JP2020106050A

JP2020106050A - Hub unit bearing

Info

Publication number: JP2020106050A
Application number: JP2018242905A
Authority: JP
Inventors: 拓真谷川; Takuma Tanigawa
Original assignee: NSK Ltd
Current assignee: NSK Ltd
Priority date: 2018-12-26
Filing date: 2018-12-26
Publication date: 2020-07-09
Anticipated expiration: 2038-12-26
Also published as: JP7243181B2

Abstract

To provide a hub unit bearing which can prevent water droplets taken by rotational airflow from approaching a slide contact point of a seal lip.SOLUTION: A hub unit bearing 10 includes a seal member 16 which closes the outboard side of a bearing internal space 10a. The seal member 16 has a weir part 35 protruding to the radial outer side farther than an outer diameter surface of an outboard side end part of an outer ring member 11. The weir part 35 is formed with multiple protrusions 40.SELECTED DRAWING: Figure 2

Description

本発明は、ハブユニット軸受に関し、より詳細には、ハブユニット軸受のシール部材に関する。 The present invention relates to a hub unit bearing, and more particularly to a seal member for a hub unit bearing.

ハブユニット軸受の周囲は、回転するハブフランジとブレーキロータに囲まれた空間になっているため、ハブフランジとブレーキロータに巻き上げられた空気が静止したバッキングプレートや外輪に沿って流れる気流となる他に、車両走行時の外輪の周囲にはより強力な回転気流が発生している。 Since the space around the hub unit bearing is surrounded by the rotating hub flange and brake rotor, the air wound around the hub flange and brake rotor becomes an air stream that flows along the stationary backing plate and outer ring. In addition, a stronger rotating airflow is generated around the outer ring when the vehicle is traveling.

そして、ハブユニット軸受の周辺の空間に入り込んだ水滴は、車両走行中は、その回転気流に取り込まれて回転運動（周方向運動）するが、車両の速度が低下したり、停止したりした時は、回転していた水滴が外輪に付着するので、水滴が外輪の外径面を軸方向に勢いよく流れることはほぼなく、ハブユニット軸受のアウトボード側シール部材の耐水性向上のためには、回転気流に取り込まれた水滴を、シールリップの摺接点に接近させないようにすることが重要である。 Then, the water droplets that enter the space around the hub unit bearing are taken in by the rotating air current and make a rotational movement (circumferential movement) while the vehicle is traveling, but when the vehicle speed decreases or stops. Since the rotating water droplets adhere to the outer ring, the water droplets hardly flow vigorously in the axial direction on the outer diameter surface of the outer ring.To improve the water resistance of the outboard side seal member of the hub unit bearing, It is important to prevent water droplets taken into the rotating airflow from coming close to the sliding contact of the seal lip.

アウトボード側シール部材の耐水性向上を図った従来のハブユニット軸受として、外輪とハブ輪との間をシールするアウトボード側シール部材を備え、アウトボード側シール部材が、外輪の外径面よりも径方向外側に突出する円環状の堰部と、堰部から軸方向に突出し、外輪を囲うように形成される円筒状のひさし部と、を有するものが知られている（例えば、特許文献１参照）。 As a conventional hub unit bearing designed to improve the water resistance of the outboard side seal member, an outboard side seal member that seals between the outer ring and the hub ring is provided. Also known is one having an annular weir portion projecting outward in the radial direction, and a cylindrical eave portion projecting axially from the weir portion and surrounding the outer ring (for example, Patent Document 1). 1).

特開２０１８−１６２８３２号公報JP, 2008-162832, A

しかしながら、上記した特許文献１に記載のアウトボード側シール部材では、外輪の外径面を軸方向に流れる水滴を堰き止めることはできるものの、回転気流に取り込まれた水滴をシールリップの摺接点に接近させないようにすることはできなかった。 However, with the outboard-side sealing member described in Patent Document 1 described above, although water droplets that flow axially on the outer diameter surface of the outer ring can be blocked, the water droplets that have been taken into the rotating airflow can be used as sliding contacts for the seal lip. I couldn't keep them away.

本発明は、前述した課題に鑑みてなされたものであり、その目的は、回転気流に取り込まれた水滴がシールリップの摺接点に接近するのを防止することができる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 view of the above-described problems, and an object thereof is to provide a hub unit bearing that can prevent water droplets taken into a rotating airflow from approaching a sliding contact of a seal lip. It is in.

