JP3985617B2 - Rolling bearing device - Google Patents

Rolling bearing device Download PDF

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Publication number
JP3985617B2
JP3985617B2 JP2002208146A JP2002208146A JP3985617B2 JP 3985617 B2 JP3985617 B2 JP 3985617B2 JP 2002208146 A JP2002208146 A JP 2002208146A JP 2002208146 A JP2002208146 A JP 2002208146A JP 3985617 B2 JP3985617 B2 JP 3985617B2
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Japan
Prior art keywords
ring member
outer ring
cap
peripheral surface
diameter
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Expired - Fee Related
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JP2002208146A
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Japanese (ja)
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JP2004052829A (en
Inventor
照之 脇阪
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JTEKT Corp
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JTEKT Corp
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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
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/723—Shaft end sealing means, e.g. cup-shaped caps or covers
    • 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
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
    • F16C33/783—Details of the sealing or parts thereof, e.g. geometry, material of the mounting region
    • 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
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C41/00—Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
    • F16C41/007—Encoders, e.g. parts with a plurality of alternating magnetic poles

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that since a fitting part of a protective cap is formed into a specific cross-sectional shape in the length direction and surface pressure between the inner peripheral face of an outer ring member and the inner part of the protective cap becomes smaller compared with that between the inner peripheral face of the outer ring member and the front part of the protective cap, it causes muddy water or the like to easily intrude inside a rolling bearing for an axle in a rolling bearing device for an axle. <P>SOLUTION: A maximum diameter D1 at the outer peripheral face end on the vehicle outer side at the fitting part 24 of the protective cap 18 is formed in a tapered shape gradually inclined toward the vehicle outer side so as to become larger in diameter than a diameter D2 on the inner peripheral face of a part 2a to be