JP2017172649A - Rolling bearing - Google Patents

Rolling bearing Download PDF

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JP2017172649A
JP2017172649A JP2016057824A JP2016057824A JP2017172649A JP 2017172649 A JP2017172649 A JP 2017172649A JP 2016057824 A JP2016057824 A JP 2016057824A JP 2016057824 A JP2016057824 A JP 2016057824A JP 2017172649 A JP2017172649 A JP 2017172649A
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Prior art keywords
rolling
raceway surface
bearing
inner ring
outer ring
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孟 壇
Takeshi Dan
孟 壇
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NTN Corp
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NTN Corp
NTN Toyo Bearing Co Ltd
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Priority to JP2016057824A priority Critical patent/JP2017172649A/en
Priority to PCT/JP2017/009961 priority patent/WO2017163976A1/en
Publication of JP2017172649A publication Critical patent/JP2017172649A/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
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • F16C19/16—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with a single row of balls
    • 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
    • F16C33/38—Ball cages
    • F16C33/44—Selection of substances
    • 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
    • F16C33/66—Special parts or details in view of lubrication

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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 rolling bearing 1 performing oscillation movement at an oscillation angle θ, which is configured to properly transfer a solid lubricant from a holder 7 to a raceway surface 4 of an inner ring 2 and a raceway surface 5 of an outer ring 3 through a rolling body 6 to prevent occurrence of lubrication failure.SOLUTION: A bearing specification for transferring a solid lubricant from a holder 7 to a raceway surface 4 of an inner ring 2 and a raceway surface 5 of an outer ring 3 through a rolling body 6, is derived from a relational expression between a rolling body pitch circle diameter dp and a rolling body diameter dw.SELECTED DRAWING: Figure 1

Description

この発明は、固体潤滑方式の転がり軸受に関し、特に、揺動運動を行なう装置に好適に使用される転がり軸受に関する。   The present invention relates to a solid lubrication type rolling bearing, and more particularly to a rolling bearing suitably used for an apparatus that performs a swinging motion.

内輪の外周面と外輪の内周面とにそれぞれ形成された軌道面の間に、玉やころなどの転動体を組み込み、各転動体相互の間の間隔を保つ保持器を備えた転がり軸受の潤滑方式は、軸受の用途や目的に応じて適宜好適なものが採用されている。例えば、宇宙空間など極低温真空環境での使用を目的とする場合には、固体潤滑方式が採用されることが多い（特許文献１）。   Rolling bearings equipped with rolling elements, such as balls and rollers, between the raceways formed on the outer peripheral surface of the inner ring and the inner peripheral surface of the outer ring, respectively, and with a cage that keeps the spacing between the rolling elements. As the lubrication method, a suitable one is appropriately employed according to the application and purpose of the bearing. For example, when intended for use in a cryogenic vacuum environment such as outer space, a solid lubrication method is often employed (Patent Document 1).

固体潤滑方式の転がり軸受は、例えば、潤滑剤を供給する機能を有した保持器から転動体を介して潤滑剤を内・外輪軌道面に供給する構成を採用する。   A solid lubrication type rolling bearing employs a configuration in which, for example, a lubricant is supplied to inner and outer ring raceway surfaces via a rolling element from a cage having a function of supplying the lubricant.

特開平２−２０８５４号公報JP-A-2-20854

ところで、宇宙空間で使用されるアンテナ支持部用等の軸受では、固体潤滑方式のもとで揺動運動を伴いながら高回転精度での運転が求められるため、高剛性化を目的に予圧を負荷した状態で使用される。そのような軸受の場合、固体潤滑剤の破断を防ぐため、転動体と軌道面間での接触面圧の低減や軸受の負荷容量の向上を目的として、可能な限り転動体径を大きくすることが望ましい。   By the way, bearings for antenna support parts used in outer space are required to be operated with high rotational accuracy while being accompanied by oscillating motion under the solid lubrication method, so a preload is applied to increase the rigidity. Used in the state In such a bearing, in order to prevent breakage of the solid lubricant, the diameter of the rolling element should be increased as much as possible for the purpose of reducing the contact surface pressure between the rolling element and the raceway surface and improving the load capacity of the bearing. Is desirable.

