JP2021127774A - Hub unit bearing - Google Patents

Hub unit bearing Download PDF

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JP2021127774A
JP2021127774A JP2020020951A JP2020020951A JP2021127774A JP 2021127774 A JP2021127774 A JP 2021127774A JP 2020020951 A JP2020020951 A JP 2020020951A JP 2020020951 A JP2020020951 A JP 2020020951A JP 2021127774 A JP2021127774 A JP 2021127774A
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diameter side
roller portion
side roller
small
tapered
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良雄 神谷
Yoshio Kamiya
良雄 神谷
達男 若林
Tatsuo Wakabayashi
達男 若林
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NSK Ltd
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NSK Ltd
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Abstract

To provide a hub unit bearing capable of suppressing the occurrence of skewing of a tapered roller.SOLUTION: A hub unit bearing 10 is equipped with a tapered roller 20. The tapered roller 20 is divided into two pieces in a roller axis direction of the tapered roller 20, and is equipped with a small diameter side roller portion 21 and a large diameter side roller portion 22. The small diameter side roller portion 21 and the large diameter side roller portion 22 are inserted in the same pocket 15a of a holder 15. While the small diameter side roller portion 21 and the large diameter side roller portion 22 are contacted in the roller axis direction, rolling surfaces 21a and 22a of the small diameter side roller portion 21 and the large diameter side roller portion 22 form the same conical surface.SELECTED DRAWING: Figure 1

Description

本発明は、ハブユニット軸受に関する。 The present invention relates to hub unit bearings.

下記特許文献1に示すような円すいころが使用されるハブユニット軸受は、玉が使用されるハブユニット軸受と比較して、軸受部分の断面高さが小さく、高負荷容量であるため、重量が大きい(軸重が高い)車両のハブユニット軸受として使用されている。 A hub unit bearing in which tapered rollers are used as shown in Patent Document 1 below has a smaller cross-sectional height of the bearing portion and a higher load capacity than a hub unit bearing in which balls are used, so that the weight is heavier. It is used as a hub unit bearing for large vehicles (high shaft weight).

特開2009−204064号公報Japanese Unexamined Patent Publication No. 2009-204064

ところで、円すいころが使用される軸受では、予圧が低い場合、不可避な加工誤差から、スキューと呼ばれる円すいころの進行方向に対する傾き挙動が発生することがある。そして、このスキュー現象は、円すいころの軸方向長さが長いほど、予圧が低いほど、また、円すいころの負荷位置がころの軸方向中心から離れるほど、発生しやすくなる。また、スキューが激しくなると、軸受トルクが上昇し、焼付きや内輪小鍔部の破損の原因となる可能性があった。 By the way, in a bearing in which tapered rollers are used, when the preload is low, tilting behavior in the traveling direction of the tapered rollers, which is called skew, may occur due to unavoidable machining errors. The skew phenomenon is more likely to occur as the axial length of the tapered rollers is longer, the preload is lower, and the load position of the tapered rollers is farther from the axial center of the rollers. Further, when the skew becomes severe, the bearing torque increases, which may cause seizure or damage to the inner ring small flange portion.

そして、上記特許文献1のように円すいころが使用されるハブユニット軸受では、高負荷容量を確保するため、外径の1.5倍以上の比較的長い円すいころが使用されている。また、路面反力に基づくモーメント荷重を負荷しているので、通常は、円すいころの大径側に負荷が偏っている。また、軸受トルクを小さくする要求や焼付き防止のため、あまり大きな予圧を掛けることができない。また、円すいころの大径側端面に形成される凸球面(ころ頭部)と内輪大鍔部との滑り摩擦により、円すいころが傾きやすい。つまり、これらの理由により、円すいころのスキューが発生する可能性が高かった。 In a hub unit bearing in which tapered rollers are used as in Patent Document 1, a relatively long tapered roller having an outer diameter of 1.5 times or more is used in order to secure a high load capacity. Further, since the moment load based on the road surface reaction force is applied, the load is usually biased to the large diameter side of the tapered roller. Further, in order to reduce the bearing torque and prevent seizure, it is not possible to apply a large preload. Further, the tapered roller tends to tilt due to the sliding friction between the convex spherical surface (roller head) formed on the large diameter side end surface of the tapered roller and the inner ring large flange portion. That is, for these reasons, there was a high possibility that tapered roller skew would occur.

