JP2023090469A - Method for assembling hub unit bearing, and hub unit bearing - Google Patents

Method for assembling hub unit bearing, and hub unit bearing Download PDF

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JP2023090469A
JP2023090469A JP2021205435A JP2021205435A JP2023090469A JP 2023090469 A JP2023090469 A JP 2023090469A JP 2021205435 A JP2021205435 A JP 2021205435A JP 2021205435 A JP2021205435 A JP 2021205435A JP 2023090469 A JP2023090469 A JP 2023090469A
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tapered
diameter
pocket
opening
retainer
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洋一郎 小宮山
Yoichiro Komiyama
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NSK Ltd
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Abstract

To provide a method for assembling a hub unit bearing and the hub unit bearing that facilitate work to assemble tapered rollers to a retainer even if the retainer is so configured that the tapered rollers never fall with respect to the hub unit bearing which uses the tapered rollers as rolling elements.SOLUTION: In a fall preventive retainer 20a, a radially inner opening of a pocket 24 is located on an inner diameter side of an axis of rotation of a tapered roller 4a at least at a longitudinally intermediate position of the tapered roller 4a, and a circumferential width thereof is smaller than a diameter of the tapered roller 4a; and a radially outer opening of the pocket 24 is located on an outer diameter side of the axis of rotation of the tapered roller 4a over an entire longitudinal region of the tapered roller 4a and a circumferential width thereof is smaller than the diameter of the tapered roller 4a, and the circumferential width of the radially outer opening of the pocket 24 is smaller than the circumferential width of the radially inner opening of the pocket 24. The tapered roller 4a is inserted from the radially outer opening of the pocket 24 by deforming a column part 23.SELECTED DRAWING: Figure 5

Description

本発明は、自動車の車輪を懸架装置に対して回転自在に支持するためのハブユニット軸受の組立方法及びハブユニット軸受に関する。 The present invention relates to a method for assembling a hub unit bearing for rotatably supporting a wheel of an automobile with respect to a suspension system, and the hub unit bearing.

自動車の車輪は、懸架装置に対して、ハブユニット軸受により回転自在に支持されている。また、重量の嵩む自動車の車輪を回転自在に支持するためのハブユニット軸受には、転動体として円すいころを使用することが行われている。
また、ハブユニット軸受としては、内輪軌道をそれぞれ有する一対の内輪がハブに組み込まれる、いわゆる第一世代や第二世代のハブユニット軸受のほか、近年、部品点数を減らし、コストの低減を図ることなどを目的として、片側の内輪軌道をハブ輪の外周面に直接形成した、いわゆる第三世代と呼ばれるハブユニット軸受が使用されている。
A vehicle wheel is rotatably supported by a hub unit bearing with respect to a suspension system. Tapered rollers are used as rolling elements in hub unit bearings for rotatably supporting heavy wheels of automobiles.
As for hub unit bearings, in addition to the so-called first and second generation hub unit bearings, in which a pair of inner rings, each having an inner ring raceway, are incorporated into the hub, the number of parts has been reduced in recent years to reduce costs. For these purposes, so-called third-generation hub unit bearings are used in which the inner ring raceway on one side is formed directly on the outer peripheral surface of the hub wheel.

単列の円すいころ軸受や、第一世代や第二世代のハブユニット軸受においては、図7に示すように、内輪101に円すいころ102を組み込む際には、保持器103の小径円環部104を鉛直方向下方に向けて設置し、各ポケットに、径方向内側から、円すいころ102を組み付ける。その後、上方から、内輪101が同軸に組み付けられ、複数の円すいころ102が内輪軌道面101aに沿って配置される(例えば、特許文献1参照)。 In single-row tapered roller bearings and first- and second-generation hub unit bearings, as shown in FIG. is installed facing vertically downward, and tapered rollers 102 are assembled in each pocket from the radially inner side. After that, the inner ring 101 is coaxially assembled from above, and a plurality of tapered rollers 102 are arranged along the inner ring raceway surface 101a (see Patent Document 1, for example).

一方、特許文献2に記載の第三世代のハブユニット軸受200では、図8に示すように、まず、軸方向外側の円すいころ201aと保持器202aとを組み合わせ、これらを外輪203の軸方向外側の外輪軌道203aの内側に配置する。その後、外輪203の軸方向外端部に、外側密封部材204を装着する。次いで、ハブ輪205を、外輪203の内径側に挿入する。
また、軸方向内側の円すいころ201bと保持器202bとを組み合わせ、これらを外輪203の軸方向内側の外輪軌道203bの内側に配置し、さらに、小鍔部を有しない内輪206をハブ輪205に組み込む。
On the other hand, in the third-generation hub unit bearing 200 described in Patent Document 2, as shown in FIG. is arranged inside the outer ring raceway 203a. After that, the outer sealing member 204 is attached to the axially outer end of the outer ring 203 . Next, the hub ring 205 is inserted into the inner diameter side of the outer ring 203 .
Further, the axially inner tapered rollers 201b and the retainer 202b are combined and arranged inside the outer ring raceway 203b on the axially inner side of the outer ring 203, and the inner ring 206 having no small flange portion is attached to the hub ring 205. Incorporate.

このようなハブユニット軸受200を組み立てる際には、軸方向外側の保持器202a、及び、小鍔部を有しない内輪206を使用する軸方向内側の保持器202bは、いずれも単独で円すいころ201a,201bを保持する機能が求められている。このため、図9に示すように、保持器202a,202bは、ポケットの径方向内側の開口部の円周方向幅Win及びポケットの径方向外側の開口部の円周方向幅Woutを円すいころ201a,201bの直径Dよりも小さくし、円すいころ201a,201bをポケット内に組み込む作業は、円すいころ201a,201bをポケットの径方向内側から、柱部207を円周方向に押し拡げるようにして行うことが記載されている。 When assembling such a hub unit bearing 200, both the axially outer retainer 202a and the axially inner retainer 202b using the inner ring 206 without a small flange portion are used independently of the tapered rollers 201a. , 201b is required. For this reason, as shown in FIG. 9, the retainers 202a and 202b are configured such that the circumferential width Win of the radially inner opening of the pocket and the circumferential width Wout of the radially outer opening of the pocket are equal to the tapered rollers 201a. , 201b are made smaller than the diameter D, and the tapered rollers 201a and 201b are incorporated into the pocket by pushing the tapered rollers 201a and 201b from the radially inner side of the pocket and expanding the column portion 207 in the circumferential direction. is stated.

特開2020-29899号公報Japanese Patent Application Laid-Open No. 2020-29899 特開2020-67149号公報JP 2020-67149 A

ところで、このような保持器202a,202bは、柱部207によって円すいころ201a、201bを内径側で保持するため、保持器202a,202bの内径が小さくなり、ポケットに円すいころ201a,201bを挿入する際のストロークが長くなる。このため、自動ころ挿入機も大きくなり、保持器202a,202bと円すいころ201a,201bのサイズによっては、自動ころ挿入機を用いた円すいころの組み込み作業が困難になる。 By the way, since the cages 202a and 202b as described above hold the tapered rollers 201a and 201b on the inner diameter side by the column portion 207, the inner diameter of the cages 202a and 202b becomes small, and the tapered rollers 201a and 201b are inserted into the pockets. The final stroke becomes longer. Therefore, the size of the automatic roller inserter also increases, and depending on the sizes of the cages 202a and 202b and the tapered rollers 201a and 201b, it becomes difficult to incorporate the tapered rollers using the automatic roller inserter.

本発明は、上述のような事情に鑑みてなされたものであり、その目的は、転動体として円すいころを使用したハブユニット軸受に関して、円すいころが脱落しない保持器の構成においても、円すいころの保持器への組み込み作業を容易に行うことができる、ハブユニット軸受の組立方法及びハブユニット軸受を提供することにある。 SUMMARY OF THE INVENTION The present invention has been made in view of the circumstances described above, and an object of the present invention is to provide a hub unit bearing using tapered rollers as rolling elements. An object of the present invention is to provide a hub unit bearing assembling method and a hub unit bearing that can be easily assembled into a retainer.

