JP3988576B2 - Rolling bearing device - Google Patents

Rolling bearing device Download PDF

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Publication number
JP3988576B2
JP3988576B2 JP2002233381A JP2002233381A JP3988576B2 JP 3988576 B2 JP3988576 B2 JP 3988576B2 JP 2002233381 A JP2002233381 A JP 2002233381A JP 2002233381 A JP2002233381 A JP 2002233381A JP 3988576 B2 JP3988576 B2 JP 3988576B2
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Japan
Prior art keywords
ring member
outer ring
protective cap
cap
rolling bearing
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JP2002233381A
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JP2004076753A (en
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順司 村田
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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
    • 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
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem of becoming a factor of intruding muddy water inside a rolling bearing for a wheel shaft for easily generating clearance between an outer race member and a protective cap since a linear expansion coefficient is different between the metallic outer race member and the resin protective cap when a temperature of the outer race member and the protective cap rises according to use in a rolling bearing device for the wheel shaft. <P>SOLUTION: When the temperature rises according to use of the rolling bearing device 1, since a thermal expansion coefficient is different between metal and resin, a little clearance is occasionally generated between an inner peripheral surface 2b of an outer race side fitting part 2a in the outer race member 2 and an outer peripheral surface 25 of a protective cap side fitting part 23 in the protective cap 18, and since one strip of annular recessed part 26 is formed in the middle of the shaft direction in an outer peripheral surface 25a of a cylindrical part 25, the recessed part 26 has the labyrinth function and secures required sealing performance, and can prevent the muddy water from intruding from an opposed surface between a side surface 27a of a contact part 27 and a vehicle inner side end surface 2c of the outer race side fitting part 2a. <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、コストの低減のために保護キャップを樹脂製とする場合がある。
【０００７】
ところで、車軸用転がり軸受装置では、その使用に伴って外輪部材、保護キャップの温度が上昇する。そして金属製の外輪部材と樹脂製の保護キャップとでは熱膨張率（線膨張係数）が異なるため、外輪部材と保護キャップとの間に隙間が発生しやすい。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。
【０００８】
【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、前記外輪部材と内輪部材との間の環状空間に配置される転動部材と、前記外輪部材の軸方向一方側に嵌着する有底円筒形状のキャップとを含み、前記外輪部材の軸方向一方側端部および前記キャップの軸方向他方側端部に、互いに径方向で対向して嵌着する円筒形状の嵌着部が軸方向に沿って所定長さ設けられ、前記キャップが樹脂製とされ、前記外輪部材の嵌着部の内周面に、前記キャップの嵌着の内周面に、前記キャップの嵌着部が所定の締代をもって内嵌するように嵌着され、前記キャップの嵌着部の外周面における軸方向途中位置に円周方向に沿う環状凹部が形成され、前記キャップの嵌着部の下部に、前記環状凹部と前記キャップの外部とを連通する連通路が形成されている。
【０００９】
この構成によれば、環状凹部がラビリンス機能を果たすので、例えば外輪部材とキャップの嵌合部分から泥水等が浸入しにくく、仮にわずかな隙間が発生した場合であっても、軸受内部に泥水等が浸入するのを防止する。
外輪部材が金属製でキャップが樹脂製であるので、両者の熱膨張率の違いによって外輪部材とキャップの嵌合部分にわずかな隙間が発生した場合でも、環状凹部がラビリンス機能を果たし、軸受内部に泥水等が浸入するのを防止する。
