JPH0619859Y2 - Bearing pressure-resistant sealing device - Google Patents
Bearing pressure-resistant sealing deviceInfo
- Publication number
- JPH0619859Y2 JPH0619859Y2 JP1986046485U JP4648586U JPH0619859Y2 JP H0619859 Y2 JPH0619859 Y2 JP H0619859Y2 JP 1986046485 U JP1986046485 U JP 1986046485U JP 4648586 U JP4648586 U JP 4648586U JP H0619859 Y2 JPH0619859 Y2 JP H0619859Y2
- Authority
- JP
- Japan
- Prior art keywords
- ring
- side wall
- peripheral edge
- wall surface
- inner ring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- 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
- F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
- F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
- F16C33/782—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region
- F16C33/7823—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region of sealing lips
-
- 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
- F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
- F16C33/784—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race
- F16C33/7843—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race with a single annular sealing disc
- F16C33/7853—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race with a single annular sealing disc with one or more sealing lips to contact the inner race
- F16C33/7856—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race with a single annular sealing disc with one or more sealing lips to contact the inner race with a single sealing lip
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
Description
【考案の詳細な説明】 〔産業上の利用分野〕 この考案は、軸受の耐圧式密封装置に関し、さらに詳細
には、軸受内部のグリースの洩れおよび外部からの異物
の侵入を防止するとともに、外部から加えられる圧力
（高圧流体、高圧雰囲気）に対する耐圧性に優れた耐圧
式密封装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a pressure-resistant sealing device for a bearing, and more specifically, to prevent grease from leaking inside the bearing and prevent foreign matter from entering from the outside. The present invention relates to a pressure-resistant sealing device having excellent pressure resistance against a pressure (high-pressure fluid, high-pressure atmosphere) applied from.
ころがり軸受の両側面を実質的に密封して、該軸受の内
部からの油洩れを防止する技術は、従来種々の構造のも
のが開発されており、その代表的なものとして、例え
ば、実公昭４４−１３２１５号公報に開示される密封装
置がある。As a technique for substantially sealing both side surfaces of a rolling bearing to prevent oil leakage from the inside of the bearing, various structures having conventionally been developed have been developed. There is a sealing device disclosed in Japanese Patent No. 44-13215.
この密封装置は、リング状の芯金に弾性材料からなるシ
ール部材を一体化されてなる密封環が、軸受外輪の内周
側の溝部に嵌着されるとともに、該密封環の内周側のリ
ップ部が、軸受内輪に弾力的に摺接されてなる構造とさ
れている。In this sealing device, a sealing ring formed by integrating a ring-shaped core metal with a sealing member made of an elastic material is fitted into a groove portion on the inner peripheral side of a bearing outer ring, and at the inner peripheral side of the sealing ring. The structure is such that the lip portion is elastically brought into sliding contact with the inner ring of the bearing.
しかしながら、従来の密封装置の構造は、本来的に、軸
受内部からの油洩れ防止と、上記リップ部と内輪との接
触によるトルク損失の軽減を主眼として設計されてお
り、これがため、外部圧力に対する耐圧性が十分とはい
えず、特に、軸受の外部圧力が高圧となる環境下（高圧
流体や高圧雰囲気中）での使用には耐え得なかった。However, the structure of the conventional sealing device is originally designed mainly to prevent oil leakage from the inside of the bearing and to reduce torque loss due to contact between the lip portion and the inner ring, and this is why it is against external pressure. It cannot be said that the pressure resistance is sufficient, and in particular, it cannot withstand use in an environment where the external pressure of the bearing is high (in a high pressure fluid or a high pressure atmosphere).
すなわち、従来の密封装置では、軸受の側面に作用する
外部圧力に対する耐久性、つまり耐圧性は0.3〜0.7kgf/
cm2程度に設計されており、これ以上の大きい外部圧力
が作用した場合には、上記リップ部が反転して、シール
効果を損なってしまうという問題があった。That is, in the conventional sealing device, durability against external pressure acting on the side surface of the bearing, that is, pressure resistance is 0.3 to 0.7 kgf /
It is designed to have a size of about cm 2 , and there is a problem in that when a larger external pressure is applied, the lip portion is inverted and the sealing effect is impaired.
