JP2020183787A - Sealed bearing - Google Patents

Sealed bearing Download PDF

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JP2020183787A
JP2020183787A JP2019088116A JP2019088116A JP2020183787A JP 2020183787 A JP2020183787 A JP 2020183787A JP 2019088116 A JP2019088116 A JP 2019088116A JP 2019088116 A JP2019088116 A JP 2019088116A JP 2020183787 A JP2020183787 A JP 2020183787A
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ring
seal body
inner ring
outer ring
raceway
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巧馬 大西
Takuma Onishi
巧馬 大西
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NTN Corp
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NTN Corp
NTN Toyo Bearing Co Ltd
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  • Sealing Of Bearings (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

To provide a sealed bearing which is suppressed in the deformation of an outer ring and an inner ring, favorable in a bearing assembling property, and held in sealing performance even if an external atmosphere is varied to a vacuum environment from an atmosphere environment.SOLUTION: A sealed bearing comprises: an inner ring 12 and an outer ring 13; a plurality of rolling bodies 14 arranged between the inner ring 12 and the outer ring 13; a cage 15 for holding the plurality of rolling bodies 14 along a peripheral direction; and a seal body 16 arranged in an opening part between the inner ring 12 and the outer ring 13. The seal body 16 is a fiber-made annular body, an annular step part 21 is formed at an edge of a face at a side having a raceway surface of one bearing ring out of the inner ring 12 and the outer ring 13, the seal body 16 is assembled to the step part 21, one end of the seal body 16 is fixed by the step part 21 of one bearing ring and the pressing member 22 by an arrangement of the annular pressing member 22 at an end face of one bearing ring, and the other end of the seal body 16 slidably contacts with a face at a side having a raceway surface of the other bearing ring out of the inner ring 12 and the outer ring 13.SELECTED DRAWING: Figure 1

Description

この発明は、泥や砂など異物混入の恐れのある環境で使用される接触型シールを備えた密封軸受、特に、外部雰囲気が大気環境から真空環境に変動しても使用可能な密封軸受に関する。 The present invention relates to a sealed bearing provided with a contact-type seal used in an environment where foreign matter such as mud or sand may be mixed, and particularly to a sealed bearing that can be used even if the external atmosphere changes from an atmospheric environment to a vacuum environment.

内輪と外輪の間の軸受内空間をシールするシール体を備えた密封軸受としては、特許文献1に示す密封軸受が知られている。この密封軸受1aは、図2に示すように、内輪2及び外輪3に形成したシール溝2a、3aに、両外周縁6bが環状のゴムからなり、外周面が所定のメッシュを有するフィルタ6cから形成された円筒状のシール体6aを配した軸受である。この密封軸受1aは、シール体6aの外周面は所定のメッシュを有するフィルタ6cから構成されている。 As a sealed bearing provided with a sealing body that seals the inner space of the bearing between the inner ring and the outer ring, the sealed bearing shown in Patent Document 1 is known. As shown in FIG. 2, the sealed bearing 1a is formed from a filter 6c in which both outer peripheral edges 6b are made of annular rubber in the sealing grooves 2a and 3a formed in the inner ring 2 and the outer ring 3, and the outer peripheral surface has a predetermined mesh. It is a bearing in which the formed cylindrical seal body 6a is arranged. In the sealed bearing 1a, the outer peripheral surface of the sealing body 6a is composed of a filter 6c having a predetermined mesh.

ところで、シール体6aの外周縁6bは、ゴム製であるので、ゴムの弾性によって内輪と外輪の間の相対変位に対して追随性を有するが、ゴムは低温や高温で分子構造の変化による硬化や脆化、劣化が生じる。このため、外部雰囲気が大気環境から真空環境への変動等、気圧、温度等に大きな変動が生じた場合、シール体6aの劣化が生じ、密封性を保てなくなるおそれが生じる。 By the way, since the outer peripheral edge 6b of the seal body 6a is made of rubber, it has a followability to the relative displacement between the inner ring and the outer ring due to the elasticity of the rubber, but the rubber is cured by the change of the molecular structure at low temperature or high temperature. And embrittlement and deterioration occur. Therefore, if the external atmosphere fluctuates from the atmospheric environment to the vacuum environment, or if the atmospheric pressure, temperature, or the like fluctuates greatly, the sealing body 6a may deteriorate and the sealing property may not be maintained.

