JP2006144921A - Rolling bearing - Google Patents

Rolling bearing Download PDF

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Publication number
JP2006144921A
JP2006144921A JP2004336052A JP2004336052A JP2006144921A JP 2006144921 A JP2006144921 A JP 2006144921A JP 2004336052 A JP2004336052 A JP 2004336052A JP 2004336052 A JP2004336052 A JP 2004336052A JP 2006144921 A JP2006144921 A JP 2006144921A
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balls
bearing
rolling bearing
outer ring
cylindrical rollers
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Takiyoshi Yamada
滝義 山田
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NSK Ltd
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NSK Ltd
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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
    • F16C19/49—Bearings with both balls and rollers

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

Abstract

<P>PROBLEM TO BE SOLVED: To combine a deep groove ball bearing and a cylindrical roller bearing to be functioned as one bearing without increasing installing spaces and assembling man-hours. <P>SOLUTION: Two types of rolling elements, balls 3 and cylindrical rollers 4, are rollingly laid between an inner ring 1 and an outer ring 2. The balls 3 and the cylindrical rollers 4 are alternately arranged in the peripheral direction. A recessed groove face 5 of the inner ring 1 serves as a raceway surface for the balls 3. Outer diameter faces 6, 6 on both sides serve as raceway surfaces for the cylindrical rollers 4. A recessed groove face 7 of the outer ring 2 serves as a raceway surface for the balls 3. Inner diameter faces 8, 8 on both sides serve as raceway surfaces for the cylindrical rollers 4. A cage 10 has two types of pockets 11, 12 for the balls 3 and the cylindrical rollers 4 in one cage itself. In this construction, radial load is mainly supported by the cylindrical rollers 4 and axial load is mainly supported by the balls 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、深みぞ玉軸受と円筒ころ軸受を組合せて使用する転がり軸受に関する。   The present invention relates to a rolling bearing using a combination of a deep groove ball bearing and a cylindrical roller bearing.

深みぞ玉軸受と円筒ころ軸受を組合せて使用する転がり軸受としては、特許文献１に開示してあるように、その構成は、異なる軌道面を半径方向に設け、玉と円筒ころを組み込むものであり、保持器は、一体ではなく別々である。   As disclosed in Patent Document 1, as a rolling bearing using a combination of a deep groove ball bearing and a cylindrical roller bearing, the configuration is such that different raceway surfaces are provided in the radial direction and the ball and the cylindrical roller are incorporated. Yes, the cage is not integral but separate.

また、特許文献２では、複列軸受に於いて、軸方向に、玉ところを組み込むものであり、回転軸と外輪の間に介装した複数の玉と複数のころを備え、各ころを転動可能に保持する保持器が外輪の内周面に設けた係合部に係合してある。   In Patent Document 2, a ball bearing is incorporated in the axial direction in a double row bearing, and includes a plurality of balls and a plurality of rollers interposed between a rotating shaft and an outer ring. A cage that is held movably is engaged with an engaging portion provided on the inner peripheral surface of the outer ring.

さらに、特許文献３では、自動調心ころと玉とを備え、ころと玉は、周方向に交互に配設してある。   Furthermore, Patent Document 3 includes self-aligning rollers and balls, and the rollers and balls are alternately arranged in the circumferential direction.

図４（ａ）は、従来例に係り、深みぞ玉軸受と円筒ころ軸受を組合せて使用する転がり軸受の一部破断の斜視図であり、（ｂ）は、その断面図である。   FIG. 4A is a partially broken perspective view of a rolling bearing that uses a combination of a deep groove ball bearing and a cylindrical roller bearing according to a conventional example, and FIG. 4B is a cross-sectional view thereof.

深みぞ玉軸受と円筒ころ軸受を組合せて使用する転がり軸受では、深みぞ玉軸受２０と、円筒ころ軸受３０とが軸方向に並列して設けてある。   In a rolling bearing using a combination of a deep groove ball bearing and a cylindrical roller bearing, the deep groove ball bearing 20 and the cylindrical roller bearing 30 are provided in parallel in the axial direction.

