JP2004076784A - Rolling bearing with sealing device - Google Patents

Rolling bearing with sealing device Download PDF

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Publication number
JP2004076784A
JP2004076784A JP2002234529A JP2002234529A JP2004076784A JP 2004076784 A JP2004076784 A JP 2004076784A JP 2002234529 A JP2002234529 A JP 2002234529A JP 2002234529 A JP2002234529 A JP 2002234529A JP 2004076784 A JP2004076784 A JP 2004076784A
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JP
Japan
Prior art keywords
peripheral surface
race
cylindrical portion
sealing device
ring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2002234529A
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Japanese (ja)
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JP2004076784A5 (en
Inventor
Takahiko Uchiyama
内山　貴彦
Keisuke Yokoyama
横山　景介
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NSK Ltd
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NSK Ltd
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Priority to JP2002234529A priority Critical patent/JP2004076784A/en
Publication of JP2004076784A publication Critical patent/JP2004076784A/en
Publication of JP2004076784A5 publication Critical patent/JP2004076784A5/ja
Pending legal-status Critical Current

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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
    • F16C33/76—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
    • 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
    • F16C33/7869—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward
    • F16C33/7873—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a single sealing ring of generally L-shaped cross-section
    • F16C33/7876—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a single sealing ring of generally L-shaped cross-section with sealing lips
    • 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
    • F16C33/7869—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward
    • F16C33/7879—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a further sealing ring
    • F16C33/7883—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a further sealing ring mounted to the inner race and of generally L-shape, the two sealing rings defining a sealing with box-shaped cross-section
    • 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
    • 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
    • F16C2326/00—Articles relating to transporting
    • F16C2326/01—Parts of vehicles in general
    • F16C2326/02—Wheel hubs or castors

Landscapes

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

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing with a sealing device, effectively preventing the entry of water such as rainwater, muddy water or washing water into the rolling bearing even when used under severe circumstances of exposure to rainwater, muddy water or washing water. <P>SOLUTION: A fastening allowance between the outer periphery face of an outer diameter side cylindrical portion 17 of a core metal 14 constituting the sealing device 12a and the inner periphery face of an outer ring internally fitting and fixing the outer diameter side cylindrical portion 17 is 0.05-0.45% of the inner diameter of the inner periphery face of the outer ring. As a result, proper sealing performance of a fitting portion between the outer periphery face of the outer diameter side cylindrical portion 17 of the core metal 14 and the inner periphery face of the outer ring is secured to prevent the entry of water such as rainwater, muddy water or washing water. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、例えば車両（自動車）の車輪を懸架装置に支持する為の自動車用ハブユニット等のシール装置付転がり軸受の改良に関する。特に本発明は、雨水、泥水、洗浄水等に曝されると言った厳しい環境下で使用される場合でも、この様な雨水、泥水、洗浄水等の水分が転がり軸受内に浸入するのを防止して、シール装置付転がり軸受の耐久性の確保を図るものである。
【０００２】
【従来の技術】
例えば、自動車の車輪を懸架装置に支持する為に、自動車用ハブユニットを使用する。この様な本発明の対象となるシール装置付転がり軸受である自動車用ハブユニットの１例を、本発明の実施の形態の１例を示す図１を用いて説明する。この図１は、独立式の懸架装置に支持する駆動輪（ＦＦ車の前輪、ＦＲ車及びＲＲ車の後輪、４ＷＤ車の全輪）用の自動車用ハブユニットの１例を示している。炭素鋼（Ｓ５３ＣＧ）に高周波焼き入れ処理を施す事により造られた、外輪相当部材である外輪１は、外周面に形成した取付部２により、懸架装置に支持固定されて、使用時にも回転しない。この様な固定側軌道輪である外輪１の内径側には、回転側軌道輪となる内輪相当部材３を、この外輪１と同心に設け、使用時にこの内輪相当部材３が回転する様にしている。この内輪相当部材３は、炭素鋼（Ｓ５３ＣＧ）に高周波焼き入れ処理を施す事により造られたハブ４と、軸受鋼（ＳＵＪ２）に焼き入れ処理を施す事により造られた内輪５とから成る。このうちのハブ４の中心部にはスプライン孔６を、外端（車両への組み付け時に幅方向外側になる端を言い、図１の左端）部外周面には取付フランジ７を、それぞれ形成している。車両への組み付け時に上記スプライン孔６には、図示しない等速ジョイントに付属したスプライン軸を挿入し、上記取付フランジ７には車輪を固定する。
