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JP2024086328A - Rolling bearings - Google Patents

Rolling bearings Download PDF

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Publication number
JP2024086328A
JP2024086328A JP2022201399A JP2022201399A JP2024086328A JP 2024086328 A JP2024086328 A JP 2024086328A JP 2022201399 A JP2022201399 A JP 2022201399A JP 2022201399 A JP2022201399 A JP 2022201399A JP 2024086328 A JP2024086328 A JP 2024086328A
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Prior art keywords
outer ring
groove
raceway groove
rolling bearing
ring raceway
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Pending
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JP2022201399A
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Inventor
松本　小次郎
Kojiro Matsumoto
大樹 安瀬
Daiki Yasuse
高庸 小野澤
Takayasu Onozawa
勇磨 新谷
Yuma SHINTANI
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NSK Ltd
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NSK Ltd
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Priority to JP2022201399A priority Critical patent/JP2024086328A/en
Priority to CN202380086387.4A priority patent/CN120380258A/en
Priority to PCT/JP2023/032293 priority patent/WO2024127741A1/en
Publication of JP2024086328A publication Critical patent/JP2024086328A/en
Pending legal-status Critical Current

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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
    • F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
    • F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or 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
    • F16C33/58—Raceways; Race rings
    • 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
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces

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

Abstract

To provide a rolling bearing capable of increasing the load capacity while reducing stress on an outer ring, by enabling the formation of an annular groove for an O-ring without reducing the thickness of an outer ring raceway groove, or lowering the rigidity of an outer ring.SOLUTION: A rolling bearing 10 includes: an outer ring 20 in an inner peripheral face 22 of which an outer ring raceway groove 21 is provided and in an outer peripheral face 23 of which an annular groove 24 is provided for an O-ring 42 to be mounted therein; an inner ring 30 in an outer peripheral face 32 of which an inner ring raceway groove 31 is provided; and a plurality of rolling elements 40 rollably arranged between the outer ring raceway groove 21 and the inner ring raceway groove 31. When the rolling bearing 10 is viewed from the radial direction, the outer ring raceway groove 21 and the annular groove 24 do not overlap with each other.SELECTED DRAWING: Figure 1

Description

本発明は、転がり軸受に関する。 The present invention relates to a rolling bearing.

ハウジングと外輪が隙間嵌めの場合、外輪の外周面でクリープが発生する可能性があるため、従来より、外輪の外周面とハウジングの内周面との間にＯリングなどの環状弾性体を配置して、クリープの発生を防止することが知られている。具体的には、外輪の外周面に形成した環状溝にＯリングを装着するものが知られる。しかしながら、外輪の外周面に環状溝を形成すると、外輪の剛性が低下し、重荷重条件下では、外輪の外周面が波打ち変形することによりクリープが発生する虞がある。 When there is a clearance fit between the housing and the outer ring, creep may occur on the outer peripheral surface of the outer ring, and so it has been known in the past to prevent creep by placing an annular elastic body such as an O-ring between the outer peripheral surface of the outer ring and the inner peripheral surface of the housing. Specifically, an O-ring is fitted into an annular groove formed in the outer peripheral surface of the outer ring. However, forming an annular groove on the outer peripheral surface of the outer ring reduces the rigidity of the outer ring, and under heavy load conditions, there is a risk of creep occurring due to wavy deformation of the outer peripheral surface of the outer ring.

特許文献１には、外輪の径方向最小肉厚及び環状溝と外輪軌道面との間の最小肉厚を数値限定することにより、外輪の剛性低下を抑制し、波打ち変形によるクリープを防止するようにした転がり軸受が開示されている。 Patent Document 1 discloses a rolling bearing that limits the minimum radial thickness of the outer ring and the minimum thickness between the annular groove and the outer ring raceway surface to prevent a decrease in the rigidity of the outer ring and to prevent creep due to wave deformation.

