WO2023037918A1 - Needle roller bearing - Google Patents

Needle roller bearing Download PDF

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Publication number
WO2023037918A1
WO2023037918A1 PCT/JP2022/032424 JP2022032424W WO2023037918A1 WO 2023037918 A1 WO2023037918 A1 WO 2023037918A1 JP 2022032424 W JP2022032424 W JP 2022032424W WO 2023037918 A1 WO2023037918 A1 WO 2023037918A1
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Prior art keywords
needle
needle roller
holding jig
roller bearing
rim
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PCT/JP2022/032424
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French (fr)
Japanese (ja)
Inventor
航大 渡部
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Ntn株式会社
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Application filed by Ntn株式会社 filed Critical Ntn株式会社
Priority to CN202280060641.9A priority Critical patent/CN117916478A/en
Publication of WO2023037918A1 publication Critical patent/WO2023037918A1/en

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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
    • 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
    • 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
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/46—Cages for rollers or needles

Definitions

  • the present invention does not disperse the needle rollers during assembly, and it is possible to obtain a roller filling rate equivalent to that of a needle roller bearing of a full complement type without a cage.
  • the present invention relates to a needle roller bearing provided with a needle roller holding jig.
  • Patent Document 1 in a needle roller bearing with a retainer, by providing the column portion of the retainer on the outer diameter side of the pitch circle diameter (PCD) of the needle roller, the column portion of the retainer is It is disclosed to reduce the column width of the roller and increase the roller filling factor.
  • PCD pitch circle diameter
  • a restricting member such as a thrust washer is provided between the outer surface of the retainer and another member in order to prevent deterioration of column strength and deformation of the retainer. are provided.
  • the wear and heat generation of the cage due to interference between the needle roller bearings is avoided. Furthermore, if a regulating member such as a flange or a thrust washer is provided on the outer surface of the retainer, the thickness of the regulating member extends in the axial direction, resulting in an increase in space in the axial direction.
  • Patent Document 3 discloses a full complement roller bearing in which a self-lubricating separator is arranged, the separator cannot hold the rollers, so there is a problem in assembly.
  • An object of the present invention is to provide a needle roller bearing equipped with a needle roller holding jig capable of
  • the present invention includes a plurality of needle rollers and a holding jig for preventing the needle rollers from falling off. and a plurality of pillars connecting the radially outer diameter portions of the pair of rims at predetermined intervals in the circumferential direction.
  • the inner diameter surface of the column portion is located on the outer diameter side of the pitch circle diameter of the needle rollers, and An inter-roller clearance rs between the needle rollers is narrower than a pocket clearance cs formed between the pillar and the needle at the contact position between the pillar and the needle.
  • the inner diameter surface of the column portion is located on the outer diameter side of the pitch circle diameter of the needle rollers, and the inter-roller gap rs between the needle rollers on the pitch circle diameter of the needle rollers is set to , is narrower than the pocket clearance cs formed between the pillar and the needle roller at the contact position of the pillar and the needle roller, even if the needle roller is skewed during operation, Adjacent needle rollers come into contact with each other before they come into contact with the pillars.
  • the needle roller bearing of the present invention it is possible to increase the roller filling rate, so it is possible to increase the load capacity.
  • the surface roughness Ra (arithmetic mean roughness) of the finished surface in general good machining is 6.3 ⁇ m, but in the present invention, the wear and heat generation of the outer surface of the rim portion can be avoided. For this reason, the surface roughness Ra of the outer surface of the rim portion is set to 1.6 ⁇ m or less.
  • the needle roller bearing of the present invention when used in double rows, the rim portion outer surfaces interfere with each other, and an induced thrust load corresponding to the number of bearing rows acts on the rim portion outer surfaces. Therefore, the possibility of wear and heat generation on the outer surface of the rim increases further.
  • the needle roller bearing of the present invention when using the needle roller bearing of the present invention in a double row, it is necessary to set the surface roughness Ra of the outer surface of the rim portion to 0.4 ⁇ m or less in order to further improve reliability.
  • surface roughness Ra refers to arithmetic mean roughness defined in JIS B 0601:1990.
  • the rim portion of the holding jig is inclined such that the inner diameter end spreads outward in the axial direction, the induced thrust generated by the roller skew is reduced by the rim portion of the holding jig. , and the load point position moves radially inward. If the load point position moves inward in the radial direction, the moment load applied to the pillar increases, which increases the possibility that the strength of the holding jig will decrease.
  • the angle of the rim portion with respect to the outer diameter surface of the holding member is set to 90° or less so that the rim portion of the holding jig does not expand axially outward, thereby reducing the moment load applied to the column portion.
  • the rim portion of the holding jig tilts too far toward the needle roller side, that is, inward in the axial direction, the needle roller and the rim portion interfere with each other, so it is necessary to set the lower limit of the angle of inclination toward the inner side in the axial direction.
  • the lower limit of the inclination angle of the rim toward the inside in the axial direction can be defined by the following equation (1).
  • W1 is the length from the pocket to the outer surface of the rim
  • T is the plate thickness of the rim
  • L is the length from the inner diameter end of the rim to the inner diameter of the column
  • ⁇ is the holding jig. is the angle of the rim with respect to the outer diameter surface of the
  • the rim portion of the holding jig must satisfy the following formula 2. ⁇ 90° and W 1 ⁇ Tsin ⁇ +Lcos ⁇ Equation 2
  • the induced thrust generated by the roller skew is received by the rim portion, and the width surface of the rim portion comes into contact with other members. more likely to decline. Therefore, in order to improve the strength of the holding jig, the relationship between the length L of the rim portion and the diameter Da of the needle roller should satisfy the following equation. 0.78 ⁇ (L sin ⁇ +W 2 )/Da ⁇ 1 W2 is the length from the outer diameter surface of the holding jig to the outer diameter end of the rim portion.
  • the inner diameter surface of the column portion is located on the outer diameter side of the pitch circle diameter of the needle rollers, and the needle rollers are positioned above the pitch circle diameter of the needle rollers. Since the inter-roller gap rs is narrower than the pocket gap cs formed between the column and the needle roller at the point of contact between the column and the needle roller, the needle rollers are skewed during operation. However, the adjacent needle rollers come into contact with each other before the needle rollers and the pillars come into contact with each other.
  • the load on the column is small, and the width of the column can be narrowed so that the needle rollers can be arranged on the pitch circle diameter up to the full roller state. Thereafter, it is possible to increase it to preferably 93 to 100% or less.
  • the wear and heat generation of the outer surface of the rim portion are avoided.