本発明の上記の目的は、以下の構成によって達成される。
(1) 内周面に外輪軌道を有する外輪と、
外周面に内輪軌道を有するハブと、
前記外輪軌道と前記内輪軌道との間に配置された複数の円すいころと、
前記円すいころを転動自在に保持する保持器と、を備え、
前記保持器は、前記円すいころを径方向に脱落不能に保持できるころ脱落防止保持器である、
ハブユニット軸受の組立方法であって、
前記保持器は、小径円環部と、前記小径円環部よりも大きな外径を有する大径円環部と、円周方向に関して等間隔に配置され、前記小径円環部と前記大径円環部とを軸方向に連結する複数の柱部とを備え、円周方向に隣り合う前記柱部同士の間部分を、前記円すいころを転動自在に保持するためのポケットとしたものであり、
前記ポケットの径方向内側の開口部は、前記円すいころの長手方向の少なくとも中間位置において、前記円すいころの自転軸よりも内径側に位置しており、その円周方向幅は、前記円すいころの直径よりも小さくなっており、
前記ポケットの径方向外側の開口部は、前記円すいころの長手方向の全域において、前記円すいころの自転軸よりも外径側に位置しており、その円周方向幅は、前記円すいころの直径よりも小さく、
前記ポケットの径方向外側の開口部の円周方向幅は、前記ポケットの径方向内側の開口部の円周方向幅よりも小さく、
前記円すいころは、前記柱部を変形させて、前記ポケットの径方向外側の開口部から挿入される、
ハブユニット軸受の組立方法。
(2) 前記円すいころの長手方向の中間位置において、前記ポケットの径方向内側の開口部の円周方向幅をA、前記ポケットの径方向外側の開口部の円周方向幅をB、前記円すいころの直径をC、とすると、
A/C=97~99%、B/C=93~97%とする、
(1)に記載のハブユニット軸受の組立方法。
(3) 前記柱部は、互いに略平行な平坦な円周方向両側面を有する柱部本体と、前記柱部本体の円周方向両側面の径方向外側から円周方向に向かって徐々に先細に突出して前記円すいころの長手方向に沿って延びる一対の爪部を有し、
前記ポケットの径方向内側の開口部の円周方向幅は、前記円周方向に隣り合う柱部の円周方向側面の内径側端部によって規定され、
前記ポケットの径方向外側の開口部の円周方向幅は、前記円周方向に隣り合う柱部の爪部の先端部によって規定される、
(1)又は(2)に記載のハブユニット軸受の組立方法。
(4) 前記保持器は、前記小径円環部の外周面から前記柱部の小径円環部側の外周面にかけて面取りが設けられている、
(1)~(3)のいずれかに記載のハブユニット軸受の組立方法。
(5) 内周面に外輪軌道を有する外輪と、
外周面に内輪軌道を有するハブと、
前記外輪軌道と前記内輪軌道との間に配置された複数の円すいころと、
前記円すいころを転動自在に保持する保持器と、を備え、
前記保持器は、前記円すいころを径方向に脱落不能に保持できるころ脱落防止保持器である、ハブユニット軸受であって、
前記保持器は、小径円環部と、前記小径円環部よりも大きな外径を有する大径円環部と、円周方向に関して等間隔に配置され、前記小径円環部と前記大径円環部とを軸方向に連結する複数の柱部とを備え、円周方向に隣り合う前記柱部同士の間部分を、前記円すいころを転動自在に保持するためのポケットとしたものであり、
前記ポケットは、径方向外側の開口部と、外径側に向かうに従い互いの間隔が狭くなる方向に傾いた一対の外径側テーパ面と、前記外径側テーパ面の内径側端部と屈曲点を介して接続され、内径側に向かうに従い互いに間隔が狭くなる方向に傾いた一対の内径側テーパ面と、径方向内側の開口部と、を有して略六角形状に形成され、
前記外径側テーパ面の径方向長さは、前記内径側テーパ面の径方向長さより短く、
前記径方向外側の開口部の円周方向幅は、前記径方向内側の開口部の円周方向幅よりも小さく、
前記径方向外側の開口部の円周方向幅、及び前記径方向内側の開口部の円周方向幅は、前記円すいころの直径よりも小さい、
ハブユニット軸受。
The above objects of the present invention are achieved by the following configurations.
(1) an outer ring having an outer ring raceway on its inner peripheral surface;
a hub having an inner ring raceway on its outer peripheral surface;
a plurality of tapered rollers arranged between the outer ring raceway and the inner ring raceway;
a retainer that retains the tapered rollers in a rollable manner,
The retainer is a roller drop-off prevention retainer capable of retaining the tapered rollers in a radial direction so as not to fall off.
A method for assembling a hub unit bearing, comprising:
The retainer has a small-diameter ring portion and a large-diameter ring portion having an outer diameter larger than that of the small-diameter ring portion, and is arranged at equal intervals in a circumferential direction. and a plurality of pillars for axially connecting the annular portion, and pockets between the pillars adjacent in the circumferential direction are pockets for holding the tapered rollers so that they can roll freely. ,
The radially inner opening of the pocket is located on the inner diameter side of the rotation axis of the tapered roller at least at an intermediate position in the longitudinal direction of the tapered roller, and has a width in the circumferential direction of the tapered roller. is smaller than the diameter,
The radially outer opening of the pocket is located on the outer diameter side of the rotation axis of the tapered roller over the entire length of the tapered roller, and the width in the circumferential direction is equal to the diameter of the tapered roller. smaller than
the circumferential width of the radially outer opening of the pocket is less than the circumferential width of the radially inner opening of the pocket;
The tapered roller deforms the column portion and is inserted from the radially outer opening of the pocket.
A method of assembling a hub unit bearing.
(2) At an intermediate position in the longitudinal direction of the tapered roller, A is the circumferential width of the radially inner opening of the pocket, B is the circumferential width of the radially outer opening of the pocket, and the tapered roller is Assuming that the diameter of the roller is C,
A / C = 97 to 99%, B / C = 93 to 97%,
A method for assembling the hub unit bearing according to (1).
(3) The pillar includes a pillar body having flat circumferential side surfaces substantially parallel to each other, and both circumferential side surfaces of the pillar body gradually tapering in the circumferential direction from the outside in the radial direction. having a pair of claws projecting outward and extending along the longitudinal direction of the tapered rollers,
the circumferential width of the radially inner opening of the pocket is defined by the inner diameter side end of the circumferential side surface of the circumferentially adjacent column;
The circumferential width of the radially outer opening of the pocket is defined by the tips of the claws of the pillars adjacent to each other in the circumferential direction,
A hub unit bearing assembly method according to (1) or (2).
(4) The retainer is chamfered from the outer peripheral surface of the small-diameter annular portion to the outer peripheral surface of the column portion on the side of the small-diameter annular portion.
A method for assembling a hub unit bearing according to any one of (1) to (3).
(5) an outer ring having an outer ring raceway on its inner peripheral surface;
a hub having an inner ring raceway on its outer peripheral surface;
a plurality of tapered rollers arranged between the outer ring raceway and the inner ring raceway;
a retainer that retains the tapered rollers in a rollable manner,
The retainer is a roller drop-off prevention retainer capable of retaining the tapered rollers in a radial direction so that the tapered rollers cannot fall off.
The retainer has a small-diameter ring portion and a large-diameter ring portion having an outer diameter larger than that of the small-diameter ring portion, and is arranged at equal intervals in a circumferential direction. and a plurality of pillars for axially connecting the annular portion, and pockets between the pillars adjacent in the circumferential direction are pockets for holding the tapered rollers so that they can roll freely. ,
The pocket includes an opening on the outside in the radial direction, a pair of outer diameter side tapered surfaces inclined in a direction in which the distance between them narrows toward the outer diameter side, an inner diameter side end portion of the outer diameter side tapered surface, and a bent portion. It is formed in a substantially hexagonal shape having a pair of inner diameter side tapered surfaces connected via a point and inclined in a direction in which the distance between them becomes narrower toward the inner diameter side, and an opening portion on the inner side in the radial direction,
the radial length of the outer diameter tapered surface is shorter than the radial length of the inner diameter tapered surface,
the circumferential width of the radially outer opening is smaller than the circumferential width of the radially inner opening;
the circumferential width of the radially outer opening and the circumferential width of the radially inner opening are smaller than the diameter of the tapered roller;
hub unit bearings.