fitted in the outer ring member 2. By this, after the fitting part 24 is inserted into the part 2a to be fitted of the outer ring member 2, the vehicle outer side part of the fitting part 24 is slightly reduced in diameter; the vehicle outer side part of the fitting part 24 is surely adhered on the inner peripheral face of the outer ring member 2 by the elasticity of resins; an interference is made constant all over the area in the axial direction of the fitting part 24; and as a result, it is possible to secure sealing performance. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、転がり軸受装置に関する。
【０００２】
【従来の技術】
車軸用転がり軸受装置は、車体側に非回転に支持される外輪部材と、この外輪部材の径方向内方に軸心回りに回転自在に配置される内輪部材と、外輪部材と内輪部材との間に転動自在に配置される２列の玉とを備える。内輪部材は、ブレーキディスクおよびタイヤホイールが取付けられるハブ軸と、このハブ軸の車両インナ側に嵌着される環状部材とを備える。
【０００３】
外輪部材の内周面には、各列の玉の内輪軌道面が形成されている。ハブ軸の外周面途中部および環状部材の外周面は、玉の内輪軌道面が形成され、ハブ軸の端部にナットを螺着締結することで、各列の玉に対して所定の予圧が付与される。
【０００４】
外輪部材と内輪部材との間の空間を車両インナ側で覆う保護キャップが、外輪部材の内周面に嵌着されている。この保護キャップは、車軸用転がり軸受の内部に泥水等が浸入するのを防止する機能を有する。またこの保護キャップは、環状部材の外周面に嵌着されるパルサーリングからの出力信号を検出する回転数センサの取付け部材として利用される。
【０００５】
このような保護キャップは、外輪部材に対する嵌合いのために、外輪部材の端部内周面に、軸方向に所定の長さの嵌合部を有する。
【０００６】
【発明が解決しようとする課題】
上記車軸用転がり軸受装置において、保護キャップの嵌合部は、長さ方向に一定の断面形状に形成されている。この場合、保護キャップの奥側部の方が保護キャップの手前側部に比べて、外輪部材の内周面との間の面圧が小さくなる。このことは、泥水等が車軸用転がり軸受の内部に侵入し易くなる要因となる。
【０００７】
【課題を解決するための手段】
本発明における転がり軸受装置は、金属製の外輪部材と、前記外輪部材の径方向内方に同心に配置される内輪部材と、前記外輪部材および内輪部材の間の環状空間に転動自在に配置される複数の転動体と、有底円筒形状に形成されるとともに、前記外輪部材の軸方向一方側端部の内周面に、軸方向他方側端部の外周面が嵌着される樹脂製のキャップとを含み、前記外輪部材のキャップとの嵌合部における内周面の径が、軸方向に同一とされ、前記キャップの外輪部材との嵌合部における軸方向一方側端部の外周面の径が、前記外輪部材のキャップとの嵌合部における内周面の径と同じに形成され、前記キャップの外輪部材との嵌合部における軸方向他方側端部の外周面の径が、前記外輪部材のキャップとの嵌合部における内周面の径より大きくなるよう軸方向他側に向けて順次大径に形成され、前記外輪部材とキャップとの嵌め合いによる面圧が両者の嵌合部の軸方向長さ全域に亙って均一とされている。
【０００８】
上記構成のように、キャップにおける軸方向他方側端部の外周面の径が、外輪部材における軸方向一方側端部の内周面の径より大きくなるよう軸方向他側に向けて順次大径に形成されて、外輪部材の軸方向一方側端部の内周面と、キャップの軸方向他方側端部の外周面とが嵌合されることにより、外輪部材とキャップとの嵌め合いによる面圧、すなわち締め代が両者の嵌合部の軸方向長さ全域に亙ってほぼ均一になり、必要なシール性が確保される。
【０００９】
また、本発明の転がり軸受装置は、金属製の外輪部材と、前記外輪部材の径方向内方に同心に配置される内輪部材と、前記外輪部材および内輪部材の間の環状空間に転動自在に配置される複数の転動体と、有底円筒形状に形成されるとともに、前記外輪部材の軸方向一方側端部の内周面に、軸方向他方側端部の外周面が嵌着される樹脂製のキャップとを含み、前記キャップの外輪部材との嵌合部における外周面の径が、軸方向に同一とされ、前記外輪部材のキャップとの嵌合部における軸方向他方側端部の内周面の径が、前記キャップの外輪部材との嵌合部における外周面の径より小さくなるよう軸方向他方側に向けて順次小径に形成され、前記外輪部材とキャップとの嵌め合いによる面圧が両者の嵌合部の軸方向長さ全域に亙って均一とされている。
【００１０】
この構成においても、上記と同様に、外輪部材とキャップとの嵌め合いによる面圧、すなわち締め代が両者の嵌合部の軸方向長さ全域に亙ってほぼ均一になり、必要なシール性が確保される。
【００１１】
さらに、前記キャップが樹脂製とされている場合、外輪部材の熱膨張率が大きく、キャップの熱膨張率が小さくても、キャップの弾性力によって必要な締め代が確保されて、必要なシール性が確保される。
【００１２】
【発明の実施の形態】