また、高圧環境下では、上記リップ部は、外部圧力によ
り内輪の摺接部に過度に押しつけられることとなり、こ
の結果、軸受回転時の摩擦抵抗が増大して、上記リップ
部の摩耗が増長され、これによりシール効果が低減して
しまうとともに、密封装置自体の早期破損を招くといっ
た問題もあった。Further, in a high-pressure environment, the lip portion is excessively pressed against the sliding contact portion of the inner ring by the external pressure, and as a result, the friction resistance at the time of bearing rotation increases, and the wear of the lip portion is increased. However, this causes a problem that the sealing effect is reduced and the sealing device itself is damaged early.
本考案は、かかる従来の問題点に鑑みてなされたもので
あって、外部圧力に対して十分な耐圧性を有し、高圧環
境下での使用に適するとともに、内輪との接触による摩
擦抵抗も小さく、シール効果を長期にわたって安定した
発揮し得る構造を備えた軸受の耐圧式密封装置を提供す
ることを目的とする。The present invention has been made in view of such conventional problems, has sufficient pressure resistance against external pressure, is suitable for use in a high-pressure environment, and has a friction resistance due to contact with an inner ring. An object of the present invention is to provide a pressure resistant sealing device for a bearing, which is small and has a structure capable of stably exhibiting a sealing effect for a long period of time.
上記目的を達成するため、本考案は、 外輪と内輪との間に転動体が介装されるとともに外輪と
内輪との間が密封環によって密封されてなり、内輪と外
周縁部に環状段部が形成されてなる軸受の密封装置にお
いて。In order to achieve the above object, the present invention comprises a rolling element interposed between an outer ring and an inner ring, and a sealing ring between the outer ring and the inner ring to seal the inner ring and the outer peripheral edge with an annular step. In a sealing device for a bearing, which is formed with.
密封環の外周縁部が、外輪に嵌着固定されるとともに、 密封環の内周縁部が、内輪の環状段部に摺接されてな
り、 内輪の環状段部は、内輪外周面より半径方向内側に形成
された円筒状の段部周面と、この段部周面に軸方向内端
から内輪外周面までの半径方向に延びる段部側壁面とか
ら形成され、 密封環は、リング状の芯金に弾性部材からなる弾性リッ
プ部が一体的に固着されてなり、 芯金の内周縁部は、内輪の環状段部内に臨んで設けら
れ、芯金の内周縁部の軸方向内側面が、内輪の段部側壁
面と軸方向に対向するように位置され、 弾性リップ部は、芯金の内周縁部の軸方向内側面に設け
られ、 弾性リップ部は、芯金の内周縁部の軸方向内側面におい
て段部側壁面の径方向幅より大きい径方向の厚みを有す
るとともに、軸方向内側へ突出する断面形状を有し、か
つ、弾性リップ部の軸方向内側先端が内輪の段部側壁面
に摺接され、 弾性リップ部が、芯金の内周縁部から段部側壁面に向か
うにしたがい径方向の厚みが小さくなる断面略三角形状
とされていることを特徴とする軸受の耐圧式密封装置で
ある。The outer peripheral edge portion of the seal ring is fitted and fixed to the outer ring, and the inner peripheral edge portion of the seal ring is slidably contacted with the annular step portion of the inner ring. The inner peripheral surface of the step portion is formed of a cylindrical step portion, and the step peripheral surface is formed of a step side wall surface extending in the radial direction from the inner end in the axial direction to the outer peripheral surface of the inner ring. An elastic lip portion made of an elastic member is integrally fixed to the core metal, and the inner peripheral edge portion of the core metal is provided so as to face the annular step portion of the inner ring. , Located so as to face the stepped side wall surface of the inner ring in the axial direction, the elastic lip portion is provided on the axially inner side surface of the inner peripheral edge portion of the core metal, and the elastic lip portion is disposed on the inner peripheral edge portion of the core metal. The inner side surface in the axial direction has a radial thickness larger than the radial width of the side wall surface of the stepped portion, and protrudes inward in the axial direction The inner diameter of the elastic lip is slidably in contact with the step side wall surface of the inner ring, and the diameter of the elastic lip goes from the inner peripheral edge of the core to the step side wall surface. A pressure-resistant sealing device for a bearing, characterized in that it has a substantially triangular cross-section with a reduced thickness in the direction.
