JP2009286310A - Bearing device for driving wheel - Google Patents

Bearing device for driving wheel Download PDF

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Publication number
JP2009286310A
JP2009286310A JP2008142373A JP2008142373A JP2009286310A JP 2009286310 A JP2009286310 A JP 2009286310A JP 2008142373 A JP2008142373 A JP 2008142373A JP 2008142373 A JP2008142373 A JP 2008142373A JP 2009286310 A JP2009286310 A JP 2009286310A
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Japan
Prior art keywords
joint member
outer joint
bearing device
ring
inner ring
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JP2008142373A
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Japanese (ja)
Inventor
Minoru Ishijima
実 石島
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NTN Corp
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NTN Corp
NTN Toyo Bearing Co Ltd
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Priority to JP2008142373A priority Critical patent/JP2009286310A/en
Publication of JP2009286310A publication Critical patent/JP2009286310A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/07—Fixing them on the shaft or housing with interposition of an element
    • F16C35/073—Fixing them on the shaft or housing with interposition of an element between shaft and inner race ring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • F16C19/18—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
    • F16C19/181—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact
    • F16C19/183—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles
    • F16C19/184—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement
    • F16C19/185—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement with two raceways provided integrally on a part other than a race ring, e.g. a shaft or housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • F16C19/18—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
    • F16C19/181—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact
    • F16C19/183—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles
    • F16C19/184—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement
    • F16C19/186—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement with three raceways provided integrally on parts other than race rings, e.g. third generation hubs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/52—Bearings with rolling contact, for exclusively rotary movement with devices affected by abnormal or undesired conditions
    • F16C19/527—Bearings with rolling contact, for exclusively rotary movement with devices affected by abnormal or undesired conditions related to vibration and noise
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00—Articles relating to transporting
    • F16C2326/01—Parts of vehicles in general
    • F16C2326/02—Wheel hubs or castors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
    • F16D1/10—Quick-acting couplings in which the parts are connected by simply bringing them together axially
    • F16D2001/103—Quick-acting couplings in which the parts are connected by simply bringing them together axially the torque is transmitted via splined connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/16—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
    • F16D3/20—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members
    • F16D3/22—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts
    • F16D3/223—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts the rolling members being guided in grooves in both coupling parts
    • F16D2003/22326—Attachments to the outer joint member, i.e. attachments to the exterior of the outer joint member or to the shaft of the outer joint member

Abstract

<P>PROBLEM TO BE SOLVED: To prevent an axial force from being lowered for a long time, and ensure stick-slip resistance. <P>SOLUTION: A bearing device for a driving wheel includes an outer ring 50 having double-row outer raceway surfaces 52 and 54 formed on the inner periphery thereof, a hub ring 10 and an inner ring 20 which have a wheel mounting flange 14 at one end thereof and respectively have double-row inner raceway surfaces 12 and 22 formed on their outer peripheries, and double-row rolling bodies 30 and 40 mounted between the outer raceway surfaces 52 and 54 of the outer ring 50 and the inner raceway surfaces 12 and 22 of the hub ring 10 and of the inner ring 20, and fits, by splines, a stem portion 66 extending from an outer joint member 62 of a constant velocity universal joint 60 into a shaft hole in the hub ring 10, wherein an inboard side end portion 24b of an inner ring 20b is abutted to a shoulder portion 61 of the outer joint member 62, and a ceramic coating film 63 is formed on an end surface of the shoulder portion 61 of the outer joint member 62. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、例えば自動車の懸架装置に対して駆動車輪（ＦＦ車の前輪、ＦＲ車の後輪、４ＷＤ車の全輪）を回転自在に支持する駆動車輪用軸受装置に関する。   The present invention relates to a drive wheel bearing device that rotatably supports drive wheels (front wheels of FF vehicles, rear wheels of FR vehicles, all wheels of 4WD vehicles), for example, with respect to a suspension system of an automobile.

自動車の軸受装置には、従動車輪用と駆動車輪用があり、それぞれの用途に応じて種々の形式のものが提案されている。例えば、図９は駆動車輪用軸受装置を例示する。この軸受装置は、ハブ輪１１０および内輪１２０、複列の転動体１３０，１４０、外輪１５０、等速自在継手１６０を主要な構成要素としている。   There are two types of bearing devices for automobiles, one for a driven wheel and one for a drive wheel. Various types of bearing devices have been proposed according to the respective applications. For example, FIG. 9 illustrates a drive wheel bearing device. This bearing device includes a hub wheel 110 and an inner ring 120, double-row rolling elements 130 and 140, an outer ring 150, and a constant velocity universal joint 160 as main components.

ハブ輪１１０は、そのアウトボード側の端部に、車輪（図示せず）を取り付けるための車輪取付フランジ１１４を備えている。この車輪取付フランジ１１４の円周方向等間隔に、ホイールディスクを固定するためのハブボルト１１６が植設されている。   The hub wheel 110 includes a wheel mounting flange 114 for mounting a wheel (not shown) at an end portion on the outboard side. Hub bolts 116 for fixing the wheel disc are implanted at equal intervals in the circumferential direction of the wheel mounting flange 114.

このハブ輪１１０の外周面に一対の内輪１２０ａ，１２０ｂを嵌合させ、一方の内輪１２０ａの外周面にアウトボード側の内側軌道面１２２ａが形成され、他方の内輪１２０ｂの外周面にインボード側の内側軌道面１２２ｂが形成されている。これらアウトボード側の内側軌道面１２２ａとインボード側の内側軌道面１２２ｂとで複列の内側軌道面を構成している。このハブ輪１１０の軸孔の内周面には、後述の等速自在継手１６０をトルク伝達可能に連結するための雌スプライン１１１が形成されている。   A pair of inner rings 120a and 120b are fitted to the outer peripheral surface of the hub wheel 110, an inner raceway surface 122a on the outboard side is formed on the outer peripheral surface of one inner ring 120a, and the inboard side is formed on the outer peripheral surface of the other inner ring 120b. The inner raceway surface 122b is formed. The outboard side inner raceway surface 122a and the inboard side inner raceway surface 122b constitute a double row inner raceway surface. On the inner peripheral surface of the shaft hole of the hub wheel 110, a female spline 111 for connecting a constant velocity universal joint 160, which will be described later, so as to transmit torque is formed.

外輪１５０は、内周面に内輪１２０ａ，１２０ｂの内側軌道面１２２ａ，１２２ｂと対向する複列の外側軌道面１５２，１５４が形成され、車体（図示せず）に取り付けるための車体取付フランジ１５６を備えている。この車体取付フランジ１５６は、車体の懸架装置（図示せず）から延びるナックルに取り付け孔１５８を利用してボルト等で固定される。   The outer ring 150 has double rows of outer raceway surfaces 152 and 154 facing the inner raceway surfaces 122a and 122b of the inner races 120a and 120b on the inner circumferential surface, and a vehicle body mounting flange 156 for mounting to a vehicle body (not shown). I have. The vehicle body attachment flange 156 is fixed to a knuckle extending from a vehicle suspension system (not shown) with a bolt or the like using an attachment hole 158.