しかしながら、固体潤滑剤を供給する機能を有した保持器から転動体を介して固体潤滑剤を内・外輪軌道面に移着させる潤滑方式で揺動運動をする転がり軸受の場合、転動体ピッチ円径(dp)に対して転動体径(dw)が大きすぎると、内・外輪軌道面への固体潤滑剤の移着が適切に行われず、潤滑不良が発生する。   However, in the case of a rolling bearing that oscillates by a lubrication method in which the solid lubricant is transferred from the cage having the function of supplying the solid lubricant to the inner and outer raceway surfaces via the rolling elements, the rolling element pitch circle If the rolling element diameter (dw) is too large with respect to the diameter (dp), the solid lubricant is not properly transferred to the inner and outer ring raceway surfaces, resulting in poor lubrication.

すなわち、図３に示すように、揺動角θで揺動運動を行う転がり軸受１の場合、保持器７から転動体６を介して固体潤滑剤を内輪２の軌道面４と外輪３の軌道面５に移着させるためには、図４(ａ)に示すように、転動体６は少なくとも180°（1/2回転）以上自転する必要がある。ここで、図４(ｂ)に示すように、転動体ピッチ円径(dp)に対して転動体径(dw)が大きすぎると、転動体は180°（1/2回転）以上自転することができず、保持器７から転動体６を介して固体潤滑剤を内輪２の軌道面４と外輪３の軌道面５に移着させることができない。   That is, as shown in FIG. 3, in the case of the rolling bearing 1 that swings at the swing angle θ, the solid lubricant is passed from the cage 7 through the rolling elements 6 to the track surface 4 of the inner ring 2 and the track of the outer ring 3. In order to transfer to the surface 5, as shown to Fig.4 (a), the rolling element 6 needs to autorotate at least 180 degrees (1/2 rotation) or more. Here, as shown in FIG. 4 (b), if the rolling element diameter (dw) is too large with respect to the rolling element pitch circle diameter (dp), the rolling element rotates by 180 ° (1/2 rotation) or more. The solid lubricant cannot be transferred from the cage 7 to the raceway surface 4 of the inner ring 2 and the raceway surface 5 of the outer ring 3 through the rolling elements 6.

そこで、この発明は、揺動角θで揺動運動を行う転がり軸受において、保持器から転動体を介して固体潤滑剤を内輪の軌道面と外輪の軌道面に適切に移着されるようにして、潤滑不良の発生を防止することを課題とする。   In view of this, the present invention provides a rolling bearing that performs a swinging motion at a swinging angle θ so that the solid lubricant is appropriately transferred from the cage to the raceway surface of the inner ring and the raceway surface of the outer ring through the rolling elements. Thus, an object is to prevent the occurrence of poor lubrication.

上記の課題を解決するため、この発明は、保持器から転動体を介して固体潤滑剤を内輪の軌道面と外輪の軌道面に移着させるための軸受仕様を、転動体ピッチ円径(dp)と転動体径(dw)との関係から次のようにして導いたものである。   In order to solve the above problems, the present invention provides a bearing specification for transferring a solid lubricant from a cage to a raceway surface of an inner ring and a raceway surface of an outer ring via a rolling element. ) And the rolling element diameter (dw).

内輪回転の場合、転動体の自転数ｎa[rpm]と内輪回転数ｎi[rpm]の関係は式(１)で表される。 In the case of the inner ring rotation, the relationship between the rotation number n a [rpm] of the rolling element and the inner ring rotation number n i [rpm] is expressed by Expression (1).

Figure 2017172649
（1）
ここで、dp：転動体ピッチ円径［mm］、dw：転動体径［mm］、θ：内輪揺動角［°］、α：接触角［°］である。
Figure 2017172649
 (1)
Here, dp: rolling element pitch circle diameter [mm], dw: rolling element diameter [mm], θ: inner ring rocking angle [°], α: contact angle [°].

次に、1分間あたりの揺動回数nに対して、内輪回転数は式(2)で表される。   Next, the inner ring rotational speed is expressed by Equation (2) with respect to the number of times of swinging per minute n.

Figure 2017172649
Figure 2017172649

1回の揺動に着目するとｎ=1となり、1回の揺動で転動体が180°（1/2回転）以上自転するための条件は、式(1)及び(2)から以下となる。   When paying attention to one swing, n = 1, and the conditions for the rolling element to rotate 180 ° (1/2 rotation) or more by one swing are as follows from equations (1) and (2): .

