JP2014025548A - Rotary shaft device - Google Patents

Rotary shaft device Download PDF

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JP2014025548A
JP2014025548A JP2012167135A JP2012167135A JP2014025548A JP 2014025548 A JP2014025548 A JP 2014025548A JP 2012167135 A JP2012167135 A JP 2012167135A JP 2012167135 A JP2012167135 A JP 2012167135A JP 2014025548 A JP2014025548 A JP 2014025548A
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lubricating oil
outer periphery
ring
inner ring
rotary shaft
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Masa Sakaguchi
雅 阪口
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JTEKT Corp
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JTEKT Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a double-row ball bearing achieving low torque by optimizing the amount of lubricating oil existing in the bearing and suppressing agitating resistance due to the lubricating oil.SOLUTION: There is provided a rotary shaft device including a rolling bearing 1 which includes an outer ring 2, an inner ring 3, a plurality of rolling elements 5 arranged in double rows between both rings, and cages 6, 7 for holding the rolling elements 5, the inner ring 3 having an outer periphery on which a small-diameter outer periphery, a raceway surface where the rolling elements roll, and a large-diameter outer periphery are formed in sequence, the raceway surface having pumping action. In the rotary shaft device, lubricating oil is moved from a flow-in space to a drain space by the pumping action, a disc-shaped annular seal 8 extending in the radial direction is fitted to the inner periphery of the outer ring 2 or to the outer periphery of the inner ring 3, and a clearance L is formed between the annular seal 8 and the outer periphery of the inner ring 3 or the inner periphery of the outer ring 2.

Description

この発明は、ハウジングに転がり軸受を介して回転軸を回転可能に軸承した回転軸装置に関する。   The present invention relates to a rotary shaft device in which a rotary shaft is rotatably supported on a housing via a rolling bearing.

外輪、内輪、両輪の間に複列に配置された複数の玉、およびこれらの玉を保持する保持器を有するタンデム型の複列玉軸受の回転軸装置は、特許文献１に示されているように、車両用のピニオン軸支持装置などにおいて広く使用されている。   Patent Document 1 discloses a rotary shaft device for a tandem double row ball bearing having an outer ring, an inner ring, a plurality of balls arranged in a double row between both wheels, and a cage for holding these balls. Thus, it is widely used in a pinion shaft support device for a vehicle.

図４は、この発明による回転軸装置が対象としている１例のデファレンシャルギア装置を示すもので、デファレンシャルギア装置は、ハウジング４１に回転自在に支持されかつ内側端部にピニオンギア４３が配設されたピニオン軸４２と、ピニオンギア４３に噛み合わされたリングギヤ４４と、ピニオン軸４２をハウジング４１に回転自在に支持する内外１対の複列玉軸受４５，４６と、ピニオン軸４２の外側端部に設けられたドライブシャフト連結用フランジ継手４７とを備えている。   FIG. 4 shows an example of a differential gear device to which the rotary shaft device according to the present invention is applied. The differential gear device is rotatably supported by a housing 41 and a pinion gear 43 is disposed at an inner end thereof. A pinion shaft 42, a ring gear 44 meshed with the pinion gear 43, a pair of inner and outer double-row ball bearings 45 and 46 that rotatably support the pinion shaft 42 on the housing 41, and an outer end portion of the pinion shaft 42. And a drive shaft coupling flange joint 47 provided.

このデファレンシャルギア装置では、リングギヤ４４の回転に伴って跳ね上げられた潤滑油がハウジング４１内の潤滑油通路４８を介して１対の複列玉軸受４５，４６の軸方向中間に導入されている。複列玉軸受４５，４６が回転すると、小径側から大径側への傾斜面によるポンプ作用で流体の流れが発生する。リングギヤ４４の回転数の上昇に伴って軸受内部へ流入する潤滑油量が増加するので、リングギヤ４４の高回転時は、潤滑に必要な潤滑油量よりも多くなり、不要な量の潤滑油によって撹拌抵抗が増大し、トルクが増大することになる。回転トルク低減のためには、軸受内を通過する潤滑油の量を減らし、潤滑油による撹拌抵抗を抑制することが有効であり、そのために軸受内部に潤滑油を排出する機構を設けているものがある。   In this differential gear device, the lubricating oil splashed with the rotation of the ring gear 44 is introduced into the middle in the axial direction of the pair of double row ball bearings 45 and 46 via the lubricating oil passage 48 in the housing 41. . When the double row ball bearings 45 and 46 rotate, a fluid flow is generated by the pumping action by the inclined surface from the small diameter side to the large diameter side. As the rotational speed of the ring gear 44 increases, the amount of lubricating oil that flows into the bearing increases. Therefore, when the ring gear 44 rotates at a high speed, the amount of lubricating oil required for lubrication increases and an unnecessary amount of lubricating oil causes Stirring resistance increases and torque increases. In order to reduce rotational torque, it is effective to reduce the amount of lubricating oil that passes through the bearing and suppress the stirring resistance due to the lubricating oil. For this purpose, a mechanism for discharging the lubricating oil is provided inside the bearing. There is.

