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JP2008002619A - Seal member and hub unit bearing with seal member - Google Patents

Seal member and hub unit bearing with seal member Download PDF

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Publication number
JP2008002619A
JP2008002619A JP2006174000A JP2006174000A JP2008002619A JP 2008002619 A JP2008002619 A JP 2008002619A JP 2006174000 A JP2006174000 A JP 2006174000A JP 2006174000 A JP2006174000 A JP 2006174000A JP 2008002619 A JP2008002619 A JP 2008002619A
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Japan
Prior art keywords
seal member
seal
lip
hub
wheel
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JP2006174000A
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Japanese (ja)
Inventor
Makoto Maebotoke
誠 前佛
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NSK Ltd
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NSK Ltd
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Priority to JP2006174000A priority Critical patent/JP2008002619A/en
Publication of JP2008002619A publication Critical patent/JP2008002619A/en
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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
    • F16C33/7873—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 single sealing ring of generally L-shaped cross-section
    • F16C33/7876—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 single sealing ring of generally L-shaped cross-section with sealing lips
    • 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
    • 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
    • F16C19/185—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 two raceways provided integrally on a part other than a race ring, e.g. a shaft or housing
    • 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

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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

【課題】軸受の軸方向寸法を増大することなく、シール部材のシールリップの反転を確実に防止することができ、また、シール部材の長寿命化を図ることができるシール部材及びシール部材付きハブユニット軸受を提供する。
【解決手段】シール部材２０の弾性部材２２は、少なくとも１つのシールリップ２３を有し、シールリップ２３にリブ２５を設ける。
【選択図】図２A seal member and a hub with a seal member that can reliably prevent reversal of a seal lip of the seal member and increase the life of the seal member without increasing the axial dimension of the bearing. Provide unit bearings.
An elastic member 22 of a seal member 20 has at least one seal lip 23, and a rib 25 is provided on the seal lip 23.
[Selection] Figure 2

Description

本発明は、シール部材及びシール部材付きハブユニット軸受に関し、特に、自動車等の車輪を支持するのに好適なシール部材及びシール部材付きハブユニット軸受に関する。   The present invention relates to a seal member and a hub unit bearing with a seal member, and more particularly to a seal member suitable for supporting a wheel of an automobile or the like and a hub unit bearing with a seal member.

この種のハブユニット軸受の一例として、静止輪である外輪と、回転輪であるハブ輪と、ハブ輪の外周面に保持される内輪と、外輪とハブ輪及び内輪との間に転動自在に介設される複数の玉と、複数の玉を円周方向に等間隔に保持する一対の保持器と、外輪のアウトボード側端部とハブ輪の外周面との間に配置され、複数のシールリップを有するシール部材と、を備えるハブユニット軸受が知られている。   As an example of this type of hub unit bearing, it is possible to roll between an outer ring that is a stationary ring, a hub ring that is a rotating ring, an inner ring that is held on the outer peripheral surface of the hub ring, and between the outer ring, the hub ring, and the inner ring. A plurality of balls interposed between the pair of cages that hold the plurality of balls at equal intervals in the circumferential direction, and an outer ring-side end portion of the outer ring and the outer peripheral surface of the hub ring. A hub unit bearing including a sealing member having a sealing lip is known.

ここで、従来のハブユニット軸受では、その組立工程において、外輪に複数の玉及び保持器が装着され、外輪のアウトボード側端部にシール部材が内嵌されて、それにハブ輪が組み込まれる工程となるが、この工程の際に、シール部材のラジアル方向、且つアウトボード側に延びるシールリップが、ハブ輪の外周面に引っ張られてインボード側に反転し易かった。そして、このシールリップの反転が発生すると、軸受のシール性能が著しく低下して、各種異物の浸入により軸受寿命が短くなってしまう。   Here, in the conventional hub unit bearing, in the assembly process, a plurality of balls and a cage are mounted on the outer ring, a seal member is fitted inside the outer ring side end portion of the outer ring, and the hub ring is incorporated therein. However, during this process, the seal lip extending in the radial direction of the seal member and extending toward the outboard side was easily pulled to the outer peripheral surface of the hub wheel and reversed to the inboard side. When the seal lip is reversed, the seal performance of the bearing is remarkably deteriorated, and the life of the bearing is shortened due to intrusion of various foreign matters.