  • FIG. 1 is a perspective view of a needle roller bearing according to an embodiment of the invention
  • FIG. 2 is a side view of the needle roller bearing of FIG. 1
  • FIG. 2 is a cross-sectional view of the needle roller bearing of FIG. 1 taken along a plane perpendicular to the axis
  • FIG. 4 is an enlarged view showing the relationship between the column portion and the needle rollers of the needle roller bearing according to the embodiment of the present invention
  • FIG. 3 is a partially enlarged view showing the relationship between the needle rollers and the rim portion of the needle roller bearing according to the embodiment of the invention
  • a needle roller bearing 1 includes a plurality of needle rollers 2 and a holding jig 3 for preventing the needle rollers 2 from falling off.
  • a resin sleeve 4 is fitted on the inner diameter side of the needle rollers 2 to prevent the needle rollers 2 from coming apart during assembly.
  • the holding jig 3 includes a pair of rims 3a arranged on both sides in the axial direction, and a plurality of pillars 3b connecting the radially outer sides of the pair of rims 3a at predetermined intervals in the circumferential direction.
  • a plurality of pockets for holding the needle rollers 2 are formed by the pair of rim portions 3a and the plurality of column portions 3b.
  • the inner diameter surface of the column portion 3b is located on the outer diameter side of the pitch circle diameter (PCD) of the needle rollers 2 arranged in the circumferential direction.
  • PCD pitch circle diameter
  • the inter-roller gap rs which is formed between the needle rollers 2 on the pitch circle diameter, is set to the position where the column portion 3b and the needle roller 2 contact each other. It is set to be narrower than the pocket clearance cs formed between the rollers, that is, rs ⁇ cs.
  • the inter-roller clearance rs is a clearance formed between the adjacent needle rollers 2 when the needle rollers 2 are evenly arranged on the pitch circle diameter. It can be obtained by dividing the value obtained by subtracting the total length of the diameter D of the shaped rollers 2 by the total number of the needle rollers 2 .
  • the pocket clearance cs is the distance from the point of contact of the column portion 3b to the point of contact of the needle roller 2 at the contact position between the needle roller 2 and the column portion 3b. 1 of the length obtained by subtracting the diameter of the needle roller 2 at the contact position between the needle roller 2 and the column portion 3b from the inter-column distance at the contact position between the needle roller 2 and the column portion 3b when the needle roller 2 and the column portion 3b are arranged in the state of /2.
  • the inter-roller clearance rs is set narrower than the pocket clearance cs, even if the needle rollers 2 are skewed during operation, the adjacent needles will be separated before the needle rollers 2 and the column portion 3b come into contact with each other. Since the shaped rollers 2 are in contact with each other, the load on the column portion 3b can be reduced. Therefore, it is possible to reduce the column width of the column portion 3b and arrange the needle rollers 2 up to a full roller state on the pitch circle diameter. It is also possible to increase it to 100% or less.
  • the roller packing ratio is the ratio of the sum of the diameters Da of the needle rollers 2 arranged on the pitch circle diameter to the circumferential length of the pitch circle diameter of the needle rollers.
  • the roller filling rate is 100%.
  • the holding jig 3 serves as an outer diameter guide, and the strength and rigidity of the holding jig 3 are maintained high. be able to.
  • the column portion 3b has a tapered shape in which both side surfaces are inclined from the inner diameter side toward the outer diameter side. By widening the width of the side, the cross-sectional area of the column portion 3b is increased and the strength of the column portion 3b is ensured.
  • the holding jig 3 is made of resin or steel plate.
  • the column portion 3b of the holding jig 3 may be formed into a tapered shape by milling the side surface, but in consideration of the cost, it may be formed into a tapered shape by pressing after press processing.
  • the needle roller bearing 1 of the present invention can increase the roller filling rate to 80 to 100% or less, preferably 93 to 100% or less, even with the holding jig 3. Therefore, it is suitable for applications where multi-row arrangement and applications requiring high-precision rotation are required.
  • the induced thrust load generated by the skew of the rollers also increases.
  • the outer surface of the rim portion 3a is worn and heat is generated.
  • the present invention avoids the occurrence of wear and heat generation on the outer surface of the rim portion 3a.
  • the surface roughness Ra of the outer surface of the rim portion 3a is set to 1.6 ⁇ m or less.
  • the outer surfaces of the rim portions 3a interfere with each other, and an induced thrust load corresponding to the number of bearing rows acts on the outer surfaces of the rim portions 3a. As a result, the possibility that the outer surface of the rim portion 3a will wear and generate heat will further increase.
  • the needle roller bearing 1 of the present invention when used in double rows, it is necessary to set the surface roughness Ra of the outer surface of the rim portion 3a to 0.4 ⁇ m or less in order to further improve reliability. .
  • surface roughness Ra refers to arithmetic mean roughness defined in JIS B 0601:1990.
  • the angle of the rim portion 3a with respect to the outer diameter surface of the holding jig 3 is set to 90° or less so that the rim portion 3a of the holding jig 3 does not spread outward in the axial direction.
  • the moment load applied to On the other hand even if the rim portion 3a of the holding jig 3 falls too far toward the needle roller 2, that is, inward in the axial direction, the needle roller 2 interferes with the rim portion 3a. A value must also be set.
  • W1 is the length from the pocket to the outer surface of the rim portion 3a
  • T is the width of the rim portion 3a
  • L is the length from the inner diameter end of the rim portion 3a to the inner diameter surface of the column portion 3b
  • ⁇ is It is the angle of the rim portion 3 a with respect to the outer diameter surface of the holding jig 3 .
  • the rim portion 3a of the holding jig 3 must satisfy the following formula 2. ⁇ 90° and W 1 ⁇ Tsin ⁇ +Lcos ⁇ Equation 2
  • the induced thrust generated by the roller skew is received by the rim portion 3a, and the outer surface of the rim portion 3a comes into contact with other members.
  • the possibility that the strength of the jig 3 is lowered increases.