特開２００８−２２３９５７号公報JP 2008-223957 A

軸受内部に潤滑油を排出する機構を設ける構造は複雑となり、コスト大となっている。そこで、この発明の目的は、シールにより軸受内に供給される潤滑油の量を適正化して潤滑油による撹拌抵抗を抑制し、低トルク化を可能とした回転軸装置を提供することにある。   The structure of providing a mechanism for discharging the lubricating oil inside the bearing is complicated and increases the cost. SUMMARY OF THE INVENTION An object of the present invention is to provide a rotary shaft device that can reduce the torque by optimizing the amount of lubricating oil supplied into the bearing by the seal to suppress the stirring resistance by the lubricating oil.

この発明による回転軸装置は、ハウジングに転がり軸受を介して回転軸を回転可能に軸承し、前記転がり軸受の軸方向の一方に潤滑油の流入空間を設け、前記転がり軸受の軸方向の他方に潤滑油の排出空間を設け、前記転がり軸受は、外輪、内輪、両輪の間に複列に配置された複数の転動体、およびこれらの転動体を保持する保持器を備えており、前記内輪の外周に、小径外周、転動体が転動する軌道面、大径外周が順に形成され、前記軌道面のポンプ作用によって潤滑油が前記流入空間から前記排出空間へ移動させられる回転軸装置において、前記外輪の内周または前記内輪の外周に径方向に延びる円盤状の環状シールを固定し、この環状シールおよび前記内輪の外周または前記外輪の内周の間にすきまを形成したことを要旨としている。   In the rotary shaft device according to the present invention, a rotary shaft is rotatably supported by a housing via a rolling bearing, a lubricating oil inflow space is provided in one of the axial directions of the rolling bearing, and the other of the rolling bearings in the axial direction. Lubricating oil discharge space is provided, and the rolling bearing includes an outer ring, an inner ring, a plurality of rolling elements arranged in a double row between the two rings, and a cage for holding these rolling elements. In the outer periphery, a small-diameter outer periphery, a raceway surface on which the rolling element rolls, and a large-diameter outer periphery are formed in order, and the rotary shaft device in which the lubricating oil is moved from the inflow space to the discharge space by the pump action of the raceway surface The gist is that a disc-shaped annular seal extending in the radial direction is fixed to the inner circumference of the outer ring or the outer circumference of the inner ring, and a gap is formed between the annular seal and the outer circumference of the inner ring or the inner circumference of the outer ring.

本発明によれば、回転軸装置の軸受の内輪または外輪に、潤滑油の流入を規制するシールが設けられているため、複列玉軸受の軸受内部への潤滑油供給量は制御されることで軸受内部に供給される潤滑油量が適正に保たれて、潤滑油による撹拌抵抗を抑制し、低トルク化を可能とした回転軸装置を提供できる。   According to the present invention, since the seal that restricts the inflow of the lubricating oil is provided on the inner ring or the outer ring of the bearing of the rotary shaft device, the supply amount of the lubricating oil into the bearing of the double row ball bearing is controlled. Thus, it is possible to provide a rotary shaft device that can keep the amount of lubricating oil supplied to the inside of the bearing properly, suppress the stirring resistance due to the lubricating oil, and reduce the torque.