そこで、このシールリップの反転の対策として、ハブ輪の溝肩部とフランジとの間の段部にテーパー部を設けたハブユニット軸受が知られている（例えば、特許文献１参照）。このテーパー部の角度は一般的に半角１５度〜２５度が好ましく、また、リップの反転防止を確実にするためには、テーパー部の小径は組み込み前のシールリップの内径より小さい必要がある。   Therefore, as a countermeasure against the reversal of the seal lip, a hub unit bearing is known in which a tapered portion is provided at a step portion between the groove shoulder portion of the hub wheel and the flange (see, for example, Patent Document 1). In general, the angle of the taper portion is preferably 15 to 25 degrees, and the small diameter of the taper portion needs to be smaller than the inner diameter of the seal lip before assembling to ensure prevention of lip reversal.

特許第３６４０７８６号公報Japanese Patent No. 3640786

しかしながら、通常のハブユニット軸受では、外輪のアウトボード側端部に配置されるシール部材には高耐久性が要求されるため、シールリップに半径値で０．５ｍｍ程度のしめしろを設けることが普通である。従って、特許文献１に記載のハブユニット軸受のテーパー部に０．５ｍｍ程度のしめしろを設けようとすると、テーパー部の軸方向寸法は少なくとも０．５ｔａｎ（１５度〜２５度）＝１．１〜１．９ｍｍ必要であり、ハブ輪の段部の軸方向寸法が増大してしまう。このため、ハブ輪の軸方向寸法が増大し、軸受重量が増大したり、アウトボード側の軌道面とフランジとの距離が増大したりしてしまう。また、軸受の軸方向寸法に制限がある場合には、転動体間の距離を縮める必要があるので、軸受の剛性や寿命に悪影響が出てしまっていた。   However, in a normal hub unit bearing, since a high durability is required for the seal member disposed at the end portion on the outboard side of the outer ring, an interference margin of about 0.5 mm in radius is provided on the seal lip. It is normal. Therefore, when an interference of about 0.5 mm is provided on the tapered portion of the hub unit bearing described in Patent Document 1, the axial dimension of the tapered portion is at least 0.5 tan (15 to 25 degrees) = 1.1. ˜1.9 mm is required, and the axial dimension of the stepped portion of the hub wheel increases. For this reason, the axial dimension of the hub wheel increases, the bearing weight increases, and the distance between the track surface on the outboard side and the flange increases. In addition, when the axial dimension of the bearing is limited, it is necessary to reduce the distance between the rolling elements, which has adversely affected the rigidity and life of the bearing.

本発明は、このような不都合を解消するためになされたものであり、その目的は、軸受の軸方向寸法を増大することなく、シール部材のシールリップの反転を確実に防止することができ、また、シール部材の長寿命化を図ることができるシール部材及びシール部材付きハブユニット軸受を提供することにある。   The present invention has been made in order to eliminate such inconveniences, and the object thereof is to reliably prevent the reversal of the seal lip of the seal member without increasing the axial dimension of the bearing, Another object of the present invention is to provide a seal member and a hub unit bearing with a seal member that can extend the life of the seal member.

本発明の上記目的は、下記の構成により達成される。
（１） 芯金と、芯金に設けられる弾性部材と、を備える接触型のシール部材であって、弾性部材は、少なくとも１つのシールリップを有し、シールリップにリブを設けることを特徴とするシール部材。
（２） リブは、シールリップの円周方向の複数箇所に設けられることを特徴とする（１）に記載のシール部材。
（３） 少なくとも一つの軌道面が形成される静止輪と、少なくとも一つの軌道面が形成される回転輪と、静止輪及び回転輪の両軌道面の間に転動自在に配置される複数の転動体と、を備え、静止輪及び回転輪の軸方向端部に（１）又は（２）に記載のシール部材を設けることを特徴とするシール部材付きハブユニット軸受。 The above object of the present invention can be achieved by the following constitution.
(1) A contact-type seal member comprising a cored bar and an elastic member provided on the cored bar, wherein the elastic member has at least one seal lip, and a rib is provided on the seal lip. Seal member to be used.
(2) The seal member according to (1), wherein the rib is provided at a plurality of locations in a circumferential direction of the seal lip.
(3) A stationary wheel on which at least one raceway surface is formed, a rotating wheel on which at least one raceway surface is formed, and a plurality of rolling wheels disposed between both raceway surfaces of the stationary wheel and the rotating wheel. A hub unit bearing with a seal member, wherein the seal member according to (1) or (2) is provided at axial ends of the stationary wheel and the rotating wheel.