本発明の上記目的は、下記の構成により達成される。
（１）外輪部材と、複数の転動体を介して前記外輪部材に対して回転可能に設けられる内輪部材と、前記複数の転動体を周方向に略等間隔に保持する保持器と、前記外輪部材と前記内輪部材との間の軸受内部空間のアウトボード側を塞ぐシール部材と、を備えるハブユニット軸受であって、前記内輪部材は、その外径面から径方向外方に延出する板状のフランジ部を有し、前記シール部材は、前記外輪部材のアウトボード側端部の内径面に固定される円環状の芯金と、前記芯金に固着される弾性シール部と、を備え、前記弾性シール部は、前記芯金の内径側に形成され、前記内輪部材に摺接する少なくとも１つの接触リップと、前記芯金の外径側に形成され、前記外輪部材のアウトボード側端部の外径面よりも径方向外側に突出する堰部と、を有し、前記堰部に、複数の突起が形成されることを特徴とするハブユニット軸受。
（２）前記弾性シール部は、前記少なくとも１つの接触リップよりも径方向外側に設けられる非接触リップを更に有し、前記非接触リップに、前記複数の突起が形成されることを特徴とする（１）に記載のハブユニット軸受。
（３）外輪部材と、複数の転動体を介して前記外輪部材に対して回転可能に設けられる内輪部材と、前記複数の転動体を周方向に略等間隔に保持する保持器と、前記外輪部材と前記内輪部材との間の軸受内部空間のアウトボード側を塞ぐシール部材と、を備えるハブユニット軸受であって、前記内輪部材は、その外径面から径方向外方に延出する板状のフランジ部を有し、前記シール部材は、前記外輪部材のアウトボード側端部の内径面に固定される円環状の芯金と、前記芯金に固着される弾性シール部と、を備え、前記弾性シール部は、前記芯金の内径側に形成され、前記内輪部材に摺接する少なくとも１つの接触リップと、前記少なくとも１つの接触リップよりも径方向外側に設けられる非接触リップと、を有し、前記非接触リップに、複数の突起が形成されることを特徴とするハブユニット軸受。
（４）前記複数の突起は、前記フランジ部が回転する時に前記外輪部材の周囲に発生する回転気流を乱流化するボルテックスジェネレータであることを特徴とする（１）〜（３）のいずれか１つに記載のハブユニット軸受。 The above object of the present invention is achieved by the following configurations.
(1) An outer ring member, an inner ring member rotatably provided with respect to the outer ring member via a plurality of rolling elements, a retainer that holds the plurality of rolling elements at substantially equal intervals in the circumferential direction, and the outer ring A hub unit bearing, comprising: a seal member for closing an outboard side of a bearing inner space between the inner ring member and the inner ring member, wherein the inner ring member is a plate extending radially outward from an outer diameter surface thereof. And a sealing member having an annular core metal fixed to the inner diameter surface of the outboard side end of the outer ring member, and an elastic seal portion fixed to the core metal. The elastic seal portion is formed on the inner diameter side of the core metal, is formed on the outer diameter side of the core metal, and at least one contact lip that is in sliding contact with the inner ring member, and is the outboard side end portion of the outer ring member. And a weir portion projecting radially outward from the outer diameter surface of the hub unit bearing, wherein a plurality of protrusions are formed on the weir portion.
(2) The elastic seal portion further has a non-contact lip provided radially outside the at least one contact lip, and the plurality of protrusions are formed on the non-contact lip. The hub unit bearing according to (1).
(3) An outer ring member, an inner ring member rotatably provided to the outer ring member via a plurality of rolling elements, a retainer that holds the plurality of rolling elements at substantially equal intervals in the circumferential direction, and the outer ring A hub unit bearing, comprising: a seal member for closing an outboard side of a bearing inner space between the inner ring member and the inner ring member, wherein the inner ring member is a plate extending radially outward from an outer diameter surface thereof. And a sealing member having an annular core metal fixed to the inner diameter surface of the outboard side end of the outer ring member, and an elastic seal portion fixed to the core metal. The elastic seal portion includes at least one contact lip formed on the inner diameter side of the core metal and slidingly contacting the inner ring member, and a non-contact lip provided radially outside the at least one contact lip. A hub unit bearing having a plurality of protrusions formed on the non-contact lip.
(4) The plurality of protrusions are vortex generators that turbulently rotate a rotating airflow generated around the outer ring member when the flange portion rotates, and are any one of (1) to (3). The hub unit bearing according to one.

本発明によれば、シール部材の堰部や非接触リップに形成されるボルテックスジェネレータとなる複数の突起により、フランジ部が回転する時に外輪部材の周囲に発生する回転気流を乱流化することができるため、回転気流に取り込まれた水滴がシールリップの摺接点に接近するのを防止することができる。 According to the present invention, the rotating airflow generated around the outer ring member when the flange portion rotates can be made turbulent by the plurality of protrusions that are vortex generators formed on the dam portion and the non-contact lip of the seal member. Therefore, it is possible to prevent water droplets taken into the rotating airflow from approaching the sliding contact of the seal lip.

