JP5531651B2 - Needle roller bearing - Google Patents

Needle roller bearing Download PDF

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JP5531651B2
JP5531651B2 JP2010020179A JP2010020179A JP5531651B2 JP 5531651 B2 JP5531651 B2 JP 5531651B2 JP 2010020179 A JP2010020179 A JP 2010020179A JP 2010020179 A JP2010020179 A JP 2010020179A JP 5531651 B2 JP5531651 B2 JP 5531651B2
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outer ring
main body
fixing
lip
seal
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JP2011158031A (en
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健一 橋本
豊 下田
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JTEKT Corp
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JTEKT Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • 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 With Elastic Sealing Lips (AREA)
  • Sealing Of Bearings (AREA)
  • Rolling Contact Bearings (AREA)

Description

本発明は、針状ころ軸受に関する。   The present invention relates to a needle roller bearing.

針状ころ軸受として、外輪と、外輪の内周面に沿うように配置された複数の針状ころと、外輪の内周端面に針状ころと軸方向に並んで配置され環状の弾性体製シールのみからなるシール部材とを備えており、弾性体製シールは、本体部と、シール用リップを有する内径部と、外輪に固定されている外径部とを有しているものが知られている。
特開２００５―６９３３７号公報 As the needle roller bearing, an outer ring, a plurality of needle rollers arranged along the inner peripheral surface of the outer ring, and an annular elastic body arranged in the axial direction with the needle rollers on the inner peripheral end surface of the outer ring. It is known that an elastic seal has a main body portion, an inner diameter portion having a sealing lip, and an outer diameter portion fixed to the outer ring. ing.
JP 2005-69337 A

上記の針状ころ軸受において、シール部材を弾性体製シールのみからなる芯金無しのものとすることのコスト低減効果は非常に大きいが、固定部分の剛性が低下することから、この部分での耐圧性や耐水性が芯金有りのものに比べると不利になっている。特許文献１のものでは、外径部と内径部との間に環状の凹部を設けることで、弾性体製シールを外輪に効果的に保持させるようになっているが、より一層の耐圧性や耐水性の向上が望まれている。   In the above needle roller bearing, the cost reduction effect of using a seal member without a cored bar made only of an elastic seal is very large, but the rigidity of the fixed part is reduced. The pressure resistance and water resistance are disadvantageous compared to those with a cored bar. In Patent Document 1, an annular recess is provided between the outer diameter portion and the inner diameter portion so that the elastic seal is effectively held by the outer ring. Improvement of water resistance is desired.

この発明は、シール部材の固定部分の耐圧性や耐水性を向上させることができる針状ころ軸受を提供することにある。   An object of the present invention is to provide a needle roller bearing capable of improving the pressure resistance and water resistance of a fixed portion of a seal member.