特許第６０６４７８３号公報Japanese Patent No. 6064783

しかしながら、特許文献１に記載の転がり軸受では、径方向から見たとき、Ｏリングを装着するための円環溝が外輪軌道面と重なっているため、外輪軌道面下の肉厚の低下は避けられない。また、数値限定された各部での肉厚を適正な肉厚に維持するためには加工が複雑になり、製作コストが嵩む問題がある。 However, in the rolling bearing described in Patent Document 1, when viewed from the radial direction, the annular groove for mounting the O-ring overlaps with the outer ring raceway surface, so a reduction in the thickness below the outer ring raceway surface is unavoidable. In addition, in order to maintain the appropriate thickness at each numerically limited portion, the processing becomes complicated, resulting in problems of increased manufacturing costs.

本発明は、前述した課題に鑑みてなされたものであり、その目的は、外輪軌道溝の肉厚を減らさずに、即ち、外輪の剛性を低下させることなく、Ｏリング用の円環溝を形成可能とし、外輪に作用する応力を低減して負荷容量を大きくすることができる転がり軸受を提供することにある。 The present invention was made in consideration of the above-mentioned problems, and its purpose is to provide a rolling bearing that can form an annular groove for an O-ring without reducing the thickness of the outer ring raceway groove, i.e., without reducing the rigidity of the outer ring, and that can reduce the stress acting on the outer ring and increase the load capacity.

本発明の上記目的は、下記の構成により達成される。
［１］ 内周面に外輪軌道溝が設けられ、外周面にＯリングを装着するための円環溝が設けられた外輪と、外周面に内輪軌道溝が設けられた内輪と、前記外輪軌道溝及び前記内輪軌道溝間に転動自在に配設された複数の転動体と、を備える転がり軸受であって、
前記転がり軸受を径方向から見たとき、前記外輪軌道溝と前記円環溝とは重ならない、転がり軸受。 The above object of the present invention can be achieved by the following configuration.
[1] A rolling bearing comprising: an outer ring having an outer ring raceway groove on its inner peripheral surface and an annular groove for mounting an O-ring on its outer peripheral surface; an inner ring having an inner ring raceway groove on its outer peripheral surface; and a plurality of rolling elements disposed between the outer ring raceway groove and the inner ring raceway groove so as to be able to roll,
A rolling bearing, wherein the outer ring raceway groove and the annular groove do not overlap when the rolling bearing is viewed in a radial direction.

本発明の転がり軸受によれば、外輪軌道溝の肉厚を減らさずに、即ち、外輪の剛性を低下させることなく、Ｏリング用の円環溝を形成可能として、外輪に作用する応力を低減して転がり軸受の負荷容量を大きくすることができる。 The rolling bearing of the present invention makes it possible to form an annular groove for an O-ring without reducing the thickness of the outer ring raceway groove, i.e., without reducing the rigidity of the outer ring, thereby reducing the stress acting on the outer ring and increasing the load capacity of the rolling bearing.

本発明に係る一実施形態の転がり軸受の断面図である。1 is a cross-sectional view of a rolling bearing according to an embodiment of the present invention. 図１に示す転がり軸受の外輪の断面図である。FIG. 2 is a cross-sectional view of the outer ring of the rolling bearing shown in FIG.

以下、本発明に係る転がり軸受の一実施形態を図面に基づいて詳細に説明する。なお、以下の説明では、転がり軸受の一例として深溝玉軸受について説明する。 Below, one embodiment of a rolling bearing according to the present invention will be described in detail with reference to the drawings. In the following explanation, a deep groove ball bearing will be described as an example of a rolling bearing.

図１に示すように、本実施形態の転がり軸受（玉軸受）１０は、内周面２２に外輪軌道溝２１を有し、外周面２３にＯリング４２を装着するための一対の円環溝２４が形成された外輪２０と、外周面３２に内輪軌道溝３１を有する内輪３０と、外輪軌道溝２１と内輪軌道溝３１との間に転動自在に配置される複数の玉４０（転動体）と、複数の玉４０を回動自在に保持する保持器４１を備える。 As shown in FIG. 1, the rolling bearing (ball bearing) 10 of this embodiment includes an outer ring 20 having an outer ring raceway groove 21 on its inner peripheral surface 22 and a pair of annular grooves 24 formed on its outer peripheral surface 23 for mounting an O-ring 42, an inner ring 30 having an inner ring raceway groove 31 on its outer peripheral surface 32, a number of balls 40 (rolling elements) arranged to roll freely between the outer ring raceway groove 21 and the inner ring raceway groove 31, and a cage 41 that holds the balls 40 to rotate freely.

