JP2012122513A - Needle roller bearing with retainer - Google Patents

Needle roller bearing with retainer Download PDF

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Publication number
JP2012122513A
JP2012122513A JP2010272146A JP2010272146A JP2012122513A JP 2012122513 A JP2012122513 A JP 2012122513A JP 2010272146 A JP2010272146 A JP 2010272146A JP 2010272146 A JP2010272146 A JP 2010272146A JP 2012122513 A JP2012122513 A JP 2012122513A
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Japan
Prior art keywords
needle roller
cage
roller bearing
shell member
needle
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JP2010272146A
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JP5749924B2 (en
Inventor
Shuichi Kajikawa
修一 梶川
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NTN Corp
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NTN Corp
NTN Toyo Bearing Co 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
    • 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
    • F16C33/4617—Massive or moulded cages having cage pockets surrounding the rollers, e.g. machined window cages
    • F16C33/4623—Massive or moulded cages having cage pockets surrounding the rollers, e.g. machined window cages formed as one-piece cages, i.e. monoblock cages
    • F16C33/4635—Massive or moulded cages having cage pockets surrounding the rollers, e.g. machined window cages formed as one-piece cages, i.e. monoblock cages made from plastic, e.g. injection moulded window cages
    • 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
    • F16C33/58—Raceways; Race rings
    • F16C33/588—Races of sheet metal
    • 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
    • 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
    • F16C2361/00—Apparatus or articles in engineering in general
    • F16C2361/61—Toothed gear systems, e.g. support of pinion shafts

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

Abstract

PROBLEM TO BE SOLVED: To provide a needle roller bearing with a retainer the life of which is not affected by surface roughness of a counterpart member on which the needle roller bearing with a retainer is mounted and which can be mounted cost-effectively on the inner diameter surface of the counterpart member.SOLUTION: A shell member 12, which has a truck surface 12a for needle rollers 11 on inner circumferential surface and a pair of inward flanges 12b at both ends, is integrated on the outer peripheral surface of arrangement of needle rollers 11. Both end outside surfaces of the shell member 12 do not project in the width direction from both end outside surfaces of the retainer 10 and a pair of the inward flanges 12b are set to length that does not reach the width surface of the retainer 10. A gear 16 and washer 17 are provided without contacting a pair of the inward flanges 12b of the shell member 12.

Description

この発明は、保持器付き針状ころ軸受に関するものである。   The present invention relates to a needle roller bearing with a cage.

保持器付き針状ころ軸受は、図６に示すように、針状ころ１を保持器２に分離しないように組み付けたものであり、内輪外径と外輪内径との差が小さいスペースにも収めることができるので、遊星歯車機構の遊星歯車を回転自在に支持する際に使用することができる。   The needle roller bearing with cage is assembled so that the needle roller 1 is not separated into the cage 2 as shown in FIG. 6, and fits in a space where the difference between the inner ring outer diameter and the outer ring inner diameter is small. Therefore, it can be used when the planetary gear of the planetary gear mechanism is rotatably supported.

このような用途に使用される保持器付き針状ころ軸受は、遊星歯車のギア３の内径面が直接、針状ころ１の軌道面３ａになっている（特許文献１）。   In the needle roller bearing with a cage used for such applications, the inner diameter surface of the gear 3 of the planetary gear is directly the raceway surface 3a of the needle roller 1 (Patent Document 1).

特開２００５−２１４３９１号公報JP-A-2005-214391

ところで、近年は、保持器付き針状ころ軸受を使用するユーザーの中には、原価低減のために、針状ころ１の軌道面３ａとなるギア３の内径面を超硬旋削によって仕上げるだけで、研磨仕上げを行っていない場合も多い。   By the way, in recent years, some users who use needle roller bearings with cages simply finish the inner diameter surface of the gear 3 that becomes the raceway surface 3a of the needle roller 1 by carbide turning in order to reduce the cost. In many cases, the polishing finish is not performed.

このような場合、針状ころ１の軌道面３ａとなるギア３の内径面の面粗さが大きく、保持器付き針状ころ軸受の寿命が短寿命化するという問題が生じる。   In such a case, there is a problem that the surface roughness of the inner diameter surface of the gear 3 that becomes the raceway surface 3a of the needle roller 1 is large, and the life of the needle roller bearing with a cage is shortened.