以下本発明の実施形態を図面に基づいて説明する。図１は本発明の実施形態を示す車軸用転がり軸受装置の全体構成を示す断面図、図２は保護キャップを外輪部材に嵌着する前の要部拡大断面図、図３は保護キャップを外輪部材に嵌着する途中の要部拡大断面図である。
【００１３】
まず、図１に基づいて車軸用転がり軸受装置１の全体構成を説明する。この車軸用転がり軸受装置１は、外輪部材２と、この外輪部材２の径方向内方に軸心回りに回転自在に配置される内輪部材３と、外輪部材２と内輪部材３との間に転動自在に配置される転動体としての２列の玉４，５とを備える。
【００１４】
外輪部材２は、例えばＪＩＳ規格Ｓ５５Ｃ、あるいはＳＵＪ２に規定される材質（鋼材）によって円筒状に形成され、その外周面途中には、径方向外向きに突出する固定用フランジ６が形成されている。この固定用フランジ６を介して外輪部材２が車体側に非回転に支持される。外輪部材２の内周面には、各列の玉４，５の内輪軌道面が形成されている。
【００１５】
内輪部材３は、ハブ軸７と、このハブ軸７の車両インナ側に嵌着される環状部材８とを備える。ハブ軸７は、その車両アウタ側位置に、径方向外向きに突出するハブフランジ９を有する。このハブフランジ９に、ブレーキディスク１０およびタイヤホイール１１が重ねて取付けられる。環状部材８は、ハブ軸７の車両インナ側に形成された環状凹部１２に嵌合されている。ハブ軸７の外周面途中部および環状部材８の外周面に、玉４，５の内輪軌道面が形成されている。
【００１６】
ハブ軸７は、環状部材８から車両インナ側に突出する突出部１３を有し、この突出部１３の外周面にねじが形成されている。この突出部１３にナット１４が螺着締結され、これにより、各列の玉４，５に対して所定の予圧が付与されるとともに、ハブ軸７と環状部材８とが軸心回りに回転一体となる。
【００１７】
外輪部材２の車両アウタ側端部とハブフランジ９との間に、環状空間１５をその車両アウタ側で密封するシール部材１６が設けられている。
【００１８】
環状部材８の外周面に、内輪部材３とともに軸心回りに回転するパルサーリング１７が嵌着されている。外輪部材２と内輪部材３との間の空間を車両インナ側で覆う樹脂製の保護キャップ１８が、外輪部材２の内周面嵌着されている。この保護キャップ１８は、車軸用転がり軸受装置１の内部に泥水等が浸入するのを防止して、軸受内部を保護する防水機能を有する。保護キャップ１８の形成材料として、ＰＰＳ樹脂（ポリフェニレンサルファイド）等が好適に用いられる。
【００１９】
またこの保護キャップ１８は、パルサーリング１７からの出力信号を検出する回転数センサの取付け部材として利用される。保護キャップ１８は、円筒部１９と、この円筒部１９の車両インナ側を覆うよう一体的に形成される円盤部２０とを有する。
【００２０】
保護キャップ１８は、円盤部２０に回転数センサ２１の取付け部２２を有する。保護キャップ１８は、円筒部１９の外周面途中に、径方向外向きに突出して外輪部材２の端面に当接するストッパ２３を有する。このストッパ２３から車両アウタ側の円筒部１９が、外輪部材２の車両インナ側端部２ａ（以下被嵌合部２ａという）に嵌合・嵌着する嵌合部２４とされる。この嵌合部２４は、外輪部材２との嵌め合いのために、軸方向に沿って所定の長さＬを有する。
【００２１】
嵌合部２４における車両アウタ側の外周面端の最大径D１は、外輪部材２の被嵌合部２ａにおける内周面の径Ｄ２より大径になるよう車両アウタ側に向けて順次、わずかに傾斜するテーパ状に形成される。また嵌合部２４の隅部には、嵌合部２４を外輪部材２の被嵌合部２ａに挿入内嵌し易いように面取り２４ａが施されている。
【００２２】
上記構成において、外輪部材２に対して玉４，５、内輪部材３を組付け、ナット１４をハブ軸７の端部に螺着する。そしてパルサーリング１７を環状部材８の外周面に嵌着して、次に保護キャップ１８を外輪部材２の被嵌合部２ａに内嵌する。
【００２３】
このとき、嵌合部２４における車両アウタ側の外周面端の最大径D１は、外輪部材２における被嵌合部２ａ内周面の径Ｄ２より大径であるが、嵌合部２４の隅部には、面取り２４ａが施されている。このため、嵌合部２４を外輪部材２の被嵌合部２ａに挿入内嵌し易い。
【００２４】
ところで、一般に、保護キャップ１８の車両アウタ側の方が保護キャップ１８の車両インナ側に比べて、外輪部材２の被嵌合部２ａの内周面との間で面圧が小さくなる。
【００２５】
しかしこの実施形態では、嵌合部２４における車両アウタ側の外周面端の最大径D１は、外輪部材２における被嵌合部２ａ内周面の径Ｄ２より大径になるよう車両アウタ側に向けて順次、わずかに傾斜するテーパ状に形成されている。このため、嵌合部２４を外輪部材２の被嵌合部２ａに挿入して嵌合した後は、嵌合部２４の車両アウタ側部分がテーパを形成した分だけわずかに縮径するようになり、樹脂の弾力によって特に嵌合部２４の車両アウタ側部分は外輪部材２の内周面に確実に密着する。これにより、嵌合部２４の軸方向全域に亙って面圧、すなわち締め代がほぼ一定となる。
【００２６】
従って、嵌合部２４の外周面と、外輪部材２の被嵌合部２ａの内周面との接触によるシール性が、従来に比べて向上し、軸受け内部に泥水等が侵入するのを確実に防止することができる。
【００２７】
さらに、車軸用転がり軸受装置１の使用に伴なって、外輪部材２および保護キャップ１８の温度は上昇する。このとき外輪部材２および保護キャップ１８を形成する材料、すなわち鋼材と樹脂とでは熱膨張率が異なり、鋼材の方が樹脂よりも大きい。
【００２８】
従って、嵌合部２４が長さ全域に亙って同一断面であれば、外輪部材２および保護キャップ１８の温度が上昇した場合、両者の間に隙間が発生し易い。しかし、本発明の実施形態では、嵌合部２４における車両アウタ側の外周面端の最大径D１は、外輪部材２における被嵌合部２ａ端部内周面の径Ｄ２より大径になるよう車両アウタ側に向けて順次、わずかに傾斜するテーパ状に形成され、嵌合部２４の車両アウタ側部分がテーパを形成した分だけわずかに縮径するように弾性変形している。