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、円すいころのスキューの発生を抑制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-mentioned problems, and an object of the present invention is to provide a hub unit bearing capable of suppressing the occurrence of skew of tapered rollers.

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、複数の円すいころ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、前記複数の円すいころを周方向で略等間隔に保持する保持器と、を備えるハブユニット軸受であって、前記円すいころは、前記円すいころのころ軸方向において2分割されて、小径側ころ部と大径側ころ部とを備え、前記小径側ころ部及び前記大径側ころ部は、前記保持器の同一のポケットに挿入され、前記小径側ころ部と前記大径側ころ部を前記ころ軸方向に接触させた状態において、前記小径側ころ部及び前記大径側ころ部の転動面が同一円すい面を形成する、ハブユニット軸受。
(2)前記小径側ころ部の大径側端面は、平面状に形成され、前記大径側ころ部の小径側端面は、前記大径側ころ部の軸方向長さよりも小さな曲率半径の凸球面状に形成される、(1)に記載のハブユニット軸受。
(3)前記小径側ころ部の大径側端面及び前記大径側ころ部の小径側端面の回転中心に、円すい形状の穴がそれぞれ形成され、前記小径側ころ部の前記穴と前記大径側ころ部の前記穴との間に玉が配置される、(1)に記載のハブユニット軸受。
The above object of the present invention is achieved by the following configuration.
(1) An outer ring member, an inner ring member rotatably provided with respect to the outer ring member via a plurality of tapered rollers, and a cage for holding the plurality of tapered rollers at substantially equal intervals in the circumferential direction are provided. In a hub unit bearing, the tapered roller is divided into two in the roller axial direction of the tapered roller, and includes a small diameter side roller portion and a large diameter side roller portion, and the small diameter side roller portion and the large diameter side roller portion. The portion is inserted into the same pocket of the cage, and in a state where the small diameter side roller portion and the large diameter side roller portion are in contact with each other in the roller axial direction, the small diameter side roller portion and the large diameter side roller portion are in contact with each other. A hub unit bearing in which the rolling surfaces of the bearings form the same tapered surface.
(2) The large-diameter side end surface of the small-diameter side roller portion is formed in a planar shape, and the small-diameter side end surface of the large-diameter side roller portion is a convex with a radius of curvature smaller than the axial length of the large-diameter side roller portion. The hub unit bearing according to (1), which is formed in a spherical shape.
(3) Conical holes are formed at the center of rotation of the large-diameter side end surface of the small-diameter side roller portion and the small-diameter side end surface of the large-diameter side roller portion, respectively, and the hole and the large-diameter of the small-diameter side roller portion are formed. The hub unit bearing according to (1), wherein a ball is arranged between the side roller portion and the hole.