密封環の芯金の内周縁部が、内輪の環状段部内に臨んで
設けられて、その軸方向内側面が環状段部の段部側壁面
と軸方向に対向するように位置されるとともに、この内
周縁部の軸方向内側面に、弾性部材からなる弾性リップ
部が設けられているため、芯金は弾性リップ部側面に作
用する外部圧力に対して、弾性リップ部の保護部材とし
て作用する。The inner peripheral edge portion of the core metal of the sealing ring is provided so as to face the annular step portion of the inner ring, and its axial inner surface is positioned so as to axially oppose the step side wall surface of the annular step portion, Since the elastic lip portion made of an elastic member is provided on the axially inner side surface of the inner peripheral edge portion, the core metal acts as a protection member for the elastic lip portion against external pressure applied to the side surface of the elastic lip portion. .
また、弾性リップ部は、芯金の内周縁部の軸方向内側面
に沿って半径方向に厚みを有し、かつ、軸方向内側に突
出する断面形状を有するため、該リップ部の内周面に作
用する外部圧力に対して、リップ部の付け根が半径方向
に十分な厚みを有することになり、弾性リップ部の外部
圧力に対する十分な剛性が確保される。Further, since the elastic lip portion has a thickness in the radial direction along the axial inner surface of the inner peripheral edge portion of the core metal and has a cross-sectional shape that projects inward in the axial direction, the inner peripheral surface of the lip portion The root of the lip portion has a sufficient thickness in the radial direction with respect to the external pressure acting on the elastic lip portion, and sufficient rigidity of the elastic lip portion against the external pressure is secured.
さらに、内輪の環状段部の段部側壁面に摺接される弾性
リップ部は、芯金の内周縁部から段部側壁面に向かうに
したがい細くなる断面略三角形状とされているため、内
輪の段部側壁面との接触が線接触となり、このシール接
触部の摩擦抵抗の増大が抑制される。Further, since the elastic lip portion slidably contacting the stepped side wall surface of the annular stepped portion of the inner ring has a substantially triangular cross-section that becomes thinner from the inner peripheral edge of the core metal toward the stepped side wall surface, the inner ring is formed. The contact with the side wall surface of the step portion becomes a line contact, and an increase in frictional resistance of the seal contact portion is suppressed.
〔実施例〕 以下、本考案の実施例を図面を参照しながら説明する。[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.
本考案に係る耐圧式密封装置を備えた軸受を第１図およ
び第２図に示し、該軸受１は、外輪２と内輪３の間に、
保持器４に保持される複数個の転動体５，５…が転動可
能に介装されるとともに、上記外輪２と内輪３との間
が、密封環６によって密封されてなる。密封環６は、後
述するように、その外周縁部が外輪２に取り付けられる
とともにその内周縁部が内輪３の環状段部８に摺接する
ようにされている。A bearing provided with a pressure-resistant sealing device according to the present invention is shown in FIGS. 1 and 2, wherein the bearing 1 is provided between an outer ring 2 and an inner ring 3.
A plurality of rolling elements 5, 5 ... Held by a cage 4 are rotatably interposed, and a seal ring 6 seals between the outer ring 2 and the inner ring 3. As will be described later, the sealing ring 6 has an outer peripheral edge portion attached to the outer ring 2 and an inner peripheral edge portion slidably contacting an annular step portion 8 of the inner ring 3.