一方の深みぞ玉軸受２０は、内輪２１と、外輪２２と、内・外輪２１，２２の間に転動自在に介装した玉２３と、玉２３を所定間隔に保持する保持器２４と、具備している。   One deep groove ball bearing 20 includes an inner ring 21, an outer ring 22, a ball 23 interposed between the inner and outer rings 21 and 22, a cage 24 that holds the balls 23 at a predetermined interval, It has.

また、円筒ころ軸受３０は、内輪３１と、外輪３２と、内・外輪３１，３２の間に転動自在に介装した円筒ころ３３と、円筒ころ３３を所定間隔に保持する保持器３４と、具備している。
特開平１１−３７１４５号公報 特開平１１−３７１４９号公報 独特許 ＤＥ １０２ ２５ ５７２ Ａ１号公報 The cylindrical roller bearing 30 includes an inner ring 31, an outer ring 32, a cylindrical roller 33 interposed between the inner and outer rings 31 and 32, and a cage 34 that holds the cylindrical roller 33 at a predetermined interval. It has.
JP 11-37145 A JP 11-37149 A German patent DE 102 25 572 A1

しかしながら、深みぞ玉軸受２０と、円筒ころ軸受３０を組み合せて使用する場合、その幅分のスペースが必要となる。   However, when the deep groove ball bearing 20 and the cylindrical roller bearing 30 are used in combination, a space corresponding to the width is required.

また、２つの軸受２０，３０を組み込む必要があり、当然ながら、その組み立て工数が必要であり、製造コストの高騰を招来するといったことがある。   In addition, it is necessary to incorporate the two bearings 20 and 30. Of course, the number of assembling steps is necessary, which may lead to an increase in manufacturing cost.

本発明は、上述したような事情に鑑みてなされたものであって、組み込みスペース、組み立て工数を増やすことなく、深みぞ玉軸受と円筒ころ軸受の機能を１つの軸受に集約することができる、転がり軸受を提供することを目的とする。   The present invention has been made in view of the circumstances as described above, and can integrate the functions of the deep groove ball bearing and the cylindrical roller bearing into one bearing without increasing the installation space and assembly man-hours. An object is to provide a rolling bearing.

上記の目的を達成するため、本発明の請求項１に係る転がり軸受は、内輪と、外輪との間に、玉と円筒ころとの二種類の転動体を転動自在に介装した転がり軸受に於いて、
一つの保持器に、玉と円筒ころの二種類のポケットを設けて、転動体を保持することを特徴とする。 In order to achieve the above object, a rolling bearing according to claim 1 of the present invention is a rolling bearing in which two kinds of rolling elements of a ball and a cylindrical roller are interposed between an inner ring and an outer ring so as to freely roll. In
One cage is provided with two types of pockets, balls and cylindrical rollers, to hold the rolling elements.

本発明の請求項２に係る転がり軸受は、円筒ころの転動体は、外輪の内径面と内輪の外径面を、軌道レ−ス面として使用することを特徴とする。   The rolling bearing according to claim 2 of the present invention is characterized in that the rolling element of the cylindrical roller uses the inner diameter surface of the outer ring and the outer diameter surface of the inner ring as raceway race surfaces.

本発明の請求項３に係る転がり軸受は、玉の転動体は、外輪の凹溝加工面と内輪の凹溝加工面を、軌道レース面として使用することを特徴とする。   The rolling bearing according to claim 3 of the present invention is characterized in that the ball rolling element uses the grooved surface of the outer ring and the grooved surface of the inner ring as raceway race surfaces.

本発明の請求項４に係る転がり軸受は、負荷荷重は、ラジアル荷重を円筒ころで受け、アキシアル荷重は、玉で受けることを特徴とする。   A rolling bearing according to a fourth aspect of the present invention is characterized in that the load is received by a cylindrical roller and the axial load is received by a ball.

本発明の請求項５に係る転がり軸受は、外輪もしくは内輪の一方は、２つ割れに設定してあることを特徴とする。   The rolling bearing according to claim 5 of the present invention is characterized in that one of the outer ring and the inner ring is set to be broken into two.