本発明によれば、円すいころは、円すいころのころ軸方向において2分割されて、小径側ころ部と大径側ころ部とを備え、小径側ころ部及び大径側ころ部は、保持器の同一のポケットに挿入され、小径側ころ部と大径側ころ部をころ軸方向に接触させた状態において、小径側ころ部及び大径側ころ部の転動面が同一円すい面を形成する。このため、大径側ころ部にスキューが発生した場合、小径側ころ部が軸受中心側に押され、小径側ころ部が支承する荷重が増加すると共に、小径側ころ部が大径側ころ部を大鍔部側に押して、スキュー状態を直そうとする。これにより、大径側ころ部は、荷重が軽減された状態で大鍔部側に押されるため、スキューが矯正され、正常な回転を取り戻すので、スキューの発生を抑制することができる。 According to the present invention, the tapered roller is divided into two in the roller axial direction of the tapered roller, and includes a small diameter side roller portion and a large diameter side roller portion, and the small diameter side roller portion and the large diameter side roller portion are cages. The rolling surfaces of the small-diameter roller and the large-diameter roller form the same tapered surface when they are inserted into the same pocket and the small-diameter roller and the large-diameter roller are in contact with each other in the roller axis direction. .. Therefore, when skew occurs in the large diameter side roller portion, the small diameter side roller portion is pushed toward the bearing center side, the load supported by the small diameter side roller portion increases, and the small diameter side roller portion becomes the large diameter side roller portion. To the large bearing side to try to correct the skew state. As a result, the large diameter side roller portion is pushed toward the large collar portion in a state where the load is reduced, so that the skew is corrected and the normal rotation is restored, so that the occurrence of skew can be suppressed.

本発明に係るハブユニット軸受の一実施形態を説明する断面図である。It is sectional drawing explaining one Embodiment of the hub unit bearing which concerns on this invention. 図1に示す円すいころを説明する側面図である。It is a side view explaining the tapered roller shown in FIG. 円すいころの第1変形例を説明する側面図である。It is a side view explaining the 1st modification of a tapered roller. 円すいころの第2変形例を説明する側面図である。It is a side view explaining the 2nd modification of a tapered roller. ハブユニット軸受の変形例を説明する断面図である。It is sectional drawing explaining the modification of the hub unit bearing. ハブユニット軸受の他の変形例を説明する断面図である。It is sectional drawing explaining another modification of a hub unit bearing.

以下、本発明に係るハブユニット軸受の一実施形態について、図面に基づいて詳細に説明する。 Hereinafter, an embodiment of the hub unit bearing according to the present invention will be described in detail with reference to the drawings.

本実施形態のハブユニット軸受10は、従動輪タイプのハブユニット軸受であり、図1に示すように、外輪部材である外輪11と、ハブ輪12と、ハブ輪12に一体的に固定される内輪部材である一対の内輪13と、外輪11の内径面と一対の内輪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円すいころ20と、2列の複数の円すいころ20を周方向で略等間隔にそれぞれ保持する一対の保持器15と、外輪11と一対の内輪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。また、図1中の符号CLは、ハブユニット軸受10の回転中心線である。 The hub unit bearing 10 of the present embodiment is a driven wheel type hub unit bearing, and as shown in FIG. 1, is integrally fixed to the outer ring 11, the hub ring 12, and the hub ring 12, which are outer ring members. A pair of inner rings 13 which are inner ring members, a plurality of tapered rollers 20 which are rotatably arranged in two rows between an inner diameter surface of the outer ring 11 and an outer diameter surface of the pair of inner rings 13, and a plurality of two rows. A pair of cages 15 that hold the tapered rollers 20 at substantially equal intervals in the circumferential direction, a seal member 16 that closes the outboard side of the bearing internal space 10a between the outer ring 11 and the pair of inner rings 13, and the bearing internal space. A cap 17 for closing the inboard side of the 10a is provided. The outboard side is the left side of FIG. 1 which is the outer side in the width direction when assembled to the automobile, and the inboard side is the right side of FIG. 1 which is the central side in the width direction. Further, reference numeral CL in FIG. 1 is a rotation center line of the hub unit bearing 10.

外輪11の内径面には、2列の外輪軌道面11a,11aが離間して形成されている。また、一対の内輪13の外径面には、内輪軌道面13aが外輪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13a,13aで構成される2列の軌道には、複数の円すいころ20が転動可能にそれぞれ配置されている。 Two rows of outer ring raceway surfaces 11a and 11a are formed on the inner diameter surface of the outer ring 11 so as to be separated from each other. Further, on the outer diameter surface of the pair of inner rings 13, the inner ring raceway surface 13a is formed corresponding to the outer ring raceway surfaces 11a and 11a of the outer ring 11. A plurality of tapered rollers 20 are rotatably arranged on the two rows of racetracks composed of the outer ring raceway surfaces 11a and 11a and the inner ring raceway surfaces 13a and 13a.

