JP2007285499A - Bearing device for wheel - Google Patents

Bearing device for wheel Download PDF

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Publication number
JP2007285499A
JP2007285499A JP2006116647A JP2006116647A JP2007285499A JP 2007285499 A JP2007285499 A JP 2007285499A JP 2006116647 A JP2006116647 A JP 2006116647A JP 2006116647 A JP2006116647 A JP 2006116647A JP 2007285499 A JP2007285499 A JP 2007285499A
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Japan
Prior art keywords
slinger
wheel
tip
muddy water
surface side
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JP2006116647A
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Japanese (ja)
Inventor
Isao Hirai
功 平井
Kohei Yoshino
康平 芳野
Shinji Morita
慎治 森田
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NTN Corp
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NTN Corp
NTN Toyo Bearing Co Ltd
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Priority to JP2006116647A priority Critical patent/JP2007285499A/en
Publication of JP2007285499A publication Critical patent/JP2007285499A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7869—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward
    • F16C33/7879—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a further sealing ring
    • F16C33/7883—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a further sealing ring mounted to the inner race and of generally L-shape, the two sealing rings defining a sealing with box-shaped cross-section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7869—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward
    • F16C33/7879—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a further sealing ring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • F16C19/18—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
    • F16C19/181—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact
    • F16C19/183—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles
    • F16C19/184—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement
    • F16C19/186—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement with three raceways provided integrally on parts other than race rings, e.g. third generation hubs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00—Articles relating to transporting
    • F16C2326/01—Parts of vehicles in general
    • F16C2326/02—Wheel hubs or castors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/80—Labyrinth sealings
    • F16C33/805—Labyrinth sealings in addition to other sealings, e.g. dirt guards to protect sealings with sealing lips

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Of Bearings (AREA)
  • Rolling Contact Bearings (AREA)
  • Sealing With Elastic Sealing Lips (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To prolong bearing service life by effectively preventing the entry of muddy water in a bearing space in a bearing device for a wheel equipped with a rotation sensor. <P>SOLUTION: An magnetic rubber 17 mounted on the outer surface side of an annular part 15b of a slinger 15 is turned around to the inner surface side from the tip of the annular part 15b forming a radial clearance 16. The clearance 16 is formed between the magnetic rubber 17 turned around to the inner surface side from the tip of the annular part 15b and a rubber member 14 of a seal member 12 so as to be radially inclined outward to the outside in an axial direction. By so doing, the device is formed to discharge muddy water entering thereinto through the clearance 16 radially inclined outward by a centrifugal force produced by the rotation of a wheel, besides resisting the entry of muddy water through the clearance 16 by increasing the length of the clearance 16. As a result, the entry of muddy water in the bearing space can be effectively prevented to prolong the bearing service life. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、車輪用軸受装置に関する。   The present invention relates to a wheel bearing device.

自動車の車輪を支持する車輪用軸受装置には、複列の軌道面を内径側に有する外方部材と、この外方部材の各軌道面と対向する複列の軌道面を外径側に有する内方部材と、これらの外方部材と内方部材の間の軸受空間に複列に配列された転動体とからなるものがあり、外方部材と内方部材のうちのいずれか一方が車体側に取り付けられる固定部材、他方が車輪側に取り付けられる回転部材とされている。このような車輪用軸受装置では、外方部材と内方部材の間の軸受空間に泥水等が浸入しないように、軸受空間の一端側または両端側が密封手段で密封される。なお、軸受空間の一端側のみを密封手段で密封したものでは、他端側は軸受部の外方でキャップ等によって密封される。   A wheel bearing device for supporting a wheel of an automobile has an outer member having a double row raceway surface on the inner diameter side, and a double row raceway surface facing each raceway surface on the outer member on the outer diameter side. There is an inner member and rolling elements arranged in a double row in a bearing space between the outer member and the inner member, and one of the outer member and the inner member is a vehicle body. The fixing member attached to the side is the rotating member attached to the wheel side. In such a wheel bearing device, one end side or both end sides of the bearing space are sealed by a sealing means so that muddy water or the like does not enter the bearing space between the outer member and the inner member. In the case where only one end side of the bearing space is sealed by the sealing means, the other end side is sealed by a cap or the like outside the bearing portion.