外輪２０は、不図示のハウジングに設けられた軸受取付け穴等に内嵌され、Ｏリング４２の弾性力により外輪２０のクリープを防止している。また、内輪３０は、図示しない軸に外嵌支持されている。 The outer ring 20 is fitted into a bearing mounting hole or the like provided in a housing (not shown), and the elastic force of the O-ring 42 prevents creep of the outer ring 20. The inner ring 30 is fitted and supported on the outside of a shaft (not shown).

また、外輪２０は、その内周面２２の軸方向両端部に断面略Ｌ字形に切り欠かれた一対の封止溝２５が形成されている。封止溝２５には、それぞれ非接触型封止部材の一例であるスリンガ４３が圧入されて装着されている。スリンガ４３は、内輪３０の外周面３２との間にラビリンスシールを形成して、外輪２０の内周面２２と内輪３０の外周面３２との間の軸受空間Ｓを封止する。なお、封止部材は、スリンガ４３に限定されず、金属製芯金にゴムなどのリップ部が一体成形され、リップ部が内輪３０の外周面３２に摺接する接触型封止部材であってもよい。 The outer ring 20 has a pair of sealing grooves 25 cut into an approximately L-shaped cross section at both axial ends of its inner peripheral surface 22. Slingers 43, which are an example of a non-contact type sealing member, are press-fitted into each of the sealing grooves 25. The slingers 43 form a labyrinth seal with the outer peripheral surface 32 of the inner ring 30 to seal the bearing space S between the inner peripheral surface 22 of the outer ring 20 and the outer peripheral surface 32 of the inner ring 30. The sealing member is not limited to the slinger 43, and may be a contact type sealing member in which a lip portion made of rubber or the like is integrally formed with a metal core and the lip portion slides against the outer peripheral surface 32 of the inner ring 30.

図２も参照して、外輪２０は、径方向から見たとき、外輪軌道溝２１と円環溝２４とが軸方向で重ならないように形成されている。換言すれば、外輪軌道溝２１が形成される領域Ａと、円環溝２４が形成される領域Ｂとは、軸方向で重ならないように軸方向に離れて形成されている。 Referring also to FIG. 2, the outer ring 20 is formed such that the outer ring raceway groove 21 and the annular groove 24 do not overlap in the axial direction when viewed from the radial direction. In other words, the region A where the outer ring raceway groove 21 is formed and the region B where the annular groove 24 is formed are formed axially separated so as not to overlap in the axial direction.

さらに、外輪２０は、径方向から見たとき、封止溝２５と円環溝２４とが軸方向で重ならないように形成されている。換言すれば、外輪２０のうち、円環溝２４が形成される領域Ｂと、封止溝２５が形成される領域Ｃとは、軸方向で重ならないように軸方向に離れて形成されている。このように、一対の円環溝２４は、外輪２０の外周面２３の軸方向両端部から所定距離内側に隔てた位置に形成されている。この所定距離は、上述の通り、円環溝２４が形成される領域Ｂが外輪軌道溝２１が形成される領域Ａ及び封止溝２５が形成される領域Ｃに重ならないように（領域Ｂが領域Ａ及び領域Ｃの軸方向における間に配置されるように）、設定される。 Furthermore, the outer ring 20 is formed so that the sealing groove 25 and the annular groove 24 do not overlap in the axial direction when viewed from the radial direction. In other words, the region B of the outer ring 20 where the annular groove 24 is formed and the region C where the sealing groove 25 is formed are formed axially apart so as not to overlap in the axial direction. In this way, the pair of annular grooves 24 are formed at positions spaced a predetermined distance inward from both axial ends of the outer peripheral surface 23 of the outer ring 20. As described above, this predetermined distance is set so that the region B where the annular groove 24 is formed does not overlap with the region A where the outer ring raceway groove 21 is formed and the region C where the sealing groove 25 is formed (so that the region B is disposed between the regions A and C in the axial direction).

