, on both sides in the axial direction of the bearing portion 1A. Seal rings (bearing seals) 5 and 6 are press fitted between the outer ring 3 and the inner ring 2 to prevent leakage of grease or intrusion of sludge from the outside. A magnetic sensor 11 is installed on the outer ring 3 or the vehicle body (fixed side member) so as to face the vehicle body side seal ring 6, and the tire wheel is formed by the magnetic sensor 11 and an annular multipolar magnet (magnetic encoder) 10 described later. A rotation detection device 12 is configured to detect the rotation speed, rotation angle, and the like.

  FIG. 2 is an enlarged cross-sectional view of the mounting portion of the vehicle body side seal ring 6. The seal ring 6 is fitted to one end of a cylindrical portion 7a and a cylindrical portion 7a (hereinafter referred to as a slinger cylindrical portion) 7a that are fitted and fitted to the outer periphery (outer diameter surface) of the inner ring member (rotary member) 2B. A plurality of sealing lips 8a that are fitted and integrally fitted to the outer ring (fixed side member) 3 and elastically slidably contact with the slinger 7 are provided with a continuously extending outward flange (hereinafter referred to as a slinger flange) 7b. A seal lip member 8 including: a ring-shaped multipolar magnet 10 attached to the anti-bearing portion 1A side (vehicle body side) of the slinger flange portion 7b; and a cylindrical portion 9a fitted integrally to the inner ring member 2B. And a non-magnetic cover member 9 provided with an outward flange (hereinafter referred to as a cover collar) 9b continuously provided at one end of the cylindrical part (hereinafter referred to as a cover cylindrical part) 9a, and a pack seal type Bearing seal with magnetic encoder It is constructed by.

  The slinger cylindrical portion 7a and the cover cylindrical portion 9a are fitted and combined with each other in a state in which the former is externally fitted to the latter, and in this combined state, the slinger cylindrical portion 7a and the cover cylindrical portion 9a are integrally fitted to the outer diameter surface of the inner ring member 2B. The annular multipolar magnet 10 is integrally bonded to the side of the vehicle body of the slinger collar portion 7b, and the annular multipolar magnet 10 is attached in a state where the slinger cylindrical portion 7a and the cover cylindrical portion 9a are integrally fitted to the inner ring member 2B. Is sandwiched between the slinger collar 7b and the cover collar 9b. As the annular multipolar magnet 10, a magnet formed by kneading a magnetic powder with rubber or resin and annularly formed, or a plurality of N poles and S poles magnetized alternately at equal pitches in the circumferential direction of an annular sintered magnet In the example shown in the figure, a rubber magnet is used, and the adhesive integration with the slinger 7 is performed at the time of vulcanization molding.

  The seal lip member 8 is formed by integrating an elastic material 8b made of rubber or the like having a plurality of seal lips 8a... Into the annular cored bar 8c, and is fitted to the inner diameter surface of the outer ring 3 by forming a cylindrical part of the cored bar 8c. It is united. The plurality of seal lips 8a shown in FIG. 2 includes two radial lips that elastically contact the outer peripheral surface of the slinger cylindrical portion 7a, and one piece that elastically contacts the surface opposite to the vehicle body (the bearing portion 1A) of the slinger flange portion 7b. It consists of an axial lip.

  The slinger collar portion 7b includes a bent cylindrical portion 7c bent toward the cover flange portion 9b at the outer peripheral edge portion, and the bent cylindrical portion 7c has a length corresponding to the thickness of the annular multipolar magnet 10. In the state where the extended flange portion 7d extending in the outer diameter direction is provided at the end portion, and the slinger 7 and the cover member 9 are integrally fitted to the inner ring member 2B, the outer peripheral edge surface portion 10a of the annular multipolar magnet 10 is formed. While being covered with the bent cylindrical portion 7c, the extended flange portion 7d is configured to overlap with the outer peripheral edge side portion of the cover flange portion 9b. And the detection surface of the magnetic sensor 11 installed on the fixed side is in close proximity to the side surface of the vehicle body of the cover collar 9b, and a magnetic change accompanying the rotation of the annular multipolar magnet 10 is detected through this cover collar 9b. An obtained rotation detection device 12 is configured.