本発明に係るハブユニット軸受の第１実施形態を説明する断面図である。It is sectional drawing explaining 1st Embodiment of the hub unit bearing which concerns on this invention. 図１に示すシール部材の周辺の拡大断面図である。It is an expanded sectional view of the periphery of the seal member shown in FIG. 第１実施形態のシール部材の第１変形例を説明する拡大断面図である。It is an expanded sectional view explaining the 1st modification of the seal member of a 1st embodiment. 第１実施形態のシール部材の第２変形例を説明する拡大断面図である。It is an expanded sectional view explaining the 2nd modification of the seal member of a 1st embodiment. 第１実施形態のシール部材の第３変形例を説明する拡大断面図である。It is an expanded sectional view explaining the 3rd modification of the seal member of a 1st embodiment. 第１実施形態のシール部材の第４変形例を説明する拡大断面図である。It is an expanded sectional view explaining the 4th modification of the seal member of a 1st embodiment. 第１実施形態のシール部材の第５変形例を説明する拡大断面図である。It is an expanded sectional view explaining the 5th modification of the seal member of a 1st embodiment. 第１実施形態のシール部材の第６変形例を説明する拡大断面図である。It is an expanded sectional view explaining the 6th modification of the seal member of a 1st embodiment. 第１実施形態のシール部材の第７変形例を説明する拡大断面図である。It is an expanded sectional view explaining the 7th modification of the seal member of a 1st embodiment. 本発明に係るハブユニット軸受の第２実施形態を説明するシール部材の周辺の拡大断面図である。It is an expanded sectional view of the circumference of a seal member explaining a 2nd embodiment of a hub unit bearing concerning the present invention.

以下、本発明に係るハブユニット軸受の各実施形態について、図面に基づいて詳細に説明する。 Hereinafter, embodiments of the hub unit bearing according to the present invention will be described in detail with reference to the drawings.

（第１実施形態）
まず、図１〜図９を参照して、本発明に係るハブユニット軸受の第１実施形態について説明する。 (First embodiment)
First, a first embodiment of a hub unit bearing according to the present invention will be described with reference to FIGS. 1 to 9.

本実施形態のハブユニット軸受１０は、従動輪用のハブユニット軸受であり、図１に示すように、外輪部材１１と、内輪部材であるハブ輪１２と、ハブ輪１２とは別体の内輪部材であり、ハブ輪１２に一体的に固定される内輪１３と、外輪部材１１の内径面とハブ輪１２及び内輪１３の外径面との間に転動可能に２列で配置される複数の玉（転動体）１４と、この２列の複数の玉１４を周方向で等間隔にそれぞれ保持する一対の保持器１５と、外輪部材１１と内輪部材（ハブ輪１２、内輪１３）との間の軸受内部空間１０ａのアウトボード側を塞ぐシール部材１６と、軸受内部空間１０ａのインボード側を塞ぐキャップ１７と、を備える。なお、アウトボード側とは、自動車に組み付けられた状態での幅方向外側となる図１の左側であり、インボード側とは、幅方向中央側となる図１の右側である。 The hub unit bearing 10 of the present embodiment is a hub unit bearing for a driven wheel, and as shown in FIG. 1, an outer ring member 11, a hub ring 12 that is an inner ring member, and an inner ring that is a separate body from the hub ring 12. A plurality of members, which are arranged in two rows so as to be rollable between the inner ring 13 integrally fixed to the hub wheel 12 and the inner diameter surface of the outer ring member 11 and the outer diameter surfaces of the hub wheel 12 and the inner ring 13. No. balls (rolling elements) 14, a pair of cages 15 respectively holding the two rows of balls 14 at equal intervals in the circumferential direction, an outer ring member 11 and an inner ring member (hub ring 12, inner ring 13). A seal member 16 that closes the outboard side of the bearing internal space 10a and a cap 17 that closes the inboard side of the bearing internal space 10a are provided. It should be noted that the outboard side is the left side in FIG. 1 that is the outer side in the width direction when assembled in a vehicle, and the inboard side is the right side in FIG. 1 that is the center side in the width direction.

外輪部材１１の内径面には、互いに平行な２列の外輪軌道面１１ａ，１１ａが離間して形成されている。また、ハブ輪１２及び内輪１３の外径面には、それぞれ内輪軌道面１２ａ，１３ａが外輪部材１１の外輪軌道面１１ａ，１１ａに対応して形成されている。外輪軌道面１１ａ，１１ａ及び内輪軌道面１２ａ，１３ａで構成される２列の軌道には、保持器１５によって転動可能に保持される複数の玉１４が周方向で等間隔にそれぞれ配置されている。 On the inner diameter surface of the outer ring member 11, two rows of outer ring raceway surfaces 11a, 11a parallel to each other are formed separately. Inner ring raceway surfaces 12a and 13a are formed on the outer diameter surfaces of the hub wheel 12 and the inner ring 13 respectively corresponding to the outer ring raceway surfaces 11a and 11a of the outer ring member 11. A plurality of balls 14 rotatably held by a cage 15 are arranged at equal intervals in the circumferential direction on the two rows of raceways composed of the outer ring raceway surfaces 11a, 11a and the inner ring raceway surfaces 12a, 13a. There is.

複数の玉１４は、互いに背面組み合わせ型（ＤＢ）の接触角をなして外輪軌道面１１ａ，１１ａ及び内輪軌道面１２ａ，１３ａに接触して、複列アンギュラ玉軸受が構成される。これにより、ハブ輪１２及び内輪１３は、外輪部材１１に対して回転可能となる。 The plurality of balls 14 contact each other with the outer ring raceway surfaces 11a, 11a and the inner ring raceway surfaces 12a, 13a at a contact angle of a back surface combination type (DB) to form a double-row angular ball bearing. As a result, the hub wheel 12 and the inner wheel 13 can rotate with respect to the outer wheel member 11.