さらに、本発明は、前記環状シールに、前記内輪の外周または前記外輪の内周の間にすきまを形成する円筒状の円筒部が形成されていることを要旨としている。そのため、環状シールの円筒部で内輪または外輪の径方向のすきまのみならず、円筒部の軸方向長さを適正に確保できるため、複列玉軸受の軸受内部への潤滑油供給量は制御されることで軸受内部に供給される潤滑油量がより適正に保たれて、潤滑油による撹拌抵抗をより抑制し、低トルク化を可能とした回転軸装置を提供できる。   Furthermore, the gist of the present invention is that the annular seal is formed with a cylindrical cylindrical portion that forms a gap between the outer periphery of the inner ring or the inner periphery of the outer ring. Therefore, not only the radial clearance of the inner ring or outer ring in the cylindrical part of the annular seal but also the axial length of the cylindrical part can be properly secured, so the amount of lubricating oil supplied to the bearing inside the double row ball bearing is controlled. As a result, the amount of lubricating oil supplied to the inside of the bearing can be maintained more appropriately, the stirring resistance due to the lubricating oil can be further suppressed, and a rotary shaft device capable of reducing torque can be provided.

この発明の回転軸装置によると、シールにより、回転数の増加とともにこの潤滑油入り口から供給される潤滑油量の増加を防止することによって、軸受内部に供給される潤滑油量が適正に保たれ、低トルク化が可能となる回転軸装置を提供できる。   According to the rotary shaft device of the present invention, the amount of lubricating oil supplied to the inside of the bearing is properly maintained by preventing an increase in the amount of lubricating oil supplied from the lubricating oil inlet with an increase in the rotational speed by the seal. Thus, it is possible to provide a rotary shaft device that can reduce torque.

本発明の回転軸装置の１実施形態を示す上半部の縦断面図The longitudinal cross-sectional view of the upper half which shows one Embodiment of the rotating shaft apparatus of this invention 第２実施形態の回転軸装置の形態を示す上半部の縦断面図The longitudinal cross-sectional view of the upper half part which shows the form of the rotating shaft apparatus of 2nd Embodiment 第３実施形態の回転軸装置の形態を示す上半部の縦断面図The longitudinal cross-sectional view of the upper half part which shows the form of the rotating shaft apparatus of 3rd Embodiment 従来の回転軸装置が使用される１例としてのデファレンシャルギア装置を示す縦断面図A longitudinal sectional view showing a differential gear device as an example in which a conventional rotary shaft device is used.

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

図１は、この発明による複列玉軸受の軸装置の１実施形態を示している。この複列玉軸受１は、互いに径が相違する複列の軌道面２ａ、２ｂを有しハウジング１０に取り付けられる外輪２と、外輪２の各軌道面２ａ、２ｂと対応する複列の軌道面３ａ、３ｂを有し回転軸（図示略）に取り付けられる内輪３と、両輪２，３の各列の軌道面２ａ、３ａ、２ｂ、３ｂ間に異なるピッチ円径をもって配置される複数の大径側玉４および複数の小径側玉５と、複数の大径側玉４を保持する大径側保持器６および複数の小径側玉５を保持する小径側保持器７とを備えている。   FIG. 1 shows an embodiment of a shaft device for a double row ball bearing according to the present invention. This double-row ball bearing 1 has double-row raceway surfaces 2a and 2b having different diameters and attached to the housing 10, and double-row raceway surfaces corresponding to the raceway surfaces 2a and 2b of the outer ring 2. A plurality of large diameters arranged with different pitch circle diameters between the inner ring 3 having 3a, 3b and attached to a rotating shaft (not shown) and the raceway surfaces 2a, 3a, 2b, 3b of each row of the wheels 2, 3 A side ball 4 and a plurality of small-diameter side balls 5, a large-diameter side cage 6 that holds the plurality of large-diameter side balls 4, and a small-diameter side cage 7 that holds the plurality of small-diameter side balls 5 are provided.

ハウジング１０には、複列玉軸受１の小径側に潤滑油を供給するための潤滑油供給通路１０ａが設けられている。   The housing 10 is provided with a lubricating oil supply passage 10 a for supplying lubricating oil to the small diameter side of the double row ball bearing 1.