本発明によれば、一つの保持器に、玉と円筒ころの二種類のポケットを設けて、転動体を保持することから、組み込みスペース、組み立て工数を増やすことなく、深みぞ玉軸受と円筒ころ軸受の機能を１つの軸受に集約することができる。そのため、組み込みスペースと組み立て性の面で有利である。   According to the present invention, since two types of pockets of a ball and a cylindrical roller are provided in one cage to hold the rolling elements, the deep groove ball bearing and the cylindrical roller are increased without increasing the installation space and assembly man-hours. The functions of the bearing can be integrated into one bearing. Therefore, it is advantageous in terms of installation space and assembly.

また、一つの保持器のポケットに、玉と円筒ころを組み込み、一体型となっているため、軸受構成部品を少なくすることができると同時に、組合せ軸受では、必要な差幅管理と加工を省略できる。   In addition, since the ball and cylindrical roller are integrated in the pocket of one cage and integrated, the number of bearing components can be reduced. it can.

さらに、軸受のコストダウンに効果がある。すなわち、部品点数を少なくすることで、部品コストの低減を図ることができ、製造工程が少なくなり、生産性の向上を図ることができる。   Furthermore, it is effective in reducing the cost of the bearing. That is, by reducing the number of parts, the part cost can be reduced, the number of manufacturing steps can be reduced, and the productivity can be improved.

以下、本発明の実施の形態に係る転がり軸受を図面を参照しつつ説明する。   Hereinafter, a rolling bearing according to an embodiment of the present invention will be described with reference to the drawings.

（実施の形態）
図１（ａ）は、本発明の実施の形態に係る転がり軸受の断面図であり、（ｂ）は、その内輪の断面図であり、（ｃ）は、その保持器の断面図であり、（ｄ）は、その外輪の断面図である。 (Embodiment)
FIG. 1 (a) is a cross-sectional view of a rolling bearing according to an embodiment of the present invention, (b) is a cross-sectional view of its inner ring, and (c) is a cross-sectional view of its cage, (D) is a sectional view of the outer ring.

図２（ａ）は、本発明の実施の形態に係る転がり軸受の一部破断の斜視図であり、（ｂ）は、その内輪の一部破断の斜視図であり、（ｃ）は、その保持器の一部破断の斜視図であり、（ｄ）は、その外輪の一部破断の斜視図である。   FIG. 2A is a partially broken perspective view of the rolling bearing according to the embodiment of the present invention, FIG. 2B is a partially broken perspective view of its inner ring, and FIG. It is a partially broken perspective view of a cage, and (d) is a partially broken perspective view of the outer ring.

本実施の形態では、内輪１と、外輪２との間に、玉３と円筒ころ４との二種類の転動体が転動自在に介装してある。玉３と円筒ころ４とは、周方向に交互に配列してある。   In the present embodiment, two types of rolling elements of a ball 3 and a cylindrical roller 4 are interposed between the inner ring 1 and the outer ring 2 so as to be freely rollable. The balls 3 and the cylindrical rollers 4 are alternately arranged in the circumferential direction.

内輪１は、軸受の組み立て性から、２つ割れに設定してあり、その外径側の中央部には、凹溝加工面５が設けてあり、この凹溝加工面５は、玉３の軌道レース面となる。また、その両側の外径面６，６は、円筒ころ４の軌道レース面となる。   The inner ring 1 is divided into two parts because of the ease of assembly of the bearing, and a grooved surface 5 is provided at the center on the outer diameter side. It becomes an orbital race surface. Further, the outer diameter surfaces 6 and 6 on both sides serve as raceway race surfaces of the cylindrical rollers 4.

外輪２は、その内径側の中央部には、凹溝加工面７が設けてあり、この凹溝加工面７は、玉３の軌道レース面となる。また、その両側の内径面８，８は、円筒ころ４の軌道レース面となる。   The outer ring 2 is provided with a concave groove machining surface 7 in the central portion on the inner diameter side, and the concave groove machining surface 7 becomes a raceway race surface of the ball 3. Further, the inner diameter surfaces 8 and 8 on both sides serve as raceway race surfaces of the cylindrical rollers 4.

保持器１０は、一つの保持器自体に、玉３と円筒ころ４の二種類のポケット１１，１２を備えている。   The cage 10 includes two types of pockets 11 and 12, which are a ball 3 and a cylindrical roller 4, in one cage itself.

