JP2004293618A - Sealing unit of shell type roller bearing - Google Patents

Sealing unit of shell type roller bearing Download PDF

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Publication number
JP2004293618A
JP2004293618A JP2003084713A JP2003084713A JP2004293618A JP 2004293618 A JP2004293618 A JP 2004293618A JP 2003084713 A JP2003084713 A JP 2003084713A JP 2003084713 A JP2003084713 A JP 2003084713A JP 2004293618 A JP2004293618 A JP 2004293618A
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JP
Japan
Prior art keywords
inner diameter
seal member
shell
roller bearing
type roller
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
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JP2003084713A
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Japanese (ja)
Inventor
Yutaka Shimoda
豊 下田
Yoshitaka Waseda
義孝 早稲田
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Koyo Seiko Co Ltd
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Koyo Seiko Co Ltd
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Publication date
Application filed by Koyo Seiko Co Ltd filed Critical Koyo Seiko Co Ltd
Priority to JP2003084713A priority Critical patent/JP2004293618A/en
Publication of JP2004293618A publication Critical patent/JP2004293618A/en
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
    • F16C33/7803—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members suited for particular types of rolling bearings
    • F16C33/7809—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members suited for particular types of rolling bearings for needle roller bearings
    • 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
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/44—Needle bearings
    • F16C19/46—Needle bearings with one row or needles
    • F16C19/466—Needle bearings with one row or needles comprising needle rollers and an outer ring, i.e. subunit without inner ring

Abstract

<P>PROBLEM TO BE SOLVED: To use a shell type roller bearing without trouble by enabling reassembly of a sealing member for use in a shell type roller bearing corresponding to pressure condition of environments in use. <P>SOLUTION: A sealing unit is provided with an elastically deformable sealing member 5 which is arranged on the inside of outer jaw portions 2c and 2d of the shell type roller bearing 1. The sealing member 5 has a circular trunk portion 51 at an outer diameter side, and an inner diameter portion 53 connected to an inner diameter side of the trunk portion 51 so as to have a recessed groove 54 opened to an one side of an axial direction between the trunk portion 51 and the inner diameter portion 53. A circular recessed portion 5b avoiding interference with an inner surface of a curved portion of an outer ring 2 is formed on an outer periphery of a connecting portion 55 between the trunk portion 51 and the inner diameter portion 53, and a lip 52 having a designated curved shape to either side of an axial direction is formed on an inner periphery of the inner diameter portion 53. Guide surfaces 5c and 5d against an inner ring members S are formed on a tip side and a base end side of the inner diameter portion 53 at an inner periphery, respectively. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、シェル形ころ軸受の密封装置に関する。