本発明によれば、転動体として円すいころを使用したハブユニット軸受に関して、円すいころが脱落しない保持器の構成において、円すいころは、柱部を変形させて、ポケットの径方向外側の開口部から挿入されるので、自動ころ挿入機を用いた円すいころの保持器への組み込み作業を容易に行うことができ、また、ポケットの径方向外側の開口部の円周方向幅は、ポケットの径方向内側の開口部の円周方向幅よりも小さくすることにより、内径側の柱部の径方向幅を小さくすることができ、材料の節約、質量やコストの削減を図ることができる。 According to the present invention, with respect to a hub unit bearing using tapered rollers as rolling elements, in a configuration of a retainer in which the tapered rollers do not fall off, the tapered rollers deform the pillars so that the tapered rollers are removed from the radially outer openings of the pockets. Since the tapered rollers are inserted into the retainer using an automatic roller inserter, the circumferential width of the opening on the radially outer side of the pocket is the same as that of the pocket in the radial direction. By making it smaller than the circumferential width of the inner opening, it is possible to reduce the radial width of the pillar on the inner diameter side, thereby saving materials and reducing mass and cost.

また、本発明によれば、外径側テーパ面の径方向長さは、内径側テーパ面の径方向長さより短く、径方向外側の開口部の円周方向幅は、径方向内側の開口部の円周方向幅よりも小さく、径方向外側の開口部の円周方向幅、及び径方向内側の開口部の円周方向幅は、円すいころの直径よりも小さいので、円すいころの直径部分が径方向外側の開口部を乗り越えると直ぐに内径側テーパ面によって所定位置に保持されるので、外径側からの円すいころの組み立て作業が容易になる。
また、ポケットは、外径側テーパ面と内径側テーパ面との間に屈曲点を有することで、円すいころと保持器との接触面積が特許文献2の形状と比べて減少し、摩擦損失を減少することができるので、低トルク化を図ることができる。
Further, according to the present invention, the radial length of the outer diameter side tapered surface is shorter than the radial length of the inner diameter side tapered surface, and the circumferential width of the radially outer opening is equal to the radially inner opening. , and the circumferential width of the radially outer opening and the circumferential width of the radially inner opening are smaller than the diameter of the tapered rollers. As soon as the tapered rollers get over the radially outer opening, they are held in place by the tapered surface on the inner diameter side, which facilitates assembly of the tapered rollers from the outer diameter side.
In addition, since the pocket has a bending point between the tapered surface on the outer diameter side and the tapered surface on the inner diameter side, the contact area between the tapered rollers and the cage is reduced compared to the shape of Patent Document 2, thereby reducing friction loss. Since the torque can be reduced, the torque can be reduced.

図1は、本発明の一実施形態に係るハブユニット軸受を示す、半部断面図である。1 is a half sectional view showing a hub unit bearing according to one embodiment of the present invention; FIG. 図2は、所定のポケットに円すいころを組み込んだ、保持器を内径側から斜め上方に見た斜視図である。FIG. 2 is a perspective view of a retainer in which tapered rollers are incorporated in predetermined pockets, viewed obliquely upward from the inner diameter side. 図3は、保持器の斜視図である。FIG. 3 is a perspective view of the retainer. 図4は、円すいころが組み込まれた保持器の側面図である。FIG. 4 is a side view of a retainer incorporating tapered rollers. 図5は、図4のV-V線に沿った断面図である。5 is a cross-sectional view taken along line VV of FIG. 4. FIG. 図6は、本発明の変形例に係る保持器の一部を破断して示す部分側面図である。FIG. 6 is a partial side view showing a partially broken retainer according to a modification of the present invention. 図7は、従来のハブユニット軸受において、円すいころ及び保持器を、小鍔部を有する内輪に組み込む過程を説明するための図である。FIG. 7 is a diagram for explaining the process of incorporating tapered rollers and a retainer into an inner ring having a small flange portion in a conventional hub unit bearing. 図8は、他の従来のハブユニット軸受の組立工程を説明するための図である。FIG. 8 is a diagram for explaining another conventional hub unit bearing assembly process. 図9は、他の従来のハブユニット軸受の要部断面図である。FIG. 9 is a fragmentary cross-sectional view of another conventional hub unit bearing.

以下、本発明の一実施形態に係るハブユニット軸受の組立方法について、図1~図5を用いて説明する。
本実施形態の組立対象となるハブユニット軸受1は、転動体として円すいころを使用した、いわゆる第三世代と呼ばれるハブユニット軸受であり、大型SUV車や商用車などの自動車の車輪を回転自在に支持するために使用するものである。
A method of assembling a hub unit bearing according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 5. FIG.
The hub unit bearing 1 to be assembled in this embodiment is a so-called third-generation hub unit bearing that uses tapered rollers as rolling elements, and can freely rotate the wheels of automobiles such as large SUVs and commercial vehicles. It is used for support.

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ともに回転するハブ3と、複列の円すいころ4a,4bと、2個の保持器20a,20bと、外側密封部材18と、内側密封部材19とを備えている。
なお、ハブユニット軸受に関して、軸方向外側とは、自動車への組み付け状態で車体の幅方向外側となる、図1の左側を言い、軸方向内側とは、自動車への組み付け状態で車体の幅方向中央側となる、図1の右側を言う。
A hub unit bearing 1 includes an outer ring 2 that does not rotate when in use, a hub 3 that rotates together with a braking rotating body such as a wheel and a disk or a drum when in use, double-row tapered rollers 4a and 4b, and two holding rollers. It comprises vessels 20 a , 20 b , an outer sealing member 18 and an inner sealing member 19 .
Regarding the hub unit bearing, the axially outer side refers to the left side in FIG. It refers to the right side of FIG. 1, which is the center side.

外輪2は、S53Cなどの中炭素鋼製で、略円筒形状を有している。外輪2の外周面の軸方向中間部には、懸架装置のナックルに結合される静止フランジ5を有している。外輪2の内周面には、複列の外輪軌道6a,6bを有している。複列の外輪軌道6a,6bは、それぞれ円すい面形状を有しており、傾斜方向が互いに逆向きである。軸方向外側に位置する外側列の外輪軌道6aは、軸方向外側に向かうほど内径が大きくなり、軸方向内側に位置する内側列の外輪軌道6bは、軸方向内側に向かうほど内径が大きくなる。 The outer ring 2 is made of medium carbon steel such as S53C and has a substantially cylindrical shape. At an axially intermediate portion of the outer peripheral surface of the outer ring 2, it has a stationary flange 5 which is connected to a suspension knuckle. The inner peripheral surface of the outer ring 2 has double-row outer ring raceways 6a and 6b. The double-row outer ring raceways 6a and 6b each have a conical surface shape, and the inclination directions are opposite to each other. The inner diameter of the outer ring raceway 6a in the outer row located axially outward increases toward the axial outer side, and the inner diameter of the outer ring raceway 6b in the inner row located axially inward increases toward the axial inner side.