このような構成により、負荷荷重は、ラジアル荷重を主に円筒ころ４で受け、アキシアル荷重は、主に玉３で受けるようになっている。   With such a configuration, the load load is received mainly by the cylindrical rollers 4 and the axial load is received mainly by the balls 3.

このように、本実施の形態によれば、一つの保持器１０に、玉３と円筒ころ４の二種類のポケット１１，１２を設けて、転動体を保持することから、組み込みスペース、組み立て工数を増やすことなく、深みぞ玉軸受と円筒ころ軸受の機能を１つの軸受に集約することができる。そのため、組み込みスペースと組み立て性の面で有利である。   As described above, according to the present embodiment, two types of pockets 11 and 12 of the ball 3 and the cylindrical roller 4 are provided in one cage 10 to hold the rolling elements. The functions of the deep groove ball bearing and the cylindrical roller bearing can be integrated into one bearing without increasing the number of bearings. Therefore, it is advantageous in terms of installation space and assembly.

また、一つの保持器１０のポケット１１，１２に、玉３と円筒ころ４を組み込み、一体型となっているため、軸受構成部品を少なくすることができると同時に、組合せ軸受では、必要な差幅管理と加工を省略できる。さらに、軸受のコストダウンに効果がある。すなわち、部品点数を少なくすることで、部品コストの低減を図ることができ、製造工程が少なくなり、生産性の向上を図ることができる。   Further, since the ball 3 and the cylindrical roller 4 are incorporated into the pockets 11 and 12 of one cage 10 and are integrated, the bearing components can be reduced, and at the same time, the combination bearing requires a difference. Width management and processing can be omitted. Furthermore, it is effective in reducing the cost of the bearing. That is, by reducing the number of parts, the part cost can be reduced, the number of manufacturing steps can be reduced, and the productivity can be improved.

（変形例）
図３（ａ）は、本発明の実施の形態の第１変形例に係る転がり軸受の断面図であり、（ｂ）は、本発明の実施の形態の第２変形例に係る転がり軸受の断面図であり、（ｃ）は、本発明の実施の形態の第３変形例に係る転がり軸受の断面図である。 (Modification)
FIG. 3A is a cross-sectional view of a rolling bearing according to a first modification of the embodiment of the present invention, and FIG. 3B is a cross-section of a rolling bearing according to the second modification of the embodiment of the present invention. It is a figure and (c) is sectional drawing of the rolling bearing which concerns on the 3rd modification of embodiment of this invention.

図３（ａ）の第１変形例では、玉３と円筒ころ４とは、周方向に交互に配列してあると共に、外輪２は、軸受の組み立て性から、２つ割れに設定してある。なお、外輪２は、その中央で、２つ割れに設定してある。その他の構成、作用、及び効果は、上述した実施の形態と同様である。   In the 1st modification of Fig.3 (a), while the ball | bowl 3 and the cylindrical roller 4 are alternately arranged in the circumferential direction, the outer ring | wheel 2 is set to the 2nd from the assembly property of the bearing. . The outer ring 2 is set to be broken into two at the center. Other configurations, operations, and effects are the same as those in the above-described embodiment.

図３（ｂ）の第２変形例では、玉３と円筒ころ４とは、軸方向に並列に配列してあり、玉３と円筒ころ４の二種類のポケット１１，１２を備えた一つの保持器１０により保持してある。   In the second modification of FIG. 3B, the balls 3 and the cylindrical rollers 4 are arranged in parallel in the axial direction, and are provided with two kinds of pockets 11 and 12 of the balls 3 and the cylindrical rollers 4. It is held by the cage 10.

また、内輪１は、軸受の組み立て性から、２つ割れに設定してある。なお、内輪１は、小幅と大幅との２つ割れに設定してある。その他の構成、作用、及び効果は、上述した実施の形態と同様である。   Further, the inner ring 1 is set to be broken into two because of the ease of assembly of the bearing. The inner ring 1 is set to be divided into two parts, a small width and a large width. Other configurations, operations, and effects are the same as those in the above-described embodiment.

