JP4692879B2

JP4692879B2 - Hub unit

Info

Publication number: JP4692879B2
Application number: JP2005213465A
Authority: JP
Inventors: 有宏藤原
Original assignee: JTEKT Corp
Current assignee: JTEKT Corp
Priority date: 2005-07-22
Filing date: 2005-07-22
Publication date: 2011-06-01
Anticipated expiration: 2025-07-22
Also published as: JP2007030572A

Description

本発明は、ハブユニットに関するものである。 The present invention relates to a hub unit.

特開２００１−３１５５０３号公報JP 2001-315503 A

従来から自動車には、タイヤホイールやブレーキディスクを取り付けるためのハブユニットが用いられている。このハブユニットは、車軸に一体回転可能に設けられ、タイヤホイールやブレーキディスクを固定するハブ本体と、そのハブ本体のラジアル方向外側に転動体を介して非回転に配置される外輪と、転動体の両側に配置された防水・防塵用のシール部とを含むものである。ハブユニットを自動車側に取り付ける構造として、例えば特許文献１には、自動車側に設けられたナックル（車両側組付部材）に対して外輪を内嵌させる構造が開示されている。 Conventionally, a hub unit for attaching a tire wheel and a brake disk is used in an automobile. The hub unit is provided so as to be rotatable integrally with the axle, and fixes a tire wheel and a brake disk, an outer ring disposed non-rotatingly via a rolling element on a radially outer side of the hub body, and a rolling element. And a waterproof / dustproof seal portion disposed on both sides of the battery. As a structure for attaching the hub unit to the automobile side, for example, Patent Document 1 discloses a structure in which an outer ring is fitted into a knuckle (vehicle side assembly member) provided on the automobile side.

上記構造では、車両アウタ側は閉じられているため水等の浸入があまり無いが、車両インナ側は開放しているため、その開放側から車軸とナックル（または外輪）の隙間へ水が入り込み、しかもその水が簡単に外部へ抜けないという問題がある。そのため、水がシール部を通して転動体側へ入り込み、転動体が錆びやすくなるという問題があった。 In the above structure, since the vehicle outer side is closed, there is not much intrusion of water etc., but since the vehicle inner side is open, water enters the gap between the axle and the knuckle (or outer ring) from the open side, Moreover, there is a problem that the water cannot easily escape to the outside. Therefore, there is a problem that water enters the rolling element side through the seal portion, and the rolling element is easily rusted.

本発明は上述のような事情を背景になされたもので、特に、車両インナ側から入り込んだ水を外部へ排出しやすいハブユニットを提供することを課題とする。 The present invention has been made in the background as described above. In particular, it is an object of the present invention to provide a hub unit that easily discharges water entering from the vehicle inner side to the outside.

Means for Solving the Problems and Effects of the Invention

本発明は、
車軸の外周面に一体回転可能に取り付けられ、自身の外周面の車両アウタ側の端部からラジアル方向外向きに突出形成された車輪取付部を有するハブ本体と、
そのハブ本体の外周面に取り付けられる軸受部であって、前記車軸および前記ハブ本体と一体回転する内輪と、その内輪のラジアル方向外側に、非回転に配置された外輪と、前記内輪と前記外輪との間に配置され、前記内輪を前記外輪に対して回転自在に支持する転動体と、転動体配置用の環状の空間のアキシアル方向における車両インナ側端部にて、前記内輪と前記外輪との間を、それら内輪と外輪との相対回転を許容した状態でシールするシール部とを有する軸受部と、
を備え、前記外輪は、車両インナ側の端部にて車両側に設けられた車両側組付部材の開口部に対し、内側から嵌合することにより車両に組み付けられ、
前記外輪の前記車両側組付部材に嵌合する前記車両インナ側の端部には、前記シール部よりも車両インナ側の位置において該端部の内周面に開口する排水孔が、当該端部をラジアル方向に貫通する形態で形成されてなることを特徴とするハブユニットである。 The present invention
A hub main body having a wheel mounting portion that is attached to the outer peripheral surface of the axle so as to be integrally rotatable, and that protrudes radially outward from an end of the outer peripheral surface of the vehicle outer side;
A bearing portion attached to the outer peripheral surface of the hub main body, the inner ring rotating integrally with the axle and the hub main body, the outer ring disposed non-rotatingly on the radially outer side of the inner ring, the inner ring and the outer ring Between the inner ring and the outer ring at a vehicle inner side end portion in the axial direction of the annular space for the rolling element arrangement, and a rolling element that rotatably supports the inner ring with respect to the outer ring. A bearing portion having a seal portion that seals between the inner ring and the outer ring in a state in which relative rotation between the inner ring and the outer ring is allowed.
The outer ring is assembled to the vehicle by fitting from the inside to the opening of the vehicle side assembly member provided on the vehicle side at the end on the vehicle inner side,
A drain hole that opens to an inner peripheral surface of the end portion at a position closer to the vehicle inner side than the seal portion is provided at the end portion of the outer ring that is fitted to the vehicle-side assembly member. The hub unit is characterized in that it is formed in a form that penetrates the portion in the radial direction.