【０００２】
【従来の技術】
シェル形針状ころ軸受は、シェル形の外輪と、その内径側に配置される複数の針状ころとを備えるもので、保持器を用いない総ころ形と、保持器付きとの二つのタイプがある。
【０００３】
従来のシェル形針状ころ軸受には、外輪の少なくとも軸方向一端には、内径側に延出する鍔部が形成され、この鍔部の軸方向内側に、芯金付きのシール部材が設けられている（特許文献１参照）。
【０００４】
【特許文献１】
特開２００２−８９５５０号公報
【０００５】
【発明が解決しようとする課題】
従来のシェル形針状ころ軸受において、シール部材は通常、外部からの水や異物の浸入を防止しうるよう外向きに取り付けられているが、シェル形針状ころ軸受は、負圧雰囲気となる環境で使用される場合がある。負圧雰囲気中では、シール部材により、軸受内部から潤滑剤が流出することを防止する必要がある。
【０００６】
上記の場合、シール部材の向きを変えれば、そのシール部材により、潤滑剤の流出を防止しうるようになると考えられる。しかし、従来のシェル形針状ころ軸受に組み込まれているのは、芯金付きのシール部材である。この芯金付きのシール部材は、一旦、外輪の内側に組み込んでしまうと、組み換えは不可能である。そのため、負圧雰囲気中では、シール部材が負圧に対応する向きで予め組み込まれているシェル形針状ころ軸受を使用しなければならない。
【０００７】
本発明は、上記のような現状に対処したもので、シール部材の組み換えにより、通常もしくは加圧雰囲気中でも、負圧雰囲気中でも、不具合なく使用できるようにして、シェル形ころ軸受の汎用性を高めることを課題とする。
【０００８】
【課題を解決するための手段】
上記課題を達成するためには、シール部材として、芯金を含まず弾性変形可能なシール部材を採用すれば、シール部材の取り外し、組み換えが可能となり、シール部材の向きを変更することができるようになると考えられる。しかし、本件発明者が検討したところ、単に、弾性変形可能なシール部材を採用しただけでは、シール部材が傾きやすい、また、シール部材が傾くことで、所期通りのシール効果が得られなくなる、内輪部材の挿入の際に引っ掛かりが生じてリップが反転する、等の種々の不具合が生じることが予想された。
【０００９】
本発明は、前記の検討結果を考慮してなされたもので、シェル形で円筒部の少なくとも軸方向一端に内径側に延出する鍔部を有する外輪と、この外輪の内径側に配置される複数のころとを備えたシェル形ころ軸受に組み込まれる密封装置として、次のような密封装置を構成している。
【００１０】
すなわち、本発明のシェル形ころ軸受の密封装置は、前記鍔部の軸方向内側に設けられる弾性変形可能なシール部材を備え、前記シール部材は、外径側の環状の胴体部と、この胴体部との間に軸方向の一方側に開いた環状の凹溝を有するよう前記胴体部の内径側に連成された内径部とを有し、前記胴体部と前記内径部との連成部の外周には、前記外輪の円筒部から鍔部への湾曲個所の内面との干渉を避けるための環状の凹部が形成され、前記内径部の内周には、軸方向いずれの側に対しても所定の曲率の湾曲形状を有するリップが形成され、前記内径部の内周で前記リップより先端側と基端側とには、それぞれシール部材の内周に挿入される内輪部材に対する案内面が形成されている構成を有している。
【００１１】
上記構成によれば、シール部材は弾性変形が可能であるから、これが外輪の内径側に取り付けられ、鍔部が後曲げ加工された後であっても、取り外して組み換えることができる。この組み換えにより、シール部材の向きを変えることで、使用環境の高圧や負圧の圧力状態に応じたシェル形ころ軸受として使用可能となる。
【００１２】
また、胴体部と内径部との連成部は、径方向に厚みがあって、他の部分より変形しにくく、この部分が、外輪の円筒部から鍔部への湾曲個所の内面と干渉すると、シール部材の全体が傾くおそれがあるが、本発明では、前記連成部の外周に凹部があるので、外輪の湾曲個所の内面との干渉が避けられ、シール部材が傾くことが防止される。また、シール部材は、外輪の湾曲個所の内面と干渉することがないので、これを鍔部の内面に密着した形で設けることができ、このようにシール部材を鍔部内面に密着させることにより、それより軸方向内方では、ころや保持器の占有幅を充分に広くとることができる。
【００１３】
しかも、シール部材が若干傾いた姿勢で取り付けられることになっても、リップの先端は丸みを有するから、内輪部材に対する接触状態にほとんど変化がなく、シール部材に傾きがない場合と同様のシール効果が得られる。
【００１４】
さらに、一般の弾性変形可能なシール部材では、その取り付け向きによっては、軸受内部に内輪部材を差し込む際に、リップ、もしくはリップを一体に有する部分が、内輪部材の先端に引っ掛かって逆方向に捲くれ、反転するおそれがあるが、本発明では、リップを有する内径部の先端側と基端側とにそれぞれ案内面があるので、内輪部材はこれに案内されることになり、内輪部材と内径部との引っ掛かりがなく、リップが反転することがない。また、リップ自体も丸みがあるので、これに内輪部材の先端が引っ掛かることがない。
【００１５】
【発明の実施の形態】
以下、本発明の詳細を図面に基づいて説明すると、図１ないし図３は、本発明の一実施形態に示すもので、図１は、一実施形態に係る密封装置を備えたシェル形針状ころ軸受の軸方向に沿った半断面図で、負圧対応型とされた場合を示している。図２は、図１の密封装置を構成するシール部材の軸方向に沿った断面図、図３は、図１と同一の密封装置を備えたシェル形針状ころ軸受の軸方向に沿った半断面図で、加圧雰囲気対応型とされた場合を示している。
【００１６】
図１において、符号１はシェル形針状ころ軸受の全体を示し、ここでは、保持器付きで、両端開放型のシェル形針状ころ軸受を例示している。符号２はシェル形の外輪、３は針状ころ、４は保持器、５は、密封装置を構成するシール部材である。
【００１７】