これに対し、シール体として、金属等の塑性変形可能な材料を用い、繊維を挟み込んだシールド板を用いることが考えられる。このシールド板は、塑性変形させてシール溝に固定して使用される。 On the other hand, it is conceivable to use a plastically deformable material such as metal as the sealing body and to use a shield plate in which fibers are sandwiched. This shield plate is plastically deformed and fixed to the seal groove for use.

しかし、このシールド板をシール溝に固定するとき、シールド板を塑性変形させるため、シール溝を押し広げようとする力がかかる場合がある。この場合、外輪や内輪が弾性変形し、結果的に軸受の組み込み性が悪化することとなる。 However, when the shield plate is fixed to the seal groove, the shield plate is plastically deformed, so that a force for expanding the seal groove may be applied. In this case, the outer ring and the inner ring are elastically deformed, and as a result, the assembling property of the bearing is deteriorated.

これに対し、特許文献2に記載の密封軸受を用いることが考えられる。この密封軸受1bは、図3(a)に示すように、外輪3に形成した環状溝3bに、繊維から構成される環状のシール体6dを挿入した軸受である。そして、この密封軸受1bのシール体6dの外面に、止め輪7を配し、シール体6dを外輪3に固定する。 On the other hand, it is conceivable to use the sealed bearing described in Patent Document 2. As shown in FIG. 3A, the sealed bearing 1b is a bearing in which an annular sealing body 6d made of fibers is inserted into an annular groove 3b formed in the outer ring 3. Then, a retaining ring 7 is arranged on the outer surface of the seal body 6d of the sealed bearing 1b, and the seal body 6d is fixed to the outer ring 3.

図3(b)に示すようなCリング等の止め輪7を、図3(c)に示すように、外部から内輪2と外輪3の間に挿入し、図3(a)に示すように、外輪3の環状溝3bにはめ込んで使用される。 A retaining ring 7 such as a C ring as shown in FIG. 3 (b) is inserted between the inner ring 2 and the outer ring 3 from the outside as shown in FIG. 3 (c), and as shown in FIG. 3 (a). , It is used by fitting it into the annular groove 3b of the outer ring 3.

特開2002−250354号公報JP-A-2002-250354 特開2017−8964号公報JP-A-2017-8964

しかしながら、止め輪7の高さは、図3(c)に示すように、内輪2と外輪3の間の幅より短い長さとなるため、外輪3の環状溝3bにはめ込んだとき、内輪2側のシール体6dの部分に、止め輪7が配されない部分が生じる。この場合、軸受環境の変動等により、樹脂製のシール体6dにアキシャル方向外側への変形等が生じるおそれがあり、その結果、密封性が低下し、異物が軸受内空間に侵入するおそれがある。 However, as shown in FIG. 3C, the height of the retaining ring 7 is shorter than the width between the inner ring 2 and the outer ring 3, so that when the retaining ring 7 is fitted into the annular groove 3b of the outer ring 3, the inner ring 2 side In the portion of the seal body 6d of the above, there is a portion where the retaining ring 7 is not arranged. In this case, due to fluctuations in the bearing environment or the like, the resin seal body 6d may be deformed outward in the axial direction, and as a result, the sealing property may be deteriorated and foreign matter may enter the space inside the bearing. ..

また、止め輪7としてCリングを使用した場合、Cリングの周方向1箇所に設けられる開口部でも、軸受環境の変動等により、樹脂製のシール体6dにアキシャル方向外側への変形等が生じるおそれがあり、その結果、密封性が低下する可能性がある。 Further, when the C ring is used as the retaining ring 7, the resin seal body 6d is deformed outward in the axial direction due to fluctuations in the bearing environment or the like even at an opening provided at one location in the circumferential direction of the C ring. There is a risk, and as a result, the sealability may be reduced.

