JP2019196128A - Hub unit bearing - Google Patents

Hub unit bearing Download PDF

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JP2019196128A
JP2019196128A JP2018091862A JP2018091862A JP2019196128A JP 2019196128 A JP2019196128 A JP 2019196128A JP 2018091862 A JP2018091862 A JP 2018091862A JP 2018091862 A JP2018091862 A JP 2018091862A JP 2019196128 A JP2019196128 A JP 2019196128A
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axial direction
hub
wheel
inner ring
pair
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将充 渡部
Masamitsu Watabe
将充 渡部
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 structure capable of improving swinging in the axial direction of an installation surface of a rotary flange caused by rotation of a hub without applying cutting processing to the installation surface.SOLUTION: A hub 3 comprises inner rings 11a and 11b each having one inner ring track 7a, 7b on their respective outer peripheral surfaces of intermediate parts in an axial direction, and a hub wheel 12. The hub wheel 12 comprises a fitting shaft part 16 having the inner rings 11a and 11b out-fitted thereon, a rotary flange 8 lying in a part adjacent to the outer side in the axial direction of the fitting shaft part 16, a caulking part 17 lying in a part adjacent to the inner side in the axial direction of the fitting shaft part 16 and pinching the inner rings 11a and 11b in the axial direction between an inner side part in the radial direction of the rotary flange 8 and itself, a screw hole 21 penetrating respective ones of a plurality of locations in the circumferential direction of an inner side part in the radial direction of the rotary flange 8 in the axial direction, and an installation surface 18 lying on an outer surface in the axial direction of the outer side part in the radial direction of the rotary flange 8 for installing a wheel and a braking rotary member, which form a traveling wheel.SELECTED DRAWING: Figure 1

Description

本発明は、自動車の車輪を懸架装置に対して回転可能に支持するためのハブユニット軸受に関する。   The present invention relates to a hub unit bearing for rotatably supporting automobile wheels with respect to a suspension device.

ハブユニット軸受では、回転輪であるハブは、回転フランジを有し、かつ、回転フランジは、軸方向外側面に車輪を構成するホイール及び制動用回転部材の取付面を有する。このため、静止輪である外輪に対してハブを回転させた場合に、取付面の軸方向振れが大きいと、自動車の操縦安定性や乗り心地に悪影響が出るほか、制動時にブレーキジャダーと呼ばれる異音を伴った振動が発生しやすくなるなどの不都合が生じる。   In the hub unit bearing, the hub which is a rotating wheel has a rotating flange, and the rotating flange has a wheel constituting the wheel and a mounting surface for the rotating member for braking on the outer surface in the axial direction. For this reason, when the hub is rotated with respect to the outer ring, which is a stationary wheel, if the mounting surface has a large axial deflection, the steering stability and riding comfort of the vehicle will be adversely affected. Inconveniences such as vibration with sound tend to occur.

転動体として円すいころを用いたハブユニット軸受では、転動体として玉を用いたハブユニット軸受に比べて、たとえば、円すいころの転動面の頂角や軸方向長さ、円すいころの大径側端面と摺接する大鍔部の側面の傾斜角度や周方向に関する曲がり具合など、部品同士を組み立てたときに取付面の軸方向振れにつながる要素が多い。このため、転動体として円すいころを用いたハブユニット軸受では、部品精度の管理のみによって取付面の軸方向振れを十分に抑えることは難しい。   Compared to a hub unit bearing using a tapered roller as a rolling element, for example, the apex angle and axial length of the rolling surface of the tapered roller, the larger diameter side of the tapered roller There are many elements that lead to axial runout of the mounting surface when parts are assembled, such as the angle of inclination of the side surface of the large collar portion that is in sliding contact with the end surface and the degree of bending in the circumferential direction. For this reason, in a hub unit bearing using a tapered roller as a rolling element, it is difficult to sufficiently suppress axial runout of the mounting surface only by managing component accuracy.

これに対して、特表２００３−５２８７５７号公報には、転動体として円すいころを用いたハブユニット軸受を対象として、ハブユニット軸受を構成する部品同士を組み立てた後、外輪に対してハブを回転させながら取付面に切削加工を施すことによって、取付面の軸方向振れを改善する方法が記載されている。   On the other hand, in Japanese translations of PCT publication No. 2003-528757, for hub unit bearings using tapered rollers as rolling elements, the components constituting the hub unit bearings are assembled together, and then the hub is rotated with respect to the outer ring. A method of improving the axial runout of the mounting surface by performing cutting on the mounting surface is described.