上記本発明によると、外輪の車両インナ側の端部には、シール部よりも車両インナ側の位置において、端部内周面に開口する排水孔が、端部をラジアル方向に貫通する形態で形成されている。この排水孔は、車両組付け状態において下向きとなるようにされている。そのため、車両インナ側から水等が入ってきたとしても、排水孔を通して自然に水が排出されるので、外輪の内部に水が溜まりにくくなる。従って、シール部から水が浸入しにくくなり、転動体の錆進行を防止できる。 According to the present invention, the end of the outer ring on the vehicle inner side is formed with a drain hole that opens to the inner peripheral surface of the end at a position closer to the vehicle inner side than the seal portion in a form that penetrates the end in the radial direction. Has been. This drain hole is made to face downward when the vehicle is assembled. Therefore, even if water or the like enters from the vehicle inner side, the water is naturally discharged through the drain hole, so that it is difficult for water to collect inside the outer ring. Therefore, it becomes difficult for water to enter from the seal portion, and the rusting of the rolling elements can be prevented.

より詳しくは、前記車両側組付部材は両端が開口した筒状に形成され、車両組付状態において、その車両アウタ側の開口部に前記外輪が内嵌し、前記車両側組付部材の内周面と前記車軸の外周面との間に車両インナ側の端部が開口したインナ側開放空間を形成するように、前記車両側組付部材が位置している。すなわち、例えば従動輪側では、車軸を短く構成して、車両側組付部材の車両インナ側端部を閉じた形状にすることも可能であるが、この場合は車両インナ側から水が浸入することは無い。つまり、本発明による排水孔は、上述のように車両側組付部材の車両インナ側の端部が開口する場合に、特に効果を奏するものである。 More specifically, the vehicle-side assembly member is formed in a cylindrical shape having both ends opened. In the vehicle assembly state, the outer ring is fitted into the opening on the vehicle outer side, and the vehicle-side assembly member The vehicle-side assembly member is positioned so as to form an inner-side open space in which an end on the vehicle inner side is opened between the peripheral surface and the outer peripheral surface of the axle. That is, for example, on the driven wheel side, the axle can be configured to be short and the vehicle inner side end of the vehicle side assembly member can be closed. In this case, water enters from the vehicle inner side. There is nothing. That is, the drainage hole according to the present invention is particularly effective when the end on the vehicle inner side of the vehicle side assembly member opens as described above.

一方、ラジアル方向に貫通孔を形成し、その貫通孔だけによって排水孔を構成すると、車両側組付部材によって塞がれない位置に排水孔を形成する必要がある。そのため、最適な位置（シール部のすぐ内側）に開口させることができない場合がある。このような問題は、以下の構成を採用することで解決できる。すなわち、
車両組付状態において前記排水孔は、前記外輪の内部空間側に開口した内側開口部が、前記車両側組付部材と重なる位置に開口し、外部空間側に開口した外側開口部が、前記車両側組付部材に対しアキシアル方向において車両アウタ側に外れた位置に開口してなるハブユニット。 On the other hand, when a through hole is formed in the radial direction and the drain hole is formed only by the through hole, the drain hole needs to be formed at a position that is not blocked by the vehicle side assembly member. For this reason, it may not be possible to open at the optimum position (immediately inside the seal portion). Such a problem can be solved by adopting the following configuration. That is,
In the vehicle assembly state, the drain hole has an inner opening that opens on the inner space side of the outer ring, opens at a position overlapping the vehicle assembly member, and an outer opening that opens on the outer space side A hub unit that opens to a position that is disengaged toward the vehicle outer side in the axial direction relative to the side assembly member.