本発明のシール部材及びシール部材付きハブユニット軸受によれば、弾性部材は、少なくとも１つのシールリップを有し、シールリップにリブを設けるため、軸受の軸方向寸法を増大することなく、シール部材のシールリップの反転を確実に防止することができる。また、リブを設けることでシール部材の強度を向上することができるため、シール部材の長寿命化を図ることができる。   According to the seal member and the hub unit bearing with a seal member of the present invention, the elastic member has at least one seal lip, and a rib is provided on the seal lip. Therefore, the seal member does not increase the axial dimension of the bearing. Inversion of the seal lip can be reliably prevented. Moreover, since the strength of the seal member can be improved by providing the rib, the life of the seal member can be extended.

以下、本発明に係るシール部材及びシール部材付きハブユニット軸受の各実施形態を説明するために、シール部材付きハブユニット軸受について、図面を参照して詳細に説明する。   Hereinafter, in order to describe each embodiment of a seal member and a hub unit bearing with a seal member according to the present invention, a hub unit bearing with a seal member will be described in detail with reference to the drawings.

（第１実施形態）
まず、図１〜図３を参照して、本発明に係るシール部材付きハブユニット軸受の第１実施形態について説明する。
図１は本発明に係るシール部材付きハブユニット軸受の第１実施形態を説明するための断面図、図２は図１のＡ部拡大図、図３は図２に示すシール部材の変形例を説明するための要部拡大図である。 (First embodiment)
First, with reference to FIGS. 1-3, 1st Embodiment of the hub unit bearing with a sealing member which concerns on this invention is described.
FIG. 1 is a sectional view for explaining a first embodiment of a hub unit bearing with a seal member according to the present invention, FIG. 2 is an enlarged view of a portion A in FIG. 1, and FIG. 3 is a modification of the seal member shown in FIG. It is a principal part enlarged view for demonstrating.

本実施形態のシール部材付きハブユニット軸受１０は、図１に示すように、静止輪である外輪１１と、回転輪であるハブ輪１２及び一対の内輪１３と、外輪１１と一対の内輪１３との間に転動自在に介設される複数の玉１４と、複数の玉１４を円周方向に等間隔に保持する一対の保持器１５，１５と、を備える。なお、図１の符号１６は、外輪１１のインボード側端部に外嵌固定されるハブキャップである。   As shown in FIG. 1, the hub unit bearing 10 with a seal member of the present embodiment includes an outer ring 11 that is a stationary ring, a hub ring 12 that is a rotating ring, a pair of inner rings 13, an outer ring 11, and a pair of inner rings 13. And a pair of retainers 15 and 15 for holding the plurality of balls 14 at equal intervals in the circumferential direction. In addition, the code | symbol 16 of FIG. 1 is a hub cap externally fixed by the inboard side edge part of the outer ring | wheel 11. FIG.

外輪１１は、懸架装置を構成するナックル１７に形成される保持孔１７ａに内嵌され、外輪１１の外周面に設けられる懸架用フランジ１１ｂをナックル１７にボルト締結することによってナックル１７に結合固定される。また、外輪１１の内周面には、２列の外輪軌道面１１ａ，１１ａが形成され、一方、一対の内輪１３の外周面には、外輪１１の外輪軌道面１１ａ，１１ａに対応する１列の内輪軌道面１３ａ，１３ａがそれぞれ形成されており、これら両軌道面１１ａ，１１ａ，１３ａ，１３ａの間に玉１４が転動自在に配置される。   The outer ring 11 is fitted into a holding hole 17 a formed in the knuckle 17 constituting the suspension device, and is coupled and fixed to the knuckle 17 by bolting a suspension flange 11 b provided on the outer peripheral surface of the outer ring 11 to the knuckle 17. The Further, two rows of outer ring raceway surfaces 11 a and 11 a are formed on the inner circumferential surface of the outer ring 11, while one row corresponding to the outer ring raceway surfaces 11 a and 11 a of the outer ring 11 is formed on the outer circumferential surface of the pair of inner rings 13. Inner ring raceway surfaces 13a and 13a are respectively formed, and balls 14 are arranged between these raceway surfaces 11a, 11a, 13a and 13a so as to roll freely.