【０００３】
又、上記外輪１の内周面に複列の外輪軌道８、８を、上記ハブ４の中間部外周面と上記内輪５の外周面とに内輪軌道９、９を、それぞれ形成している。そして、これら各外輪軌道８、８と内輪軌道９、９との間に転動体１０、１０を、それぞれ複数個ずつ設けて、上記外輪１の内側での内輪相当部材３の回転を自在としている。尚、上記各転動体１０、１０は、それぞれ保持器１１、１１により、転動自在に保持している。又、図示の例では転動体１０、１０として玉を使用しているが、重量が嵩む車両用の軸受の場合には、転動体としてテーパころを使用する場合もある。更に、上記外輪１の内端部内周面と上記内輪５の内端部外周面との間、並びに、この外輪１の外端部内周面と上記ハブ４の中間部外周面との間に、それぞれシール装置１２ａ、１２ｂを設け、上記外輪１の内周面と上記内輪相当部材３の外周面との間で、上記各転動体１０、１０を設置した空間１３の両端開口を塞いでいる。
【０００４】
上記両シール装置１２ａ、１２ｂは、それぞれ図２〜３に示す様に構成している。先ず、上記空間１３の内端（車両への組み付け時に幅方向中央側になる端を言い、図１の右端）開口部を塞ぐシール装置１２ａは、図２に示す様に、組み合わせシールリングと呼ばれ、芯金１４と、スリンガ１５と、シール部材１６とから成る。このうちの芯金１４は、冷間圧延鋼板（ＳＰＣＣ）等の金属板にプレス加工等の打ち抜き加工並びに塑性加工を施す事により、一体成形している。この様な芯金１４は、上記外輪１の内端部内周面に内嵌固定自在な外径側円筒部１７と、この外径側円筒部１７の軸方向外端縁（図２の左端縁）から直径方向内方に折れ曲がった内側円輪部１８とを備えた、断面略Ｌ字形で全体を円環状としている。尚、上記外側円筒部１７の自由状態に於ける外径は、上記外輪１の内端開口部の内径よりも僅かに大きくする事により、上記芯金１４をこの外輪１の内端部に締り嵌めで内嵌固定自在としている。
【０００５】
又、上記スリンガ１５は、ステンレス鋼板（ＳＵＳ４３０）等の優れた耐食性を有する金属板に、やはりプレス加工等の打ち抜き加工並びに塑性加工を施す事により、一体成形している。この様なスリンガ１５は、前記内輪５の内端部外周面に外嵌固定自在な内径側円筒部１９と、この内径側円筒部１９の内端縁（図２の右端縁）から直径方向外方に折れ曲がった外側円輪部２０とを備えた、断面Ｌ字形で全体を円環状としている。
【０００６】
又、上記シール部材１６は、ゴムの如きエラストマー等の弾性材により造られて、外側、中間、内側の３本のシールリップ２１、２２、２３を備え、上記芯金１４にその基端部を結合固定している。そして、上記空間１３の内外方向に関して、最も外側に位置する外側シールリップ２１の先端縁を上記スリンガ１５を構成する外側円輪部２０の内側面に摺接させ、残り２本のシールリップである中間シールリップ２２及び内側シールリップ２３の先端縁を、上記スリンガ１５を構成する内径側円筒部１９の外周面に摺接させる事により、前記空間１３内からのグリースの漏洩を防止すると共に、外部からこの空間１３内に、塵挨、水、泥水等の異物が進入する事を防止している。
【０００７】
これに対して、上記空間１３の外端開口部を塞ぐシール装置１２ｂは、図３に示す様に、それぞれが円環状に形成された芯金２４とシール部材２５とから成る。このうちの芯金２４は、冷間圧延鋼板（ＳＰＣＣ）等の金属板にプレス加工等の打ち抜き加工並びに塑性加工を施す事により、一体成形している。この芯金２４は、前記外輪１の外端部内周面に内嵌固定自在な円筒部２９と、この円筒部２９の外端縁（図３の左端縁）から直径方向内方に折れ曲がった支持板部３０とを備える。尚、上記円筒部２９の自由状態に於ける外径は、上記外輪１の外端開口部の内径よりも僅かに大きくする事により、上記芯金２４をこの外輪１の外端部に締り嵌めで内嵌固定自在としている。
【０００８】
又、上記シール部材２５は、ゴムの如きエラストマー等の弾性材により造っている。この様なシール部材２５は上記芯金２４に対し、この芯金２４を成形型のキャビティ内にセットした状態でモールド成形する事により、この芯金２４に対し接合固定している。この様なシール部材２５は、外径側、内径側、２本のサイドシールリップ２６、２７と、１本のラジアルシールリップ２８とを備える。そして、これら各シールリップ２６、２７、２８の先端縁を、それぞれ前記ハブ４の表面に摺接させる事により、前記空間１３の外端開口部を密封している。特に、上記外径側、内径側、両サイドシールリップ２６、２７を、それぞれ先端縁（図３の左端縁）に向かう程直径方向外方（図３の上方）に向かう方向に傾斜させる事により、上記空間１３内への異物進入防止機能を確保している。これに対し、上記ラジアルシールリップ２８を、先端縁（図３の右下縁）に向かう程上記空間１３の内側（図３の右側）に向かう方向に傾斜させる事により、グリースの漏洩防止機能を確保している。
【０００９】
次に、図４〜５は、同じく本発明の対象となる、自動車の車輪を懸架装置に支持する為の複列転がり軸受の２例を示している。これら各複列転がり軸受はそれぞれ、内周面に複列の外輪軌道８、８を有する外輪１ａ、１ｂと、それぞれの外周面に内輪軌道９を有する１対の内輪５、５と、これら各内輪軌道９、９と上記各外輪軌道８、８との間にそれぞれ複数個ずつ、図示しない保持器により保持した状態で転動自在に設けられた転動体１０、１０とを備える。そして、これら各転動体１０、１０を設置した空間１３の両端開口部を、それぞれ前述の図２に詳示した様なシール装置１２ａ、１２ａにより密封している。尚、図４に示した複列転がり軸受を構成する外輪１ａは、ＳＵＪ２に焼き入れ処理を施す事により造ると共に、その外周面を単なる円筒面としているのに対し、図５に示した複列転がり軸受を構成する外輪１ｂは、Ｓ５３ＣＧに高周波焼き入れ処理を施す事により造ると共に、その外周面に取付部２を設けている。これら図４〜５に示した各複列転がり軸受はそれぞれ、懸架装置に上記各外輪１ａ、１ｂを支持すると共に、それぞれＳＵＪ２に焼き入れ処理を施す事により造られた上記各内輪５、５の内径側に、車輪と共に回転する軸部材を嵌合支持する。
【００１０】
次に、図６は、同じく本発明の対象となる、独立式の懸架装置に支持する従動輪（ＦＦ車の後輪、ＦＲ車及びＲＲ車の前輪）用の自動車用ハブユニットの第１例を示している。この図６に示した自動車用ハブユニットは、従動輪用である事に伴い、ハブ４ａの中心部にスプライン孔を設けていない。又、このハブ４ａの内端部に設けた円筒部３１の先端部を径方向外方に塑性変形させてかしめ部３２を形成し、このかしめ部３２により上記ハブ４ａと共に内輪相当部材３ａを構成する内輪５を抑え付けている。又、この図６に示した従動輪用の自動車用ハブユニットの場合も、前述の図１に示した駆動輪用の自動車用ハブユニットの場合と同様、各転動体１０、１０を設置した空間１３の両端開口部を、それぞれ前述の図２〜３に詳示した様なシール装置１２ａ、１２ｂにより密封している。尚、上記ハブ４ａは、Ｓ５３ＣＧに高周波焼き入れ処理を施す事により造ると共に、上記内輪５を、ＳＵＪ２に焼き入れ処理を施す事により造っている。
【００１１】
次に、図７は、同じく本発明の対象となる、従動輪用の自動車用ハブユニットの第２例を示している。この図７に示した自動車用ハブユニットは、外周面の外端寄り部分に車輪を固定する為の取付フランジ７を、内周面の中間部乃至内端部に複列の外輪軌道８、８を、それぞれ有するハブ４ｂと、それぞれの外周面に内輪軌道９を有する１対の内輪５、５と、これら各内輪軌道９、９と上記各外輪軌道８、８との間にそれぞれ複数個ずつ、図示しない保持器により保持した状態で転動自在に設けられた転動体１０、１０とを備える。そして、これら各転動体１０、１０を設置した空間１３の内端開口部を、前述の図２に詳示した様なシール装置１２ａにより密封している。車両への組み付け時には、懸架装置の一部に設けた支持軸に、上記各内輪５、５を外嵌固定する。又、上記取付フランジ７に車輪を固定する。尚、上記ハブ４ｂは、Ｓ５３ＣＧに高周波焼き入れ処理を施す事により造ると共に、上記各内輪５、５を、ＳＵＪ２に焼き入れ処理を施す事により造っている。
【００１２】
次に、図８は、同じく本発明の対象となる、従動輪用の自動車用ハブユニットを構成する為の、複列転がり軸受の１例を示している。この複列転がり軸受は、外周面の内端部に取付部２を、内周面に複列の外輪軌道８、８を、それぞれ有する外輪１ｃと、それぞれの外周面に内輪軌道９を有する１対の内輪５、５と、これら各内輪軌道９、９と上記各外輪軌道８、８との間にそれぞれ複数個ずつ、図示しない保持器により保持した状態で転動自在に設けられた転動体１０、１０とを備える。そして、これら各転動体１０、１０を設置した空間１３の外端開口部を、前述の図２に詳示した様なシール装置１２ａにより密封している。この図８に示した複列転がり軸受は、使用時に従動輪と共に回転するハブに上記各内輪５、５を外嵌固定する事により、従動輪用の自動車用ハブユニットを構成する。又、車両への組み付け時には、懸架装置に上記外輪１ｃを、上記取付部２により結合固定する。尚、上記外輪１ｃは、Ｓ５３ＣＧに高周波焼き入れ処理を施す事により造ると共に、上記各内輪５、５を、ＳＵＪ２に焼き入れ処理を施す事により造っている。
【００１３】
【発明が解決しようとする課題】
上述した様な自動車用ハブユニットに組み付ける各シール装置１２ａ、１２ｂの場合、路面から巻き上げられる雨水や泥水、洗車時の洗浄水等に曝されると言った、厳しい環境下で使用される。そして、この様な雨水、泥水、洗浄水等の水分が、上記各シール装置１２ａ、１２ｂを構成する芯金１４、２４の外径側円筒部１７若しくは円筒部２９の外周面と外輪１、１ａ、１ｂ、１ｃの内周面との嵌合部の隙間を通じて、転動体１０、１０を設けた空間１３内に浸入する可能性がある。
【００１４】