同図において、内輪３の左側の軌道面３ｂの外径は、内輪３の右側の軌道面３aの外径よりも小さく、かつ、外輪２の左側の軌道面２ｂの内径は、外輪２の右側の軌道面２aの内径よりも小さくなっている。大径側玉４および小径側玉５の接触角は、同じ向き（同じ角度に限定されるものではない）とされている。また、各保持器６，７は、全体として左側から右側に行くにしたがって径が大きくなるテーパ筒状に形成されている。潤滑油は、図の左側（すなわち小径側）から供給され、複列玉軸受１のポンプ作用によって、図の右側（すなわち大径側）から排出される。   In the figure, the outer diameter of the left raceway surface 3 b of the inner ring 3 is smaller than the outer diameter of the right raceway surface 3 a of the inner ring 3, and the inner diameter of the left raceway surface 2 b of the outer ring 2 is the right side of the outer ring 2. It is smaller than the inner diameter of the track surface 2a. The contact angles of the large-diameter side ball 4 and the small-diameter side ball 5 are the same direction (not limited to the same angle). Each cage 6, 7 is formed in a tapered cylindrical shape whose diameter increases as it goes from the left side to the right side as a whole. Lubricating oil is supplied from the left side (that is, the small diameter side) of the drawing, and is discharged from the right side (that is, the large diameter side) of the drawing by the pump action of the double row ball bearing 1.

外輪２の両端部内周部にシール８が固定されている。シール８は、外輪２の両端部内周部にかしめ嵌合されるかしめ部８a、と、かしめ部８aより径方向内方に延びる環状部８ｂと、環状部８ｂの内縁より軸方向に延在する円筒部８ｃを備え、この円筒部８ｃと、内輪３の端部にもうけられた段差部３ｃの外周面３ｄとの間ですきまＬを形成している。シール８の材料としては、例えば、防錆処理された冷延鋼板のＳＰＣＣが用いられ、プレス加工して形成される。   Seals 8 are fixed to the inner periphery of both ends of the outer ring 2. The seal 8 includes a caulking portion 8a that is caulked and fitted to inner peripheral portions at both ends of the outer ring 2, an annular portion 8b that extends radially inward from the caulking portion 8a, and an axial direction extending from the inner edge of the annular portion 8b. A cylindrical portion 8 c is provided, and a clearance L is formed between the cylindrical portion 8 c and the outer peripheral surface 3 d of the stepped portion 3 c provided at the end of the inner ring 3. As a material of the seal 8, for example, SPCC of a cold-rolled steel sheet that has been rust-proofed is used and formed by pressing.

保持器６、７は、例えばＰＰＳ、ＰＥＥＫ、ＰＡ、ＰＰＡ、ＰＡＩ等のスーパーエンプラで一体成形される。保持器６、７に、機械的強度、耐油性および耐熱性に優れたエンジニアリング・プラスチックを使用することにより、鉄板製保持器に比べ、保持器重量が軽く、自己潤滑性があり、摩擦係数が小さいという特徴があるため、軸受内に介在する潤滑油の効果と相俟って、外輪との接触による摩耗の発生を抑えることが可能になる。また、これらの樹脂は鋼板と比べると重量が軽く摩擦係数が小さいため、軸受起動時のトルク損失や保持器摩耗の低減に好適である。エンジニアリング・プラスチックは、汎用エンジニアリング・プラスチックとスーパー・エンジニアリング・プラスチックを含む。なお、保持器材料の例としてＰＰＳ、ＰＥＥＫ、ＰＡ、ＰＰＡ、ＰＡＩ等のスーパーエンプラを挙げたが、必要に応じて、強度増強のため、これら樹脂材料またはその他のエンジニアリング・プラスチックに、ガラス繊維または炭素繊維などを配合したものを使用してもよい。   The cages 6 and 7 are integrally formed with a super engineering plastic such as PPS, PEEK, PA, PPA, or PAI. By using engineering plastics with excellent mechanical strength, oil resistance and heat resistance for the cages 6 and 7, the cage weight is lighter, self-lubricating, and the coefficient of friction is higher than that of steel plate cages. Since it is small, it is possible to suppress the occurrence of wear due to contact with the outer ring in combination with the effect of the lubricating oil interposed in the bearing. In addition, these resins are lighter and have a smaller coefficient of friction than steel plates, and are therefore suitable for reducing torque loss and cage wear at the start of the bearing. Engineering plastics include general purpose engineering plastics and super engineering plastics. Although examples of cage materials include super engineering plastics such as PPS, PEEK, PA, PPA, PAI, etc., if necessary, these resin materials or other engineering plastics may be made of glass fiber or What mix | blended carbon fiber etc. may be used.