【００２９】
このため、両者が熱膨張した場合、嵌合部２４の弾性変形が回復することで、嵌合部２４が外輪部材２の被嵌合部２ａに追従し、両者の間に隙間が発生しないようなる。従って、外輪部材２および保護キャップ１８の温度が上昇した場合であっても、両者の嵌め合いが確保され、シール性が確保される。
【００３０】
上記実施形態では、外輪部材２および保護キャップ１８の嵌め合いを確保するために、保護キャップ１８の嵌合部２４に、車両アウタ側に向けて順次、わずかに傾斜するテーパ形状を施したが、本発明はこれに限定されるものではない。
【００３１】
例えば、保護キャップ１８の嵌合部２４は長さ方向全域に亙って同一断面とし、外輪部材２における被嵌合部２ａの内周面のうち、嵌合部２４と嵌合する部分を、車両アウタ側に向けて順次縮径するようなテーパ状に形成するようにしてもよい。
【００３２】
このように構成した場合であっても、外輪部材２の被嵌合部２ａの端部に嵌合部２４を嵌合させた際、嵌合部２４の車両アウタ側がその弾性に抗して縮径して嵌合部２４の全域に亙ってほぼ均一な面圧を確保できる。さらに、両者が熱膨張した場合、嵌合部２４の弾性変形が回復し、両者の間に隙間が発生しないようなる。従って、外輪部材２および保護キャップ１８の温度が上昇した場合であっても、両者の面圧が確保され、シール性が確保される。
【００３３】
【発明の効果】
以上の説明から明らかな通り、本発明によれば、外輪部材とキャップとの嵌合面の嵌め合いによる面圧、すなわち締め代を、嵌合部分の長さ方向全域に亙って確保して、必要なシール性を確保することができる。
【図面の簡単な説明】
【図１】 本発明の実施形態を示す車軸用転がり軸受装置の全体構成を示す断面図である。
【図２】 同じく保護キャップを外輪部材に嵌着する前の要部拡大断面図である。
【図３】 同じく保護キャップを外輪部材に嵌着する途中の要部拡大断面図である。
【符号の説明】
１ 車軸用転がり軸受装置
２ 外輪部材
３ 内輪部材
１８ 保護キャップ
１９ 円筒部
２０ 円盤部
２３ ストッパ
２４ 嵌合部
２４ａ 面取り[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rolling bearing device.
[0002]
[Prior art]
A rolling bearing device for an axle includes an outer ring member that is supported non-rotatingly on the vehicle body side, an inner ring member that is rotatably disposed about a shaft center radially inward of the outer ring member, and an outer ring member and an inner ring member. And two rows of balls arranged so as to roll freely between them. The inner ring member includes a hub shaft to which a brake disk and a tire wheel are attached, and an annular member that is fitted to the vehicle inner side of the hub shaft.
[0003]
Inner ring raceways of balls in each row are formed on the inner circumferential surface of the outer ring member. The inner ring raceway surface of the ball is formed in the middle part of the outer peripheral surface of the hub shaft and the outer peripheral surface of the annular member, and a predetermined preload is applied to the balls in each row by screwing and fastening a nut to the end of the hub shaft. Is granted.
[0004]
A protective cap that covers the space between the outer ring member and the inner ring member on the vehicle inner side is fitted on the inner peripheral surface of the outer ring member. This protective cap has a function of preventing muddy water or the like from entering the inside of the axle rolling bearing. The protective cap is used as a mounting member for a rotation speed sensor that detects an output signal from a pulsar ring that is fitted to the outer peripheral surface of the annular member.