請求項１による針状ころ軸受けは、両端部に径方向内側へ屈曲して形成された鍔部を有する外輪と、外輪の内周面に沿うように配置された複数の針状ころと、外輪の内周端面に針状ころと軸方向に並んで配置され環状の弾性体製シールのみからなるシール部材とを備えており、弾性体製シールは、本体部と、シール用リップを有する内径部と、外輪に固定されている外径部とを有している針状ころ軸受において、 弾性体製シールの外径部は、弾性曲げ変形して外輪に密着している固定用リップを有しており、前記固定用リップが、外輪に装着される前の状態で径方向外側に向かって開口する略V字状となるように形成された２つの固定用リップであり、２つの固定用リップの基部と本体部との間に、本体部よりも軸方向の幅が狭い連結部とが設けられており、本体部の外周面、連結部の側面および固定用リップの内周面によって、環状の凹部が形成されており、弾性体シールの内径部は、径方向内側へ向かって開口する略V字状となるように形成された２つのシール用リップを有しており、２つのシール用リップの基部と本体部との間に、本体部よりも軸方向の幅が狭い連結部が設けられており、本体部の内周面、連結部の側面およびシール用リップの外周面によって、環状の凹部が形成されており、さらに、固定用リップの軸方向の幅が、シール用リップの軸方向の幅よりも小さいものとされていることを特徴とするものである。 The needle roller bearing according to claim 1 includes an outer ring having flanges formed by bending radially inward at both ends, a plurality of needle rollers arranged along the inner peripheral surface of the outer ring, and the outer ring. The inner peripheral end surface of the roller body is provided with a needle roller and a seal member made of only an annular elastic seal arranged side by side in the axial direction. The elastic seal has a main body portion and an inner diameter portion having a sealing lip. And an outer diameter portion fixed to the outer ring, the outer diameter portion of the elastic seal has a fixing lip that is elastically bent and closely attached to the outer ring. The fixing lips are two fixing lips formed so as to be substantially V-shaped and open outward in the radial direction before being attached to the outer ring. Between the base part and the main body part, there is a connecting part whose axial width is narrower than the main body part. An annular recess is formed by the outer peripheral surface of the main body portion, the side surface of the coupling portion, and the inner peripheral surface of the fixing lip, and the inner diameter portion of the elastic seal opens toward the radially inner side. There are two sealing lips formed so as to be substantially V-shaped, and there is a connecting portion having a narrower axial width than the main body between the base of the two sealing lips and the main body. An annular recess is formed by the inner peripheral surface of the main body portion, the side surface of the coupling portion, and the outer peripheral surface of the sealing lip, and the axial width of the fixing lip is set to be smaller than that of the sealing lip. It is characterized by being smaller than the width in the axial direction .

外輪は、両端部あるいは一端部に鍔部が形成されるシェル形であってもよい。外輪に鍔部が設けられていると、装着後の弾性体製シールは、本体部の側面が鍔部の内周面に軸方向で係止されるので、外輪に効果的に保持される。   The outer ring may have a shell shape in which a flange is formed at both ends or one end. When the collar is provided on the outer ring, the elastic seal after mounting is effectively held by the outer ring since the side surface of the main body is axially locked to the inner peripheral surface of the collar.

本体部の断面形状は、例えば、軸方向寸法が径方向寸法よりも大きい横長形状とされる。   The cross-sectional shape of the main body is, for example, a horizontally long shape whose axial dimension is larger than the radial dimension.

内径部は、径方向内側に向かって開口する略V字状となるように形成された２つのシール用リップを有しており、２つのシール用リップの基部と本体部との間には、本体部よりも軸方向の幅が狭い連結部が設けられている。本体部の内周面、連結部の側面および各シール用リップの外周面によって、シール用リップの弾性曲げ変形を容易とする環状の凹部が形成されている。   The inner diameter part has two sealing lips formed so as to be substantially V-shaped opening toward the inner side in the radial direction, and between the base part of the two sealing lips and the main body part, A connecting portion having a narrower axial width than the main body portion is provided. An annular recess that facilitates elastic bending deformation of the sealing lip is formed by the inner peripheral surface of the main body portion, the side surface of the connecting portion, and the outer peripheral surface of each sealing lip.

弾性体製シールは、固定用リップが外輪の内周面と密着することができる程度の所定の剛性を有する弾性材や樹脂材(ＰＯＭ，ＰＰ，ＰＵ等)で形成される。   The elastic seal is formed of an elastic material or a resin material (POM, PP, PU, etc.) having a predetermined rigidity such that the fixing lip can be in close contact with the inner peripheral surface of the outer ring.

固定用リップは、１つでもよいが、この発明の針状ころ軸受において、弾性体製シールの外径部が、外輪に装着される前の状態で径方向外側に向かって開口する略V字状となるように形成された２つの固定用リップと、２つの固定用リップの基部と本体部との間に、本体部よりも軸方向の幅が狭い連結部とを有していることが好ましい。このようにすると、より強く固定リップを外輪に密着させることができる。そして、シール用リップも断面略V字状となるように２つ形成され、弾性体製シールは、全体として左右（軸方向に）対象形状とされることが好ましい。このようにすると、装着方向を確認することなく弾性体製シールを外輪に装着することができるので、生産効率を向上させることができる。   The number of the fixing lip may be one, but in the needle roller bearing according to the present invention, the outer diameter portion of the elastic seal is substantially V-shaped opening outward in the radial direction before being attached to the outer ring. Two fixing lips formed in a shape, and a connecting portion having a narrower axial width than the main body portion between the base portion of the two fixing lips and the main body portion. preferable. If it does in this way, a fixed lip can be stuck more closely to an outer ring. Two sealing lips are preferably formed so as to have a substantially V-shaped cross section, and the elastic seal is preferably the target shape on the left and right (in the axial direction) as a whole. In this way, since the elastic seal can be attached to the outer ring without confirming the attaching direction, the production efficiency can be improved.