そこで、この発明は、保持器付き針状ころ軸受を取付けるギアの内径面等の相手部材の内径面の面粗さによって寿命が左右されることなく、しかも相手部材の内径面に簡単に取り付けることができる、保持器付き針状ころ軸受を提供するものである。   Therefore, the present invention can be easily attached to the inner diameter surface of the mating member without being affected by the roughness of the inner diameter surface of the mating member such as the inner diameter surface of the gear to which the needle roller bearing with cage is mounted. The present invention provides a needle roller bearing with a cage.

前記の課題を解決するために、この発明は、針状ころを保持器に分離しないように組み付けた保持器付きの針状ころ軸受において、内周面に前記針状ころの軌道面を有し、両端部に一対の内向きフランジを有するシェル部材を、針状ころ配列の外周面に一体化し、シェル部材の両端外側面が、保持器の両端外側面よりも幅方向に突出せず、かつ、一対のフランジが、保持器の幅面に達しない長さに設定したものである。   In order to solve the above-mentioned problems, the present invention provides a needle roller bearing with a cage assembled so as not to separate the needle roller into a cage, and has a raceway surface of the needle roller on an inner peripheral surface. A shell member having a pair of inward flanges at both ends is integrated with the outer peripheral surface of the needle roller array, and the outer end surfaces of the shell member do not protrude in the width direction from the outer end surfaces of the cage, and The length of the pair of flanges does not reach the width of the cage.

針状ころの端面は、前記シェル部材の一対のフランジに接触しないようにしている。したがって、前記保持器は、転動体案内となる。   The end face of the needle roller is made not to contact the pair of flanges of the shell member. Therefore, the cage serves as a rolling element guide.

シェル部材は、鋼板のプレス成形品又は削り加工品によって形成することができる。   The shell member can be formed by a press-formed product or a machined product of a steel plate.

保持器の針状ころを収容するポケットの対向面には、ピッチ円径ＰＣＤよりも小径位置に内径側抜け止め部、ピッチ円径ＰＣＤよりも大径位置に外径側抜け止め部をそれぞれ設け、内径側抜け止め部と外径側抜け止め部との間に、針状ころを収容した状態で、針状ころを内径側に移動可能にする遊隙を設けることが好ましい。   On the opposing surface of the pocket that accommodates the needle rollers of the cage, an inner diameter side retaining portion is provided at a position smaller than the pitch circle diameter PCD, and an outer diameter side retaining portion is disposed at a position larger than the pitch circle diameter PCD. Preferably, a clearance is provided between the inner diameter side retaining portion and the outer diameter side retaining portion so that the needle roller can be moved to the inner diameter side while the needle roller is accommodated.

この発明の保持器付きの針状ころ軸受は、遊星歯車の内径面に装着して使用される。   The needle roller bearing with a cage according to the present invention is used by being mounted on the inner diameter surface of the planetary gear.

この発明の保持器付きの針状ころ軸受は、針状ころがシェル部材の内径面の軌道面に案内されるため、針状ころ軸受を取付けるギアの内径面等の相手部材の内径面の面粗さによって寿命が左右されることがない。また、相手部材の内径面に嵌め入れることによって、簡単かつ安価に取り付けることができる。   In the needle roller bearing with a cage according to the present invention, since the needle roller is guided to the raceway surface of the inner surface of the shell member, the inner surface of the mating member such as the inner surface of the gear to which the needle roller bearing is mounted. Life is not affected by roughness. Moreover, it can be attached easily and inexpensively by fitting into the inner diameter surface of the mating member.

この発明に係る保持器付きの針状ころ軸受の断面図である。It is a sectional view of a needle roller bearing with a cage concerning this invention. 図１の保持器のポケットを側面から見た部分拡大図である。It is the elements on larger scale which looked at the pocket of the holder of Drawing 1 from the side. シェル部材の組み込み状態を示す断面図である。It is sectional drawing which shows the incorporating state of a shell member. この発明に係る保持器付きの針状ころ軸受を遊星歯車のギア内径面に装着した状態を示す断面図である。It is sectional drawing which shows the state which mounted | wore the gear roller inner surface of the planetary gear with the needle roller bearing with a holder concerning this invention. 比較例の保持器付きの針状ころ軸受の断面図である。It is sectional drawing of the needle roller bearing with a holder | retainer of a comparative example. 従来の保持器付きの針状ころを軸受遊星歯車のギア内径面に装着した状態を示す断面図である。It is sectional drawing which shows the state which mounted | worn the conventional needle roller with a holder | retainer on the gear internal diameter surface of a bearing planetary gear.