[0005]
Such a protective cap has a fitting portion having a predetermined length in the axial direction on the inner peripheral surface of the end portion of the outer ring member for fitting to the outer ring member.
[0006]
[Problems to be solved by the invention]
In the above-described axle rolling bearing device, the fitting portion of the protective cap is formed in a constant cross-sectional shape in the length direction. In this case, the surface pressure between the inner side surface of the outer ring member is smaller in the rear side portion of the protective cap than in the front side portion of the protective cap. This is a factor that makes it easier for muddy water and the like to enter the axle rolling bearing.
[0007]
[Means for Solving the Problems]
The rolling bearing device according to the present invention is arranged to roll in a metal outer ring member, an inner ring member concentrically arranged radially inward of the outer ring member, and an annular space between the outer ring member and the inner ring member. A plurality of rolling elements formed in a bottomed cylindrical shape, and an outer peripheral surface of the other end portion in the axial direction is fitted to an inner peripheral surface of the one end portion in the axial direction of the outer ring member. The diameter of the inner peripheral surface in the fitting portion with the cap of the outer ring member is the same in the axial direction, and the outer circumference of the one end portion in the axial direction in the fitting portion with the outer ring member of the cap The diameter of the surface is formed to be the same as the diameter of the inner peripheral surface of the fitting portion of the outer ring member with the cap , and the diameter of the outer peripheral surface of the other end portion in the axial direction of the fitting portion of the cap with the outer ring member is , larger than the diameter of the inner peripheral surface that put the fitting portion of the cap of the outer ring member So as formed sequentially larger diameter toward the other axial side, the surface pressure due to fitting between the outer ring member and the cap is uniform over the axial length throughout the engagement portion therebetween.
[0008]
As in the above configuration, the diameter of the outer peripheral surface of the other end portion in the axial direction of the cap is successively increased in diameter toward the other side in the axial direction so as to be larger than the diameter of the inner peripheral surface of the one end portion of the outer ring in the axial direction. A surface formed by fitting the outer ring member and the cap by fitting the inner peripheral surface of the outer ring member on the one end in the axial direction and the outer peripheral surface of the other end in the axial direction of the cap. The pressure, that is, the tightening margin, is almost uniform over the entire axial length of the fitting portion between them, and the necessary sealing performance is ensured.
[0009]
Further, the rolling bearing device of the present invention is rollable in a metal outer ring member, an inner ring member concentrically arranged radially inward of the outer ring member, and an annular space between the outer ring member and the inner ring member. A plurality of rolling elements arranged in a cylindrical shape with a bottom, and an outer peripheral surface of the other end portion in the axial direction is fitted to an inner peripheral surface of the one end portion in the axial direction of the outer ring member. and a resin cap, the diameter of the outer peripheral surface of the fitting portion between the outer race member of the cap, is the same in the axial direction, the opposite axial end portion of the fitting portion of the cap of the outer ring member the diameter of the inner circumferential surface is formed sequentially diameter toward the other side in the axial direction to be smaller than the diameter of the outer circumferential surface that put the fitting portion between the outer race member of the cap, fitted between the outer ring member and the cap The surface pressure due to mating is uniform over the entire axial length of the mating part To have.
[0010]
In this configuration as well, as described above, the surface pressure due to the fitting between the outer ring member and the cap, that is, the tightening margin is almost uniform over the entire axial length of the fitting portion of both, and the necessary sealing performance Is secured.
[0011]
Further, when the cap is made of resin, the outer ring member has a large coefficient of thermal expansion, and even if the coefficient of thermal expansion of the cap is small, the necessary tightening allowance is secured by the elastic force of the cap, and the necessary sealing performance Is secured.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing the overall configuration of an axle rolling bearing device according to an embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view of a main part before the protective cap is fitted to the outer ring member, and FIG. It is a principal part expanded sectional view in the middle of fitting to a member.
[0013]
First, the overall configuration of the axle rolling bearing device 1 will be described with reference to FIG. This axle rolling bearing device 1 includes an outer ring member 2, an inner ring member 3 that is rotatably arranged around the axis center in the radial direction of the outer ring member 2, and an outer ring member 2 and an inner ring member 3. It has two rows of balls 4 and 5 as rolling elements that are arranged to roll freely.