ハブ輪１２のインボード側端部には、小径段部１２ｂが形成されており、一対の内輪１３は、この小径段部１２ｂに外嵌され、ハブ輪１２のインボード側端部を径方向外方に加締め広げた加締め部１２ｃによってハブ輪１２に結合固定される。また、加締め部１２ｃによって一対の内輪１３を押圧することで、適正な予圧が付与されている。   A small-diameter stepped portion 12b is formed at the inboard side end portion of the hub wheel 12, and the pair of inner rings 13 are externally fitted to the small-diameter stepped portion 12b, and the inboard side end portion of the hub wheel 12 is arranged in the radial direction. It is fixedly coupled to the hub wheel 12 by a caulking portion 12c that is caulked outward. Further, an appropriate preload is applied by pressing the pair of inner rings 13 by the caulking portion 12c.

また、ハブ輪１２は、そのアウトボード側端部の外周面に径方向外方に伸びるフランジ１２ｄを有しており、このフランジ１２ｄには、不図示のホイール及びブレーキロータ等を締結するためのハブボルト１８が周方向に等間隔で複数植設される。   The hub wheel 12 has a flange 12d extending radially outwardly on the outer peripheral surface of the end portion on the outboard side, and a flange, a brake rotor, and the like (not shown) are fastened to the flange 12d. A plurality of hub bolts 18 are implanted at equal intervals in the circumferential direction.

そして、本実施形態では、図１及び図２に示すように、外輪１１のアウトボード側端部と内輪１３との間にシール部材２０が設けられる。これにより、ハブユニット軸受１０の軸受空間の軸方向両端部をハブキャップ１６と共にシールして、封入したグリースが外部に漏洩することを防止すると共に、外部に存在する雨水、泥、塵等の各種異物が軸受空間内に浸入することを防止している。   And in this embodiment, as shown in FIG.1 and FIG.2, the sealing member 20 is provided between the outboard side edge part of the outer ring | wheel 11, and the inner ring | wheel 13. As shown in FIG. Thereby, both axial ends of the bearing space of the hub unit bearing 10 are sealed together with the hub cap 16 to prevent the enclosed grease from leaking to the outside, and various kinds of rainwater, mud, dust, etc. existing outside. Foreign matter is prevented from entering the bearing space.

シール部材２０は、外輪１１のアウトボード側端部の内周面に嵌合される芯金２１と、この芯金２１に接着固定される弾性部材２２と、を備え、弾性部材２２は、内輪１３の外周面と摺接する主リップ（シールリップ）２３、及び副リップ（シールリップ）２４を有する。   The seal member 20 includes a cored bar 21 that is fitted to the inner peripheral surface of the end portion on the outboard side of the outer ring 11, and an elastic member 22 that is bonded and fixed to the cored bar 21. 13 has a main lip (seal lip) 23 and a sub lip (seal lip) 24 which are in sliding contact with the outer peripheral surface.

また、本実施形態では、シール部材２０が外輪１１に内嵌され、内輪１３が組み込まれる際に、シール部材２０の主リップ２３が軸受内方に反転しそうになるのを防止するため、図２に示すように、主リップ２３の軸受外方（主リップ２３の摺動部２３ａの逆側の面と芯金２１との間の凹部分）にリブ２５が形成される。このリブ２５は、弾性部材２２の円周方向の複数箇所に形成される。   Further, in the present embodiment, when the seal member 20 is fitted into the outer ring 11 and the inner ring 13 is assembled, the main lip 23 of the seal member 20 is prevented from being inverted to the inside of the bearing. As shown in FIG. 2, a rib 25 is formed on the outer side of the bearing of the main lip 23 (the concave portion between the opposite surface of the sliding portion 23a of the main lip 23 and the core metal 21). The ribs 25 are formed at a plurality of locations in the circumferential direction of the elastic member 22.

このように構成されたシール部材付きハブユニット軸受１０では、外輪１１に複数の玉１４及び保持器１５，１５が装着され、外輪１１のアウトボード側端部にシール部材２０が内嵌されて、それに一対の内輪１３が組み込まれる組立工程において、シール部材２０の主リップ２３が内輪２３の外周面に引っ張られたとしても、リブ２５が、主リップ２３の摺動部２３ａの軸方向内方への移動を阻止して、主リップ２３の反転を確実に防止する。   In the hub unit bearing 10 with the seal member configured as described above, a plurality of balls 14 and cages 15 and 15 are mounted on the outer ring 11, and the seal member 20 is internally fitted to an end portion on the outboard side of the outer ring 11, Even when the main lip 23 of the seal member 20 is pulled on the outer peripheral surface of the inner ring 23 in the assembly process in which the pair of inner rings 13 are incorporated therein, the rib 25 is inward in the axial direction of the sliding portion 23a of the main lip 23. To prevent the main lip 23 from being reversed.