また、仮に環状凹部に泥水等が浸入した場合に、連通路から泥水等が排水されるので、軸受内部に泥水等が浸入するのを防止する。
【００１４】
【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は保護キャップの単体斜視図である。
【００１５】
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部材としての２列の玉４，５とを備える。
【００１６】
外輪部材２は、好適には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の外輪軌道面が形成されている。
【００１７】
内輪部材３は、ハブ軸７を有する。ハブ軸７は、その車両アウタ側（軸心方向一方側であって、図１における左側）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。内輪部材３は、ハブ軸７の車両インナ側に嵌着される環状部材８を有する。ハブフランジ９に、仮想線で示されるブレーキディスク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。
【００１８】
ハブ軸７は、環状部材８から車両インナ側（軸方向他方側であって、図１における右側）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。
【００１９】
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。
【００２０】
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の内周面に嵌着されている。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。
【００２１】
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２１の取付け部材として利用される。すなわち保護キャップ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、外輪部材２における車両インナ側端部の円筒状の外輪側嵌着部２ａに嵌着する保護キャップ側嵌着部２３とから、前記樹脂により一体に形成される。
【００２２】
この保護キャップ側嵌着部２３は、外輪部材２の外輪側嵌着部２ａとの嵌め合いのために、軸方向に沿って所定の長さを有する。
【００２３】
保護キャップ側嵌着部２３は、円筒部１９の車両アウタ側先端部に配置されており、前記外輪部材２の外輪側嵌着部２ａの内周面２ｂに所定の締代でもって嵌合する筒状部２５と、外輪側嵌着部２ａの端面２ｃに軸方向で対向する環状の接触部２７とを有する。
【００２４】
筒状部２５の外周面２５ａは、外輪部材２における外輪側嵌着部２ａの内周面２ｂと径方向で対向して嵌合する部分である。この外周面２５ａにおける軸方向途中位置に、周方向に沿って、一条の環状の凹部２６が形成されている。なお、接触部２７の側面２７ａと外輪部材２の外輪側嵌着部２ａの車両インナ側端面２ｃとが軸方向に対向して接触している。
【００２５】
嵌着部２７の下部に、凹部２６と外輪部材２と保護キャップ１８とで囲まれる空間の外側とを連通する連通路３０が形成されている。この連通路３０は、接触部２７の側面２７ａの一部を径方向に切除することで凹部２６に連通するよう形成されている。
上記構成において、外輪側嵌着部２ａの内周面２ｂに、保護キャップ側嵌着部２３の外周面２５が所定の締代をもって嵌着するよう、また保護キャップ側嵌着部２３における接触部２７の側面２７ａと、外輪側嵌着部２ａにおける車両インナ側端面２ｃとが軸方向に対向して接触するよう、外輪側嵌着部２ａに対して保護キャップ側嵌着部２３を軸方向から嵌着する。これにより外輪部材２の開放側が保護キャップ１８によって覆われて保護され、転がり軸受装置１の使用中に、泥水等が転がり軸受装置１にかかったとしても、泥水等が内部に侵入するのが防止できる。
【００２６】
ところで、転がり軸受装置１の使用に伴って、転がり軸受装置１の温度が上昇した場合、金属と樹脂とでは、熱膨張率（線膨張係数）が異なるため、外輪側嵌着部２ａの内周面２ｂと、保護キャップ側嵌着部２３の外周面２５との間にわずかな隙間が発生した状態となることがある。
【００２７】
しかし、筒状部２５の外周面２５ａにおける軸方向途中位置に、周方向に沿って、一条の環状の凹部２６が形成されているので、この凹部２６がラビリンス機能を有することで必要なシール性を確保して、保護キャップ側嵌着部２３における接触部２７の側面２７ａと、外輪側嵌着部２ａにおける車両インナ側端面２ｃとの対向面から泥水等が侵入するのを防止できる。
【００２８】
さらに、仮に凹部２６に泥水等が侵入した場合、嵌着部２７の下部に、凹部２６と連通路３０とが形成されており、この連通路３０は、接触部２７の側面２７ａの一部を径方向に切除することで凹部２６に連通するよう形成されているので、泥水等が連通路３０から軸受外部に排出されることになる。
【００２９】
なお、凹部２６のラビリンスとしての機能は、温度上昇によって保護キャップ側嵌着部２３の外周面２５との間にわずかな隙間が発生した状態にのみ有効なものではなく、未だ転がり軸受装置１の温度が所定の値まで上昇していない場合にも勿論有効に機能するものである。
【００３０】
これにより軸受内部に泥水等が侵入するのを防止して、転がり軸受装置１の寿命を延長させることができる。
【００３１】
【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の線膨張係数が異なっていたとしても、必要なシール性を確保して、軸受内部への泥水等の侵入を防止できる。
【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の全体構成を示す斜視図である。
【符号の説明】
１ 車軸用転がり軸受装置
２ 外輪部材
２ｂ 外輪部材の端面
３ 内輪部材
１８ 保護キャップ
２６ 環状の凹部[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 middle part of the outer peripheral surface of the hub shaft and the outer peripheral surface of the annular member are formed with an inner raceway surface of the ball, 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 axle rolling bearing device, the protective cap may be made of resin for cost reduction.