特表２００３−５２８７５７号公報JP-T-2003-528757

しかしながら、転動体として円すいころを用いたハブユニット軸受では、特表２００３−５２８７５７号公報に記載された方法によって完成時の取付面の軸方向振れを十分に抑えられたとしても、使用に伴う経時変化によって、取付面の軸方向振れが悪化しやすい。   However, in a hub unit bearing using a tapered roller as a rolling element, even if the axial runout of the mounting surface at the time of completion is sufficiently suppressed by the method described in JP-T-2003-528757, the time that accompanies use Due to the change, the axial runout of the mounting surface tends to deteriorate.

すなわち、転動体として円すいころを用いたハブユニット軸受では、外輪、ハブ、複数個の円すいころのそれぞれに不可避な製造誤差があるため、軸方向外側列の円すいころの公転速度と軸方向内側列の円すいころの公転速度とは若干異なる。また、これらの公転速度の差は、ハブユニット軸受の負荷状態によっても変化する。このため、軸方向外側列の円すいころと軸方向内側列の円すいころとの周方向に関する位相の関係は、ハブユニット軸受の完成時のままに維持することができず、この関係の変化に伴って取付面の軸方向振れが徐々に悪化する。   In other words, in hub unit bearings using tapered rollers as rolling elements, there are inevitable manufacturing errors in each of the outer ring, the hub, and the plurality of tapered rollers, so the revolution speed of the tapered rollers in the axially outer row and the axially inner row The revolution speed of tapered rollers is slightly different. Further, the difference between these revolution speeds also varies depending on the load state of the hub unit bearing. For this reason, the phase relationship in the circumferential direction between the tapered rollers in the axially outer row and the tapered rollers in the axially inner row cannot be maintained when the hub unit bearing is completed. As a result, the axial runout of the mounting surface gradually deteriorates.

この場合に、取付面の軸方向振れを改善する方法として、再び特表２００３−５２８７５７号公報に記載された方法を用いるのは、回転フランジの肉厚を確保する必要上、好ましくない。   In this case, it is not preferable to use the method described in Japanese Patent Publication No. 2003-528757 again as a method for improving the axial runout of the mounting surface because it is necessary to secure the thickness of the rotating flange.

本発明の目的は、ハブの回転に伴う回転フランジの取付面の軸方向振れを、取付面に切削加工を施すことなく改善することができる構造を実現することにある。   An object of the present invention is to realize a structure capable of improving the axial runout of the mounting surface of the rotating flange accompanying the rotation of the hub without cutting the mounting surface.

本発明のハブユニット軸受は、外輪と、ハブと、複数個の円すいころとを備える。
前記外輪は、内周面に複列の外輪軌道を有する。
前記ハブは、外周面に複列の内輪軌道を有する。
前記円すいころは、前記複列の外輪軌道と前記複列の内輪軌道との間に、それぞれの列ごとに複数個ずつ配置されている。
前記ハブは、それぞれの軸方向中間部外周面に前記内輪軌道を１つずつ有する１対の内輪と、ハブ輪とを含んで構成されている。
前記ハブ輪は、前記１対の内輪が外嵌された嵌合軸部と、前記嵌合軸部の軸方向外側に隣接する部分から径方向外側に突出した回転フランジと、前記嵌合軸部の軸方向内側に隣接する部分に存在し、前記回転フランジの径方向内側部との間で前記１対の内輪を軸方向に挟持するかしめ部と、前記回転フランジの径方向内側部の周方向複数箇所のそれぞれを軸方向に貫通し、かつ、それぞれの軸方向内側の端部が前記１対の内輪のうちの軸方向外側の内輪の軸方向外側の端面に対向する複数のねじ孔と、前記回転フランジの径方向外側部の軸方向外側面に存在する、車輪を構成するホイール及び制動用回転部材を取り付けるための取付面とを有する。 The hub unit bearing of the present invention includes an outer ring, a hub, and a plurality of tapered rollers.
The outer ring has a double row outer ring raceway on an inner peripheral surface.
The hub has double-row inner ring raceways on the outer peripheral surface.
A plurality of the tapered rollers are arranged for each row between the double row outer ring raceway and the double row inner ring raceway.
The hub includes a pair of inner rings having one inner ring raceway on each outer circumferential surface in the axial direction, and a hub ring.
The hub wheel includes a fitting shaft portion on which the pair of inner rings are fitted, a rotating flange projecting radially outward from a portion adjacent to the outside of the fitting shaft portion in the axial direction, and the fitting shaft portion. A caulking portion which is present in a portion adjacent to the inner side in the axial direction of the rotating flange and sandwiches the pair of inner rings in the axial direction between the inner side in the radial direction of the rotating flange, A plurality of screw holes penetrating each of the plurality of locations in the axial direction, and each axially inner end portion facing an axially outer end surface of the inner ring on the axially outer side of the pair of inner rings, And a mounting surface for mounting a wheel and a braking rotating member, which are present on the axially outer surface of the radially outer portion of the rotating flange.