軸受部１７０は、複列のアンギュラ玉軸受構造で、内輪１２０ａ，１２０ｂの外周面に形成された内側軌道面１２２ａ，１２２ｂと外輪１５０の内周面に形成された外側軌道面１５２，１５４との間に転動体１３０，１４０を介在させ、各列の転動体１３０，１４０を保持器１３２，１４２により円周方向等間隔に回転自在に保持した構造を有する。   The bearing portion 170 has a double-row angular contact ball bearing structure, and includes inner raceway surfaces 122a and 122b formed on the outer peripheral surface of the inner rings 120a and 120b and outer raceway surfaces 152 and 154 formed on the inner peripheral surface of the outer ring 150. The rolling elements 130 and 140 are interposed therebetween, and the rolling elements 130 and 140 in each row are rotatably held by the cages 132 and 142 at equal intervals in the circumferential direction.

軸受部１７０の両端開口部には、内輪１２０ａ，１２０ｂの外周面に摺接するように、外輪１５０と内輪１２０ａ，１２０ｂとの環状空間を密封する一対のシール１３４，１４４が外輪１５０の両端部内径に嵌合され、内部に充填された潤滑剤の漏洩ならびに外部からの水や異物の侵入を防止するようになっている。   A pair of seals 134 and 144 for sealing the annular space between the outer ring 150 and the inner rings 120a and 120b are formed at both end openings of the bearing part 170 so as to be in sliding contact with the outer peripheral surfaces of the inner rings 120a and 120b. And prevents leakage of the lubricant filled in the inside and intrusion of water and foreign matters from the outside.

前述したハブ輪１１０に等速自在継手１６０の外側継手部材１６２を連結することにより、軸受装置が構成される。等速自在継手１６０の外側継手部材１６２は、ドライブシャフトを構成する中間軸（図示せず）の一端に設けられ、内側継手部材、ボールおよびケージからなる内部部品（図示せず）を収容したカップ状のマウス部１６４と、そのマウス部１６４の基部から軸方向に一体に延びるステム部１６６とで構成されている。このステム部１６６の外周面には、前述のハブ輪１１０をトルク伝達可能に連結するための雄スプライン１６８が形成されている。   A bearing device is configured by connecting the outer joint member 162 of the constant velocity universal joint 160 to the hub wheel 110 described above. The outer joint member 162 of the constant velocity universal joint 160 is provided at one end of an intermediate shaft (not shown) constituting the drive shaft, and accommodates an internal part (not shown) composed of an inner joint member, a ball and a cage. And a stem portion 166 extending integrally from the base portion of the mouse portion 164 in the axial direction. On the outer peripheral surface of the stem portion 166, a male spline 168 for connecting the hub wheel 110 described above so as to be able to transmit torque is formed.

この外側継手部材１６２のステム部１６６をハブ輪１１０の軸孔に嵌合し、ステム部１６６の外周面に形成された雄スプライン１６８とハブ輪１１０の軸孔内周面に形成された雌スプライン１１１を嵌合させることにより、トルク伝達可能となっている。また、内輪１２０ｂのインボード側端部１２４ｂと外側継手部材１６２の肩部１６１との対向面とを突き合わせた状態で、ステム部１６６の端部に形成された雄ねじ部１６５にナット１７２を締め付けることによって、等速自在継手１６０をハブ輪１１０に固定する。このナットによる締め付け力（軸力）でもって軸受部１７０に予圧を付与している。   The stem portion 166 of the outer joint member 162 is fitted into the shaft hole of the hub wheel 110, and the male spline 168 formed on the outer peripheral surface of the stem portion 166 and the female spline formed on the inner peripheral surface of the hub ring 110. The torque can be transmitted by fitting 111. Further, the nut 172 is fastened to the male thread portion 165 formed at the end portion of the stem portion 166 in a state where the facing surface of the inboard side end portion 124b of the inner ring 120b and the shoulder portion 161 of the outer joint member 162 abut each other. Thus, the constant velocity universal joint 160 is fixed to the hub wheel 110. A preload is applied to the bearing portion 170 with a tightening force (axial force) by the nut.

ところで、前述した駆動輪用軸受装置では、軸受部１７０の内輪１２０ｂのインボード側端部１２４ｂと外側継手部材１６２の肩部１６１とが突き合わされた接触状態にあることから、例えば車両発進時、軸受部１７０の内輪１２０ｂのインボード側端部１２４ｂと外側継手部材１６２の肩部１６１との間で、カッキン音と通称されるスティックスリップ音が発生するおそれがある。   Incidentally, in the drive wheel bearing device described above, the inboard side end portion 124b of the inner ring 120b of the bearing portion 170 and the shoulder portion 161 of the outer joint member 162 are in contact with each other. There is a possibility that a stick-slip sound, commonly referred to as a cuckling noise, may be generated between the inboard side end portion 124b of the inner ring 120b of the bearing portion 170 and the shoulder portion 161 of the outer joint member 162.

このスティックスリップ音は、車両発進時、静止状態にある軸受部１７０の内輪１２０ｂに対して等速自在継手１６０の外側継手部材１６２から回転トルクが負荷されると、雌雄スプライン１１１，１６８を介して外側継手部材１６２からハブ輪１１０へ回転トルクを伝達しようとするが、外側継手部材１６２と軸受部１７０との間の伝達トルク変動と外側継手部材１６２のねじれにより、内輪１２０ｂのインボード側端部１２４ｂと外側継手部材１６２の肩部１６１との間で急激な滑りが発生する。この急激な滑りが原因となってスティックスリップ音が発生する。   This stick-slip noise is transmitted through the male and female splines 111 and 168 when a rotational torque is applied from the outer joint member 162 of the constant velocity universal joint 160 to the inner ring 120b of the bearing portion 170 in a stationary state when the vehicle starts. An attempt is made to transmit rotational torque from the outer joint member 162 to the hub wheel 110, but the inboard side end portion of the inner ring 120 b is caused by transmission torque fluctuation between the outer joint member 162 and the bearing portion 170 and torsion of the outer joint member 162. A sudden slip occurs between 124b and the shoulder 161 of the outer joint member 162. This sudden slip causes stick-slip noise.

前述したスティックスリップ音を未然に防止する手段として、軸受部１７０の内輪１２０ｂのインボード側端部１２４ｂと外側継手部材１６２の肩部１６１との対向面間に、摺動特性の優れた材料をコーティングしたプレートを挟み込む手段（例えば、特許文献１，２参照）が講じられている。   As a means for preventing the above-described stick-slip noise, a material having excellent sliding characteristics is provided between the facing surfaces of the inboard side end portion 124b of the inner ring 120b of the bearing portion 170 and the shoulder portion 161 of the outer joint member 162. Means (for example, see Patent Documents 1 and 2) for sandwiching the coated plate is taken.

これら特許文献１，２では、軸受部１７０の内輪１２０ｂのインボード側端部１２４ｂと外側継手部材１６２の肩部１６１との対向面間に前述のプレートを介在させることにより、その軸受部１７０の内輪１２０ｂのインボード側端部１２４ｂと外側継手部材１６２の肩部１６１との間での摩擦抵抗を小さくして積極的な滑りが生じるようにして、急激な滑りを発生させることなく、スティックスリップ音が発生しないようにしている。
特開２００３−９７５８８号公報 特表２００７−５０８９８６号公報 In these Patent Documents 1 and 2, the above-mentioned plate is interposed between the opposed surfaces of the inboard side end portion 124 b of the inner ring 120 b of the bearing portion 170 and the shoulder portion 161 of the outer joint member 162, whereby the bearing portion 170. The slip resistance is reduced without causing a sudden slip by reducing the frictional resistance between the inboard side end portion 124b of the inner ring 120b and the shoulder portion 161 of the outer joint member 162 to generate a positive slip. The sound is not generated.
JP 2003-97588 A Special table 2007-508986 gazette

ところで、特許文献１，２に開示された軸受装置では、前述したように、軸受部１７０のインボード側端部と外側継手部材１６２の肩部１６１との対向面間に、摺動特性の優れた環状のプレートを介在させることにより、スティックスリップ音の発生を未然に防止するようにしている。   Incidentally, in the bearing devices disclosed in Patent Documents 1 and 2, as described above, the sliding characteristics are excellent between the facing surfaces of the inboard side end portion of the bearing portion 170 and the shoulder portion 161 of the outer joint member 162. In addition, the occurrence of stick-slip noise is prevented by interposing an annular plate.