そこで、この発明は、外輪や内輪の変形が抑制されて、軸受の組み込み性が良好となり、かつ、外部雰囲気が大気環境から真空環境に変動しても密封性が保持される密封軸受を提供することを目的とする。 Therefore, the present invention provides a sealed bearing in which deformation of the outer ring and the inner ring is suppressed, the bearing can be incorporated well, and the sealing property is maintained even if the external atmosphere changes from the atmospheric environment to the vacuum environment. The purpose is.

前記の課題を解決するために、この発明は、内輪と、前記内輪の径方向外側に配置される外輪と、前記内輪と前記外輪との間に複数配置される転動体と、前記複数の転動体を周方向に沿って保持する保持器と、前記内輪と前記外輪との間の開口部に配置され、軸受内空間を密封するシール体とを備えた密封軸受であって、前記シール体は、繊維製の環状体であり、前記内輪及び前記外輪のうち、一方の軌道輪の軌道面を有する側の面の縁に環状の段部が形成され、この段部に前記シール体が組み入れられ、前記一方の軌道輪の端面に環状の押さえ部材が配されることにより、前記シール体の一端が前記一方の軌道輪の段部と前記押さえ部材により固定され、前記内輪及び前記外輪のうち、他方の軌道輪の軌道面を有する側の面に、前記シール体の他端が摺動自在に接触することを特徴とすることにより、前記の課題を解決しようとするものである。 In order to solve the above-mentioned problems, the present invention comprises an inner ring, an outer ring arranged radially outside the inner ring, a plurality of rolling elements arranged between the inner ring and the outer ring, and the plurality of rolling elements. A sealed bearing including a cage that holds a moving body along the circumferential direction and a sealing body that is arranged in an opening between the inner ring and the outer ring and seals the space inside the bearing. , An annular body made of fiber, and an annular step portion is formed on the edge of the surface of one of the inner ring and the outer ring on the side having the raceway surface, and the seal body is incorporated in this step portion. By arranging an annular pressing member on the end surface of the one raceway ring, one end of the seal body is fixed by the step portion of the one raceway ring and the pressing member, and the inner ring and the outer ring are among the inner ring and the outer ring. An attempt is made to solve the above-mentioned problem by characterized in that the other end of the seal body is slidably contacted with the surface of the other raceway ring on the side having the raceway surface.

また、前記シール体の前記転動体側の面に第1補強部材が配され、前記他方の軌道輪の軌道面を有する側の面と前記第1補強部材との間に隙間を形成してもよい。
さらに、前記シール体の前記転動体側と反対側の面に第2補強部材が配され、前記他方の軌道輪の軌道面を有する側の面と前記第2補強部材との間に隙間を形成してもよい。
Further, even if the first reinforcing member is arranged on the surface of the seal body on the rolling element side and a gap is formed between the surface of the other raceway ring on the side having the raceway surface and the first reinforcing member. Good.
Further, a second reinforcing member is arranged on the surface of the seal body opposite to the rolling element side, and a gap is formed between the surface of the other raceway ring having the raceway surface and the second reinforcing member. You may.

また、本発明の密封軸受は、宇宙空間で使用することができる。 Further, the sealed bearing of the present invention can be used in outer space.

この発明に係る密封軸受は、所定の軌道輪の軌道面の縁に段部を有し、かつ、その軌道輪の端面に環状の押さえ部材が配されるので、シール体をその軌道輪の段部にはめ込む際、力が加わって変形が生じるのを防止でき、軸受の組み込み性が良好となる。
また、シール体の転動体側の面や転動体側と反対側の面に補強部材が配される場合は、これらの補強部材により、繊維製のシール体のアキシャル方向外側への変形が抑制され、外部雰囲気が大気環境から真空環境に変動しても密封性を保持することができる。
The sealed bearing according to the present invention has a step portion on the edge of the raceway surface of a predetermined raceway ring, and an annular pressing member is arranged on the end surface of the raceway ring. When fitting into the portion, it is possible to prevent deformation due to application of force, and the assembling property of the bearing is improved.
Further, when reinforcing members are arranged on the surface of the seal body on the rolling element side or the surface opposite to the rolling element side, these reinforcing members suppress the deformation of the fiber seal body to the outside in the axial direction. Even if the external atmosphere changes from the atmospheric environment to the vacuum environment, the sealing property can be maintained.