固定用リップは、外輪に装着される前の状態で、例えば、外周面がテーパ面（断面が軸方向に対して傾斜した直線）とされ、テーパ面の小径側の径が外輪の内径よりもわずかに大きいものとされる。そして、外輪に装着されることにより、テーパ面の小径側部分が弾性圧縮変形するとともに、テーパ面の大径側部分が弾性曲げ変形し、外輪に装着された後の状態では、固定用リップは、その外周面が外輪内周面に沿わされて密着する。固定用リップと本体部との間には、軸方向に開口した凹部が存在し、この凹部は、弾性体製シールが外輪に装着されることで、その開口が狭められ、固定用リップの弾性曲げ変形を容易とする。   The fixing lip is in a state before being attached to the outer ring, for example, the outer peripheral surface is a tapered surface (a straight line whose cross section is inclined with respect to the axial direction), and the diameter on the small diameter side of the tapered surface is larger than the inner diameter of the outer ring. Slightly larger. And by attaching to the outer ring, the small diameter side portion of the tapered surface is elastically compressed and deformed, and the large diameter side portion of the tapered surface is elastically bent and deformed. The outer peripheral surface is in close contact with the inner peripheral surface of the outer ring. There is a recess opening in the axial direction between the fixing lip and the main body, and this opening is narrowed by attaching an elastic seal to the outer ring, and the elasticity of the fixing lip is reduced. Easy bending deformation.

装着後の固定用リップの弾性圧縮変形量および弾性曲げ変形量を所定値以上とすることで、弾性体製シールは、外輪に強固に保持され、耐圧性および耐水性が確保される。軸受外部から圧がかかった場合、固定用リップは、この圧によって外輪の内周面に押し付けられることになり、耐圧性および耐水性の点で有利なものとなる。   By setting the amount of elastic compression deformation and elastic bending deformation of the fixing lip after mounting to a predetermined value or more, the elastic seal is firmly held by the outer ring, and pressure resistance and water resistance are ensured. When pressure is applied from the outside of the bearing, the fixing lip is pressed against the inner peripheral surface of the outer ring by this pressure, which is advantageous in terms of pressure resistance and water resistance.

断面略V字状の固定用リップと断面略V字状のシール用リップとは、略対称に形成されるが、固定用リップの外周面のテーパ角度は、シール用リップの外周面のテーパ角度よりも小さいものとされ、シール用リップも弾性曲げ変形するが、その変形量は、固定用リップよりも小さいものとされる。また、シール用リップの内周面の大径側の径は、これが摺接する部材（例えば、回転軸）の外径よりも大きくなされており、シール用リップのテーパ面の大径側部分は弾性圧縮変形しないものとされる。   The fixing lip having a substantially V-shaped cross section and the sealing lip having a substantially V-shaped cross section are formed substantially symmetrically, but the taper angle of the outer peripheral surface of the fixing lip is the taper angle of the outer peripheral surface of the sealing lip. The sealing lip is also elastically bent and deformed, but the amount of deformation is smaller than that of the fixing lip. Further, the diameter on the large-diameter side of the inner peripheral surface of the sealing lip is made larger than the outer diameter of the member (for example, the rotating shaft) with which it slides, and the large-diameter portion of the tapered surface of the sealing lip is elastic. It shall not be compressed and deformed.

鍔部が外輪の端部を屈曲させて形成される場合、固定用リップが外輪の内周面隅部と干渉しないように、固定用リップの軸方向の幅は、シール用リップの軸方向の幅よりも小さいものとされることが好ましい。   When the flange is formed by bending the end of the outer ring, the axial width of the fixing lip is set in the axial direction of the sealing lip so that the fixing lip does not interfere with the inner peripheral corner of the outer ring. The width is preferably smaller than the width.