また近年では、自動車の走行安定性を向上させるために、ＡＢＳ（Antilock Brake System）等が組み込まれることが多く、その制御のための車輪の回転を検出する回転センサが車輪用軸受装置に装着されている。このような回転センサを装着した車輪用軸受装置には、軸受空間の一端側を密封する密封手段を、固定部材側に装着され、複数のシールリップを有するシール部材と、回転部材側に装着され、シール部材との間に半径方向隙間を先端で形成する円環部を有するスリンガとからなり、シールリップの少なくとも１つを、スリンガの円環部の内面側に接触させるものとし、円周方向で複数の磁極に着磁された磁性ゴムをスリンガの円環部の外面側に取り付けて、この円環部の外面側に取り付けた磁性ゴムを回転センサの磁気エンコーダとしたものがある（例えば、特許文献１参照）。   In recent years, ABS (Antilock Brake System) or the like is often incorporated in order to improve the running stability of a car, and a rotation sensor for detecting the rotation of the wheel for the control is mounted on the wheel bearing device. ing. In such a wheel bearing device equipped with a rotation sensor, a sealing means for sealing one end side of the bearing space is mounted on the fixed member side, and a sealing member having a plurality of seal lips and mounted on the rotating member side. , And a slinger having an annular portion that forms a radial clearance between the seal member and the seal member, and at least one of the seal lips is brought into contact with the inner surface side of the annular portion of the slinger, and the circumferential direction The magnetic rubber magnetized on the plurality of magnetic poles is attached to the outer surface side of the annular portion of the slinger, and the magnetic rubber attached to the outer surface side of the annular portion is used as the magnetic encoder of the rotation sensor (for example, Patent Document 1).

特開２００４−６０７５１号公報（第６図）Japanese Patent Laid-Open No. 2004-60751 (FIG. 6)

特許文献１に記載されたような回転センサを装着した車輪用軸受装置では、外部に飛散する泥水等が、スリンガの円環部である程度遮断され、ラビリンス隙間となる間隔を持つ円環部の先端とシール部材との間の半径方向隙間から浸入する泥水等が、円環部の内面側等に接触されるシールリップで遮断される。この泥水等を遮断するためのシールリップの個数や形態は種々工夫されているが、半径方向隙間から浸入する特に泥水は完全な遮断が難しく、一部が軸受空間に浸入する。   In the wheel bearing device equipped with the rotation sensor as described in Patent Document 1, muddy water or the like scattered to the outside is blocked to some extent by the ring portion of the slinger, and the tip of the ring portion having an interval that becomes a labyrinth gap Muddy water or the like entering from a radial gap between the seal member and the seal member is blocked by a seal lip that contacts the inner surface side of the annular portion. The number and form of the seal lips for blocking the muddy water and the like are variously devised. However, it is difficult to completely block muddy water entering from the radial gap, and a part of the seal lip enters the bearing space.

このため、車輪用軸受装置の軸受寿命は、通常の軸受における転動疲労寿命よりも、軸受空間に浸入する泥水に起因する不良現象、すなわち、泥分の噛み込みによる疵の発生や、水分による錆の発生等で尽きることが多い。この傾向は、市場回収品の調査によっても確認されている。   For this reason, the bearing life of the wheel bearing device is not due to the rolling fatigue life of a normal bearing, but due to the defective phenomenon caused by the muddy water entering the bearing space, that is, the occurrence of flaws due to the biting of mud, Often exhausted due to rust. This trend has also been confirmed by a survey of market collections.

そこで、本発明の課題は、回転センサを装着した車輪用軸受装置で、軸受空間への泥水の浸入を効果的に防止して、軸受寿命を延長することである。   Accordingly, an object of the present invention is to effectively prevent muddy water from entering a bearing space and extend the bearing life in a wheel bearing device equipped with a rotation sensor.