外輪２の内周縁部には、内周溝７が周方向へ全周にわた
って形成されており、この内周溝７内に上記密封環６の
外周縁部が嵌着固定される。An inner peripheral groove 7 is formed in the inner peripheral edge portion of the outer ring 2 over the entire circumference in the circumferential direction, and the outer peripheral edge portion of the sealing ring 6 is fitted and fixed in the inner peripheral groove 7.
内輪３の外周縁部には、環状段部８が周方向へ全周にわ
たって設けられており、この環状段部８は、円筒状の段
部周面８ａと、この段部周面８ａの軸方向内端から半径
方向外方へ延びる段部側壁面９とから形成されている。
この段部側壁面９は、図示例においては、軸受１の軸線
に対して直角な平面（図面において上下方向の垂直面、
以下軸直角平面と称する）より軸受内部側（軸方向内
側）へ向かってやや勾配を与えた円錐面に形成されてい
る。An annular step portion 8 is provided on the outer peripheral edge of the inner ring 3 over the entire circumference in the circumferential direction. The annular step portion 8 has a cylindrical step portion peripheral surface 8a and an axis of the step portion peripheral surface 8a. It is formed of a step portion side wall surface 9 extending radially outward from the inner end in the direction.
In the illustrated example, the step portion side wall surface 9 is a plane perpendicular to the axis of the bearing 1 (a vertical surface in the vertical direction in the drawing,
It is formed in a conical surface with a slight inclination toward the inner side of the bearing (the inner side in the axial direction) from the plane perpendicular to the axis).
密封環６は、リング状の芯金１０に弾性部材１１が一体
的に固着されている。In the sealing ring 6, an elastic member 11 is integrally fixed to a ring-shaped core metal 10.
芯金１０は、その外周縁部が軸方向内方に屈曲形成され
て短い筒状の外周屈曲部１２とされるとともに、その半
径方向中央部に、軸方向外側へ屈曲された屈曲段部１３
が形成されている。The core metal 10 has an outer peripheral edge portion bent inward in the axial direction to form a short cylindrical outer peripheral bent portion 12, and a bent step portion 13 bent outward in the axial direction at a central portion in the radial direction.
Are formed.
また、芯金１０の内周縁部１４は上記環状段部８内に臨
んで設けられており、その軸方向内側面つまり軸受内部
へ向いた側面が、上記環状段部８の段部側壁面９と軸方
向に対向するように位置されている。Further, the inner peripheral edge portion 14 of the core metal 10 is provided so as to face the inside of the annular step portion 8, and the inner side surface in the axial direction, that is, the side surface facing the inside of the bearing, is the step portion side wall surface 9 of the annular step portion 8. And are axially opposed to each other.
弾性部材１１は、上記芯金１０の外周部分を、その内側
面の一部を除いて覆うように設けられており、芯金１０
の外周屈曲部１２を覆う外周縁部１６と、芯金１０の内
周縁部１４を覆う弾性リップ部１８とを備える。上記外
周縁部１６は、外輪２の内周溝７に嵌着固定されるとと
もに、この嵌着固定状態において、芯金１０の外周屈曲
部１２が、外輪２の内周面より径方向外側に位置するよ
うにされている。これにより、密封環６の外側面に外部
圧力が作用した場合、上記外周屈曲部１２は外輪２の内
周溝７と協働するストッパ部材として機能し、密封環６
の軸受内部へのもぐり込みが有効に防止される。The elastic member 11 is provided so as to cover the outer peripheral portion of the core metal 10 except a part of the inner side surface thereof.
An outer peripheral edge portion 16 that covers the outer peripheral bent portion 12 and an elastic lip portion 18 that covers the inner peripheral edge portion 14 of the core metal 10. The outer peripheral edge portion 16 is fitted and fixed in the inner peripheral groove 7 of the outer ring 2, and in this fitted and fixed state, the outer peripheral bent portion 12 of the core metal 10 is radially outward from the inner peripheral surface of the outer ring 2. It is supposed to be located. As a result, when external pressure acts on the outer surface of the seal ring 6, the outer peripheral bent portion 12 functions as a stopper member that cooperates with the inner peripheral groove 7 of the outer ring 2, and the seal ring 6
It is possible to effectively prevent the bearing from slipping into the bearing.