さらに、前記の第1補強部材や第2補強部材と、シール体が摺動自在に接触する側の軌道輪の軌道面を有する側の面との間に隙間を形成すると、この面と第1補強部材や第2補強部材との接触や摺動が回避され、異音が発生したり、この面を有する軌道輪が傷ついたりして、軸受としての寿命が短くなるのを防止できる。また、外部雰囲気が大気環境から真空環境に変動したときに、シール体の内側と外側とが、繊維製シール体を介して連通している部分が生じ、空気の行き来が可能となり、シール体のアキシャル方向外側への変形をさらに抑制することができる。 Further, when a gap is formed between the first reinforcing member and the second reinforcing member and the surface of the raceway ring on the side where the seal body is slidably in contact with the raceway surface, the surface and the first surface are formed. Contact or sliding with the reinforcing member or the second reinforcing member can be avoided, and it is possible to prevent abnormal noise from being generated or the raceway ring having this surface being damaged to shorten the life of the bearing. Further, when the external atmosphere changes from the atmospheric environment to the vacuum environment, a portion where the inside and the outside of the seal body are communicated with each other via the fiber seal body is formed, and air can flow in and out of the seal body. The deformation outward in the axial direction can be further suppressed.

(a)この発明にかかる密封軸受の実施形態の例を示す部分縦断面図、(b)(a)の部分拡大断面図。(A) A partial vertical sectional view showing an example of an embodiment of a sealed bearing according to the present invention, and (b) and a partially enlarged sectional view of (a). 従来の密封軸受の例を示す部分縦断面図。Partial longitudinal sectional view showing an example of a conventional sealed bearing. (a)従来の密封軸受の他の例を示す部分縦断面図、(b)(a)で使用される止め輪の例を示す正面図、(c)止め輪をはめこむ途中の状態を示す部分縦断面図。(A) A partial vertical sectional view showing another example of a conventional sealed bearing, (b) a front view showing an example of a retaining ring used in (a), and (c) a state in which the retaining ring is being fitted. Partial vertical cross section.

以下、図面に基づき、本発明の実施形態を説明する。
この発明にかかる密封軸受11は、図1に示すように、内輪12と、その内輪12の径方向外側に配置される外輪13と、内輪12と外輪13との間に複数配置される転動体14と、複数の転動体14を周方向に沿って保持する保持器15と、内輪12と外輪13との間の開口部に配置され、軸受内空間を密封するシール体16とを備えた軸受である。
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the sealed bearing 11 according to the present invention has a plurality of rolling elements arranged between the inner ring 12, the outer ring 13 arranged radially outside the inner ring 12, and the inner ring 12 and the outer ring 13. A bearing including a 14 and a cage 15 that holds a plurality of rolling elements 14 along the circumferential direction, and a seal body 16 that is arranged in an opening between the inner ring 12 and the outer ring 13 and seals the inner space of the bearing. Is.

なお、図1においては、外輪13側でシール体16を固定するが、内輪12側でシール体16を固定してもよい。本明細書においては、外輪13側でシール体16を固定する場合を説明する。なお、内輪12側でシール体16を固定する場合は、シール体16の固定、摺動、機作について、本願明細書の内輪12と外輪13とを入れ替えて解釈する。 In FIG. 1, the seal body 16 is fixed on the outer ring 13 side, but the seal body 16 may be fixed on the inner ring 12 side. In this specification, the case where the seal body 16 is fixed on the outer ring 13 side will be described. When the seal body 16 is fixed on the inner ring 12 side, the fixing, sliding, and mechanism of the seal body 16 are interpreted by exchanging the inner ring 12 and the outer ring 13 in the present specification.