上記の課題を解決するために、本発明は、複列の軌道面を内径側に有する外方部材と、この外方部材の各軌道面と対向する複列の軌道面を外径側に有する内方部材と、これらの外方部材と内方部材の間の軸受空間に複列に配列された転動体とからなり、前記外方部材と内方部材のうちのいずれか一方を車体側に取り付けられる固定部材、他方を車輪側に取り付けられる回転部材とし、前記外方部材と内方部材の間の軸受空間の一端側を、前記固定部材側に装着され、複数のシールリップを有するシール部材と、前記回転部材側に装着され、前記シール部材との間に半径方向隙間を先端で形成する円環部を有するスリンガとからなり、前記シールリップの少なくとも１つを、前記スリンガの円環部の内面側に接触させる密封手段で密封し、このスリンガの円環部の外面側に、円周方向で複数の磁極に着磁された磁性ゴムを取り付けた車輪用軸受装置において、前記スリンガの円環部の外面側に取り付けられた磁性ゴムを、前記半径方向隙間を形成する円環部の先端から内面側に回り込ませ、この円環部の先端から内面側に回り込ませた磁性ゴムと前記シール部材との間で、前記半径方向隙間を軸方向外方へ半径方向外向きに傾斜させて形成した構成を採用した。   In order to solve the above problems, the present invention has an outer member having a double row raceway surface on the inner diameter side and a double row raceway surface facing each raceway surface on the outer member on the outer diameter side. An inner member and rolling elements arranged in a double row in a bearing space between the outer member and the inner member, and one of the outer member and the inner member is disposed on the vehicle body side. A fixing member to be attached, the other is a rotating member attached to the wheel side, and one end side of a bearing space between the outer member and the inner member is attached to the fixing member side and has a plurality of seal lips And a slinger that is mounted on the rotating member side and has a ring portion that forms a radial gap between the seal member and the seal member, and at least one of the seal lips is connected to the ring portion of the slinger Seal with sealing means to contact the inner surface of the In a wheel bearing device in which magnetic rubber magnetized by a plurality of magnetic poles in the circumferential direction is attached to the outer surface side of the ringer ring portion, the magnetic rubber attached to the outer surface side of the ringer portion of the slinger, The radial gap is axially formed between the sealing member and the magnetic rubber that wraps around toward the inner surface from the tip of the annular portion that forms the radial gap. A configuration formed by inclining outward in the radial direction is employed.

すなわち、スリンガの円環部の外面側に取り付けられた磁性ゴムを、半径方向隙間を形成する円環部の先端から内面側に回り込ませ、この円環部の先端から内面側に回り込ませた磁性ゴムとシール部材との間で、半径方向隙間を軸方向外方へ半径方向外向きに傾斜させて形成することにより、ラビリンス隙間となる間隔を持つ半径方向隙間の長さを長くして、泥水が隙間から入り難くするとともに、隙間から入った泥水が車輪の回転に伴う遠心力で、半径方向外向きに傾斜させた隙間から排出されるようにし、軸受空間への泥水の浸入を効果的に防止して、軸受寿命を延長できるようにした。   That is, the magnetic rubber attached to the outer surface side of the ring portion of the slinger is made to wrap around from the tip of the ring portion forming the radial gap to the inner surface side, and the magnetic rubber wraps from the tip of the ring portion to the inner surface side. By forming the radial gap between the rubber and the seal member so as to be inclined outward in the radial direction in the axial direction, the length of the radial gap having an interval that becomes the labyrinth gap is increased, and the muddy water Makes it difficult to enter through the gap, and the muddy water entering through the gap is discharged from the gap inclined radially outward by the centrifugal force accompanying the rotation of the wheel, effectively injecting muddy water into the bearing space. To prevent this and extend the life of the bearing.