図３（ｃ）の第３変形例では、玉３と円筒ころ４とは、軸方向に並列に配列してあり、玉３と円筒ころ４の二種類のポケット１１，１２を備えた一つの保持器１０により保持してある。   In the third modification of FIG. 3C, the balls 3 and the cylindrical rollers 4 are arranged in parallel in the axial direction, and one ball having two kinds of pockets 11 and 12 of the balls 3 and the cylindrical rollers 4 is provided. It is held by the cage 10.

また、外輪２は、軸受の組み立て性から、２つ割れに設定してある。なお、外輪２は、小幅と大幅との２つ割れに設定してある。その他の構成、作用、及び効果は、上述した実施の形態と同様である。   Moreover, the outer ring | wheel 2 is set to the two cracks from the assembly property of the bearing. In addition, the outer ring | wheel 2 is set to the two cracks of the small width and the large. Other configurations, operations, and effects are the same as those in the above-described embodiment.

なお、本発明は、上述した実施の形態に限定されず、種々変形可能である。   In addition, this invention is not limited to embodiment mentioned above, A various deformation | transformation is possible.

（ａ）は、本発明の実施の形態に係る転がり軸受の断面図であり、（ｂ）は、その内輪の断面図であり、（ｃ）は、その保持器の断面図であり、（ｄ）は、その外輪の断面図である。(A) is sectional drawing of the rolling bearing which concerns on embodiment of this invention, (b) is sectional drawing of the inner ring | wheel, (c) is sectional drawing of the cage | basket, (d ) Is a cross-sectional view of the outer ring. （ａ）は、本発明の実施の形態に係る転がり軸受の一部破断の斜視図であり、（ｂ）は、その内輪の一部破断の斜視図であり、（ｃ）は、その保持器の一部破断の斜視図であり、（ｄ）は、その外輪の一部破断の斜視図である。(A) is a partially broken perspective view of the rolling bearing according to the embodiment of the present invention, (b) is a partially broken perspective view of the inner ring, (c) is a cage thereof FIG. 4D is a partially broken perspective view of the outer ring. FIG. （ａ）は、本発明の実施の形態の第１変形例に係る転がり軸受の断面図であり、（ｂ）は、本発明の実施の形態の第２変形例に係る転がり軸受の断面図であり、（ｃ）は、本発明の実施の形態の第３変形例に係る転がり軸受の断面図である。(A) is sectional drawing of the rolling bearing which concerns on the 1st modification of embodiment of this invention, (b) is sectional drawing of the rolling bearing which concerns on the 2nd modification of embodiment of this invention. FIG. 8C is a cross-sectional view of a rolling bearing according to a third modification of the embodiment of the present invention. （ａ）は、従来例に係り、深みぞ玉軸受と円筒ころ軸受を組合せて使用する転がり軸受の一部破断の斜視図であり、（ｂ）は、その断面図である。(A) is a perspective view of a partially broken rolling bearing using a combination of a deep groove ball bearing and a cylindrical roller bearing according to a conventional example, and (b) is a sectional view thereof.

符号の説明Explanation of symbols

１ 内輪
２ 外輪
３ 玉
４ 円筒ころ
５ 凹溝加工面
６ 外径面
７ 凹溝加工面
８ 内径面
１０ 保持器
１１，１２ ポケット
２０ 深みぞ玉軸受
２１ 内輪
２２ 外輪
２３ 玉
２４ 保持器
３０ 円筒ころ軸受
３１ 内輪
３２ 外輪
３３ 円筒ころ
３４ 保持器 DESCRIPTION OF SYMBOLS 1 Inner ring 2 Outer ring 3 Ball 4 Cylindrical roller 5 Concave groove processing surface 6 Outer diameter surface 7 Concave groove processing surface 8 Inner diameter surface 10 Cage 11, 12 Pocket 20 Deep groove ball bearing 21 Inner ring 22 Outer ring 23 Ball 24 Cage 30 Cylindrical roller Bearing 31 Inner ring 32 Outer ring 33 Cylindrical roller 34 Cage

Claims (5)