複数の円すいころ20は、背面組み合わせ型(DB)で外輪軌道面11a,11a及び内輪軌道面13a,13aに接触している。これにより、ハブ輪12及び一対の内輪13は、外輪11に対して回転可能となる。 The plurality of tapered rollers 20 are in contact with the outer ring raceway surfaces 11a and 11a and the inner ring raceway surfaces 13a and 13a in a back combination type (DB). As a result, the hub ring 12 and the pair of inner rings 13 can rotate with respect to the outer ring 11.

ハブ輪12のインボード側の外周面には、小径段部12bが形成されており、この小径段部12bに一対の内輪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、一対の内輪13がハブ輪12に固定される。また、かしめ加工によって一対の内輪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 on the outer peripheral surface of the hub ring 12 on the inboard side. After fitting a pair of inner rings 13 to the small-diameter step portion 12b, the end portion of the small-diameter step portion 12b is radially outside. By caulking, the pair of inner rings 13 are fixed to the hub wheels 12. Further, by pressing the pair of inner rings 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 ring 12 is a member having a substantially cylindrical shape, and a plate-shaped flange portion 12c extending radially outward from the outer diameter surface is formed at the outboard side end portion thereof. A plurality of hub bolts 12d for fastening a tire wheel, a brake rotor, etc. (not shown) are provided on the flange portion 12c at equal intervals in the circumferential direction.

内輪13は、内輪13の大径側端部に設けられる大鍔部13bと、内輪13の小径側端部に設けられる小鍔部13cと、を有する。 The inner ring 13 has a large collar portion 13b provided at the large diameter side end portion of the inner ring 13 and a small collar portion 13c provided at the small diameter side end portion of the inner ring 13.

そして、円すいころ20のそれぞれは、図1及び図2に示すように、円すいころ20のころ軸方向において2分割されて、小径側ころ部21と大径側ころ部22とを備える。2分割された小径側ころ部21及び大径側ころ部22は、保持器15の同一のポケット15aに挿入される。なお、図2中の符号Rは、円すいころ20の回転中心線である。 As shown in FIGS. 1 and 2, each tapered roller 20 is divided into two in the roller axial direction of the tapered roller 20, and includes a small diameter side roller portion 21 and a large diameter side roller portion 22. The small-diameter side roller portion 21 and the large-diameter side roller portion 22 divided into two are inserted into the same pocket 15a of the cage 15. The reference numeral R in FIG. 2 is the rotation center line of the tapered rollers 20.

小径側ころ部21は、小径側ころ部21の外周面に設けられるテーパー状の転動面21aと、小径側ころ部21の小径側端部に設けられる小径側端面21bと、小径側ころ部21の大径側端部に設けられる大径側端面21cと、を有する。そして、小径側ころ部21の小径側端面21b及び大径側端面21cは、平面状にそれぞれ形成されている。 The small diameter side roller portion 21 includes a tapered rolling surface 21a provided on the outer peripheral surface of the small diameter side roller portion 21, a small diameter side end surface 21b provided on the small diameter side end portion of the small diameter side roller portion 21, and a small diameter side roller portion. It has a large-diameter side end surface 21c provided at the large-diameter side end portion of 21. The small-diameter side end surface 21b and the large-diameter side end surface 21c of the small-diameter side roller portion 21 are formed in a planar shape, respectively.