外輪２は、一枚の金属板（薄鋼板）から曲げ加工を含む加工工程により製作されるもので、内周に軌道面２ａを有する円筒部２ｂと、この円筒部２ｂの軸方向両端にそれぞれ内径側に向けて延出形成された鍔部２ｃ，２ｄとを有する。両鍔部２ｃ，２ｄのうち、軸方向一端（図において、左端）のものが先曲げの鍔部２ｃであり、円筒部２ｂの軸方向他端にあるのが後曲げの鍔部２ｄである。針状ころ３は、保持器４の各ポケット内に保持された状態で、多数のものが外輪２の内径側に配置されている。
【００１８】
シール部材５は、芯金を有しないタイプで、全体がゴムもしくは合成樹脂等の弾性材のみで構成されていて、弾性変形が可能である。このシール部材５は、本実施形態では２個一対で、互いに同構造で同寸法のものが前記両鍔部２ｃ，２ｄの軸方向内側に互いに内向き（後に説明する凹溝５４が軸方向内方に開く向き）で装着されており、両鍔部２ｃ，２ｄ内側への装着状態では、一対のシール部材５，５は互いに対称形状を呈している。
【００１９】
シール部材５の細部の構造は図２に拡大して示す通りで、シール部材５は、外径側の環状の胴体部５１と、この胴体部５１の内径側と軸方向一方側（図２で左側）において連成されて内周にリップ５２が形成された内径部５３と、この内径部５３と前記胴体部５１との間に軸方向他方側（図２で右側）に開いた形に形成された環状の凹溝５４とを有する。
【００２０】
シール部材５の胴体部５１は、内径部５３より肉厚に成形されており、詳しくは、胴体部５１の厚みは、内径部５３のリップ５２を除く部分の厚みより厚くなっている。また、胴体部５１の外周面は、この胴体部５１が内径部５３と連続する連成部５５の側から軸方向他端に向けて、漸次大径となるテーパ面５ａとなっていて、このテーパ面５ａの全体が外輪円筒部２ｂへのしめしろとして、外輪円筒部２ｂの内周面に圧接するようになっている。
【００２１】
胴体部５１と内径部５３との連成部５５の外周には、シール部材５の肉厚内に凹入した凹部５ｂが胴体部５１の全周にわたって環状に形成されている。この凹部５ｂは、シール部材５が図１に図示の状態で鍔部２ｃ，２ｄの軸方向内側に取り付けられた場合に、シール部材５の一部が、外輪２の円筒部２ｂから鍔部２ｃ，２ｄへと湾曲する個所の内面と干渉しないようにするためのものである。この凹部５ｂがあることで、シール部材５は外輪２の湾曲個所の内面に当たらず、シール部材５の各部分のうち、凹部５ｂに隣り合う部分の表面、すなわち、胴体部５１の外周面と連成部５５の外側面とが、それぞれ外輪円筒部２ｂの内周面と鍔部２ｃ，２ｄの内面とに隙間なく密接するようになっている。
【００２２】
凹溝５４は、断面でほぼＶ字形に開いた形状で、その深さは、シール部材５全体の軸方向幅の２分の１以上の値となっている。このように、凹溝５４が深く、かつ、この凹溝５４より内径側にある内径部５３の肉厚が胴体部５１の肉厚より薄いことから、内径部５３が胴体部５１より径方向に変形しやすく、シール部材５全体に径方向の圧縮力が作用した場合、胴体部５１はほとんど変形、変位せず、これに対して、内径部５３が凹溝５４を狭くする方向に変形するようになっている。
【００２３】
内径部５３の内周には、シール部材５の内部に挿入される内輪部材Ｓの外周面に接触するリップ５２が形成されているが、そのリップ５２は、軸方向いずれの側に対しても所定の曲率の湾曲形状を有している。これにより、シール部材５が若干傾いた姿勢で外輪２内部に取り付けられることになっても、リップ５２は内輪部材Ｓに同じような接触状態で接触するようになっている。
【００２４】
また、内径部５３の内周で前記リップ５２より先端側には、内径部５３の肉厚内に凹入状に湾曲する湾曲面により案内面５ｃが形成されている。この案内面５ｃは、軸受内部に矢印イの方向に挿入される内輪部材Ｓを、引っ掛かりなく軸受内部に案内するためのものである。内輪部材Ｓの先端がこの案内面５ｃに当たることで、内径部５３の全体が外径側に持ち上げられて、内輪部材Ｓの軸受内部への挿入を許容するようになっている。さらに、内径部５３の基端側の内周にも、膨出状の湾曲面により、挿入される内輪部材Ｓに対する案内面５ｄが形成されている。この案内面５ｄも、内径部５３の先端側の案内面５ｃと同様の作用をする。図示の場合、案内面５ｃ，５ｄは、凹の湾曲面もしくは凸の湾曲面で構成されているが、軸方向内方ほど小径となるテーパ面でもよく、挿入される内輪部材Ｓを引っ掛かりなく軸方向内方に案内しうる形状であればよい。
【００２５】
上記の構成において、外輪２の内部で各シール部材５は、内向きとなっているから、負圧雰囲気中において、軸受内部の潤滑剤の外部への流出を確実に防止することができ、このようなシール部材５を有するシェル形針状ころ軸受１は、負圧対応型として使用可能である。
【００２６】
しかも、シール部材５は弾性変形が可能であるから、外輪２内に取り付けられて、鍔部２ｄが後曲げ加工された後であっても、図３に示すように、取り外して組み換えることができる。シール部材５を組み換えてその向きを変えることで、使用環境の圧力状態に応じたシェル形ころ軸受として使用可能となる。
【００２７】
図３に示すシェル形針状ころ軸受１１は加圧雰囲気対応型で、上記した構造のシール部材５が、外輪２の両鍔部２ｃ，２ｄの軸方向内側に互いに外向き、すなわち凹溝５４が軸方向外方に開く向きで組み込まれている。シール部材５の向きが外向きとなっている以外、各部の構成は、図１に図示の構成と変わりはなく、共通する部分には同一の符号を付している。
【００２８】
図３に図示のように、シール部材５が外向きとなっていると、外部からの水や異物の浸入を確実に防止することができる。このようにシール部材５が組み込まれているシェル形針状ころ軸受１１は、通常の雰囲気、もしくは加圧雰囲気中で、使用可能となる。
【００２９】
シール部材５において、胴体部５１と内径部５３との連成部５５は、径方向に厚みがあって、他の部分より変形しにくいが、図１に示すような状態にシール部材５を組み込んでも、連成部５５の外周に凹部５ｂがあるので、連成部５５の外周と外輪２の湾曲個所との干渉が避けられる。そのため、シール部材５が傾くおそれはない。また、シール部材５は、外輪２の湾曲個所の内面と干渉することがないので、これを鍔部２ｃ，２ｄの内面に密着した形で設けることができ、このようにシール部材５を鍔部２ｃ，２ｄ内面に密着させることにより、ころ３や保持器４の占有幅を充分に広くとることができる。
【００３０】
また、たとえシール部材５が若干傾いた姿勢で外輪２内部に取り付けられることになっても、リップ５２の先端は丸みを有するから、内輪部材Ｓに対する接触状態にほとんど変化がなく、シール部材５に傾きがない場合と同様のシール効果が得られる。
【００３１】