[0007]
By the way, in the rolling bearing device for axles, the temperature of an outer ring member and a protective cap rises with the use. Since the metal outer ring member and the resin protective cap have different coefficients of thermal expansion (linear expansion coefficient), a gap is likely to occur between the outer ring member and the protective cap. This is a factor that makes it easier for muddy water and the like to enter the axle rolling bearing.
[0008]
[Means for Solving the Problems]
The rolling bearing device according to the present invention includes a metal outer ring member, an inner ring member disposed concentrically inward in the radial direction of the outer ring member, and a ring space disposed between the outer ring member and the inner ring member. A moving member and a bottomed cylindrical cap fitted on one side in the axial direction of the outer ring member, and each of the outer ring member and the cap on the other side end in the axial direction has a diameter. Cylindrical fitting portions that are fitted opposite to each other in a direction are provided with a predetermined length along the axial direction, the cap is made of resin, and an inner peripheral surface of the fitting portion of the outer ring member The cap is fitted on the inner circumferential surface of the fitting so that the fitting portion of the cap is fitted with a predetermined tightening allowance, and is annular in the circumferential direction at an intermediate position in the axial direction on the outer circumferential surface of the fitting portion of the cap. A recess is formed, and the annular recess is formed below the fitting portion of the cap. Communicating path which communicates the outside of the cap is formed with.
[0009]
According to this configuration, since the annular concave portion performs a labyrinth function, for example, muddy water or the like is difficult to enter from the fitting portion of the outer ring member and the cap, and even if a slight gap is generated, To prevent infiltration .
Since the outer ring member is made of metal and the cap is made of resin, even if a slight gap occurs in the fitting part between the outer ring member and the cap due to the difference in thermal expansion coefficient between them, the annular recess serves as the labyrinth function, Prevents muddy water from entering.
In addition, if muddy water or the like enters the annular recess, the muddy water or the like is drained from the communication path, so that muddy water or the like is prevented from entering the bearing.
[0014]
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 an overall configuration of an axle rolling bearing device according to an embodiment of the present invention, and FIG. 2 is a single perspective view of a protective cap.
[0015]
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 members that are arranged to roll freely.
[0016]
The outer ring member 2 is preferably formed in a cylindrical shape by a material (steel material) defined in JIS standard S55C or SUJ2, and a fixing flange 6 protruding radially outward is formed in the middle of the outer peripheral surface. ing. 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, outer ring raceway surfaces of the balls 4 and 5 in each row are formed.
[0017]
The inner ring member 3 has a hub shaft 7. The hub shaft 7 has a hub flange 9 projecting radially outward at a position on the vehicle outer side (one side in the axial direction and the left side in FIG. 1). The inner ring member 3 includes an annular member 8 that is fitted to the vehicle inner side of the hub axle 7. A brake disc 10 and a tire wheel 11 indicated by phantom lines are attached to the hub flange 9 so as to overlap each other. 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.
[0018]
The hub shaft 7 has a protruding portion 13 that protrudes from the annular member 8 toward the vehicle inner side (the other side in the axial direction and the right side in FIG. 1), and a screw is formed on the outer peripheral surface of the protruding portion 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.