大径側ころ部22は、大径側ころ部22の外周面に設けられるテーパー状の転動面22aと、大径側ころ部22の小径側端部に設けられる小径側端面22bと、大径側ころ部22の大径側端部に設けられる大径側端面22cと、を有する。そして、大径側ころ部22の小径側端面22bは、平面状に形成され、大径側ころ部22の大径側端面22cは、所定の曲率半径の凸球面状に形成されている。上記凸球面の中心は、円すいころ20の回転中心線R上に位置している。 The large-diameter side roller portion 22 has a large tapered rolling surface 22a provided on the outer peripheral surface of the large-diameter side roller portion 22 and a small-diameter side end surface 22b provided on the small-diameter side end portion of the large-diameter side roller portion 22. It has a large-diameter side end surface 22c provided at the large-diameter side end portion of the diameter-side roller portion 22. The small-diameter side end surface 22b of the large-diameter side roller portion 22 is formed in a planar shape, and the large-diameter side end surface 22c of the large-diameter side roller portion 22 is formed in a convex spherical shape having a predetermined radius of curvature. The center of the convex spherical surface is located on the rotation center line R of the tapered roller 20.

そして、本実施形態では、小径側ころ部21と大径側ころ部22をころ軸方向に接触させた状態において、小径側ころ部21及び大径側ころ部22の転動面21a,22aが同一円すい面を形成するように構成されている。 Then, in the present embodiment, in a state where the small diameter side roller portion 21 and the large diameter side roller portion 22 are in contact with each other in the roller axial direction, the rolling surfaces 21a and 22a of the small diameter side roller portion 21 and the large diameter side roller portion 22 are formed. It is configured to form the same conical surface.

このように構成されたハブユニット軸受10では、通常回転時は、小径側ころ部21の大径側端面21cと大径側ころ部22の小径側端面22bが密着(面接触)して、小径側ころ部21と大径側ころ部22が同様に回転している。しかし、前述した円すいころ20の大径側への負荷の偏り、及び、円すいころ20の大径側端面22cと大鍔部13bとの滑り摩擦により、大径側ころ部22にスキューが発生した場合、小径側ころ部21が軸受中心側に押され、小径側ころ部21が支承する荷重が増加すると共に、小径側ころ部21が大径側ころ部22を大鍔部13b側に押して、スキュー状態を直そうとする。これにより、大径側ころ部22は、荷重が軽減された状態で大鍔部13b側に押されるため、スキューが矯正され、正常な回転を取り戻すので、スキューの発生を抑制することができる。 In the hub unit bearing 10 configured in this way, during normal rotation, the large-diameter side end surface 21c of the small-diameter side roller portion 21 and the small-diameter side end surface 22b of the large-diameter side roller portion 22 are in close contact (surface contact) to form a small diameter. The side roller portion 21 and the large diameter side roller portion 22 are rotating in the same manner. However, due to the bias of the load on the large diameter side of the tapered roller 20 and the sliding friction between the large diameter side end surface 22c of the tapered roller 20 and the large flange portion 13b, skew occurs on the large diameter side roller portion 22. In this case, the small diameter side roller portion 21 is pushed toward the center of the bearing, the load supported by the small diameter side roller portion 21 increases, and the small diameter side roller portion 21 pushes the large diameter side roller portion 22 toward the large flange portion 13b. Try to fix the skew condition. As a result, the large-diameter side roller portion 22 is pushed toward the large flange portion 13b in a state where the load is reduced, so that the skew is corrected and the normal rotation is restored, so that the occurrence of skew can be suppressed.

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、円すいころ20は、円すいころ20のころ軸方向において2分割されて、小径側ころ部21と大径側ころ部22とを備え、小径側ころ部21と大径側ころ部22をころ軸方向に接触させた状態において、小径側ころ部21及び大径側ころ部22の転動面21a,22aが同一円すい面を形成するため、大径側ころ部22のスキューの発生を抑制することができ、これにより、円すいころ20のスキューの発生を抑制することができる。 As described above, according to the hub unit bearing 10 of the present embodiment, the tapered roller 20 is divided into two in the roller axial direction of the tapered roller 20, and the small diameter side roller portion 21 and the large diameter side roller portion 22 are separated. In the state where the small diameter side roller portion 21 and the large diameter side roller portion 22 are in contact with each other in the roller axial direction, the rolling surfaces 21a and 22a of the small diameter side roller portion 21 and the large diameter side roller portion 22 form the same tapered surface. Therefore, it is possible to suppress the occurrence of skew of the large diameter side roller portion 22, and thereby it is possible to suppress the occurrence of skew of the tapered roller 20.