しかしながら、これら軸受装置で、ステム部１６６の端部に形成された雄ねじ部１６５にナット１７２を締め付けることによる軸力でもって等速自在継手１６０をハブ輪１１０に固定しているが、この軸受装置を長期に亘って使用することにより、環状のプレートが当接する軸受部１７０のインボード側端部と外側継手部材１６２の肩部１６１との対向面が摩耗し、ナット１７２の締め付けによる軸力が低下してしまう可能性がある。このような軸力の低下が生じると、ナット１７２が緩んだり、軸受部１７０の耐久性が損なわれるという不具合が発生することが懸念される。   However, in these bearing devices, the constant velocity universal joint 160 is fixed to the hub wheel 110 by an axial force by tightening the nut 172 to the male screw portion 165 formed at the end portion of the stem portion 166. Is used over a long period of time, the opposing surfaces of the inboard side end portion of the bearing portion 170 with which the annular plate abuts and the shoulder portion 161 of the outer joint member 162 are worn, and the axial force due to tightening of the nut 172 is reduced. There is a possibility of lowering. When such a reduction in axial force occurs, there is a concern that the nut 172 may be loosened or a problem may occur that the durability of the bearing portion 170 is impaired.

そこで、本発明は前述の問題点に鑑みて提案されたもので、その目的とするところは、軸力の低下を長期に亘って防止し、耐スティックスリップ性を確保し得る駆動車輪用軸受装置を提供することにある。   Accordingly, the present invention has been proposed in view of the above-described problems, and the object of the present invention is to provide a bearing device for a drive wheel that can prevent a reduction in axial force over a long period of time and ensure stick-slip resistance. Is to provide.

前述の目的を達成するための技術的手段として、本発明は、内周に複列の外側軌道面が形成された外方部材と、一端に車輪取付フランジを有すると共に外周に複列の内側軌道面を有し、ハブ輪と内輪からなる内方部材と、外方部材の外側軌道面と内方部材の内側軌道面との間に介装された複列の転動体とを備え、ハブ輪の軸孔に等速自在継手の外側継手部材から延びるステム部をスプライン嵌合させた駆動車輪用軸受装置において、外側継手部材の肩部と内方部材の端部の対向面間にセラミックス部を介在させたことを特徴とする。   As technical means for achieving the above-mentioned object, the present invention includes an outer member having a double-row outer raceway surface formed on the inner periphery, a wheel mounting flange at one end, and a double-row inner track on the outer periphery. A hub ring comprising an inner member comprising a hub ring and an inner ring, and a double row rolling element interposed between the outer raceway surface of the outer member and the inner raceway surface of the inner member. In the drive wheel bearing device in which the stem portion extending from the outer joint member of the constant velocity universal joint is spline-fitted into the shaft hole, the ceramic portion is disposed between the opposing surfaces of the shoulder portion of the outer joint member and the end portion of the inner member. It is characterized by being interposed.

本発明では、外側継手部材の肩部と内方部材の端部との対向面間にセラミックス部を介在させたことにより、内方部材を有する軸受部と外側継手部材との間の伝達トルク変動と外側継手部材のねじれが生じても、その軸受部と外側継手部材の金属同士が接触することを回避することで、軸受部と外側継手部材の金属同士の凝着から急激な滑りが発生することなく、スティックスリップ音の発生を未然に防止することができる。   In the present invention, the transmission torque fluctuation between the bearing portion having the inner member and the outer joint member is obtained by interposing the ceramic portion between the facing surfaces of the shoulder portion of the outer joint member and the end portion of the inner member. Even if the torsion of the outer joint member occurs, a sudden slip occurs from the adhesion of the metal of the bearing portion and the outer joint member by avoiding contact between the metal of the bearing portion and the outer joint member. Therefore, the occurrence of stick-slip noise can be prevented in advance.

また、セラミックス部を介在させたことで、軸受装置を長期に亘って使用しても、外側継手部材の肩部と内方部材の端部との対向面が経年変化で摩耗することを未然に防止することができる。その結果、軸力の低下を長期に亘って防止することが可能となる。   In addition, by interposing the ceramic part, it is possible to prevent the opposed surfaces of the shoulder part of the outer joint member and the end part of the inner member from being worn over time even when the bearing device is used for a long time. Can be prevented. As a result, it is possible to prevent a decrease in axial force over a long period of time.

本発明におけるセラミックス部は、外側継手部材の肩部と内方部材の端部との対向面のいずれか一方に形成されたコーティング膜で構成することが可能である。つまり、外側継手部材の肩部端面にコーティング膜を形成するか、あるいは、内方部材の端部端面にコーティング膜を形成する。   The ceramic part in the present invention can be constituted by a coating film formed on either one of the opposing surfaces of the shoulder part of the outer joint member and the end part of the inner member. That is, a coating film is formed on the shoulder end face of the outer joint member, or a coating film is formed on the end face of the inner member.

また、本発明におけるセラミックス部は、外側継手部材の肩部と内方部材の端部の対向面間に挟み込まれたプレートの端面の少なくとも一方に形成されたコーティング層で構成することが可能である。つまり、外側継手部材の肩部と内方部材の端部の対向面間にプレートを挟み込み、そのプレートの外側継手部材側の端面にコーティング層を形成するか、あるいは、プレートの内方部材側の端面にコーティング層を形成する。プレートの外側継手部材側および内方部材側の両端面にコーティング層を形成するようにしてもよい。   Further, the ceramic portion in the present invention can be constituted by a coating layer formed on at least one of the end surfaces of the plate sandwiched between the opposing surfaces of the shoulder portion of the outer joint member and the end portion of the inner member. . That is, the plate is sandwiched between the opposing surfaces of the shoulder portion of the outer joint member and the end portion of the inner member, and a coating layer is formed on the end surface of the plate on the outer joint member side, or on the inner member side of the plate. A coating layer is formed on the end face. A coating layer may be formed on both end surfaces of the outer joint member side and the inner member side of the plate.

なお、前述のプレートは、その素材をステンレス鋼とすることが望ましい。このようにすれば、プレート自体に防錆作用を発揮させることができ、錆の発生を未然に防止でき、自動車などの長期に亘る防錆性能を要求される使用環境にも対応可能となる。   In addition, it is desirable that the above-mentioned plate is made of stainless steel. In this way, the plate itself can exhibit a rust-proofing effect, the rust can be prevented from occurring, and it is possible to cope with a usage environment that requires a long-term rust-proofing performance such as an automobile.

また、前述のプレートを、焼入れされた表面硬度の高い材料とし、表面全体にコーティング層を設けることにより、軸力による素材の潰れを防止出来ると共に、錆の発生を未然に防止でき、自動車などの長期に亘る防錆性能を要求される使用環境にも対応可能となる。   Moreover, the above-mentioned plate is made of a hardened material having a high surface hardness, and by providing a coating layer on the entire surface, it is possible to prevent the material from being crushed by an axial force, and to prevent the occurrence of rust in advance. It can also be used in a usage environment that requires long-term rust prevention performance.