上記弾性リップ部１８は、芯金１０の内周縁部１４の軸
方向内側面に設けられており、その断面は、図示のよう
に、上記内周縁部１４の軸方向内側面にそって半径方向
に厚みを有するとともに、軸方向内側（軸受の内部に向
いた側）へ突出する形状とされている。また、弾性リッ
プ部１８の先端部１９は、上記環状段部８の段部側壁面
９に摺接されている。The elastic lip portion 18 is provided on the axially inner side surface of the inner peripheral edge portion 14 of the core metal 10, and its cross section has a radial direction along the axial inner side surface of the inner peripheral edge portion 14 as shown in the drawing. Has a thickness and has a shape protruding inward in the axial direction (the side facing the inside of the bearing). Further, the tip end portion 19 of the elastic lip portion 18 is in sliding contact with the step portion side wall surface 9 of the annular step portion 8.
弾性リップ部１８の先端部１９は、その断面が円筒状の
リップ内周面２０と円錐状のリップ外周面２１とからな
る略三角形状とされた、先細の突縁とされている。The tip portion 19 of the elastic lip portion 18 is a tapered projecting edge having a substantially triangular cross-section with a cylindrical lip inner peripheral surface 20 and a conical lip outer peripheral surface 21.
すなわち、密封環６の嵌着状態において、上記リップ内
周面２０は、環状段部８の段部外周面８ａとわずかのす
きまをもって対向する円筒面とされている。このよう
に、弾性リップ部１８の円筒状のリップ内周面２０と段
部外周面８ａとがわずかの隙間を形成することにより、
密封効果を有し、しかも、弾性リップ部１８の先端部１
９への外部圧力の直接の影響を少なくしている。That is, in the fitted state of the seal ring 6, the lip inner peripheral surface 20 is a cylindrical surface facing the step outer peripheral surface 8 a of the annular step 8 with a slight clearance. Thus, by forming a slight gap between the cylindrical lip inner peripheral surface 20 of the elastic lip portion 18 and the step outer peripheral surface 8a,
It has a sealing effect and the tip 1 of the elastic lip 18
It reduces the direct effect of external pressure on 9.
また、上記リップ外周面２１は、軸方向外側つまり軸直
角平面より芯金１０側に向けて勾配を有する円錐面とさ
れている。The lip outer peripheral surface 21 is a conical surface having a gradient toward the core metal 10 side from the axially outer side, that is, the plane perpendicular to the axis.
なお、上記弾性リップ部１８の先端部１９の形状寸法
は、環状段部８の段部側壁面９との接触関係等を考慮し
て設定されるのであるが、好適には、段部側壁面９の傾
斜角度が、軸直角平面に対し軸方向内側へ５〜３０度に
設定されるとともに、この側壁面９に対する上記先端部
１９のリップ外周面２１の傾斜角度（側壁面９とリップ
外周面２１とがなす角度）が、３５〜４５度に設定され
る。The shape and size of the tip end portion 19 of the elastic lip portion 18 is set in consideration of the contact relationship with the step portion side wall surface 9 of the annular step portion 8, but preferably the step portion side wall surface. The inclination angle of 9 is set to 5 to 30 degrees inward in the axial direction with respect to the plane perpendicular to the axis, and the inclination angle of the lip outer peripheral surface 21 of the tip portion 19 with respect to the side wall surface 9 (the side wall surface 9 and the lip outer peripheral surface). The angle formed by 21) is set to 35 to 45 degrees.
また、弾性リップ部１８の厚さが２．５〜３mmに形成さ
れ、さらに弾性リップ部１８のリップ内周面の軸方向の
ほぼ中央部に、環状溝２２が設けられるのが望ましい。Further, it is desirable that the elastic lip portion 18 is formed to have a thickness of 2.5 to 3 mm, and further that the annular groove 22 is provided at a substantially central portion in the axial direction of the lip inner peripheral surface of the elastic lip portion 18.