軸方向外側の固定用リップの先端が、例えば、本体部の軸方向外側の面よりも外側に延びて設けられた場合、鍔部が形成された外輪に弾性体製シールを装着すると、軸方向外側の固定用リップの先端部と外輪の内周面隅部とが干渉して、固定用リップを外輪に十分に密着させることが困難となるので、耐圧性および耐水性を効果的に向上させることができなくなる。そこで、固定用リップが外輪の内周面隅部と干渉しないように、固定用リップの軸方向の幅が、シール用リップの軸方向の幅よりも小さいものとされると、固定用リップが外輪の内周面と十分に密着することができ、耐圧性を効果的に向上させることができる。   For example, when the tip of the fixing lip on the outer side in the axial direction is provided so as to extend outward from the surface on the outer side in the axial direction of the main body, if the elastic seal is attached to the outer ring formed with the flange, the axial direction The tip of the outer fixing lip and the inner peripheral surface corner of the outer ring interfere with each other, making it difficult to bring the fixing lip into close contact with the outer ring, thereby effectively improving pressure resistance and water resistance. I can't do that. Therefore, if the axial width of the fixing lip is smaller than the axial width of the sealing lip so that the fixing lip does not interfere with the inner peripheral surface corner of the outer ring, the fixing lip is It is possible to sufficiently adhere to the inner peripheral surface of the outer ring, and the pressure resistance can be effectively improved.

この発明の針状ころ軸受によると、弾性体製シールの外径部は、弾性曲げ変形して外輪に密着している固定用リップを有しているので、軸受外部から圧がかかった場合、固定用リップは、この圧によって外輪の内周面に押し付けられ、弾性体製シールは外輪に固定されることとなり、耐圧性および耐水性を向上させることができる。また、シール部材に芯金を使用しないので、芯金を有するシールに比べてシールの生産コストを低減させることができる。   According to the needle roller bearing of the present invention, the outer diameter portion of the elastic seal has a fixing lip that is elastically bent and closely attached to the outer ring, so when pressure is applied from the outside of the bearing, The fixing lip is pressed against the inner peripheral surface of the outer ring by this pressure, and the elastic seal is fixed to the outer ring, so that pressure resistance and water resistance can be improved. Further, since no cored bar is used for the seal member, the production cost of the seal can be reduced as compared with a seal having a cored bar.

以下、この発明の実施形態について図面を参照して説明する。   Embodiments of the present invention will be described below with reference to the drawings.

図１は、針状ころ軸受の全体構成を示す縦断面図である。図２は、図１の部分拡大図である。図３は、未装着状態の弾性体製シールを示している。   FIG. 1 is a longitudinal sectional view showing the overall configuration of a needle roller bearing. FIG. 2 is a partially enlarged view of FIG. FIG. 3 shows the elastic seal in an unmounted state.

針状ころ軸受(1)は、シェルタイプと呼ばれるもので、内輪（回転側軌道部材）(2)と、外輪（固定側軌道部材）(3)と、外輪(3)の内周面に沿うように配置された針状ころ(4)と、針状ころ(4)を保持する保持器(5)と、保持器(5)の軸方向に並んで配置された弾性体製シールのみからなるシール部材(6)とを備えている。   The needle roller bearing (1) is called a shell type, and is along the inner ring (rotating side raceway member) (2), the outer ring (fixed side raceway member) (3), and the inner circumference of the outer ring (3). Needle roller (4) arranged in such a manner, cage (5) holding needle roller (4), and elastic body seal arranged side by side in the axial direction of cage (5) And a seal member (6).

外輪(3)は、針状ころ(4)の軌道面およびシール部材(6)が装着される面（シール装着面）(7)を有する円筒部(8)と、外輪(3)の両端部に径方向内側へ屈曲して形成された鍔部(9)とから構成されている。
鍔部(9)は、円筒部(8)から針状ころ(4) やシール部材(6)の抜け出しを防止している。 The outer ring (3) includes a cylindrical portion (8) having a raceway surface of the needle roller (4) and a surface (seal mounting surface) (7) on which the seal member (6) is mounted, and both ends of the outer ring (3). And a flange (9) formed by bending inward in the radial direction.
The flange part (9) prevents the needle rollers (4) and the seal member (6) from coming out of the cylindrical part (8).