さらに、一般の弾性変形可能なシール部材では、その取り付け向きによっては、シール部材の内部に内輪部材Ｓを差し込む際に、リップ、もしくはリップを一体に有する部分が、内輪部材Ｓの先端に引っ掛かって逆方向に捲くれ、反転するおそれがあるが、本発明の上記構成では、リップ５２を有する内径部５３の先端側と基端側とにそれぞれ案内面５ｃ，５ｄがあり、しかも、リップ５２自体に丸みがあるので、内輪部材Ｓはこれに案内されることになり、内輪部材Ｓと内径部５３やリップ５２との引っ掛かりがなく、リップ５２が反転することがない。
【００３２】
なお、上記実施形態では、本発明の密封装置が設けられる軸受として、両端開放型、すなわち、円筒部２ｂの軸方向両端にそれぞれ内径側に延出する鍔部２ｃ，２ｄを有するシェル形針状ころ軸受１を示したが、本発明の密封装置は、円筒部の軸方向一端にのみ鍔部を有する、一端開密閉型のシェル形ころ軸受に設けてもよい。その場合、密封装置を構成するシール部材５が、外輪鍔部の軸方向内側に外向きもしくは内向きの任意の向きで取り付けることができ、しかも、外輪への組み込み後に、その向きを変更しうることは、言うまでもない。
【００３３】
また、本発明の密封装置が設けられる軸受は、保持器を有しない総ころ型のシェル形ころ軸受でもよく、円筒ころのように、針状ころ以外のころを有するシェル形ころ軸受でもよい。
【００３４】
【発明の効果】
本発明によれば、シール部材が外輪内に取り付けられて、鍔部が後曲げ加工された後であっても、シール部材を組み換えて、その向きを変えることができる。そのため、本発明の密封装置を備えた同一のシェル形ころ軸受が、使用環境の圧力状態に応じて負圧対応型としても、加圧雰囲気対応型としても使用可能となり、シェル形ころ軸受の汎用性が増す。
【００３５】
また、弾性変形可能なシール部材を採用するにも拘わらず、このようなシール部材で発生するおそれがある不具合、すなわち、シール部材が傾きやすい、また、シール部材の傾きに伴い、所期通りのシール効果が得られない、内輪部材の挿入の際に引っ掛かりが生じてリップが反転する、といった不具合が発生しない。
【図面の簡単な説明】
【図１】本発明の一実施形態に係る密封装置を備えたシェル形針状ころ軸受の軸方向に沿った半断面図で、負圧対応型とされた場合を示している。
【図２】図１の密封装置を構成するシール部材の軸方向に沿った拡大断面図である。
【図３】図１と同一の密封装置を備えたシェル形針状ころ軸受の軸方向に沿った半断面図で、加圧雰囲気対応型とされた場合を示している。
【符号の説明】
１ シェル形針状ころ軸受
２ 外輪
２ｂ 円筒部
２ｃ，２ｄ 鍔部
５ シール部材
５１ 胴体部
５２ リップ
５３ 内径部
５４ 凹溝
５５ 連成部
５ｂ 凹部
５ｃ，５ｄ 案内面[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a sealing device for a shell type roller bearing.
[0002]
[Prior art]
Shell type needle roller bearings are provided with a shell type outer ring and a plurality of needle rollers arranged on the inner diameter side thereof.There are two types, a full roller type without a cage and a type with a cage. There is.
[0003]
In the conventional shell-shaped needle roller bearing, at least one end in the axial direction of the outer ring is formed with a flange portion extending to the inner diameter side, and a seal member with a metal core is provided inside the flange portion in the axial direction. (See Patent Document 1).
[0004]
[Patent Document 1]
JP-A-2002-89550 [0005]
[Problems to be solved by the invention]
In conventional shell-shaped needle roller bearings, the seal member is usually mounted outward so as to prevent intrusion of water or foreign matter from the outside, but the shell-shaped needle roller bearing has a negative pressure atmosphere. May be used in the environment. In a negative pressure atmosphere, it is necessary to prevent the lubricant from flowing out from the inside of the bearing by the seal member.
[0006]
In the above case, if the direction of the seal member is changed, it is considered that the seal member can prevent the lubricant from flowing out. However, what is incorporated in the conventional shell needle roller bearing is a seal member with a cored bar. Once this seal member with a cored bar has been assembled inside the outer race, it cannot be rearranged. Therefore, in a negative pressure atmosphere, it is necessary to use a shell-type needle roller bearing in which the sealing member is previously installed in a direction corresponding to the negative pressure.