  In the bearing unit 1 configured as described above, the wheel (not shown) and the inner ring 2 are rotatably supported with respect to the outer ring 3 via the bearing portion 1A. As the wheels and the inner ring 2 rotate, the slinger 7, the cover member 9, and the annular multipolar magnet 10 sandwiched therebetween rotate the shaft. The seal lip 8a is elastically contacted with the surface of the slinger 7 on the bearing part 1A side, and the lubricant filled in the bearing part 1A leaks out and sludge enters the bearing part 1A from the outside by elastic sliding contact with rotation. Etc. are prevented from entering. Further, the magnetic change of the N pole and the S pole accompanying the rotation of the annular multipolar magnet 10 is sequentially detected by the magnetic sensor 11 through the non-magnetic cover collar 9b, and based on this detection information, the rotational speed of the wheel A rotation angle or the like is calculated.

  The annular multipole magnet 10 has an inner peripheral edge face portion 10b covered with a cover cylindrical portion 9a, and both surfaces are sandwiched between a slinger flange portion 7b and a cover flange portion 9b, and the outer peripheral edge surface portion 10a is bent. Since it is covered with the cylindrical portion 7c, there is no portion exposed to the external environment, and there is a concern that it may be damaged due to an attack such as sludge or water may permeate and peel off the adhesive surface with the slinger collar portion 7b. Nor. In particular, in the case of the present embodiment, the bent cylindrical portion 7c is configured such that the extended flange portion 7d provided so as to project in the outer diameter direction overlaps with the outer peripheral edge side portion of the cover flange portion 9b. From this, the overlapping portion more reliably prevents sludge and the like from entering the part where the annular multipolar magnet 10 is attached, improves the durability of the annular multipolar magnet 10, and maintains the function as a magnetic encoder for a long time. The

  The bearing seal 6A shown in FIG. 3 is configured such that the bent cylindrical portion 7c of the slinger 7 also covers the outer peripheral edge surface portion 9c of the cover flange portion 9b. A gap d in consideration of machining tolerances is interposed between the inner diameter surface of the bent cylindrical portion 7c and the outer peripheral edge surface portion 9c. This gap d is a labyrinth between the bent cylindrical portion 7c and the cover flange portion 9b. As a result, the outer peripheral edge surface portion of the annular multipolar magnet 10 is shielded from the external environment, and there is no concern that the annular multipolar magnet 10 may be damaged or peeled off from the attached portion as described above. . In addition, since the slinger flange 7b has few restrictions on its radial width, a large sliding contact area of the seal lip (axial lip) 8a can be secured, and the degree of freedom in design is improved. Since other configurations are the same as described above, common portions are denoted by the same reference numerals, and descriptions thereof are omitted.

  In the bearing seal 6B shown in FIG. 4, the bent cylindrical portion 7c of the slinger 7 has its tip abutting against the bearing side surface 9d of the cover collar portion 9b, and the outer peripheral surface of the bent cylindrical portion 7c. The pole magnet side peripheral surface) is configured to form the same peripheral surface as the outer peripheral edge surface 9c of the cover collar. In the case of this embodiment, the outer peripheral edge surface portion of the annular multipolar magnet 10 is completely covered by the bent cylindrical portion 7c, and therefore, the annular multipolar magnet 10 is damaged and peeled off from the attached portion as described above. There is no concern. In addition, the outer peripheral surface of the bent cylindrical portion 7c forms the same peripheral surface as the outer peripheral end surface 9c of the cover collar portion, so that the labyrinth r with the seal lip member 8 can be easily designed. Furthermore, also in this embodiment, since there are few restrictions on the radial width of the slinger collar 7b, a large sliding contact area of the seal lip (axial lip) 8a can be secured, and the degree of freedom in design is improved. Since other configurations are the same as described above, common portions are denoted by the same reference numerals, and description thereof is omitted here.

  A bearing seal 6C shown in FIG. 5 shows a modification of the bearing seal 6B shown in FIG. That is, the difference is that there are two lip seals 8a that are in elastic contact with the slinger collar 7b. As described above, there are few restrictions on the radial width of the slinger flange portion 7b, and a large sliding contact area of the seal lip (axial lip) 8a can be ensured. Therefore, a plurality of axial lips 8a are provided as shown in the figure. This allows for a higher sealing function. Thus, the provision of a plurality of axial lips 8a can also be applied to the bearing seal 6A shown in FIG. 3, thereby improving the sealing function. Since other configurations are the same as described above, common portions are denoted by the same reference numerals, and description thereof is omitted here.