これにより、外輪２０の外周面２３に円環溝２４が形成されても、外輪軌道溝２１が形成される位置の外輪２０の肉厚や、封止溝２５が形成される位置の外輪２０の肉厚が削減されることがなく、元の肉厚が保たれて、外輪２０の強度が維持される。 As a result, even if an annular groove 24 is formed on the outer peripheral surface 23 of the outer ring 20, the thickness of the outer ring 20 at the position where the outer ring raceway groove 21 is formed and the thickness of the outer ring 20 at the position where the sealing groove 25 is formed are not reduced, and the original thickness is maintained, thereby maintaining the strength of the outer ring 20.

従って、円環溝２４が形成されてもなお、外輪軌道溝２１の元の肉厚が保たれる本実施形態の転がり軸受１０と、外輪軌道溝２１の肉厚が円環溝２４の形成により削減される従来の転がり軸受とに、同じ大きさの荷重が作用した場合を比較すると、本実施形態の転がり軸受１０の外輪２０に作用する応力は低減される。従って、応力が低減した分だけ玉軸受１０の負荷容量を大きくすることができる。また、円環溝２４の加工による外輪軌道溝２１及び封止溝２５の変形を抑制することができ、外輪２０の形状精度が維持されて玉軸受１０の寿命が向上に寄与する。 Therefore, when comparing the rolling bearing 10 of this embodiment, in which the original thickness of the outer ring raceway groove 21 is maintained even after the annular groove 24 is formed, with a conventional rolling bearing in which the thickness of the outer ring raceway groove 21 is reduced by the formation of the annular groove 24, when the same load is applied to the rolling bearing 10 of this embodiment, the stress acting on the outer ring 20 of the rolling bearing 10 is reduced. Therefore, the load capacity of the ball bearing 10 can be increased by the amount of the reduced stress. In addition, deformation of the outer ring raceway groove 21 and the sealing groove 25 due to the processing of the annular groove 24 can be suppressed, and the shape precision of the outer ring 20 is maintained, contributing to improving the life of the ball bearing 10.

尚、本発明は、前述した実施形態に限定されるものではなく、適宜、変形、改良、等が可能である。例えば、上記の実施形態では、転がり軸受の一例として深溝玉軸受について説明したが、深溝玉軸受に限定されず、アンギュラ玉軸受、円筒ころ軸受、円錐ころ軸受などの他の任意の形態の軸受にも適用することができ、同様の効果を奏する。 The present invention is not limited to the above-described embodiment, and can be modified, improved, etc. as appropriate. For example, in the above embodiment, a deep groove ball bearing is described as an example of a rolling bearing, but the present invention is not limited to deep groove ball bearings, and can be applied to any other type of bearing, such as an angular ball bearing, a cylindrical roller bearing, or a tapered roller bearing, and achieves the same effects.

以上の通り、本明細書には次の事項が開示されている。
（１） 内周面に外輪軌道溝が設けられ、外周面にＯリングを装着するための円環溝が設けられた外輪と、外周面に内輪軌道溝が設けられた内輪と、前記外輪軌道溝及び前記内輪軌道溝間に転動自在に配設された複数の転動体と、を備える転がり軸受であって、
前記転がり軸受を径方向から見たとき、前記外輪軌道溝と前記円環溝とは重ならない、転がり軸受。 As described above, the present specification discloses the following:
(1) A rolling bearing comprising: an outer ring having an outer ring raceway groove formed on its inner peripheral surface and an annular groove for mounting an O-ring on its outer peripheral surface; an inner ring having an inner ring raceway groove formed on its outer peripheral surface; and a plurality of rolling elements disposed between the outer ring raceway groove and the inner ring raceway groove so as to be able to roll,
A rolling bearing, wherein the outer ring raceway groove and the annular groove do not overlap when the rolling bearing is viewed in a radial direction.

この構成によれば、外輪軌道溝の肉厚を減らさずに、即ち、外輪の剛性を低下させることなく、Ｏリング用の円環溝を形成することができ、外輪に作用する応力を低減して負荷容量を大きくすることができる。 With this configuration, it is possible to form an annular groove for the O-ring without reducing the thickness of the outer ring raceway groove, i.e., without reducing the rigidity of the outer ring, thereby reducing the stress acting on the outer ring and increasing the load capacity.