上記ハブユニットは、より詳しくは以下の構造とされている。すなわち、
前記外輪は、
前記転動体に当接する外輪本体と、
その外輪本体の外周面からラジアル方向外向きに突出し、前記車両組付状態において前記車両側組付部材の車両アウタ側端部が当接するフランジ部と、
そのフランジ部の車両インナ側主表面からアキシアル方向内向きに突出し、前記車両組付状態において前記車両側組付部材に内嵌する、前記車両インナ側の端部をなすインロー部とを有し、
前記排水孔は、
前記インロー部に、前記車両組付状態においてラジアル方向に貫通形成された貫通孔と、
前記インロー部の外周面にアキシアル方向に形成され、前記フランジ部の車両インナ側主表面に至るアキシアル溝と、
該フランジ部の前記車両インナ側主表面においてラジアル方向に形成され、ラジアル方向内側の端部が前記アキシアル溝に連通し、ラジアル方向外側の端部が前記フランジ部の外周面に開放するラジアル溝とを有するハブユニット。 More specifically, the hub unit has the following structure. That is,
The outer ring is
An outer ring main body in contact with the rolling element;
A flange portion projecting radially outward from an outer peripheral surface of the outer ring main body, and in contact with a vehicle outer side end portion of the vehicle side assembly member in the vehicle assembly state;
An inlay portion that protrudes inward in the axial direction from the vehicle inner side main surface of the flange portion and fits into the vehicle side assembly member in the vehicle assembly state, and forms an end on the vehicle inner side;
The drain hole is
A through hole formed through the inlay portion in a radial direction in the vehicle assembled state;
An axial groove formed in the axial direction on the outer circumferential surface of the inlay portion and reaching the vehicle inner side main surface of the flange portion;
A radial groove formed in a radial direction on the vehicle inner side main surface of the flange portion, an end portion on the inner side in the radial direction communicating with the axial groove, and an end portion on the outer side in the radial direction open to an outer peripheral surface of the flange portion Hub unit with.

上記本発明によると、貫通孔と、アキシアル溝と、ラジアル溝とによって排水孔を構成しているので、外輪の端部で、車両側組付部材と重なる位置に貫通孔を形成したとしても、車両側組付部材に対し車両アウタ側に外れた位置に外側開口部を形成することができる。 According to the present invention, since the drain hole is constituted by the through hole, the axial groove, and the radial groove, even if the through hole is formed at a position overlapping the vehicle side assembly member at the end of the outer ring, The outer opening can be formed at a position away from the vehicle outer side with respect to the vehicle side assembly member.

また、前記外輪のうち、前記排水孔よりも車両インナ側に位置する部分には、その内周面が車両インナ側に拡径する形で、排水用の第一傾斜面が形成されている構成としてもよい。これにより、水を車両インナ側へ自然流下させることができ、シール部への水の浸入防止効率を上げることができる。 In addition, the first inclined surface for drainage is formed in a portion of the outer ring that is located closer to the vehicle inner side than the drainage hole so that the inner peripheral surface of the outer ring expands toward the vehicle inner side. It is good. As a result, water can be allowed to flow naturally toward the vehicle inner side, and the efficiency of preventing water from entering the seal portion can be increased.

さらに、前記外輪のうち、前記シール部と前記排水孔との間に位置する部分には、その内周面が前記排水孔側に拡径する形で、排水用の第二傾斜面が形成されている構成としてもよい。これにより、車両インナ側から入り込んだ水を自然に流下させ、排水孔から排出することができ、シール部への水の浸入防止効率が上げることができる。 Further, a second inclined surface for drainage is formed in a portion of the outer ring located between the seal portion and the drainage hole so that an inner peripheral surface thereof is expanded toward the drainage hole. It is good also as composition which has. Thereby, the water that has entered from the vehicle inner side can be allowed to flow down naturally and be discharged from the drainage hole, and the efficiency of preventing water from entering the seal portion can be increased.

また、前記外輪よりも車両インナ側に、前記車両側組付部材と前記車軸とのラジアル方向の間隙を部分的に塞ぐ形で、回転検出用のセンサを設けてもよい。つまり、ハブユニットには、回転検出用のセンサ（パルサリングなど）が取り付けられ、これによって検出された回転数をＡＢＳの制御等に利用するのであるが、このセンサによって車両側組付部材と車軸のラジアル方向の間隙が部分的に狭くされることがある。このような構造では、入り込んだ水が車両インナ側へ流下しにくくなる。そのため、本発明のように排水孔を設けると、その効果が一層顕著に現れる。 In addition, a rotation detection sensor may be provided on the vehicle inner side of the outer ring so as to partially close a radial gap between the vehicle-side assembly member and the axle. In other words, a rotation detection sensor (such as a pulsar ring) is attached to the hub unit, and the number of rotations detected by this sensor is used for ABS control. The radial gap may be partially narrowed. In such a structure, it is difficult for water that has entered to flow down to the vehicle inner side. Therefore, when the drain hole is provided as in the present invention, the effect becomes more prominent.

一方、前記車軸の外周面は、車両インナ側に段階的に拡径する形状にされ、前記取付部材の内周面は前記車軸の外周面形状に対応して車両インナ側に段階的に拡径する形状にされている。このような形状にした場合は、車両インナ側から入り込んだ水が排出されにくい。そのため、本発明のように排水孔を設けると、その効果が特に顕著に現れる。 On the other hand, the outer peripheral surface of the axle has a shape that gradually increases in diameter toward the vehicle inner side, and the inner peripheral surface of the mounting member gradually increases in diameter toward the vehicle inner side corresponding to the outer peripheral surface shape of the axle. It is in the shape to be. In the case of such a shape, it is difficult for water entering from the vehicle inner side to be discharged. Therefore, when the drain hole is provided as in the present invention, the effect is particularly remarkable.