Figure 2017172649
（3）
Figure 2017172649
 (3)

式(3)をdp/dwについて整理すると、式(4)が得られる。 Rearranging equation (3) with respect to d p / d w , equation (4) is obtained.

Figure 2017172649
(4)
Figure 2017172649
 (Four)

式(4)より、以下の関係式(5)が導かれる。   The following relational expression (5) is derived from the expression (4).

Figure 2017172649
Figure 2017172649

この発明によれば、上記式(5)に基づき、保持器から転動体を介して固体潤滑剤を内輪の軌道面と外輪の軌道面に移着させるのに必要なｄｐ／ｄｗを求めることができる。   According to the present invention, dp / dw required to transfer the solid lubricant from the cage to the raceway surface of the inner ring and the raceway surface of the outer ring based on the above formula (5) is obtained. it can.

本発明の実施形態の転がり軸受の断面図である。It is sectional drawing of the rolling bearing of embodiment of this invention. 図１の転がり軸受に用いられる保持器の構成を示す斜視図である。It is a perspective view which shows the structure of the holder | retainer used for the rolling bearing of FIG. 保持器からの固体潤滑剤の移着によって運転する転がり軸受の側面図である。It is a side view of the rolling bearing operated by transfer of the solid lubricant from a cage. （ａ）（ｂ）は、同一の転動体ピッチ円径dpを有する転がり軸受における転動体の自転運動を比較した側面図であり、（ａ）はdp/dwが大きい軸受、（ｂ）はdp/dwが小さい軸受を示している。(A) (b) is a side view comparing the rolling motion of rolling elements in a rolling bearing having the same rolling element pitch circle diameter d p , (a) is a bearing with a large dp / dw, and (b) is A bearing with a small dp / dw is shown. 揺動角と内・外輪軌道面への固体潤滑剤の移着に必要なdp/dw、軸受の接触面圧及び負荷容量の関係を示すグラフである。6 is a graph showing the relationship between the swing angle and dp / dw necessary for transferring the solid lubricant to the inner and outer ring raceway surfaces, the contact surface pressure of the bearing, and the load capacity.

以下、この発明の実施の形態を説明する。   Embodiments of the present invention will be described below.

この発明にかかる転がり軸受は、宇宙空間などの極低温環境下での使用に適用した転がり軸受であり、例えば、人工衛星などに用いられる。   The rolling bearing according to the present invention is a rolling bearing applied for use in a cryogenic environment such as outer space, and is used for, for example, an artificial satellite.

この転がり軸受１は、図１に示すように、外周面に軌道面４を有する内輪２と、内周面に軌道面５を有する外輪３と、内輪２の軌道面４と外輪３の軌道面５の間に配置された複数の転動体である玉６と、この複数の玉６を周方向に間隔をおいて保持する保持器７とを備えるアンギュラ玉軸受である。   As shown in FIG. 1, the rolling bearing 1 includes an inner ring 2 having a raceway surface 4 on an outer peripheral surface, an outer ring 3 having a raceway surface 5 on an inner peripheral surface, a raceway surface 4 of the inner ring 2 and a raceway surface of the outer ring 3. 5 is an angular ball bearing comprising a plurality of balls 6 which are a plurality of rolling elements arranged between 5 and a cage 7 which holds the plurality of balls 6 at intervals in the circumferential direction.

内輪２、外輪３、及び玉６は、通常の軸受材料を使用することができ、例えば、マルテンサイト系ステンレス鋼を用いることができる。なお、玉６としては、セラミックスボールであってもよい。セラミックスを使用する場合、窒化珪素（Ｓｉ3Ｎ4）、炭化珪素（ＳＩＣ）、アルミナ（ＡＩ2Ｏ3）、ジルコニア（ＺｒＯ2）、サイアロン等が挙げられる。 For the inner ring 2, the outer ring 3, and the ball 6, a normal bearing material can be used, for example, martensitic stainless steel can be used. The balls 6 may be ceramic balls. In the case of using ceramics, silicon nitride (Si 3 N 4 ), silicon carbide (SIC), alumina (AI 2 O 3 ), zirconia (ZrO 2 ), sialon and the like can be mentioned.