前記半径方向隙間を半径方向外向きに傾斜させた傾斜角は、２５〜４５°とするのが好ましい。傾斜角が２５°未満では、半径方向隙間の長さをあまり延長できず、傾斜角が４５°を越えると、半径方向寸法が大きくなって、密封手段のコンパクトな設計が阻害されるからである。   The inclination angle obtained by inclining the radial gap outward in the radial direction is preferably 25 to 45 °. This is because when the inclination angle is less than 25 °, the length of the radial gap cannot be extended so much, and when the inclination angle exceeds 45 °, the radial dimension becomes large and the compact design of the sealing means is hindered. .

本発明の車輪用軸受装置は、スリンガの円環部の外面側に取り付けられた磁性ゴムを、半径方向隙間を形成する円環部の先端から内面側に回り込ませ、この円環部の先端から内面側に回り込ませた磁性ゴムとシール部材との間で、半径方向隙間を軸方向外方へ半径方向外向きに傾斜させて形成することにより、ラビリンス隙間となる間隔を持つ半径方向隙間の長さを長くして、泥水が隙間から入り難くするとともに、隙間から入った泥水が車輪の回転に伴う遠心力で、半径方向外向きに傾斜させた隙間から排出されるようにしたので、軸受空間への泥水の浸入を効果的に防止して、軸受寿命を延長することができる。   In the wheel bearing device of the present invention, the magnetic rubber attached to the outer surface side of the annular portion of the slinger is caused to wrap around from the tip of the annular portion forming the radial clearance to the inner surface side, and from the tip of the annular portion. The length of the radial gap having a gap that becomes a labyrinth gap by forming a radial gap inclined radially outward in the axial direction between the magnetic rubber and the seal member that wraps around the inner surface. The length of the muddy water makes it difficult for muddy water to enter from the gap, and the muddy water that has entered from the gap is discharged from the gap that is inclined outward in the radial direction by the centrifugal force associated with the rotation of the wheel. It is possible to effectively prevent the muddy water from entering and extend the life of the bearing.

以下、図面に基づき、本発明の実施形態を説明する。図１および図２は、第１の実施形態を示す。この車輪用軸受装置は、図１に示すように、複列の軌道面２ａ、２ｂを内径側に有する外方部材１と、外方部材１の各軌道面２ａ、２ｂと対向する複列の軌道面４ａ、４ｂを外径側に有する内方部材３と、これらの外方部材１と内方部材３の間の軸受空間に複列に配列され、保持器５で保持された転動体としてのボール６とからなり、外方部材１がフランジ７で車体側に取り付けられる固定部材とされ、内方部材３が内径面の車軸孔８で等速ジョイントまたは車軸に取り付けられる回転部材とされて、内方部材３に設けられたフランジ９に車輪がハブボルト１０で取り付けられるようになっている。なお、内方部材３のインボード側の軌道面４ｂは、内方部材３に外嵌固定された別体の内輪３ａの外径面に設けられている。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 show a first embodiment. As shown in FIG. 1, the wheel bearing device includes an outer member 1 having double-row raceway surfaces 2 a and 2 b on the inner diameter side, and double-row facing each raceway surface 2 a and 2 b of the outer member 1. As an inner member 3 having raceway surfaces 4a and 4b on the outer diameter side, and rolling elements arranged in a double row in a bearing space between the outer member 1 and the inner member 3 and held by the cage 5 The outer member 1 is a fixed member attached to the vehicle body side by a flange 7, and the inner member 3 is a constant velocity joint or a rotating member attached to the axle by an axle hole 8 on the inner diameter surface. A wheel is attached to a flange 9 provided on the inner member 3 with a hub bolt 10. The track surface 4 b on the inboard side of the inner member 3 is provided on the outer diameter surface of a separate inner ring 3 a that is externally fitted and fixed to the inner member 3.

また、前記外方部材１と内方部材３の間の軸受空間のアウトボード側は、外方部材１側に装着されたシール部材１１で密封され、軸受空間のインボード側は、外方部材１側に装着されたシール部材１２と内方部材３側の内輪３ａに装着されたスリンガ１５とからなる密封手段によって密封されている。   Further, the outboard side of the bearing space between the outer member 1 and the inner member 3 is sealed with a seal member 11 mounted on the outer member 1 side, and the inboard side of the bearing space is the outer member. It is sealed by a sealing means comprising a seal member 12 mounted on one side and a slinger 15 mounted on an inner ring 3a on the inner member 3 side.