以下、本発明の実施の形態を、図面を参照して説明する。
図１は本発明に係るハブユニット１の一例を断面構造にて示すものである。このハブユニット１は、車軸２の先端部外周面に取り付けられる筒状のハブ本体３ａと、そのハブ本体３ａの外周面からラジアル方向外向きに突出する車輪取付部３ｂと、ハブ本体３ａの外周面に取り付けられる軸受部４とを備える。軸受部４は、車軸２と一体回転可能に取り付けられる内輪４ａと、その内輪４ａのラジアル方向外側に非回転に配置された外輪４ｂと、内輪４ａと外輪４ｂとの間に配置され、内倫４ａを外輪４ｂに対して回転自在に支持する転動体４ｃと、シール部４ｅ，４ｆとを含む。シール部４ｅ，４ｆは、転動体４ｃ配置用の環状の空間のアキシアル方向における車両アウタ側端部または車両インナ側端部にて、内輪４ａと外輪４ｂとの間を、それら内輪４ａと外輪４ｂの相対回転を許容した状態でシールしている。また、外輪４ｂは、車両インナ側の端部にて車両側組付部材５（ナックル）の開口部に対し、内側から嵌合することにより車両に組みつけられている。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an example of a hub unit 1 according to the present invention in a sectional structure. The hub unit 1 includes a cylindrical hub body 3a attached to the outer peripheral surface of the front end portion of the axle 2, a wheel mounting portion 3b projecting radially outward from the outer peripheral surface of the hub main body 3a, and an outer periphery of the hub main body 3a. And a bearing portion 4 attached to the surface. The bearing portion 4 is disposed between an inner ring 4a attached to the axle 2 so as to be integrally rotatable, an outer ring 4b non-rotatably arranged radially outward of the inner ring 4a, and the inner ring 4a and the outer ring 4b. A rolling element 4c that rotatably supports 4a with respect to the outer ring 4b, and seal portions 4e and 4f are included. The seal portions 4e and 4f are disposed between the inner ring 4a and the outer ring 4b at the vehicle outer side end or the vehicle inner side end in the axial direction of the annular space for disposing the rolling elements 4c. It is sealed in a state that allows relative rotation. The outer ring 4b is assembled to the vehicle by fitting from the inside to the opening of the vehicle side assembly member 5 (knuckle) at the end on the vehicle inner side.

車軸先端部２ｔは、その後端側に隣接する車軸本体部２ｍよりも縮径されてなり、ハブ本体３ａが車軸先端部２ｔに外挿される。車軸先端部２ｔと車軸本体部２ｍとの境界位置には、ハブ本体３ａの後端面と当接する段部２ａが形成されている。 The axle tip portion 2t has a diameter smaller than that of the axle body portion 2m adjacent to the rear end side, and the hub body 3a is extrapolated to the axle tip portion 2t. A stepped portion 2a that contacts the rear end surface of the hub main body 3a is formed at the boundary position between the axle front end 2t and the axle main body 2m.

軸受部４は複列外向きアンギュラ玉軸受からなり、ハブ本体３ａの外周に、アキシアル方向に隣接する形で圧入外嵌される２つの単列用の内輪４ａと、二列の軌道溝を有する単一の外輪４ｂと、二列で配列される複数の玉（転動体）４ｃと、二つの冠形保持器４ｄ，４ｄとを備えている。軸受部４は、外輪４ｂを非回転として内輪４ａを回転させる形態で利用される。また、車輪取付部３ｂは、ハブ本体３ａの外周面から外向きに突出するフランジ状に形成され、車輪取付部９の車両アウタ側主表面から突出するボルト８により、ブレーキディスク９及びタイヤホイール（図示しない）が取り付けられる。 The bearing portion 4 is composed of a double-row outward angular ball bearing, and has two single-row inner rings 4a that are press-fitted and fitted in the form adjacent to the axial direction on the outer periphery of the hub body 3a, and two rows of raceway grooves. A single outer ring 4b, a plurality of balls (rolling elements) 4c arranged in two rows, and two crown-shaped cages 4d and 4d are provided. The bearing 4 is used in a form in which the outer ring 4b is not rotated and the inner ring 4a is rotated. The wheel mounting portion 3b is formed in a flange shape projecting outward from the outer peripheral surface of the hub body 3a, and the brake disc 9 and the tire wheel (with the bolt 8 projecting from the vehicle outer side main surface of the wheel mounting portion 9) (Not shown) is attached.