  In each of the above embodiments, the inner ring 2 is a rotation side member and the outer ring 3 is a fixed side member. However, the present invention can also be applied to the case where the inner ring 2 is a fixed side member and the outer ring 3 is a rotation side member. is there. In this case, the slinger cylindrical portion 7a and the cover cylindrical portion 9a are fitted to the inner diameter surface of the outer ring 3, the slinger flange portion 7b and the cover flange portion 9b are formed inwardly, and the seal lip member 8 is disposed outside the inner ring 2. It is fitted to the radial surface. In addition, the slinger cylindrical portion 7a and the cover cylindrical portion 9a are integrally fitted to the rotation side member in a fitted and integrated state, but they can be separately fitted and integrated to the rotation side member. Furthermore, although the example applied to the bearing unit which supports the wheel of a motor vehicle was described, the bearing seal of this invention is applicable also to the bearing unit for which another rotation detection is calculated | required.

It is a longitudinal cross-sectional view which shows an example of the bearing unit assembled using the bearing seal of this invention. It is an enlarged view of the X section in FIG. It is sectional drawing of other embodiment of the same bearing seal. It is sectional drawing of another embodiment of the same bearing seal. It is sectional drawing of the modification of the bearing seal shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bearing unit 1A Bearing part 2 Inner ring | wheel (rotation side member)
3 Outer ring (fixed side member)
6, 6A, 6B, 6C Bearing seal 7 Slinger 7a Slinger cylindrical part 7b Slinger collar part 7c Bending cylindrical part 7d Extension collar part 8 Seal lip member 8a Seal lip 9 Cover member 9a Cover cylinder part 9b Cover collar part 9c Cover collar Peripheral end face part 10 Annular multipole magnet (magnetic encoder)
10a Peripheral end face of an annular multipole magnet

Claims (3)

A pack seal type bearing seal interposed between the fixed side member and the rotating side member in the bearing unit that rotatably supports the rotating side member via the bearing portion with respect to the fixed side member,
A slinger having a cylindrical portion fitted integrally to the rotating side member and a flange portion continuously provided at one end of the cylindrical portion, and a seal lip fitted integrally to the fixed side member and elastically slidably contacting the slinger A sealing lip member, an annular multi-pole magnet attached to the side of the non-bearing portion of the flange portion of the slinger, a cylindrical portion fitted integrally to the rotating side member, and connected to one end of the cylindrical portion A cover member made of a non-magnetic material provided with a collar portion made,
The flange portion of the slinger includes a bent cylindrical portion that is bent toward the flange portion side of the cover member at a peripheral portion thereof, and the cover member in a state where the slinger and the cover member are integrally fitted to the rotation side member. The annular multipolar magnet is sandwiched between the flange portion of the slinger and the flange portion of the slinger, and the peripheral end surface portion of the annular multipole magnet is covered by the bent cylindrical portion,
The bent cylindrical portion of the slinger has a tip abutting against a bearing side surface of the flange portion of the cover member, and an anti-annular multipolar magnet side peripheral surface of the bent cylinder portion is a peripheral end surface of the cover member flange portion. A bearing seal characterized by being configured to form the same peripheral surface. A pack seal type bearing seal interposed between the fixed side member and the rotating side member in the bearing unit that rotatably supports the rotating side member via the bearing portion with respect to the fixed side member,
A slinger having a cylindrical portion fitted integrally to the rotating side member and a flange portion continuously provided at one end of the cylindrical portion, and a seal lip fitted integrally to the fixed side member and elastically slidably contacting the slinger A sealing lip member, an annular multi-pole magnet attached to the side of the non-bearing portion of the flange portion of the slinger, a cylindrical portion fitted integrally to the rotating side member, and connected to one end of the cylindrical portion A cover member made of a non-magnetic material provided with a collar portion made,
The flange portion of the slinger includes a bent cylindrical portion that is bent toward the flange portion side of the cover member at a peripheral portion thereof, and the cover member in a state where the slinger and the cover member are integrally fitted to the rotation side member. The annular multipolar magnet is sandwiched between the flange portion of the slinger and the flange portion of the slinger, and the peripheral end surface portion of the annular multipole magnet is covered by the bent cylindrical portion,
The bent cylindrical portion of the slinger further includes an extending flange portion extending in a radial direction at an end portion thereof, and in a state where the slinger and the cover member are integrally fitted to the rotation side member, the extending flange portion is A bearing seal configured to overlap with a peripheral side portion of a collar portion of a cover member. The bearing seal according to claim 1 or 2,
A bearing seal, wherein the cylindrical portion of the slinger and the cylindrical portion of the cover member are fitted and integrated with the rotating side member in a state of being fitted together.

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