  • Equation 5 From Equations 3 and 4, the following Equation 5 must be satisfied in order to suppress a decrease in the strength of the rim portion 3a of the holding jig 3. 0.78 ⁇ (L sin ⁇ +W 2 )/Da ⁇ 1 Equation 5
  • Reference Signs List 1 Bearing 2: Needle roller 3: Holding jig 3a: Rim portion 3b: Column portion 4: Resin sleeve cs: Pocket clearance rs: Roller clearance

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

Abstract

Provided is a needle roller bearing in which detachment of needle rollers does not occur during assembly and which exhibits a roller filling rate equivalent to that of a full complement needle roller bearing. This needle roller bearing comprises a plurality of needle rollers 2 and a holding jig 3 for preventing the needle rollers 2 from detaching. The holding jig 3 has a pair of rim portions 3a disposed on both sides in the axial direction and a plurality of column portions 3b which connect radially outer-side portions of the pair of rim portions 3a to each other at predetermined intervals in the circumferential direction. The pair of rim portions 3a and the column portions 3b form pockets for holding the needle rollers 2. The needle roller bearing is characterized in that: the inner diameter surfaces of the column portions 3b are positioned on the radially outer side with respect to the pitch circle diameter of the needle rollers 2; an inter-roller gap rs between needle rollers 2 on the pitch circle diameter of the needle rollers 2 is set narrower than a pocket gap cs at each contact position between the column portion 3b and the needle roller 2; and a surface roughness Ra of the outer-side surfaces of the rim portions 3a is set to 0.4 μm or less.

Description

針状ころ軸受needle roller bearing
　この発明は、保持器付き針状ころ軸受のように、組み立て時における針状ころのばらけがなく、また、保持器のない総ころタイプの針状ころ軸受と同等のころ充填率を得ることができる、針状ころの保持治具を備えた針状ころ軸受に関する。 Unlike a needle roller bearing with a cage, the present invention does not disperse the needle rollers during assembly, and it is possible to obtain a roller filling rate equivalent to that of a needle roller bearing of a full complement type without a cage. The present invention relates to a needle roller bearing provided with a needle roller holding jig.
　針状ころ軸受において高負荷容量化するためには、ころ充填率を増やす必要がある。 In order to increase the load capacity of needle roller bearings, it is necessary to increase the roller filling rate.
　しかし、従来の保持器付き針状ころ軸受の場合、保持器の柱部が制約となるため、ころ充填率を増加させるには自ずと限界がある。 However, in the case of conventional needle roller bearings with cages, there is a natural limit to increasing the roller filling rate because the columns of the cage are a constraint.
　一方、保持器のない総ころタイプの針状ころ軸受の場合には、ころ充填率を増やすことができるものの、組立て時に、針状ころがばらけるので、組立て性に問題がある。 On the other hand, in the case of a full-complement needle roller bearing without a retainer, although the roller filling rate can be increased, the needle rollers are separated during assembly, which poses a problem in assembly.
　ところで、特許文献１には、保持器付きの針状ころ軸受において、保持器の柱部を、針状ころのピッチ円径（ＰＣＤ）よりも外径側に設けることにより、保持器の柱部の柱幅を薄くし、ころ充填率を増加させるということが開示されている。 By the way, in Patent Document 1, in a needle roller bearing with a retainer, by providing the column portion of the retainer on the outer diameter side of the pitch circle diameter (PCD) of the needle roller, the column portion of the retainer is It is disclosed to reduce the column width of the roller and increase the roller filling factor.
　しかしながら、保持器付き針状ころ軸受は、ころスキューによる誘起スラスト力が発生し、保持器の外側面が他部材と干渉するため、特に、高負荷容量化を目的にして複列で使用する場合には、保持器が軸方向に互いに干渉し合うため、柱強度が必要になる。 However, needle roller bearings with cages generate induced thrust force due to roller skew, and the outer surface of the cage interferes with other members. requires column strength because the cages interfere with each other in the axial direction.
　したがって、特許文献１のように、保持器の柱部の柱幅を薄くしてころ充填率を増やすと、柱強度が犠牲になる可能性が生じる。 Therefore, if the column width of the column portion of the cage is reduced to increase the roller filling rate as in Patent Document 1, column strength may be sacrificed.
　また、特許文献２に開示された保持器付き針状ころ軸受では、保持器の柱強度低下や変形を防止するために、保持器の外側面と他部材との間にスラストワッシャといった規制部材を設けている。 In addition, in the needle roller bearing with retainer disclosed in Patent Document 2, a restricting member such as a thrust washer is provided between the outer surface of the retainer and another member in order to prevent deterioration of column strength and deformation of the retainer. are provided.
　しかしながら、針状ころ軸受の高負荷容量化のために、ころ充填率を増やしたり、複列で使用したりする場合に、針状ころ軸受同士の干渉による保持器の摩耗・発熱を回避するために、保持器の外側面にフランジ、スラストワッシャといった規制部材を設けると、規制部材の厚み分が軸方向に延長されるため、軸方向におけるスペースが大きくなるという問題が生じる。 However, in order to increase the load capacity of the needle roller bearings, when the roller filling rate is increased or double row is used, the wear and heat generation of the cage due to interference between the needle roller bearings is avoided. Furthermore, if a regulating member such as a flange or a thrust washer is provided on the outer surface of the retainer, the thickness of the regulating member extends in the axial direction, resulting in an increase in space in the axial direction.
　また、特許文献３には、自己潤滑性を有したセパレータを配置した総ころ軸受の開示はあるが、セパレータは、ころを保持することができないため、組立て性に問題がある。 In addition, although Patent Document 3 discloses a full complement roller bearing in which a self-lubricating separator is arranged, the separator cannot hold the rollers, so there is a problem in assembly.
特許第６６１３５７６号公報Japanese Patent No. 6613576 特開２０１１－０１２６９９号公報JP 2011-012699 A 特開２０１４－２１９０８４号公報JP 2014-219084 A
　そこで、この発明は、保持器付き針状ころ軸受のように、組み立て時における針状ころのばらけがなく、また、保持器のない総ころタイプの針状ころ軸受と同等のころ充填率を得ることができる、針状ころの保持治具を備えた針状ころ軸受を提供しようとするものである。 Therefore, in the present invention, unlike a needle roller bearing with a cage, the needle rollers do not come apart during assembly, and a roller filling rate equivalent to that of a full complement type needle roller bearing without a cage is obtained. An object of the present invention is to provide a needle roller bearing equipped with a needle roller holding jig capable of
　前記の課題を解決するために、この発明は、複数の針状ころと、前記針状ころを脱落させないための保持治具とを備え、前記保持治具は、軸方向両側に配置された一対のリム部と、前記一対のリム部の径方向外径部同士を、周方向に所定間隔で連結する複数の柱部とを有し、前記一対のリム部と前記複数の柱部とによって針状ころを保持するポケットを形成した針状ころ軸受において、前記柱部の内径面が、前記針状ころのピッチ円径よりも外径側に位置し、前記針状ころのピッチ円径上における針状ころ間のころ間隙間ｒｓが、前記柱部と針状ころとの接点位置における柱部と針状ころ間に形成されるポケット隙間ｃｓよりも狭くしている。 In order to solve the above-described problems, the present invention includes a plurality of needle rollers and a holding jig for preventing the needle rollers from falling off. and a plurality of pillars connecting the radially outer diameter portions of the pair of rims at predetermined intervals in the circumferential direction. In the needle roller bearing in which pockets are formed to hold the needle rollers, the inner diameter surface of the column portion is located on the outer diameter side of the pitch circle diameter of the needle rollers, and An inter-roller clearance rs between the needle rollers is narrower than a pocket clearance cs formed between the pillar and the needle at the contact position between the pillar and the needle.