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、この小径段部１２ｂに内輪１３を外嵌した後、小径段部１２ｂの端部を径方向外側にかしめ加工することにより、内輪１３がハブ輪１２に固定される。また、かしめ加工によって内輪１３を押圧することで、適正な予圧が付与される。 A small-diameter step portion 12b is formed at an end portion of the hub wheel 12 on the inboard side. After the inner ring 13 is externally fitted to the small-diameter step portion 12b, the end portion of the small-diameter step portion 12b is caulked outward in the radial direction. By doing so, the inner ring 13 is fixed to the hub ring 12. Further, by pressing the inner ring 13 by caulking, an appropriate preload is applied.

ハブ輪１２は、略円柱形状の部材であり、そのアウトボード側端部には、外径面から径方向外方に延出する板状のフランジ部１２ｃが形成される。フランジ部１２ｃには、不図示のタイヤホイール及びブレーキロータなどを締結するためのハブボルト１２ｄが周方向で等間隔に複数設けられる。 The hub wheel 12 is a substantially columnar member, and a plate-shaped flange portion 12c extending outward in the radial direction from the outer diameter surface is formed at the end portion on the outboard side thereof. The flange portion 12c is provided with a plurality of hub bolts 12d for fastening a tire wheel, a brake rotor, and the like (not shown) at equal intervals in the circumferential direction.

シール部材１６は、図２に示すように、外輪部材１１のアウトボード側端部の内径面に圧入固定される円環状の芯金２０と、芯金２０に固着されるゴムやエラストマーなどからなる弾性シール部３０と、を備える。 As shown in FIG. 2, the seal member 16 is composed of an annular core metal 20 press-fitted and fixed to the inner diameter surface of the outer ring member 11 at the end portion on the outboard side, and rubber or elastomer fixed to the core metal 20. And an elastic seal portion 30.

芯金２０は、鋼板などの金属板に打ち抜き及び曲げなどのプレス加工を施すことにより形成されるものであり、外輪部材１１の内径面に固定される円筒部２１と、円筒部２１のアウトボード側端部から径方向外側に延びる外径鍔部２２と、円筒部２１のインボード側端部からアウトボード側に向けて折り返されると共に径方向内側に延びる内径鍔部２３と、を有する。そして、芯金２０は、その円筒部２１を、外輪部材１１の内周面に圧入固定すると共に、外径鍔部２２のインボード側の側面を、外輪部材１１のアウトボード側端面に、弾性シール部３０の一部を介在させた状態で突き当てている。 The cored bar 20 is formed by subjecting a metal plate such as a steel plate to press working such as punching and bending, and the cylindrical portion 21 fixed to the inner diameter surface of the outer ring member 11 and the outboard of the cylindrical portion 21. It has an outer diameter flange portion 22 that extends radially outward from the side end portion, and an inner diameter flange portion 23 that is folded back from the inboard side end portion of the cylindrical portion 21 toward the outboard side and that extends radially inward. The cored bar 20 has its cylindrical portion 21 press-fitted and fixed to the inner peripheral surface of the outer ring member 11, and the side surface of the outer diameter flange portion 22 on the inboard side is elastically connected to the end surface of the outer ring member 11 on the outboard side. It abuts with a part of the seal portion 30 interposed.

弾性シール部３０は、第１〜第３接触リップ３１〜３３と、１つの非接触リップ３４と、１つの堰部３５と、を有する。 The elastic seal portion 30 has first to third contact lips 31 to 33, one non-contact lip 34, and one dam portion 35.

第１接触リップ３１は、芯金２０の内径鍔部２３の内径側端部からインボード側且つ径方向内側に向けて傾斜して形成されている。第２接触リップ３２は、芯金２０の内径鍔部２３の内径側端部からアウトボード側且つ径方向外側に向けて傾斜して形成されている。第３接触リップ３３は、第２接触リップ３２よりも径方向外側に設けられ、芯金２０の内径鍔部２３の側面からアウトボード側且つ径方向外側に向けて傾斜して形成されている。第１〜第３接触リップ３１〜３３は、シール部材１６の全周に亘って形成されている。そして、第１〜第３接触リップ３１〜３３の先端部は、ハブ輪１２の外径面や軸方向側面に全周に亘ってそれぞれ摺接する。なお、図１〜図１０では、第１〜第３接触リップ３１〜３３の形状は、シール部材１６の自由状態を示している。 The first contact lip 31 is formed so as to be inclined from the inner diameter side end portion of the inner diameter flange portion 23 of the cored bar 20 toward the inboard side and the radially inner side. The second contact lip 32 is formed to be inclined from the inner diameter side end portion of the inner diameter flange portion 23 of the cored bar 20 toward the outboard side and the radially outer side. The third contact lip 33 is provided on the outer side in the radial direction with respect to the second contact lip 32, and is formed to be inclined from the side surface of the inner diameter flange portion 23 of the cored bar 20 toward the outboard side and the outer side in the radial direction. The first to third contact lips 31 to 33 are formed over the entire circumference of the seal member 16. The tip ends of the first to third contact lips 31 to 33 are in sliding contact with the outer diameter surface and the axial side surface of the hub wheel 12 over the entire circumference. 1 to 10, the shapes of the first to third contact lips 31 to 33 show the free state of the seal member 16.