この発明の複列玉軸受の軸装置の構成によれば、上述のように、外輪２にシール８が設けられているので、回転数が大きくなり多くの潤滑油がきてもシール８の環状部８ｂおよび円筒部８ｂのすきまＬにより遮蔽されて調節できるため、この結果、複列玉軸受１内部に供給される潤滑油量が適正に保たれ、低トルク化が可能となる。   According to the configuration of the shaft device of the double row ball bearing of the present invention, since the seal 8 is provided on the outer ring 2 as described above, the annular portion of the seal 8 even if the rotational speed increases and a lot of lubricating oil is applied. Since it can be adjusted by being shielded by the clearance L between 8b and the cylindrical portion 8b, the amount of lubricating oil supplied to the inside of the double row ball bearing 1 is appropriately maintained, and torque can be reduced.

図２には第２実施形態例を示す。第２実施形態では複列玉軸受１００の外輪１０２の両端部内周部に固定されているシール１０８は、環状部１０８ｂの内縁より軸方向に延在する円筒部１０８ｃの長さｍを備え、この円筒部１０８ｃと、内輪１０３の外周面１０３ｃとの間ですきまＬを形成している。   FIG. 2 shows a second embodiment. In the second embodiment, the seal 108 fixed to the inner peripheral portions of both ends of the outer ring 102 of the double row ball bearing 100 includes a length m of a cylindrical portion 108c extending in the axial direction from the inner edge of the annular portion 108b. A clearance L is formed between the cylindrical portion 108 c and the outer peripheral surface 103 c of the inner ring 103.

この構成によると、すきまＬとすきまＬの軸方向長さｍのラビリンスの調整範囲が拡大でき、その調整をすることにより、軸受へ流入する量をさらに最適に調整できる。この結果、軸受１内部に供給される潤滑油量が適正に保たれ、低トルク化が可能となる。   According to this configuration, the adjustment range of the labyrinth of the clearance L and the axial length m of the clearance L can be expanded, and the amount flowing into the bearing can be adjusted more optimally by adjusting the adjustment range. As a result, the amount of lubricating oil supplied to the inside of the bearing 1 is properly maintained, and the torque can be reduced.

図３には第３実施形態例を示す。第３実施形態では複列玉軸受２００の内輪２０３の両端部外周部に固定されているシール２０８は、環状部２０８ｂの内縁より軸方向に延在する円筒部２０８ｃの長さｍを備え、この円筒部２０８ｃと、外輪１０２の外周面１０２ｃとの間ですきまＬを形成している。   FIG. 3 shows a third embodiment. In the third embodiment, the seal 208 fixed to the outer peripheral portions of both ends of the inner ring 203 of the double row ball bearing 200 has a length m of a cylindrical portion 208c extending in the axial direction from the inner edge of the annular portion 208b. A clearance L is formed between the cylindrical portion 208 c and the outer peripheral surface 102 c of the outer ring 102.

この構成によれば、内輪２０３の回転とともにシール２０８が回転することで、振り切り効果により、内輪２０３の回転による供給油量の変化を抑えることができ、軸受２００への潤滑油の流入量を調節できるとともに、隙間Ｌを形成するシール円筒部２０８ｃの軸方向の長さｍを調整することにより、さらに最適に潤滑油量を適正に保ち低トルク化が可能となる。   According to this configuration, since the seal 208 rotates together with the rotation of the inner ring 203, a change in the amount of supplied oil due to the rotation of the inner ring 203 can be suppressed by the swing-off effect, and the amount of lubricating oil flowing into the bearing 200 is adjusted. In addition, by adjusting the axial length m of the seal cylindrical portion 208c that forms the gap L, the amount of lubricating oil can be kept optimally and the torque can be reduced.

本発明はこうした実施形態に何等限定されるものではなく、本発明の要旨を逸脱しない範囲において、種々なる態様で実施し得ることは勿論である。   The present invention is not limited to these embodiments, and can of course be implemented in various modes without departing from the gist of the present invention.

上述した実施形態は、図１のシール８として金属板からなるシールを挙げた。他の実施形態として、シール７は、金属製の環状芯金と、ゴム製の弾性体とからなるものを使用した非接触シールであっても良い。また、シール８は内輪外周部３ｃにかしめ嵌合されているが、圧入嵌合で設けても良い。   In the embodiment described above, a seal made of a metal plate is used as the seal 8 in FIG. As another embodiment, the seal 7 may be a non-contact seal using a metal annular cored bar and a rubber elastic body. Further, the seal 8 is caulked and fitted to the inner ring outer peripheral portion 3c, but may be provided by press fitting.