図２に示すように、前記密封手段のシール部材１２は、外方部材１の内径面端部に内嵌される円筒部１３ａと、円筒部１３ａの軸方向内端から直角に立ち上がる円環部１３ｂとからなる芯金１３と、芯金１３に加硫接着されたゴム部材１４とからなり、このゴム部材１４に、後述するスリンガ１５の円環部１５ｂの内側面に接触する２つのシールリップ１４ａと、スリンガ１５の円筒部１５ａの外径面に接触する１つのシールリップ１４ｂとが形成されている。また、スリンガ１５は、内輪３ａの外径面端部に外嵌される円筒部１５ａと、円筒部１５ａの軸方向外端から立ち上がり、先端がシール部材１２のゴム部材１４との間に半径方向隙間１６を形成する円環部１５ｂとからなり、円環部１５ｂの外側面に、回転センサの磁気エンコーダとなり、円周方向で複数の磁極に着磁された磁性ゴム１７が、加硫接着で取り付けられている。   As shown in FIG. 2, the sealing member 12 of the sealing means includes a cylindrical portion 13 a that is fitted into the end portion of the inner surface of the outer member 1, and an annular portion that rises at a right angle from the axial inner end of the cylindrical portion 13 a. The seal member 13 includes a metal core 13 made of 13b and a rubber member 14 that is vulcanized and bonded to the metal core 13. The rubber member 14 has two seal lips that come into contact with an inner surface of an annular portion 15b of a slinger 15 described later. 14a and one seal lip 14b that contacts the outer diameter surface of the cylindrical portion 15a of the slinger 15 are formed. The slinger 15 rises from a cylindrical portion 15a fitted on the outer diameter end portion of the inner ring 3a and an axially outer end of the cylindrical portion 15a, and has a distal end in a radial direction between the rubber member 14 of the seal member 12. A magnetic rubber 17 magnetized by a plurality of magnetic poles in the circumferential direction is formed by vulcanization adhesion on the outer surface of the annular portion 15b. It is attached.

前記スリンガ１５の円環部１５ｂの外側面に加硫接着された磁性ゴム１７は、円環部１５ｂの先端から内面側に回り込むように形成され、この円環部１５ｂの先端から内面側に回り込んだ磁性ゴム１７と、シール部材１２のゴム部材１４との間で、半径方向隙間１６が軸方向外方へ半径方向外向きに傾斜するように形成されており、この傾斜角θは２５〜４５°とされている。したがって、ラビリンス隙間となる間隔を持つ半径方向隙間１６の長さが、従来のθ＝０°である場合に較べて長くなり、泥水が隙間１６から入り難くなるとともに、隙間１６から入った泥水が車輪の回転に伴う遠心力で、半径方向外向きに傾斜した隙間１６から排出され、軸受空間への泥水の浸入が効果的に防止される。   The magnetic rubber 17 vulcanized and bonded to the outer surface of the annular portion 15b of the slinger 15 is formed so as to wrap around from the tip of the annular portion 15b to the inner surface, and rotates from the tip of the annular portion 15b to the inner surface. A radial gap 16 is formed between the magnetic rubber 17 and the rubber member 14 of the seal member 12 so as to incline radially outward in the axial direction, and the inclination angle θ is 25 to 25. The angle is 45 °. Therefore, the length of the radial gap 16 having a gap serving as a labyrinth gap is longer than that in the conventional case where θ = 0 °, and mud becomes difficult to enter from the gap 16 and mud entering the gap 16 The centrifugal force accompanying the rotation of the wheel is discharged from the gap 16 that is inclined outward in the radial direction, and the intrusion of muddy water into the bearing space is effectively prevented.