（２） 前記外輪は、前記外輪軌道溝の側方の前記内周面に前記外輪と前記内輪との間の軸受空間を封止する封止部材が装着される封止溝をさらに備え、
前記転がり軸受を径方向から見たとき、前記円環溝と前記封止溝とは重ならない、（１）に記載の転がり軸受。 (2) The outer ring further includes a sealing groove in which a sealing member that seals a bearing space between the outer ring and the inner ring is attached to the inner circumferential surface on a side of the outer ring raceway groove,
The rolling bearing according to (1), wherein the annular groove and the sealing groove do not overlap when the rolling bearing is viewed from a radial direction.

この構成によれば、封止溝の肉厚を減らさずに、即ち、外輪の剛性を低下させることなく、Ｏリング用の円環溝を形成することができる。 With this configuration, it is possible to form an annular groove for an O-ring without reducing the thickness of the sealing groove, i.e., without reducing the rigidity of the outer ring.

（３） 前記円環溝は、前記外輪の軸方向両端部から所定距離内側に隔てた位置に形成されている、（１）又は（２）に記載の転がり軸受。 (3) A rolling bearing as described in (1) or (2), in which the annular groove is formed at a position spaced a predetermined distance inward from both axial ends of the outer ring.

この構成によれば、耐クリープ性の向上と軸受剛性の低下を抑制する効果がある。 This configuration has the effect of improving creep resistance and suppressing a decrease in bearing rigidity.

１０ 玉軸受（転がり軸受）
２０ 外輪
２１ 外輪軌道溝
２２ 内周面
２３ 外周面
２４ 円環溝
２５ 封止溝
３０ 内輪
３１ 内輪軌道溝
３２ 外周面
４０ 玉（転動体）
４２ Ｏリング
４３ スリンガ（封止部材）
Ａ 外輪軌道溝が形成される領域
Ｂ 円環溝が形成される領域
Ｃ 封止溝が形成される領域
Ｓ 軸受空間 10. Ball bearings (rolling bearings)
20 Outer ring 21 Outer ring raceway groove 22 Inner peripheral surface 23 Outer peripheral surface 24 Annular groove 25 Sealing groove 30 Inner ring 31 Inner ring raceway groove 32 Outer peripheral surface 40 Ball (rolling element)
42 O-ring 43 Slinger (sealing member)
A: Region where the outer ring raceway groove is formed; B: Region where the annular groove is formed; C: Region where the sealing groove is formed; S: Bearing space

Claims (3)

内周面に外輪軌道溝が設けられ、外周面にＯリングを装着するための円環溝が設けられた外輪と、外周面に内輪軌道溝が設けられた内輪と、前記外輪軌道溝及び前記内輪軌道溝間に転動自在に配設された複数の転動体と、を備える転がり軸受であって、
前記転がり軸受を径方向から見たとき、前記外輪軌道溝と前記円環溝とは重ならない、転がり軸受。 A rolling bearing comprising: an outer ring having an outer ring raceway groove on its inner peripheral surface and an annular groove for mounting an O-ring on its outer peripheral surface; an inner ring having an inner ring raceway groove on its outer peripheral surface; and a plurality of rolling elements disposed between the outer ring raceway groove and the inner ring raceway groove so as to be able to roll freely,
A rolling bearing, wherein the outer ring raceway groove and the annular groove do not overlap when the rolling bearing is viewed in a radial direction. 前記外輪は、前記外輪軌道溝の側方の前記内周面に前記外輪と前記内輪との間の軸受空間を封止する封止部材が装着される封止溝をさらに備え、
前記転がり軸受を径方向から見たとき、前記円環溝と前記封止溝とは重ならない、請求項１に記載の転がり軸受。 the outer ring further includes a sealing groove in which a sealing member that seals a bearing space between the outer ring and the inner ring is attached to the inner circumferential surface on a side of the outer ring raceway groove,
The rolling bearing according to claim 1 , wherein the annular groove and the sealing groove do not overlap when the rolling bearing is viewed in a radial direction. 前記円環溝は、前記外輪の軸方向両端部から所定距離内側に隔てた位置に形成されている、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, wherein the annular groove is formed at a position spaced a predetermined distance inward from both axial ends of the outer ring.
JP2022201399A 2022-12-16 2022-12-16 Rolling bearings Pending JP2024086328A (en)

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PCT/JP2023/032293 WO2024127741A1 (en) 2022-12-16 2023-09-04 Rolling bearing

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