次に、本実施形態の円すいころ20の第1変形例について説明する。本変形例では、図3に示すように、小径側ころ部21の大径側端面21cは、上記実施形態と同様に、平面状に形成され、大径側ころ部22の小径側端面22bは、大径側ころ部22の軸方向長さLよりも小さな曲率半径Raの凸球面状に形成されている。上記凸球面の中心は、円すいころ20の回転中心線R上に位置している。 Next, a first modification of the tapered roller 20 of the present embodiment will be described. In this modification, as shown in FIG. 3, the large-diameter side end surface 21c of the small-diameter side roller portion 21 is formed in a planar shape as in the above embodiment, and the small-diameter side end surface 22b of the large-diameter side roller portion 22 is formed. , The large-diameter side roller portion 22 is formed in a convex spherical shape having a radius of curvature Ra smaller than the axial length L. The center of the convex spherical surface is located on the rotation center line R of the tapered roller 20.

本変形例によれば、大径側ころ部22にスキューが発生した時の小径側ころ部21の軸受中心側への移動量を小さくすることができる。これにより、小径側ころ部21及び大径側ころ部22の転動面21a,22aのテーパー角が大きい場合に、小径側ころ部21を軸受中心側に押し込み過ぎないようにすることができるので、小径側ころ部21が支承する荷重が過大にならないようにすることができる。 According to this modification, the amount of movement of the small diameter side roller portion 21 toward the bearing center side when skew occurs in the large diameter side roller portion 22 can be reduced. As a result, when the taper angles of the rolling surfaces 21a and 22a of the small diameter side roller portion 21 and the large diameter side roller portion 22 are large, the small diameter side roller portion 21 can be prevented from being pushed too far toward the bearing center side. , The load supported by the small diameter side roller portion 21 can be prevented from becoming excessive.

次に、本実施形態の円すいころ20の第2変形例について説明する。本変形例では、図4に示すように、小径側ころ部21の大径側端面21c及び大径側ころ部22の小径側端面22bの回転中心に、円すい形状の穴23がそれぞれ形成され、小径側ころ部21の穴23と大径側ころ部22の穴23との間に玉24が配置されている。なお、この場合も、小径側ころ部21と大径側ころ部22が玉24を介して接触しているため、小径側ころ部21と大径側ころ部22がころ軸方向に接触した状態である。 Next, a second modification of the tapered roller 20 of the present embodiment will be described. In this modification, as shown in FIG. 4, conical holes 23 are formed at the rotation centers of the large-diameter side end surface 21c of the small-diameter side roller portion 21 and the small-diameter side end surface 22b of the large-diameter side roller portion 22, respectively. A ball 24 is arranged between the hole 23 of the small diameter side roller portion 21 and the hole 23 of the large diameter side roller portion 22. Also in this case, since the small diameter side roller portion 21 and the large diameter side roller portion 22 are in contact with each other via the ball 24, the small diameter side roller portion 21 and the large diameter side roller portion 22 are in contact with each other in the roller axial direction. Is.