さらに、本発明におけるセラミックス部は、外側継手部材の肩部と内方部材の端部の対向面間に挟み込まれたプレート形状に成形することが可能である。このようにプレート自体の素材をセラミックスとした場合、他の金属材料からなるプレートと比較して重量の増加を低減することができて軸受装置の軽量化が図れる。   Furthermore, the ceramic portion in the present invention can be formed into a plate shape that is sandwiched between facing surfaces of the shoulder portion of the outer joint member and the end portion of the inner member. In this way, when the material of the plate itself is made of ceramics, an increase in weight can be reduced as compared with a plate made of another metal material, and the weight of the bearing device can be reduced.

なお、この軸受装置は、ハブ輪の外周面に一対の内輪を嵌合させ、一方の内輪の外周面にアウトボード側の内側軌道面を形成し、他方の内輪の外周面にインボード側の内側軌道面を形成したタイプに適用可能で、この場合、インボード側に位置する他方の内輪のインボード側端部を外側継手部材の肩部と対向させた構造となる。   In this bearing device, a pair of inner rings is fitted to the outer peripheral surface of the hub wheel, an inner raceway surface on the outboard side is formed on the outer peripheral surface of one inner ring, and an inboard side surface is formed on the outer peripheral surface of the other inner ring. The present invention can be applied to a type in which an inner raceway surface is formed. In this case, the inboard side end portion of the other inner ring located on the inboard side is opposed to the shoulder portion of the outer joint member.

また、この軸受装置は、前述したタイプ以外に、一方の内側軌道面が形成されたハブ輪の外周面に小径段部を形成し、その小径段部に他方の内側軌道面が形成された内輪を圧入した上でハブ輪の小径段部の端部を加締めたタイプにも適用可能で、この場合、ハブ輪の加締め部を外側継手部材の肩部と対向させた構造となる。   In addition to the type described above, this bearing device has an inner ring in which a small-diameter step portion is formed on the outer peripheral surface of the hub ring on which one inner raceway surface is formed, and the other inner raceway surface is formed on the small-diameter step portion. Can be applied to a type in which the end of the small-diameter step portion of the hub ring is crimped, and in this case, the structure is such that the crimped portion of the hub ring is opposed to the shoulder portion of the outer joint member.

本発明では、外側継手部材の肩部と内方部材の端部との対向面間にセラミックス部を介在させた構造としている。これにより、車両発進時、静止状態にある軸受部のハブ輪に対して等速自在継手の外側継手部材から回転トルクが負荷された場合、内方部材を有する軸受部と外側継手部材との間の伝達トルク変動と外側継手部材のねじれが生じても、その軸受部と外側継手部材の金属同士が接触することを回避することで、軸受部と外側継手部材の金属同士の凝着から急激な滑りが発生することはない。その結果、スティックスリップ音の発生を未然に防止することができ、静粛性の向上が図れて搭乗者の違和感を解消することができる。   In this invention, it is set as the structure which interposed the ceramic part between the opposing surfaces of the shoulder part of an outer joint member, and the edge part of an inner member. As a result, when a rotational torque is applied from the outer joint member of the constant velocity universal joint to the hub wheel of the bearing portion in a stationary state when the vehicle starts, the space between the bearing portion having the inner member and the outer joint member is reduced. Even if the transmission torque fluctuation of the outer joint member and the torsion of the outer joint member occur, the metal of the bearing portion and the outer joint member is prevented from coming into contact with each other. Slip does not occur. As a result, it is possible to prevent the occurrence of stick-slip noise, improve quietness, and eliminate a sense of discomfort for the passenger.

また、セラミックス部を介在させたことで、軸受装置を長期に亘って使用しても、外側継手部材の肩部と内方部材の端部との対向面が経年変化で摩耗することを未然に防止することができる。その結果、軸力の低下を長期に亘って防止し、耐スティックスリップ性を確保し得る駆動車輪用軸受装置を提供することができる。   In addition, by interposing the ceramic part, it is possible to prevent the opposed surfaces of the shoulder part of the outer joint member and the end part of the inner member from being worn over time even when the bearing device is used for a long time. Can be prevented. As a result, it is possible to provide a drive wheel bearing device that can prevent a reduction in axial force over a long period of time and can secure stick-slip resistance.

本発明に係る駆動車輪用軸受装置の実施形態を以下に詳述する。図１に示す第一の実施形態の軸受装置は、内方部材であるハブ輪１０および内輪２０ａ，２０ｂ、複列の転動体３０，４０、外方部材である外輪５０、等速自在継手６０を主要な構成要素としている。なお、以下の説明では、車両に組み付けた状態で、車両の外側寄りとなる側をアウトボード側（図面左側）と呼び、中央寄りとなる側をインボード側（図面右側）と呼ぶ。   Embodiments of a drive wheel bearing device according to the present invention will be described in detail below. The bearing device of the first embodiment shown in FIG. 1 includes a hub ring 10 and inner rings 20a and 20b that are inner members, double-row rolling elements 30 and 40, an outer ring 50 that is an outer member, and a constant velocity universal joint 60. Is the main component. In the following description, the side closer to the outside of the vehicle in the state assembled to the vehicle is referred to as the outboard side (left side in the drawing), and the side closer to the center is referred to as the inboard side (right side in the drawing).

ハブ輪１０は、そのアウトボード側の端部に、車輪（図示せず）を取り付けるための車輪取付フランジ１４を備えている。この車輪取付フランジ１４の円周方向等間隔に、ホイールディスクを固定するためのハブボルト１６が植設されている。   The hub wheel 10 includes a wheel mounting flange 14 for mounting a wheel (not shown) at an end portion on the outboard side. Hub bolts 16 for fixing the wheel disc are implanted at equal intervals in the circumferential direction of the wheel mounting flange 14.

このハブ輪１０の外周面に一対の内輪２０ａ，２０ｂを嵌合させ、アウトボード側に位置する一方の内輪２０ａの外周面にアウトボード側の内側軌道面２２ａが形成され、インボード側に位置する他方の内輪２０ｂの外周面にインボード側の内側軌道面２２ｂが形成されている。これらアウトボード側の内側軌道面２２ａとインボード側の内側軌道面２２ｂとで複列の内側軌道面を構成している。このハブ輪１０の軸孔の内周面には、等速自在継手６０をトルク伝達可能に連結するための雌スプライン１１が形成されている。   A pair of inner rings 20a and 20b are fitted to the outer peripheral surface of the hub wheel 10, and an inner raceway surface 22a on the outboard side is formed on the outer peripheral surface of one inner ring 20a located on the outboard side, and is positioned on the inboard side. An inner raceway surface 22b on the inboard side is formed on the outer peripheral surface of the other inner ring 20b. These outboard side inner raceway surface 22a and inboard side inner raceway surface 22b constitute a double row inner raceway surface. A female spline 11 for connecting the constant velocity universal joint 60 so as to transmit torque is formed on the inner peripheral surface of the shaft hole of the hub wheel 10.

外輪５０は、内周面に内輪２０ａ，２０ｂの内側軌道面２２ａ，２２ｂと対向する複列の外側軌道面５２，５４が形成され、車体（図示せず）に取り付けるための車体取付フランジ５６を備えている。この車体取付フランジ５６は、車体の懸架装置（図示せず）から延びるナックルに取り付け孔５８を利用してボルト等で固定される。   The outer ring 50 is formed with double row outer raceway surfaces 52 and 54 facing the inner raceway surfaces 22a and 22b of the inner races 20a and 20b on the inner peripheral surface, and a vehicle body attachment flange 56 for attaching to a vehicle body (not shown). I have. The vehicle body attachment flange 56 is fixed to a knuckle extending from a suspension device (not shown) of the vehicle body with a bolt or the like using an attachment hole 58.