以上説明したように、本実施形態のシール部材付きハブユニット軸受１０によれば、シール部材２０の弾性部材２２は、シールリップ２３，２４を有し、シールリップ２３にリブ２５を設けるため、軸受１０の軸方向寸法を増大することなく、シール部材２０のシールリップ２３の反転を確実に防止することができる。また、リブ２５を設けることでシール部材２０の強度を向上することができるため、シール部材２０の長寿命化を図ることができる。   As described above, according to the hub unit bearing 10 with the seal member of the present embodiment, the elastic member 22 of the seal member 20 has the seal lips 23 and 24, and the rib 25 is provided on the seal lip 23. The reversal of the seal lip 23 of the seal member 20 can be reliably prevented without increasing the 10 axial dimension. Moreover, since the strength of the seal member 20 can be improved by providing the ribs 25, the life of the seal member 20 can be extended.

なお、本実施形態のシール部材２０の変形例として、シール部材２０が外輪１１と内輪１３との間に組み込まれる際に、シール部材２０の副リップ２４が軸受外方に反転しそうになるのを防止するため、図３に示すように、副リップ２４の軸受内方（副リップ２４の摺動部２４ａの逆側の面と芯金２１との間の凹部分）にリブ２５が形成されていてもよい。   As a modification of the seal member 20 of the present embodiment, when the seal member 20 is assembled between the outer ring 11 and the inner ring 13, the sub lip 24 of the seal member 20 is likely to be reversed outwardly of the bearing. In order to prevent this, as shown in FIG. 3, ribs 25 are formed on the bearing inner side of the secondary lip 24 (the concave portion between the opposite surface of the sliding portion 24 a of the secondary lip 24 and the cored bar 21). May be.

この場合、外輪１１に複数の玉１４及び保持器１５，１５が装着され、それに一対の内輪１３が組み込まれて、外輪１１のアウトボード側端部と内輪１３との間にシール部材２０が押し込まれて装着される組立工程おいて、シール部材２０の副リップ２４が内輪２３の外周面に引っ張られたとしても、リブ２５が、副リップ２４の摺動部２４ａの軸方向外方への移動を阻止して、副リップ２４の反転を確実に防止する。   In this case, a plurality of balls 14 and cages 15, 15 are mounted on the outer ring 11, and a pair of inner rings 13 are incorporated therein, and the seal member 20 is pushed between the outer ring 11 end portion of the outer ring 11 and the inner ring 13. Even when the sub lip 24 of the seal member 20 is pulled on the outer peripheral surface of the inner ring 23 in the assembly process, the rib 25 moves outward in the axial direction of the sliding portion 24a of the sub lip 24. To prevent the sub lip 24 from being reversed.

（第２実施形態）
まず、図４及び図５を参照して、本発明に係るシール部材付きハブユニット軸受の第２実施形態について説明する。なお、第１実施形態と同一又は同等部分については、図面に同一符号を付してその説明を省略或いは簡略化する。
図４は本発明に係るシール部材付きハブユニット軸受の第２実施形態を説明するための断面図、図５は図４のＢ部拡大図である。 (Second Embodiment)
First, with reference to FIG.4 and FIG.5, 2nd Embodiment of the hub unit bearing with a sealing member which concerns on this invention is described. Note that portions that are the same as or equivalent to those of the first embodiment are denoted by the same reference numerals in the drawings, and description thereof is omitted or simplified.
FIG. 4 is a sectional view for explaining a second embodiment of the hub unit bearing with a seal member according to the present invention, and FIG. 5 is an enlarged view of a portion B of FIG.

本実施形態のシール部材付きハブユニット軸受３０は、図４に示すように、静止輪である外輪１１と、回転輪であるハブ輪３２及び内輪３３と、外輪１１とハブ輪３２及び内輪３３との間に転動自在に介設される複数の玉１４と、複数の玉１４を円周方向に等間隔に保持する一対の保持器１５，１５と、を備える。   As shown in FIG. 4, the hub unit bearing 30 with the seal member of the present embodiment includes an outer ring 11 that is a stationary ring, a hub ring 32 and an inner ring 33 that are rotating wheels, an outer ring 11, a hub ring 32, and an inner ring 33. And a pair of retainers 15 and 15 for holding the plurality of balls 14 at equal intervals in the circumferential direction.