前記１対の内輪のうちの軸方向外側の内輪を、軸方向外側部から径方向外側に突出する大鍔部を有し、かつ、前記大鍔部の軸方向内側面と前記内輪軌道との間に全周にわたる逃げ溝を有するものとし、かつ、前記複数のねじ孔のピッチ円直径を、前記逃げ溝の内接円径よりも小さくすることができる。   The inner ring on the axially outer side of the pair of inner rings has a large collar part protruding radially outward from the axially outer part, and the axially inner side surface of the large collar part and the inner ring raceway It is assumed that there are escape grooves extending around the entire circumference, and the pitch circle diameter of the plurality of screw holes can be made smaller than the inscribed circle diameter of the escape grooves.

本発明のハブユニット軸受によれば、ハブの回転に伴う回転フランジの取付面の軸方向振れを、取付面に切削加工を施すことなく改善することができる。   According to the hub unit bearing of the present invention, axial runout of the mounting surface of the rotating flange accompanying rotation of the hub can be improved without subjecting the mounting surface to cutting.

図１は、実施の形態の第１例のハブユニット軸受を示す断面図である。FIG. 1 is a cross-sectional view showing a hub unit bearing of a first example of an embodiment. 図２は、実施の形態の第１例のハブユニット軸受を軸方向外側から見た図である。FIG. 2 is a view of the hub unit bearing of the first example of the embodiment as viewed from the outside in the axial direction. 図３は、図１の左上部の拡大図である。FIG. 3 is an enlarged view of the upper left portion of FIG.

［実施の形態の第１例］
実施の形態の第１例について、図１〜図３を用いて説明する。 [First example of embodiment]
A first example of the embodiment will be described with reference to FIGS.

本例のハブユニット軸受１は、使用状態で回転しない外輪２と、使用状態で車輪及びディスク、ドラムなどの制動用回転体と共に回転するハブ３と、複数個の円すいころ４とを備える。   The hub unit bearing 1 of the present example includes an outer ring 2 that does not rotate in a use state, a hub 3 that rotates together with a braking rotator such as a wheel, a disk, and a drum in a use state, and a plurality of tapered rollers 4.

なお、ハブユニット軸受１に関して、軸方向外側は、車両に組み付けた状態で車両の幅方向外側となる図１及び図３の左側であり、軸方向内側は、車両に組み付けた状態で車両の幅方向中央側となる図１及び図３の右側である。   In addition, regarding the hub unit bearing 1, the outer side in the axial direction is the left side of FIGS. 1 and 3 which is the outer side in the width direction of the vehicle when assembled in the vehicle, and the inner side in the axial direction is the width of the vehicle in the state assembled in the vehicle. It is the right side of FIG.1 and FIG.3 which becomes a direction center side.

外輪２は、複列の外輪軌道５ａ、５ｂと、静止フランジ６とを有する。複列の外輪軌道５ａ、５ｂは、外輪２の内周面に存在しており、それぞれが軸方向に関する互いの近位側を小径側とする部分円すい面形状を有する。静止フランジ６は、外輪２を懸架装置のナックルに結合するためのもので、外輪２の軸方向中間部から径方向外側に突出している。   The outer ring 2 has double-row outer ring raceways 5 a and 5 b and a stationary flange 6. The double-row outer ring raceways 5a and 5b are present on the inner peripheral surface of the outer ring 2, and each has a partial conical surface shape in which the proximal sides of each other in the axial direction are on the small diameter side. The stationary flange 6 is for connecting the outer ring 2 to the knuckle of the suspension device, and protrudes radially outward from the axial intermediate portion of the outer ring 2.