非接触リップ３４は、第３接触リップ３３よりも径方向外側に設けられ、芯金２０の外径鍔部２２の外径側端部からアウトボード側且つ径方向外側に向けて傾斜して形成されている。非接触リップ３４は、シール部材１６の全周に亘って形成されている。そして、非接触リップ３４の先端部は、ハブ輪１２のフランジ部１２ｃのインボード側の側面に近接対向して、フランジ部１２ｃとの間にラビリンスシールを形成している。 The non-contact lip 34 is provided radially outside the third contact lip 33, and is formed to be inclined from the outer diameter side end of the outer diameter flange portion 22 of the cored bar 20 toward the outboard side and the diameter outer side. Has been done. The non-contact lip 34 is formed over the entire circumference of the seal member 16. The tip of the non-contact lip 34 closely opposes the inboard side surface of the flange portion 12c of the hub wheel 12 to form a labyrinth seal with the flange portion 12c.

堰部３５は、芯金２０の外径鍔部２２の外径側端部から径方向外側に向けて形成されている。堰部３５は、外輪部材１１のアウトボード側端部の外径面よりも径方向外側に突出するように形成されている。堰部３５は、シール部材１６の全周に亘って形成されている。なお、外径鍔部２２のインボード側の側面は、この堰部３５の一部を介在させた状態で外輪部材１１のアウトボード側端面に突き当てられている。 The dam portion 35 is formed radially outward from the outer diameter side end portion of the outer diameter flange portion 22 of the cored bar 20. The dam portion 35 is formed so as to project radially outward from the outer diameter surface of the end portion on the outboard side of the outer ring member 11. The dam portion 35 is formed over the entire circumference of the seal member 16. The side surface on the inboard side of the outer diameter flange portion 22 is abutted against the outboard side end surface of the outer ring member 11 with a part of the dam portion 35 interposed.

そして、図２に示すように、堰部３５のインボード側の側面には、複数の突起４０が形成されている。そして、複数の突起４０は、フランジ部１２ｃが回転する時（車両走行時）に外輪部材１１の周囲に発生する回転気流を乱流化するボルテックスジェネレータである。 Then, as shown in FIG. 2, a plurality of protrusions 40 are formed on the side surface of the dam portion 35 on the inboard side. The plurality of protrusions 40 are vortex generators that turbulently rotate the rotating airflow generated around the outer ring member 11 when the flange portion 12c rotates (when the vehicle is traveling).

複数の突起４０は、堰部３５の全周に亘って略等間隔に１列で形成されている。また、突起４０は、非接触リップ３４よりも径方向外側となる位置に設けられている。また、突起４０は、部分球状（略半球状）に形成されている。なお、突起４０の形状は、部分球状（略半球状）に限定されず、円筒状、円柱状、多角柱状、浮き出し文字など、種々の形状を選択可能である。また、突起４０の配置は、複数の突起４０を全周に亘って略等間隔に形成する形態に限定されず、例えば、所定数（例えば３つ）の突起４０を１グループとして、複数（例えば４つ）のグループを周方向に間欠的に形成するようにしてもよい。 The plurality of protrusions 40 are formed in one row at substantially equal intervals over the entire circumference of the dam portion 35. Further, the protrusion 40 is provided at a position radially outside the non-contact lip 34. The protrusion 40 is formed in a partially spherical shape (substantially hemispherical shape). The shape of the protrusion 40 is not limited to the partial spherical shape (substantially hemispherical shape), and various shapes such as a cylindrical shape, a cylindrical shape, a polygonal pillar shape, and an embossed character can be selected. Further, the arrangement of the protrusions 40 is not limited to the form in which the plurality of protrusions 40 are formed at substantially equal intervals over the entire circumference. For example, a predetermined number (for example, three) of protrusions 40 is set as one group and a plurality of (for example, The four groups may be formed intermittently in the circumferential direction.

以上説明したように、本実施形態のハブユニット軸受１０によれば、シール部材１６の堰部３５に形成されるボルテックスジェネレータとなる複数の突起４０により、フランジ部１２ｃが回転する時に外輪部材１１の周囲（特に堰部３５の周辺）に発生する回転気流を乱流化することができる。このため、水滴を含んだ回転気流が非接触リップ３４よりも径方向内側に侵入することを防止して、回転気流に取り込まれた水滴がシールリップ（第１〜第３接触リップ３１〜３３）の摺接点に接近するのを防止することができる。 As described above, according to the hub unit bearing 10 of the present embodiment, the plurality of protrusions 40 serving as vortex generators formed on the dam portion 35 of the seal member 16 cause the outer ring member 11 to rotate when the flange portion 12c rotates. The rotating airflow generated around (particularly around the dam portion 35) can be made turbulent. Therefore, the rotary air flow containing the water droplets is prevented from entering the inside of the non-contact lip 34 in the radial direction, and the water droplets taken into the rotary air flow are the seal lips (first to third contact lips 31 to 33). It is possible to prevent the sliding contact from approaching.