即ち、上記各シール装置１２ａ、１２ｂは上記外輪１、１ａ、１ｂ、１ｃの端部内周面に、上記芯金１４、２４の外径側円筒部１７若しくは円筒部２９を締り嵌めで嵌合固定する事により、この外輪１、１ａ、１ｂ、１ｃに保持している。そして、これら外輪１、１ａ、１ｂ、１ｃの端部内周面と外径側円筒部１７若しくは円筒部２９の外周面との嵌合状態によっては、この嵌合部の隙間を通じて上記雨水、泥水、洗浄水等の水分が上記空間１３内に浸入する可能性がある。尚、上記各シール装置１２ａ、１２ｂのうちの、図２に示す様な組み合わせシールリング（シール装置１２ａ）の場合には、内輪５の端部外周面とスリンガ１５の内径側円筒部１９の内周面との嵌合状態によっても、この嵌合部の隙間を通じて上記雨水、泥水、洗浄水等の水分が上記空間１３内に浸入する可能性もある。この様な雨水、泥水、洗浄水等の水分の浸入は、上記各転動体１０、１０と各外輪軌道８、８及び各内輪軌道９、９との転がり接触部を潤滑するグリースの劣化を促進させるほか、この転がり接触部に形成される油膜を破断し易くし、自動車用ハブユニット等の転がり軸受の耐久性を低下させる可能性がある。
【００１５】
上述の様な外輪１、１ａ、１ｂ、１ｃの内周面と芯金１４、２４の外径側円筒部１７若しくは円筒部２９の外周面との嵌合部を通じて上述の様な雨水、泥水、洗浄水等の水分が浸入するのを防止すべく、図９〜１０に示す様な構造が考えられる。即ち、シール装置１２ａ´、１２ｂ´を構成するシール部材１６ａ、２５ａの一部を、芯金１４ａ、２４ａを構成する外径側円筒部１７ａ或は円筒部２９ａの端部外周面に配置し、この部分をこの外径側円筒部１７ａ或は円筒部２９ａの外周面と外輪１、１ａ、１ｂ、１ｃの内周面とで挟持する事により、上記芯金１４ａ、２４ａと外輪１、１ａ、１ｂ、１ｃとの密封性を確保する。ところが、この様な構造の場合、上記芯金１４ａ、２４ａの形状が複雑になる為、シール装置１２ａ´、１２ｂ´のコストが嵩む可能性がある。
【００１６】
しかも、この様なシール装置１２ａ´、１２ｂ´を製造する際、即ち上記芯金１４ａ、２４ａにシール部材１６ａ、２５ａを添着する際、この芯金１４ａ、２４ａと成形型との当接部分の面積が減少する事が避けられない。この為、上記シール部材１６ａ、２５ａを構成する弾性材の成形時の流動圧により、上記芯金１４ａ、２４ａが上記成形型内で変位し易くなり、このシール装置１２ａ´、１２ｂ´の寸法精度を確保しにくくなる可能性がある。この様にシール装置１２ａ´、１２ｂ´の寸法精度が低くなると、上記シール部材１６ａ、２５ａを構成する各シールリップ２１、２２、２３、２６、２７、２８とこれら各シールリップ２１、２２、２３、２６、２７、２８が摺接するスリンガ１５或はハブ４の摺接面との摺接部分から雨水、泥水や粉塵等の異物が浸入し易くなる。この為、上記外輪１、１ａ、１ｂ、１ｃの内周面と外径側円筒部１７ａ或は円筒部２９ａの外周面との間から上記雨水、泥水、洗浄水等の浸入を防止する事ができても、グリース劣化を招いて軸受寿命が低下する可能性がある。
【００１７】
本発明のシール装置付転がり軸受は、上述の様な事情に鑑みて、雨水、泥水、洗浄水等に曝されると言った厳しい環境下で使用される場合でも、この様な雨水、泥水、洗浄水等の水分が芯金とこの芯金を固定する軌道輪との嵌合部を通じて浸入するのを防止する事により、自動車用ハブユニット等のシール装置付転がり軸受の耐久性を向上させるべく発明したものである。
【００１８】
【課題を解決するための手段】
本発明のシール装置付転がり軸受は、外輪と、内輪と、複数個の転動体と、シール装置とを備える。
このうちの外輪は、内周面に外輪軌道を有する。
又、上記内輪は、外周面に内輪軌道を有する。
又、上記各転動体は、上記外輪軌道と内輪軌道との間に転動自在に設けられている。
又、上記シール装置は、上記外輪の内周面と上記内輪の外周面との間に存在して上記各転動体を設置した空間の端部開口を塞ぐ。
そして、このシール装置は、金属製の芯金と弾性材製のシール部材とを有し、このうちの芯金を上記外輪と上記内輪とのうちの一方の軌道輪に保持した状態で、上記シール部材を上記外輪と上記内輪とのうちの他方の軌道輪若しくはこの他方の軌道輪と共にこのシール部材に対し相対回転する部分に全周に亙って摺接させたものである。
特に、本発明のシール装置付転がり軸受に於いては、上記芯金は、例えば厚さが０．５〜０．８ｍｍ程度（より好ましくは０．６ｍｍ程度）の冷間圧延鋼板、炭素鋼板等の金属板により造ると共に、上記一方の軌道輪の周面に締り嵌めにより嵌合固定自在な円筒部を有するものである。そして、この円筒部の周面と上記一方の軌道輪の周面との締め代（自由状態での両周面の直径の差）を、この一方の軌道輪の周面の直径の０．０５〜０．４５％としている。
【００１９】
又、好ましくは、シール装置を、芯金とシール部材とスリンガとから成る組み合わせシールリングとする。そして、このうちの芯金の円筒部を、固定側軌道輪となる一方の軌道輪の周面に締り嵌めにより嵌合固定すると共に、上記シール部材を、回転側軌道輪となる他方の軌道輪と共にこのシール部材に対し相対回転する上記スリンガに摺接させる。
更には、このスリンガを、例えば厚さが０．５〜０．８ｍｍ程度（より好ましくは０．６ｍｍ程度）のステンレス鋼板等の金属板により造ると共に、上記他方の軌道輪の周面に、締り嵌めにより嵌合固定自在の円筒部を有するものとする。そして、この円筒部の周面と上記他方の軌道輪の周面との締め代を、この他方の軌道輪の直径の０．０５〜０．４５％とする。
【００２０】
【作用】
上述の様に構成する本発明のシール装置付転がり軸受によれば、シール装置を構成する芯金の円筒部の周面と、一方の軌道輪の周面との嵌合部の密封性を適正に確保して、この嵌合部から雨水、泥水、洗浄水等の水分が浸入する事を防止できる。又、上記シール装置を組み合わせシールリングとした場合には、スリンガの円筒部の周面と、回転側軌道輪である他方の軌道輪の周面との嵌合部の密封性も適正に確保して、この嵌合部から雨水、泥水、洗浄水等の水分が浸入する事を防止できる。従って、この様な雨水、泥水、洗浄水等に曝されると言った厳しい環境下で使用する場合でも、転がり軸受内に封入したグリースの劣化、並びに、転がり接触部に形成される油膜の破断を防止して、自動車用ハブユニット等の転がり軸受の耐久性を十分に確保できる。
【００２１】
尚、上記芯金の円筒部及びスリンガの円筒部の周面と当該軌道輪の周面との締め代が、当該軌道輪の周面の直径の０．０５％未満の場合には、これら円筒部の周面と軌道輪の周面との嵌合部の密封性を十分に確保できなくなり、この嵌合部から上記雨水、泥水、洗浄水等の水分が浸入し易くなる可能性がある。一方、上記締め代が０．４５％を越える場合には、上記円筒部を当該軌道輪に嵌合固定した際にこの円筒部に座屈等の塑性変形が生じ易くなり、この変形部分から上記雨水、泥水、洗浄水等の水分が浸入し易くなる。
【００２２】
【発明の実施の形態】
図１〜３は、本発明の実施の形態の１例を示している。尚、本発明の特徴は、シール装置付転がり軸受である自動車用ハブユニットの耐久性を確保すべく、シール装置１２ａ、１２ｂを構成する芯金１４、２４及びスリンガ１５の周面とこれら芯金１４、２５及びスリンガ１５を固定する外輪１及び内輪５の周面との嵌合部の締め代を規制して、この嵌合部を通じて雨水、泥水、洗浄水等の水分が浸入する事を防止する点にある。その他の部分の構造及び作用は、前述の従来の技術の項で上記図１〜３を用いて説明した通りであるので、重複する説明を省略若しくは簡略にし、以下、本発明の特徴部分を中心に説明する。
【００２３】
本例の場合、外輪１の内端部内周面と内輪５の内端部外周面との間に設けた組み合わせシールリングであるシール装置１２ａは、図２に示す様に、それぞれが円環状に形成された芯金１４と、スリンガ１５と、シール部材１６とから成る。このうちの芯金１４は、冷間圧延鋼板（ＳＰＣＣ）等の例えば厚さ０．５〜０．８ｍｍ程度（より好ましくは０．６ｍｍ程度）の金属板にプレス加工等の打ち抜き加工並びに塑性加工を施す事により一体成形しており、炭素鋼（Ｓ５３ＣＧ）に高周波焼き入れ処理を施す事により造られた上記外輪１の内端部内周面に内嵌固定自在な外径側円筒部１７を有する。そして、この外側円筒部１７の外周面と上記外輪１の外端部内周面との締め代｛自由状態での両周面の外径Ｄ１７と内径ｄＩ　（図１）との差｝を、この外輪１の内端部の内径ｄＩ　の０．０５〜０．４５％としている。
【００２４】
又、上記スリンガ１５は、ステンレス鋼板（ＳＵＳ４３０）等の優れた耐食性を有する例えば厚さ０．５〜０．８ｍｍ程度（より好ましくは０．６ｍｍ程度）の金属板に、やはりプレス加工等の打ち抜き加工並びに塑性加工を施す事により一体成形しており、軸受鋼（ＳＵＪ２）に焼き入れ処理を施す事により造られた上記内輪５の内端部外周面に外嵌固定自在な内径側円筒部１９を有する。そして、この内径側円筒部１９の内周面と上記内輪５の内端部外周面との締め代｛自由状態での両周面の内径ｄ１９と外径Ｄ５　（図１）との差｝を、この内輪５の内端部の外径Ｄ５　の０．０５〜０．４５％としている。
【００２５】
一方、上記外輪１の外端部内周面とハブ４の中間部外周面との間に設けたシール装置１２ｂは、図３に示す様に、それぞれが円環状に形成された芯金２４とシール部材２５とから成る。このうちの芯金２４は、冷間圧延鋼板（ＳＰＣＣ）等の例えば厚さ０．５〜０．８ｍｍ程度（より好ましくは０．６ｍｍ程度）の金属板にプレス加工等の打ち抜き加工並びに塑性加工を施す事により一体成形しており、上記外輪１の外端部内周面に内嵌固定自在な円筒部２９を有する。そして、この円筒部２９の外周面と上記外輪１の外端部内周面との締め代｛自由状態での両周面の外径Ｄ２９と内径ｄＯ　（図１）との差｝を、この外輪１の外端部の内径ｄＯ　の０．０５〜０．４５％としている。
【００２６】