以上のような構成とすることにより、芯金１０の軸方向
変位が環状溝２２に吸収されて、この軸方向変位の影響
が弾性リップ部１８に直接作用するのを有効に防止する
ことができる。また、弾性リップ部１８の剛性を低下さ
せることなく、リップ部の先端部１９に柔軟性が付与さ
れ、しかも、弾性リップ部１８の軸受内へのまくれこみ
（反転）が防止されるとともに、上記先端部１９と側壁
面９との接触抵抗（摩擦抵抗）の増加防止効果が高めら
れる。With the above configuration, it is possible to effectively prevent the axial displacement of the cored bar 10 from being absorbed by the annular groove 22 and the influence of this axial displacement directly acting on the elastic lip portion 18. . Further, flexibility is imparted to the tip end portion 19 of the lip portion 18 without lowering the rigidity of the elastic lip portion 18, and the elastic lip portion 18 is prevented from bulging (reversing) into the bearing. The effect of preventing an increase in contact resistance (friction resistance) between the tip portion 19 and the side wall surface 9 is enhanced.
以上詳述したように、本考案によれば、以下に列挙する
ような種々のすぐれた効果が得られ、軸受の外部圧力が
高圧となる環境下での使用にも十分耐え得る耐圧式密封
装置を提供することができるものである。As described above in detail, according to the present invention, various excellent effects as listed below can be obtained, and the pressure resistant sealing device can sufficiently withstand use in an environment where the external pressure of the bearing is high. Can be provided.
(1)密封環の芯金の内周縁部が、内輪の環状段部内に臨
んで設けられて、その軸方向内側面が環状段部の段部側
壁面と軸方向に対向するように位置されるとともに、こ
の内周縁部の軸方向内側面に、弾性部材からなる弾性リ
ップ部が設けられているため、芯金が弾性リップ部側面
に対する外部圧力の保護部材として作用する。(1) The inner peripheral edge portion of the core metal of the sealing ring is provided so as to face the annular step portion of the inner ring, and its axial inner surface is positioned so as to axially face the step sidewall surface of the annular step portion. In addition, since the elastic lip portion made of an elastic member is provided on the axially inner side surface of the inner peripheral edge portion, the core metal acts as a member for protecting the side surface of the elastic lip portion against external pressure.
したがって、弾性リップ部は、その側面に対する外部圧
力の直接的な影響はもちろんのこと、間接的な影響もほ
とんど受けることがない。Therefore, the elastic lip portion is hardly affected not only by the direct influence of the external pressure on its side surface but also by the indirect influence.
(2)弾性リップ部は、芯金の内周縁部の軸方向内側面に
沿って半径方向に厚みを有し、かつ、軸方向内側へ突出
する断面形状を有するため、リップ部のリップ内周面に
作用する外部圧力に対して、リップ部の付け根が半径方
向に十分な厚みを有することになり、弾性リップ部の外
部圧力に対する十分な剛性が確保され、この点でも外部
圧力に対する十分な耐圧性を発揮することができる。(2) Since the elastic lip portion has a thickness in the radial direction along the axial inner side surface of the inner peripheral edge portion of the core metal and has a cross-sectional shape that projects inward in the axial direction, the lip inner circumference of the lip portion With respect to the external pressure acting on the surface, the root of the lip has a sufficient thickness in the radial direction, and the elastic lip has sufficient rigidity against the external pressure. You can exercise your sexuality.
したがって、外部圧力によるシール部の反転を有効に防
止でき、常時安定したシール効果を発揮することができ
る。Therefore, it is possible to effectively prevent the inversion of the seal portion due to the external pressure, and it is possible to exert a stable sealing effect at all times.