内輪12の外周面及び外輪13の内周面にそれぞれ軌道面が形成されている。内輪12の軌道面及び外輪13の軌道面は、それぞれ径方向の断面形状が円弧状である溝で構成されている。 A raceway surface is formed on the outer peripheral surface of the inner ring 12 and the inner peripheral surface of the outer ring 13, respectively. The raceway surface of the inner ring 12 and the raceway surface of the outer ring 13 are each composed of grooves having an arcuate cross-sectional shape in the radial direction.

これらの軌道面間に形成された環状空間内に、周方向に沿って間隔をおいて転動体14が配される。この転動体14は円弧状の軌道面間に収容される。この実施形態の密封軸受は玉軸受であり、転動体14は球状を成すものであるが、玉軸受以外の軸受においても、この発明を適用できる。例えば、密封軸受として、円筒状の転動体14を用いたころ軸受、あるいは、円錐状の転動体14を用いた円錐ころ軸受であってもよい。この場合、軌道面の形状もその転動体14の種別に対応した形態となる。 Rolling bodies 14 are arranged at intervals along the circumferential direction in the annular space formed between these orbital surfaces. The rolling elements 14 are housed between the arcuate orbital surfaces. The sealed bearing of this embodiment is a ball bearing, and the rolling element 14 has a spherical shape, but the present invention can be applied to bearings other than ball bearings. For example, as the sealed bearing, a roller bearing using a cylindrical rolling element 14 or a conical roller bearing using a conical rolling element 14 may be used. In this case, the shape of the raceway surface also becomes a form corresponding to the type of the rolling element 14.

また、保持器15は、内輪12と外輪13との間に配され、軸方向両側に位置する円環状部と、その円環状部間を結ぶように周方向に沿って所定の間隔をおいて複数配置される柱部とを有している。その隣り合う柱部の間が転動体14を収容するためのポケットである。すなわち、保持器15は、環状体の周壁に複数のポケット穴が等間隔に設けられ、各ポケット穴に転動体14が配される。 Further, the cage 15 is arranged between the inner ring 12 and the outer ring 13, and has a predetermined distance along the circumferential direction so as to connect the annular portions located on both sides in the axial direction and the annular portions. It has a plurality of pillars to be arranged. Between the adjacent pillars is a pocket for accommodating the rolling element 14. That is, in the cage 15, a plurality of pocket holes are provided at equal intervals on the peripheral wall of the annular body, and the rolling elements 14 are arranged in the pocket holes.

内輪12及び外輪13は、マルテンサイト系ステンレス鋼(SUS440C等)等の金属から形成される。 The inner ring 12 and the outer ring 13 are formed of a metal such as martensitic stainless steel (SUS440C or the like).

また、転動体14を構成する材料としては、マルテンサイト系ステンレス鋼(SUS440C等)等の金属やセラミックス材料等をあげることができる。 Further, as the material constituting the rolling element 14, a metal such as martensitic stainless steel (SUS440C or the like), a ceramic material, or the like can be mentioned.

保持器15を構成する材料としては、アルミニウム合金、チタン合金、ステンレス合金、インコネル等の金属、ポリエーテルエーテルケトン(PEEK)、ポリフェニレンサルファイド(PPS)、ポリアミド(PA)等の熱可塑性樹脂等があげられる。また、これらに、ポリテトラフルオロエチレン(PTFE)等のフッ素樹脂等の摺動樹脂を組み合わせて使用してもよい。 Examples of the material constituting the cage 15 include metals such as aluminum alloys, titanium alloys, stainless alloys and inconel, and thermoplastic resins such as polyetheretherketone (PEEK), polyphenylene sulfide (PPS) and polyamide (PA). Be done. Further, a sliding resin such as a fluororesin such as polytetrafluoroethylene (PTFE) may be used in combination with these.