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。
この発明に係る保持器付き針状ころは、図１に示すように、保持器１０と、針状ころ１１と、針状ころ１１の配列の外周面に一体化されるシェル部材１２とからなる。 Embodiments of the present invention will be described below with reference to the accompanying drawings.
As shown in FIG. 1, the needle roller with a cage according to the present invention includes a cage 10, a needle roller 11, and a shell member 12 that is integrated with an outer peripheral surface of the array of needle rollers 11. .

保持器１０には、針状ころ１１を並列状態で収容するポケット１３が等間隔で複数配置されている。   In the cage 10, a plurality of pockets 13 for accommodating the needle rollers 11 in a parallel state are arranged at equal intervals.

ポケット１３の円周方向の対向壁面には、図２に示すように、ポケット１３に収容する針状ころ１１のピッチ円径ＰＣＤよりも小径位置に内径側抜け止め部１４、ピッチ円径ＰＣＤよりも大径位置に外径側抜け止め部１５がそれぞれ設けられている。   As shown in FIG. 2, the inner circumferential side retaining portion 14 and the pitch circle diameter PCD are disposed on the opposite wall surfaces in the circumferential direction of the pocket 13 at a position smaller than the pitch circle diameter PCD of the needle rollers 11 accommodated in the pocket 13. The outer diameter side retaining portions 15 are respectively provided at the large diameter positions.

内径側抜け止め部１４と外径側抜け止め部１５との間には、針状ころ１１を収容した状態で、図３に鎖線で示すように、針状ころ１１を内径側に移動可能にする遊隙ｄが設けられている。   The needle roller 11 is movable between the inner diameter side retaining portion 14 and the outer diameter side retaining portion 15 in a state in which the needle roller 11 is accommodated, as indicated by a chain line in FIG. A play d is provided.

シェル部材１２は、鋼板のプレス成形品又は削り加工品からなり、内周面に前記針状ころ１１の軌道面１２ａを有し、両端部に一対の内向きフランジ１２ｂを有する。   The shell member 12 is made of a press-formed product or a machined product of a steel plate, has a raceway surface 12a of the needle roller 11 on the inner peripheral surface, and has a pair of inward flanges 12b on both ends.

シェル部材１２を針状ころ１１の配列の外周面に組み付けて一体化するには、内径側抜け止め部１４と外径側抜け止め部１５との間の前記遊隙ｄを利用し、図３に示すように、針状ころ１１を内径側に寄せて針状ころ１１の配列をシェル部材１２の内径側に簡単に挿入できるようにしている。   In order to assemble and integrate the shell member 12 on the outer peripheral surface of the needle roller 11 array, the clearance d between the inner diameter side retaining portion 14 and the outer diameter side retaining portion 15 is utilized, and FIG. As shown, the needle rollers 11 are moved closer to the inner diameter side so that the arrangement of the needle rollers 11 can be easily inserted into the inner diameter side of the shell member 12.

前記シェル部材１２は、幅方向の長さが保持器１０の長さと同一に形成され、シェル部材１２の両端外側面が、保持器１０の両端外側面よりも幅方向に突出しないようにしている。また、シェル部材１２の一対のフランジ１２ｂは、シェル部材１２の内径側に針状ころ１１を組み込んだ状態で、保持器１０の幅面に達しない長さに設定され、保持器１０が転動体案内になっている。   The shell member 12 is formed so that the length in the width direction is the same as the length of the cage 10, and the outer end surfaces of the shell member 12 are prevented from projecting in the width direction from the outer end surfaces of the cage 10. . Further, the pair of flanges 12b of the shell member 12 is set to a length that does not reach the width surface of the cage 10 in a state where the needle rollers 11 are incorporated on the inner diameter side of the shell member 12, and the cage 10 guides the rolling elements. It has become.