上述の様に構成する本例の場合には、シール装置１２ａ、１２ｂを構成する芯金１４、２４の外径側円筒部１７及び円筒部２９の外周面と、外輪１の両端部内周面との嵌合部の密封性を適正に確保して、この嵌合部から雨水、泥水、洗浄水等の水分が浸入する事を防止できる。又、上記各シール装置１２ａ、１２ｂのうち、組み合わせシールリングであるシール装置１２ａは、スリンガ１５の内径側円筒部１９の内周面と、内輪５の内端部外周面との嵌合部の密封性も適正に確保して、この嵌合部から雨水、泥水、洗浄水等の水分が浸入する事を防止できる。従って、この様な雨水、泥水、洗浄水等に曝されると言った厳しい環境下で使用する場合でも、転がり軸受内に封入したグリースの劣化、並びに、転がり接触部に形成される油膜の破断を防止して、自動車用ハブユニットの耐久性を十分に確保できる。
【００２７】
尚、上記芯金１４、２４外径側円筒部１７並びに円筒部２９及びスリンガ１５の内径側円筒部１９の周面と当該軌道輪１、５の周面との締め代が、当該軌道輪１、５の周面の直径の０．０５％未満の場合には、これら円筒部１７、２９、１９の周面と軌道輪１、５の周面との嵌合部の密封性を十分に確保できなくなり、この嵌合部から上記雨水、泥水、洗浄水等の水分が浸入し易くなる可能性がある。一方、上記締め代が０．４５％を越える場合には、上記円筒部１７、２９、１９を当該軌道輪１、５に嵌合固定した際にこれら円筒部１７、２９、１９に座屈等の塑性変形が生じ易くなり、この変形部分から上記雨水、泥水、洗浄水等の水分が浸入し易くなる。
【００２８】
【実施例】
本発明の効果を確認する為に、本発明者が行なった実験に就いて説明する。尚、本発明が、以下に説明する実験に供した実施例に限定されるものではない事は勿論である。
実験は、各材料を次の表１に記載した配合比で混合して成るシール部材１６を備えた図２に示すシール装置１２ａに就いて、このシール装置１２ａの密封性能とこのシール装置１２ａを構成する芯金１４の外径側円筒部１７の外周面とこの外径側円筒部１７を内嵌固定する一方の軌道輪である外輪１（後述するハウジング３８）の内周面との締め代との関係を調べた。尚、下記の表１に記載した数値は、それぞれ重量部を表している。
【００２９】
【表１】

Figure 2004076784
【００３０】
先ず、上記表１に記載した材料のうちの加硫促進剤を除く材料を、この表１に記載した割合で混合し、この混合したゴム生地を１５０℃になるまで加圧ニーダを用いて混練りした。そして、得られた混練物（ゴム生地）に上記加硫促進剤を上記表１に記載した割合で添加し、それぞれ回転速度を２０ｍｉｎ−１　、３２ｍｉｎ−１　で回転させた８インチロールで温度を５０℃に保ちつつ混練を施し、厚さ約０．８ｍｍの未加硫ゴムシートを作成した。次に、厚さ０．６ｍｍの冷間圧延鋼板（ＳＰＣＣ）をプレス成形により図２に示す形状に形成した芯金１４を洗浄した後、この芯金１４の一部でシール部材１６を添着する部分に接着剤を塗布した状態で、この芯金１４と上記未加硫ゴムシートとを成形型のキャビティ内にセットし、圧力４．９ＭＰａ　（５０ｋｇｆ　／ｃｍ２　）で加圧しつつ１８０℃で５分間、加硫成形を行なった。尚、この様に形成したシール装置１２ａを構成する芯金１４の外径側円筒部１７の外径は７２．０２２ｍｍであり、同じくスリンガ１５の内径側円筒部１９の内径は５９．９７５ｍｍである。尚、上記スリンガ１５は、ステンレス鋼板（ＳＵＳ４３０）により造られ、厚さは０．６ｍｍである。
【００３１】
そして、このシール装置１２ａを、図１１に示す様なシール単体回転試験機３３に装着し、同図に示す様に回転軸３４の中心まで泥水３５を注入し、５００ｍｉｎ−１　で５００時間の泥水浸入試験を実施した。上記シール単体回転試験機３５は、試料である上記シール装置１２ａを、内部に貯溜した上記泥水３５に浸漬させた状態で、回転軸３４を所定の回転速度で回転自在としている。そして、上記シール装置１２ａを挟んで上記泥水３５と反対側に設けた漏電センサ３６により、上記シール装置１２ａを通過した泥水を検知自在としている。又、このシール装置１２ａを構成する芯金１４の外径側円筒部１７の外周面と、上記シール単体回転試験機３３のハウジング３７（外輪１に相当）の内周面との締め代は、このハウジング３７の内周面の内径寸法ｄ３７を変える事により所望の値に調節した。そして、この外径側円筒部１７の外周面とハウジング３７の内周面との締め代を、このハウジング３７の内径ｄ３７の０〜０．５％の範囲で種々変化させつつ、泥水浸入試験を行なった。尚、スリンガ１５の内径側円筒部１９の内周面と上記回転軸３４の外周面との締め代は、この回転軸３４の外径Ｄ３４の０．０５〜０．４５％の範囲内で一定の値（０．１２％）とした。又、上記ハウジング３７はＳ５３ＣＧにより造られ、内周面に高周波焼き入れ処理を施したものであり、上記回転軸３４は、ＳＵＪ２に焼き入れ処理を施したものである。その他の試験条件を以下に示す。
軸偏心量：０．１ｍｍＴＩＲ以下
泥水組成：ＪＩＳ　８種ダスト　３０％
使用グリース：ウレア化合物、鉱油
グリース塗布量：外側シールリップ２１と中間シールリップ２２との間に０．３ｇ、中間シールリップ２２と内側シールリップ２３との間に０．１ｇ
【００３２】
上述の様な条件で行なった泥水浸入試験の結果を、図１２に示す。この図１２に示した結果から明らかな様に、シール装置１２ａを構成する芯金１４の外径側円筒部１７の外径とハウジング３７の内周面の内径ｄ３７との締め代を、このハウジング３８の内径ｄ３７の０．０５〜０．４５％とする事により、泥水の浸入を４００時間以上防止する事ができる。更に上記締め代を上記内径ｄ３７の０．００７〜０．４５％とすれば、上記浸入を５００時間以上防止できる。言い換えれば、この様に締め代を規制する事により、このシール装置１２ａを組み付けたシール装置付転がり軸受の耐久性を十分に確保できる事が確認できた。
【００３３】
尚、上述した実施例では、シール装置として前述の図２に示したシール装置１２ａを用いたが、本発明者が前述の図３に示したシール装置１２ｂを用いて同様の試験を行なったところ、上述した実施例の場合と同様の結果が得られた。即ち、図３に示す上記シール装置１２ｂに就いても、このシール装置１２ｂの密封性能とこのシール装置１２ｂを構成する芯金２４の円筒部２９の外周面とこの円筒部２９を内嵌固定する一方の軌道輪である外輪１の内周面との締め代との関係を調べるべく、上述の様な泥水浸入試験を行なった。この結果、上記シール装置１２ｂを構成する芯金２４の円筒部２９の外径と外輪１の内周面の内径との締め代を、この外輪１の内径の０．０５〜０．４５％とする事により、泥水の浸入を防止できる事が確認できた。
【００３４】
【発明の効果】
本発明のシール装置付転がり軸受は、以上に述べた様に構成され作用するので、雨水、泥水洗浄水等に曝されると言った厳しい環境下で使用される場合でも、この様な雨水、泥水、洗浄水等の水分が転がり軸受の内部に浸入する事を防止できる。この為、この様な厳しい環境下で使用される自動車用ハブユニット等のシール装置付転がり軸受の長寿命化を図れる。
【図面の簡単な説明】
【図１】本発明の実施の形態の１例を示す断面図。
【図２】図１の右端部に組み付けたシール装置を取り出して示す部分拡大断面図。
【図３】図１の中間部に組み付けたシール装置を取り出して示す部分拡大断面図。
【図４】本発明の対象となる自動車用ハブユニットを構成する為の、複列転がり軸受の第１例を示す断面図。
【図５】同第２例を示す断面図。
【図６】本発明の対象となる従動輪用の自動車用ハブユニットの第１例を示す断面図。
【図７】同第２例を示す断面図。
【図８】本発明の対象となる従動輪用の自動車用ハブユニットを構成する為の、複列転がり軸受の１例を示す断面図。
【図９】改良されたシール装置の第１例を示す、図２と同様の断面図。
【図１０】改良されたシール装置の第２例を示す、図３と同様の断面図。
【図１１】泥水浸入試験装置を示す断面図。
【図１２】実験結果を示すグラフ。
【符号の説明】
１、１ａ、１ｂ、１ｃ　外輪
２　　取付部
３、３ａ　内輪相当部材
４、４ａ、４ｂ　ハブ
５　　内輪
６　　スプライン孔
７　　取付フランジ
８　　外輪軌道
９　　内輪軌道
１０　　転動体
１１　　保持器
１２ａ、１２ａ´、１２ｂ、１２ｂ´　シール装置
１３　　空間
１４、１４ａ　芯金
１５　　スリンガ
１６、１６ａ　シール部材
１７、１７ａ　外径側円筒部
１８　　内径円輪部
１９　　内径側円筒部
２０　　外側円輪部
２１　　外側シールリップ
２２　　中間シールリップ
２３　　内側シールリップ
２４、２４ａ　芯金
２５、２５ａ　シール部材
２６　　外径側サイドシールリップ
２７　　内径側サイドシールリップ
２８　　ラジアルシールリップ
２９、２９ａ　　円筒部
３０　　支持板部
３１　　円筒部
３２　　かしめ部
３３　　シール単体回転試験機
３４　　回転軸
３５　　泥水
３６　　漏電センサ
３７　　ハウジング[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an improvement in a rolling bearing with a seal device such as a hub unit for a vehicle for supporting wheels of a vehicle (vehicle) on a suspension device. In particular, the present invention is intended to prevent such water such as rainwater, muddy water, and washing water from entering the rolling bearings even when used in a severe environment such as being exposed to rainwater, muddy water, and washing water. This is intended to ensure the durability of the rolling bearing with the seal device by preventing the occurrence of the above problem.