内輪12及び外輪13のうち少なくとも一方の軌道輪、すなわち、図1における外輪13の軌道面を有する側の面13aの縁に、全周に亘って連続する環状の段部21が形成される。そして、この軌道輪(外輪13)の軸方向端面に環状の押さえ部材22が配される。この押さえ部材22を前記軌道輪(外輪13)の軸方向端面に取り付けることにより、段部側面21a、段部底面21b、及び押さえ部材側面22aから固定用溝23が形成される。
この押さえ部材22は、図示しないが、その外方から別部材で押しつけられたり、ネジ等で固定したりすることにより、押さえ部材22は外輪13に固定される。
At least one of the inner ring 12 and the outer ring 13, that is, the edge of the surface 13a on the side of the outer ring 13 having the raceway surface in FIG. 1, is formed with an annular step portion 21 that is continuous over the entire circumference. Then, an annular pressing member 22 is arranged on the axial end surface of the raceway ring (outer ring 13). By attaching the pressing member 22 to the axial end surface of the raceway ring (outer ring 13), a fixing groove 23 is formed from the step portion side surface 21a, the step portion bottom surface 21b, and the pressing member side surface 22a.
Although the pressing member 22 is not shown, the pressing member 22 is fixed to the outer ring 13 by being pressed from the outside by another member or fixed with a screw or the like.

シール体16は、繊維製の環状体であり、段部21に組み入れることができる。段部21にシール体16を組み入れた後、押さえ部材22を取り付けて、固定用溝23を形成させることにより、シール体16の一端縁が固定用溝23により固定される。 The seal body 16 is an annular body made of fiber and can be incorporated into the step portion 21. After incorporating the seal body 16 into the step portion 21, the pressing member 22 is attached to form the fixing groove 23, so that one end edge of the seal body 16 is fixed by the fixing groove 23.

そして、シール体16の他端面は、内輪12及び外輪13のうち他方の軌道輪、すなわち、図1においては、内輪12の軌道面を有する側の面12aに、摺動自在に接触する。 Then, the other end surface of the seal body 16 slidably contacts the other raceway ring of the inner ring 12 and the outer ring 13, that is, the surface 12a on the side of the inner ring 12 having the raceway surface in FIG.

この内輪12の軌道面を有する側の面12aの形状は、特に限定されるものではなく、図1に示すように段部24を有していてもよく、図示しないが、段部を有さなくてもよい。図1に示すように、段部24を有すると、シール体16は、その他端面が段部底部24bと摺動自在に接触するだけでなく、シール体16の転動体側の面の側面の一部が、段部側面24aと摺動自在に接触するので、密封性をより高めることができる。 The shape of the surface 12a on the side of the inner ring 12 having the raceway surface is not particularly limited, and may have a step portion 24 as shown in FIG. 1, and although not shown, it has a step portion. It does not have to be. As shown in FIG. 1, when the seal body 16 has the step portion 24, not only the other end surface of the seal body 16 is slidably contacted with the step portion bottom portion 24b, but also one of the side surfaces of the surface of the seal body 16 on the rolling element side. Since the portion slidably contacts the side surface 24a of the step portion, the sealing performance can be further improved.

シール体16を構成する繊維としては、メタ型全芳香族アラミド繊維等をあげることができる。 Examples of the fibers constituting the seal body 16 include meta-type total aromatic aramid fibers.

このシール体16は、繊維製であるため、通気性は良好だが、得られる密封軸受の使用環境の変動等により、シール体16にアキシャル方向外側への変形等が生じるおそれがある。この変形を防止するため、シール体16の転動体側の面に、第1補強部材16aを配したり、シール体16の転動体側の面と反対側の面に第2補強部材16bを配したりしてもよい。この第1補強部材16aや第2補強部材16bを配することにより、前記の変形等を抑制することができる。 Since the seal body 16 is made of fiber, it has good air permeability, but there is a possibility that the seal body 16 may be deformed outward in the axial direction due to changes in the operating environment of the obtained sealed bearing. In order to prevent this deformation, the first reinforcing member 16a is arranged on the surface of the seal body 16 on the rolling element side, and the second reinforcing member 16b is arranged on the surface of the seal body 16 opposite to the surface on the rolling element side. You may do it. By arranging the first reinforcing member 16a and the second reinforcing member 16b, the above-mentioned deformation and the like can be suppressed.