[0014]
The outer ring member 2 is formed in a cylindrical shape by a material (steel material) defined in, for example, JIS standard S55C or SUJ2, and a fixing flange 6 protruding outward in the radial direction is formed in the middle of the outer peripheral surface. . The outer ring member 2 is non-rotatably supported on the vehicle body side via the fixing flange 6. On the inner peripheral surface of the outer ring member 2, inner ring raceway surfaces of the balls 4 and 5 in each row are formed.
[0015]
The inner ring member 3 includes a hub shaft 7 and an annular member 8 fitted to the vehicle inner side of the hub shaft 7. The hub shaft 7 has a hub flange 9 protruding outward in the radial direction at the vehicle outer side position. A brake disc 10 and a tire wheel 11 are attached to the hub flange 9 in an overlapping manner. The annular member 8 is fitted in an annular recess 12 formed on the vehicle inner side of the hub shaft 7. Inner ring raceway surfaces of the balls 4 and 5 are formed in the middle portion of the outer peripheral surface of the hub shaft 7 and the outer peripheral surface of the annular member 8.
[0016]
The hub shaft 7 has a protrusion 13 that protrudes from the annular member 8 toward the vehicle inner side, and a screw is formed on the outer peripheral surface of the protrusion 13. A nut 14 is screwed and fastened to the protruding portion 13, whereby a predetermined preload is applied to the balls 4 and 5 in each row, and the hub shaft 7 and the annular member 8 are integrally rotated around the axis. It becomes.
[0017]
A seal member 16 that seals the annular space 15 on the vehicle outer side is provided between the end portion of the outer ring member 2 on the vehicle outer side and the hub flange 9.
[0018]
A pulsar ring 17 that rotates around the axis together with the inner ring member 3 is fitted to the outer peripheral surface of the annular member 8. A resin-made protective cap 18 that covers the space between the outer ring member 2 and the inner ring member 3 on the vehicle inner side is fitted on the inner peripheral surface of the outer ring member 2. The protective cap 18 has a waterproof function of preventing the muddy water and the like from entering the inside of the axle rolling bearing device 1 and protecting the inside of the bearing. As a material of the protective cap 18, PPS resin (polyphenylene service Rufaido) or the like is preferably used.
[0019]
The protective cap 18 is used as an attachment member for a rotation speed sensor that detects an output signal from the pulsar ring 17. The protective cap 18 includes a cylindrical portion 19 and a disk portion 20 that is integrally formed so as to cover the vehicle inner side of the cylindrical portion 19.
[0020]
The protective cap 18 has a mounting portion 22 for the rotation speed sensor 21 in the disk portion 20. The protective cap 18 has a stopper 23 that protrudes radially outward and contacts the end surface of the outer ring member 2 in the middle of the outer peripheral surface of the cylindrical portion 19. The cylindrical portion 19 on the vehicle outer side from the stopper 23 serves as a fitting portion 24 that fits and fits on the vehicle inner side end portion 2a (hereinafter referred to as the fitted portion 2a) of the outer ring member 2. The fitting portion 24 has a predetermined length L along the axial direction for fitting with the outer ring member 2.
[0021]
The maximum diameter D1 of the outer peripheral surface end on the vehicle outer side in the fitting portion 24 is gradually increased slightly toward the vehicle outer side so as to be larger than the diameter D2 of the inner peripheral surface in the fitted portion 2a of the outer ring member 2. It is formed in an inclined taper shape. Further, a chamfer 24 a is provided at a corner of the fitting portion 24 so that the fitting portion 24 can be easily inserted and fitted into the fitted portion 2 a of the outer ring member 2.
[0022]
In the above configuration, the balls 4 and 5 and the inner ring member 3 are assembled to the outer ring member 2, and the nut 14 is screwed to the end of the hub shaft 7. Then, the pulsar ring 17 is fitted on the outer peripheral surface of the annular member 8, and then the protective cap 18 is fitted inside the fitted portion 2 a of the outer ring member 2.
[0023]
At this time, the maximum diameter D1 of the outer peripheral surface end on the vehicle outer side in the fitting portion 24 is larger than the diameter D2 of the inner peripheral surface of the fitted portion 2a in the outer ring member 2, but the corner portion of the fitting portion 24 Is chamfered 24a. For this reason, it is easy to insert and fit the fitting portion 24 into the fitted portion 2 a of the outer ring member 2.