弾性体製シールは、ゴムなどの剛性よりも大きい所要の剛性を有し、弾性変形する樹脂材で環状に形成されている。弾性体シールは、本体部(10)と、内径部(11)と、外径部(12)とから構成されている。   The seal made of an elastic body has a required rigidity larger than that of rubber or the like, and is formed in an annular shape with a resin material that is elastically deformed. The elastic seal is composed of a main body portion (10), an inner diameter portion (11), and an outer diameter portion (12).

本体部(10)の断面は、軸方向寸法が径方向寸法よりも大きい横長形状に形成されている。   The cross section of the main body (10) is formed in a horizontally long shape whose axial dimension is larger than the radial dimension.

内径部(11)は、径方向内側に向かって開口する略V字状となるように形成された２つのシール用リップ(13)(14)を有しており、２つのシール用リップ(13)(14)の基部と本体部(10)との間には、本体部(10)よりも軸方向の幅が狭い連結部(15)が設けられている。２つのシール用リップ(13)(14)は、軸方向で対称に形成されている。本体部(10)の内周面、連結部の側面および各シール用リップ(13)(14)の外周面によって、シール用リップ(13)(14)の弾性曲げ変形を容易とする環状の凹部(16)が形成されている。   The inner diameter portion (11) has two sealing lips (13) and (14) formed so as to be substantially V-shaped and open toward the inside in the radial direction. ) (14) and the main body (10) are provided with a connecting portion (15) having a narrower axial width than the main body (10). The two sealing lips (13) and (14) are formed symmetrically in the axial direction. An annular recess that facilitates elastic bending deformation of the sealing lip (13) (14) by the inner peripheral surface of the main body (10), the side surface of the connecting portion, and the outer peripheral surface of each sealing lip (13) (14) (16) is formed.

外径部(12)は、径方向外側に向かって開口する略V字状となるように形成された２つの固定用リップ(17)(18)を有しており、２つの固定用リップ(17)(18)の基部と本体部(10)との間には、本体部(10)よりも軸方向の幅が狭い連結部(19)が設けられている。２つの固定用リップ(17)(18)は、軸方向で対称に形成されている。本体部(10)の外周面、連結部の側面および各固定用リップ(17)(18)の内周面によって、固定用リップ(17)(18)の弾性曲げ変形を容易とする環状の凹部(20)が形成されている。また、固定用リップ(17)(18)は、鍔部(9)との干渉を避けるため、固定用リップ(17)(18)の軸方向の幅は、シール用リップ(13)(14)の軸方向の幅よりも小さいものとされている。   The outer diameter portion (12) has two fixing lips (17) and (18) formed so as to be substantially V-shaped and opened outward in the radial direction. 17) A connecting portion (19) having a narrower axial width than the main body portion (10) is provided between the base portion of (18) and the main body portion (10). The two fixing lips (17) and (18) are formed symmetrically in the axial direction. An annular recess that facilitates elastic bending deformation of the fixing lips (17) and (18) by the outer peripheral surface of the main body (10), the side surfaces of the connecting portions, and the inner peripheral surfaces of the fixing lips (17) and (18). (20) is formed. Also, the fixing lips (17) and (18) have an axial width of the sealing lips (13) and (14) to avoid interference with the flange (9). It is supposed to be smaller than the axial width.

シール部材(6)をシール装着面(7)に装着する際は、シール部材(6)を縮径させるよう変形させて一方から鍔部(9)をくぐらせ、さらにシール部材(6)のくぐっていない部分を押し込むことでシール部材(6)がシール装着面(7)に装着される。   When attaching the seal member (6) to the seal attachment surface (7), the seal member (6) is deformed so as to reduce its diameter, and the flange (9) is passed from one side, and the seal member (6) is further passed through. The seal member (6) is attached to the seal attachment surface (7) by pushing in the unoccupied portion.