　このように、この発明では、柱部の内径面を、針状ころのピッチ円径よりも外径側に位置させ、針状ころのピッチ円径上における針状ころ間のころ間隙間ｒｓを、柱部と針状ころとの接点位置における柱部と針状ころ間に形成されるポケット隙間ｃｓよりも狭くしているので、運転中に針状ころがスキューしたとしても、針状ころと柱部とが接触する前に、隣り合う針状ころ同士が接触する。 As described above, in the present invention, the inner diameter surface of the column portion is located on the outer diameter side of the pitch circle diameter of the needle rollers, and the inter-roller gap rs between the needle rollers on the pitch circle diameter of the needle rollers is set to , is narrower than the pocket clearance cs formed between the pillar and the needle roller at the contact position of the pillar and the needle roller, even if the needle roller is skewed during operation, Adjacent needle rollers come into contact with each other before they come into contact with the pillars.
　したがって、この発明の針状ころ軸受では、ころ充填率を増加させることができるので、高負荷容量化が可能になる。 Therefore, in the needle roller bearing of the present invention, it is possible to increase the roller filling rate, so it is possible to increase the load capacity.
　ところが、軸受の高負荷容量化に伴って、ころスキューにより発生する誘起スラスト荷重も大きくなるため、保持治具のリム部の外側面が他部材と強く接触し、リム部の外側面の摩耗・発熱の発生が想定される。 However, as the load capacity of bearings increases, the induced thrust load generated by the skew of the rollers also increases. Heat generation is expected.
　このため、一般的な良好な機械加工の仕上げ面の表面粗さＲａ（算術平均粗さ）は６．３μｍであるところ、この発明では、リム部の外側面の摩耗・発熱の発生を回避するために、リム部の外側面の表面粗さＲａを１．６μｍ以下に設定している。 For this reason, the surface roughness Ra (arithmetic mean roughness) of the finished surface in general good machining is 6.3 μm, but in the present invention, the wear and heat generation of the outer surface of the rim portion can be avoided. For this reason, the surface roughness Ra of the outer surface of the rim portion is set to 1.6 μm or less.
　さらに、この発明の針状ころ軸受を複列で使用する場合には、互いのリム部外側面同士が干渉し合い、リム部外側面に軸受列数分の誘起スラスト荷重が作用することになるため、リム部外側面の摩耗・発熱が発生する可能性がさらに高まる。 Furthermore, when the needle roller bearing of the present invention is used in double rows, the rim portion outer surfaces interfere with each other, and an induced thrust load corresponding to the number of bearing rows acts on the rim portion outer surfaces. Therefore, the possibility of wear and heat generation on the outer surface of the rim increases further.
　したがって、この発明の針状ころ軸受を複列で使用する場合には、さらなる信頼性向上のために、リム部の外側面の表面粗さＲａを０．４μｍ以下に設定する必要がある。 Therefore, when using the needle roller bearing of the present invention in a double row, it is necessary to set the surface roughness Ra of the outer surface of the rim portion to 0.4 μm or less in order to further improve reliability.
　この発明において、表面粗さＲａは、ＪＩＳ Ｂ ０６０１：１９９０で規定される算術平均粗さをいう。 In the present invention, surface roughness Ra refers to arithmetic mean roughness defined in JIS B 0601:1990.
　次に、この発明の針状ころ軸受において、保持治具のリム部が、内径端が軸方向外側に広がったように傾いていると、ころスキューにより発生する誘起スラストは保持治具のリム部で受け、その荷重点位置は径方向内側へ移動する。荷重点位置が径方向内側へ移動すると柱部にかかるモーメント荷重が大きくなるため、保持治具の強度低下の可能性が高まる。 Next, in the needle roller bearing of the present invention, if the rim portion of the holding jig is inclined such that the inner diameter end spreads outward in the axial direction, the induced thrust generated by the roller skew is reduced by the rim portion of the holding jig. , and the load point position moves radially inward. If the load point position moves inward in the radial direction, the moment load applied to the pillar increases, which increases the possibility that the strength of the holding jig will decrease.
　したがって、この発明では、保持治具のリム部が軸方向外側に広がらないように、保持部材の外径面に対するリム部の角度を９０°以下に設定して、柱部にかかるモーメント荷重を小さくしなければならない。一方、保持治具のリム部が針状ころ側、すなわち、軸方向内側に倒れすぎても、針状ころとリム部が干渉するので、軸方向内側への倒れ角度の下限値も設定する必要がある。 Therefore, in the present invention, the angle of the rim portion with respect to the outer diameter surface of the holding member is set to 90° or less so that the rim portion of the holding jig does not expand axially outward, thereby reducing the moment load applied to the column portion. Must. On the other hand, if the rim portion of the holding jig tilts too far toward the needle roller side, that is, inward in the axial direction, the needle roller and the rim portion interfere with each other, so it is necessary to set the lower limit of the angle of inclination toward the inner side in the axial direction. There is
　このリム部の軸方向内側への倒れ角度の下限値は、次の式１で規定することができる。
　　　Ｗ1＜Ｔｓｉｎθ+Ｌｃｏｓθ・・・式１ The lower limit of the inclination angle of the rim toward the inside in the axial direction can be defined by the following equation (1).
W 1 <Tsin θ+L cos θ Expression 1
　式１において、Ｗ1はポケットからリム部の外側面までの長さ、Ｔはリム部の板厚、Ｌはリム部の内径端から柱部の内径面までの長さ、θは保持治具の外径面に対するリム部の角度である。 In formula 1, W1 is the length from the pocket to the outer surface of the rim, T is the plate thickness of the rim, L is the length from the inner diameter end of the rim to the inner diameter of the column, and θ is the holding jig. is the angle of the rim with respect to the outer diameter surface of the
　したがって、この発明では、保持治具のリム部が、次の式２を満たす必要がある。
　　　θ≦９０°かつＷ1＜Ｔｓｉｎθ+Ｌｃｏｓθ・・・式２ Therefore, in the present invention, the rim portion of the holding jig must satisfy the following formula 2.