[0024]
By the way, generally, the surface pressure on the vehicle outer side of the protective cap 18 is smaller between the inner peripheral surface of the fitted portion 2a of the outer ring member 2 than the vehicle inner side of the protective cap 18.
[0025]
However, in this embodiment, the maximum diameter D1 of the outer peripheral surface end on the vehicle outer side in the fitting portion 24 is directed toward the vehicle outer side so as to be larger than the diameter D2 of the inner peripheral surface of the fitted portion 2a in the outer ring member 2. Are formed in a tapered shape that is slightly inclined. For this reason, after the fitting part 24 is inserted into the fitted part 2a of the outer ring member 2 and fitted, the diameter of the fitting part 24 is slightly reduced by the amount of taper. Therefore, the vehicle outer side portion of the fitting portion 24 is particularly in close contact with the inner peripheral surface of the outer ring member 2 due to the elasticity of the resin. As a result, the surface pressure, that is, the tightening margin, is substantially constant over the entire axial direction of the fitting portion 24.
[0026]
Therefore, the sealing performance by the contact between the outer peripheral surface of the fitting portion 24 and the inner peripheral surface of the fitted portion 2a of the outer ring member 2 is improved as compared with the conventional case, and it is ensured that muddy water or the like enters the bearing. Can be prevented.
[0027]
Furthermore, the temperature of the outer ring member 2 and the protective cap 18 increases with the use of the axle rolling bearing device 1. At this time, the material forming the outer ring member 2 and the protective cap 18, that is, the steel material and the resin have different coefficients of thermal expansion, and the steel material is larger than the resin.
[0028]
Therefore, if the fitting part 24 is the same cross section over the whole length, when the temperature of the outer ring member 2 and the protective cap 18 rises, a gap is easily generated between them. However, in the embodiment of the present invention, the maximum diameter D1 of the outer peripheral surface end on the vehicle outer side of the fitting portion 24 is larger than the diameter D2 of the inner peripheral surface of the fitted portion 2a end portion of the outer ring member 2. It is formed in a taper shape that is slightly inclined sequentially toward the outer side, and the vehicle outer side portion of the fitting portion 24 is elastically deformed so as to be slightly reduced in diameter by the amount of taper.
[0029]
For this reason, when both are thermally expanded, the elastic deformation of the fitting portion 24 is recovered, so that the fitting portion 24 follows the fitted portion 2a of the outer ring member 2 so that no gap is generated therebetween. Become. Therefore, even when the temperature of the outer ring member 2 and the protective cap 18 rises, the fitting between the two is ensured and the sealing performance is ensured.
[0030]
In the above embodiment, in order to secure the fitting of the outer ring member 2 and the protective cap 18, the fitting portion 24 of the protective cap 18 has a tapered shape that is slightly inclined sequentially toward the vehicle outer side. The present invention is not limited to this.
[0031]
For example, the fitting portion 24 of the protective cap 18 has the same cross-section over the entire length direction, and the portion of the inner peripheral surface of the fitted portion 2a of the outer ring member 2 that is fitted with the fitting portion 24 is You may make it form in the taper shape which diameter-reduces sequentially toward a vehicle outer side.
[0032]
Even in this case, when the fitting portion 24 is fitted to the end portion of the fitted portion 2a of the outer ring member 2, the vehicle outer side of the fitting portion 24 contracts against its elasticity. It is possible to ensure a substantially uniform surface pressure over the entire area of the fitting portion 24. Furthermore, when both are thermally expanded, the elastic deformation of the fitting portion 24 is recovered, and no gap is generated between them. Therefore, even if the temperature of the outer ring member 2 and the protective cap 18 rises, the surface pressure of both is ensured and the sealing performance is ensured.
[0033]
【The invention's effect】
As is clear from the above description, according to the present invention, the surface pressure due to the fitting of the fitting surface between the outer ring member and the cap, i.e., the tightening margin, is secured over the entire length direction of the fitting portion. The necessary sealing performance can be ensured.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing the overall configuration of an axle rolling bearing device according to an embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view of a main part before the protective cap is similarly fitted to the outer ring member.