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、S53Cなどの中炭素鋼製のハブ輪7と、SUJ2などの高炭素クロム鋼製の内輪8とを組み合わせて構成されている。ハブ3の外周面には、複列の内輪軌道10a,10bを有している。複列の内輪軌道10a,10bは、それぞれ円すい面形状を有しており、傾斜方向が互いに逆向きである。軸方向外側に位置する外側列の内輪軌道10aは、軸方向外側に向かうほど外径が大きくなり、軸方向内側に位置する内側列の内輪軌道10bは、軸方向内側に向かうほど外径が大きくなる。 The hub 3 is arranged coaxially with the outer ring 2 on the inner diameter side of the outer ring 2, and is constructed by combining a hub ring 7 made of medium carbon steel such as S53C and an inner ring 8 made of high carbon chromium steel such as SUJ2. ing. The outer peripheral surface of the hub 3 has double-row inner ring raceways 10a and 10b. The double-row inner ring raceways 10a and 10b each have a conical surface shape, and the inclination directions are opposite to each other. The outer diameter of the inner ring raceway 10a in the outer row located axially outward increases toward the axially outer side, and the outer diameter of the inner ring raceway 10b in the inner row located axially inward increases toward the axially inner side. Become.

ハブ輪7は、内輪8を外嵌保持する軸部材であり、軸方向外側から順に、パイロット部12と、回転フランジ9と、大鍔部14aと、外側列の内輪軌道10aと、嵌合軸部11とを有している。 The hub ring 7 is a shaft member for fitting and holding the inner ring 8. From the axial outer side, the hub ring 7 includes a pilot portion 12, a rotary flange 9, a large flange portion 14a, an outer row inner ring raceway 10a, and a fitting shaft. a portion 11;

パイロット部12は、車輪及び制動用回転体を外嵌するためのもので、ハブ輪7の軸方向外側部の径方向中間部から軸方向外側に突出するように設けられており、略円筒形状を有している。回転フランジ9は、車輪及び制動用回転体を取り付けるためのもので、ハブ輪7の軸方向外側部に、径方向外方に突出するように設けられており、略円輪形状を有している。大鍔部14aは、外側列の円すいころ4aの軸方向位置を規制するとともに、外側列の円すいころ4aに作用するアキシャル荷重を支承するためのもので、外側列の内輪軌道10aの軸方向外側に隣接して設けられている。大鍔部14aの軸方向内側面は、径方向外側に向かうほど軸方向内側に向かう方向に傾斜しており、外側列の円すいころ4aの大径側端部と接触対向している。外側列の内輪軌道10aは、ハブ輪7の外周面の軸方向中間部に形成されている。嵌合軸部11は、ハブ輪7の軸方向内側部に設けられており、内輪8が締り嵌めで外嵌されている。嵌合軸部11の外周面とハブ輪7の外周面のうち外側列の内輪軌道10aの軸方向内側に隣接する部分とは、段差面15を介してつながっている。また、嵌合軸部11の軸方向内端部には、径方向外方に折れ曲がったかしめ部16が形成されている。 The pilot portion 12 is for externally fitting a wheel and a braking rotor, and is provided so as to protrude axially outward from the radially intermediate portion of the axially outer portion of the hub wheel 7, and has a substantially cylindrical shape. have. The rotating flange 9 is for attaching a wheel and a braking rotating body, and is provided on the axially outer portion of the hub wheel 7 so as to protrude radially outward, and has a substantially circular ring shape. there is The large flange portion 14a regulates the axial position of the outer row of tapered rollers 4a and supports the axial load acting on the outer row of tapered rollers 4a. located adjacent to. The axial inner side surface of the large flange portion 14a is inclined in the axially inward direction toward the radially outer side, and contacts and faces the large-diameter side end portions of the tapered rollers 4a in the outer row. The inner ring raceway 10 a of the outer row is formed in the axially intermediate portion of the outer peripheral surface of the hub wheel 7 . The fitting shaft portion 11 is provided on the inner side of the hub wheel 7 in the axial direction, and the inner ring 8 is fitted on the outer side by interference fit. The outer peripheral surface of the fitting shaft portion 11 and the portion of the outer peripheral surface of the hub wheel 7 adjacent to the axially inner side of the inner ring raceway 10 a of the outer row are connected via a stepped surface 15 . A crimped portion 16 bent radially outward is formed at the axially inner end portion of the fitting shaft portion 11 .

なお、ハブ輪7の軸方向内端部にかしめ部16を形成する構造に代えて、ハブ輪7の軸方向内端部にナットを螺着する構造を採用することもできる。また、本実施形態のハブユニット軸受1は従動輪用であるため、ハブ輪7は中実状に構成されているが、本発明は、駆動輪用のハブユニット軸受にも適用可能である。駆動輪用のハブユニット軸受に適用する場合には、ハブ輪7の径方向中央部に、駆動軸部材であるスプライン軸を係合させるためのスプライン孔を軸方向に貫通するように形成する。 Instead of forming the caulked portion 16 at the axially inner end of the hub wheel 7, a structure in which a nut is screwed to the axially inner end of the hub wheel 7 may be employed. Further, since the hub unit bearing 1 of the present embodiment is for a driven wheel, the hub wheel 7 is configured in a solid shape, but the present invention is also applicable to hub unit bearings for driving wheels. When applied to a hub unit bearing for a drive wheel, a spline hole for engaging a spline shaft, which is a drive shaft member, is formed in the radial center portion of the hub wheel 7 so as to pass through in the axial direction.

内輪8は、円環形状を有しており、ハブ輪7の軸方向内側部に設けられた嵌合軸部11に締り嵌めで外嵌されている。また、内輪8の軸方向外端面は、段差面15に突
き当てられており、内輪8の軸方向内端面は、かしめ部16により抑え付けられている。内輪8は、外周面の軸方向中間部に、内側列の内輪軌道10bを有している。また、内輪8は、内輪軌道10bの軸方向内側に隣接する軸方向内側部に、径方向外方に突出した大鍔部14bを有している。大鍔部14bは、内側列の円すいころ4bが軸方向に脱落するのを防止するとともに、内側列の円すいころ4bに作用するアキシャル荷重を支承する。
The inner ring 8 has an annular shape, and is fitted onto a fitting shaft portion 11 provided on the inner side in the axial direction of the hub wheel 7 by an interference fit. The axially outer end surface of the inner ring 8 abuts against the stepped surface 15 , and the axially inner end surface of the inner ring 8 is held down by the crimped portion 16 . The inner ring 8 has an inner row of inner ring raceways 10b in the axially intermediate portion of the outer peripheral surface. In addition, the inner ring 8 has a large collar portion 14b protruding radially outward at an axially inner portion adjacent to the axially inner side of the inner ring raceway 10b. The large flange portion 14b prevents the inner row of tapered rollers 4b from slipping off in the axial direction, and supports the axial load acting on the inner row of tapered rollers 4b.

円すいころ4a,4bは、SUJ2などの高炭素クロム鋼製で、それぞれ円すい形状を有している。円すいころ4a,4bは、複列に配置されており、軸方向外側に位置する外側列の円すいころ4aは、外側列の外輪軌道6aと外側列の内輪軌道10aとの間に後述する保持器20aを介して転動自在に配置され、軸方向内側に位置する内側列の円すいころ4bは、内側列の外輪軌道6bと内側列の内輪軌道10bとの間に後述する保持器20bを介して転動自在に配置されている。外側列の円すいころ4aと内側列の円すいころ4bとには、背面組み合わせ型の接触角とともに予圧が付与されている。 The tapered rollers 4a and 4b are made of high carbon chromium steel such as SUJ2, and each have a tapered shape. The tapered rollers 4a and 4b are arranged in double rows, and the outer row of tapered rollers 4a located axially outside is disposed between the outer row of outer ring raceways 6a and the outer row of inner ring raceways 10a. The inner row of tapered rollers 4b, which are arranged to be free to roll via 20a and are positioned axially inward, are interposed between the inner row of the outer ring raceway 6b and the inner row of the inner ring raceway 10b via a retainer 20b, which will be described later. It is rotatably arranged. A preload is applied to the outer row of tapered rollers 4a and the inner row of tapered rollers 4b together with a back-to-back contact angle.