[0019]
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.
[0020]
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 protective cap 18 made of resin that covers the space between the outer ring member 2 and the inner ring member 3 on the vehicle inner side is fitted to 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.
[0021]
The protective cap 18 is used as an attachment member for the rotation speed sensor 21 that detects an output signal from the pulsar ring 17. That is, the protective cap 18 has a mounting portion 22 for the rotation speed sensor 21 in the disk portion 20. The protective cap 18 includes a cylindrical portion 19, a disk portion 20 that is integrally formed so as to cover the vehicle inner side of the cylindrical portion 19, and a cylindrical outer ring side fitting portion at a vehicle inner side end portion of the outer ring member 2. From the protective cap side fitting part 23 fitted to 2a, it forms integrally with the said resin.
[0022]
The protective cap side fitting portion 23 has a predetermined length along the axial direction for fitting with the outer ring side fitting portion 2 a of the outer ring member 2.
[0023]
The protective cap side fitting portion 23 is disposed at the vehicle outer side front end portion of the cylindrical portion 19 and is fitted to the inner peripheral surface 2b of the outer ring side fitting portion 2a of the outer ring member 2 with a predetermined tightening allowance. It has the cylindrical part 25 and the cyclic | annular contact part 27 which opposes the end surface 2c of the outer ring | wheel side fitting part 2a in an axial direction.
[0024]
The outer peripheral surface 25a of the cylindrical portion 25 is a portion that engages with the inner peripheral surface 2b of the outer ring side fitting portion 2a of the outer ring member 2 so as to face each other in the radial direction. A single annular recess 26 is formed along the circumferential direction at a position in the axial direction of the outer circumferential surface 25a. The side surface 27a of the contact portion 27 and the vehicle inner side end surface 2c of the outer ring side fitting portion 2a of the outer ring member 2 are in contact with each other in the axial direction.
[0025]
A communication passage 30 that communicates with the outside of the space surrounded by the recess 26, the outer ring member 2, and the protective cap 18 is formed below the fitting portion 27. The communication passage 30 is formed so as to communicate with the recess 26 by cutting away a part of the side surface 27a of the contact portion 27 in the radial direction.
In the above configuration, the outer peripheral surface 25 of the protective cap side fitting portion 23 is fitted to the inner peripheral surface 2b of the outer ring side fitting portion 2a with a predetermined tightening margin, and the contact portion in the protective cap side fitting portion 23 is used. 27 and the inner side end face 2c of the outer ring side fitting portion 2a are opposed to each other in the axial direction so that the protective cap side fitting portion 23 is moved from the axial direction to the outer ring side fitting portion 2a. Fit. Thereby, the open side of the outer ring member 2 is covered and protected by the protective cap 18, and even when muddy water or the like is applied to the rolling bearing device 1 during use of the rolling bearing device 1, the muddy water or the like is prevented from entering the inside. it can.
[0026]
By the way, when the temperature of the rolling bearing device 1 rises with the use of the rolling bearing device 1, the coefficient of thermal expansion (linear expansion coefficient) differs between the metal and the resin, so the inner circumference of the outer ring side fitting portion 2a. A slight gap may occur between the surface 2b and the outer peripheral surface 25 of the protective cap side fitting portion 23.
[0027]
However, since a single annular recess 26 is formed along the circumferential direction at a position in the axial direction on the outer peripheral surface 25a of the cylindrical portion 25, the sealing performance required by the recess 26 having a labyrinth function. Can be secured, and muddy water or the like can be prevented from entering from the facing surface between the side surface 27a of the contact portion 27 in the protective cap side fitting portion 23 and the vehicle inner side end surface 2c in the outer ring side fitting portion 2a.
[0028]
Furthermore, if muddy water or the like enters the recess 26, the recess 26 and the communication path 30 are formed in the lower part of the fitting part 27, and this communication path 30 is formed by connecting a part of the side surface 27 a of the contact part 27. Since it is formed so as to communicate with the recess 26 by cutting in the radial direction, muddy water or the like is discharged from the communication passage 30 to the outside of the bearing.