ハブ３は、外輪２の内径側に外輪２と同軸に配置されており、複列の内輪軌道７ａ、７ｂと、回転フランジ８と、パイロット部９とを有する。複列の内輪軌道７ａ、７ｂは、複列の外輪軌道５ａ、５ｂと対向するハブ３の外周面に存在しており、それぞれが軸方向に関する互いの近位側を小径側とする部分円すい面形状を有する。回転フランジ８は、車輪を構成するホイール及び制動用回転体をハブ３に対して取り付けるためのもので、外輪２よりも軸方向外側に突出したハブ３の軸方向外側部に存在しており、径方向外側に向けて伸長する略円輪形状を有する。パイロット部９は、車輪を構成するホイール及び制動用回転体を外嵌するためのもので、ハブ３の軸方向外側部の径方向中間部から軸方向外側に突出しており、略円筒形状を有する。また、本例のハブユニット軸受１は、駆動輪用であるため、ハブ３は、図示しない駆動軸をスプライン係合させるためのスプライン孔１０を有する。スプライン孔１０は、ハブ３の径方向中心部を軸方向に貫通している。ただし、本発明は、従動輪用のハブユニット軸受にも適用可能である。   The hub 3 is disposed coaxially with the outer ring 2 on the inner diameter side of the outer ring 2, and has double-row inner ring raceways 7 a and 7 b, a rotating flange 8, and a pilot portion 9. The double-row inner ring raceways 7a and 7b are present on the outer peripheral surface of the hub 3 facing the double-row outer ring raceways 5a and 5b, and each of them is a partial conical surface whose proximal side in the axial direction is the small diameter side. Has a shape. The rotating flange 8 is for attaching the wheel constituting the wheel and the rotating body for braking to the hub 3, and is present in the axially outer portion of the hub 3 protruding outward in the axial direction from the outer ring 2, It has a substantially annular shape that extends outward in the radial direction. The pilot portion 9 is for externally fitting a wheel constituting the wheel and a braking rotator, and protrudes outward in the axial direction from the radial intermediate portion of the axially outer portion of the hub 3 and has a substantially cylindrical shape. . Further, since the hub unit bearing 1 of this example is for a drive wheel, the hub 3 has a spline hole 10 for engaging a drive shaft (not shown) with a spline. The spline hole 10 penetrates the central portion in the radial direction of the hub 3 in the axial direction. However, the present invention is also applicable to a hub unit bearing for a driven wheel.

円すいころ４は、複列の外輪軌道５ａ、５ｂと複列の内輪軌道７ａ、７ｂとの間に、それぞれの列ごとに複数個ずつ配置されている。このような構成により、ハブ３が、外輪２の内径側に回転自在に支持されている。   A plurality of tapered rollers 4 are arranged for each row between the double row outer ring raceways 5a and 5b and the double row inner ring raceways 7a and 7b. With such a configuration, the hub 3 is rotatably supported on the inner diameter side of the outer ring 2.

本例では、ハブ３は、１対の内輪１１ａ、１１ｂと、ハブ輪１２とを組み合わせることにより構成されている。   In this example, the hub 3 is configured by combining a pair of inner rings 11 a and 11 b and a hub ring 12.

軸方向外側の内輪１１ａは、外輪２の軸方向外側部の径方向内側に配置されており、軸方向中間部外周面に軸方向外側列の内輪軌道７ａを有する。また、内輪１１ａは、内輪軌道７ａの軸方向内側に隣接する軸方向内側部から径方向外側に突出する小鍔部１３ａを有し、かつ、内輪軌道７ａの軸方向外側に隣接する軸方向外側部から径方向外側に突出する大鍔部１４ａを有する。また、内輪１１ａには、内輪軌道７ａと大鍔部１４ａとの間に、内輪軌道７ａと大鍔部１４ａを研削加工するための逃げ溝１５ａが全周にわたり設けられている。   The inner ring 11a on the outer side in the axial direction is disposed on the radially inner side of the outer side in the axial direction of the outer ring 2, and has an inner ring raceway 7a in the outer row in the axial direction on the outer peripheral surface in the axial direction. Further, the inner ring 11a has a small flange portion 13a that protrudes radially outward from an axial inner side adjacent to the inner side in the axial direction of the inner ring raceway 7a, and an outer side in the axial direction that is adjacent to the outer side in the axial direction of the inner ring raceway 7a. A large collar portion 14a projecting radially outward from the portion. The inner ring 11a is provided with a clearance groove 15a for grinding the inner ring raceway 7a and the large collar part 14a between the inner ring raceway 7a and the large collar part 14a.

軸方向内側の内輪１１ｂは、外輪２の軸方向内側部の径方向内側に配置されており、軸方向中間部外周面に軸方向内側列の内輪軌道７ｂを有する。また、内輪１１ｂは、内輪軌道７ｂの軸方向外側に隣接する軸方向外側部から径方向外側に突出する小鍔部１３ｂを有し、かつ、内輪軌道７ｂの軸方向内側に隣接する軸方向内側部から径方向外側に突出する大鍔部１４ｂを有する。また、内輪１１ｂには、内輪軌道７ｂと大鍔部１４ｂとの間に、内輪軌道７ｂと大鍔部１４ｂを研削加工するための逃げ溝１５ｂが全周にわたり設けられている。１対の内輪１１ａ、１１ｂの互いに対向する軸方向端面同士は当接している。   The inner ring 11b on the inner side in the axial direction is arranged on the inner side in the radial direction of the inner part in the axial direction of the outer ring 2, and has an inner ring raceway 7b in the inner row in the axial direction on the outer peripheral surface in the axial direction intermediate part. Further, the inner ring 11b has a small flange portion 13b that protrudes radially outward from an axial outer side adjacent to the outer side in the axial direction of the inner ring raceway 7b, and is axially inner side adjacent to the inner side in the axial direction of the inner ring raceway 7b. A large collar portion 14b projecting radially outward from the portion. Further, the inner ring 11b is provided with a clearance groove 15b for grinding the inner ring raceway 7b and the large collar portion 14b between the inner ring raceway 7b and the large collar portion 14b. The pair of inner rings 11a and 11b are in contact with each other in the axial end surfaces facing each other.