図1(a)に示すように、固定用溝23に固定されるシール体16の一端縁側に配される第1補強部材16aや第2補強部材16bの端部は、これらと対向する段部側面21aや押さえ部材側面22aと接触することが好ましい。このようにすることにより、固定用溝23から出た部分でシール体16が屈曲し、シール体16に変形が生じるのを防止できる。 As shown in FIG. 1A, the ends of the first reinforcing member 16a and the second reinforcing member 16b arranged on one end edge side of the seal body 16 fixed to the fixing groove 23 are stepped portions facing each other. It is preferable to make contact with the side surface 21a and the side surface 22a of the pressing member. By doing so, it is possible to prevent the seal body 16 from bending at the portion protruding from the fixing groove 23 and causing deformation of the seal body 16.

また、図1(a)(b)に示すように、第1補強部材16a及び第2補強部材16bと内輪12の軌道面を有する側の面12aとの間には、隙間が設けられることが好ましい。具体的には、図1(b)に示すように、第1補強部材16aと面12aとの間に隙間a1が設けられ、第2補強部材16bと面12aとの間に隙間a2が設けられることが好ましい。この隙間a1及びa2を設けることにより、第1補強部材16a及び第2補強部材16bと面12aとの接触や摺動が回避され、異音が発生したり、内輪12が傷ついたりして、軸受としての寿命が短くなるのを防止できる。また、この隙間a1及びa2を設けることにより、軸受内空間と軸受の外部とが、繊維製のシール体16のみで連結する部分が確保されるので、外部雰囲気が大幅に変動しても、空気の移動経路が確保され、シール体16のアキシャル方向への変形が生じるのを防止し、密封性を保持することができる。
なお、隙間a1及びa2の長さは、前記した特徴を保持できる範囲の長さがあればよい。
Further, as shown in FIGS. 1A and 1B, a gap may be provided between the first reinforcing member 16a and the second reinforcing member 16b and the surface 12a on the side of the inner ring 12 having the raceway surface. preferable. Specifically, as shown in FIG. 1B, a gap a1 is provided between the first reinforcing member 16a and the surface 12a, and a gap a2 is provided between the second reinforcing member 16b and the surface 12a. Is preferable. By providing the gaps a1 and a2, contact and sliding between the first reinforcing member 16a and the second reinforcing member 16b and the surface 12a are avoided, abnormal noise is generated, and the inner ring 12 is damaged, resulting in bearings. It is possible to prevent the life of the bearing from being shortened. Further, by providing the gaps a1 and a2, a portion where the space inside the bearing and the outside of the bearing are connected only by the fiber seal body 16 is secured, so that even if the external atmosphere fluctuates significantly, air is provided. The movement path of the seal body 16 is secured, the deformation of the seal body 16 in the axial direction can be prevented, and the sealability can be maintained.
The lengths of the gaps a1 and a2 may be long enough to retain the above-mentioned characteristics.

この発明で製造される密封軸受は、外部雰囲気が大幅に変動しても使用が可能となり、宇宙空間で使用することができる。 The sealed bearing manufactured by the present invention can be used even if the external atmosphere fluctuates significantly, and can be used in outer space.

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。 Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to those of the illustrated embodiments. It is possible to make various modifications and modifications to the illustrated embodiment within the same range as the present invention or within the same range.