θ≦90° and W 1 <Tsin θ+Lcos θ Equation 2
　また、この発明では、ころスキューにより発生する誘起スラストは、リム部で受け、リム部の幅面が他部材と接触するため、リム部の長さを十分に確保しなければ、保持治具の強度低下の可能性が高まる。したがって、保持治具の強度を向上させるためには、リム部の長さＬと針状ころのころ径Ｄａとの関係を、次の式を満足するようにする。
　　　０．７８≦（Ｌｓｉｎθ＋Ｗ2）／Ｄａ＜1
　なお、Ｗ2は、保持治具の外径面からリム部の外径端までの長さである。 In addition, in the present invention, the induced thrust generated by the roller skew is received by the rim portion, and the width surface of the rim portion comes into contact with other members. more likely to decline. Therefore, in order to improve the strength of the holding jig, the relationship between the length L of the rim portion and the diameter Da of the needle roller should satisfy the following equation.
0.78≦(L sin θ+W 2 )/Da<1
W2 is the length from the outer diameter surface of the holding jig to the outer diameter end of the rim portion.
　以上のように、この発明に係る針状ころ軸受は、柱部の内径面を、針状ころのピッチ円径よりも外径側に位置させ、針状ころのピッチ円径上における針状ころ間のころ間隙間ｒｓを、柱部と針状ころとの接点位置における柱部と針状ころ間に形成されるポケット隙間ｃｓよりも狭くしているので、運転中に針状ころがスキューしたとしても、針状ころと柱部とが接触する前に、隣り合う針状ころ同士が接触する。 As described above, in the needle roller bearing according to the present invention, the inner diameter surface of the column portion is located on the outer diameter side of the pitch circle diameter of the needle rollers, and the needle rollers are positioned above the pitch circle diameter of the needle rollers. Since the inter-roller gap rs is narrower than the pocket gap cs formed between the column and the needle roller at the point of contact between the column and the needle roller, the needle rollers are skewed during operation. However, the adjacent needle rollers come into contact with each other before the needle rollers and the pillars come into contact with each other.
　このため、柱部への負荷が小さく、柱部の幅を細くして、ピッチ円径上に総ころ状態まで針状ころを配列することが可能となり、例えば、ころ充填率を８０～１００％以下、好ましくは９３～１００％以下まで増加させることも可能になる。 For this reason, the load on the column is small, and the width of the column can be narrowed so that the needle rollers can be arranged on the pitch circle diameter up to the full roller state. Thereafter, it is possible to increase it to preferably 93 to 100% or less.
　また、この発明では、リム部の外側面の表面粗さＲａを１．６μｍ以下に設定することにより、リム部の外側面の摩耗・発熱の発生を回避している。 Also, in the present invention, by setting the surface roughness Ra of the outer surface of the rim portion to 1.6 μm or less, the wear and heat generation of the outer surface of the rim portion are avoided.
　さらに、リム部の外側面の表面粗さＲａを０．４μｍ以下に設定することにより、リム部外側面に軸受列数分の誘起スラスト荷重が作用することになっても、リム部外側面の摩耗・発熱の可能性を回避することができる。 Furthermore, by setting the surface roughness Ra of the outer surface of the rim portion to 0.4 μm or less, even if the induced thrust load corresponding to the number of bearing rows acts on the outer surface of the rim portion, Possible wear and heat generation can be avoided.
この発明の実施形態に係る針状ころ軸受の斜視図である。1 is a perspective view of a needle roller bearing according to an embodiment of the invention; FIG. 図１の針状ころ軸受の側面図である。2 is a side view of the needle roller bearing of FIG. 1; FIG. 図１の針状ころ軸受を軸心に対して直交する面で切断した断面図である。2 is a cross-sectional view of the needle roller bearing of FIG. 1 taken along a plane perpendicular to the axis; FIG. この発明の実施形態に係る針状ころ軸受の柱部と針状ころとの関係を示す拡大図である。FIG. 4 is an enlarged view showing the relationship between the column portion and the needle rollers of the needle roller bearing according to the embodiment of the present invention; この発明の実施形態に係る針状ころ軸受の針状ころとリム部のとの関係を示す部分拡大図である。FIG. 3 is a partially enlarged view showing the relationship between the needle rollers and the rim portion of the needle roller bearing according to the embodiment of the invention;
　以下、この発明の実施の形態を添付図面に基づいて説明する。 Embodiments of the present invention will be described below with reference to the accompanying drawings.
　この発明に係る針状ころ軸受１は、図１～図３に示すように、複数の針状ころ２と、針状ころ２を脱落させないための保持治具３とを備え、周方向に配列された針状ころ２の内径側に、組立ての際に、針状ころ２のばらけを防止する樹脂スリーブ４を嵌めている。 As shown in FIGS. 1 to 3, a needle roller bearing 1 according to the present invention includes a plurality of needle rollers 2 and a holding jig 3 for preventing the needle rollers 2 from falling off. A resin sleeve 4 is fitted on the inner diameter side of the needle rollers 2 to prevent the needle rollers 2 from coming apart during assembly.
　前記保持治具３は、軸方向両側に配置された一対のリム部３ａと、前記一対のリム部３ａの径方向外側部同士を、周方向に所定間隔で連結する複数の柱部３ｂとを有し、前記一対のリム部３ａと前記複数の柱部３ｂとによって針状ころ２を保持する複数のポケットを形成している。 The holding jig 3 includes a pair of rims 3a arranged on both sides in the axial direction, and a plurality of pillars 3b connecting the radially outer sides of the pair of rims 3a at predetermined intervals in the circumferential direction. A plurality of pockets for holding the needle rollers 2 are formed by the pair of rim portions 3a and the plurality of column portions 3b.
　前記柱部３ｂの内径面は、周方向に配列された針状ころ２のピッチ円径（ＰＣＤ）よりも外径側に位置している。 The inner diameter surface of the column portion 3b is located on the outer diameter side of the pitch circle diameter (PCD) of the needle rollers 2 arranged in the circumferential direction.
　この発明では、図４に示すように、ピッチ円径上における針状ころ２間に形成される、ころ間隙間ｒｓを、柱部３ｂと針状ころ２との接点位置における柱部と針状ころ間に形成されるポケット隙間ｃｓよりも狭く、すなわち、ｒｓ＜ｃｓに設定している。 In the present invention, as shown in FIG. 4, the inter-roller gap rs, which is formed between the needle rollers 2 on the pitch circle diameter, is set to the position where the column portion 3b and the needle roller 2 contact each other. It is set to be narrower than the pocket clearance cs formed between the rollers, that is, rs<cs.