シェル部材１２の一対のフランジ１２ｂの長さを、比較例として示す図５に示すように、保持器１０の幅面に達する長さに設定した場合、シェル部材１２の一対のフランジ１２ｂが、保持器１０の幅面を覆うため、保持器１０の幅寸法が小さくなる。それに伴って針状ころ１１の長さも短くなり、その結果、比較例の負荷容量が低下し、高負荷容量が要求される用途には使用できない。
これに対し、この発明に係る保持器付き針状ころは、前記のように、シェル部材１２の一対のフランジ１２ｂは、シェル部材１２の内径側に針状ころ１１を組み込んだ状態で、保持器１０の幅面に達しない長さに設定しているため、図４に示すように、例えば、遊星歯車のギア１６の内径面に圧入して組み込んだ場合、保持器１０は、ギア１６の幅面のワッシャ１７によって案内される。このため、機能上の問題がなく、針状ころ１１は、シェル部材１２の軌道面１２ａによって案内されるため、ギア１６の内径面の面粗さが粗い場合でも、針状ころ１１の寿命の低下を防止できる。 When the length of the pair of flanges 12b of the shell member 12 is set to a length that reaches the width surface of the cage 10 as shown in FIG. 5 shown as a comparative example, the pair of flanges 12b of the shell member 12 is Since the width surface of 10 is covered, the width dimension of the cage 10 is reduced. Accordingly, the length of the needle roller 11 is shortened. As a result, the load capacity of the comparative example is reduced, and the needle roller 11 cannot be used for applications requiring high load capacity.
On the other hand, in the needle roller with cage according to the present invention, as described above, the pair of flanges 12b of the shell member 12 has the needle roller 11 incorporated on the inner diameter side of the shell member 12 and the cage. Since the length is set so as not to reach the width surface of 10, as shown in FIG. 4, for example, when the cage 10 is press-fit into the inner diameter surface of the gear 16 of the planetary gear, Guided by washer 17. For this reason, there is no functional problem, and the needle roller 11 is guided by the raceway surface 12a of the shell member 12. Therefore, even if the surface roughness of the inner diameter surface of the gear 16 is rough, the life of the needle roller 11 is reduced. Decline can be prevented.

前記保持器１０の材質としては、金属又は樹脂によって形成することができる。   The cage 10 can be made of metal or resin.

樹脂製の保持器１０は、射出成形等により製造することが可能であるため、大量生産が容易となり、安価に製造することができる。樹脂としては、例えば、ナイロン６６やナイロン４６、ポリフェニレンスルフィド（ＰＰＳ）やポリエーテルエーテルケトン（ＰＥＥＫ）等が挙げられる。なお、必要に応じて、樹脂に炭素繊維やガラス繊維、カーボンブラック等を充填することにしてもよい。   Since the resin cage 10 can be manufactured by injection molding or the like, mass production becomes easy and can be manufactured at low cost. Examples of the resin include nylon 66, nylon 46, polyphenylene sulfide (PPS), polyether ether ketone (PEEK), and the like. If necessary, the resin may be filled with carbon fiber, glass fiber, carbon black, or the like.

以上、図面を参照してこの発明の実施形態を説明したが、この発明は、図示した実施形態のものに限定されない。図示した実施形態に対して、この発明と同一の範囲内において、あるいは均等の範囲内において、種々の修正や変形を加えることが可能である。   As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to the thing of embodiment shown in figure. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

この発明に係る保持器付き針状ころは、高負荷容量であるため、建設機械、減速機の遊星歯車に有効に利用される。   Since the needle roller with cage according to the present invention has a high load capacity, it is effectively used for a planetary gear of a construction machine and a reduction gear.

１０ 保持器
１１ 針状ころ
１２ シェル部材
１３ ポケット
１４ 内径側抜け止め部
１５ 外径側抜け止め部
１６ ギア
１７ ワッシャ DESCRIPTION OF SYMBOLS 10 Cage 11 Needle roller 12 Shell member 13 Pocket 14 Inner diameter side retaining part 15 Outer diameter side retaining part 16 Gear 17 Washer

Claims (7)