保持器７は、金属又は合成樹脂で構成され、図２に示すように、玉６が１つずつ収容される複数のポケット８を有し、図示例では２０個のポケット８が円周方向等間隔に設けられる。玉６は、各ポケット８のポケット面８ａで接触支持されて、ポケット８内に保持される。本実施形態にかかる転がり軸受１に使用される保持器７は、径方向の位置が外輪３の内周面によって案内される外輪案内方式の保持器となっている。図示を省略しているが、この転がり軸受１の潤滑は、固体潤滑方式であり、保持器７のポケット面８ａに固体潤滑剤又はこれを含んだ複合体による固体潤滑層が設けられる。更に、例えば、ガラス繊維にＰＴＦＥ（ポリテトラフロオロエチレン）を含侵させ、表層のガラス繊維を溶かしてＰＴＦＥ層を表面に露出させた保持器なども用いられる。母体表面にのみ設けた潤滑被膜は摩耗すると潤滑性能が消失するが、この場合、表層が摩耗しても順次潤滑層が現れるので潤滑性能は維持される。固体潤滑剤としては、グラファイト、二硫化タングステン又は二硫化モリブデン、ＰＴＦＥが使用される。また、保持器７から適量の潤滑剤が供給され、運転時において、ポケット面８ａに接触する玉６を介して内輪２及び外輪３の軌道面４、５に供給される。   The cage 7 is made of metal or synthetic resin, and has a plurality of pockets 8 in which balls 6 are accommodated one by one as shown in FIG. 2, and in the illustrated example, 20 pockets 8 have a circumferential direction or the like. Provided at intervals. The ball 6 is held in contact with the pocket surface 8 a of each pocket 8 and held in the pocket 8. The cage 7 used in the rolling bearing 1 according to the present embodiment is an outer ring guide type cage whose radial position is guided by the inner peripheral surface of the outer ring 3. Although not shown, the rolling bearing 1 is lubricated by a solid lubrication system, and a solid lubricant layer is provided on the pocket surface 8a of the cage 7 by a solid lubricant or a composite containing the same. Furthermore, for example, a cage in which glass fiber is impregnated with PTFE (polytetrafluoroethylene) and the surface glass fiber is melted to expose the PTFE layer on the surface is also used. When the lubricating coating provided only on the surface of the base is worn, the lubricating performance is lost. However, in this case, the lubricating layer is successively displayed even if the surface layer is worn, so that the lubricating performance is maintained. As the solid lubricant, graphite, tungsten disulfide or molybdenum disulfide, and PTFE are used. Further, an appropriate amount of lubricant is supplied from the cage 7 and is supplied to the raceway surfaces 4 and 5 of the inner ring 2 and the outer ring 3 through the balls 6 that are in contact with the pocket surface 8a during operation.

なお、以上の実施形態は、アンギュラ玉軸受について述べたが、本発明は、アンギュラ玉軸受に限定されるものではなく、例えば、深溝玉軸受、４点接触玉軸受、自動調心玉軸受、円筒ころ軸受、円錐ころ軸受、自動調心ころ軸受など、密封型の種々の転がり軸受に適用可能である。
この発明によれば、上記のように、式(5)を基に、各揺動角θ毎に対して保持器７から固体潤滑剤を、玉６を介して内輪２及び外輪３の軌道面４、５に移着させるのに必要なdp/dwを表1の通り求めることができる。 In addition, although the above embodiment described the angular ball bearing, this invention is not limited to an angular ball bearing, For example, a deep groove ball bearing, a 4-point contact ball bearing, a self-aligning ball bearing, a cylindrical The present invention is applicable to various sealed rolling bearings such as roller bearings, tapered roller bearings, and self-aligning roller bearings.
According to the present invention, as described above, based on the formula (5), the solid lubricant is supplied from the cage 7 for each swing angle θ, and the raceway surfaces of the inner ring 2 and the outer ring 3 through the balls 6. As shown in Table 1, d p / d w required to transfer to 4, 5 can be obtained.

揺動角θと内輪２及び外輪３の軌道面４、５への固体潤滑剤の移着に必要なdp/dwと、転がり軸受１の接触面圧及び負荷容量の関係は図５の通りであり、転動体が180°(1/２回転）以上自転可能な範囲は図５の斜線部分である。転動体が180°(1/２回転）以上自転可能であり、最も軸受の接触面圧を低減させ、軸受の負荷容量を大きくすることができるのは、転動体ピッチ円径(dp)と転動体径(dw)の関係が図５の放物線上にあたる式(6)の関係を満足する仕様の時である。   FIG. 5 shows the relationship between the swing angle θ, dp / dw required for transferring the solid lubricant to the raceway surfaces 4 and 5 of the inner ring 2 and the outer ring 3, and the contact surface pressure and load capacity of the rolling bearing 1. The range in which the rolling element can rotate 180 ° (1/2 rotation) or more is the shaded portion in FIG. The rolling element can rotate 180 ° (1/2 rotation) or more, and it can reduce the contact surface pressure of the bearing and increase the load capacity of the bearing. This is when the relationship of the moving body diameter (dw) satisfies the relationship of the equation (6), which is on the parabola of FIG.