[0002]
[Prior art]
For example, a vehicle hub unit is used to support the wheels of the vehicle on a suspension. An example of such a hub unit for an automobile, which is a rolling bearing with a seal device, which is an object of the present invention, will be described with reference to FIG. 1 showing an example of an embodiment of the present invention. FIG. 1 shows an example of an automobile hub unit for driving wheels (front wheels of FF vehicles, rear wheels of FR and RR vehicles, all wheels of 4WD vehicles) supported by an independent suspension device. An outer ring 1, which is an outer ring-equivalent member, made by subjecting carbon steel (S53CG) to induction hardening is supported and fixed to a suspension device by a mounting portion 2 formed on the outer peripheral surface, and does not rotate during use. . An inner ring-equivalent member 3 serving as a rotating-side bearing ring is provided concentrically with the outer ring 1 on the inner diameter side of the outer ring 1 serving as such a fixed-side bearing ring so that the inner ring-equivalent member 3 rotates during use. I have. The inner ring-equivalent member 3 includes a hub 4 formed by performing induction hardening on carbon steel (S53CG) and an inner ring 5 formed by performing quenching on bearing steel (SUJ2). A spline hole 6 is formed at the center of the hub 4, and a mounting flange 7 is formed at the outer end (the left end in FIG. 1, which is the outer side in the width direction when assembled to the vehicle). ing. At the time of assembly to a vehicle, a spline shaft attached to a constant velocity joint (not shown) is inserted into the spline hole 6, and wheels are fixed to the mounting flange 7.
[0003]
Also, double rows of outer raceways 8, 8 are formed on the inner periphery of the outer race 1 and inner raceways 9, 9 are formed on the outer periphery of the intermediate portion of the hub 4 and the outer periphery of the inner race 5, respectively. A plurality of rolling elements 10, 10 are provided between the outer raceways 8, 8 and the inner raceways 9, 9, respectively, so that the inner race-equivalent member 3 can rotate freely inside the outer race 1. . The rolling elements 10, 10 are held by rollers 11, 11 so as to freely roll. Although balls are used as the rolling elements 10 and 10 in the illustrated example, tapered rollers may be used as the rolling elements in the case of a heavy-weight bearing for a vehicle. Furthermore, between the inner peripheral surface of the inner end of the outer race 1 and the outer peripheral surface of the inner end of the inner race 5, and between the outer peripheral surface of the outer end of the outer race 1 and the intermediate peripheral surface of the hub 4, Sealing devices 12a and 12b are provided to close both ends of a space 13 in which the rolling elements 10 and 10 are installed between the inner peripheral surface of the outer ring 1 and the outer peripheral surface of the inner ring-equivalent member 3, respectively.
[0004]
The two sealing devices 12a and 12b are configured as shown in FIGS. First, as shown in FIG. 2, the sealing device 12a that closes the inner end of the space 13 (the end that is located at the center in the width direction when assembled to the vehicle, the right end in FIG. 1) is called a combination seal ring as shown in FIG. It comprises a metal core 14, a slinger 15, and a sealing member 16. The core metal 14 is integrally formed by subjecting a metal plate such as a cold-rolled steel plate (SPCC) to a punching process such as a press process and a plastic process. Such a core metal 14 includes an outer cylindrical portion 17 that can be fitted and fixed on the inner peripheral surface of the inner end portion of the outer race 1, and an axial outer edge of the outer cylindrical portion 17 (the left edge in FIG. 2). ) And an inner annular portion 18 bent inward in the diametrical direction, and has a substantially L-shaped cross-section and is entirely annular. The outer diameter of the outer cylindrical portion 17 in the free state is made slightly larger than the inner diameter of the inner end opening of the outer ring 1 so that the metal core 14 is fastened to the inner end of the outer ring 1. The inner fitting can be fixed by fitting.
[0005]
Further, the slinger 15 is integrally formed by performing a punching process such as a press process and a plastic process on a metal plate having excellent corrosion resistance such as a stainless steel plate (SUS430). Such a slinger 15 includes an inner cylindrical portion 19 that can be fitted and fixed to the outer peripheral surface of the inner end of the inner ring 5, and a radially outer portion from the inner edge (the right edge in FIG. 2) of the inner cylindrical portion 19. It has an outer ring portion 20 bent in a direction, and has an L-shaped cross section and is entirely annular.
[0006]
The seal member 16 is made of an elastic material such as an elastomer such as rubber, and includes three outer, middle and inner seal lips 21, 22, and 23. The connection is fixed. Then, with respect to the inside and outside directions of the space 13, the leading edge of the outer seal lip 21 located at the outermost position is slidably contacted with the inner surface of the outer annular portion 20 constituting the slinger 15, and the remaining two seal lips are formed. By sliding the tip edges of the intermediate seal lip 22 and the inner seal lip 23 to the outer peripheral surface of the inner cylindrical portion 19 constituting the slinger 15, leakage of grease from the space 13 is prevented, and This prevents foreign substances such as dust, water, muddy water and the like from entering this space 13.
[0007]
On the other hand, the sealing device 12b for closing the outer end opening of the space 13 includes a core metal 24 and a sealing member 25, each of which is formed in an annular shape, as shown in FIG. The core metal 24 is integrally formed by subjecting a metal plate such as a cold rolled steel plate (SPCC) to a punching process such as a press process and a plastic process. The metal core 24 has a cylindrical portion 29 that can be fitted and fixed on the inner peripheral surface of the outer end of the outer ring 1, and a support that is bent inward in the diameter direction from the outer edge (the left edge in FIG. 3) of the cylindrical portion 29. A plate portion 30. The outer diameter of the cylindrical portion 29 in the free state is slightly larger than the inner diameter of the outer end opening of the outer ring 1 so that the metal core 24 is tightly fitted to the outer end of the outer ring 1. And can be fixed inside.
[0008]
Further, the seal member 25 is made of an elastic material such as an elastomer such as rubber. Such a sealing member 25 is bonded and fixed to the core 24 by molding the core 24 in a state where the core 24 is set in a cavity of a molding die. Such a sealing member 25 includes an outer diameter side, an inner diameter side, two side seal lips 26 and 27, and one radial seal lip 28. The outer edges of the space 13 are sealed by sliding the leading edges of the seal lips 26, 27, and 28 against the surface of the hub 4. In particular, by inclining the outer diameter side, the inner diameter side, and both side seal lips 26 and 27 in the direction toward the diametrically outward direction (upward in FIG. 3) toward the leading edge (left edge in FIG. 3), respectively. The function of preventing foreign matter from entering the space 13 is ensured. On the other hand, by inclining the radial seal lip 28 toward the inside of the space 13 (the right side in FIG. 3) toward the leading edge (the lower right edge in FIG. 3), the grease leakage preventing function is provided. Is secured.
[0009]
Next, FIGS. 4 and 5 show two examples of double-row rolling bearings for supporting wheels of an automobile on a suspension system, which are also objects of the present invention. Each of these double row rolling bearings has outer races 1a and 1b having double rows of outer raceways 8 and 8 on the inner peripheral surface, a pair of inner races 5 and 5 having an inner raceway 9 on the respective outer peripheral surfaces, and A plurality of rolling elements 10 and 10 are provided between the inner raceways 9 and 9 and the outer raceways 8 and 8 so as to be freely rolled while being held by a retainer (not shown). The openings at both ends of the space 13 in which the rolling elements 10, 10 are installed are sealed by the sealing devices 12a, 12a as shown in detail in FIG. The outer race 1a constituting the double row rolling bearing shown in FIG. 4 is manufactured by subjecting SUJ2 to quenching, and its outer peripheral surface is merely a cylindrical surface, whereas the outer row 1a shown in FIG. The outer ring 1b constituting the rolling bearing is manufactured by subjecting S53CG to high-frequency quenching, and is provided with a mounting portion 2 on its outer peripheral surface. Each of the double row rolling bearings shown in FIGS. 4 and 5 respectively supports the outer races 1a and 1b on a suspension device and hardens the SUJ 2 to form the inner races 5 and 5 respectively. A shaft member that rotates together with the wheel is fitted and supported on the inner diameter side.
[0010]
Next, FIG. 6 shows a first example of an automobile hub unit for driven wheels (rear wheels of an FF vehicle, front wheels of an FR vehicle and an RR vehicle) supported by an independent suspension device, which is also an object of the present invention. Is shown. The hub unit for an automobile shown in FIG. 6 has no spline hole at the center of the hub 4a because it is for a driven wheel. Further, the tip of a cylindrical portion 31 provided at the inner end of the hub 4a is plastically deformed radially outward to form a caulked portion 32, and the caulked portion 32 constitutes an inner ring equivalent member 3a together with the hub 4a. The inner ring 5 is held down. Also, in the case of the vehicle hub unit for driven wheels shown in FIG. 6, similarly to the case of the vehicle hub unit for drive wheels shown in FIG. 1, the space in which the rolling elements 10, 10 are installed. 13 are sealed by the sealing devices 12a and 12b as shown in detail in FIGS. The hub 4a is made by subjecting S53CG to high-frequency hardening, and the inner ring 5 is made by subjecting SUJ2 to hardening.
[0011]
Next, FIG. 7 shows a second example of an automobile hub unit for driven wheels, which is also an object of the present invention. The vehicle hub unit shown in FIG. 7 has a mounting flange 7 for fixing a wheel to a portion near an outer end of an outer peripheral surface, and a double row of outer ring raceways 8 and 8 at an intermediate portion to an inner end of an inner peripheral surface. , A pair of inner races 5, 5 having an inner raceway 9 on each outer peripheral surface, and a plurality of each between the inner raceways 9, 9 and the outer raceways 8, 8. And rolling elements 10 and 10 that are provided so as to freely roll while being held by a retainer (not shown). The inner end opening of the space 13 in which the rolling elements 10 and 10 are installed is sealed by the sealing device 12a as shown in FIG. At the time of assembling to a vehicle, the inner rings 5, 5 are externally fitted and fixed to a support shaft provided in a part of the suspension device. Further, the wheel is fixed to the mounting flange 7. The hub 4b is manufactured by subjecting S53CG to high-frequency quenching, and the inner rings 5, 5 are manufactured by quenching SUJ2.