軸受部７０は、複列のアンギュラ玉軸受構造で、内輪２０ａ，２０ｂの外周面に形成された内側軌道面２２ａ，２２ｂと外輪５０の内周面に形成された外側軌道面５２，５４との間に転動体３０，４０を介在させ、各列の転動体３０，４０を保持器３２，４２により円周方向等間隔に回転自在に保持した構造を有する。   The bearing portion 70 has a double-row angular contact ball bearing structure, and includes inner raceway surfaces 22a and 22b formed on the outer peripheral surfaces of the inner rings 20a and 20b and outer raceway surfaces 52 and 54 formed on the inner peripheral surface of the outer ring 50. The rolling elements 30 and 40 are interposed therebetween, and the rolling elements 30 and 40 in each row are held by the cages 32 and 42 so as to be rotatable at equal intervals in the circumferential direction.

軸受部７０の両端開口部には、内輪２０ａ，２０ｂの外周面に摺接するように、外輪５０と内輪２０ａ，２０ｂとの環状空間を密封する一対のシール３４，４４が外輪５０の両端部内径に嵌合され、内部に充填されたグリースの漏洩ならびに外部からの水や異物の侵入を防止するようになっている。   A pair of seals 34, 44 that seal the annular space between the outer ring 50 and the inner rings 20 a, 20 b so as to be in sliding contact with the outer peripheral surfaces of the inner rings 20 a, 20 b are formed at both end openings of the bearing part 70. In this way, leakage of grease filled in the inside and intrusion of water and foreign matters from the outside are prevented.

前述したハブ輪１０に等速自在継手６０の外側継手部材６２を連結することにより、軸受装置が構成される。等速自在継手６０の外側継手部材６２は、ドライブシャフトを構成する中間軸（図示せず）の一端に設けられ、内側継手部材、ボールおよびケージからなる内部部品（図示せず）を収容したカップ状のマウス部６４と、そのマウス部６４の基部から軸方向に一体に延びるステム部６６とで構成されている。このステム部６６の外周面には、前述のハブ輪１０をトルク伝達可能に連結するための雄スプライン６８が形成されている。   A bearing device is configured by connecting the outer joint member 62 of the constant velocity universal joint 60 to the hub wheel 10 described above. The outer joint member 62 of the constant velocity universal joint 60 is provided at one end of an intermediate shaft (not shown) constituting the drive shaft, and accommodates an internal part (not shown) composed of an inner joint member, a ball and a cage. And a stem portion 66 integrally extending in the axial direction from the base portion of the mouse portion 64. On the outer peripheral surface of the stem portion 66, a male spline 68 for connecting the hub wheel 10 described above so as to transmit torque is formed.

この外側継手部材６２のステム部６６をハブ輪１０の軸孔に嵌合し、ステム部６６の外周面に形成された雄スプライン６８とハブ輪１０の軸孔内周面に形成された雌スプライン１１を嵌合させることにより、トルク伝達可能となっている。この時、ステム部６６の端部に形成された雄ねじ部６５にナット７２を締め付けることによって、等速自在継手６０をハブ輪１０に固定すると共にそのナット７２による締め付け力（軸力）でもって軸受部７０に予圧を付与している。なお、等速自在継手６０とハブ輪１０は、前述のナット７２以外に、ボルトにより固定することも可能である。   The stem portion 66 of the outer joint member 62 is fitted into the shaft hole of the hub wheel 10, and the male spline 68 formed on the outer peripheral surface of the stem portion 66 and the female spline formed on the inner peripheral surface of the shaft wheel 66. The torque can be transmitted by fitting 11. At this time, the constant velocity universal joint 60 is fixed to the hub wheel 10 by tightening the nut 72 to the male thread portion 65 formed at the end of the stem portion 66, and the bearing is held with the tightening force (axial force) by the nut 72. A preload is applied to the portion 70. The constant velocity universal joint 60 and the hub wheel 10 can be fixed by bolts in addition to the nut 72 described above.

図１に示す第一の実施形態では、外側継手部材６２の肩部６１の端面（内輪２０ｂのインボード側端部２４ｂとの対向面）にセラミックス部であるコーティング膜６３を形成し、ナット７２による所定の締付力（軸力）でもって、軸受部７０の内輪２０ｂのインボード側端部２４ｂの端面（外側継手部材６２の肩部６１との対向面）に当接させている。この第一の実施形態では、コーティング膜６３を外側継手部材６２の肩部６１の端面に被着させているが、図２に示す第二の実施形態のように、内輪２０ｂのインボード側端部２４ｂの端面にコーティング膜２６ｂを形成するようにしてもよい。これらコーティング膜６３，２６ｂを形成する方法としては、イオンプレーティング法やプラズマ溶射法等を使用することが可能である。   In the first embodiment shown in FIG. 1, a coating film 63 that is a ceramic part is formed on the end surface of the shoulder 61 of the outer joint member 62 (the surface facing the inboard side end 24 b of the inner ring 20 b), and a nut 72. With a predetermined tightening force (axial force), the end surface of the inboard side end 24b of the inner ring 20b of the bearing portion 70 (the surface facing the shoulder portion 61 of the outer joint member 62) is brought into contact. In the first embodiment, the coating film 63 is attached to the end face of the shoulder portion 61 of the outer joint member 62. However, as in the second embodiment shown in FIG. The coating film 26b may be formed on the end surface of the portion 24b. As a method for forming these coating films 63 and 26b, an ion plating method, a plasma spraying method, or the like can be used.

また、図３に示す第三の実施形態では、外側継手部材６２の肩部６１の端面と内輪２０ｂのインボード側端部２４ｂの端面との間に環状のプレート８０を挟み込み、そのプレート８０の外側継手部材側の端面にセラミックス部であるコーティング層８２を被着形成し、外側継手部材６２の肩部６１の端面に当接させた構造を具備する。この第三の実施形態では、プレート８０の外側継手部材側の端面にコーティング層８２を形成しているが、図４に示す第四の実施形態のように、プレート８０の内輪側の端面にコーティング層８４を被着形成するようにしてもよい。また、図５に示す第五の実施形態のように、プレートの外側継手部材側および内輪側の両端面にコーティング層８２，８４を形成することも可能である。これらコーティング層８２，８４を形成する方法としては、イオンプレーティング法やプラズマ溶射法等を使用することが可能である。   In the third embodiment shown in FIG. 3, an annular plate 80 is sandwiched between the end surface of the shoulder portion 61 of the outer joint member 62 and the end surface of the inboard side end portion 24b of the inner ring 20b. The coating layer 82 which is a ceramic part is deposited and formed on the end surface on the outer joint member side, and the structure is in contact with the end surface of the shoulder 61 of the outer joint member 62. In the third embodiment, the coating layer 82 is formed on the end surface of the plate 80 on the outer joint member side, but the end surface on the inner ring side of the plate 80 is coated as in the fourth embodiment shown in FIG. The layer 84 may be deposited. Further, as in the fifth embodiment shown in FIG. 5, it is also possible to form the coating layers 82 and 84 on both end faces of the outer joint member side and the inner ring side of the plate. As a method for forming these coating layers 82 and 84, an ion plating method, a plasma spraying method, or the like can be used.