固定用リップ(17)(18)は、図２の二点鎖線に示すように、シール装着面(7)に装着される前の状態で、外周面がテーパ面（断面が軸方向に対して傾斜した直線）とされ、テーパ面の小径側(12a)の径がシール装着面(7)の径よりもわずかに大きいものとされる。そして、実線で示すように、シール装着面(7)に装着されることにより、テーパ面の小径側(12a)部分が弾性圧縮変形するとともに、テーパ面の大径側(12b)部分が弾性曲げ変形し、外輪(3)に装着された後の状態では、固定用リップ(17)(18)は、その外周面がシール装着面(7)に沿わされて密着する。   As shown by the two-dot chain line in FIG. 2, the fixing lips (17) and (18) have a tapered surface (the cross section is axial with respect to the axial direction) before being mounted on the seal mounting surface (7). The diameter of the tapered surface (12a) is slightly larger than the diameter of the seal mounting surface (7). Then, as shown by the solid line, by attaching to the seal mounting surface (7), the small diameter side (12a) portion of the tapered surface is elastically deformed and the large diameter side (12b) portion of the tapered surface is elastically bent. In a state after being deformed and mounted on the outer ring (3), the outer peripheral surface of the fixing lip (17) (18) is in close contact with the seal mounting surface (7).

装着されるとテーパ面の小径側(12a)の径は、シール装着面(7)の径よりもわずかに大きく形成されていることから、シール部材(6)の弾性復元力により、固定用リップ(17)(18)がシール装着面(7)に密着し、シール部材(6)はシール装着面(7)に確実に保持される。   When mounted, the diameter of the small diameter side (12a) of the tapered surface is slightly larger than the diameter of the seal mounting surface (7). (17) (18) is in close contact with the seal mounting surface (7), and the seal member (6) is securely held on the seal mounting surface (7).

この発明の針状ころ軸受(1)では、シール部材(6)の外径部(12)に２つの固定用リップ(17)(18)が形成されているので、シール部材(6)がシール装着面(7)に装着されることによって、圧力がシール部材(6)にかかり、凹部(20)の存在により固定用リップ(17)(18)が外輪(3)に押し付けられ、シール部材(6)がシール装着面(7)に密着して強固に固定されるので、シール部材(6)の耐圧性や耐水性を向上させることができる。矢印Aのような軸方向外側からの圧がシール部材(6)にかかった場合、固定用リップ(17)(18)は、この圧によって外輪(3)のシール装着面(7)に押し付けられることになり、耐圧性および耐水性の点で有利なものとなる。また、シール部材(6)が、外輪(3)に固定されるので、内輪(2)の回転によるシール部材(6)の連れ回りを防止することができる。さらに、鍔部(9)との干渉を避けるため、固定用リップ(17)(18)の軸方向の幅が、シール用リップ(13)(14)の軸方向の幅よりも小さいものとされているから、軸方向外側の固定用リップ(17)の先端部(17a)と外輪(3)の内周面隅部(3a)とが干渉することなくシール部材(6)をシール装着面(7)に効果的に密着させることができる。   In the needle roller bearing (1) of the present invention, since the two fixing lips (17) and (18) are formed on the outer diameter portion (12) of the seal member (6), the seal member (6) is sealed. By mounting on the mounting surface (7), pressure is applied to the seal member (6), and the fixing lip (17) (18) is pressed against the outer ring (3) due to the presence of the recess (20), and the seal member ( Since 6) adheres firmly to the seal mounting surface (7) and is firmly fixed, the pressure resistance and water resistance of the seal member (6) can be improved. When pressure from the outside in the axial direction as indicated by arrow A is applied to the seal member (6), the fixing lips (17) and (18) are pressed against the seal mounting surface (7) of the outer ring (3) by this pressure. This is advantageous in terms of pressure resistance and water resistance. Further, since the seal member (6) is fixed to the outer ring (3), it is possible to prevent the seal member (6) from being rotated by the rotation of the inner ring (2). Further, in order to avoid interference with the flange (9), the axial width of the fixing lips (17) and (18) is made smaller than the axial width of the sealing lips (13) and (14). Therefore, the seal member (6) is attached to the seal mounting surface without interfering between the tip end portion (17a) of the fixing lip (17) on the outer side in the axial direction and the inner peripheral surface corner portion (3a) of the outer ring (3) ( It can be effectively adhered to 7).