[0007]
The present invention addresses the above-mentioned current situation, and enhances the versatility of the shell-type roller bearing by changing the seal member so that the seal member can be used without any problem in a normal or pressurized atmosphere, even in a negative pressure atmosphere. That is the task.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, by adopting an elastically deformable seal member that does not include a metal core as the seal member, the seal member can be removed and rearranged, and the direction of the seal member can be changed. It is thought to be. However, the present inventor has studied and found that simply using an elastically deformable seal member makes it easy for the seal member to tilt, and that the seal member is tilted, so that the expected sealing effect cannot be obtained. It was expected that various problems would occur, such as that the inner ring member was caught when inserted and the lip was inverted.
[0009]
The present invention has been made in consideration of the above-described examination results, and has an outer ring having a shell shape and a flange portion extending at least at one axial end of the cylindrical portion toward the inner diameter side, and is disposed on the inner diameter side of the outer ring. The following sealing device is configured as a sealing device incorporated in a shell-type roller bearing having a plurality of rollers.
[0010]
That is, the sealing device for a shell-type roller bearing of the present invention includes an elastically deformable seal member provided on the inner side in the axial direction of the flange portion, wherein the seal member has an outer diameter side annular body portion, An inner diameter portion coupled to the inner diameter side of the body portion so as to have an annular concave groove opened on one side in the axial direction between the body portion and the coupling portion between the body portion and the inner diameter portion. An annular recess is formed on the outer periphery of the outer ring to avoid interference with the inner surface of the curved portion from the cylindrical portion of the outer ring to the flange portion. A lip having a curved shape with a predetermined curvature is also formed, and a guide surface for an inner ring member inserted into the inner periphery of the seal member is provided on the inner periphery of the inner diameter portion on the distal side and the proximal end side of the lip. It has a configuration that has been formed.
[0011]
According to the above configuration, since the seal member can be elastically deformed, it can be detached and recombined even after the seal member is attached to the inner diameter side of the outer ring and the flange portion is post-bent. By changing the direction of the seal member by this recombination, the seal member can be used as a shell-type roller bearing corresponding to a high pressure state or a negative pressure state of a use environment.
[0012]
In addition, the coupling portion between the body portion and the inner diameter portion is thicker in the radial direction and is less likely to deform than other portions, and if this portion interferes with the inner surface of the curved portion from the cylindrical portion of the outer ring to the flange portion. Although there is a possibility that the entirety of the seal member may be inclined, in the present invention, since there is a concave portion on the outer periphery of the coupling portion, interference with the inner surface of the curved portion of the outer ring is avoided, and the seal member is prevented from being inclined. . In addition, since the seal member does not interfere with the inner surface of the curved portion of the outer ring, it can be provided in a form in which the seal member is in close contact with the inner surface of the flange portion. On the inner side in the axial direction, the occupied width of the rollers and the cage can be made sufficiently large.
[0013]
Moreover, even if the seal member is mounted in a slightly inclined posture, the tip of the lip is rounded, so that the contact state with the inner ring member hardly changes, and the same sealing effect as when the seal member is not inclined. Is obtained.
[0014]
Further, in a general elastically deformable seal member, depending on the mounting direction, when the inner ring member is inserted into the bearing, the lip or a portion integrally formed with the lip is caught by the tip of the inner ring member and wound in the opposite direction. However, in the present invention, the inner ring member is guided by the guide surfaces on the distal end side and the base end side of the inner diameter portion having the lip. There is no catch with the part, and the lip is not inverted. Further, since the lip itself is rounded, the tip of the inner ring member does not get caught on the lip.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
The details of the present invention will be described below with reference to the drawings. FIGS. 1 to 3 show one embodiment of the present invention, and FIG. 1 shows a shell-like needle-like shape provided with a sealing device according to one embodiment. FIG. 4 is a half cross-sectional view along the axial direction of the roller bearing, showing a case where the roller bearing is of a negative pressure compatible type. FIG. 2 is an axial sectional view of a sealing member constituting the sealing device of FIG. 1, and FIG. 3 is a half-axial view of a shell-type needle roller bearing provided with the same sealing device as that of FIG. The cross-sectional view shows a case in which the pressurized atmosphere compatible type is set.
[0016]
In FIG. 1, reference numeral 1 indicates the entirety of a shell-type needle roller bearing. Here, a shell-type needle roller bearing with a retainer and open at both ends is exemplified. Reference numeral 2 is a shell-shaped outer ring, 3 is a needle roller, 4 is a retainer, and 5 is a sealing member constituting a sealing device.
[0017]
The outer ring 2 is manufactured by a processing step including bending from a single metal plate (thin steel plate). The outer ring 2 has a cylindrical portion 2b having a raceway surface 2a on its inner periphery and two axial ends of the cylindrical portion 2b. And flange portions 2c and 2d extending toward the inner diameter side. One of the two flanges 2c and 2d in the axial direction (the left end in the figure) is a front bent flange 2c, and the other end in the axial direction of the cylindrical portion 2b is a rear bent flange 2d. . A large number of the needle rollers 3 are arranged on the inner diameter side of the outer ring 2 while being held in each pocket of the retainer 4.