また、ハブ輪３２及び内輪３３の外周面には、外輪１１の外輪軌道面１１ａ，１１ａに対応する１列の内輪軌道面３２ａ，３３ａがそれぞれ形成されており、これら両軌道面１１ａ，１１ａ，３２ａ，３３ａの間に玉１４が転動自在に配置される。   Further, on the outer peripheral surfaces of the hub wheel 32 and the inner ring 33, a row of inner ring raceway surfaces 32a and 33a corresponding to the outer ring raceway surfaces 11a and 11a of the outer ring 11 are formed, respectively, and both these raceway surfaces 11a, 11a, Balls 14 are arranged between 32a and 33a so as to be freely rollable.

ハブ輪３２のインボード側端部には、小径段部３２ｂが形成されており、内輪３３は、この小径段部３２ｂに外嵌され、ハブ輪３２のインボード側端部を径方向外方に加締め広げた加締め部３２ｃによってハブ輪３２に結合固定される。また、加締め部３２ｃによって内輪３３を押圧することで、適正な予圧が付与されている。   A small-diameter step 32b is formed at the inboard side end of the hub wheel 32, and the inner ring 33 is externally fitted to the small-diameter step 32b, and the inboard-side end of the hub wheel 32 is radially outward. It is coupled and fixed to the hub wheel 32 by a caulking portion 32c that is caulked and spread. Moreover, the appropriate preload is provided by pressing the inner ring | wheel 33 by the crimping part 32c.

また、ハブ輪３２は、そのアウトボード側端部の外周面に径方向外方に伸びるフランジ３２ｄを有しており、このフランジ３２ｄには、不図示のホイール及びブレーキロータ等を締結するためのハブボルト１８が周方向に等間隔で複数植設される。   The hub wheel 32 has a flange 32d extending radially outwardly on the outer peripheral surface of the end portion on the outboard side, and a wheel, a brake rotor, and the like (not shown) are fastened to the flange 32d. A plurality of hub bolts 18 are implanted at equal intervals in the circumferential direction.

そして、本実施形態では、図４及び図５に示すように、外輪１１のアウトボード側端部とハブ輪３２との間にシール部材４０が設けられる。これにより、ハブユニット軸受１０の軸受空間の軸方向両端部をハブキャップ１６と共にシールして、封入したグリースが外部に漏洩することを防止すると共に、外部に存在する雨水、泥、塵等の各種異物が軸受空間内に浸入することを防止している。   And in this embodiment, as shown in FIG.4 and FIG.5, the sealing member 40 is provided between the outboard side edge part of the outer ring | wheel 11, and the hub ring | wheel 32. As shown in FIG. Thereby, both axial ends of the bearing space of the hub unit bearing 10 are sealed together with the hub cap 16 to prevent the enclosed grease from leaking to the outside, and various kinds of rainwater, mud, dust, etc. existing outside. Foreign matter is prevented from entering the bearing space.

シール部材４０は、外輪１１のアウトボード側端部の内周面に嵌合される芯金４１と、この芯金４１に接着固定される弾性部材４２と、を備え、弾性部材４２は、ハブ輪３２の外周面と摺接する主リップ（シールリップ）４３、副リップ（シールリップ）４４、及びハブ輪３２のフランジ３２ｄの軸方向内側面と接触するアキシアルリップ（シールリップ）４５を有する。   The seal member 40 includes a cored bar 41 fitted to the inner peripheral surface of the end portion on the outboard side of the outer ring 11 and an elastic member 42 bonded and fixed to the cored bar 41. The elastic member 42 is a hub. It has a main lip (seal lip) 43 slidably contacting the outer peripheral surface of the wheel 32, a sub lip (seal lip) 44, and an axial lip (seal lip) 45 contacting the axial inner surface of the flange 32 d of the hub wheel 32.

また、本実施形態では、シール部材４０が外輪１１に内嵌され、内輪１３が組み込まれる際に、シール部材４０の主リップ４３が軸受内方に反転しそうになるのを防止するため、図５に示すように、主リップ４３の軸受外方（主リップ４３の摺動部４３ａの逆側の面と芯金４１との間の凹部分）にリブ４６が形成される。このリブ４６は、弾性部材４２の円周方向の複数箇所に形成される。   Further, in the present embodiment, when the seal member 40 is fitted into the outer ring 11 and the inner ring 13 is assembled, the main lip 43 of the seal member 40 is prevented from being inverted to the inside of the bearing. As shown in FIG. 4, a rib 46 is formed on the outer side of the bearing of the main lip 43 (the concave portion between the opposite surface of the sliding portion 43a of the main lip 43 and the core metal 41). The ribs 46 are formed at a plurality of locations in the circumferential direction of the elastic member 42.