Figure 2017172649
Figure 2017172649

Figure 2017172649
Figure 2017172649

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.

１ ：転がり軸受
２ ：内輪
３ ：外輪
４ ：内輪軌道面
５ ：外輪軌道面
６ ：玉
７ ：保持器
８ ：保持器ポケット
８ａ ：保持器ポケット面
θ ：揺動角 1: Rolling bearing 2: Inner ring 3: Outer ring 4: Inner ring raceway surface 5: Outer ring raceway surface 6: Ball 7: Cage 8: Cage pocket 8a: Cage pocket surface θ: Swing angle

Claims (4)

外周面に軌道面が形成された内輪と、内周面に軌道面が形成された外輪と、前記内輪と外輪の軌道面との間に組み込まれる複数の転動体と、前記内輪及び外輪の間に組み込まれ、転動体を介して固体潤滑剤を内輪の軌道面と外輪の軌道面とに移着させる保持器とを備え、揺動角θで揺動運動を行う転がり軸受において、転動体ピッチ円径(dp)と転動体径(dw)の関係が、次式を満足する軸受仕様であることを特徴とする転がり軸受。
Figure 2017172649
 但し、dp：転動体ピッチ円径［mm］
dw：転動体径［mm］
θ：内輪揺動角［°］
α：接触角［°］ An inner ring having a raceway surface formed on the outer peripheral surface, an outer ring having a raceway surface formed on the inner peripheral surface, a plurality of rolling elements incorporated between the inner ring and the raceway surface of the outer ring, and between the inner ring and the outer ring In a rolling bearing that includes a retainer for transferring the solid lubricant to the raceway surface of the inner ring and the raceway surface of the outer ring via the rolling element, and performs a swinging motion at a swinging angle θ, the rolling element pitch A rolling bearing characterized in that the relationship between the circular diameter (dp) and the rolling element diameter (dw) is a bearing specification that satisfies the following formula.
Figure 2017172649
 Where dp: rolling element pitch circle diameter [mm]
dw: Rolling element diameter [mm]
θ: Inner ring rocking angle [°]
α: Contact angle [°] 保持器から供給する固体潤滑剤として、二硫化モリブデン、二硫化タングステン、グラファイト、ポリテトラフルオロエチレンのいずれかを用いた請求項１に記載の転がり軸受。   The rolling bearing according to claim 1, wherein one of molybdenum disulfide, tungsten disulfide, graphite, and polytetrafluoroethylene is used as the solid lubricant supplied from the cage. 宇宙空間用として使用される前記請求項１又は２に記載の転がり軸受。   The rolling bearing according to claim 1 or 2, which is used for outer space. アンギュラ玉軸受である請求項１〜３のいずれかに記載の転がり軸受。   It is an angular ball bearing, The rolling bearing in any one of Claims 1-3.
JP2016057824A 2016-03-23 2016-03-23 Rolling bearing Pending JP2017172649A (en)

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CN111279089A (en) * 2017-11-16 2020-06-12 兹比格涅夫·库什尼雷维奇 Rolling bearing

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EP4375527A1 (en) * 2021-07-21 2024-05-29 Harmonic Drive Systems Inc. Space rolling bearing and space strain wave gearing device

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JP5211963B2 (en) * 2008-03-03 2013-06-12 日本精工株式会社 Ball bearing, conveyor, vacuum processing equipment
JP2011226624A (en) * 2010-04-23 2011-11-10 Nsk Ltd Rolling bearing for conveyer roller
JP2014020530A (en) * 2012-07-23 2014-02-03 Nsk Ltd Rolling bearing

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111279089A (en) * 2017-11-16 2020-06-12 兹比格涅夫·库什尼雷维奇 Rolling bearing
CN111279089B (en) * 2017-11-16 2022-02-01 兹比格涅夫·库什尼雷维奇 Rolling bearing

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