ハブ輪１２は、１対の内輪１１ａ、１１ｂを外嵌保持する軸部材であり、スプライン孔１０と、嵌合軸部１６と、回転フランジ８と、パイロット部９と、かしめ部１７とを有する。スプライン孔１０は、ハブ輪１２の径方向中心部を軸方向に貫通している。嵌合軸部１６は、ハブ輪１２の軸方向中間部を構成しており、１対の内輪１１ａ、１１ｂが締り嵌めで外嵌されている。回転フランジ８は、嵌合軸部１６の軸方向外側に隣接するハブ輪１２の軸方向外側部から径方向外側に突出しており、略円輪形状を有する。パイロット部９は、内輪１１ａよりも径方向外側に位置する回転フランジ８の径方向中間部から軸方向外側に突出しており、略円筒形状を有する。かしめ部１７は、嵌合軸部１６の軸方向内側に隣接するハブ輪１２の軸方向内側部から径方向外側に突出するように存在している。かしめ部１７は、嵌合軸部１６に１対の内輪１１ａ、１１ｂを締り嵌めで外嵌した後、ハブ輪１２の軸方向内側部を径方向外側に向け塑性変形させることにより形成されたものである。かしめ部１７は、パイロット部９よりも径方向内側に位置する回転フランジ８の径方向内側部との間で、１対の内輪１１ａ、１１ｂを軸方向両側から挟持している。   The hub wheel 12 is a shaft member that externally holds and holds a pair of inner rings 11a and 11b, and includes a spline hole 10, a fitting shaft portion 16, a rotating flange 8, a pilot portion 9, and a caulking portion 17. . The spline hole 10 passes through the central portion in the radial direction of the hub wheel 12 in the axial direction. The fitting shaft portion 16 constitutes an intermediate portion in the axial direction of the hub wheel 12, and a pair of inner rings 11a and 11b are externally fitted by interference fitting. The rotating flange 8 protrudes radially outward from the axially outer portion of the hub wheel 12 adjacent to the axially outer side of the fitting shaft portion 16, and has a substantially annular shape. The pilot portion 9 protrudes outward in the axial direction from the radial intermediate portion of the rotary flange 8 located radially outside the inner ring 11a, and has a substantially cylindrical shape. The caulking portion 17 is present so as to protrude radially outward from the axially inner portion of the hub wheel 12 adjacent to the inner side of the fitting shaft portion 16 in the axial direction. The caulking portion 17 is formed by externally fitting a pair of inner rings 11a and 11b to the fitting shaft portion 16 by plastic fitting and then plastically deforming the axially inner portion of the hub wheel 12 radially outward. It is. The caulking portion 17 sandwiches a pair of inner rings 11 a and 11 b from both sides in the axial direction between the caulking portion 17 and the radially inner portion of the rotary flange 8 positioned radially inward of the pilot portion 9.

回転フランジ８は、パイロット部９よりも径方向外側に位置する径方向外側部の軸方向外側面に、車輪を構成するホイール及び制動用回転部材を取り付けるための取付面１８を有する。回転フランジ８は、パイロット部９よりも径方向外側に位置する径方向外側部の周方向等間隔となる複数箇所（図示の例では５箇所）のそれぞれを軸方向に貫通する複数の取付孔１９を有する。取付孔１９のそれぞれには、ハブボルト２０の基端部である軸方向内側の端部が、圧入により内嵌されている。   The rotating flange 8 has an attachment surface 18 for attaching a wheel constituting the wheel and a braking rotating member to an axially outer surface of a radially outer portion located radially outward from the pilot portion 9. The rotating flange 8 has a plurality of mounting holes 19 penetrating in the axial direction at a plurality of locations (five locations in the example shown in the figure) that are equally spaced in the circumferential direction of the radially outer portion located radially outside the pilot portion 9. Have In each of the mounting holes 19, an end portion on the inner side in the axial direction, which is a base end portion of the hub bolt 20, is fitted by press fitting.