　ころ間隙間ｒｓとは、ピッチ円径上に均等に針状ころ２を配列した際における隣り合う針状ころ２同士の間に形成される隙間であり、ピッチ円径の円周長さから針状ころ２の直径Ｄの総和の長さを引いた値を、針状ころ２の総数で割って求めることができる。 The inter-roller clearance rs is a clearance formed between the adjacent needle rollers 2 when the needle rollers 2 are evenly arranged on the pitch circle diameter. It can be obtained by dividing the value obtained by subtracting the total length of the diameter D of the shaped rollers 2 by the total number of the needle rollers 2 .
　また、ポケット隙間ｃｓとは、針状ころ２と柱部３ｂとの接点位置における柱部３ｂの接点から針状ころ２の接点までの距離であり、ピッチ円径上に針状ころ２を均等に配列した状態において、針状ころ２と柱部３ｂとの接点位置における柱間距離から、針状ころ２と柱部３ｂとの接点位置における針状ころ２の径を引いた長さの１／２で求めることができる。 Further, the pocket clearance cs is the distance from the point of contact of the column portion 3b to the point of contact of the needle roller 2 at the contact position between the needle roller 2 and the column portion 3b. 1 of the length obtained by subtracting the diameter of the needle roller 2 at the contact position between the needle roller 2 and the column portion 3b from the inter-column distance at the contact position between the needle roller 2 and the column portion 3b when the needle roller 2 and the column portion 3b are arranged in the state of /2.
　前記のように、ころ間隙間ｒｓをポケット隙間ｃｓよりも狭く設定すると、運転中に針状ころ２がスキューしたとしても、針状ころ２と柱部３ｂとが接触する前に、隣り合う針状ころ２同士が接触するので、柱部３ｂへの負荷を小さくすることができる。したがって、柱部３ｂの柱幅を細くして、ピッチ円径上に総ころ状態まで針状ころ２を配列することが可能となり、例えば、ころ充填率を８０～１００％以下、好ましくは９３～１００％以下まで増加させることも可能になる。 As described above, if the inter-roller clearance rs is set narrower than the pocket clearance cs, even if the needle rollers 2 are skewed during operation, the adjacent needles will be separated before the needle rollers 2 and the column portion 3b come into contact with each other. Since the shaped rollers 2 are in contact with each other, the load on the column portion 3b can be reduced. Therefore, it is possible to reduce the column width of the column portion 3b and arrange the needle rollers 2 up to a full roller state on the pitch circle diameter. It is also possible to increase it to 100% or less.
　ここで、ころ充填率とは、ピッチ円径上に配列された針状ころ２の直径Ｄａの総和と、針状ころのピッチ円径の円周長さとの比率であり、ピッチ円径上に針状ころ２を隙間なく配列した状態で、ころ充填率が１００％になる。 Here, the roller packing ratio is the ratio of the sum of the diameters Da of the needle rollers 2 arranged on the pitch circle diameter to the circumferential length of the pitch circle diameter of the needle rollers. When the needle rollers 2 are arranged without gaps, the roller filling rate is 100%.
　この発明では、前記柱部３ｂの内径面が、ピッチ円径よりも外径側に設けられているので、保持治具３が外径案内となり、保持治具３の強度と剛性を高く維持することができる。 In this invention, since the inner diameter surface of the column portion 3b is provided on the outer diameter side of the pitch circle diameter, the holding jig 3 serves as an outer diameter guide, and the strength and rigidity of the holding jig 3 are maintained high. be able to.
　また、図３および図４に示すように、柱部３ｂは、両側面の形状が内径側から外径側に向かって傾斜するテーパ形状、すなわち、柱部３ｂの内径側の幅よりも外径側の幅を広くすることにより、柱部３ｂの断面積を稼ぎ、柱部３ｂの強度を確保している。 Moreover, as shown in FIGS. 3 and 4, the column portion 3b has a tapered shape in which both side surfaces are inclined from the inner diameter side toward the outer diameter side. By widening the width of the side, the cross-sectional area of the column portion 3b is increased and the strength of the column portion 3b is ensured.
　保持治具３は、樹脂製または鋼板製である。保持治具３の柱部３ｂは、側面をフライス加工によってテーパ形状にしても良いが、コスト面を考えると、プレス加工した後、後加工で面押しによってテーパ形状にするようにしても良い。 The holding jig 3 is made of resin or steel plate. The column portion 3b of the holding jig 3 may be formed into a tapered shape by milling the side surface, but in consideration of the cost, it may be formed into a tapered shape by pressing after press processing.
　以上のように、この発明の針状ころ軸受１は、保持治具３付きであっても、ころ充填率を８０～１００％以下、好ましくは９３～１００％以下まで増加させることが可能であるので、多列配列される用途や高精度回転が要求される用途に適したものになる。 As described above, the needle roller bearing 1 of the present invention can increase the roller filling rate to 80 to 100% or less, preferably 93 to 100% or less, even with the holding jig 3. Therefore, it is suitable for applications where multi-row arrangement and applications requiring high-precision rotation are required.
　この発明の針状ころ軸受１は、軸受の高負荷容量化に伴って、ころスキューにより発生する誘起スラスト荷重も大きくなるため、保持治具３のリム部３ａの外側面が他部材と強く接触し、リム部３ａの外側面の摩耗・発熱の発生が想定される。 In the needle roller bearing 1 of the present invention, as the load capacity of the bearing increases, the induced thrust load generated by the skew of the rollers also increases. However, it is assumed that the outer surface of the rim portion 3a is worn and heat is generated.
　このため、一般的な良好な機械加工の仕上げ面の表面粗さＲａ（算術平均粗さ）は６．３μｍであるところ、この発明では、リム部３ａの外側面の摩耗・発熱の発生を回避するために、リム部３ａの外側面の表面粗さＲａを１．６μｍ以下に設定している。 For this reason, while the surface roughness Ra (arithmetic mean roughness) of the finished surface of a generally good machined surface is 6.3 μm, the present invention avoids the occurrence of wear and heat generation on the outer surface of the rim portion 3a. For this purpose, the surface roughness Ra of the outer surface of the rim portion 3a is set to 1.6 μm or less.