ハブ本体３ａの外周面には、車両アウタ側の内輪４ａに当接する段部３ｃと、車両インナ側の内輪４ａに当接する段部３ｄとが形成されている。また、車軸本体２ｍには、車両インナ側の内輪４ａに当接する段部２ｂが形成されている。一方、ハブ本体３ａに挿入された車軸２の先端部には、車輪取付部３ｂよりも車両アウタ側に突出した雄ねじ部が形成され、ここに、ハブ本体３ａを車軸２に締結するためのハブ締結ナット２ｖが螺合している。 On the outer peripheral surface of the hub body 3a, a step portion 3c that contacts the inner ring 4a on the vehicle outer side and a step portion 3d that contacts the inner ring 4a on the vehicle inner side are formed. Further, the axle main body 2m is formed with a step portion 2b that contacts the inner ring 4a on the vehicle inner side. On the other hand, a male thread portion protruding toward the vehicle outer side from the wheel mounting portion 3b is formed at the tip end portion of the axle shaft 2 inserted into the hub body 3a, and a hub for fastening the hub body 3a to the axle shaft 2 is formed here. The fastening nut 2v is screwed.

車両側組付部材５は両端が開口した筒状に形成され、車両組付状態において、その車両アウタ側の開口部に外輪４ｂが内嵌し、車両側組付部材５の内周面と車軸本体２ｍの外周面との間に車両インナ側の端部が開口したインナ側開放空間Ｓを形成するように、車両側組付部材５が位置している。車両走行時には、タイヤの回転によって雨水等が巻き上がり、車両側組付部材５の車両インナ側開口部からその雨水がインナ側開放空間Ｓに浸入しやすくなる。その結果、シール部４ｆを通して水が転動体４ｃ側へ入り、転動体４ｃが錆びやすくなるという問題があったが、本発明ではシール部４ｆより内側において外輪４ｂに排水孔６を設けたので、水を外部に排出することができ、上記問題を解決することができた。より詳しくは、この排水孔６は、車両側組付部材５と嵌合する外輪４ｂの端部に形成され、シール部４ｆよりも車両インナ側の位置において該端部の内周面に開口し、当該端部をラジアル方向に貫通する形態にされている。 The vehicle-side assembly member 5 is formed in a cylindrical shape with both ends opened. In the vehicle assembly state, the outer ring 4b is fitted into the opening on the vehicle outer side, and the inner peripheral surface of the vehicle-side assembly member 5 and the axle The vehicle-side assembly member 5 is positioned so as to form an inner-side open space S in which an end on the vehicle inner side is opened between the outer peripheral surface of the main body 2m. When the vehicle travels, rainwater or the like rolls up due to the rotation of the tire, and the rainwater easily enters the inner side open space S from the vehicle inner side opening of the vehicle side assembly member 5. As a result, there was a problem that water entered the rolling element 4c side through the seal part 4f, and the rolling element 4c was likely to rust, but in the present invention, the drain hole 6 was provided in the outer ring 4b inside the seal part 4f. Water could be discharged to the outside, and the above problem could be solved. More specifically, the drain hole 6 is formed at an end portion of the outer ring 4b fitted to the vehicle-side assembly member 5, and opens to the inner peripheral surface of the end portion at a position closer to the vehicle inner side than the seal portion 4f. The end is penetrated in the radial direction.

図１に示すように、外輪４ｂに嵌合する車両側組立部材５の車両アウタ側端部を、シール部４ｆよりもアキシアル方向において略同位置か、または外側に位置させることができる。これにより、車両側組付部５が外輪４ｂに対して圧入外嵌する長さを十分に確保でき、しっかりと外輪４ｂを固定できる。このような構造においては、以下のように排水孔６を形成するとよい。すなわち、外輪４ｂの内部空間側に開口した内側開口部６ｄが、ラジアル方向において車両側組付部材５と重なる位置に開口し、外部空間側に開口した外側開口部６ｅが、車両側組付部材５に対しアキシアル方向において車両アウタ側に外れた位置に開口するのである。これにより、内側開口部６ｄを最適な位置（シール部４ｆのすぐ内側）に形成でき、かつ、車両側組付部材５によって排水経路が塞がれないようにすることができる。この排水孔６は、より詳しくは、外輪４ｂの車両インナ側端部に形成された貫通孔６ａと、後述するアキシアル溝６ｂ、ラジアル溝６ｃによって構成されている。すなわち、仮に図４Ａに示すように、貫通孔６ａだけを使って排水孔６を構成しようとすると、車両側組立部材５によって貫通孔６ａが塞がれてしまう。設計上の制約により、車両側組立部材５に貫通孔（排水孔）を形成できない場合が多く、そのため、排水できなくなってしまう。また、仮に図４Ｂに示すように、車両側組立部材５を迂回しようとすると、シール部４ｆの車両インナ側に内側開口部６ｅが位置せず、本発明の効果を得られなくなる。 As shown in FIG. 1, the vehicle outer side end portion of the vehicle side assembly member 5 fitted to the outer ring 4 b can be placed substantially at the same position or positioned outside the seal portion 4 f in the axial direction. Thereby, the length by which the vehicle side assembly | attachment part 5 press-fits with respect to the outer ring 4b can fully be ensured, and the outer ring 4b can be fixed firmly. In such a structure, the drain hole 6 may be formed as follows. That is, the inner opening 6d that opens to the inner space side of the outer ring 4b opens at a position that overlaps the vehicle-side assembly member 5 in the radial direction, and the outer opening 6e that opens to the outer space side has a vehicle-side assembly member. With respect to 5, it opens to the position which deviated to the vehicle outer side in the axial direction. Accordingly, the inner opening 6d can be formed at an optimal position (immediately inside the seal portion 4f), and the drainage path can be prevented from being blocked by the vehicle-side assembly member 5. More specifically, the drain hole 6 is configured by a through hole 6a formed at the vehicle inner side end of the outer ring 4b, an axial groove 6b, and a radial groove 6c described later. That is, as shown in FIG. 4A, if the drain hole 6 is configured using only the through hole 6a, the through hole 6a is blocked by the vehicle side assembly member 5. Due to design restrictions, there are many cases where a through hole (drainage hole) cannot be formed in the vehicle-side assembly member 5, so that drainage cannot be performed. As shown in FIG. 4B, if the vehicle side assembly member 5 is to be bypassed, the inner opening 6e is not positioned on the vehicle inner side of the seal portion 4f, and the effect of the present invention cannot be obtained.