回転フランジ８に車輪を構成するホイール及び制動用回転部材を取り付ける際には、パイロット部９の軸方向内側部の外径面にがたつきのない隙間嵌めで外嵌した制動用回転部材の径方向内側部の軸方向内側面を、取付面１８に当接させる。また、パイロット部９の軸方向外側部の外径面にがたつきのない隙間嵌めで外嵌した車輪を構成するホイールの径方向内側部の軸方向内側面を、制動用回転部材の径方向内側部の軸方向外側面に当接させる。そして、車輪を構成するホイール及び制動用回転部材の径方向内側部を軸方向に貫通したハブボルト２０のそれぞれの先端部に、ハブナットを螺合する。これにより、回転フランジ８に車輪を構成するホイール及び制動用回転部材を結合固定する。ただし、回転フランジが備える取付孔のそれぞれをねじ孔とし、かつ、車輪を構成するホイール及び制動用回転部材の径方向内側部に対して軸方向外側から挿通したハブボルトを取付孔（ねじ孔）に螺合することによって、車輪を構成するホイール及び制動用回転部材を回転フランジに結合固定する構成を採用することもできる。   When attaching the wheel constituting the wheel and the braking rotating member to the rotating flange 8, the radial direction of the braking rotating member that is externally fitted with a clearance fit that does not rattle on the outer diameter surface of the inner portion in the axial direction of the pilot portion 9 The inner side surface in the axial direction is brought into contact with the mounting surface 18. Further, the axially inner surface of the radially inner portion of the wheel constituting the wheel that is externally fitted with a clearance fit that does not rattle on the radially outer surface of the pilot portion 9 on the radially outer side is the radially inner side of the brake rotating member. It is made to contact | abut to the axial direction outer surface of a part. Then, a hub nut is screwed to each tip portion of the hub bolt 20 that penetrates the wheel constituting the wheel and the radially inner portion of the braking rotating member in the axial direction. As a result, the wheel constituting the wheel and the braking rotary member are coupled and fixed to the rotary flange 8. However, each of the mounting holes provided in the rotating flange is a screw hole, and a hub bolt inserted from the outside in the axial direction with respect to the radially inner part of the wheel constituting the wheel and the braking rotating member is used as the mounting hole (screw hole). It is also possible to adopt a configuration in which the wheel constituting the wheel and the braking rotary member are coupled and fixed to the rotary flange by screwing.

回転フランジ８は、パイロット部９よりも径方向内側に位置する径方向内側部の周方向等間隔となる複数箇所（図示の例では８箇所）のそれぞれを軸方向に貫通する複数のねじ孔２１を有する。ねじ孔２１のそれぞれは、内輪１１ａの軸方向外側の端面に対向している。また、本例では、ハブ輪１２の中心軸を中心とする、ねじ孔２１のピッチ円直径ＰＣＤ21が、ハブ輪１２の中心軸を中心とする、内輪１１ａの逃げ溝１５ａの内接円径ｄ15aよりも小さくなっている（ＰＣＤ21＜ｄ15a）。なお、ねじ孔２１は、周方向に関して等間隔に配置されていれば良く、ねじ孔２１の個数は、８個に限らず、適宜の個数を採用することができる。 The rotating flange 8 has a plurality of screw holes 21 penetrating in the axial direction at a plurality of locations (eight locations in the illustrated example) that are equally spaced in the circumferential direction of the radially inner portion located radially inward of the pilot portion 9. Have Each of the screw holes 21 faces the end surface on the outer side in the axial direction of the inner ring 11a. In this example, the pitch circle diameter PCD 21 of the screw hole 21 centered on the central axis of the hub wheel 12 is the inscribed circle diameter of the escape groove 15a of the inner ring 11a centered on the central axis of the hub wheel 12. It is smaller than d 15a (PCD 21 <d 15a ). In addition, the screw holes 21 should just be arrange | positioned at equal intervals regarding the circumferential direction, and the number of the screw holes 21 is not restricted to eight, A suitable number can be employ | adopted.

上述のような構成を有する本例のハブユニット軸受１によれば、ハブ３の回転に伴う回転フランジ８の取付面１８の軸方向振れを、取付面１８に切削加工を施すことなく改善することができる。この点について、以下、具体的に説明する。   According to the hub unit bearing 1 of the present example having the above-described configuration, the axial runout of the mounting surface 18 of the rotating flange 8 accompanying the rotation of the hub 3 is improved without cutting the mounting surface 18. Can do. This point will be specifically described below.

本例のハブユニット軸受１では、回転フランジ８の径方向内側部の周方向等間隔となる複数箇所に、内輪１１ａの軸方向外側の端面に対向するねじ孔２１が存在している。このため、たとえば、何れかのねじ孔２１に図示しない調節ボルトを螺合させ、該調節ボルトの先端面により内輪１１ａの軸方向外側の端面を押圧すれば、該押圧の力に応じた分だけ回転フランジ８が弾性変形することに伴って、取付面１８の周方向の全範囲のうち、前記何れかのねじ孔２１の周方向位置を中心とする所定の周方向範囲が、軸方向外側に変位する。なお、調節ボルトとしては、頭部を有する一般的なボルトを使用することもできるし、六角穴を有し頭部を有しない止めねじなどを使用することもできる。   In the hub unit bearing 1 of the present example, there are screw holes 21 facing the axially outer end face of the inner ring 11a at a plurality of positions at equal intervals in the radial inner portion of the rotary flange 8. For this reason, for example, if an adjusting bolt (not shown) is screwed into any one of the screw holes 21 and the end surface on the outer side in the axial direction of the inner ring 11a is pressed by the tip surface of the adjusting bolt, the amount corresponding to the pressing force is sufficient. As the rotary flange 8 is elastically deformed, a predetermined circumferential range centering on the circumferential position of any one of the screw holes 21 out of the entire circumferential range of the mounting surface 18 is axially outward. Displace. In addition, as an adjustment bolt, the general volt | bolt which has a head can also be used, and the set screw etc. which have a hexagonal hole and do not have a head can also be used.