外側密封部材18は、外輪2の軸方向外側部の内周面に内嵌固定されており、外輪2の内周面とハブ3の外周面との間に存在する空間17に封入したグリースが、空間17の軸方向外側開口から漏れ出すことを防止するとともに、外部からの泥水や塵埃が空間17に侵入することを防止している。 The outer sealing member 18 is internally fitted and fixed to the inner peripheral surface of the axially outer portion of the outer ring 2 , and the grease enclosed in the space 17 existing between the inner peripheral surface of the outer ring 2 and the outer peripheral surface of the hub 3 . , and prevents muddy water and dust from entering the space 17 from the outside while preventing leakage from the axially outer opening of the space 17 .

内側密封部材19は、いわゆるカバー部材であり、外輪2の軸方向内側部に内嵌固定されている。内側密封部材19は、金属板製で、全体が有底円筒形状を有しており、外輪2の軸方向内側部の内周面に圧入することで、外輪2の軸方向内側開口を塞いでいる。これにより、空間17に封入したグリースが、外輪2の軸方向内側開口を通じて外部に漏れ出すことを防止するとともに、外部からの泥水や塵埃が空間1713aに侵入することを防止している。なお、内側密封部材19としては、本実施形態のようなカバー部材に代えて、外輪2と内輪8との間に装着する組み合わせシールリングを使用することもできる。 The inner sealing member 19 is a so-called cover member, and is internally fitted and fixed to the inner portion of the outer ring 2 in the axial direction. The inner sealing member 19 is made of a metal plate and has a bottomed cylindrical shape as a whole. there is This prevents the grease sealed in the space 17 from leaking outside through the axially inner opening of the outer ring 2, and prevents muddy water and dust from the outside from entering the space 1713a. As the inner sealing member 19, a combination seal ring mounted between the outer ring 2 and the inner ring 8 can be used instead of the cover member as in this embodiment.

ここで、保持器20a,20bは、かご形保持器と呼ばれるもので、合成樹脂製で、全体が部分円すい筒状に構成されている。保持器20a,20bを構成する合成樹脂としては、例えば、ポリアミド46、ポリアミド66などのポリアミド系樹脂、ポリブチレンテレフタレート、ポリフェニレンサルファイド(PPS)、ポリアミドイミド(PAI)、熱可塑性ポリイミド、ポリエーテルエーテルケトン(PEEK)、ポリエーテルニトリル(PEN)などを使用することができる。また、これらの樹脂に、10~50wt%の繊維状充填材(例えば、ガラス繊維や炭素繊維など)を適宜添加することにより、剛性及び寸法精度を向上させることもできる。 Here, the retainers 20a and 20b are called basket-shaped retainers, are made of synthetic resin, and are formed in a partially conical cylindrical shape as a whole. Synthetic resins forming the retainers 20a and 20b include, for example, polyamide resins such as polyamide 46 and polyamide 66, polybutylene terephthalate, polyphenylene sulfide (PPS), polyamideimide (PAI), thermoplastic polyimide, and polyether ether ketone. (PEEK), polyethernitrile (PEN), and the like can be used. Further, by appropriately adding 10 to 50 wt % of a fibrous filler (for example, glass fiber or carbon fiber) to these resins, rigidity and dimensional accuracy can be improved.

本実施形態では、外側列の保持器20aと内側列の保持器20bとの両方を、円すいころ4a,4bが、保持器20a,20bのポケット24から抜け落ちるのを防止する構造を有する、ころ脱落防止保持器としている。外側列の保持器20aと内側列の保持器20bとは、互いに同一部品であり、ハブユニット軸受1に対する組み付け方向のみが異なる。このため、以下、外側列の保持器20aのみを対象に詳しく説明する。 In this embodiment, both the retainer 20a in the outer row and the retainer 20b in the inner row have a structure that prevents the tapered rollers 4a and 4b from falling out of the pockets 24 of the retainers 20a and 20b. It is used as a preventive retainer. The retainer 20a in the outer row and the retainer 20b in the inner row are the same parts, and differ only in the mounting direction with respect to the hub unit bearing 1. As shown in FIG. Therefore, only the retainer 20a of the outer row will be described in detail below.

保持器20aは、円環状の小径円環部21と、小径円環部21よりも大径で円環状の大径円環部22と、円周方向に関して等間隔に配され、小径円環部21と大径円環部22とを軸方向に連結した複数本の柱部23とを備えている。そして、円周方向に隣り合う柱部23同士の間部分を、ポケット24としている。外側列の保持器20aでは、小径円環部21を軸方向内側に配置し、小径円環部21よりも大きな外径を有する大径円環部22を軸方向外側に配置している。なお、内側列の保持器20bでは、小径円環部21を軸方向外側に配置し、大径円環部22を軸方向内側に配置している。 The retainer 20a has an annular small-diameter ring portion 21 and an annular large-diameter ring portion 22 having a larger diameter than the small-diameter ring portion 21, which are arranged at equal intervals in the circumferential direction. 21 and the large-diameter annular portion 22 are axially connected to each other. Pockets 24 are formed between adjacent pillars 23 in the circumferential direction. In the retainer 20a of the outer row, the small-diameter annular portion 21 is arranged axially inward, and the large-diameter annular portion 22 having an outer diameter larger than that of the small-diameter annular portion 21 is arranged axially outward. In addition, in the retainer 20b of the inner row, the small-diameter annular portion 21 is arranged on the axially outer side, and the large-diameter annular portion 22 is arranged on the axially inner side.

柱部23は、小径円環部21から離れるほど径方向外側に向かう方向に傾斜しており、径方向寸法が軸方向全長にわたり大きくなっている。柱部23の小径側端部は、径方向全幅にわたり小径円環部21に連結されているが、柱部23の大径側端部は、径方向外側部のみが大径円環部22に連結されている。このため、柱部23の大径側部は、大径円環部22よりも径方向内方に突出している。柱部23の径方向外側面は、外側列の外輪軌道6aに対して略平行に配置される。また、柱部23の径方向内側面は、外側列の内輪軌道10aに対して略平行に配置される。このため、ポケット24の径方向内側の開口部24aは、円すいころ4aの長手方向の少なくとも中間位置において、円すいころ4aの自転軸X(図5参照)よりも内径側に位置している。一方、ポケット24の径方向外側の開口部24bは、円すいころ4aの長手方向の全域において、円すいころ4aの自転軸Xよりも外径側に位置している。 The column portion 23 is inclined radially outward with increasing distance from the small-diameter annular portion 21, and the radial dimension is increased over the entire length in the axial direction. The small-diameter end of the column 23 is connected to the small-diameter annular portion 21 over the entire radial width, but only the radial outer portion of the large-diameter end of the column 23 is connected to the large-diameter annular portion 22 . Concatenated. Therefore, the large-diameter side portion of the column portion 23 protrudes radially inward from the large-diameter annular portion 22 . A radial outer surface of the column portion 23 is arranged substantially parallel to the outer ring raceway 6a of the outer row. In addition, the radial inner surface of the column portion 23 is arranged substantially parallel to the inner ring raceway 10a of the outer row. Therefore, the radially inner opening 24a of the pocket 24 is positioned radially inward of the rotation axis X (see FIG. 5) of the tapered roller 4a at least at an intermediate position in the longitudinal direction of the tapered roller 4a. On the other hand, the radially outer opening 24b of the pocket 24 is located on the outer diameter side of the rotation axis X of the tapered roller 4a over the entire length of the tapered roller 4a.