なお、前述のプレート８０の素材としてはステンレス鋼が好ましい。このようにすれば、プレート自体に防錆作用を発揮させることができ、錆の発生を未然に防止でき、自動車などの長期に亘る防錆性能を要求される使用環境にも対応可能となる。   In addition, as a raw material of the above-mentioned plate 80, stainless steel is preferable. In this way, the plate itself can exhibit a rust-proofing effect, the rust can be prevented from occurring, and it is possible to cope with a usage environment that requires a long-term rust-proofing performance such as an automobile.

また、前述のプレート８０を、焼入れされた表面硬度の高い材料（Ｓ４５ＣやＳＵＪ２等）とすることも可能である。その場合、表面全体にコーティング層を設けることにより、軸力による素材の潰れを防止出来ると共に、錆の発生を未然に防止でき、自動車などの長期に亘る防錆性能を要求される使用環境にも対応可能となる。   Further, the above-described plate 80 can be made of a hardened material with high surface hardness (S45C, SUJ2, etc.). In that case, by providing a coating layer on the entire surface, it is possible to prevent the material from being crushed due to axial force, and also to prevent the occurrence of rust, and even in environments where long-term rust prevention performance is required, such as automobiles. It becomes possible to respond.

図６に示す第六の実施形態では、外側継手部材６２の肩部６１の端面と内輪２０ｂのインボード側端部２４ｂの端面との間にセラミックス部である環状のプレート８１を挟み込み、そのプレート自体の素材をセラミックスで構成したものである。このようにプレート自体の素材をセラミックスとした場合、前述した第三〜第五の実施形態のようにステンレス鋼などの金属材料からなるプレート８０と比較して重量の増加を低減することができて軸受装置の軽量化が図れる。   In the sixth embodiment shown in FIG. 6, an annular plate 81 that is a ceramic portion is sandwiched between the end surface of the shoulder portion 61 of the outer joint member 62 and the end surface of the inboard side end portion 24b of the inner ring 20b. The material itself is made of ceramics. Thus, when the material of the plate itself is made of ceramics, an increase in weight can be reduced as compared with the plate 80 made of a metal material such as stainless steel as in the third to fifth embodiments described above. The weight of the bearing device can be reduced.

以上で述べた第一および第二の実施形態の軸受装置では、外側継手部材６２の肩部６１の端面あるいは内輪２０ｂのインボード側端部２４ｂの端面にセラミックスのコーティング膜６３，２６ｂを形成し、第三〜第五の実施形態の軸受装置では、セラミックスのコーティング層８２，８４が形成された環状のプレート８０を、外側継手部材６２の肩部６１の端面と内輪２０ｂのインボード側端部２４ｂの端面との間で挟み込んだ構造とし、第六の実施形態の軸受装置では、外側継手部材６２の肩部６１の端面と内輪２０ｂのインボード側端部２４ｂの端面との間にセラミックス製のプレート８１を挟み込んだ構造としている。これらコーティング膜６３，２６ｂ、コーティング層８２，８４およびプレート８１自体を構成するセラミックス素材としては、窒化ケイ素、窒化ホウ素、酸化マグネシウム、酸化アルミニューム、酸化チタン等を使用することが可能である。   In the bearing devices of the first and second embodiments described above, the ceramic coating films 63 and 26b are formed on the end surface of the shoulder portion 61 of the outer joint member 62 or the end surface of the inboard side end portion 24b of the inner ring 20b. In the bearing devices of the third to fifth embodiments, the annular plate 80 on which the ceramic coating layers 82 and 84 are formed is connected to the end surface of the shoulder portion 61 of the outer joint member 62 and the inboard side end portion of the inner ring 20b. In the bearing device of the sixth embodiment, the structure is sandwiched between the end surface of the outer joint member 24b and the end surface of the shoulder portion 61 of the outer joint member 62 and the end surface of the inboard side end portion 24b of the inner ring 20b. The plate 81 is sandwiched. As a ceramic material constituting the coating films 63 and 26b, the coating layers 82 and 84, and the plate 81 itself, silicon nitride, boron nitride, magnesium oxide, aluminum oxide, titanium oxide, or the like can be used.

これにより、第一〜第六の実施形態における各軸受装置では、軸受部７０と外側継手部材６２との間の伝達トルク変動と外側継手部材６２のねじれが生じても、その軸受部７０と外側継手部材６２の金属同士が接触することを回避することで、軸受部７０と外側継手部材６２の金属同士の凝着から急激な滑りが発生することなく、スティックスリップ音の発生を未然に防止することができる。また、軸受装置を長期に亘って使用しても、外側継手部材６２の肩部６１の端面と内輪２０ｂのインボード側端部２４ｂの端面が経年変化で摩耗することを未然に防止することができる。その結果、軸力の低下を長期に亘って防止することが可能となる。   Thereby, in each bearing device in the first to sixth embodiments, even if transmission torque fluctuation between the bearing portion 70 and the outer joint member 62 and torsion of the outer joint member 62 occur, the bearing portion 70 and the outer side By avoiding the metals of the joint member 62 from coming into contact with each other, it is possible to prevent the occurrence of stick-slip noise without causing a sudden slip from the adhesion between the metal of the bearing portion 70 and the outer joint member 62. be able to. Further, even when the bearing device is used for a long period of time, it is possible to prevent the end surface of the shoulder portion 61 of the outer joint member 62 and the end surface of the inboard side end portion 24b of the inner ring 20b from being worn due to aging. it can. As a result, it is possible to prevent a decrease in axial force over a long period of time.

以上で説明した第一〜第六の実施形態では、ハブ輪１０の外周面に一対の内輪２０ａ，２０ｂを嵌合させ、インボード側に位置する他方の内輪２０ｂのインボード側端部２４ｂを外側継手部材６２の肩部６１に対向させたタイプの軸受装置に適用した場合について説明したが、本発明はこれに限定されることはない。   In the first to sixth embodiments described above, the pair of inner rings 20a and 20b are fitted to the outer peripheral surface of the hub wheel 10, and the inboard side end 24b of the other inner ring 20b located on the inboard side is used. Although the case where it applied to the bearing device of the type made to oppose the shoulder part 61 of the outer joint member 62 was demonstrated, this invention is not limited to this.

例えば、図７および図８に示すように、一方の内側軌道面１２が形成されたハブ輪１０の外周面に小径段部１８を形成し、その小径段部１８に他方の内側軌道面２２が形成された内輪２０を圧入した上でハブ輪１０の小径段部１８の端部を加締め、その加締め部１３を外側継手部材６２の肩部６１に対向させたタイプの軸受装置にも適用可能である。   For example, as shown in FIGS. 7 and 8, a small diameter step portion 18 is formed on the outer peripheral surface of the hub wheel 10 on which one inner raceway surface 12 is formed, and the other inner raceway surface 22 is formed on the small diameter step portion 18. The present invention is also applicable to a type of bearing device in which the formed inner ring 20 is press-fitted and the end portion of the small-diameter step portion 18 of the hub wheel 10 is swaged, and the swaged portion 13 is opposed to the shoulder portion 61 of the outer joint member 62. Is possible.