[0012]
Next, FIG. 8 shows an example of a double-row rolling bearing for constituting an automobile hub unit for a driven wheel, which is also an object of the present invention. This double row rolling bearing has an outer ring 1c having a mounting portion 2 at the inner end of the outer peripheral surface, outer rows 1c having multiple rows of outer ring tracks 8 on the inner peripheral face, and an inner ring track 9 at each outer peripheral face. A rolling element rotatably provided while being held by a retainer (not shown), a plurality of inner rings 5, 5, and a plurality of each between the inner ring tracks 9, 9 and the outer ring tracks 8, 8. 10 and 10. The outer end opening of the space 13 in which the rolling elements 10 and 10 are installed is sealed by the sealing device 12a as shown in detail in FIG. The double-row rolling bearing shown in FIG. 8 constitutes an automobile hub unit for driven wheels by fixing the inner rings 5, 5 to the hub which rotates together with the driven wheels when in use. Further, at the time of assembling to a vehicle, the outer ring 1c is connected and fixed to the suspension device by the mounting portion 2. The outer ring 1c is made by subjecting S53CG to high-frequency quenching, and the inner rings 5, 5 are made by quenching SUJ2.
[0013]
[Problems to be solved by the invention]
Each of the sealing devices 12a and 12b to be mounted on the automobile hub unit as described above is used in a severe environment such as being exposed to rainwater, muddy water, washing water at the time of washing a car, etc. The water such as rainwater, muddy water, and washing water is supplied to the outer peripheral surface of the outer cylindrical portion 17 or the outer cylindrical portion 29 of the cores 14 and 24 constituting the sealing devices 12a and 12b and the outer rings 1 and 1a. There is a possibility of infiltration into the space 13 in which the rolling elements 10 and 10 are provided through the gap between the fitting portions of the inner surfaces 1b and 1c with the inner peripheral surfaces.
[0014]
That is, the respective sealing devices 12a and 12b are fitted and fixed to the inner peripheral surfaces of the ends of the outer rings 1, 1a, 1b and 1c by tightly fitting the outer diameter side cylindrical portion 17 or the cylindrical portion 29 of the cored bars 14 and 24. By doing so, it is held on the outer rings 1, 1a, 1b, 1c. Depending on the state of fitting between the inner peripheral surfaces of the end portions of the outer rings 1, 1a, 1b, and 1c and the outer peripheral surface of the outer diameter side cylindrical portion 17 or the cylindrical portion 29, the rainwater, muddy water, Moisture such as cleaning water may enter the space 13. In the case of a combined seal ring (seal device 12a) as shown in FIG. 2 among the seal devices 12a and 12b, the outer peripheral surface of the end of the inner ring 5 and the inner cylindrical portion 19 of the slinger 15 are formed. Depending on the state of fitting with the peripheral surface, there is a possibility that moisture such as rainwater, muddy water, and washing water may enter the space 13 through the gap between the fitting portions. Such infiltration of water such as rainwater, muddy water, and washing water accelerates the deterioration of the grease that lubricates the rolling contact portions between the rolling elements 10, 10 and the outer raceways 8, 8, and the inner raceways 9, 9. In addition, the oil film formed on the rolling contact portion may be easily broken, and the durability of the rolling bearing such as a hub unit for an automobile may be reduced.
[0015]
Rainwater, muddy water, etc. as described above through the fitting portion between the inner peripheral surfaces of the outer rings 1, 1a, 1b, 1c and the outer cylindrical surface 17 of the metal cores 14, 24 or the outer peripheral surface of the cylindrical portion 29 as described above. In order to prevent water such as washing water from entering, a structure as shown in FIGS. That is, a part of the sealing members 16a, 25a constituting the sealing devices 12a ', 12b' is arranged on the outer peripheral surface of the end portion of the outer cylindrical portion 17a or the cylindrical portion 29a constituting the metal cores 14a, 24a, By clamping this portion between the outer peripheral surface of the outer diameter side cylindrical portion 17a or the cylindrical portion 29a and the inner peripheral surface of the outer rings 1, 1a, 1b, and 1c, the cores 14a, 24a and the outer rings 1, 1a, 1b and 1c are secured. However, in the case of such a structure, since the shapes of the cores 14a and 24a are complicated, the cost of the sealing devices 12a 'and 12b' may increase.
[0016]
Moreover, when manufacturing such sealing devices 12a ', 12b', that is, when attaching the sealing members 16a, 25a to the metal cores 14a, 24a, the contact portions between the metal cores 14a, 24a and the molding die are formed. It is inevitable that the area will decrease. For this reason, the core metals 14a and 24a are easily displaced in the molding die due to the flow pressure at the time of molding the elastic material forming the sealing members 16a and 25a, and the dimensional accuracy of the sealing devices 12a 'and 12b'. May be difficult to secure. As described above, when the dimensional accuracy of the sealing devices 12a 'and 12b' is reduced, the sealing lips 21, 22, 23, 26, 27 and 28 constituting the sealing members 16a and 25a and the sealing lips 21, 22, and 23 are formed. , 26, 27, 28 slide in contact with the slinger 15 or the sliding surface of the hub 4, and foreign matter such as rainwater, muddy water and dust easily enters. For this reason, it is possible to prevent the rainwater, muddy water, washing water, and the like from entering between the inner peripheral surfaces of the outer rings 1, 1a, 1b, and 1c and the outer peripheral surface of the outer diameter side cylindrical portion 17a or the cylindrical portion 29a. Even if it is possible, the grease may be deteriorated and the bearing life may be shortened.
[0017]
Rolling bearing with a seal device of the present invention, in view of the above-described circumstances, even when used in a severe environment such as exposure to rainwater, muddy water, washing water, etc., such rainwater, muddy water, In order to improve the durability of rolling bearings with sealing devices, such as automotive hub units, by preventing water, such as washing water, from entering through the fitting portion between the core metal and the race that fixes the core metal. It was invented.
[0018]
[Means for Solving the Problems]
A rolling bearing with a seal device according to the present invention includes an outer ring, an inner ring, a plurality of rolling elements, and a seal device.
The outer race has an outer raceway on the inner peripheral surface.
The inner race has an inner raceway on an outer peripheral surface.
Each of the rolling elements is rotatably provided between the outer raceway and the inner raceway.
Further, the sealing device is provided between the inner peripheral surface of the outer race and the outer peripheral surface of the inner race to close an end opening of a space in which the rolling elements are installed.
The sealing device has a metal core and a sealing member made of an elastic material, and the core is held on one of the outer ring and the inner ring in the raceway. The seal member is brought into sliding contact with the other orbital ring of the outer ring and the inner ring or a portion of the outer ring and the inner ring that rotates relative to the seal member over the entire circumference.
In particular, in the rolling bearing with a seal device of the present invention, the core metal is, for example, a cold-rolled steel sheet, a carbon steel sheet, or the like having a thickness of about 0.5 to 0.8 mm (more preferably about 0.6 mm). And a cylindrical portion which can be fitted and fixed to the peripheral surface of the one orbital ring by interference fit. Then, the interference between the peripheral surface of the cylindrical portion and the peripheral surface of the one orbital ring (the difference between the diameters of the two peripheral surfaces in the free state) is set to 0.05 of the diameter of the peripheral surface of the one orbital ring. ０．４0.45%.
[0019]
Preferably, the sealing device is a combination seal ring including a cored bar, a sealing member, and a slinger. Then, the cylindrical portion of the core metal is fitted and fixed to the peripheral surface of one of the races serving as the fixed raceway by interference fit, and the seal member is fixed to the other raceway which becomes the rotation raceway. At the same time, the sliding member is brought into sliding contact with the slinger rotating relative to the sealing member.
Further, the slinger is made of a metal plate such as a stainless steel plate having a thickness of, for example, about 0.5 to 0.8 mm (more preferably, about 0.6 mm), and tightened on the peripheral surface of the other raceway. It has a cylindrical portion that can be fitted and fixed by fitting. The interference between the peripheral surface of the cylindrical portion and the peripheral surface of the other race is set to 0.05 to 0.45% of the diameter of the other race.
[0020]
[Action]
ADVANTAGE OF THE INVENTION According to the rolling bearing with a sealing device of this invention comprised as mentioned above, the sealing property of the fitting part of the peripheral surface of the cylindrical part of the core metal which comprises a sealing device, and the peripheral surface of one race is suitable. To prevent water such as rainwater, muddy water, and washing water from entering the fitting portion. When the sealing device is combined with a sealing ring, the sealing performance of the fitting portion between the peripheral surface of the cylindrical portion of the slinger and the peripheral surface of the other bearing ring, which is the rotating side bearing ring, is also properly secured. Thus, it is possible to prevent moisture such as rainwater, muddy water, and washing water from entering the fitting portion. Therefore, even when used in harsh environments such as exposure to rainwater, muddy water, washing water, etc., the grease sealed in the rolling bearings deteriorates, and the oil film formed on the rolling contact parts breaks. , And the durability of the rolling bearing such as a hub unit for an automobile can be sufficiently ensured.