次に、本発明の構成をより詳細に説明する。まず、外輪４ｂの構造であるが、図１の断面図および図２の概略斜視図に示すように、外輪本体４ｂの外周面からラジアル方向外向きにフランジ部４ｈが突出形成され、車両側組付部材５の車両アウタ側端部が当接している。また、フランジ部４ｈの車両インナ側主表面からはインロー部４ｇがアキシアル方向内向きに突出し、車両側組付部材５に内嵌している。一方、排水孔６は、貫通孔６ａと、アキシアル溝６ｂと、ラジアル溝６ｃとからなる。貫通孔６ａはインロー部４ｇに、ラジアル方向に貫通形成されており、アキシアル溝６ｂは、インロー部４ｇの外周面にアキシアル方向に形成され、車両インナ側の端部が貫通孔６ａに連通し、車両アウタ側の端部がフランジ部４ｈの車両インナ側主表面に至るようにされている。そしてラジアル溝６ｃは、フランジ部４ｈの車両インナ側主表面においてラジアル方向に形成されており、ラジアル方向内側の端部がアキシアル溝６ｂに連通し、ラジアル方向外側の端部がフランジ部４ｈの外周面に解放するようにされている。ハブユニット１は、貫通孔６ａおよびラジアル溝６ｃが下向きになるように車両に取り付けられる。このような構造にすることで、車両側組付部材５を、その車両アウタ側端部がシール部４ｆよりも車両アウタ側に位置するまで圧入外嵌して、外輪をしっかりと固定できるとともに、シール部４ｆの車両インナ側に内側開口部６ｄを形成し、かつ、車両側組付部材５を迂回するように排水孔６を形成することができる。 Next, the configuration of the present invention will be described in more detail. First, regarding the structure of the outer ring 4b, as shown in the cross-sectional view of FIG. 1 and the schematic perspective view of FIG. 2, a flange portion 4h protrudes radially outward from the outer peripheral surface of the outer ring main body 4b. The vehicle outer side end of the attachment member 5 is in contact. In addition, an inlay portion 4 g protrudes inward in the axial direction from the vehicle inner side main surface of the flange portion 4 h and is fitted into the vehicle side assembly member 5. On the other hand, the drain hole 6 includes a through hole 6a, an axial groove 6b, and a radial groove 6c. The through hole 6a is formed through the inlay portion 4g in the radial direction, the axial groove 6b is formed in the axial direction on the outer peripheral surface of the inlay portion 4g, and the end on the vehicle inner side communicates with the through hole 6a. The end portion on the vehicle outer side reaches the vehicle inner side main surface of the flange portion 4h. The radial groove 6c is formed in the radial direction on the vehicle inner side main surface of the flange portion 4h, the radially inner end communicates with the axial groove 6b, and the radially outer end is the outer periphery of the flange portion 4h. To be released to the surface. The hub unit 1 is attached to the vehicle so that the through hole 6a and the radial groove 6c face downward. By adopting such a structure, the vehicle-side assembly member 5 can be press-fitted and fitted until the vehicle outer side end is located on the vehicle outer side with respect to the seal portion 4f, and the outer ring can be firmly fixed, The inner opening 6d can be formed on the vehicle inner side of the seal portion 4f, and the drain hole 6 can be formed so as to bypass the vehicle-side assembly member 5.