このタイプの軸受装置では、ハブ輪１０の外周面に形成されたアウトボード側の内側軌道面１２と、内輪２０の外周面に形成されたインボード側の内側軌道面２２とで複列の内側軌道面を構成している。この内輪２０をハブ輪１０の小径段部１８に圧入し、ハブ輪１０の小径段部１８の端部を外側に加締めることにより、その加締め部１３でもって内輪２０を抜け止めしてハブ輪１０と一体化し、軸受部７０に予圧を付与している。   In this type of bearing device, the inner raceway 12 on the outboard side formed on the outer peripheral surface of the hub wheel 10 and the inner raceway surface 22 on the inboard side formed on the outer peripheral surface of the inner ring 20 are arranged in a double row. It constitutes the raceway surface. The inner ring 20 is press-fitted into the small-diameter step portion 18 of the hub wheel 10, and the end portion of the small-diameter step portion 18 of the hub wheel 10 is crimped to the outside, so that the inner ring 20 is prevented from coming off with the crimping portion 13. The bearing 10 is integrated with the wheel 10 to apply a preload.

図７に示す第七の実施形態では、ハブ輪１０の加締め部１３の端面を外側継手部材６２の肩部６１の端面に当接させた構造を具備し、図１および図２に示す第一および第二の実施形態と同様、外側継手部材６２の肩部６１の端面あるいはハブ輪１０の加締め部１３の端面のいずれか一方にセラミックスのコーティング膜を形成する。   The seventh embodiment shown in FIG. 7 includes a structure in which the end surface of the crimped portion 13 of the hub wheel 10 is in contact with the end surface of the shoulder portion 61 of the outer joint member 62, and is shown in FIGS. 1 and 2. As in the first and second embodiments, a ceramic coating film is formed on either the end surface of the shoulder portion 61 of the outer joint member 62 or the end surface of the crimped portion 13 of the hub wheel 10.

この第七の実施形態においても、第一および第二の実施形態と同様、ステム部６６の端部に形成された雄ねじ部６５にナット７２を締め付けることによって、等速自在継手６０をハブ輪１０に固定し、そのナット７２による所定の締付力（軸力）でもって、ハブ輪１０の加締め部１３の端面を外側継手部材６２の肩部６１の端面に当接させた構造としている。この第七の実施形態において、外側継手部材６２の肩部６１の端面あるいはハブ輪１０の加締め部１３の端面のいずれか一方にセラミックスのコーティング膜を形成したことによる作用効果については、第一および第二の実施形態と同様であるため、重複説明は省略する。   Also in the seventh embodiment, as in the first and second embodiments, the constant velocity universal joint 60 is connected to the hub wheel 10 by tightening the nut 72 to the male screw portion 65 formed at the end portion of the stem portion 66. The end surface of the crimping portion 13 of the hub wheel 10 is brought into contact with the end surface of the shoulder portion 61 of the outer joint member 62 with a predetermined tightening force (axial force) by the nut 72. In the seventh embodiment, the effect obtained by forming the ceramic coating film on either the end surface of the shoulder 61 of the outer joint member 62 or the end surface of the crimped portion 13 of the hub wheel 10 is as follows. And since it is the same as that of 2nd embodiment, duplication description is abbreviate | omitted.

図８に示す第八の実施形態では、ハブ輪１０の加締め部１３の端面と外側継手部材６２の肩部６１の端面との間にセラミックスのプレート８０，８１を介在させた構造を具備する。この第八の実施形態でも、第三〜第五の実施形態のように、外側継手部材側あるいはハブ輪側の少なくとも一方にセラミックスのコーティング層を形成したプレートを使用するか、あるいは、第六の実施形態のようにプレート自体をセラミックスの素材で構成すればよい。   The eighth embodiment shown in FIG. 8 includes a structure in which ceramic plates 80 and 81 are interposed between the end surface of the crimped portion 13 of the hub wheel 10 and the end surface of the shoulder portion 61 of the outer joint member 62. . Also in the eighth embodiment, as in the third to fifth embodiments, a plate in which a ceramic coating layer is formed on at least one of the outer joint member side or the hub wheel side is used. The plate itself may be made of a ceramic material as in the embodiment.

この第八の実施形態においても、第三〜第六の実施形態と同様、ステム部６６の端部に形成された雄ねじ部６５にナット７２を締め付けることによって、等速自在継手６０をハブ輪１０に固定し、そのナット７２による所定の締付力（軸力）でもって、外側継手部材６２の肩部６１とハブ輪１０の加締め部１３との対向面間に環状のプレート８０，８１を挟み込んだ構造としている。この第八の実施形態において、外側継手部材６２の肩部６１の端面とハブ輪１０の加締め部１３の端面との間にセラミックスのプレート８０，８１を介在させたことによる作用効果については、第三〜第六の実施形態と同様であるため、重複説明は省略する。   Also in the eighth embodiment, as in the third to sixth embodiments, the constant velocity universal joint 60 is connected to the hub wheel 10 by tightening the nut 72 to the male screw portion 65 formed at the end portion of the stem portion 66. The annular plates 80 and 81 are placed between the opposing surfaces of the shoulder portion 61 of the outer joint member 62 and the caulking portion 13 of the hub wheel 10 with a predetermined tightening force (axial force) by the nut 72. It has a sandwiched structure. In the eighth embodiment, with respect to the operation and effect obtained by interposing the ceramic plates 80 and 81 between the end surface of the shoulder portion 61 of the outer joint member 62 and the end surface of the crimped portion 13 of the hub wheel 10, Since it is the same as that of 3rd-6th embodiment, duplication description is abbreviate | omitted.

本発明は前述した実施形態に何ら限定されるものではなく、本発明の要旨を逸脱しない範囲内において、さらに種々なる形態で実施し得ることは勿論のことであり、本発明の範囲は、特許請求の範囲によって示され、さらに特許請求の範囲に記載の均等の意味、および範囲内のすべての変更を含む。   The present invention is not limited to the above-described embodiments, and can of course be implemented in various forms without departing from the scope of the present invention. The scope of the present invention is not limited to patents. It includes the equivalent meanings recited in the claims, and the equivalent meanings recited in the claims, and all modifications within the scope.