なお、上記において、軌道面２a、２ｂ、３a、３ｂの径が異なるタンデム型の複列玉軸受１について説明したが、上記の外輪２にシール８が設けられる構成は、軌道面の径が等しい複列玉軸受にも適用することができる。また、この発明の複列玉軸受１は、デファレンシャルギア装置のピニオン軸を支持する用途のほか、トランスアクスル装置のピニオン軸を支持する軸受などとしても使用できることはもちろんである。   In the above description, the tandem double-row ball bearing 1 in which the raceways 2a, 2b, 3a, and 3b have different diameters has been described. However, the configuration in which the seal 8 is provided on the outer ring 2 has the same raceway diameter. It can also be applied to double row ball bearings. The double-row ball bearing 1 of the present invention can be used not only for supporting the pinion shaft of the differential gear device but also as a bearing for supporting the pinion shaft of the transaxle device.

１…複列玉軸受、２…外輪、３…内輪、５…転動体、６、７…保持器、８…シール、１０…ハウジング、Ｌ…すきま DESCRIPTION OF SYMBOLS 1 ... Double row ball bearing, 2 ... Outer ring, 3 ... Inner ring, 5 ... Rolling element, 6, 7 ... Cage, 8 ... Seal, 10 ... Housing, L ... Clearance

Claims (2)

ハウジングに転がり軸受を介して回転軸を回転可能に軸承し、前記転がり軸受の軸方向の一方に潤滑油の流入空間を設け、前記転がり軸受の軸方向の他方に潤滑油の排出空間を設け、前記転がり軸受は、外輪、内輪、両輪の間に複列に配置された複数の転動体、およびこれらの転動体を保持する保持器を備えており、前記内輪の外周に、小径外周、転動体が転動する軌道面、大径外周が順に形成され、前記軌道面のポンプ作用によって潤滑油が前記流入空間から前記排出空間へ移動させられる回転軸装置において、前記外輪の内周または前記内輪の外周に径方向に延びる円盤状の環状シールを固定し、この環状シールおよび前記内輪の外周または前記外輪の内周の間にすきまを形成したことを特徴とする回転軸装置。 A rotating shaft is rotatably supported on the housing via a rolling bearing, a lubricating oil inflow space is provided in one axial direction of the rolling bearing, and a lubricating oil discharge space is provided in the other axial direction of the rolling bearing, The rolling bearing includes an outer ring, an inner ring, a plurality of rolling elements arranged in a double row between the two rings, and a cage that holds these rolling elements, and a small-diameter outer periphery and a rolling element on the outer periphery of the inner ring. In the rotary shaft device in which the raceway surface and the large-diameter outer periphery are sequentially formed and the lubricating oil is moved from the inflow space to the discharge space by the pumping action of the raceway surface, the inner periphery of the outer ring or the inner ring A rotary shaft device characterized in that a disk-shaped annular seal extending in the radial direction is fixed to the outer periphery, and a gap is formed between the annular seal and the outer periphery of the inner ring or the inner periphery of the outer ring. 前記環状シールに、前記内輪の外周または前記外輪の内周の間にすきまを形成する円筒状の円筒部が形成されていることを特徴とする請求項１に記載の回転軸装置。 The rotary shaft device according to claim 1, wherein the annular seal is formed with a cylindrical cylindrical portion that forms a gap between an outer periphery of the inner ring or an inner periphery of the outer ring.
JP2012167135A 2012-07-27 2012-07-27 Rotary shaft device Pending JP2014025548A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102552436B1 (en) * 2022-07-08 2023-07-11 (주)연합시스템 Lubricating oil circulation structure of high-speed bearings

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001027253A (en) * 1999-07-14 2001-01-30 Nsk Ltd Rolling bearing
JP2004245231A (en) * 2002-12-19 2004-09-02 Koyo Seiko Co Ltd Ball bearing
JP2005188679A (en) * 2003-12-26 2005-07-14 Koyo Seiko Co Ltd Ball bearing

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001027253A (en) * 1999-07-14 2001-01-30 Nsk Ltd Rolling bearing
JP2004245231A (en) * 2002-12-19 2004-09-02 Koyo Seiko Co Ltd Ball bearing
JP2005188679A (en) * 2003-12-26 2005-07-14 Koyo Seiko Co Ltd Ball bearing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102552436B1 (en) * 2022-07-08 2023-07-11 (주)연합시스템 Lubricating oil circulation structure of high-speed bearings

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