内輪と、外輪との間に、玉と円筒ころとの二種類の転動体を転動自在に介装した転がり軸受に於いて、
一つの保持器に、玉と円筒ころの二種類のポケットを設けて、転動体を保持することを特徴とする転がり軸受。 In a rolling bearing in which two types of rolling elements of a ball and a cylindrical roller are interposed between an inner ring and an outer ring so as to freely roll,
A rolling bearing characterized in that two types of pockets of balls and cylindrical rollers are provided in one cage to hold a rolling element. 円筒ころの転動体は、外輪の内径面と内輪の外径面を、軌道レ−ス面として使用することを特徴とする請求項１に記載の転がり軸受。   2. The rolling bearing according to claim 1, wherein the rolling element of the cylindrical roller uses an inner diameter surface of the outer ring and an outer diameter surface of the inner ring as raceway race surfaces. 玉の転動体は、外輪の凹溝加工面と内輪の凹溝加工面を、軌道レース面として使用することを特徴とする請求項１に記載の転がり軸受。   The rolling bearing according to claim 1, wherein the ball rolling element uses a grooved surface of the outer ring and a grooved surface of the inner ring as raceway race surfaces. 負荷荷重は、ラジアル荷重を円筒ころで受け、アキシアル荷重は、玉で受けることを特徴とする請求項１に記載の転がり軸受。   The rolling bearing according to claim 1, wherein the load load is a radial load received by a cylindrical roller, and the axial load is received by a ball. 外輪もしくは内輪の一方は、２つ割れに設定してあることを特徴とする請求項１に記載の転がり軸受。   The rolling bearing according to claim 1, wherein one of the outer ring and the inner ring is set to be broken into two.
JP2004336052A 2004-11-19 2004-11-19 Rolling bearing Withdrawn JP2006144921A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006044802A1 (en) * 2006-09-22 2008-03-27 Schaeffler Kg Combined sliding ball bearing for supporting shaft in gear construction, has balls and rollers unroll on remaining shoulder surfaces, where bearing is formed as four-point ball bearing, so that running grooves have contact points
CN100494712C (en) * 2006-11-10 2009-06-03 中机洛阳轴承科技有限公司 Metal solid holding frame for angle contact ball bearing
WO2011055630A1 (en) * 2009-11-04 2011-05-12 株式会社ジェイテクト Camshaft apparatus
CN102562794A (en) * 2012-02-23 2012-07-11 威海利奥泰儆自动化设备有限公司 Wire raceway bearing and manufacturing method thereof
CN103388626A (en) * 2012-05-13 2013-11-13 芜湖市宝艺游乐科技设备有限公司 Outer-ring-separable deep groove ball bearing
CN104019123A (en) * 2014-05-04 2014-09-03 洛阳百思特精密机械制造有限公司 Multi-row cylindrical roller thrust bearing
CN106286605A (en) * 2015-05-28 2017-01-04 江苏万达特种轴承有限公司 The roller of double inner wrap strip retainers

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006044802A1 (en) * 2006-09-22 2008-03-27 Schaeffler Kg Combined sliding ball bearing for supporting shaft in gear construction, has balls and rollers unroll on remaining shoulder surfaces, where bearing is formed as four-point ball bearing, so that running grooves have contact points
CN100494712C (en) * 2006-11-10 2009-06-03 中机洛阳轴承科技有限公司 Metal solid holding frame for angle contact ball bearing
WO2011055630A1 (en) * 2009-11-04 2011-05-12 株式会社ジェイテクト Camshaft apparatus
JP2011099342A (en) * 2009-11-04 2011-05-19 Jtekt Corp Camshaft device
CN102562794A (en) * 2012-02-23 2012-07-11 威海利奥泰儆自动化设备有限公司 Wire raceway bearing and manufacturing method thereof
CN103388626A (en) * 2012-05-13 2013-11-13 芜湖市宝艺游乐科技设备有限公司 Outer-ring-separable deep groove ball bearing
CN104019123A (en) * 2014-05-04 2014-09-03 洛阳百思特精密机械制造有限公司 Multi-row cylindrical roller thrust bearing
CN106286605A (en) * 2015-05-28 2017-01-04 江苏万达特种轴承有限公司 The roller of double inner wrap strip retainers

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