このように構成されたシール部材付きハブユニット軸受３０では、外輪１１に複数の玉１４及び保持器１５，１５が装着され、外輪１１のアウトボード側端部にシール部材４０が内嵌されて、それにハブ輪３２が組み込まれる組立工程において、シール部材４０の主リップ４３がハブ輪３２の外周面に引っ張られたとしても、リブ４６が、主リップ４３の摺動部４３ａの軸方向内方への移動を阻止して、主リップ４３の反転を確実に防止する。   In the hub unit bearing 30 with the seal member configured as described above, a plurality of balls 14 and cages 15 and 15 are mounted on the outer ring 11, and the seal member 40 is fitted inside the outer ring side end of the outer ring 11, Even when the main lip 43 of the seal member 40 is pulled to the outer peripheral surface of the hub wheel 32 in the assembly process in which the hub wheel 32 is incorporated, the rib 46 is inward in the axial direction of the sliding portion 43a of the main lip 43. This prevents the main lip 43 from being reversed.

以上説明したように、本実施形態のシール部材付きハブユニット軸受３０によれば、シール部材４０の弾性部材４２は、シールリップ４３，４４，４５を有し、シールリップ４３にリブ４６を設けるため、軸受３０の軸方向寸法を増大することなく、シール部材４０のシールリップ４３の反転を確実に防止することができる。また、リブ４６を設けることでシール部材４０の強度を向上することができるため、シール部材４０の長寿命化を図ることができる。   As described above, according to the hub unit bearing 30 with the seal member of the present embodiment, the elastic member 42 of the seal member 40 has the seal lips 43, 44, 45 and the ribs 46 are provided on the seal lip 43. The reversal of the seal lip 43 of the seal member 40 can be reliably prevented without increasing the axial dimension of the bearing 30. In addition, since the strength of the seal member 40 can be improved by providing the rib 46, the life of the seal member 40 can be extended.

なお、本発明は、上記した各実施形態に限定されるものでなく、本発明の要旨を逸脱しない範囲において適宜変更可能である。
例えば、本実施形態では、内輪回転の従動輪用のハブユニット軸受に本発明を適用した場合を例示したが、これに代えて、外輪回転の従動輪用のハブユニット軸受や、内輪回転の駆動輪用のハブユニット軸受に本発明を適用してもよい。
また、本実施形態では、シール部材は、外輪のアウトボード側端部とハブ輪又は内輪との間に設けられているが、これに限定されず、外輪のインボード側端部と内輪との間に設けられていてもよい。
また、本実施形態では、転動体として玉を使用しているが、これに限定されず、円筒ころ、円すいころ及び針状ころ等を使用してもよい。
また、本実施形態では、ハブユニット軸受のシール部材に本発明を適用した場合を例示したが、転がり軸受のシール部材に本発明を適用してもよい。
また、リブの幅は、シールリップの反転を防止できる引張強度を有し、シールリップと摺接面が嵌合しシールリップの外径が増大した時に殆んど力を掛けずに座屈するような薄いものとすれば、シール部材の耐久性に影響を与えない。
また、シール部材は、単独の状態において、リブが座屈も引っ張りも発生していない状態とすれば、リブを設けない同一寸法のシール部材と同一の性能を有する。
また、本実施形態では、リブを板状に形成しているが、リブの形状及びリブの固定位置に特に限定はなく、例えば、穴があいていても、リブの弦部分が直線でなくてもよい。
さらに、本実施形態では、リブでシールリップの反転を防止しているが、糸や網等でシールリップを吊るすことによりシールリップの反転を防止してもよい。 The present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the gist of the present invention.
For example, in the present embodiment, the case where the present invention is applied to a hub unit bearing for a driven wheel for inner ring rotation is exemplified, but instead, a hub unit bearing for a driven wheel for outer ring rotation or a drive for inner ring rotation is used. The present invention may be applied to a hub unit bearing for a wheel.
Further, in this embodiment, the seal member is provided between the outboard side end portion of the outer ring and the hub ring or the inner ring, but is not limited to this, and the inboard side end portion of the outer ring and the inner ring It may be provided between them.
In the present embodiment, balls are used as the rolling elements, but the present invention is not limited thereto, and cylindrical rollers, tapered rollers, needle rollers, and the like may be used.
Moreover, although the case where this invention was applied to the seal member of a hub unit bearing was illustrated in this embodiment, you may apply this invention to the seal member of a rolling bearing.
Also, the rib width has a tensile strength that can prevent the seal lip from reversing, so that when the seal lip and the sliding contact surface are fitted and the outer diameter of the seal lip increases, it buckles with little force. If it is thin, it will not affect the durability of the seal member.
Moreover, if the seal member is in a state where the rib is not buckled or pulled in a single state, the seal member has the same performance as a seal member of the same size without the rib.
Further, in the present embodiment, the rib is formed in a plate shape, but the shape of the rib and the fixing position of the rib are not particularly limited, for example, even if there is a hole, the chord portion of the rib is not straight. Also good.
Further, in the present embodiment, the reversal of the seal lip is prevented by the rib, but the reversal of the seal lip may be prevented by suspending the seal lip with a thread or a net.