また、柱部23は、互いに略平行な平坦な円周方向両側面(後述する内径側テーパ面に相当)26aを有する平板状の柱部本体26と、柱部本体26の円周方向両側面26aの径方向外側から円周方向に向かって徐々に先細に突出し、円すいころ4aの長手方向に沿って延びる一対の爪部25を有する。 The column 23 is composed of a flat column body 26 having both flat circumferential side surfaces (corresponding to inner diameter side tapered surfaces to be described later) 26a substantially parallel to each other, and both circumferential side surfaces of the column body 26. A pair of claw portions 25 protrude gradually taperingly in the circumferential direction from the radially outer side of 26a and extend along the longitudinal direction of tapered roller 4a.

そして、円周方向に隣り合う柱部23の円周方向側面26aの内径側端部の弦によって規定される、ポケット24の径方向内側の開口部24aの円周方向幅A(図5参照)を、円すいころ4aの直径よりも小さくしている。このような構成により、円すいころ4aがポケット24から径方向内側に脱落することを防止している。また、本実施形態では、円周方向に隣り合う柱部23の爪部25の先端部によって規定される、ポケット24の径方向外側の開口部24bの円周方向幅B(図5参照)についても、円すいころ4aの直径よりも小さくしている。このため、円すいころ4aは、ポケット24から径方向外側に脱落することも防止される。 The circumferential width A of the radially inner opening 24a of the pocket 24 defined by the chord of the radially inner end portion of the circumferential side surface 26a of the pillar 23 adjacent in the circumferential direction (see FIG. 5). is smaller than the diameter of the tapered rollers 4a. Such a configuration prevents the tapered rollers 4a from falling out of the pockets 24 radially inward. Further, in the present embodiment, the circumferential width B (see FIG. 5) of the opening 24b on the radially outer side of the pocket 24, which is defined by the tips of the claws 25 of the pillars 23 adjacent in the circumferential direction, is is also smaller than the diameter of the tapered rollers 4a. Therefore, the tapered rollers 4a are also prevented from falling out of the pockets 24 radially outward.

例えば、図5に示すように、少なくとも円すいころ4aの長手方向の中間位置において、ポケット24の径方向内側の開口部24aの円周方向幅をA、ポケット24の径方向外側の開口部24bの円周方向幅をB、円すいころ4aの直径をC、とすると、A/C=97~99%、B/C=93~97%としている。 For example, as shown in FIG. 5, at least at the longitudinal intermediate position of the tapered rollers 4a, the circumferential width of the radially inner opening 24a of the pocket 24 is A, and the radially outer opening 24b of the pocket 24 is A. Assuming that the circumferential width is B and the diameter of the tapered roller 4a is C, A/C=97 to 99% and B/C=93 to 97%.

このように形成された保持器20aは、円すいころ4aを1個ずつ、爪部25を含む柱部23の変形を伴って、ポケット24の外側から挿入するタイプとしている。また、全てのポケット24に円すいころ4aが挿入され、柱部23の変形がしにくくなった状態では、円すいころ4aの外径側において高い保持力を有する。一方、ポケット24の内径側の保持力は、全てのポケット24に円すいころ4aが挿入され、柱部23の変形がしにくくなった状態だけを考慮して設定されればよく、また、柱部23の円周方向側面26aは剛性が高いため、内径側からの円すいころ4aの脱落防止のための大きな重なり代を必要としない。したがって、柱部23の径方向幅を減らすことができ、材料の節約、質量やコストの削減につなげることができる。
この結果、本実施形態の保持器20aでは、ポケット24の径方向外側の開口部24bの円周方向幅は、ポケット24の径方向内側の開口部24aの円周方向幅よりも小さい。
The retainer 20a formed in this manner is of a type in which the tapered rollers 4a are inserted one by one from the outside of the pocket 24 with deformation of the column portion 23 including the claw portions 25 . Further, in a state in which the tapered rollers 4a are inserted into all the pockets 24 and the column portion 23 is difficult to deform, the tapered rollers 4a have a high holding force on the outer diameter side. On the other hand, the holding force on the inner diameter side of the pockets 24 may be set by taking into account only the state in which the tapered rollers 4a are inserted into all the pockets 24 and the column portions 23 are less likely to deform. Since the circumferential side surface 26a of 23 has high rigidity, it does not require a large overlapping margin for preventing the tapered rollers 4a from falling off from the inner diameter side. Therefore, it is possible to reduce the radial width of the column portion 23, which leads to saving of material and reduction of mass and cost.
As a result, in the retainer 20 a of the present embodiment, the circumferential width of the radially outer opening 24 b of the pocket 24 is smaller than the circumferential width of the radially inner opening 24 a of the pocket 24 .

また、少なくとも円すいころ4aの長手方向の中間位置において、A/C=97~99%、B/C=93~97%に設定することで、円すいころ4aの挿入性、保持性能を確保しつつ、柱部23の径方向幅を減らし、材料の節約、質量やコストの削減につなげることができる。 Further, by setting A/C=97 to 99% and B/C=93 to 97% at least at the intermediate position in the longitudinal direction of the tapered rollers 4a, the insertability and holding performance of the tapered rollers 4a are secured. , the radial width of the column portion 23 can be reduced, leading to saving of material, reduction of mass and cost.

したがって、ハブユニット軸受の組立方法に関して、保持器20a,20bの柱部23を変形させながら、円すいころ4a,4bがポケット24の径方向外側の開口部24bから挿入されて、保持器20a,20bから円すいころ4a,4bが脱落しないようにして、保持器20a,20bと円すいころ4a,4bとをユニット化することができる。その際、自動ころ挿入機は、保持器20a,20bと円すいころ4a,4bのサイズによらずに、ポケット24の径方向外側の開口部24bから爪部25を越えて円すいころ4a,4bを短いストロークでポケット24に挿入することができる。
また、このユニット化された保持器20a,20b及び円すいころ4a,4bを、図8と同様の工程で、軸方向外側の外輪軌道6a及び内輪軌道10aの間、及び軸方向内側の外輪軌道6b及び内輪軌道10bの間に、それぞれ組み込むことができる。
Therefore, regarding the method of assembling the hub unit bearing, the tapered rollers 4a and 4b are inserted from the radially outer openings 24b of the pockets 24 while deforming the column portions 23 of the cages 20a and 20b. The cages 20a, 20b and the tapered rollers 4a, 4b can be unitized by preventing the tapered rollers 4a, 4b from falling off. At that time, the automatic roller inserter inserts the tapered rollers 4a and 4b from the radially outer opening 24b of the pocket 24 beyond the claw portion 25 regardless of the sizes of the cages 20a and 20b and the tapered rollers 4a and 4b. It can be inserted into the pocket 24 with a short stroke.
The cages 20a and 20b and the tapered rollers 4a and 4b, which are unitized, are separated between the axially outer outer ring raceway 6a and the inner ring raceway 10a and the axially inner outer ring raceway 6b in the same process as shown in FIG. and the inner ring raceway 10b.

また、図5に示すように、上述した柱部23の構成によって、ポケット24は、径方向外側の開口部24aと、外径側に向かうに従い互いの間隔が狭くなる方向に傾いた一対の外径側テーパ面25aと、外径側テーパ面25aの内径側端部と屈曲点28を介して接続され、内径側に向かうに従い互いに間隔が狭くなる方向に傾いた一対の内径側テーパ面26aと、径方向内側の開口部24bと、を有して略六角形状に形成される。また、外径側テーパ面25aの径方向長さDは、内径側テーパ面の径方向長さEより短く形成される。 Further, as shown in FIG. 5, due to the above-described structure of the column portion 23, the pocket 24 includes an opening portion 24a on the radially outer side and a pair of outer opening portions inclined in a direction in which the distance between them narrows toward the outer diameter side. A pair of inner diameter side tapered surfaces 26a connected to the inner diameter side end portion of the outer diameter side tapered surface 25a and the outer diameter side taper surface 25a via a bending point 28 and inclined in a direction in which the distance between them narrows toward the inner diameter side. , and a radially inner opening 24b. Further, the radial length D of the outer diameter side tapered surface 25a is shorter than the radial length E of the inner diameter side tapered surface.