本発明における第一の実施形態で、外側継手部材の肩部の端面にセラミックスコーティング膜を形成した軸受装置を示す縦断面図である。1 is a longitudinal sectional view showing a bearing device in which a ceramic coating film is formed on an end face of a shoulder portion of an outer joint member in the first embodiment of the present invention. 本発明における第二の実施形態で、内輪のインボード側端部の端面にセラミックスコーティング膜を形成した軸受装置を示す縦断面図である。It is a longitudinal cross-sectional view which shows the bearing apparatus which formed the ceramic coating film in the end surface of the inboard side edge part of an inner ring | wheel in 2nd embodiment in this invention. 本発明における第三の実施形態で、外側継手部材の肩部と内輪のインボード側端部との間にプレートを介在させ、そのプレートの外側継手部材側の端面にセラミックスコーティング層を形成した軸受装置を示す縦断面図である。In the third embodiment of the present invention, a bearing in which a plate is interposed between the shoulder portion of the outer joint member and the inboard side end portion of the inner ring, and a ceramic coating layer is formed on the end surface of the plate on the outer joint member side It is a longitudinal cross-sectional view which shows an apparatus. 本発明における第四の実施形態で、外側継手部材の肩部と内輪のインボード側端部との間にプレートを介在させ、そのプレートの内輪側の端面にセラミックスコーティング層を形成した軸受装置を示す縦断面図である。In the fourth embodiment of the present invention, there is provided a bearing device in which a plate is interposed between the shoulder portion of the outer joint member and the inboard side end portion of the inner ring, and a ceramic coating layer is formed on the inner ring side end surface of the plate. It is a longitudinal cross-sectional view shown. 本発明における第五の実施形態で、外側継手部材の肩部と内輪のインボード側端部との間にプレートを介在させ、そのプレートの外側継手部材側および内輪側の両端面にセラミックスコーティング層を形成した軸受装置を示す縦断面図である。In the fifth embodiment of the present invention, a plate is interposed between the shoulder portion of the outer joint member and the inboard side end portion of the inner ring, and the ceramic coating layer is formed on both end surfaces of the outer joint member side and the inner ring side of the plate. It is a longitudinal cross-sectional view which shows the bearing apparatus which formed. 本発明における第六の実施形態で、外側継手部材の肩部と内輪のインボード側端部との間にプレートを介在させ、そのプレート自体をセラミックスで構成した軸受装置を示す縦断面図である。FIG. 10 is a longitudinal sectional view showing a bearing device in which a plate is interposed between a shoulder portion of an outer joint member and an inboard side end portion of an inner ring in the sixth embodiment of the present invention, and the plate itself is made of ceramics. . 本発明における第七の実施形態で、第一および第二の実施形態を、ハブ輪の小径段部を加締めたタイプの軸受装置に適用した例を示す縦断面図である。FIG. 10 is a longitudinal sectional view showing an example in which the first and second embodiments are applied to a bearing device of a type in which a small-diameter step portion of a hub wheel is caulked in the seventh embodiment of the present invention. 本発明における第八の実施形態で、第三〜第六の実施形態を、ハブ輪の小径段部を加締めたタイプの軸受装置に適用した例を示す縦断面図である。FIG. 14 is a longitudinal sectional view showing an example in which the third to sixth embodiments are applied to a bearing device of a type in which a small-diameter step portion of a hub wheel is caulked in the eighth embodiment of the present invention. 駆動車輪用軸受装置の従来例を示す縦断面図である。It is a longitudinal cross-sectional view which shows the prior art example of the bearing apparatus for drive wheels.

符号の説明Explanation of symbols

１０ 内方部材（ハブ輪）
１２ 内側軌道面
１４ 車輪取付フランジ
２０ａ，２０ｂ 内方部材（内輪）
２２ 内側軌道面
２６ｂ セラミックス部（コーティング膜）
３０，４０ 転動体
５０ 外方部材（外輪）
５２，５４ 外側軌道面
６０ 等速自在継手
６１ 肩部
６２ 外側継手部材
６３ セラミックス部（コーティング膜）
６６ ステム部
８１ セラミックス部（プレート）
８２，８４ セラミックス部（コーティング層） 10 Inner member (hub ring)
12 Inner raceway surface 14 Wheel mounting flange 20a, 20b Inner member (inner ring)
22 Inner raceway surface 26b Ceramic part (coating film)
30, 40 Rolling element 50 Outer member (outer ring)
52, 54 Outer raceway surface 60 Constant velocity universal joint 61 Shoulder part 62 Outer joint member 63 Ceramic part (coating film)
66 Stem part 81 Ceramic part (plate)
82,84 Ceramic part (coating layer)

Claims (8)

内周に複列の外側軌道面が形成された外方部材と、一端に車輪取付フランジを有すると共に外周に複列の内側軌道面を有し、ハブ輪と内輪からなる内方部材と、前記外方部材の外側軌道面と内方部材の内側軌道面との間に介装された複列の転動体とを備え、前記ハブ輪の軸孔に等速自在継手の外側継手部材から延びるステム部をスプライン嵌合させた駆動車輪用軸受装置において、前記外側継手部材の肩部と前記内方部材の端部の対向面間にセラミックス部を介在させたことを特徴とする駆動車輪用軸受装置。   An outer member having a double row outer raceway surface formed on the inner periphery, a wheel mounting flange at one end and a double row inner raceway surface on the outer periphery, and an inner member comprising a hub wheel and an inner ring; A double row rolling element interposed between the outer raceway surface of the outer member and the inner raceway surface of the inner member, and extending from the outer joint member of the constant velocity universal joint to the shaft hole of the hub wheel A drive wheel bearing device in which a portion is spline-fitted, wherein a ceramic portion is interposed between opposing surfaces of a shoulder portion of the outer joint member and an end portion of the inner member. . 前記セラミックス部は、前記外側継手部材の肩部と前記内方部材の端部との対向面のいずれか一方に形成されたコーティング膜で構成されている請求項１に記載の駆動車輪用軸受装置。   2. The drive wheel bearing device according to claim 1, wherein the ceramic portion is formed of a coating film formed on one of opposing surfaces of a shoulder portion of the outer joint member and an end portion of the inner member. . 前記セラミックス部は、前記外側継手部材の肩部と前記内方部材の端部の対向面間に挟み込まれたプレートの端面の少なくとも一方に形成されたコーティング層で構成されている請求項１に記載の駆動車輪用軸受装置。   The said ceramic part is comprised by the coating layer formed in at least one of the end surface of the plate pinched | interposed between the opposing surface of the shoulder part of the said outer joint member, and the edge part of the said inward member. Drive wheel bearing device. 前記プレートは、その素材をステンレス鋼とした請求項３に記載の駆動車輪用軸受装置。   The drive plate bearing device according to claim 3, wherein the plate is made of stainless steel. 前述のプレートを、焼入れした鉄鋼材料とした請求項３に記載の駆動車輪用軸受装置。   The drive wheel bearing device according to claim 3, wherein the plate is made of a hardened steel material. 前記セラミックス部は、前記外側継手部材の肩部と前記内方部材の端部の対向面間に挟み込まれたプレート形状に成形されている請求項１に記載の駆動車輪用軸受装置。   2. The drive wheel bearing device according to claim 1, wherein the ceramic portion is formed into a plate shape sandwiched between opposing surfaces of a shoulder portion of the outer joint member and an end portion of the inner member. 前記内方部材は、ハブ輪の外周面に一対の内輪を嵌合させ、一方の内輪の外周面にアウトボード側の内側軌道面を形成し、他方の内輪の外周面にインボード側の内側軌道面を形成した構造を具備した請求項１〜６のいずれか一項に記載の駆動車輪用軸受装置。   The inner member is formed by fitting a pair of inner rings to the outer peripheral surface of the hub wheel, forming an inner raceway surface on the outboard side on the outer peripheral surface of one inner ring, and an inner side on the inboard side on the outer peripheral surface of the other inner ring. The bearing apparatus for drive wheels as described in any one of Claims 1-6 which comprised the structure which formed the track surface. 前記内方部材は、一方の内側軌道面が形成されたハブ輪の外周面に小径段部を形成し、前記小径段部に他方の内側軌道面が形成された内輪を圧入した上でハブ輪の小径段部の端部を加締めた構造を具備した請求項１〜６のいずれか一項に記載の駆動車輪用軸受装置。   The inner member is formed with a small-diameter stepped portion on the outer peripheral surface of the hub wheel formed with one inner raceway surface, and the inner ring formed with the other inner raceway surface is press-fitted into the hub wheel. The bearing apparatus for drive wheels as described in any one of Claims 1-6 which comprised the structure which crimped the edge part of the small diameter step part.
JP2008142373A 2008-05-30 2008-05-30 Bearing device for driving wheel Withdrawn JP2009286310A (en)

Priority Applications (1)

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Publications (1)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011158793A1 (en) * 2010-06-14 2011-12-22 Ntn株式会社 Vehicle-wheel bearing device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011158793A1 (en) * 2010-06-14 2011-12-22 Ntn株式会社 Vehicle-wheel bearing device

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