針状ころを保持器に分離しないように組み付けた保持器付きの針状ころ軸受において、内周面に前記針状ころの軌道面を有し、両端部に一対の内向きフランジを有するシェル部材を、針状ころ配列の外周面に一体化し、シェル部材は、その両端外側面が、保持器の両端外側面よりも幅方向に突出せず、かつ、一対のフランジが、保持器の幅面に達しない長さに設定されていることを特徴とする針状ころ軸受。   In a needle roller bearing with a cage assembled so as not to separate the needle roller into a cage, a shell member having a raceway surface of the needle roller on an inner peripheral surface and a pair of inward flanges on both ends The shell member is integrated with the outer peripheral surface of the needle roller array, and the shell member does not protrude in the width direction from the outer surface at both ends of the cage, and the pair of flanges at the width surface of the cage. Needle roller bearings characterized by being set to a length that does not reach. 針状ころの端面が、前記シェル部材の一対のフランジに接触しない請求項１記載の針状ころ軸受。   The needle roller bearing according to claim 1, wherein end faces of the needle rollers do not contact the pair of flanges of the shell member. シェル部材が鋼板のプレス成形品からなる請求項１又は２記載の針状ころ軸受。   The needle roller bearing according to claim 1 or 2, wherein the shell member is a press-formed product of a steel plate. シェル部材が削り加工品からなる請求項１〜３のいずれかに記載の針状ころ軸受。   The needle roller bearing according to any one of claims 1 to 3, wherein the shell member is a machined product. 保持器の針状ころを収容するポケットの対向面に、ピッチ円径ＰＣＤよりも小径位置に内径側抜け止め部、ピッチ円径ＰＣＤよりも大径位置に外径側抜け止め部をそれぞれ設け、内径側抜け止め部と外径側抜け止め部との間に、針状ころを収容した状態で、針状ころを内径側に移動可能にする遊隙を設けている請求項１〜４のいずれかに記載の針状ころ軸受。   On the opposing surface of the pocket that accommodates the needle rollers of the cage, an inner diameter side retaining portion is provided at a smaller diameter position than the pitch circle diameter PCD, and an outer diameter side retaining portion is disposed at a larger diameter position than the pitch circle diameter PCD, 5. A clearance is provided between the inner diameter side retaining portion and the outer diameter side retaining portion so as to allow the needle rollers to move toward the inner diameter side in a state in which the needle rollers are accommodated. Needle roller bearing according to the above. 前記保持器が転動体案内である請求項１〜５のいずれかに記載の針状ころ軸受。   The needle roller bearing according to any one of claims 1 to 5, wherein the cage is a rolling element guide. 前記遊星歯車の内径面に装着される請求項１〜６のいずれかに記載の針状ころ軸受。
The needle roller bearing according to any one of claims 1 to 6, which is mounted on an inner diameter surface of the planetary gear.
JP2010272146A 2010-12-07 2010-12-07 Needle roller bearing with cage Expired - Fee Related JP5749924B2 (en)

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DE102012215739A1 (en) * 2012-09-05 2014-03-06 Schaeffler Technologies AG & Co. KG Radial needle ring for bearing mass balance shaft reducing free mass force of reciprocating piston engine, has cross webs formed with extensions, which are provided as supports of needle ring on outer casing surface or bearing inner ring
JP2015534022A (en) * 2012-11-07 2015-11-26 シェフラー テクノロジーズ アー・ゲー ウント コー． カー・ゲーＳｃｈａｅｆｆｌｅｒ Ｔｅｃｈｎｏｌｏｇｉｅｓ ＡＧ ＆ Ｃｏ． ＫＧ Race ring for shell type bearing
US10605303B2 (en) 2016-11-14 2020-03-31 Nsk Ltd. Cylindrical roller bearing
CN115143922A (en) * 2022-06-19 2022-10-04 北京工业大学 Gear tooth surface roughness measurement and evaluation method for transmission performance analysis

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JP2006138376A (en) * 2004-11-11 2006-06-01 Ntn Corp Radial needle roller bearing
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JP2004084707A (en) * 2002-08-23 2004-03-18 Koyo Seiko Co Ltd Roller bearing
JP2004278643A (en) * 2003-03-14 2004-10-07 Nsk Ltd Crank unit for plunger pump
JP2005180636A (en) * 2003-12-22 2005-07-07 Nsk Ltd Bearing for planetary gear
JP2005214391A (en) * 2004-02-02 2005-08-11 Nsk Ltd Needle bearing and planetary gear mechanism
JP2006138376A (en) * 2004-11-11 2006-06-01 Ntn Corp Radial needle roller bearing
JP2009030468A (en) * 2007-07-25 2009-02-12 Jtekt Corp Camshaft unit
JP2010014179A (en) * 2008-07-02 2010-01-21 Ntn Corp Cam-follower for rocker arm and cam-follower device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012215739A1 (en) * 2012-09-05 2014-03-06 Schaeffler Technologies AG & Co. KG Radial needle ring for bearing mass balance shaft reducing free mass force of reciprocating piston engine, has cross webs formed with extensions, which are provided as supports of needle ring on outer casing surface or bearing inner ring
JP2015534022A (en) * 2012-11-07 2015-11-26 シェフラー テクノロジーズ アー・ゲー ウント コー． カー・ゲーＳｃｈａｅｆｆｌｅｒ Ｔｅｃｈｎｏｌｏｇｉｅｓ ＡＧ ＆ Ｃｏ． ＫＧ Race ring for shell type bearing
US10605303B2 (en) 2016-11-14 2020-03-31 Nsk Ltd. Cylindrical roller bearing
CN115143922A (en) * 2022-06-19 2022-10-04 北京工业大学 Gear tooth surface roughness measurement and evaluation method for transmission performance analysis
CN115143922B (en) * 2022-06-19 2023-09-26 北京工业大学 Gear tooth surface roughness measurement and evaluation method for transmission performance analysis

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