[0018]
The sealing member 5 is a type having no core metal, and is entirely composed of only an elastic material such as rubber or synthetic resin, and is capable of elastic deformation. In this embodiment, a pair of the seal members 5 have the same structure and the same size and are inwardly inward in the axial direction of the flanges 2c and 2d. (A direction in which the seal members 5 and 5 open), and in a state of being fitted inside the two flange portions 2c and 2d, the pair of seal members 5 and 5 have a symmetric shape with each other.
[0019]
The detailed structure of the seal member 5 is shown in an enlarged manner in FIG. 2. The seal member 5 has an annular body portion 51 on the outer diameter side, and an inner diameter side of the body portion 51 and one side in the axial direction (FIG. An inner diameter portion 53 which is coupled to the left side) and has a lip 52 formed on the inner periphery, and is formed between the inner diameter portion 53 and the body portion 51 so as to be opened to the other axial side (the right side in FIG. 2). And an annular groove 54 formed.
[0020]
The body portion 51 of the seal member 5 is formed to be thicker than the inner diameter portion 53. More specifically, the thickness of the body portion 51 is larger than the thickness of the inner diameter portion 53 except for the lip 52. Further, the outer peripheral surface of the body portion 51 is a tapered surface 5a having a gradually increasing diameter from the side of the coupling portion 55 where the body portion 51 is continuous with the inner diameter portion 53 toward the other end in the axial direction. The entire tapered surface 5a is pressed against the inner peripheral surface of the outer ring cylindrical portion 2b as an interference with the outer ring cylindrical portion 2b.
[0021]
On the outer periphery of the coupling portion 55 between the body portion 51 and the inner diameter portion 53, a concave portion 5b recessed into the thickness of the seal member 5 is formed in an annular shape over the entire periphery of the body portion 51. When the seal member 5 is attached to the inside of the flanges 2c and 2d in the axial direction in the state shown in FIG. 1, a part of the seal member 5 moves from the cylindrical portion 2b of the outer race 2 to the flange 2c. , 2d so as not to interfere with the inner surface of the curved portion. Due to the presence of the concave portion 5b, the seal member 5 does not hit the inner surface of the curved portion of the outer race 2, and the surface of the portion of the seal member 5 adjacent to the concave portion 5b, that is, the outer peripheral surface of the body portion 51 The outer surface of the coupling portion 55 is in close contact with the inner peripheral surface of the outer ring cylindrical portion 2b and the inner surfaces of the flange portions 2c and 2d without any gap.
[0022]
The concave groove 54 has a shape that is substantially V-shaped in cross section, and has a depth equal to or more than half the axial width of the entire seal member 5. As described above, since the concave groove 54 is deep and the thickness of the inner diameter portion 53 located on the inner diameter side of the concave groove 54 is smaller than the thickness of the body portion 51, the inner diameter portion 53 is more radially than the body portion 51. When the radially compressive force acts on the entire sealing member 5, the body portion 51 is hardly deformed or displaced, whereas the inner diameter portion 53 is deformed in a direction to narrow the groove 54. It has become.
[0023]
A lip 52 is formed on the inner circumference of the inner diameter portion 53 so as to be in contact with the outer circumferential surface of the inner race member S inserted into the inside of the seal member 5. It has a curved shape with a predetermined curvature. Thus, even when the seal member 5 is mounted inside the outer race 2 in a slightly inclined posture, the lip 52 comes into contact with the inner race member S in a similar contact state.
[0024]
Further, a guide surface 5c is formed on the inner periphery of the inner diameter portion 53 on the tip side of the lip 52 by a curved surface which is concavely curved within the thickness of the inner diameter portion 53. The guide surface 5c is for guiding the inner ring member S inserted into the bearing in the direction of arrow A into the bearing without being caught. When the tip of the inner ring member S hits the guide surface 5c, the entire inner diameter portion 53 is lifted to the outer diameter side, and the inner ring member S is allowed to be inserted into the bearing. Further, a guide surface 5d for the inner ring member S to be inserted is also formed on the inner circumference on the base end side of the inner diameter portion 53 by a bulging curved surface. The guide surface 5d also functions similarly to the guide surface 5c on the tip side of the inner diameter portion 53. In the illustrated case, the guide surfaces 5c and 5d are formed of concave curved surfaces or convex curved surfaces. However, the guide surfaces 5c and 5d may be tapered surfaces having a smaller diameter toward the inner side in the axial direction. Any shape may be used as long as it can guide inward in the direction.
[0025]
In the above configuration, since each seal member 5 faces inward inside the outer ring 2, it is possible to reliably prevent the lubricant inside the bearing from flowing out to the outside in a negative pressure atmosphere. The shell-shaped needle roller bearing 1 having such a sealing member 5 can be used as a negative pressure-compatible type.
[0026]
Moreover, since the seal member 5 can be elastically deformed, it can be removed and rearranged as shown in FIG. 3 even after the seal member 5 is mounted in the outer race 2 and the flange portion 2d is post-bent. it can. By rearranging the seal member 5 and changing its direction, it becomes possible to use it as a shell-type roller bearing according to the pressure state of the use environment.
[0027]
The needle needle roller bearing 11 shown in FIG. 3 is of a pressurized atmosphere-compatible type. Are installed so as to open outward in the axial direction. Except that the direction of the seal member 5 is outward, the configuration of each part is the same as the configuration shown in FIG. 1, and common parts are denoted by the same reference numerals.
[0028]
As shown in FIG. 3, when the seal member 5 faces outward, intrusion of water or foreign matter from the outside can be reliably prevented. The shell needle roller bearing 11 in which the seal member 5 is incorporated as described above can be used in a normal atmosphere or a pressurized atmosphere.
[0029]
In the seal member 5, the coupling portion 55 between the body portion 51 and the inner diameter portion 53 has a thickness in the radial direction and is less likely to be deformed than other portions, but the seal member 5 is assembled in a state as shown in FIG. However, since the concave portion 5b is provided on the outer periphery of the coupling portion 55, interference between the outer periphery of the coupling portion 55 and the curved portion of the outer ring 2 can be avoided. Therefore, there is no possibility that the sealing member 5 is inclined. Further, since the seal member 5 does not interfere with the inner surface of the curved portion of the outer race 2, it can be provided in a form in which it is in close contact with the inner surfaces of the flanges 2c and 2d. By closely contacting the inner surfaces of the rollers 2c and 2d, the occupied width of the rollers 3 and the retainer 4 can be made sufficiently large.
[0030]
Even if the seal member 5 is mounted inside the outer ring 2 in a slightly inclined posture, the tip of the lip 52 is rounded, so that the state of contact with the inner ring member S hardly changes. The same sealing effect as when there is no inclination can be obtained.
[0031]
Furthermore, in a general elastically deformable seal member, when inserting the inner ring member S into the inside of the seal member, the lip or a portion integrally having the lip is hooked on the tip of the inner ring member S depending on the mounting direction. In the above configuration of the present invention, there are guide surfaces 5c and 5d on the distal end side and the proximal end side of the inner diameter portion 53 having the lip 52, respectively. Since the inner ring member S is guided by the inner ring member S, the inner ring member S is not caught between the inner ring member S and the inner diameter portion 53 or the lip 52, and the lip 52 is not inverted.
[0032]
In the above-described embodiment, the bearing provided with the sealing device of the present invention is of a shell-type needle type having both ends open, that is, shell-shaped needles having flanges 2c and 2d extending radially inward at both axial ends of the cylindrical portion 2b. Although the roller bearing 1 has been described, the sealing device of the present invention may be provided in a shell roller bearing of an open-end closed type having a flange portion only at one axial end of a cylindrical portion. In that case, the sealing member 5 constituting the sealing device can be attached to the inside of the outer ring flange in the axial direction in any direction, either outward or inward, and the orientation can be changed after being incorporated into the outer ring. It goes without saying that.
[0033]
Further, the bearing provided with the sealing device of the present invention may be a full-roller type shell roller bearing having no retainer, or may be a shell-type roller bearing having rollers other than needle rollers, such as cylindrical rollers.
[0034]
【The invention's effect】
According to the present invention, even after the seal member is mounted in the outer race and the flange portion is post-bent, the direction of the seal member can be changed by rearranging the seal member. Therefore, the same shell roller bearing provided with the sealing device of the present invention can be used as a negative pressure type or a pressurized atmosphere type according to the pressure state of the operating environment. The nature increases.
[0035]
Further, despite the adoption of an elastically deformable seal member, a problem that may occur in such a seal member, that is, the seal member is easily inclined, and with the inclination of the seal member, Problems such as the inability to obtain a sealing effect and the inversion of the lip due to catching during insertion of the inner ring member do not occur.
[Brief description of the drawings]
FIG. 1 is a half-sectional view along the axial direction of a shell-type needle roller bearing provided with a sealing device according to one embodiment of the present invention, and shows a case where the needle-type roller bearing is of a negative pressure compatible type.
FIG. 2 is an enlarged sectional view along the axial direction of a sealing member constituting the sealing device of FIG.