本変形例によれば、大径側ころ部22にスキューが発生した時の小径側ころ部21の軸受中心側への移動量を大きくすることができる。これにより、小径側ころ部21及び大径側ころ部22の転動面21a,22aのテーパー角が小さい場合に、小径側ころ部21を軸受中心側に十分に押し込むことができるので、スキュー時において小径側ころ部21が支承する荷重を増加させることができる。また、円すい形状の穴23と玉24の嵌合構造により、大径側ころ部22のラジアル方向の移動を拘束することができるので、大径側ころ部22のスキュー抑制効果を高めることができる。 According to this modification, the amount of movement of the small diameter side roller portion 21 toward the bearing center side when skew occurs in the large diameter side roller portion 22 can be increased. As a result, when the taper angles of the rolling surfaces 21a and 22a of the small diameter side roller portion 21 and the large diameter side roller portion 22 are small, the small diameter side roller portion 21 can be sufficiently pushed toward the bearing center side during skewing. The load supported by the small diameter side roller portion 21 can be increased. Further, since the conical hole 23 and the ball 24 can be fitted to each other to restrain the movement of the large diameter side roller portion 22 in the radial direction, the skew suppression effect of the large diameter side roller portion 22 can be enhanced. ..

なお、本発明は上記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、本実施形態では、アウトボード側の内輪がハブ輪に対して独立しているハブユニット軸受(いわゆる、HUB2.5)に本発明を適用する場合を例示したが、これに限定されず、図5に示すように、アウトボード側の内輪がハブ輪に対して一体成形されているハブユニット軸受(いわゆる、HUB3)に本発明を適用してもよい。
さらに、本実施形態では、従動輪タイプのハブユニット軸受に本発明を適用する場合を例示したが、これに限定されず、図6に示すような駆動輪タイプのハブユニット軸受(図6はHUB3であり、HUB2.5であってもよい)に本発明を適用してもよい。なお、駆動輪タイプ(HUB2.5、HUB3)の場合、内輪は等速ジョイントの外輪端面でも押えることができるので、ハブ輪のインボード側端部のかしめはなくてもよいが、かしめによるインボード側内輪の大鍔部の変形(大鍔部がアウトボード側に倒れ、円すいころの大径側端面と大鍔部との滑り位置が大鍔部側に移動し、滑り摩擦が増加する)を考慮すると、かしめ軸受の方がスキューが発生しやすく、本発明の効果を有効に活用することができる。
また、本発明は、インボード側の円すいころ軸受の構造やサイズと、アウトボード側の円すいころ軸受の構造やサイズが異なる、所謂、異径PCDタイプのハブユニット軸受にも適用可能である。
The present invention is not limited to those exemplified in the above embodiments, and can be appropriately modified 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 (so-called HUB2.5) in which the inner ring on the outboard side is independent of the hub ring has been illustrated, but the present invention is not limited thereto. As shown in FIG. 5, the present invention may be applied to a hub unit bearing (so-called HUB3) in which an inner ring on the outboard side is integrally molded with the hub ring.
Further, in the present embodiment, the case where the present invention is applied to the driven wheel type hub unit bearing has been illustrated, but the present invention is not limited to this, and the drive wheel type hub unit bearing as shown in FIG. 6 (FIG. 6 is HUB3). The present invention may be applied to HUB2.5). In the case of the drive wheel type (HUB2.5, HUB3), the inner ring can also be pressed by the outer ring end surface of the constant velocity joint, so that the inboard side end of the hub wheel does not have to be crimped, but it is in by caulking. Deformation of the large collar of the inner ring on the board side (The large collar falls to the outboard side, the sliding position between the large diameter side end face of the tapered roller and the large collar moves to the large collar side, and the sliding friction increases) In consideration of the above, the caulked bearing is more likely to cause skew, and the effect of the present invention can be effectively utilized.
The present invention is also applicable to so-called different diameter PCD type hub unit bearings in which the structure and size of the tapered roller bearing on the inboard side and the structure and size of the tapered roller bearing on the outboard side are different.