一方、車軸本体２ｍの外周面には、車両インナ側に向かって段階的に拡径する段部２ｃ〜２ｅが形成されている。また、車両側組付部材５の内周面には、車軸本体２ｍの外周面形状に対応して車両インナ側に段階的に拡径する段部５ａ，５ｂが形成されている。このような形状では、インナ側開放空間Ｓに入り込んだ水が玉状になった場合に、容易に排出されないことがある。そのため、排水孔６を形成するとその効果が特に顕著に現れる。 On the other hand, on the outer peripheral surface of the axle main body 2m, step portions 2c to 2e are formed which gradually increase in diameter toward the vehicle inner side. Further, on the inner peripheral surface of the vehicle-side assembly member 5, step portions 5 a and 5 b are formed which gradually increase in diameter toward the vehicle inner side corresponding to the outer peripheral surface shape of the axle body 2 m. In such a shape, when the water which entered the inner side open space S becomes a ball shape, it may not be easily discharged. Therefore, when the drain hole 6 is formed, the effect is particularly noticeable.

また、車軸本体２ｍの外周面には、回転数検出用のセンサ７（パルサリング）を設けてある。このセンサ７によって車軸本体２ｍと車両側組付部材５のラジアル方向の間隙が局所的に狭くなってしまうため、一旦インナ側開放空間Ｓに入り込んだ水が排出されにくくなる。そのため、排水孔６を設けるとその効果が一層顕著に現れる。 A sensor 7 (pulsar ring) for detecting the rotational speed is provided on the outer peripheral surface of the axle body 2m. Since the radial gap between the axle main body 2m and the vehicle-side assembly member 5 is locally narrowed by the sensor 7, the water once entering the inner-side open space S is hardly discharged. Therefore, when the drain hole 6 is provided, the effect appears more remarkably.

次に、本発明の別の実施形態を図３に示す。この実施形態では、外輪４ｂのうち、排水孔６よりも車両インナ側に位置する部分に、その内周面が車両インナ側に拡径する形で、排水用の第一傾斜面１０を形成してある。この第一傾斜面１０によって、インナ側開放空間Ｓに入った水を車両インナ側へ流下させて排出することができる。この第一傾斜面１０は、外輪４ｂの内周面を一周するように形成するよりも、排水孔６の近傍だけに形成する方が好ましい。外輪４ｂの内周面を一周するように形成した場合は、外輪４ｂの厚さが薄くなるので強度が低下する場合があり、また、実際に水が流下するのは外輪４ｂの下部だけなので、排水孔６の近傍だけに第一傾斜面１０を形成する方がよい。 Next, another embodiment of the present invention is shown in FIG. In this embodiment, the first inclined surface 10 for drainage is formed in a portion of the outer ring 4b that is located closer to the vehicle inner side than the drainage hole 6 so that the inner peripheral surface of the outer ring 4b expands toward the vehicle inner side. It is. By this first inclined surface 10, the water that has entered the inner side open space S can flow down to the vehicle inner side and be discharged. The first inclined surface 10 is preferably formed only in the vicinity of the drainage hole 6 rather than being formed so as to make one round of the inner peripheral surface of the outer ring 4b. If the outer ring 4b is formed so as to go around the inner circumferential surface, the thickness of the outer ring 4b may be reduced, so that the strength may decrease. In addition, water actually flows down only at the lower part of the outer ring 4b. It is better to form the first inclined surface 10 only in the vicinity of the drain hole 6.

また、外輪４ｂのうち、シール部材４ｆと排水孔６との間に位置する部分には、その内周面が排水孔６の内側開口部６ｄ側に拡径する形で、排水用の第二傾斜面１１が形成されている。したがって、シール部４ｆのすぐ内側にまで水が侵入してきても、この第二傾斜面１１によって、水を内側開口部６ｄまで流下させることができる。そのため、シール部４ｆの内側を常に乾いた状態に維持できる。第二傾斜面１１も、第一傾斜面１０と同じ理由により、排水孔６の近傍にだけ形成することが好ましい。 Further, in the portion of the outer ring 4b located between the seal member 4f and the drain hole 6, the inner peripheral surface of the outer ring 4b expands toward the inner opening 6d side of the drain hole 6, so that the second drain An inclined surface 11 is formed. Therefore, even if water enters just inside the seal portion 4f, the second inclined surface 11 allows the water to flow down to the inner opening 6d. Therefore, the inside of the seal part 4f can always be kept dry. The second inclined surface 11 is also preferably formed only in the vicinity of the drain hole 6 for the same reason as the first inclined surface 10.

本発明に係るハブユニットの一実施形態を示す断面図。Sectional drawing which shows one Embodiment of the hub unit which concerns on this invention. 外輪４ｂの斜視図。The perspective view of the outer ring | wheel 4b. 第一傾斜面１０および第二傾斜面１１を形成した実施形態。The embodiment in which the first inclined surface 10 and the second inclined surface 11 are formed. 仮に、貫通孔６ａだけで排水孔を構成した場合の状態を示す図。The figure which shows the state at the time of comprising a drain hole only by the through-hole 6a.