次に、本実施形態の第１変形例として、図３に示すように、複数の突起４０は、堰部３５のインボード側の側面に、２列で形成されていてもよい。本変形例では、複数の突起４０は、堰部３５のインボード側の側面に、周方向に沿って２列で千鳥状に配置されている。なお、複数の突起４０の配置は、２列に限定されず、３列以上であってもよい。 Next, as a first modified example of the present embodiment, as shown in FIG. 3, the plurality of protrusions 40 may be formed in two rows on the side surface of the dam portion 35 on the inboard side. In this modification, the plurality of protrusions 40 are arranged in two rows along the circumferential direction in a staggered manner on the side surface of the dam portion 35 on the inboard side. The arrangement of the plurality of protrusions 40 is not limited to two rows and may be three rows or more.

次に、本実施形態の第２変形例として、図４に示すように、複数の突起４０は、堰部３５のアウトボード側の側面に、１列で形成されていてもよい。この場合も、上記した第１変形例のように、複数の突起４０は、２列以上形成されていてもよい。 Next, as a second modified example of the present embodiment, as shown in FIG. 4, the plurality of protrusions 40 may be formed in one row on the side surface of the dam portion 35 on the outboard side. Also in this case, as in the first modification described above, the plurality of protrusions 40 may be formed in two or more rows.

次に、本実施形態の第３変形例として、図５に示すように、複数の突起４０は、堰部３５の外径面に、１列で形成されていてもよい。但し、本変形例の場合、成形型の分割面ＰＬの位置関係により、加硫成形時に無理抜きが発生して、突起４０を大きくすることができない。 Next, as a third modified example of the present embodiment, as shown in FIG. 5, the plurality of protrusions 40 may be formed in one row on the outer diameter surface of the dam portion 35. However, in the case of this modification, due to the positional relationship of the dividing surfaces PL of the molding die, forcible removal occurs during vulcanization molding, and the protrusion 40 cannot be enlarged.

次に、本実施形態の第４変形例として、図６に示すように、複数の突起４０は、堰部３５の外径面に形成され、且つ突起４０の頂部が堰部３５のインボード側の側面の延長線上に位置するように形成されていてもよい。この場合、突起４０は、概ね４分の１の球状に形成される。また、本変形例の場合、成形型の分割面ＰＬを堰部３５のインボード側の側面の延長線上に配置することにより、加硫成形時の無理抜きを回避して、突起４０を大きくすることができる。 Next, as a fourth modified example of the present embodiment, as shown in FIG. 6, the plurality of protrusions 40 are formed on the outer diameter surface of the dam portion 35, and the tops of the protrusions 40 are on the inboard side of the dam portion 35. It may be formed so as to be located on the extension line of the side surface of the. In this case, the protrusion 40 is formed into a spherical shape having a size of about a quarter. Further, in the case of this modification, the dividing surface PL of the molding die is arranged on the extension line of the side surface of the dam portion 35 on the inboard side, thereby avoiding forcible removal during vulcanization molding and enlarging the projection 40. be able to.

次に、本実施形態の第５変形例として、図７に示すように、複数の突起４０は、堰部３５の外径面に形成され、且つ突起４０の頂部が堰部３５のアウトボード側の側面の延長線上に位置するように形成されていてもよい。この場合、突起４０は、概ね４分の１の球状に形成される。また、本変形例の場合、成形型の分割面ＰＬを堰部３５のアウトボード側の側面の延長線上に配置することにより、加硫成形時の無理抜きを回避して、突起４０を大きくすることができる。 Next, as a fifth modified example of the present embodiment, as shown in FIG. 7, a plurality of protrusions 40 are formed on the outer diameter surface of the dam portion 35, and the tops of the protrusions 40 are on the outboard side of the dam portion 35. It may be formed so as to be located on the extension line of the side surface of the. In this case, the protrusion 40 is formed into a spherical shape having a size of about a quarter. Further, in the case of this modification, the dividing surface PL of the molding die is arranged on the extension line of the side surface of the weir portion 35 on the outboard side, so as to avoid excessive removal during vulcanization molding and enlarge the projection 40. be able to.

次に、本実施形態の第６変形例として、図８に示すように、複数の突起４０は、堰部３５のインボード側の側面から外径面に亘って形成されていてもよい。この場合、突起４０は、概ね４分の３の球状に形成される。本変形例によれば、堰部３５のインボード側の側面と外径面の両方に突起４０が突出するため、図１〜図７に示す形態と比較して、回転気流を乱流化する効果を高めて、回転気流に取り込まれた水滴がシールリップ（第１〜第３接触リップ３１〜３３）の摺接点に接近するのを更に防止することができる。また、本変形例の場合、成形型の分割面ＰＬを堰部３５のインボード側の側面の延長線上に配置することにより、加硫成形時の無理抜きを回避して、突起４０を大きくすることができる。 Next, as a sixth modified example of the present embodiment, as shown in FIG. 8, the plurality of protrusions 40 may be formed from the side surface on the inboard side of the dam portion 35 to the outer diameter surface. In this case, the protrusion 40 is formed into a roughly three-quarter spherical shape. According to this modification, the protrusions 40 project on both the side surface of the weir portion 35 on the inboard side and the outer diameter surface, so that the rotating airflow is made turbulent as compared with the configurations shown in FIGS. 1 to 7. It is possible to further enhance the effect and further prevent the water droplets taken into the rotating airflow from approaching the sliding contact points of the seal lips (first to third contact lips 31 to 33). Further, in the case of this modification, the dividing surface PL of the molding die is arranged on the extension line of the side surface of the weir portion 35 on the inboard side, so as to avoid excessive removal during vulcanization molding and enlarge the projection 40. be able to.

次に、本実施形態の第７変形例として、図９に示すように、複数の突起４０は、堰部３５のアウトボード側の側面から外径面に亘って形成されていてもよい。この場合、突起４０は、概ね４分の３の球状に形成される。本変形例によれば、堰部３５のアウトボード側の側面と外径面の両方に突起４０が突出するため、図１〜図７に示す形態と比較して、回転気流を乱流化する効果を高めて、回転気流に取り込まれた水滴がシールリップ（第１〜第３接触リップ３１〜３３）の摺接点に接近するのを更に防止することができる。また、本変形例の場合、成形型の分割面ＰＬを堰部３５のアウトボード側の側面の延長線上に配置することにより、加硫成形時の無理抜きを回避して、突起４０を大きくすることができる。 Next, as a seventh modified example of the present embodiment, as shown in FIG. 9, the plurality of protrusions 40 may be formed from the side surface on the outboard side of the dam portion 35 to the outer diameter surface. In this case, the protrusion 40 is formed into a roughly three-quarter spherical shape. According to this modification, since the projection 40 projects on both the side surface of the weir portion 35 on the outboard side and the outer diameter surface, the rotating airflow is made turbulent as compared with the configurations shown in FIGS. 1 to 7. It is possible to further improve the effect and further prevent the water droplets taken into the rotating airflow from approaching the sliding contacts of the seal lips (first to third contact lips 31 to 33). Further, in the case of this modification, the dividing surface PL of the molding die is arranged on the extension line of the side surface of the weir portion 35 on the outboard side, thereby avoiding forcible removal during vulcanization molding and enlarging the projection 40. be able to.

（第２実施形態）
次に、図１０を参照して、本発明に係る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、上記第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。 (Second embodiment)
Next, a second embodiment of the hub unit bearing according to the present invention will be described with reference to FIG. In addition, about the same or equivalent part as the said 1st Embodiment, the same code|symbol is attached|subjected to drawing and the description is abbreviate|omitted or simplified.

本実施形態では、図１０に示すように、堰部３５に複数の突起４０が形成されておらず、その代わりに、非接触リップ３４の外径面の先端部に、ボルテックスジェネレータとなる複数の突起４１が形成されている。 In the present embodiment, as shown in FIG. 10, a plurality of protrusions 40 are not formed on the dam portion 35, and instead, a plurality of vortex generators serving as vortex generators are provided at the tip of the outer diameter surface of the non-contact lip 34. The protrusion 41 is formed.

複数の突起４１は、非接触リップ３４の全周に亘って略等間隔に１列で形成されている。また、突起４１は、円柱状に形成されている。なお、突起４０の形状は、円柱状に限定されず、部分球状（略半球状）、円筒状、多角柱状、浮き出し文字など、種々の形状を選択可能である。また、突起４１の配置は、複数の突起４１を全周に亘って略等間隔に形成する形態に限定されず、例えば、所定数（例えば３つ）の突起４１を１グループとして、複数（例えば４つ）のグループを周方向に間欠的に形成するようにしてもよい。また、複数の突起４１は、２列以上形成されていてもよい。 The plurality of protrusions 41 are formed in one row at substantially equal intervals over the entire circumference of the non-contact lip 34. Moreover, the protrusion 41 is formed in a cylindrical shape. The shape of the protrusion 40 is not limited to a columnar shape, and various shapes such as a partially spherical shape (substantially hemispherical shape), a cylindrical shape, a polygonal columnar shape, and an embossed character can be selected. Further, the arrangement of the protrusions 41 is not limited to the form in which the plurality of protrusions 41 are formed at substantially equal intervals over the entire circumference. For example, a predetermined number (for example, three) of protrusions 41 is set as one group and a plurality of (for example, The four groups may be formed intermittently in the circumferential direction. Further, the plurality of protrusions 41 may be formed in two or more rows.

以上説明したように、本実施形態のハブユニット軸受１０によれば、シール部材１６の非接触リップ３４に形成されるボルテックスジェネレータとなる複数の突起４１により、フランジ部１２ｃが回転する時に外輪部材１１の周囲（特にラビリンスシールの周辺）に発生する回転気流を乱流化することができる。このため、水滴を含んだ回転気流が非接触リップ３４よりも径方向内側に侵入することを防止して、回転気流に取り込まれた水滴がシールリップ（第１〜第３接触リップ３１〜３３）の摺接点に接近するのを防止することができる。
その他の構成及び作用効果については、上記第１実施形態と同様である。 As described above, according to the hub unit bearing 10 of the present embodiment, the outer ring member 11 is rotated when the flange portion 12c is rotated by the plurality of protrusions 41 that are vortex generators formed on the non-contact lip 34 of the seal member 16. It is possible to turbulent the rotating airflow generated around (particularly around the labyrinth seal). Therefore, the rotary air flow containing the water droplets is prevented from entering the inside of the non-contact lip 34 in the radial direction, and the water droplets taken into the rotary air flow are the seal lips (first to third contact lips 31 to 33). It is possible to prevent the sliding contact from approaching.
Other configurations and operational effects are the same as those in the first embodiment.

なお、本発明は上記各実施形態に例示したものに限定されるものではなく、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、上記第１実施形態の堰部に形成される複数の突起と上記第２実施形態の非接触リップに形成される複数の突起との両方を備えていてもよい。この場合、回転気流を乱流化する効果を高めて、回転気流に取り込まれた水滴がシールリップの摺接点に接近するのを更に防止することができる。
また、上記第１実施形態の場合、非接触リップはなくてもよい。
また、ハブユニット軸受は、図１に示す従動輪用のハブユニット軸受に限定されず、駆動輪用のハブユニット軸受であってもよい。 It should be noted that the present invention is not limited to the examples illustrated in the above embodiments, and can be appropriately changed without departing from the scope of the present invention.
For example, both the plurality of protrusions formed on the weir portion of the first embodiment and the plurality of protrusions formed on the non-contact lip of the second embodiment may be provided. In this case, the effect of making the rotating airflow turbulent can be enhanced to further prevent water droplets taken into the rotating airflow from approaching the sliding contact of the seal lip.
Further, in the case of the first embodiment, the non-contact lip may be omitted.
Further, the hub unit bearing is not limited to the hub unit bearing for the driven wheel shown in FIG. 1 and may be a hub unit bearing for the drive wheel.

１０ハブユニット軸受
１０ａ軸受内部空間
１１外輪部材
１１ａ外輪軌道面
１２ハブ輪（内輪部材）
１２ａ内輪軌道面
１２ｃフランジ部
１３内輪（内輪部材）
１３ａ内輪軌道面
１４玉（転動体）
１５保持器
１６シール部材
１７キャップ
２０芯金
２１円筒部
２２外径鍔部
２３内径鍔部
３０弾性シール部
３１第１接触リップ
３２第２接触リップ
３３第３接触リップ
３４非接触リップ
３５堰部
４０突起（ボルテックスジェネレータ）
４１突起（ボルテックスジェネレータ） 10 hub unit bearing 10a bearing internal space 11 outer ring member 11a outer ring raceway surface 12 hub ring (inner ring member)
12a Inner ring raceway surface 12c Flange portion 13 Inner ring (inner ring member)
13a inner raceway surface 14 balls (rolling elements)
15 Retainer 16 Sealing member 17 Cap 20 Core metal 21 Cylindrical part 22 Outer diameter flange part 23 Inner diameter flange part 30 Elastic seal part 31 First contact lip 32 Second contact lip 33 Third contact lip 34 Non-contact lip 35 Weir part 40 Protrusion (vortex generator)
41 Protrusion (Vortex Generator)

Claims

An outer ring member, an inner ring member rotatably provided with respect to the outer ring member via a plurality of rolling elements, a retainer that holds the plurality of rolling elements at substantially equal intervals in the circumferential direction, the outer ring member and the A hub unit bearing comprising: a seal member for closing an outboard side of a bearing inner space between the inner ring member and the inner ring member,
The inner ring member has a plate-shaped flange portion extending radially outward from the outer diameter surface thereof,
The seal member includes an annular core metal fixed to the inner diameter surface of the outboard side end of the outer ring member, and an elastic seal portion fixed to the core metal,
The elastic seal portion is formed on the inner diameter side of the core metal, is formed on the outer diameter side of at least one contact lip that slidably contacts the inner ring member, and is formed on the outer board side end portion of the outer ring member. A weir portion that projects radially outward from the outer diameter surface,
A hub unit bearing, wherein a plurality of protrusions are formed on the dam portion.

The elastic seal portion further has a non-contact lip provided radially outward of the at least one contact lip.
The hub unit bearing according to claim 1, wherein the plurality of protrusions are formed on the non-contact lip.

An outer ring member, an inner ring member rotatably provided with respect to the outer ring member via a plurality of rolling elements, a retainer that holds the plurality of rolling elements at substantially equal intervals in the circumferential direction, the outer ring member and the A hub unit bearing comprising: a seal member for closing an outboard side of a bearing inner space between the inner ring member and the inner ring member,
The inner ring member has a plate-shaped flange portion extending radially outward from the outer diameter surface thereof,
The seal member includes an annular core metal fixed to the inner diameter surface of the outboard side end of the outer ring member, and an elastic seal portion fixed to the core metal,
The elastic seal portion has at least one contact lip formed on the inner diameter side of the core metal and slidingly contacting the inner ring member, and a non-contact lip provided radially outside the at least one contact lip. Then
A hub unit bearing, wherein a plurality of protrusions are formed on the non-contact lip.

The plurality of protrusions are vortex generators that turbulently rotate a rotating airflow generated around the outer ring member when the flange portion rotates, The vortex generator according to any one of claims 1 to 3, wherein Hub unit bearing.