したがって、たとえば、次のようにして、取付面１８の軸方向振れを改善することができる。まず、図１に示すように、ハブユニット軸受１を組み立てた後、外輪２に対してハブ３を回転させることにより、取付面１８の軸方向振れを測定する。これにより、取付面１８の周方向の全範囲のうち、他の周方向範囲よりも軸方向内側に位置する特定の周方向範囲を確認する。そして、該特定の周方向範囲に存在する少なくとも１つのねじ孔２１に、図示しない調節ボルトを螺合させ、該調節ボルトの先端面により内輪１１ａの軸方向外側の端面を押圧する。これにより、前記特定の周方向範囲の軸方向位置を、前記他の周方向範囲の軸方向位置に近づければ、その分、取付面１８の軸方向振れを改善することができる。   Therefore, for example, the axial runout of the mounting surface 18 can be improved as follows. First, as shown in FIG. 1, after assembling the hub unit bearing 1, the hub 3 is rotated with respect to the outer ring 2 to measure the axial runout of the mounting surface 18. Thereby, the specific circumferential direction range located in the axial direction inner side from the other circumferential direction range is confirmed among the whole circumferential ranges of the mounting surface 18. Then, an adjustment bolt (not shown) is screwed into at least one screw hole 21 existing in the specific circumferential range, and the end surface of the inner ring 11a on the outer side in the axial direction is pressed by the tip surface of the adjustment bolt. Thereby, if the axial position of the specific circumferential range is brought closer to the axial position of the other circumferential range, the axial deflection of the mounting surface 18 can be improved accordingly.

また、本例では、ねじ孔２１のピッチ円直径ＰＣＤ21が、内輪１１ａの逃げ溝１５ａの内接円径ｄ15aよりも小さくなっている（ＰＣＤ21＜ｄ15a）。このため、ねじ孔２１に螺合した図示しない調節ボルトの先端面により内輪１１ａの軸方向外側の端面を押圧した場合に、該押圧の力によって、大鍔部１４ａが軸方向内側に向けて倒れるように弾性変形する量を抑えることができる。 Further, in this embodiment, the pitch circle diameter PCD 21 of the screw hole 21 is smaller than the inscribed circle diameter d 15a of the relief groove 15a of the inner ring 11a (PCD 21 <d 15a) . For this reason, when the end face on the axially outer side of the inner ring 11a is pressed by the tip face of the adjusting bolt (not shown) screwed into the screw hole 21, the large collar part 14a falls down inward in the axial direction by the pressing force. Thus, the amount of elastic deformation can be suppressed.

また、本例のハブユニット軸受１によれば、製造時だけでなく、使用後に軸方向振れの特性（振れの位相や大きさ）が変化した場合でも、メンテナンス時に、取付面１８に切削加工を施すことなく、前記調節ボルトを用いて、取付面１８の軸方向振れを改善することができる。   Further, according to the hub unit bearing 1 of this example, not only at the time of manufacture, but also when the axial runout characteristics (phase and magnitude of runout) change after use, the mounting surface 18 is cut during maintenance. Without application, the adjustment bolt can be used to improve the axial runout of the mounting surface 18.

また、本発明を実施する場合、調節ボルトを螺合したねじ孔２１と位相が１８０度ずれた（中心軸に対して反対側の）ねじ孔１２に、調節ボルトと重量が同等であるバランス調整用ボルトを螺合させる構成とすれば、ハブ３の回転バランスを良好に保ちながら、重量の増加を抑制することができる。
また、本発明を実施する場合には、すべてのねじ孔２１のそれぞれに、その先端面により内輪１１ａの軸方向外側の端面を押圧することが可能な緩み止め付きの調節ボルトを、押圧の有無に関わらず、螺合させておく構成を採用することもできる。 Further, when the present invention is carried out, the balance adjustment in which the weight of the adjustment bolt is equal to that of the adjustment bolt is provided in the screw hole 12 that is 180 degrees out of phase with the screw hole 21 into which the adjustment bolt is screwed. If the construction bolts are screwed together, an increase in weight can be suppressed while maintaining a good balance of rotation of the hub 3.
Further, when the present invention is carried out, an adjustment bolt with a locking stopper capable of pressing the axially outer end surface of the inner ring 11a with the tip surface of each of the screw holes 21 is pressed. Regardless, it is also possible to adopt a configuration in which the screw is engaged.