[0021]
If the interference between the peripheral surface of the cylindrical portion of the core metal and the cylindrical portion of the slinger and the peripheral surface of the bearing ring is less than 0.05% of the diameter of the peripheral surface of the bearing ring, these cylindrical members It is not possible to sufficiently secure the sealing performance of the fitting portion between the peripheral surface of the portion and the peripheral surface of the bearing ring, and there is a possibility that moisture such as rainwater, muddy water, and washing water easily enters the fitting portion. On the other hand, if the interference exceeds 0.45%, plastic deformation such as buckling is likely to occur in the cylindrical portion when the cylindrical portion is fitted and fixed to the bearing ring. Moisture such as rainwater, muddy water, and washing water easily enters.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
1 to 3 show an example of an embodiment of the present invention. The feature of the present invention is that, in order to ensure the durability of an automobile hub unit which is a rolling bearing with a sealing device, the peripheral surfaces of the cores 14 and 24 and the slinger 15 constituting the sealing devices 12a and 12b and these cores are provided. The interference of the fitting portion between the outer ring 1 and the inner ring 5 for fixing the slinger 15 and the slinger 15 is restricted, and the penetration of moisture such as rainwater, muddy water, and washing water through the fitting portion is prevented. Is to do. The structure and operation of the other parts are the same as those described above with reference to FIGS. 1 to 3 in the section of the related art, so that the overlapping description will be omitted or simplified, and the following description will focus on the characteristic parts of the present invention. Will be described.
[0023]
In the case of this example, as shown in FIG. 2, each of the sealing devices 12a, which is a combined seal ring provided between the inner peripheral surface of the inner end portion of the outer race 1 and the outer peripheral surface of the inner end portion of the inner race 5, has an annular shape. It is composed of the formed metal core 14, slinger 15 and seal member 16. Among these, the core metal 14 is formed by stamping or plastic working on a metal plate such as a cold-rolled steel plate (SPCC) having a thickness of, for example, about 0.5 to 0.8 mm (more preferably about 0.6 mm). And an outer diameter side cylindrical portion 17 that can be fitted and fixed on the inner peripheral surface of the inner end portion of the outer ring 1 made by performing induction hardening treatment on carbon steel (S53CG). . The interference between the outer peripheral surface of the outer cylindrical portion 17 and the inner peripheral surface of the outer end of the outer ring 1 is the outer diameter D of both peripheral surfaces in a free state. 17 And inner diameter d I (FIG. 1) is defined as the inner diameter d of the inner end of the outer ring 1. I 0.05 to 0.45%.
[0024]
Further, the slinger 15 is formed by punching a metal plate having excellent corrosion resistance, such as a stainless steel plate (SUS430), having a thickness of, for example, about 0.5 to 0.8 mm (more preferably, about 0.6 mm) by pressing or the like. An inner diameter side cylindrical portion 19 which is integrally formed by performing working and plastic working, and which can be externally fitted and fixed to an outer peripheral surface of an inner end portion of the inner ring 5 which is manufactured by performing a quenching process on bearing steel (SUJ2). Having. The interference between the inner peripheral surface of the inner cylindrical portion 19 and the outer peripheral surface of the inner end of the inner ring 5 is the inner diameter d of both peripheral surfaces in a free state. 19 And outer diameter D 5 (FIG. 1), the outer diameter D of the inner end of the inner ring 5 5 0.05 to 0.45%.
[0025]
On the other hand, as shown in FIG. 3, the sealing device 12b provided between the inner peripheral surface of the outer end of the outer ring 1 and the outer peripheral surface of the intermediate portion of the hub 4 is provided with a core metal 24 formed in an annular shape and a sealing metal. And a member 25. Among these, the core metal 24 is formed by stamping or plastic working on a metal plate such as a cold-rolled steel plate (SPCC) having a thickness of, for example, about 0.5 to 0.8 mm (more preferably, about 0.6 mm). The outer ring 1 has a cylindrical portion 29 which can be fitted and fixed on the inner peripheral surface of the outer end portion. The interference between the outer peripheral surface of the cylindrical portion 29 and the inner peripheral surface of the outer end of the outer ring 1 is the outer diameter D of both peripheral surfaces in a free state. 29 And inner diameter d O (FIG. 1) is defined as the inner diameter d of the outer end of the outer ring 1. O 0.05 to 0.45%.
[0026]
In the case of the present example configured as described above, the outer peripheral surfaces of the outer cylindrical portion 17 and the cylindrical portion 29 of the cored bars 14 and 24 that configure the sealing devices 12a and 12b, and the inner peripheral surfaces of both ends of the outer ring 1 It is possible to properly secure the sealing performance of the fitting portion and prevent entry of moisture such as rainwater, muddy water, and washing water from the fitting portion. Of the above-mentioned sealing devices 12a and 12b, the sealing device 12a, which is a combination seal ring, has a fitting portion between the inner peripheral surface of the inner cylindrical portion 19 of the slinger 15 and the outer peripheral surface of the inner end of the inner ring 5. It is possible to ensure proper sealing performance and to prevent moisture such as rainwater, muddy water, and washing water from entering the fitting portion. Therefore, even when used in harsh environments such as exposure to rainwater, muddy water, washing water, etc., the grease sealed in the rolling bearings deteriorates, and the oil film formed on the rolling contact parts breaks. Thus, the durability of the vehicle hub unit can be sufficiently ensured.
[0027]
It should be noted that the interference between the outer circumferential cylindrical portion 17 of the metal cores 14, 24 and the inner circumferential cylindrical portion 19 of the cylindrical portion 29 and the slinger 15 and the circumferential surfaces of the bearing rings 1, 5 is determined by the interference between the bearing rings 1, 5. In the case where the diameter is less than 0.05% of the diameter of the peripheral surfaces of the cylindrical members 17, 29, 19, the sealing performance of the fitting portion between the peripheral surfaces of the cylindrical portions 17, 29, 19 and the peripheral surfaces of the bearing rings 1, 5 is sufficiently ensured. It is no longer possible, and there is a possibility that moisture such as the rainwater, muddy water, and washing water easily enters the fitting portion. On the other hand, when the interference exceeds 0.45%, when the cylindrical portions 17, 29, 19 are fitted and fixed to the bearing rings 1, 5, the cylindrical portions 17, 29, 19 buckle or the like. Plastic deformation easily occurs, and water such as the rainwater, muddy water, and washing water easily penetrates from this deformed portion.
[0028]
【Example】
An experiment performed by the present inventors to confirm the effects of the present invention will be described. The present invention is, of course, not limited to the examples used in the experiments described below.
The experiment was conducted on a sealing device 12a shown in FIG. 2 provided with a sealing member 16 formed by mixing the respective materials at the compounding ratios shown in Table 1 below. The sealing performance of the sealing device 12a and the sealing device 12a were used. Interference between the outer peripheral surface of the outer cylindrical portion 17 of the cored bar 14 and the inner peripheral surface of the outer ring 1 (a housing 38 described later), which is one of the races for internally fitting and fixing the outer cylindrical portion 17. And examined the relationship. The numerical values shown in Table 1 below indicate parts by weight, respectively.
[0029]
[Table 1]
Figure 2004076784
[0030]
First, materials other than the vulcanization accelerator among the materials shown in Table 1 above were mixed at the ratio shown in Table 1, and the mixed rubber material was mixed using a pressure kneader until the temperature reached 150 ° C. Kneaded. Then, the vulcanization accelerator was added to the obtained kneaded material (rubber cloth) at the ratio shown in Table 1 above, and the rotation speed was 20 min. -1 , 32min -1 The mixture was kneaded with an 8-inch roll rotated at 50 ° C. while maintaining the temperature at 50 ° C., to produce an unvulcanized rubber sheet having a thickness of about 0.8 mm. Next, after cleaning the core metal 14 formed of a cold-rolled steel plate (SPCC) having a thickness of 0.6 mm into a shape shown in FIG. 2 by press molding, a sealing member 16 is attached to a part of the core metal 14. With the adhesive applied to the portion, the cored bar 14 and the unvulcanized rubber sheet are set in the cavity of the mold, and the pressure is set to 4.9 MPa (50 kgf / cm). 2 ), Vulcanization molding was performed at 180 ° C. for 5 minutes. The outer diameter of the outer cylindrical portion 17 of the metal core 14 constituting the sealing device 12a thus formed is 72.022 mm, and the inner diameter of the inner cylindrical portion 19 of the slinger 15 is 59.975 mm. . The slinger 15 is made of a stainless steel plate (SUS430) and has a thickness of 0.6 mm.