図３（ａ）、（ｂ）は、それぞれ前記シール部材１２の変形例を示す。図３（ａ）の変形例は、シール部材１２のゴム部材１４に、スリンガ１５の円環部１５ｂの内側面に接触する１つのシールリップ１４ａと、スリンガ１５の円筒部１５ａの外径面に接触する２つのシールリップ１４ｂとが形成されている。また、図３（ｂ）の変形例は、図３（ａ）の変形例における円筒部１５ａの外径面に接触する２つのシールリップ１４ｂのうちの内側のシールリップ１４ｃが、円筒部１５ａの外径面との間にわずかな隙間を開けた非接触のものとされ、軸受空間に封入された粘度の高いグリースの漏れは防止しつつ、回転トルクを低減させることができる。また、気体の漏れは許容するようになっているため、軸受空間の空気が温度上昇で膨張しても、この膨張した空気の圧力で、シールリップ１４ｃがスリンガ１５の円筒部１５ａの外径面に押圧されることはない。   3A and 3B show modifications of the seal member 12, respectively. 3A, the rubber member 14 of the seal member 12 has a seal lip 14a that contacts the inner surface of the annular portion 15b of the slinger 15, and an outer diameter surface of the cylindrical portion 15a of the slinger 15. Two seal lips 14b that come into contact with each other are formed. Further, in the modified example of FIG. 3B, the inner seal lip 14c of the two seal lips 14b contacting the outer diameter surface of the cylindrical portion 15a in the modified example of FIG. It is a non-contact type with a slight gap between the outer diameter surface and the rotational torque can be reduced while preventing leakage of high-viscosity grease sealed in the bearing space. Further, since gas leakage is allowed, even if the air in the bearing space expands due to a temperature rise, the outer diameter surface of the cylindrical portion 15a of the slinger 15 is caused by the pressure of the expanded air. It is not pressed by.

図４は、第２の実施形態の車輪用軸受装置における前記軸受空間のインボード側の密封手段を示す。この密封手段は、基本的な構成は第１の実施形態のものと同じであり、前記シール部材１２の芯金１３が、外方部材１の内径面端部に内嵌される円筒部１３ａと、円筒部１３ａの軸方向外端から軸方向内方へ斜めに立ち上がる円錐筒部１３ｃと、円錐筒部１３ｃの先端に連なる円環部１３ｂとからなり、円錐筒部１３ｃに加硫接着されたゴム部材１４と、スリンガ１５の円環部１５ｂの先端から内面側に回り込んだ磁性ゴム１７との間で、ラビリンス隙間となる間隔を持つ半径方向隙間１６が軸方向外方へ半径方向外向きに傾斜するように形成されている点が異なる。   FIG. 4 shows a sealing means on the inboard side of the bearing space in the wheel bearing device of the second embodiment. This sealing means has the same basic configuration as that of the first embodiment, and the core 13 of the seal member 12 is a cylindrical portion 13a fitted into the inner surface end of the outer member 1. The cylindrical portion 13a is composed of a conical cylindrical portion 13c that rises obliquely inward in the axial direction from the axially outer end, and an annular portion 13b that continues to the tip of the conical cylindrical portion 13c, and is vulcanized and bonded to the conical cylindrical portion 13c. A radial gap 16 having a gap serving as a labyrinth gap between the rubber member 14 and the magnetic rubber 17 that wraps around from the front end of the annular portion 15b of the slinger 15 toward the outside in the radial direction. It is different in that it is formed so as to be inclined.

上述した実施形態では、外方部材を車体側に取り付けられる固定部材とし、内方部材を車輪側に取り付けられる回転部材として、インボード側の軌道面を別体の内輪に設けたが、本発明に係る車輪用軸受装置は、外方部材を回転部材、内方部材を固定部材としたものにも適用でき、これらの形態も実施形態のものに限定されることはない。また、軸受空間密封手段におけるシール部材のシールリップの個数、形態やスリンガの形態も、実施形態のものに限定されることはない。   In the embodiment described above, the outer member is a fixed member attached to the vehicle body side, the inner member is a rotating member attached to the wheel side, and the track surface on the inboard side is provided on a separate inner ring. The wheel bearing device according to the present invention can also be applied to an outer member as a rotating member and an inner member as a fixed member, and these modes are not limited to those in the embodiment. Further, the number, form and slinger form of the seal lip of the seal member in the bearing space sealing means are not limited to those of the embodiment.