図１は、この発明による針状ころ軸受の一実施形態を示す縦断面図である。FIG. 1 is a longitudinal sectional view showing an embodiment of a needle roller bearing according to the present invention. 図２は、装着されたシール部材の状態を示す図１の拡大図である。FIG. 2 is an enlarged view of FIG. 1 showing a state of the attached seal member. 図３は、この発明の特徴部分である未装着状態のシール部材の断面図である。FIG. 3 is a cross-sectional view of the seal member in an unmounted state, which is a characteristic part of the present invention.

(1) 針状ころ軸受
(3) 外輪
(4) 針状ころ
(6) シール部材
(10) 本体部
(11) 内径部
(12) 外径部
(13)(14) シール用リップ
(17)(18) 固定用リップ (1) Needle roller bearing
(3) Outer ring
(4) Needle roller
(6) Seal member
(10) Main unit
(11) Inner diameter
(12) Outer diameter part
(13) (14) Lip for sealing
(17) (18) Fixing lip

Claims (1)

両端部に径方向内側へ屈曲して形成された鍔部を有する外輪と、外輪の内周面に沿うように配置された複数の針状ころと、外輪の内周端面に針状ころと軸方向に並んで配置され環状の弾性体製シールのみからなるシール部材とを備えており、弾性体製シールは、本体部と、シール用リップを有する内径部と、外輪に固定されている外径部とを有している針状ころ軸受において、
弾性体製シールの外径部は、弾性曲げ変形して外輪に密着している固定用リップを有しており、前記固定用リップが、外輪に装着される前の状態で径方向外側に向かって開口する略V字状となるように形成された２つの固定用リップであり、２つの固定用リップの基部と本体部との間に、
本体部よりも軸方向の幅が狭い連結部とが設けられており、本体部の外周面、連結部の側面および固定用リップの内周面によって、環状の凹部が形成されており、
弾性体シールの内径部は、径方向内側へ向かって開口する略V字状となるように形成された２つのシール用リップを有しており、
２つのシール用リップの基部と本体部との間に、本体部よりも軸方向の幅が狭い連結部が設けられており、本体部の内周面、連結部の側面およびシール用リップの外周面によって、環状の凹部が形成されており、さらに、固定用リップの軸方向の幅が、シール用リップの軸方向の幅よりも小さいものとされていることを特徴とする針状ころ軸受。 An outer ring having a flange formed by bending radially inward at both ends, a plurality of needle rollers arranged along the inner peripheral surface of the outer ring, and a needle roller and a shaft on the inner peripheral end surface of the outer ring A seal member made only of an annular elastic seal arranged in a direction, and the elastic seal is composed of a main body portion, an inner diameter portion having a sealing lip, and an outer diameter fixed to the outer ring. In a needle roller bearing having a portion,
The outer diameter portion of the elastic seal has a fixing lip that is elastically bent and is in close contact with the outer ring, and the fixing lip faces outward in the radial direction before being attached to the outer ring. Two fixing lips formed so as to be substantially V-shaped and opened between the base and the main body of the two fixing lips,
A connecting portion that is narrower in the axial direction than the main body portion is provided, and an annular recess is formed by the outer peripheral surface of the main body portion, the side surface of the connecting portion, and the inner peripheral surface of the fixing lip,
The inner diameter part of the elastic body seal has two sealing lips formed so as to be substantially V-shaped opening radially inward,
Between the base part of the two sealing lips and the main body part, a connecting part having a narrower axial width than the main body part is provided. The inner peripheral surface of the main body part, the side surface of the connecting part, and the outer periphery of the sealing lip A needle roller bearing characterized in that an annular recess is formed by the surface, and the axial width of the fixing lip is smaller than the axial width of the sealing lip .
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