以上説明したように、本実施形態のハブユニット軸受1の製造方法によれば、円すいころが脱落しない保持器の構成において、円すいころ4a,4bは、柱部23を変形させて、ポケット24の径方向外側の開口部24bから挿入されるので、自動ころ挿入機を用いた円すいころ4a,4bの保持器20a,20bへの組み込み作業を容易に行うことができ、また、ポケット24の径方向外側の開口部24bの円周方向幅は、ポケットの径方向内側の開口部24aの円周方向幅よりも小さくしたので、内径側の柱部23の径方向幅を減らして、材料の節約、質量やコストの削減を図ることができる。 As described above, according to the method of manufacturing the hub unit bearing 1 of the present embodiment, the tapered rollers 4a and 4b deform the column portion 23 so that the pocket 24 is formed. Since the tapered rollers 4a and 4b are inserted through the radially outer opening 24b, the tapered rollers 4a and 4b can be easily assembled into the retainers 20a and 20b using an automatic roller inserter. Since the circumferential width of the outer opening 24b is made smaller than the circumferential width of the radially inner opening 24a of the pocket, the radial width of the inner diameter side post 23 is reduced to save material, It is possible to reduce the mass and cost.

また、本実施形態のハブニット軸受1によれば、外径側テーパ面25aの径方向長さDは、内径側テーパ面26aの径方向長さEより短く、径方向外側の開口部24bの円周方向幅Bは、径方向内側の開口部24aの円周方向幅Aよりも小さく、径方向外側の開口部24bの円周方向幅B、及び径方向内側の開口部24aの円周方向幅Aは、円すいころ4aの直径Cよりも小さいので、円すいころ4aの直径部分が径方向外側の開口部24bを乗り越えると直ぐに内径側テーパ面26aによって所定位置に保持されるので、外径側からの円すいころ4aの組み立て作業が容易になる。
また、ポケット24は、外径側テーパ面25aと内径側テーパ面26aとの間に屈曲点28を有することで、円すいころ4aと保持器20aとの接触面積が特許文献2の形状と比べて減少し、摩擦損失を減少することができるので、低トルク化を図ることができる。
Further, according to the hub knit bearing 1 of the present embodiment, the radial length D of the outer diameter side tapered surface 25a is shorter than the radial length E of the inner diameter side tapered surface 26a, and the radial length D of the radially outer opening 24b is smaller than the radial length E of the inner diameter side tapered surface 26a. The circumferential width B is smaller than the circumferential width A of the radially inner opening 24a and is equal to the circumferential width B of the radially outer opening 24b and the circumferential width of the radially inner opening 24a. Since A is smaller than the diameter C of the tapered roller 4a, as soon as the diameter portion of the tapered roller 4a gets over the radially outer opening 24b, it is held at a predetermined position by the inner diameter side tapered surface 26a. This facilitates the assembly work of the tapered rollers 4a.
In addition, since the pocket 24 has a bending point 28 between the outer diameter side tapered surface 25a and the inner diameter side tapered surface 26a, the contact area between the tapered rollers 4a and the cage 20a is larger than that of the shape of Patent Document 2. Since it is possible to reduce the friction loss, it is possible to achieve low torque.

図6は、本発明の変形例に係る保持器の一部を破断して示す部分側面図である。この変形例の保持器20cでは、小径円環部21の外周面から柱部23の小径円環部側の外周面にかけて面取り27が設けられている。この面取り27の軸方向寸法は、小径円環部21の厚さ(軸方向寸法)の2~3倍とし、ポケット24の径方向外側の開口部24bの途中まで設けられることが好ましい。 FIG. 6 is a partial side view showing a partially broken retainer according to a modification of the present invention. In the retainer 20c of this modified example, a chamfer 27 is provided from the outer peripheral surface of the small-diameter annular portion 21 to the outer peripheral surface of the column portion 23 on the small-diameter annular portion side. The axial dimension of this chamfer 27 is two to three times the thickness (axial dimension) of the small-diameter annular portion 21, and is preferably provided to the middle of the radially outer opening 24b of the pocket 24. As shown in FIG.

このような面取り27を設けることで、円すいころ4aを外径側から挿入するために柱部23を変形させた際の保持器20cのポケット24の隅R部(柱部23と小径円環部との繋ぎ目)の応力を緩和することができ、円すいころ4aを組み込む際の保持器20cの破損を防止できる。
なお、この面取り27は、柱部23の周方向変形を容易にするだけであり、全てのポケット24に円すいころ4aが挿入され、柱部23の変形がしにくい状態では、円すいころ4aの保持力の低下につながることはない。
By providing such a chamfer 27, when the column portion 23 is deformed to insert the tapered rollers 4a from the outer diameter side, the corner R portion of the pocket 24 of the retainer 20c (the column portion 23 and the small-diameter annular portion joints) can be relieved, and damage to the retainer 20c can be prevented when the tapered rollers 4a are incorporated.
The chamfering 27 only facilitates the circumferential deformation of the column portion 23. When the tapered rollers 4a are inserted into all the pockets 24 and the column portion 23 is difficult to deform, the tapered rollers 4a are held. It does not lead to any loss of power.

なお、本発明は上述した実施形態に限定されるものでなく、適宜、変形、改良などが可能である。
例えば、円すいころの脱落を防止するための脱落防止保持器の構造は、上記実施形態のものに限定されず、その機能を発揮できる限りにおいて、その他の構造を採用することができる。
また、外側密封部材及び内側密封部材の構造についても、上記実施形態のものに限定されず、従来から知られた各種構造の密封部材を採用することができる。
It should be noted that the present invention is not limited to the above-described embodiments, and modifications and improvements are possible as appropriate.
For example, the structure of the fall-off prevention cage for preventing the tapered rollers from falling off is not limited to that of the above embodiment, and other structures can be employed as long as the function can be exhibited.
Also, the structures of the outer sealing member and the inner sealing member are not limited to those of the above embodiment, and conventionally known various structures of sealing members can be employed.

1 ハブユニット軸受
2 外輪
3 ハブ
4a,4b 円すいころ
5 静止フランジ
6a,6b 外輪軌道
7 ハブ輪
8 内輪
9 回転フランジ
10a,10b 内輪軌道
11 嵌合軸部
12 パイロット部
14a,14b 大鍔部
15 段差面
16 かしめ部
17 空間
18 外側密封部材
19 内側密封部材
20a,20b 保持器
21 小径円環部
22 大径円環部
23 柱部
24 ポケット
24a 径方向内側の開口部
24b 径方向外側の開口部
25 爪部
25a 外径側テーパ面
26 柱部本体
26a 内径側テーパ面
1 hub unit bearing 2 outer ring 3 hub 4a, 4b tapered roller 5 stationary flange 6a, 6b outer ring raceway 7 hub ring 8 inner ring 9 rotating flange 10a, 10b inner ring raceway 11 fitting shaft portion 12 pilot portion 14a, 14b large flange portion 15 step Surface 16 Crimped portion 17 Space 18 Outer sealing member 19 Inner sealing member 20a, 20b Cage 21 Small diameter annular portion 22 Large diameter annular portion 23 Column 24 Pocket 24a Radially inner opening 24b Radially outer opening 25 Claw portion 25a Outer diameter side tapered surface 26 Column main body 26a Inner diameter side tapered surface

Claims (5)