第１の実施形態の車輪用軸受装置を示す縦断面図The longitudinal cross-sectional view which shows the wheel bearing apparatus of 1st Embodiment 図１の軸受空間のインボード側を密封する密封手段を拡大して示す断面図Sectional drawing which expands and shows the sealing means which seals the inboard side of the bearing space of FIG. ａ、ｂは、それぞれ図２の変形例を示す断面図a and b are sectional views showing modifications of FIG. 第２の実施形態の車輪用軸受装置の軸受空間のインボード側を密封する密封手段を拡大して示す断面図Sectional drawing which expands and shows the sealing means which seals the inboard side of the bearing space of the bearing apparatus for wheels of 2nd Embodiment.

符号の説明Explanation of symbols

１ 外方部材
２ａ、２ｂ 軌道面
３ 内方部材
３ａ 内輪
４ａ、４ｂ 軌道面
５ 保持器
６ ボール
７ フランジ
８ 車軸孔
９ フランジ
１０ ハブボルト
１１、１２ シール部材
１３ 芯金
１３ａ 円筒部
１３ｂ 円環部
１３ｃ 円錐筒部
１４ ゴム部材
１４ａ、１４ｂ、１４ｃ シールリップ
１５ スリンガ
１５ａ 円筒部
１５ｂ 円環部
１６ 隙間
１７ 磁性ゴム DESCRIPTION OF SYMBOLS 1 Outer member 2a, 2b Raceway surface 3 Inner member 3a Inner ring 4a, 4b Raceway surface 5 Cage 6 Ball 7 Flange 8 Axle hole 9 Flange 10 Hub bolt 11, 12 Seal member 13 Core metal 13a Cylindrical part 13b Ring part 13c Conical tube portion 14 Rubber members 14a, 14b, 14c Seal lip 15 Slinger 15a Cylindrical portion 15b Ring portion 16 Clearance 17 Magnetic rubber

Claims (2)