　さらに、この発明の針状ころ軸受を複列で使用する場合には、互いのリム部３ａの外側面同士が干渉し合い、リム部３ａの外側面に軸受列数分の誘起スラスト荷重が作用することになるため、リム部３ａの外側面の摩耗・発熱が発生する可能性がさらに高まる。 Further, when the needle roller bearing of the present invention is used in double rows, the outer surfaces of the rim portions 3a interfere with each other, and an induced thrust load corresponding to the number of bearing rows acts on the outer surfaces of the rim portions 3a. As a result, the possibility that the outer surface of the rim portion 3a will wear and generate heat will further increase.
　したがって、この発明の針状ころ軸受１を複列で使用する場合には、さらなる信頼性向上のために、リム部３ａの外側面の表面粗さＲａを０．４μｍ以下に設定する必要がある。 Therefore, when the needle roller bearing 1 of the present invention is used in double rows, it is necessary to set the surface roughness Ra of the outer surface of the rim portion 3a to 0.4 μm or less in order to further improve reliability. .
　この発明において、表面粗さＲａは、ＪＩＳ Ｂ ０６０１：１９９０で規定される算術平均粗さをいう。 In the present invention, surface roughness Ra refers to arithmetic mean roughness defined in JIS B 0601:1990.
　次に、この発明の針状ころ軸受１において、保持治具３のリム部３ａが、内径端が軸方向外側に広がったように傾いていると、図５に示すように、ころスキューにより発生する誘起スラストは保持治具３のリム部３ａで受け、その荷重点位置は径方向内側へ移動する。荷重点位置が径方向内側へ移動すると柱部３ｂにかかるモーメント荷重が大きくなるため、保持治具３の強度低下の可能性が高まる。 Next, in the needle roller bearing 1 of the present invention, if the rim portion 3a of the holding jig 3 is inclined such that the inner diameter end spreads outward in the axial direction, a roller skew occurs as shown in FIG. The induced thrust is received by the rim portion 3a of the holding jig 3, and the load point position moves radially inward. If the position of the load point moves radially inward, the moment load applied to the column portion 3b increases, and the possibility of the strength of the holding jig 3 decreasing increases.
　したがって、この発明では、保持治具３のリム部３ａが軸方向外側に広がらないように、保持治具３の外径面に対するリム部３ａの角度を９０°以下に設定して、柱部３ｂにかかるモーメント荷重を小さくしなければならない。一方、保持治具３のリム部３ａが針状ころ２側、すなわち、軸方向内側に倒れすぎても、針状ころ２とリム部３ａが干渉するので、軸方向内側への倒れ角度の下限値も設定する必要がある。 Therefore, in the present invention, the angle of the rim portion 3a with respect to the outer diameter surface of the holding jig 3 is set to 90° or less so that the rim portion 3a of the holding jig 3 does not spread outward in the axial direction. The moment load applied to On the other hand, even if the rim portion 3a of the holding jig 3 falls too far toward the needle roller 2, that is, inward in the axial direction, the needle roller 2 interferes with the rim portion 3a. A value must also be set.
　このリム部３ａの軸方向内側への倒れ角度θの下限値は、次の式１で規定することができる。
　　　Ｗ1＜Ｔｓｉｎθ+Ｌｃｏｓθ・・・式１ The lower limit value of the tilt angle .theta.
W 1 <Tsin θ+L cos θ Expression 1
　式１において、Ｗ1はポケットからリム部３ａの外側面までの長さ、Ｔはリム部３ａの幅、Ｌはリム部３ａの内径端から柱部３ｂの内径面までの長さ、θは保持治具３の外径面に対するリム部３ａの角度である。 In Equation 1, W1 is the length from the pocket to the outer surface of the rim portion 3a, T is the width of the rim portion 3a, L is the length from the inner diameter end of the rim portion 3a to the inner diameter surface of the column portion 3b, and θ is It is the angle of the rim portion 3 a with respect to the outer diameter surface of the holding jig 3 .
　したがって、この発明では、保持治具３のリム部３ａが、次の式２を満たす必要がある。
　　　θ≦９０°かつＷ1＜Ｔｓｉｎθ+Ｌｃｏｓθ・・・式２ Therefore, in the present invention, the rim portion 3a of the holding jig 3 must satisfy the following formula 2.
θ≦90° and W 1 <Tsin θ+Lcos θ Equation 2
　また、この発明では、ころスキューにより発生する誘起スラストは、リム部３ａで受け、リム部３ａの外側面が他部材と接触するため、リム部３ａの長さを十分に確保しなければ、保持治具３の強度低下の可能性が高まる。 Further, in the present invention, the induced thrust generated by the roller skew is received by the rim portion 3a, and the outer surface of the rim portion 3a comes into contact with other members. The possibility that the strength of the jig 3 is lowered increases.
　このため、保持治具３の幅面と他部材が強く接触するような評価試験において、保持治具３のリム部３ａの長さＬを変動させ、保持治具３の破損状態を確認した。保持治具３の破損状態の評価結果を表１に示す。なお、Ｗ2は、保持治具３の外径面からリム部３ａの外径端までの長さである。 For this reason, in an evaluation test in which the width surface of the holding jig 3 and other members strongly contact each other, the length L of the rim portion 3a of the holding jig 3 was varied to confirm the state of breakage of the holding jig 3 . Table 1 shows the evaluation results of the damage state of the holding jig 3 . W2 is the length from the outer diameter surface of the holding jig 3 to the outer diameter end of the rim portion 3a.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　（Ｌｓｉｎθ＋Ｗ2）／Ｄａ≦０．７７の場合、保持治具３のリム部３ａに破損が認められたが、（Ｌｓｉｎθ＋Ｗ2）／Ｄａ≧０．７８の場合、保持治具３のリム部３ａに破損は認められない。したがって、保持治具３のリム部３ａの長さＬを所定の寸法にすることで、保持部材３のリム部３ａの破損を抑制する。 When (L sin θ+W 2 )/Da≦0.77, the rim portion 3a of the holding jig 3 was damaged . No damage is allowed. Therefore, by setting the length L of the rim portion 3a of the holding jig 3 to a predetermined size, damage to the rim portion 3a of the holding member 3 is suppressed.
　したがって、保持治具３の強度を向上させるためには、リム部３ａの長さＬと針状ころ２のころ径Ｄａとの関係を、次のように規定する必要がある。
　　　（Ｌｓｉｎθ＋Ｗ2）／Ｄａ≧０．７８・・・式３ Therefore, in order to improve the strength of the holding jig 3, it is necessary to define the relationship between the length L of the rim portion 3a and the roller diameter Da of the needle roller 2 as follows.