1a、1b 密封軸受
2 内輪
3 外輪
2a シール溝
3a シール溝
3b 環状溝
6a シール体
6b 外周縁
6c フィルタ
6d シール体
7 止め輪
11 密封軸受
12 内輪
12a 内輪の軌道面を有する側の面
13 外輪
13a 外輪の軌道面を有する側の面
14 転動体
15 保持器
16 シール体
16a 第1補強部材
16b 第2補強部材
21 段部
21a 段部側面
21b 段部底面
22 押さえ部材
22a 押さえ部材側面
23 固定用溝
24 段部
24a 段部側面
24b 段部底部
a1 隙間
a2 隙間
1a, 1b Sealed bearing 2 Inner ring 3 Outer ring 2a Seal groove 3a Seal groove 3b Circular groove 6a Seal body 6b Outer peripheral edge 6c Filter 6d Seal body 7 Stop ring 11 Sealed bearing 12 Inner ring 12a Surface on the side having the raceway surface of the inner ring 13 Outer ring 13a Surface on the side having the raceway surface of the outer ring 14 Rolling body 15 Cage 16 Seal body 16a First reinforcing member 16b Second reinforcing member 21 Step portion 21a Step portion side surface 21b Step portion bottom surface 22 Pressing member 22a Pressing member side surface 23 Fixing groove 24 Steps 24a Steps Side 24b Steps Bottom a1 Gap a2 Gap

Claims (4)

内輪と、前記内輪の径方向外側に配置される外輪と、前記内輪と前記外輪との間に複数配置される転動体と、前記複数の転動体を周方向に沿って保持する保持器と、前記内輪と前記外輪との間の開口部に配置され、軸受内空間を密封するシール体とを備えた密封軸受であって、
前記シール体は、繊維製の環状体であり、
前記内輪及び前記外輪のうち、一方の軌道輪の軌道面を有する側の面の縁に環状の段部が形成され、この段部に前記シール体が組み入れられ、
前記一方の軌道輪の端面に環状の押さえ部材が配されることにより、前記シール体の一端が前記一方の軌道輪の段部と前記押さえ部材により固定され、
前記内輪及び前記外輪のうち、他方の軌道輪の軌道面を有する側の面に、前記シール体の他端が摺動自在に接触することを特徴とする密封軸受。
An inner ring, an outer ring arranged radially outside the inner ring, a plurality of rolling elements arranged between the inner ring and the outer ring, and a cage for holding the plurality of rolling elements along the circumferential direction. A sealed bearing provided with a sealing body arranged in an opening between the inner ring and the outer ring and sealing the space inside the bearing.
The seal body is an annular body made of fiber.
An annular step portion is formed on the edge of the surface of one of the inner ring and the outer ring on the side having the raceway surface, and the seal body is incorporated in this step portion.
By arranging an annular pressing member on the end surface of the one raceway ring, one end of the seal body is fixed by the step portion of the one raceway ring and the pressing member.
A sealed bearing characterized in that the other end of the seal body slidably contacts the surface of the inner ring and the outer ring on the side of the other raceway ring that has a raceway surface.
前記シール体の前記転動体側の面に第1補強部材が配され、前記他方の軌道輪の軌道面を有する側の面と前記第1補強部材との間に隙間を形成する請求項1に記載の密封軸受。 According to claim 1, a first reinforcing member is arranged on a surface of the seal body on the rolling element side, and a gap is formed between the surface of the other raceway ring on the side having the raceway surface and the first reinforcing member. The sealed bearing described. 前記シール体の前記転動体側の反対側の面に第2補強部材が配され、前記他方の軌道輪の軌道面を有する側の面と前記第2補強部材との間に隙間を形成する請求項2に記載の密封軸受。 A claim in which a second reinforcing member is arranged on a surface of the seal body opposite to the rolling element side, and a gap is formed between the surface of the other raceway ring having the raceway surface and the second reinforcing member. Item 2. The sealed bearing according to item 2. 宇宙空間で使用される請求項1〜3のいずれか1項に記載の密封軸受。 The sealed bearing according to any one of claims 1 to 3, which is used in outer space.
JP2019088116A 2019-05-08 2019-05-08 Sealed bearing Pending JP2020183787A (en)

Priority Applications (1)

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JP2019088116A JP2020183787A (en) 2019-05-08 2019-05-08 Sealed bearing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2019088116A JP2020183787A (en) 2019-05-08 2019-05-08 Sealed bearing

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Publication Number Publication Date
JP2020183787A true JP2020183787A (en) 2020-11-12

Family

ID=73044891

Family Applications (1)

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Country Link
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