(3)内輪の環状段部の段部側壁面に摺接される弾性リッ
プ部は、芯金の内周縁部から段部側壁面に向かうにした
がい径方向の厚みが小さくなる断面略三角形状とされて
いるため、内輪の段部側壁面との接触が線接触となる。(3) The elastic lip portion that is in sliding contact with the step side wall surface of the annular step portion of the inner ring has a substantially triangular cross-section in which the radial thickness decreases from the inner peripheral edge of the core metal toward the step side wall surface. Therefore, the contact with the step side wall surface of the inner ring becomes a line contact.
したがって、弾性リップの先端部と上記環状段部の側壁
面との接触部における摩擦抵抗の増大が抑制され、しか
も弾性リップの先端部に十分な柔軟性をもたせることが
できるので、外部圧力が大きくなっても摩擦抵抗が大き
くなることがない。これにより、弾性リップ部の摩耗が
低減されて、シール効果が長期にわたって安定して維持
でき、密封装置自体の寿命が大幅に延びる。Therefore, it is possible to suppress an increase in frictional resistance at the contact portion between the tip portion of the elastic lip and the side wall surface of the annular step portion, and further, since the tip portion of the elastic lip can have sufficient flexibility, the external pressure is large. Even if it becomes, the frictional resistance does not increase. As a result, wear of the elastic lip portion is reduced, the sealing effect can be stably maintained for a long period of time, and the life of the sealing device itself is significantly extended.
図面は本考案の実施例を示したものであって、第１図は
耐圧式密封装置を備える軸受の一半部の縦断面図、第２
図は同軸受から密封環を分離した状態の第１図に対応す
る縦断面図である。 １……軸受、２……外輪、３……内輪、６……密封環、
７……内周溝、８……環状段部、８ａ……段部周面、９
……段部側壁面、１０……芯金、１１……弾性部材、１
４……芯金の内周縁部、１８……弾性リップ部、１９…
…弾性リップ部の先端部、２０……リップ内周面、２１
……リップ外周面、２２……環状溝FIG. 1 shows an embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view of one half of a bearing provided with a pressure-resistant sealing device, and FIG.
The figure is a longitudinal sectional view corresponding to FIG. 1 in a state in which a seal ring is separated from the bearing. 1 ... Bearing, 2 ... Outer ring, 3 ... Inner ring, 6 ... Seal ring,
7 ... inner peripheral groove, 8 ... annular step, 8a ... step peripheral surface, 9
...... Step side wall surface, 10 ...... core metal, 11 …… elastic member, 1
4 ... Inner peripheral edge of core metal, 18 ... Elastic lip portion, 19 ...
... Tip of elastic lip, 20 ... Inner peripheral surface of lip, 21
... Lip outer surface, 22 ... annular groove
Claims (4)
ともに外輪と内輪との間が密封環によって密封されてな
り、内輪の外周縁部に環状段部が形成されてなる軸受の
密封装置において、 密封環の外周縁部が、外輪に嵌着固定されるとともに、 密封環の内周縁部が、内輪の環状段部に摺接されてな
り、 内輪の環状段部は、内輪外周面より半径方向内側に形成
された円筒状の段部周面と、この段部周面の軸方向内端
から内輪外周面まで半径方向に延びる段部側壁面とから
形成され、 密封環は、リング状の芯金に弾性部材からなる弾性リッ
プ部が一体的に固着されてなり、 芯金の内周縁部は、内輪の環状段部内に臨んで設けら
れ、芯金の内周縁部の軸方向内側面が、内輪の段部側壁
面と軸方向に対向するように位置され、 弾性リップ部は、芯金の内周縁部の軸方向内側面に設け
られ、 芯金の内周縁部の軸方向内側面において段部側壁面の径
方向幅より大きい径方向の厚みを有するとともに、軸方
向内側へ突出する断面形状を有し、かつ、弾性リップ部
の軸方向内側先端が内輪の段部側壁面に摺接されるとと
もに、 芯金の内周縁部から段部側壁面に向かうにしたがい径方
向の厚みが小さくなる段面略三角形状とされていること
を特徴とする軸受の耐圧式密封装置。1. A bearing in which a rolling element is interposed between an outer ring and an inner ring, a seal ring is sealed between the outer ring and the inner ring, and an annular step portion is formed at an outer peripheral edge portion of the inner ring. In the sealing device, the outer peripheral edge portion of the seal ring is fitted and fixed to the outer ring, and the inner peripheral edge portion of the seal ring is slidably contacted with the annular step portion of the inner ring. It is composed of a cylindrical step portion peripheral surface formed radially inward of the outer peripheral surface and a step portion side wall surface extending radially from the axial inner end of the step portion peripheral surface to the inner ring outer peripheral surface. , An elastic