内周面に外輪軌道を有する外輪と、
外周面に内輪軌道を有するハブと、
前記外輪軌道と前記内輪軌道との間に配置された複数の円すいころと、
前記円すいころを転動自在に保持する保持器と、を備え、
前記保持器は、前記円すいころを径方向に脱落不能に保持できるころ脱落防止保持器である、
ハブユニット軸受の組立方法であって、
前記保持器は、小径円環部と、前記小径円環部よりも大きな外径を有する大径円環部と、円周方向に関して等間隔に配置され、前記小径円環部と前記大径円環部とを軸方向に連結する複数の柱部とを備え、円周方向に隣り合う前記柱部同士の間部分を、前記円すいころを転動自在に保持するためのポケットとしたものであり、
前記ポケットの径方向内側の開口部は、前記円すいころの長手方向の少なくとも中間位置において、前記円すいころの自転軸よりも内径側に位置しており、その円周方向幅は、前記円すいころの直径よりも小さくなっており、
前記ポケットの径方向外側の開口部は、前記円すいころの長手方向の全域において、前記円すいころの自転軸よりも外径側に位置しており、その円周方向幅は、前記円すいころの直径よりも小さく、
前記ポケットの径方向外側の開口部の円周方向幅は、前記ポケットの径方向内側の開口部の円周方向幅よりも小さく、
前記円すいころは、前記柱部を変形させて、前記ポケットの径方向外側の開口部から挿入される、
ハブユニット軸受の組立方法。
an outer ring having an outer ring raceway on its inner peripheral surface;
a hub having an inner ring raceway on its outer peripheral surface;
a plurality of tapered rollers arranged between the outer ring raceway and the inner ring raceway;
a retainer that retains the tapered rollers in a rollable manner,
The retainer is a roller drop-off prevention retainer capable of retaining the tapered rollers in a radial direction so as not to fall off.
A method for assembling a hub unit bearing, comprising:
The retainer has a small-diameter ring portion and a large-diameter ring portion having an outer diameter larger than that of the small-diameter ring portion, and is arranged at equal intervals in a circumferential direction. and a plurality of pillars for axially connecting the annular portion, and pockets between the pillars adjacent in the circumferential direction are pockets for holding the tapered rollers so that they can roll freely. ,
The radially inner opening of the pocket is located on the inner diameter side of the rotation axis of the tapered roller at least at an intermediate position in the longitudinal direction of the tapered roller, and has a width in the circumferential direction of the tapered roller. is smaller than the diameter,
The radially outer opening of the pocket is located on the outer diameter side of the rotation axis of the tapered roller over the entire length of the tapered roller, and the width in the circumferential direction is equal to the diameter of the tapered roller. smaller than
the circumferential width of the radially outer opening of the pocket is less than the circumferential width of the radially inner opening of the pocket;
The tapered roller deforms the column portion and is inserted from the radially outer opening of the pocket.
A method of assembling a hub unit bearing.
前記円すいころの長手方向の中間位置において、前記ポケットの径方向内側の開口部の円周方向幅をA、前記ポケットの径方向外側の開口部の円周方向幅をB、前記円すいころの直径をC、とすると、
A/C=97~99%、B/C=93~97%とする、
請求項1に記載のハブユニット軸受の組立方法。
At an intermediate position in the longitudinal direction of the tapered roller, A is the circumferential width of the radially inner opening of the pocket, B is the circumferential width of the radially outer opening of the pocket, and the diameter of the tapered roller is is C, then
A / C = 97 to 99%, B / C = 93 to 97%,
The method for assembling the hub unit bearing according to claim 1.
前記柱部は、互いに略平行な平坦な円周方向両側面を有する柱部本体と、前記柱部本体の円周方向両側面の径方向外側から円周方向に向かって徐々に先細に突出して前記円すいころの長手方向に沿って延びる一対の爪部を有し、
前記ポケットの径方向内側の開口部の円周方向幅は、前記円周方向に隣り合う柱部の円周方向側面の内径側端部によって規定され、
前記ポケットの径方向外側の開口部の円周方向幅は、前記円周方向に隣り合う柱部の爪部の先端部によって規定される、
請求項1又は2に記載のハブユニット軸受の組立方法。
The column includes a column main body having flat circumferential side surfaces substantially parallel to each other, and protruding gradually taperingly in the circumferential direction from the radially outer sides of the circumferential both side surfaces of the column main body. Having a pair of claws extending along the longitudinal direction of the tapered roller,
the circumferential width of the radially inner opening of the pocket is defined by the inner diameter side end of the circumferential side surface of the circumferentially adjacent column;
The circumferential width of the radially outer opening of the pocket is defined by the tips of the claws of the pillars adjacent to each other in the circumferential direction,
3. The method for assembling the hub unit bearing according to claim 1 or 2.
前記保持器は、前記小径円環部の外周面から前記柱部の小径円環部側の外周面にかけて面取りが設けられている、
請求項1~3のいずれか1項に記載のハブユニット軸受の組立方法。
The retainer is chamfered from the outer peripheral surface of the small-diameter annular portion to the outer peripheral surface of the column portion on the side of the small-diameter annular portion.
A method for assembling a hub unit bearing according to any one of claims 1 to 3.
内周面に外輪軌道を有する外輪と、
外周面に内輪軌道を有するハブと、
前記外輪軌道と前記内輪軌道との間に配置された複数の円すいころと、
前記円すいころを転動自在に保持する保持器と、を備え、
前記保持器は、前記円すいころを径方向に脱落不能に保持できるころ脱落防止保持器である、ハブユニット軸受であって、
前記保持器は、小径円環部と、前記小径円環部よりも大きな外径を有する大径円環部と、円周方向に関して等間隔に配置され、前記小径円環部と前記大径円環部とを軸方向に連結する複数の柱部とを備え、円周方向に隣り合う前記柱部同士の間部分を、前記円すいころを転動自在に保持するためのポケットとしたものであり、
前記ポケットは、径方向外側の開口部と、外径側に向かうに従い互いの間隔が狭くなる方向に傾いた一対の外径側テーパ面と、前記外径側テーパ面の内径側端部と屈曲点を介して接続され、内径側に向かうに従い互いに間隔が狭くなる方向に傾いた一対の内径側テーパ面と、径方向内側の開口部と、を有して略六角形状に形成され、
前記外径側テーパ面の径方向長さは、前記内径側テーパ面の径方向長さより短く、
前記径方向外側の開口部の円周方向幅は、前記径方向内側の開口部の円周方向幅よりも小さく、
前記径方向外側の開口部の円周方向幅、及び前記径方向内側の開口部の円周方向幅は、前記円すいころの直径よりも小さい、
ハブユニット軸受。
an outer ring having an outer ring raceway on its inner peripheral surface;
a hub having an inner ring raceway on its outer peripheral surface;
a plurality of tapered rollers arranged between the outer ring raceway and the inner ring raceway;
a retainer that retains the tapered rollers in a rollable manner,
The retainer is a roller drop-off prevention retainer capable of retaining the tapered rollers in a radial direction so that the tapered rollers cannot fall off.
The retainer has a small-diameter ring portion and a large-diameter ring portion having an outer diameter larger than that of the small-diameter ring portion, and is arranged at equal intervals in a circumferential direction. and a plurality of pillars for axially connecting the annular portion, and pockets between the pillars adjacent in the circumferential direction are pockets for holding the tapered rollers so that they can roll freely. ,
The pocket includes an opening on the outside in the radial direction, a pair of outer diameter side tapered surfaces inclined in a direction in which the distance between them narrows toward the outer diameter side, an inner diameter side end portion of the outer diameter side tapered surface, and a bent portion. It is formed in a substantially hexagonal shape having a pair of inner diameter side tapered surfaces connected via a point and inclined in a direction in which the distance between them becomes narrower toward the inner diameter side, and an opening portion on the inner side in the radial direction,
the radial length of the outer diameter tapered surface is shorter than the radial length of the inner diameter tapered surface,
the circumferential width of the radially outer opening is smaller than the circumferential width of the radially inner opening;
the circumferential width of the radially outer opening and the circumferential width of the radially inner opening are smaller than the diameter of the tapered roller;
hub unit bearings.
JP2021205435A 2021-12-17 2021-12-17 Method for assembling hub unit bearing, and hub unit bearing Pending JP2023090469A (en)

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