１ ハブユニット軸受
２ 外輪
３ ハブ
４ 円すいころ
５ａ、５ｂ 外輪軌道
６ 静止フランジ
７ａ、７ｂ 内輪軌道
８ 回転フランジ
９ パイロット部
１０ スプライン孔
１１ａ、１１ｂ 内輪
１２ ハブ輪
１３ａ、１３ｂ 小鍔部
１４ａ、１４ｂ 大鍔部
１５ａ、１５ｂ 逃げ溝
１６ 嵌合軸部
１７ かしめ部
１８ 取付面
１９ 取付孔
２０ ハブボルト
２１ ねじ孔 DESCRIPTION OF SYMBOLS 1 Hub unit bearing 2 Outer ring 3 Hub 4 Tapered roller 5a, 5b Outer ring raceway 6 Static flange 7a, 7b Inner ring raceway 8 Rotating flange 9 Pilot part 10 Spline hole 11a, 11b Inner ring 12 Hub ring 13a, 13b Small flange part 14a, 14b Large Fitting part 15a, 15b Escape groove 16 Fitting shaft part 17 Caulking part 18 Mounting surface 19 Mounting hole 20 Hub bolt 21 Screw hole

Claims (2)

内周面に複列の外輪軌道を有する外輪と、
外周面に複列の内輪軌道を有するハブと、
前記複列の外輪軌道と前記複列の内輪軌道との間に、それぞれの列ごとに複数個ずつ配置された円すいころと、を備え、
前記ハブは、それぞれの軸方向中間部外周面に前記内輪軌道を１つずつ有する１対の内輪と、ハブ輪とを含んで構成されており、
前記ハブ輪は、前記１対の内輪が外嵌された嵌合軸部と、前記嵌合軸部の軸方向外側に隣接する部分から径方向外側に突出した回転フランジと、前記嵌合軸部の軸方向内側に隣接する部分に存在し、前記回転フランジの径方向内側部との間で前記１対の内輪を軸方向に挟持するかしめ部と、前記回転フランジの径方向内側部の周方向複数箇所のそれぞれを軸方向に貫通し、かつ、それぞれの軸方向内側の端部が前記１対の内輪のうちの軸方向外側の内輪の軸方向外側の端面に対向する複数のねじ孔と、前記回転フランジの径方向外側部の軸方向外側面に存在する、車輪を構成するホイール及び制動用回転部材を取り付けるための取付面と、を有する、
ハブユニット軸受。 An outer ring having a double row outer ring raceway on the inner peripheral surface;
A hub having a double-row inner ring raceway on the outer peripheral surface;
A plurality of tapered rollers arranged for each row between the double row outer ring raceway and the double row inner ring raceway,
The hub includes a pair of inner rings each having the inner ring raceway on each outer circumferential surface in the axial direction, and a hub ring.
The hub wheel includes a fitting shaft portion on which the pair of inner rings are fitted, a rotating flange projecting radially outward from a portion adjacent to the outside of the fitting shaft portion in the axial direction, and the fitting shaft portion. A caulking portion which is present in a portion adjacent to the inner side in the axial direction of the rotating flange and sandwiches the pair of inner rings in the axial direction between the inner side in the radial direction of the rotating flange, A plurality of screw holes penetrating each of the plurality of locations in the axial direction, and each axially inner end portion facing an axially outer end surface of the inner ring on the axially outer side of the pair of inner rings, A mounting surface for mounting the wheel constituting the wheel and the rotating member for braking, which is present on the axially outer surface of the radially outer portion of the rotating flange.
Hub unit bearing. 前記１対の内輪のうちの軸方向外側の内輪は、軸方向外側部から径方向外側に突出する大鍔部を有し、かつ、前記大鍔部の軸方向内側面と前記内輪軌道との間に全周にわたる逃げ溝を有しており、
前記複数のねじ孔のピッチ円直径が、前記逃げ溝の内接円径よりも小さくなっている、
請求項１に記載のハブユニット軸受。 The inner ring on the axially outer side of the pair of inner rings has a large collar portion protruding radially outward from the axially outer section, and the axial inner surface of the large collar section and the inner ring raceway There is a clearance groove over the entire circumference in between,
The pitch circle diameter of the plurality of screw holes is smaller than the inscribed circle diameter of the escape groove,
The hub unit bearing according to claim 1.
JP2018091862A 2018-05-11 2018-05-11 Hub unit bearing Pending JP2019196128A (en)

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