FIG. 3 is an enlarged cross-sectional view of a main part in the middle of fitting the protective cap to the outer ring member.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rolling bearing apparatus for axles 2 Outer ring member 3 Inner ring member 18 Protective cap 19 Cylindrical part 20 Disk part 23 Stopper 24 Fitting part 24a Chamfering

Claims (2)

金属製の外輪部材と、前記外輪部材の径方向内方に同心に配置される内輪部材と、前記外輪部材および内輪部材の間の環状空間に転動自在に配置される複数の転動体と、有底円筒形状に形成されるとともに、前記外輪部材の軸方向一方側端部の内周面に、軸方向他方側端部の外周面が嵌着される樹脂製のキャップとを含み、
前記外輪部材のキャップとの嵌合部における内周面の径が、軸方向に同一とされ、
前記キャップの外輪部材との嵌合部における軸方向一方側端部の外周面の径が、前記外輪部材のキャップとの嵌合部における内周面の径と同じに形成され、
前記キャップの外輪部材との嵌合部における軸方向他方側端部の外周面の径が、前記外輪部材のキャップとの嵌合部における内周面の径より大きくなるよう軸方向他側に向けて順次大径に形成され、
前記外輪部材とキャップとの嵌め合いによる面圧が両者の嵌合部の軸方向長さ全域に亘って均一とされている、転がり軸受装置。A metal outer ring member, an inner ring member that is concentrically arranged radially inward of the outer ring member, and a plurality of rolling elements that are rotatably disposed in an annular space between the outer ring member and the inner ring member; A resin-made cap that is formed in a bottomed cylindrical shape and is fitted to the inner peripheral surface of the one end portion in the axial direction of the outer ring member, and the outer peripheral surface of the other end portion in the axial direction;
The diameter of the inner peripheral surface of the fitting portion with the cap of the outer ring member is the same in the axial direction,
The diameter of the outer peripheral surface of the one end portion in the axial direction in the fitting portion with the outer ring member of the cap is formed to be the same as the diameter of the inner peripheral surface of the fitting portion with the cap of the outer ring member,
Diameter of the outer circumferential surface of the other axial end portion of the fitting portion between the outer ring member of said cap, the other axial side to be larger than the diameter of the inner peripheral surface that put the fitting portion of the cap of the outer ring member formed sequentially larger diameter towards,
A rolling bearing device in which the surface pressure due to the fitting between the outer ring member and the cap is uniform over the entire length in the axial direction of the fitting portion . 金属製の外輪部材と、前記外輪部材の径方向内方に同心に配置される内輪部材と、前記外輪部材および内輪部材の間の環状空間に転動自在に配置される複数の転動体と、有底円筒形状に形成されるとともに、前記外輪部材の軸方向一方側端部の内周面に、軸方向他方側端部の外周面が嵌着される樹脂製のキャップとを含み、
前記キャップの外輪部材との嵌合部における外周面の径が、軸方向に同一とされ、
前記外輪部材のキャップとの嵌合部における軸方向他方側端部の内周面の径が、前記キャップの外輪部材との嵌合部における外周面の径より小さくなるよう軸方向他方側に向けて順次小径に形成され、
前記外輪部材とキャップとの嵌め合いによる面圧が両者の嵌合部の軸方向長さ全域に亙って均一とされている、転がり軸受装置。A metal outer ring member, an inner ring member that is concentrically arranged radially inward of the outer ring member, and a plurality of rolling elements that are rotatably disposed in an annular space between the outer ring member and the inner ring member; A resin-made cap that is formed in a bottomed cylindrical shape and is fitted to the inner peripheral surface of the one end portion in the axial direction of the outer ring member, and the outer peripheral surface of the other end portion in the axial direction;
The diameter of the outer peripheral surface in the fitting portion with the outer ring member of the cap is the same in the axial direction,
The diameter of the inner peripheral surface of the other axial end portion of the fitting portion of the cap of the outer ring member, the other axial to be smaller than the diameter of the outer circumferential surface that put the fitting portion between the outer race member of the cap It is formed in small diameters sequentially toward the side,
A rolling bearing device in which the surface pressure due to the fitting between the outer ring member and the cap is uniform over the entire axial length of the fitting portion .
JP2002208146A 2002-07-17 2002-07-17 Rolling bearing device Expired - Fee Related JP3985617B2 (en)

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