[0031]
Then, this sealing device 12a is mounted on a seal rotation tester 33 as shown in FIG. 11, and muddy water 35 is injected to the center of the rotating shaft 34 as shown in FIG. -1 A 500 hour muddy water penetration test was performed. The seal unit rotation tester 35 can rotate the rotation shaft 34 at a predetermined rotation speed in a state where the seal device 12a as a sample is immersed in the muddy water 35 stored inside. The muddy water that has passed through the sealing device 12a can be detected by a leakage sensor 36 provided on the opposite side of the muddy water 35 across the sealing device 12a. Further, the interference between the outer peripheral surface of the outer diameter side cylindrical portion 17 of the cored bar 14 constituting the sealing device 12a and the inner peripheral surface of the housing 37 (corresponding to the outer ring 1) of the seal unit rotation tester 33 is as follows. The inner diameter d of the inner peripheral surface of the housing 37 37 Was adjusted to the desired value. The interference between the outer peripheral surface of the outer diameter side cylindrical portion 17 and the inner peripheral surface of the housing 37 is determined by the inner diameter d of the housing 37. 37 The muddy water infiltration test was carried out while changing variously in the range of 0 to 0.5%. The interference between the inner peripheral surface of the inner cylindrical portion 19 of the slinger 15 and the outer peripheral surface of the rotary shaft 34 is determined by the outer diameter D of the rotary shaft 34. 34 Was set to a constant value (0.12%) within the range of 0.05 to 0.45%. The housing 37 is made of S53CG and has an inner peripheral surface subjected to a high-frequency hardening process, and the rotating shaft 34 has a SUJ2 subjected to a hardening process. Other test conditions are shown below.
Axial eccentricity: 0.1mm TIR or less
Mud composition: JIS Class 8 dust 30%
Grease used: urea compound, mineral oil
Grease application amount: 0.3 g between the outer seal lip 21 and the intermediate seal lip 22 and 0.1 g between the intermediate seal lip 22 and the inner seal lip 23
[0032]
FIG. 12 shows the results of the muddy water penetration test performed under the above-described conditions. As is apparent from the results shown in FIG. 12, the outer diameter of the outer cylindrical portion 17 of the cored bar 14 and the inner diameter d of the inner peripheral surface of the housing 37 constituting the sealing device 12a. 37 With the inner diameter d of the housing 38. 37 The infiltration of muddy water can be prevented for 400 hours or more by adjusting the content to 0.05 to 0.45%. Furthermore, the above-mentioned interference is set to 37 If the content is 0.007 to 0.45%, the infiltration can be prevented for 500 hours or more. In other words, it has been confirmed that by restricting the interference in this way, it is possible to sufficiently secure the durability of the rolling bearing with the sealing device in which the sealing device 12a is assembled.
[0033]
In the above-described embodiment, the sealing device 12a shown in FIG. 2 was used as the sealing device. However, the inventor conducted a similar test using the sealing device 12b shown in FIG. The same result as in the above-described embodiment was obtained. That is, also in the sealing device 12b shown in FIG. 3, the sealing performance of the sealing device 12b and the outer peripheral surface of the cylindrical portion 29 of the core 24 constituting the sealing device 12b and the cylindrical portion 29 are fitted and fixed. The above-described muddy water infiltration test was performed to examine the relationship between the inner ring of the outer ring 1 as one of the raceways and the interference. As a result, the interference between the outer diameter of the cylindrical portion 29 of the core 24 constituting the sealing device 12b and the inner diameter of the inner peripheral surface of the outer ring 1 is set to 0.05 to 0.45% of the inner diameter of the outer ring 1. By doing so, it was confirmed that muddy water could be prevented from entering.
[0034]
【The invention's effect】
Since the rolling bearing with a seal device of the present invention is configured and operates as described above, even when used in a severe environment such as being exposed to rainwater, muddy water, etc., such a rainwater, Water such as muddy water and washing water can be prevented from entering the inside of the rolling bearing. Therefore, the life of a rolling bearing with a sealing device such as a hub unit for an automobile used in such a severe environment can be extended.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view illustrating an example of an embodiment of the present invention.
FIG. 2 is a partially enlarged cross-sectional view showing the sealing device assembled to the right end of FIG.
FIG. 3 is a partially enlarged cross-sectional view showing a sealing device assembled to an intermediate portion in FIG.
FIG. 4 is a sectional view showing a first example of a double-row rolling bearing for constituting an automobile hub unit to which the present invention is applied.
FIG. 5 is a sectional view showing the second example.
FIG. 6 is a sectional view showing a first example of an automobile hub unit for a driven wheel to which the present invention is applied.
FIG. 7 is a sectional view showing the second example.
FIG. 8 is a cross-sectional view showing an example of a double-row rolling bearing for constituting a hub unit for a driven wheel automobile for an object of the present invention.
FIG. 9 is a sectional view similar to FIG. 2, showing a first example of an improved sealing device;
FIG. 10 is a sectional view similar to FIG. 3, showing a second example of the improved sealing device;
FIG. 11 is a cross-sectional view showing a muddy water penetration test apparatus.
FIG. 12 is a graph showing experimental results.
[Explanation of symbols]
1, 1a, 1b, 1c Outer ring
2 Mounting part
3, 3a Inner ring equivalent member
4, 4a, 4b hub
5 Inner ring
6 spline holes
7 Mounting flange
8 Outer ring track
9 Inner ring track
10 rolling elements
11 cage
12a, 12a ', 12b, 12b' Sealing device
13 Space
14, 14a Core
15 Slinger
16, 16a Seal member
17, 17a Outer diameter side cylindrical part
18 Inside circle
19 Inside diameter cylindrical part
20 Outer ring part
21 Outer seal lip
22 Intermediate seal lip
23 Inside Seal Lip
24, 24a cored bar
25, 25a seal member
26 Outer Diameter Side Seal Lip
27 Inner Diameter Side Seal Lip
28 radial seal lip
29, 29a cylindrical part
30 Support plate
31 cylindrical part
32 caulking part
33 Seal rotation tester
34 Rotary axis
35 mud
36 Earth leakage sensor
37 Housing

Claims (2)

内周面に外輪軌道を有する外輪と、外周面に内輪軌道を有する内輪と、これら外輪軌道と内輪軌道との間に転動自在に設けられた複数個の転動体と、上記外輪の内周面と上記内輪の外周面との間に存在して上記各転動体を設置した空間の端部開口を塞ぐシール装置とを備え、このうちのシール装置は、金属製の芯金と弾性材製のシール部材とを有し、このうちの芯金を上記外輪と上記内輪とのうちの一方の軌道輪に保持した状態で、上記シール部材を上記外輪と上記内輪とのうちの他方の軌道輪若しくはこの他方の軌道輪と共にこのシール部材に対し相対回転する部分に全周に亙って摺接させたものであるシール装置付転がり軸受に於いて、上記芯金は上記一方の軌道輪の周面に締り嵌めにより嵌合固定自在の円筒部を有するものであり、この円筒部の周面と上記一方の軌道輪の周面との締め代を、この一方の軌道輪の周面の直径の０．０５〜０．４５％とした事を特徴とするシール装置付転がり軸受。An outer ring having an outer raceway on an inner peripheral surface, an inner racer having an inner raceway on an outer peripheral surface, a plurality of rolling elements rotatably provided between the outer raceway and the inner raceway, and an inner periphery of the outer raceway And a sealing device that is located between the surface and the outer peripheral surface of the inner ring and closes an end opening of a space in which the rolling elements are installed. Among these, the sealing device is made of a metal core metal and an elastic material. The seal member is held by one of the outer race and the inner race in the outer race and the inner race, and the seal member is mounted on the other race of the outer race and the inner race. Alternatively, in a rolling bearing with a seal device, which is slidably contacted over the entire periphery with a portion relatively rotating with respect to the seal member together with the other race, the core metal is formed around the circumference of the one race. It has a cylindrical part that can be fitted and fixed by tight fit on the surface. A rolling device with a sealing device characterized in that the interference between the peripheral surface of the cylindrical portion and the peripheral surface of the one race is 0.05 to 0.45% of the diameter of the peripheral surface of the one race. bearing. シール装置が、芯金とシール部材とスリンガとから成る組み合わせシールリングであり、このうちの芯金の円筒部を、使用時にも回転しない固定側軌道輪となる一方の軌道輪の周面に締り嵌めにより嵌合固定すると共に、上記シール部材を、使用時に回転する回転側軌道輪となる他方の軌道輪と共に回転する上記スリンガに摺接させており、更にこのスリンガは、上記他方の軌道輪の周面に、締り嵌めにより嵌合固定自在の円筒部を有するものであり、この円筒部の周面と上記他方の軌道輪の周面との締め代を、この他方の軌道輪の直径の０．０５〜０．４５％とした、請求項１に記載したシール装置付転がり軸受。The sealing device is a combination seal ring including a core metal, a seal member, and a slinger, and a cylindrical portion of the core metal is fastened to a peripheral surface of one of the race rings that serves as a fixed-side race that does not rotate during use. The fitting and fixing are performed by fitting, and the seal member is brought into sliding contact with the slinger rotating with the other race that becomes the rotating raceway that rotates during use. The peripheral surface has a cylindrical portion which can be fitted and fixed by interference fit, and the interference between the peripheral surface of this cylindrical portion and the peripheral surface of the other race is defined as 0 mm of the diameter of the other race. 2. The rolling bearing with a sealing device according to claim 1, wherein the rolling bearing is set to 0.05 to 0.45%.
JP2002234529A 2002-08-12 2002-08-12 Rolling bearing with sealing device Pending JP2004076784A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006009965A (en) * 2004-06-25 2006-01-12 Nsk Ltd Sealing device for hub unit bearing for wheel
JP2012255549A (en) * 2012-06-27 2012-12-27 Nsk Ltd Bearing unit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006009965A (en) * 2004-06-25 2006-01-12 Nsk Ltd Sealing device for hub unit bearing for wheel
JP2012255549A (en) * 2012-06-27 2012-12-27 Nsk Ltd Bearing unit

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