[0029]
The labyrinth function of the recess 26 is not effective only in a state where a slight gap is generated between the protective cap side fitting portion 23 and the outer peripheral surface 25 due to a temperature rise. Of course, it functions effectively even when the temperature does not rise to a predetermined value.
[0030]
Thereby, muddy water etc. can be prevented from entering the inside of the bearing, and the life of the rolling bearing device 1 can be extended.
[0031]
【The invention's effect】
As is apparent from the above description, according to the present invention, even if the linear expansion coefficients of the outer ring member and the cap are different, necessary sealing properties can be ensured and muddy water or the like can be prevented from entering the bearing.
[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 a perspective view showing the overall configuration of the protective cap.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rolling bearing apparatus for axles 2 Outer ring member 2b End surface of outer ring member 3 Inner ring member 18 Protective cap 26 Annular recess

Claims (1)

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、前記外輪部材と内輪部材との間の環状空間に配置される転動部材と、前記外輪部材の軸方向一方側に嵌着する有底円筒形状のキャップとを含み、前記外輪部材の軸方向一方側端部および前記キャップの軸方向他方側端部に、互いに径方向で対向して嵌着する円筒形状の嵌着部が軸方向に沿って所定長さ設けられ、
前記キャップが樹脂製とされ、前記外輪部材の嵌着部の内周面に、前記キャップの嵌着の内周面に、前記キャップの嵌着部が所定の締代をもって内嵌するように嵌着され、前記キャップの嵌着部の外周面における軸方向途中位置に円周方向に沿う環状凹部が形成され、
前記キャップの嵌着部の下部に、前記環状凹部と前記キャップの外部とを連通する連通路が形成された、転がり軸受。A metal outer ring member, an inner ring member concentrically disposed radially inward of the outer ring member, a rolling member disposed in an annular space between the outer ring member and the inner ring member, and the outer ring member And a bottomed cylindrical cap that fits on one side in the axial direction, and is fitted to the one end in the axial direction of the outer ring member and the other end in the axial direction of the cap so as to face each other in the radial direction. A cylindrical fitting portion is provided for a predetermined length along the axial direction,
The cap is made of resin, and is fitted on the inner circumferential surface of the fitting portion of the outer ring member so that the fitting portion of the cap is fitted with a predetermined allowance on the inner circumferential surface of the fitting of the cap. Attached, an annular recess along the circumferential direction is formed at an intermediate position in the axial direction on the outer peripheral surface of the fitting portion of the cap,
A rolling bearing in which a communication path that connects the annular recess and the outside of the cap is formed at a lower portion of the fitting portion of the cap .
JP2002233381A 2002-08-09 2002-08-09 Rolling bearing device Expired - Fee Related JP3988576B2 (en)

Priority Applications (1)

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CN100549697C (en) * 2003-10-14 2009-10-14 日本精工株式会社 The hub unit that is used for driving wheel
CA2536190A1 (en) 2005-02-21 2006-08-21 Jtekt Corporation Roller bearing apparatus, method of producing roller bearing apparatus and cover attached to roller bearing apparatus
JP4692879B2 (en) * 2005-07-22 2011-06-01 株式会社ジェイテクト Hub unit
JP5158664B2 (en) * 2006-03-06 2013-03-06 Ｎｔｎ株式会社 Wheel bearing device
DE112008001568T5 (en) 2007-06-19 2010-08-12 Ntn Corp. A wheel bearing device connected to a wheel speed detecting device
JP5193562B2 (en) * 2007-10-26 2013-05-08 Ｎｔｎ株式会社 Wheel bearing device with rotation speed detector
JP5325064B2 (en) * 2009-09-29 2013-10-23 ダイハツ工業株式会社 Wheel support device
JP5979775B2 (en) 2012-02-10 2016-08-31 内山工業株式会社 Cap for bearing device

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