本発明に係るシール部材付きハブユニット軸受の第１実施形態を説明するための断面図である。It is sectional drawing for demonstrating 1st Embodiment of the hub unit bearing with a sealing member which concerns on this invention. 図１のＡ部拡大図である。It is the A section enlarged view of FIG. 図２に示すシール部材の変形例を説明するための要部拡大図である。It is a principal part enlarged view for demonstrating the modification of the sealing member shown in FIG. 本発明に係るシール部材付きハブユニット軸受の第２実施形態を説明するための断面図である。It is sectional drawing for demonstrating 2nd Embodiment of the hub unit bearing with a sealing member which concerns on this invention. 図４のＢ部拡大図である。It is the B section enlarged view of FIG.

符号の説明Explanation of symbols

１０，３０ シール部材付きハブユニット軸受
１１ 外輪（静止輪）
１１ａ 外輪軌道面
１２，３２ ハブ輪（回転輪）
１３，３３ 内輪（回転輪）
１３ａ，３２ａ，３３ａ 内輪軌道面
１４ 玉（転動体）
１５ 保持器
１６ ハブキャップ
２０，４０ シール部材
２１，４１ 芯金
２２，４２ 弾性部材
２３，４３ 主リップ（シールリップ）
２３ａ，４３ａ 摺動部
２４，４４ 副リップ（シールリップ）
２４ａ 摺動部
２５，４６ リブ
４５ アキシアルリップ（シールリップ） 10, 30 Hub unit bearing with seal member 11 Outer ring (stationary ring)
11a Outer ring raceway surface 12, 32 Hub wheel (rotating wheel)
13, 33 Inner ring (rotating wheel)
13a, 32a, 33a Inner ring raceway surface 14 balls (rolling elements)
15 Cage 16 Hub Cap 20, 40 Seal Member 21, 41 Core Bar 22, 42 Elastic Member 23, 43 Main Lip (Seal Lip)
23a, 43a Sliding part 24, 44 Sub lip (seal lip)
24a Sliding part 25, 46 Rib 45 Axial lip (seal lip)

Claims (3)

芯金と、前記芯金に設けられる弾性部材と、を備える接触型のシール部材であって、
前記弾性部材は、少なくとも１つのシールリップを有し、
前記シールリップにリブを設けることを特徴とするシール部材。 A contact-type sealing member comprising a cored bar and an elastic member provided on the cored bar,
The elastic member has at least one sealing lip;
A seal member, wherein a rib is provided on the seal lip. 前記リブは、前記シールリップの円周方向の複数箇所に設けられることを特徴とする請求項１に記載のシール部材。   The seal member according to claim 1, wherein the rib is provided at a plurality of locations in a circumferential direction of the seal lip. 少なくとも一つの軌道面が形成される静止輪と、少なくとも一つの軌道面が形成される回転輪と、前記静止輪及び前記回転輪の両軌道面の間に転動自在に配置される複数の転動体と、を備え、
前記静止輪及び前記回転輪の軸方向端部に請求項１又は２に記載のシール部材を設けることを特徴とするシール部材付きハブユニット軸受。 A stationary wheel on which at least one raceway surface is formed, a rotating wheel on which at least one raceway surface is formed, and a plurality of rolling wheels that are rotatably arranged between both raceway surfaces of the stationary wheel and the rotating wheel. A moving body,
3. A hub unit bearing with a seal member, wherein the seal member according to claim 1 or 2 is provided at axial ends of the stationary wheel and the rotating wheel.
JP2006174000A 2006-06-23 2006-06-23 Seal member and hub unit bearing with seal member Pending JP2008002619A (en)

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