lip portion made of an elastic member is integrally fixed to a ring-shaped core metal, and the inner peripheral edge portion of the core metal is provided so as to face the annular step portion of the inner ring, and the shaft of the inner peripheral edge portion of the core metal is provided. The inner side surface in the direction is axially opposed to the step side wall surface of the inner ring, and the elastic lip portion A cross section that is provided on the axially inner side surface of the inner peripheral edge portion of the core, has a radial thickness larger than the radial width of the stepped side wall surface on the axial inner side surface of the inner peripheral edge portion of the core metal, and projects inward in the axial direction It has a shape, and the axially inner tip of the elastic lip is slidably contacted to the step side wall surface of the inner ring, and the radial thickness becomes smaller as it goes from the inner peripheral edge of the core metal to the step side wall surface. A pressure-resistant sealing device for a bearing, wherein the stepped surface has a substantially triangular shape.
向内側へ向かって勾配を有する円すい面である実用新案
登録請求の範囲第１項記載の軸受の耐圧式密封装置。2. The pressure-resistant sealing device for a bearing according to claim 1, wherein the stepped side wall surface of the inner ring is a conical surface having a slope inward from the plane perpendicular to the axis in the axial direction.
面に対し軸方向内側へ５〜３０度に設定され、 該段部側壁面に対する前記弾性リップ部の先端部のリッ
プ外周面の傾斜角度は、３５〜４５度に設定されている
実用新案登録請求の範囲第２項記載の軸受の耐圧式密封
装置。3. The inclination angle of the stepped side wall surface of the inner ring is set to 5 to 30 degrees inward in the axial direction with respect to the plane perpendicular to the axis, and the lip outer peripheral surface of the tip end portion of the elastic lip portion with respect to the stepped side wall surface. The pressure-resistant sealing device for a bearing according to claim 2, wherein the inclination angle is set to 35 to 45 degrees.
中央部に、環状溝が設けられている実用新案登録請求の
範囲第２項記載の軸受の耐圧式密封装置。4. The pressure-resistant sealing device for a bearing according to claim 2, wherein an annular groove is provided substantially axially at the center of the inner peripheral surface of the elastic lip portion in the axial direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986046485U JPH0619859Y2 (en) | 1986-03-28 | 1986-03-28 | Bearing pressure-resistant sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986046485U JPH0619859Y2 (en) | 1986-03-28 | 1986-03-28 | Bearing pressure-resistant sealing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62158221U JPS62158221U (en) | 1987-10-07 |
| JPH0619859Y2 true JPH0619859Y2 (en) | 1994-05-25 |
Family
ID=30866190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1986046485U Expired - Lifetime JPH0619859Y2 (en) | 1986-03-28 | 1986-03-28 | Bearing pressure-resistant sealing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0619859Y2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5834281B2 (en) * | 2011-07-27 | 2015-12-16 | イマデスト株式会社 | Sealed rolling bearing |
| WO2020067119A1 (en) * | 2018-09-26 | 2020-04-02 | Ntn株式会社 | Ball bearing with pressure-resistant seal |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5840621U (en) * | 1981-09-11 | 1983-03-17 | 日本精工株式会社 | Sealing device for inner ring rotating bearings |
-
1986
- 1986-03-28 JP JP1986046485U patent/JPH0619859Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62158221U (en) | 1987-10-07 |
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