10 ハブユニット軸受
10a 軸受内部空間
11 外輪(外輪部材)
11a 外輪軌道面
12 ハブ輪
13 内輪(内輪部材)
13a 内輪軌道面
13b 大鍔部
15 保持器
15a ポケット
20 円すいころ
21 小径側ころ部
21a 転動面
21b 小径側端面
21c 大径側端面
22 大径側ころ部
22a 転動面
22b 小径側端面
22c 大径側端面
23 穴
24 玉
R 円すいころの回転中心線
CL ハブユニット軸受の回転中心線
L 大径側ころ部の軸方向長さ
Ra 大径側ころ部の小径側端面の曲率半径
10 Hub unit bearing 10a Bearing internal space 11 Outer ring (outer ring member)
11a Outer ring raceway surface 12 Hub ring 13 Inner ring (inner ring member)
13a Inner ring raceway surface 13b Large bearing 15a Pocket 20 Tapered roller 21 Small diameter side roller 21a Rolling surface 21b Small diameter side end surface 21c Large diameter side end surface 22 Large diameter side roller part 22a Rolling surface 22b Small diameter side end surface 22c Large Diameter side end face 23 holes 24 balls R Tapered roller rotation center line CL Hub unit bearing rotation center line L Axial length of large diameter side roller part Ra Radius of curvature of small diameter side end face of large diameter side roller part

Claims (3)

外輪部材と、複数の円すいころ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、前記複数の円すいころを周方向で略等間隔に保持する保持器と、を備えるハブユニット軸受であって、
前記円すいころは、前記円すいころのころ軸方向において2分割されて、小径側ころ部と大径側ころ部とを備え、
前記小径側ころ部及び前記大径側ころ部は、前記保持器の同一のポケットに挿入され、
前記小径側ころ部と前記大径側ころ部を前記ころ軸方向に接触させた状態において、前記小径側ころ部及び前記大径側ころ部の転動面が同一円すい面を形成する、ハブユニット軸受。
A hub unit bearing including an outer ring member, an inner ring member rotatably provided with respect to the outer ring member via a plurality of tapered rollers, and a cage for holding the plurality of tapered rollers at substantially equal intervals in the circumferential direction. And
The tapered roller is divided into two in the roller axial direction of the tapered roller, and includes a small diameter side roller portion and a large diameter side roller portion.
The small diameter side roller portion and the large diameter side roller portion are inserted into the same pocket of the cage.
A hub unit in which the rolling surfaces of the small diameter side roller portion and the large diameter side roller portion form the same conical surface in a state where the small diameter side roller portion and the large diameter side roller portion are in contact with each other in the roller axial direction. bearing.
前記小径側ころ部の大径側端面は、平面状に形成され、
前記大径側ころ部の小径側端面は、前記大径側ころ部の軸方向長さよりも小さな曲率半径の凸球面状に形成される、請求項1に記載のハブユニット軸受。
The large-diameter side end face of the small-diameter side roller portion is formed in a flat shape.
The hub unit bearing according to claim 1, wherein the small-diameter side end surface of the large-diameter side roller portion is formed in a convex spherical shape having a radius of curvature smaller than the axial length of the large-diameter side roller portion.
前記小径側ころ部の大径側端面及び前記大径側ころ部の小径側端面の回転中心に、円すい形状の穴がそれぞれ形成され、
前記小径側ころ部の前記穴と前記大径側ころ部の前記穴との間に玉が配置される、請求項1に記載のハブユニット軸受。
Conical holes are formed at the center of rotation of the large-diameter side end surface of the small-diameter side roller portion and the small-diameter side end surface of the large-diameter side roller portion, respectively.
The hub unit bearing according to claim 1, wherein a ball is arranged between the hole of the small diameter side roller portion and the hole of the large diameter side roller portion.
JP2020020951A 2020-02-10 2020-02-10 Hub unit bearing Pending JP2021127774A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023120639A1 (en) * 2021-12-23 2023-06-29 Ntn株式会社 Tapered roller bearing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023120639A1 (en) * 2021-12-23 2023-06-29 Ntn株式会社 Tapered roller bearing

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