Explanation of symbols

１ハブユニット
２車軸
２ｍ車軸本体
２ｔ車軸先端部
３ハブ
３ａハブ本体
３ｂ車輪取付部
４軸受部
４ａ内輪
４ｂ外輪
４ｃ転動体
４ｆシール部
４ｇインロー部
４ｈフランジ部
５車両側組付部材
６排水孔
６ａ貫通孔
６ｂアキシアル溝
６ｃラジアル溝
６ｄ内側開口部
６ｅ外側開口部
７センサ DESCRIPTION OF SYMBOLS 1 Hub unit 2 Axle 2m Axle main body 2t Axle tip part 3 Hub 3a Hub main body 3b Wheel mounting part 4 Bearing part 4a Inner ring 4b Outer ring 4c Rolling body 4f Seal part 4g Inlay part 4h Flange part 5 Vehicle side assembly member 6 Drain hole 6a Through hole 6b Axial groove 6c Radial groove 6d Inner opening 6e Outer opening 7 Sensor

Claims

A hub main body having a wheel mounting portion that is attached to the outer peripheral surface of the axle so as to be integrally rotatable, and that protrudes radially outward from an end of the outer peripheral surface of the vehicle outer side;
A bearing portion attached to the outer peripheral surface of the hub main body, the inner ring rotating integrally with the axle and the hub main body, the outer ring disposed non-rotatingly on the radially outer side of the inner ring, the inner ring and the outer ring Between the inner ring and the outer ring at a vehicle inner side end portion in the axial direction of the annular space for the rolling element arrangement, and a rolling element that rotatably supports the inner ring with respect to the outer ring. A bearing portion having a seal portion that seals between the inner ring and the outer ring in a state that allows relative rotation between the
The outer ring is assembled to the vehicle by fitting from the inside to the opening of the vehicle side assembly member provided on the vehicle side at the end on the vehicle inner side,
A drain hole that opens to an inner peripheral surface of the end portion at a position closer to the vehicle inner side than the seal portion is provided at the end portion of the outer ring that is fitted to the vehicle-side assembly member. A hub unit, characterized in that the hub unit is formed so as to penetrate the portion in the radial direction.

The vehicle-side assembly member is formed in a cylindrical shape having both ends opened. In the vehicle assembly state, the outer ring is fitted into an opening on the vehicle outer side, and the inner peripheral surface of the vehicle-side assembly member The hub unit according to claim 1, wherein the vehicle-side assembly member is positioned so as to form an inner-side open space in which an end portion on the vehicle inner side is opened between the outer peripheral surface of the axle.

In the vehicle assembly state, the drain hole has an inner opening that opens on the inner space side of the outer ring, opens at a position overlapping the vehicle assembly member, and an outer opening that opens on the outer space side The hub unit according to claim 1 or 2, wherein the hub unit is opened at a position deviating toward the vehicle outer side in the axial direction with respect to the side assembly member.

The outer ring is
An outer ring main body in contact with the rolling element;
A flange portion projecting radially outward from an outer peripheral surface of the outer ring main body, and in contact with a vehicle outer side end portion of the vehicle side assembly member in the vehicle assembly state;
An inlay portion that protrudes inward in the axial direction from the vehicle inner side main surface of the flange portion and fits into the vehicle side assembly member in the vehicle assembly state, and forms an end on the vehicle inner side;
The drain hole is
A through hole formed through the inlay portion in a radial direction in the vehicle assembled state;
An axial groove formed in the axial direction on the outer circumferential surface of the inlay portion and reaching the vehicle inner side main surface of the flange portion;
A radial groove formed in a radial direction on the vehicle inner side main surface of the flange portion, an end portion on the inner side in the radial direction communicating with the axial groove, and an end portion on the outer side in the radial direction open to an outer peripheral surface of the flange portion The hub unit according to any one of claims 1 to 3, comprising:

2. A first inclined surface for drainage is formed in a portion of the outer ring located closer to the vehicle inner side than the drainage hole so that the inner peripheral surface of the outer ring expands toward the vehicle inner side. The hub unit of any one of thru | or 4.

A second inclined surface for drainage is formed in a portion of the outer ring located between the seal portion and the drainage hole so that an inner peripheral surface thereof is expanded in diameter toward the drainage hole. The hub unit according to any one of claims 1 to 5.

7. A rotation detection sensor is provided on a vehicle inner side of the outer ring so as to partially close a radial gap between the vehicle side assembly member and the axle. The hub unit according to claim 1.

The outer peripheral surface of the axle is shaped to gradually increase in diameter toward the vehicle inner side, and the inner peripheral surface of the mounting member is shaped to gradually increase in diameter toward the vehicle inner side corresponding to the outer peripheral surface shape of the axle. The hub unit according to any one of claims 1 to 7, wherein: