JP4453264B2 - Shell roller bearing - Google Patents

Shell roller bearing Download PDF

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Publication number
JP4453264B2
JP4453264B2 JP2003084715A JP2003084715A JP4453264B2 JP 4453264 B2 JP4453264 B2 JP 4453264B2 JP 2003084715 A JP2003084715 A JP 2003084715A JP 2003084715 A JP2003084715 A JP 2003084715A JP 4453264 B2 JP4453264 B2 JP 4453264B2
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Japan
Prior art keywords
outer ring
axial direction
roller bearing
seal member
shell
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JP2004293620A (en
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初 栗木
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JTEKT Corp
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JTEKT Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—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

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

Description

【０００１】
【発明の属する技術分野】
本発明は、シェル形ころ軸受に関する。
【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。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ている。シール部材は、この鍔部の軸方向内側に設けられている。
【０００３】
従来のシェル形針状ころ軸受において、前記鍔部は、外輪の円筒部の端部を、内径側からの切削やプレス等で薄肉とした上で、この薄肉部分を内径側に曲げ加工することで、形成されている（特許文献１参照）。これは、外輪の内部に組み込まれた保持器やころ、シール部材等の抜け出しを防止するためである。
【０００４】
鍔部は、前記したように、外輪の薄肉部分で形成されるので、その軸方向内側には、軌道面より外輪の板厚内に凹入した内周溝が円筒部の周方向に沿って形成される。従来、この内周溝が、シール部材の収納部として利用される。この場合、シール部材は通常、芯金を有するタイプである。
【０００５】
【特許文献１】
特開２００２−８９５５０号公報
【０００６】
【発明が解決しようとする課題】
両端開放型のシェル形針状ころ軸受では、外輪の円筒部の軸方向両端に鍔部が形成され、これら両鍔部の軸方向内側にそれぞれシール部材が取り付けられるようになっている。前記両鍔部のうち、一方の鍔部は、先曲げの鍔部と称されるもので、円筒部とほぼ同じ板厚を有する。他方の鍔部は、後曲げの鍔部と称され、前記先曲げの鍔部を有する外輪の内部に保持器やころ、シール部材を組み込んだ後に、円筒部の薄肉部分を曲げ加工して形成される。このような軸受には、芯金を含まず、ゴムや合成樹脂等の弾性材のみからなるシール部材を用いることが考えられている。
【０００７】
ところが、外輪の軸方向両側に、それぞれ芯金なしのシール部材を組み込もうとすると、このシール部材は、芯金付きのシール部材に比べ、剛性が低いので、次のような問題が生じる。すなわち、図３にも示すように、外輪２２の先曲げの鍔部２２ｃの軸方向内側では、シール部材２３は、軌道面２２ａと同一内径の円筒部２２ｂ内周面に取り付けられるが、他方のシール部材２４は、後曲げの鍔部２２ｄの軸方向内側で、内周溝２５の内部に取り付けられる。両シール部材２３，２４が芯金なしで、同寸法のものとすると、両シール部材２３，２４の取り付け位置の間に径方向のずれＤが生じる。
【０００８】
後曲げの鍔部２２ｄ側に設けられるシール部材２４については、外輪２２へのしめしろが不足し、前記鍔部２２ｄの後曲げ加工の際に傾くことがある。また、両シール部材２３，２４の間では、リップの内径寸法にも違いが生じ、内輪となる部材に対するしめしろも異なってくる。このため、所期通りのシール効果が得られなくなる。
【０００９】
これに対しては、外輪の軸方向両側に寸法の異なるシール部材を取り付ければよいが、そうすると、使用する部品の種類が増えてコストが嵩むほか、各鍔部の内側に、対応した寸法のシール部材を選択して取り付けることになるので、間違う可能性があって手間がかかり、組み込みの作業効率が低下する。
【００１０】
本発明は、上記の従来の問題に対処したもので、芯金なしのシール部材であって、同一寸法のものを外輪の軸方向両側に使用できるようにして、コストの削減と、組み込み作業の効率化とを図ることを課題とする。
【００１１】
【課題を解決するための手段】
本発明は、上述課題を解決するために、シェル形で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と、この外輪の内径側に配置される複数のころと、前記両鍔部の軸方向内側に設けられる一対で互いに対称形状のシール部材とを備え、前記両鍔部のうち、外輪の薄肉部分で形成される後曲げの鍔部の軸方向内側には、軌道面より外輪の板厚内に凹入する内周溝が円筒部の周方向に沿って形成されて、この内周溝の軸方向幅が、前記シール部材の軸方向幅より狭い幅に設定され、前記後曲げの鍔部側のシール部材は、前記内周溝に隣り合って軌道面と同一内径である円筒部内周面に圧接させて嵌着されているとともに、前記シール部材のそれぞれは、軸方向内側のその外周部に前記外輪に対する嵌合時のしめしろとなる膨出部が形成されているシェル形ころ軸受を構成している。
【００１２】
上記構成によれば、外輪の軸方向両側にそれぞれ設けられるシール部材は、いずれも軌道面と同一内径の円筒部内周面に取り付けられる。この場合、シール部材は芯金付きのものであっても、芯金を有しないものであってもよいが、特に、芯金を有しないシール部材である場合、両シール部材が同寸法のものであると、外輪の軸方向両側において、シール部材の外輪に対するしめしろは互いに等しくなり、後曲げの鍔部側のシール部材が、該鍔部の後曲げ加工の際に傾くようなことがない。また、各シール部材のリップ部分の内径も互いに等しくなり、同一のしめしろで内輪となる部材の外周面に接することになる。これで、所期通りのシール効果が得られる。
【００１３】
この結果、外輪の軸方向両側には、芯金を有しないシール部材であって、同寸法のものを採用して、軸受として支障なく使用することができる。
【００１４】
【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。図１および図２は、参考例の実施形態を示すものである。本発明に係る実施形態は図３に示す。まず、参考例の実施形態を説明する。図１は、一実施形態に係るシェル形針状ころ軸受の軸方向に沿った半断面図、図２は、図１のシェル形針状ころ軸受の要部を分解して示した拡大断面図である。これらの図には、保持器付きのシェル形針状ころ軸受を例示している。
【００１５】
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、２はシェル形の外輪、３は針状ころ、４は保持器、５，６はシール部材である。シェル形の外輪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とほぼ同じ板厚を有する。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。この後曲げの鍔部２ｄは、円筒部２ｂの一端部を内径側からの切削もしくはプレス等より薄肉にした上で、その薄肉部分を曲げ加工することで、形成されている。したがって、この後曲げの鍔部２ｄの軸方向内側には、軌道面２ａより円筒部２ｂの板厚内に凹入した内周溝７が円筒部２ｂの周方向に沿って形成されている。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。
【００１６】
シール部材５，６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逆向きで装着されている。両鍔部２ｃ，２ｄ内への装着状態では、一対のシール部材５，６は、互いに対称形状を呈している。図示の例では、シール部材５，６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で構成されている。各シール部材５，６は、肉厚の外径部５ａ，６ａと、この外径部５ａ，６ａから内径側に斜めに延出するリップ部５ｂ，６ｂとからなり、外径部５ａ，６ａとリップ部５ｂ，６ｂとの間に軸方向に凹入する環状の凹溝５ｃ，６ｃが形成されている。
【００１７】
外輪２の内径側においては、軌道面２ａと同一内径Ｒの円筒部２ｂ内周面が、後曲げの鍔部２ｄの側に拡幅延長されて、内周溝７は狭幅となっている。そして、この内周溝７の軸方向幅Ｗ７は、シール部材５，６の軸方向幅Ｗｓより狭い幅になっている（Ｗ７＜Ｗｓ）。望ましくは、内周溝７の軸方向幅Ｗ７は、シール部材５，６の軸方向幅Ｗｓの半分以下の幅である。
【００１８】
後曲げの鍔部２ｄの軸方向内側では、内周溝７に隣り合う個所で、シール部材６は、その外径部６ａを軌道面２ａと同一内径Ｒの円筒部２ｂ内周面に圧接させることで嵌着されている。なお、後曲げの鍔部２ｄは、円筒部２ｂの一端の薄肉部分を小さい曲率半径で曲げ加工することで、形成されており、前記曲げ加工による変形が内周溝７より軸方向内側に及ばないようにされている。
【００１９】
上記構成によれば、シール部材５，６は、いずれも軌道面２ａと同一内径Ｒの円筒部２ｂ内周面に取り付けられることになる。この場合、内周溝７の軸方向幅Ｗ７が、シール部材５，６の軸方向幅Ｗｓの半分以下の幅であると、後曲げの鍔部２ｄ側のシール部材６は、その外周部の過半部が、内周溝７に隣り合う円筒部２ｂ内周面に圧接するので、シール部材６の全体が円筒部２ｂ内周面に支持されることになり、内周溝７に嵌まり込んだり、内周溝７に一部入り込んだ形で傾いたりすることがない。
【００２０】
シール部材５，６がいずれも円筒部２ｂ内周面に取り付けられることで、外輪２の軸方向両側において、各シール部材５，６の外輪２に対するしめしろは互いに等しくなる。後曲げの鍔部２ｄ側のシール部材６は、先曲げの鍔部２ｃ側のシール部材５と同様に、円筒部２ｂ内周面に嵌着し、嵌着状態が強固で、鍔部２ｄの後曲げ加工の際に傾くようなことがない。また、各シール部材５，６のリップ部分５ｂ，６ｂの内径も互いに等しくなるので、同一のしめしろで内輪となる部材の外周面に接することになる。このため、外輪２の軸方向両側において、所期通りのシール効果が得られる。
【００２１】
図１および図２には、シェル形ころ軸受の参考例として、後曲げの鍔部２ｄ側のシール部材６について、その外周部が軸方向に沿って平坦な形状のものを示した。図３には、本発明に係るシェル形ころ軸受の一実施形態を示す。図３は、本発明に係るシェル形針状ころ軸受の要部を分解して示した断面図である。
【００２２】
図３のシール部材６２では、外周部の各部のうち、軸方向内側部に、外輪２へのしめしろとなる膨出部６ｄが形成されている。シール部材６２の他の構成は、図１および図２に図示のシール部材５，６と同じでよく、対応する部分には同一の符号を付している。
【００２３】
上記構成では、膨出部６ｄの外輪２側への圧接により、シール部材６２が軌道面２ａと同一内径Ｒの円筒部２ｂ内周面に、該内周面に沿った姿勢で強固に取り付けられ、内周溝７に嵌まり込んだり、内周溝７に一部入り込んだ形で傾いたりすることがない。この場合、内周溝７の軸方向幅Ｗ７は、必ずしもシール部材５，６の軸方向幅Ｗｓの半分以下の幅である必要はなく、膨出部６ｄが内周溝７より軸方向内側に位置するのであれば、内周溝７の軸方向幅Ｗ７は、シール部材６２の軸方向幅Ｗｓの半分を超える広幅であってもよい。
【００２４】
図示の実施形態においては、保持器４付きのシェル形針状ころ軸受１を示したが、本発明は、保持器を有しない、総ころタイプのシェル形針状ころ軸受にも実施することができる。また、ころは針状ころ３に限らず、円筒ころであってもよい。外輪２の軸方向両側に設けられるシール部材５は、芯金なしで、図示のものとは断面形状が異なるシール部材であってもよいし、芯金付きのシール部材であってもよい。
【００２５】
【発明の効果】
本発明によれば、芯金なしのシール部材を採用して、しかも、外輪の軸方向両側で互いに対称形状で同一寸法のものを支障なく使用しうるから、コストの削減が可能となるばかりか、両鍔部の内側の形状に合わせて、対応する寸法のシール部材を選択し取り付ける必要がないので、シール部材の組み込み作業を効率よく行える。
【図面の簡単な説明】
【図１】参考例の実施形態に係るシェル形針状ころ軸受の軸方向に沿った半断面図である。
【図２】図１のシェル形針状ころ軸受の要部を分解して示した拡大断面図である。
【図３】本発明の実施形態に係るシェル形針状ころ軸受の要部を分解して示した断面図である。
【図４】従来のシェル形針状ころ軸受における外輪とシール部材との関係を示す説明図である。
【符号の説明】
１ シェル形針状ころ軸受
２ 外輪
２ａ 軌道面
２ｂ 円筒部
２ｃ 先曲げの鍔部
２ｄ 後曲げの鍔部
３ 針状ころ
５，６ シール部材
Ｗｓ シール部材の軸方向幅
Ｗ７ 内周溝の軸方向幅
Ｒ 軌道面の内径[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shell roller bearing.
[0002]
[Prior art]
Shell-shaped needle roller bearings are provided with a shell-shaped outer ring and a plurality of needle rollers arranged on the inner diameter side. There are two types: full roller type without cage and with cage. There is. At least one end in the axial direction of the outer ring is formed with a flange portion extending toward the inner diameter side. The seal member is provided on the inner side in the axial direction of the flange portion.
[0003]
In the conventional shell-type needle roller bearing, the end portion of the cylindrical portion of the outer ring is thinned by cutting or pressing from the inner diameter side, and the thin portion is bent to the inner diameter side. (See Patent Document 1). This is to prevent the retainer, the roller, the seal member and the like incorporated in the outer ring from coming out.
[0004]
As described above, since the flange portion is formed by a thin portion of the outer ring, an inner circumferential groove recessed in the plate thickness of the outer ring from the raceway surface extends along the circumferential direction of the cylindrical portion. It is formed. Conventionally, this inner peripheral groove is used as a storage portion for the seal member. In this case, the seal member is usually of a type having a cored bar.
[0005]
[Patent Document 1]
JP-A-2002-89550 [0006]
[Problems to be solved by the invention]
In the open-ended shell-type needle roller bearing, flanges are formed at both ends in the axial direction of the cylindrical portion of the outer ring, and seal members are respectively attached to the inner sides in the axial direction of these flanges. One of the collars is called a pre-bent collar and has substantially the same thickness as the cylindrical part. The other collar is called a post-bent collar, and is formed by bending a thin part of the cylindrical part after incorporating a cage, a roller, or a seal member inside the outer ring having the pre-bent collar. Is done. For such a bearing, it is considered to use a seal member that does not include a cored bar and is made only of an elastic material such as rubber or synthetic resin.
[0007]
However, if a seal member without a cored bar is to be assembled on both sides in the axial direction of the outer ring, the seal member has lower rigidity than a seal member with a cored bar. That is, as shown in FIG. 3, the seal member 23 is attached to the inner peripheral surface of the cylindrical portion 22b having the same inner diameter as the raceway surface 22a on the inner side in the axial direction of the pre-bent collar portion 22c of the outer ring 22. The seal member 24 is attached to the inside of the inner circumferential groove 25 on the inner side in the axial direction of the post-bent collar portion 22d. If both the sealing members 23 and 24 have the same dimensions without a cored bar, a radial shift D occurs between the mounting positions of the both sealing members 23 and 24.
[0008]
The seal member 24 provided on the rear-bending collar portion 22d side is insufficient in interference with the outer ring 22, and may be inclined during the rear-bending processing of the collar portion 22d. Further, between the seal members 23 and 24, a difference occurs in the inner diameter dimension of the lip, and the interference with respect to the member serving as the inner ring is also different. For this reason, the expected sealing effect cannot be obtained.
[0009]
For this, seal members with different dimensions may be attached on both sides of the outer ring in the axial direction, but this increases the number of parts used and increases the cost, and seals with corresponding dimensions on the inner side of each flange. Since the members are selected and attached, there is a possibility of mistakes, which is troublesome, and the work efficiency of incorporation is reduced.
[0010]
The present invention addresses the above-described conventional problems, and is a seal member without a cored bar having the same dimensions so that it can be used on both sides in the axial direction of the outer ring. The task is to improve efficiency.
[0011]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides a shell- shaped outer ring having flanges extending to the inner diameter side at both axial ends of the cylindrical portion, and a plurality of rollers disposed on the inner diameter side of the outer ring, A pair of symmetrically provided sealing members provided on the inner side in the axial direction of the both flange parts, and on the inner side in the axial direction of the rear-bent collar part formed by the thin part of the outer ring, of the both flange parts, An inner circumferential groove that is recessed from the raceway surface within the thickness of the outer ring is formed along the circumferential direction of the cylindrical portion, and the axial width of the inner circumferential groove is set to be narrower than the axial width of the seal member. The seal member on the flange side of the post-bending is fitted in contact with the inner peripheral surface of the cylindrical portion adjacent to the inner peripheral groove and having the same inner diameter as the raceway surface, and each of the seal members is A bulge that forms an interference when fitted to the outer ring on the outer peripheral portion on the inner side in the axial direction There has been constituting the shell-shaped roller bearing is formed.
[0012]
According to the said structure, all the sealing members provided in the axial direction both sides of an outer ring | wheel are attached to the cylindrical part internal peripheral surface of the same internal diameter as a track surface. In this case, the seal member may be provided with a mandrel or may not have a mandrel, but in particular, when the seal member does not have a mandrel, both seal members have the same dimensions. In this case, the interference of the seal member with respect to the outer ring is equal on both sides in the axial direction of the outer ring, and the seal member on the flange side of the rear bend does not tilt during the post-bending process of the flange. . Further, the inner diameters of the lip portions of the respective seal members are also equal to each other, and come into contact with the outer peripheral surface of the member serving as the inner ring with the same interference. Thus, the desired sealing effect can be obtained.
[0013]
As a result, seal members that do not have a metal core on both sides in the axial direction of the outer ring and have the same dimensions can be used as bearings without hindrance.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the details of the present invention will be described with reference to the drawings. 1 and 2 show an embodiment of a reference example. An embodiment according to the invention is shown in FIG. First, an embodiment of a reference example will be described. FIG. 1 is a half cross-sectional view along the axial direction of a shell needle roller bearing according to an embodiment, and FIG. 2 is an enlarged cross-sectional view showing an essential part of the shell needle roller bearing of FIG. It is. In these drawings, a shell needle roller bearing with a cage is illustrated.
[0015]
In FIG. 1, reference numeral 1 denotes an entire shell needle roller bearing, 2 is a shell-shaped outer ring, 3 is a needle roller, 4 is a cage, and 5 and 6 are seal members. The shell-shaped outer ring 2 is manufactured from a single metal plate (thin steel plate) by a processing process including bending. A cylindrical portion 2b having a raceway surface 2a on the inner periphery, and an axial direction of the cylindrical portion 2b At both ends, flanges 2c and 2d are formed extending toward the inner diameter side. Of the two flange portions 2c and 2d, one end in the axial direction (left end in the figure) is a pre-bent flange portion 2c, which has substantially the same thickness as the cylindrical portion 2b. At the other end in the axial direction of the cylindrical portion 2b is a post-bent collar portion 2d. The post-bending collar 2d is formed by bending one end of the cylindrical part 2b by cutting from the inner diameter side or by pressing, and then bending the thin part. Therefore, an inner circumferential groove 7 that is recessed from the raceway surface 2a into the thickness of the cylindrical portion 2b is formed along the circumferential direction of the cylindrical portion 2b on the inner side in the axial direction of the post-bend collar portion 2d. Many needle rollers 3 are arranged on the inner diameter side of the outer ring 2 while being held in each pocket of the cage 4.
[0016]
Two seal members 5 and 6 having the same structure and the same size are mounted on the inner sides in the axial direction of the flanges 2c and 2d in opposite directions. The pair of seal members 5 and 6 are symmetrical with each other in the mounted state in the both flange portions 2c and 2d. In the illustrated example, the seal members 5 and 6 are of a type that does not have a core metal, and are entirely made of an elastic material such as rubber or synthetic resin. Each of the seal members 5 and 6 includes thick outer diameter portions 5a and 6a and lip portions 5b and 6b extending obliquely from the outer diameter portions 5a and 6a toward the inner diameter side, and the outer diameter portions 5a and 6a. Between the lip portions 5b and 6b, annular concave grooves 5c and 6c that are recessed in the axial direction are formed.
[0017]
On the inner diameter side of the outer ring 2, the inner peripheral surface of the cylindrical portion 2 b having the same inner diameter R as the raceway surface 2 a is widened and extended toward the rear-bent flange portion 2 d, and the inner peripheral groove 7 is narrow. The axial width W7 of the inner circumferential groove 7 is narrower than the axial width Ws of the seal members 5 and 6 (W7 <Ws). Desirably, the axial width W7 of the inner circumferential groove 7 is less than half the axial width Ws of the seal members 5 and 6.
[0018]
On the inner side in the axial direction of the post-bend collar portion 2d, the seal member 6 presses the outer diameter portion 6a thereof to the inner peripheral surface of the cylindrical portion 2b having the same inner diameter R as the raceway surface 2a at a location adjacent to the inner circumferential groove 7. It is inserted by that. The post-bending collar portion 2d is formed by bending a thin portion at one end of the cylindrical portion 2b with a small radius of curvature, and deformation due to the bending processing extends inward in the axial direction from the inner circumferential groove 7. Not to be.
[0019]
According to the above configuration, the seal members 5 and 6 are all attached to the inner peripheral surface of the cylindrical portion 2b having the same inner diameter R as the raceway surface 2a. In this case, when the axial width W7 of the inner circumferential groove 7 is equal to or less than half the axial width Ws of the sealing members 5 and 6, the sealing member 6 on the side of the post-bend collar 2d is Since the majority is pressed against the inner peripheral surface of the cylindrical portion 2b adjacent to the inner peripheral groove 7, the entire seal member 6 is supported by the inner peripheral surface of the cylindrical portion 2b and is fitted into the inner peripheral groove 7. It does not tilt or incline while partially entering the inner circumferential groove 7.
[0020]
Since both the seal members 5 and 6 are attached to the inner peripheral surface of the cylindrical portion 2b, the interference between the seal members 5 and 6 with respect to the outer ring 2 is equal on both sides in the axial direction of the outer ring 2. The sealing member 6 on the side of the post-bend collar part 2d is fitted on the inner peripheral surface of the cylindrical part 2b and is firmly fitted, similarly to the seal member 5 on the side of the pre-bend collar part 2c. There is no tilting during post-bending. Further, since the inner diameters of the lip portions 5b and 6b of the seal members 5 and 6 are also equal to each other, they come into contact with the outer peripheral surface of the member serving as the inner ring with the same interference. For this reason, the expected sealing effect is obtained on both axial sides of the outer ring 2.
[0021]
FIG. 1 and FIG. 2 show, as a reference example of the shell-type roller bearing, a seal member 6 on the side of the post-bend collar portion 2d whose outer peripheral portion is flat along the axial direction . FIG. 3 shows an embodiment of a shell roller bearing according to the present invention. FIG. 3 is an exploded cross-sectional view of the main part of the shell needle roller bearing according to the present invention.
[0022]
In the seal member 62 of FIG. 3, a bulging portion 6 d that forms an interference to the outer ring 2 is formed on the inner side in the axial direction among the respective portions of the outer peripheral portion. Other configurations of the seal member 62 may be the same as the seal members 5 and 6 illustrated in FIGS. 1 and 2, and corresponding portions are denoted by the same reference numerals.
[0023]
In the above configuration, the seal member 62 is firmly attached to the inner peripheral surface of the cylindrical portion 2b having the same inner diameter R as the raceway surface 2a in a posture along the inner peripheral surface by the press contact of the bulging portion 6d to the outer ring 2 side. It does not fit into the inner circumferential groove 7 or tilt in a form partially entering the inner circumferential groove 7. In this case, the axial width W7 of the inner circumferential groove 7 does not necessarily need to be less than half the axial width Ws of the seal members 5 and 6, and the bulging portion 6d is axially inward from the inner circumferential groove 7. If positioned, the axial width W7 of the inner circumferential groove 7 may be wider than half of the axial width Ws of the seal member 62.
[0024]
In the illustrated embodiment, the shell needle roller bearing 1 with the cage 4 is shown. However, the present invention can also be implemented in a full-roller type needle roller bearing without a cage. it can. Further, the roller is not limited to the needle roller 3 and may be a cylindrical roller. The seal members 5 provided on both sides in the axial direction of the outer ring 2 may be a seal member having no core metal and having a cross-sectional shape different from that shown in the figure, or may be a seal member with a core metal.
[0025]
【The invention's effect】
According to the present invention, a seal member without a metal core is employed, and the same dimensions and the same dimensions can be used without any trouble on both sides in the axial direction of the outer ring, so that the cost can be reduced. Since it is not necessary to select and attach a seal member having a corresponding size in accordance with the inner shape of both flanges, the assembly work of the seal member can be performed efficiently.
[Brief description of the drawings]
FIG. 1 is a half sectional view along an axial direction of a shell needle roller bearing according to an embodiment of a reference example .
FIG. 2 is an enlarged cross-sectional view showing an essential part of the shell needle roller bearing of FIG. 1 in an exploded manner.
3 is a sectional view showing, in disassembled main part of the drawn cup needle roller bearing according to implementation embodiments of the present invention.
FIG. 4 is an explanatory view showing a relationship between an outer ring and a seal member in a conventional shell needle roller bearing.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shell type needle roller bearing 2 Outer ring 2a Raceway surface 2b Cylindrical part 2c Pre-bend collar part 2d Back-bend collar part 3 Needle roller 5,6 Seal member Ws Axial width of seal member W7 Axial direction of inner peripheral groove Width R Inner diameter of raceway surface

Claims (2)

シェル形で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と、この外輪の内径側に配置される複数のころと、前記両鍔部の軸方向内側に設けられる一対で互いに対称形状のシール部材とを備え、
前記両鍔部のうち、外輪の薄肉部分で形成される後曲げの鍔部の軸方向内側には、軌道面より外輪の板厚内に凹入する内周溝が円筒部の周方向に沿って形成されて、この内周溝の軸方向幅が、前記シール部材の軸方向幅より狭い幅に設定され、
前記後曲げの鍔部側のシール部材は、前記内周溝に隣り合って軌道面と同一内径である円筒部内周面に圧接させて嵌着されているとともに、
前記シール部材のそれぞれは、軸方向内側のその外周部に前記外輪に対する嵌合時のしめしろとなる膨出部が形成されていることを特徴とするシェル形ころ軸受。 A shell- shaped outer ring having flanges extending toward the inner diameter side at both ends in the axial direction of the cylindrical part, a plurality of rollers disposed on the inner diameter side of the outer ring, and a pair provided on the inner side in the axial direction of the both flange parts And symmetric seal members with each other,
An inner circumferential groove that is recessed from the raceway surface within the thickness of the outer ring along the circumferential direction of the cylindrical portion is formed on the inner side in the axial direction of the rear-bent collar portion formed by the thin portion of the outer ring. The axial width of the inner circumferential groove is set to be narrower than the axial width of the seal member,
The sealing member on the flange side of the post-bending is fitted in pressure contact with the inner peripheral surface of the cylindrical portion adjacent to the inner peripheral groove and having the same inner diameter as the raceway surface ,
Each of the seal members is a shell -type roller bearing in which a bulging portion is formed on the outer peripheral portion on the inner side in the axial direction as an interference when fitted to the outer ring . 前記シール部材は、芯金を含まず弾性材のみで構成されている請求項１に記載のシェル形ころ軸受。The sealing member is drawn cup roller bearing according to claim 1 that consists of only the elastic material does not include a metal core.
JP2003084715A 2003-03-26 2003-03-26 Shell roller bearing Expired - Fee Related JP4453264B2 (en)

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JP2007064309A (en) * 2005-08-30 2007-03-15 Ntn Corp Shell type roller bearing
JP2007085446A (en) * 2005-09-21 2007-04-05 Ntn Corp Shell type roller bearing
JP5938936B2 (en) * 2012-02-22 2016-06-22 セイコーエプソン株式会社 Liquid ejecting head, liquid ejecting apparatus, and method of manufacturing liquid ejecting head
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CN113847335A (en) * 2021-08-19 2021-12-28 人本股份有限公司 Drawn cup needle roller bearing
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