(L sin θ+W 2 )/Da≧0.78 Equation 3
　また、運転中に保持治具３が軸４およびハウジング５に接触することによる保持治具３の強度低下を回避するために、以下の式を満たさなければいけない。
　　　（Ｌｓｉｎθ＋Ｗ2）／Ｄａ＜1・・・式４ Also, in order to avoid a decrease in the strength of the holding jig 3 due to contact of the holding jig 3 with the shaft 4 and the housing 5 during operation, the following formula must be satisfied.
(L sin θ + W 2 )/Da<1 Equation 4
　式３、４より、保持治具３のリム部３ａの強度低下を抑制するためには以下の式５を満たさなければいけない。
　　　０．７８≦（Ｌｓｉｎθ＋Ｗ2）／Ｄａ＜1・・・式５ From Equations 3 and 4, the following Equation 5 must be satisfied in order to suppress a decrease in the strength of the rim portion 3a of the holding jig 3.
0.78≦(L sin θ+W 2 )/Da<1 Equation 5
　この発明は前述した実施形態に何ら限定されるものではなく、この発明の要旨を逸脱しない範囲において、さらに種々の形態で実施し得ることは勿論のことであり、本発明の範囲は、特許請求の範囲によって示され、さらに特許請求の範囲に記載の均等の意味、および範囲内の全ての変更を含む。 The present invention is by no means limited to the above-described embodiments, and can of course be embodied in various forms without departing from the gist of the present invention. and includes equivalents and all changes within the scope of the claims.
１　　：軸受
２　　：針状ころ
３　　：保持治具
３ａ　：リム部
３ｂ　：柱部
４　　：樹脂スリーブ
ｃｓ　：ポケット隙間
ｒｓ　：ころ間隙間  Reference Signs List 1: Bearing 2: Needle roller 3: Holding jig 3a: Rim portion 3b: Column portion 4: Resin sleeve cs: Pocket clearance rs: Roller clearance

Claims (4)

  1. 　複数の針状ころと、前記針状ころを脱落させないための保持治具とを備え、前記保持治具は、軸方向両側に配置された一対のリム部と、前記一対のリム部の径方向外側部同士を、周方向に所定間隔で連結する複数の柱部とを有し、前記一対のリム部と前記複数の柱部とによって針状ころを保持するポケットを形成した針状ころ軸受において、前記柱部の内径面が、前記針状ころのピッチ円径よりも外径側に位置し、前記針状ころのピッチ円径上における針状ころ間のころ隙間ｒｓが、前記柱部と針状ころとの接点位置における柱部と針状ころ間に形成されるポケット隙間ｃｓよりも狭く、リム部の外側面の表面粗さＲａを１．６μｍ以下に設定していることを特徴とする針状ころ軸受。 A plurality of needle rollers and a holding jig for preventing the needle rollers from falling off are provided. A needle roller bearing having a plurality of pillars that connect outer side portions to each other at predetermined intervals in a circumferential direction, wherein the pair of rims and the plurality of pillars form pockets for holding the needle rollers. , the inner diameter surface of the column portion is located on the outer diameter side of the pitch circle diameter of the needle rollers, and the roller gap rs between the needle rollers on the pitch circle diameter of the needle rollers is equal to the column portion. It is narrower than the pocket gap cs formed between the column and the needle roller at the contact position with the needle roller, and the surface roughness Ra of the outer surface of the rim portion is set to 1.6 μm or less. needle roller bearings.
  2. 　前記リム部の外側面の表面粗さＲａを０．４μｍ以下に設定していることを特徴とする請求項１に記載の針状ころ軸受。 The needle roller bearing according to claim 1, characterized in that the surface roughness Ra of the outer surface of the rim portion is set to 0.4 µm or less.
  3. 　前記保持治具のリム部が、次の関係式を満たす請求項１または２に記載の針状ころ軸受。
    　　　θ≦９０°かつＷ1＜Ｔｓｉｎθ+Ｌｃｏｓθ
    　ただし、Ｗ1はポケットからリム部の外側面までの長さ、Ｔはリム部の板厚、Ｌはリム部の内径端から柱部の内径面までの長さ、θは保持治具の外径面に対するリム部の角度である。     3. The needle roller bearing according to claim 1, wherein the rim portion of said holding jig satisfies the following relational expression.
    θ≦90° and W 1 <Tsin θ+L cos θ
    However, W1 is the length from the pocket to the outer surface of the rim, T is the thickness of the rim, L is the length from the inner diameter end of the rim to the inner diameter of the column, and θ is the outside of the holding jig. This is the angle of the rim with respect to the radial plane.
  4. 　前記保持治具のリム部の長さＬと針状ころのころ径Ｄａとが、次の関係式を満たす請求項１～３のいずれかに記載の針状ころ軸受。
    　　　０．７８≦（Ｌｓｉｎθ＋Ｗ2）／Ｄａ＜1
    　ただし、Ｗ2は、保持治具の外径面からリム部の外径端までの長さである。     The needle roller bearing according to any one of claims 1 to 3, wherein the length L of the rim portion of the holding jig and the roller diameter Da of the needle roller satisfy the following relational expression.
    0.78≦(L sin θ+W 2 )/Da<1
    However, W2 is the length from the outer diameter surface of the holding jig to the outer diameter end of the rim portion.
PCT/JP2022/032424 2021-09-10 2022-08-29 Needle roller bearing WO2023037918A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000074071A (en) * 1998-08-28 2000-03-07 Nippon Seiko Kk Cage and roller
JP2005106211A (en) * 2003-09-30 2005-04-21 Ntn Corp Roller with retainer
JP2011137500A (en) * 2009-12-28 2011-07-14 Ntn Corp Roller with retainer and molding method of the resin retainer
JP2021080973A (en) * 2019-11-15 2021-05-27 日本精工株式会社 Rolling bearing and method for manufacturing the same
JP2022144638A (en) * 2021-03-19 2022-10-03 Ntn株式会社 needle roller bearing

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000074071A (en) * 1998-08-28 2000-03-07 Nippon Seiko Kk Cage and roller
JP2005106211A (en) * 2003-09-30 2005-04-21 Ntn Corp Roller with retainer
JP2011137500A (en) * 2009-12-28 2011-07-14 Ntn Corp Roller with retainer and molding method of the resin retainer
JP2021080973A (en) * 2019-11-15 2021-05-27 日本精工株式会社 Rolling bearing and method for manufacturing the same
JP2022144638A (en) * 2021-03-19 2022-10-03 Ntn株式会社 needle roller bearing

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