複列の軌道面を内径側に有する外方部材と、この外方部材の各軌道面と対向する複列の軌道面を外径側に有する内方部材と、これらの外方部材と内方部材の間の軸受空間に複列に配列された転動体とからなり、前記外方部材と内方部材のうちのいずれか一方を車体側に取り付けられる固定部材、他方を車輪側に取り付けられる回転部材とし、前記外方部材と内方部材の間の軸受空間の一端側を、前記固定部材側に装着され、複数のシールリップを有するシール部材と、前記回転部材側に装着され、前記シール部材との間に半径方向隙間を先端で形成する円環部を有するスリンガとからなり、前記シールリップの少なくとも１つを、前記スリンガの円環部の内面側に接触させる密封手段で密封し、このスリンガの円環部の外面側に、円周方向で複数の磁極に着磁された磁性ゴムを取り付けた車輪用軸受装置において、前記スリンガの円環部の外面側に取り付けられた磁性ゴムを、前記半径方向隙間を形成する円環部の先端から内面側に回り込ませ、この円環部の先端から内面側に回り込ませた磁性ゴムと前記シール部材との間で、前記半径方向隙間を軸方向外方へ半径方向外向きに傾斜させて形成したことを特徴とする車輪用軸受装置。   An outer member having a double-row raceway surface on the inner diameter side, an inner member having a double-row raceway surface facing the raceway surface of the outer member on the outer diameter side, and the outer member and the inner member Rotating body comprising rolling elements arranged in a double row in a bearing space between the members, one of the outer member and the inner member being fixed to the vehicle body side, and the other being mounted to the wheel side One end side of the bearing space between the outer member and the inner member is mounted on the fixed member side, and a seal member having a plurality of seal lips is mounted on the rotating member side. A slinger having a ring portion that forms a radial gap at the tip thereof, and at least one of the seal lips is sealed by a sealing means that contacts an inner surface side of the ring portion of the slinger, In the circumferential direction on the outer surface side of the ring part of the slinger In the wheel bearing device to which the magnetic rubber magnetized to several magnetic poles is attached, the magnetic rubber attached to the outer surface side of the annular portion of the slinger is connected to the inner surface from the tip of the annular portion forming the radial gap. The radial gap is formed to be inclined outward in the axial direction radially outward between the sealing member and the magnetic rubber that has been wound around to the inner surface side from the tip of the annular portion. A wheel bearing device characterized by the above. 前記半径方向隙間を半径方向外向きに傾斜させた傾斜角を２５〜４５°とした請求項１に記載の車輪用軸受装置。   The wheel bearing device according to claim 1, wherein an inclination angle obtained by inclining the radial gap outward in the radial direction is set to 25 to 45 °.
JP2006116647A 2006-04-20 2006-04-20 Bearing device for wheel Pending JP2007285499A (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009168103A (en) * 2008-01-15 2009-07-30 Nsk Ltd Combination sealing ring with encoder
JP2009180366A (en) * 2008-02-01 2009-08-13 Ntn Corp Wheel bearing device
JP2009197883A (en) * 2008-02-21 2009-09-03 Ntn Corp Wheel bearing device
KR20140137364A (en) * 2012-03-22 2014-12-02 섀플러 테크놀로지스 게엠베하 운트 코. 카게 Cassette seal, particularly for a wheel bearing arrangement of a motor vehicle
JP2015086993A (en) * 2013-11-01 2015-05-07 内山工業株式会社 Bearing sealing device
US10302133B2 (en) 2015-08-07 2019-05-28 Schaeffler Technologies AG & Co. KG Sealing structure for bearing
US10677291B2 (en) 2016-10-07 2020-06-09 Nok Corporation Sealing device
CN111656064A (en) * 2018-03-08 2020-09-11 Nok株式会社 Sealing device and sealing structure
US11585380B2 (en) 2018-07-31 2023-02-21 Ntn Corporation Seal member, and bearing device for wheel with seal member
DE102021133168A1 (en) 2021-12-15 2023-06-15 Schaeffler Technologies AG & Co. KG Seal for wheel bearing

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009168103A (en) * 2008-01-15 2009-07-30 Nsk Ltd Combination sealing ring with encoder
JP2009180366A (en) * 2008-02-01 2009-08-13 Ntn Corp Wheel bearing device
JP2009197883A (en) * 2008-02-21 2009-09-03 Ntn Corp Wheel bearing device
KR20140137364A (en) * 2012-03-22 2014-12-02 섀플러 테크놀로지스 게엠베하 운트 코. 카게 Cassette seal, particularly for a wheel bearing arrangement of a motor vehicle
KR102030209B1 (en) * 2012-03-22 2019-10-08 섀플러 테크놀로지스 아게 운트 코. 카게 Cassette seal, particularly for a wheel bearing arrangement of a motor vehicle
JP2015086993A (en) * 2013-11-01 2015-05-07 内山工業株式会社 Bearing sealing device
WO2015064400A1 (en) * 2013-11-01 2015-05-07 内山工業株式会社 Bearing sealing device
US10302133B2 (en) 2015-08-07 2019-05-28 Schaeffler Technologies AG & Co. KG Sealing structure for bearing
US10677291B2 (en) 2016-10-07 2020-06-09 Nok Corporation Sealing device
CN111656064A (en) * 2018-03-08 2020-09-11 Nok株式会社 Sealing device and sealing structure
US11585380B2 (en) 2018-07-31 2023-02-21 Ntn Corporation Seal member, and bearing device for wheel with seal member
DE102021133168A1 (en) 2021-12-15 2023-06-15 Schaeffler Technologies AG & Co. KG Seal for wheel bearing

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