FIG. 3 is a half sectional view along the axial direction of a shell-type needle roller bearing provided with the same sealing device as that of FIG. 1 and shows a case where the bearing is adapted to a pressurized atmosphere.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shell-shaped needle roller bearing 2 Outer ring 2b Cylindrical part 2c, 2d Flange part 5 Seal member 51 Body part 52 Lip 53 Inner part 54 Recessed groove 55 Coupling part 5b Recess 5c, 5d Guide surface

Claims (2)

シェル形で円筒部の少なくとも軸方向一端に内径側に延出する鍔部を有する外輪と、この外輪の内径側に配置される複数のころとを備えたシェル形ころ軸受に組み込まれる密封装置であって、
前記鍔部の軸方向内側に設けられる弾性変形可能なシール部材を備え、
前記シール部材は、外径側の環状の胴体部と、この胴体部との間に軸方向の一方側に開いた環状の凹溝を有するよう前記胴体部の内径側に連成された内径部とを有し、
前記胴体部と前記内径部との連成部の外周には、前記外輪の円筒部から鍔部への湾曲個所の内面との干渉を避けるための環状の凹部が形成され、
前記内径部の内周には、軸方向いずれの側に対しても所定の曲率の湾曲形状を有するリップが形成され、
前記内径部の内周で前記リップより先端側と基端側とには、それぞれシール部材の内周に挿入される内輪部材に対する案内面が形成されている、
ことを特徴とするシェル形ころ軸受の密封装置。A sealing device incorporated in a shell-type roller bearing including a shell-shaped outer ring having at least one axial end of a cylindrical portion and a flange extending radially inward, and a plurality of rollers disposed on the radially inner side of the outer ring. So,
An elastically deformable seal member provided on the axially inner side of the flange portion,
The seal member has an annular body portion on the outer diameter side and an inner diameter portion coupled to the inner diameter side of the body portion so as to have an annular concave groove opened on one side in the axial direction between the body portion. And having
An annular concave portion is formed on the outer periphery of the coupling portion between the body portion and the inner diameter portion to avoid interference with the inner surface of the curved portion from the cylindrical portion of the outer ring to the flange portion,
On the inner circumference of the inner diameter portion, a lip having a curved shape with a predetermined curvature is formed on any side in the axial direction,
On the inner periphery of the inner diameter portion, on the distal side and the proximal end side of the lip, a guide surface for an inner ring member inserted into the inner periphery of the seal member is formed,
Sealing device for shell type roller bearings, characterized in that: 請求項１に記載のシェル形ころ軸受の密封装置において、
前記シェル形ころ軸受は、円筒部の軸方向両端にそれぞれ内径側に延出する鍔部を有する外輪を備え、前記シール部材は２個一対で、互いに逆向きで前記外輪の両鍔部の軸方向内側にそれぞれ設けられているシェル形ころ軸受の密封装置。The sealing device for a shell-type roller bearing according to claim 1,
The shell-type roller bearing includes an outer ring having a flange portion extending radially inward at both ends in the axial direction of the cylindrical portion, and the seal member is a pair of two seal members. Sealing devices for shell type roller bearings provided on the inner side in each direction.
JP2003084713A 2003-03-26 2003-03-26 Sealing unit of shell type roller bearing Pending JP2004293618A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007064308A (en) * 2005-08-30 2007-03-15 Ntn Corp Coreless seal for assembling shell type roller bearing, and shell type roller bearing
WO2007029596A1 (en) 2005-09-07 2007-03-15 Ntn Corporation Coreless seal and rolling bearing
JP2007071304A (en) * 2005-09-07 2007-03-22 Ntn Corp Core metal-less seal and rolling bearing
JP2007071303A (en) * 2005-09-07 2007-03-22 Ntn Corp Core metal-less seal built into shell type roller bearing
WO2008056440A1 (en) * 2006-11-08 2008-05-15 Ntn Corporation Support structure for suspension device
WO2013020726A1 (en) * 2011-08-10 2013-02-14 Schaeffler Technologies AG & Co. KG Radial-roller antifriction bearing arrangement, in particular for a needle sleeve
JP2014521903A (en) * 2011-08-10 2014-08-28 シェフラー テクノロジーズ ゲー・エム・ベー・ハー ウント コー． カー・ゲー Radial roller bearing device, especially for shell needle roller bearings
US20190072133A1 (en) * 2017-09-05 2019-03-07 Schaeffler Technologies AG & Co. KG Bearing assembly with an integrated seal

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007064308A (en) * 2005-08-30 2007-03-15 Ntn Corp Coreless seal for assembling shell type roller bearing, and shell type roller bearing
WO2007029596A1 (en) 2005-09-07 2007-03-15 Ntn Corporation Coreless seal and rolling bearing
JP2007071304A (en) * 2005-09-07 2007-03-22 Ntn Corp Core metal-less seal and rolling bearing
JP2007071303A (en) * 2005-09-07 2007-03-22 Ntn Corp Core metal-less seal built into shell type roller bearing
US8262291B2 (en) 2005-09-07 2012-09-11 Ntn Corporation Coreless seal and rolling bearing
WO2008056440A1 (en) * 2006-11-08 2008-05-15 Ntn Corporation Support structure for suspension device
WO2013020726A1 (en) * 2011-08-10 2013-02-14 Schaeffler Technologies AG & Co. KG Radial-roller antifriction bearing arrangement, in particular for a needle sleeve
JP2014521903A (en) * 2011-08-10 2014-08-28 シェフラー テクノロジーズ ゲー・エム・ベー・ハー ウント コー． カー・ゲー Radial roller bearing device, especially for shell needle roller bearings
US9145921B2 (en) 2011-08-10 2015-09-29 Schaeffler Technologies AG & Co. KG Radial-roller antifriction bearing arrangement, in particular for a needle sleeve
US20190072133A1 (en) * 2017-09-05 2019-03-07 Schaeffler Technologies AG & Co. KG Bearing assembly with an integrated seal
US10563698B2 (en) * 2017-09-05 2020-02-18 Schaeffler Technologies AG & Co. KG Bearing assembly with an integrated seal

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