JP4136298B2 - Directional ball bearing - Google Patents

Directional ball bearing Download PDF

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Publication number
JP4136298B2
JP4136298B2 JP2000271681A JP2000271681A JP4136298B2 JP 4136298 B2 JP4136298 B2 JP 4136298B2 JP 2000271681 A JP2000271681 A JP 2000271681A JP 2000271681 A JP2000271681 A JP 2000271681A JP 4136298 B2 JP4136298 B2 JP 4136298B2
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Japan
Prior art keywords
ball
cage
grease
ball bearing
contact portion
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Expired - Fee Related
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JP2000271681A
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Japanese (ja)
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JP2002081450A (en
Inventor
唯久 田中
弘典 岡崎
泰成 戸村
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NTN Corp
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NTN Corp
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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
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/38—Ball cages
    • F16C33/41—Ball cages comb-shaped
    • F16C33/412—Massive or moulded comb cages, e.g. snap ball cages
    • F16C33/414—Massive or moulded comb cages, e.g. snap ball cages formed as one-piece cages, i.e. monoblock comb cages
    • F16C33/416—Massive or moulded comb cages, e.g. snap ball cages formed as one-piece cages, i.e. monoblock comb cages made from plastic, e.g. injection moulded comb cages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/66—Special parts or details in view of lubrication
    • F16C33/6603—Special parts or details in view of lubrication with grease as lubricant
    • F16C33/6629—Details of distribution or circulation inside the bearing, e.g. grooves on the cage or passages in the rolling elements
    • 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

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

Description

【０００１】
【発明の属する技術分野】
この発明は、回転方向が一方向とされる回転部品を回転自在に支持する回転方向性玉軸受に関するものである。
【０００２】
【従来の技術】
自動車エンジンのタイミングベルト用プーリや補機ベルト用プーリを回転自在に支持する玉軸受はエンジンのクランク軸の回転に依存する一方向回転であるため、負荷が比較的小さく、機械部品を支持する一般の玉軸受と異なってフレーキングの発生は殆どなく、軸受寿命はグリース寿命が支配的である。
【０００３】
玉軸受は、普通、外輪と内輪との間に組込まれたボールを保持器で保持し、前記外輪と内輪との間に保持されたグリースをボールの回転によってボールと外・内輪の接触部、およびボールと保持器に形成されたポケットの接触部に取り込んで、各接触部を潤滑するようにしている。
【０００４】
ここで、ボールの転動面と外・内輪の軌道面に形成される潤滑油膜の厚さは、ボールと前記軌道面の接触部入口側に存在するグリースの量に依存し、そのグリース量を多くすることによってボール転動面および外・内輪の軌道面に膜厚の厚い潤滑油膜を形成することができ、軸受寿命の向上を図ることができる。
【０００５】
【発明が解決しようとする課題】
ところで、従来から知られている玉軸受において、保持器が合成樹脂によって形成された玉軸受では、その保持器の強度を確保するため、保持器の外周面および内周面が外輪内周面および内輪外周面に近接する径寸法とされている。このため、外輪内周面と保持器外周面および内輪外周面と保持器内周面に形成される空間が小さく、多くのグリースを保持させることができない。
【０００６】
したがって、ボールと外・内輪の接触部およびボールと保持器におけるポケットの接触部に多くのグリースを取り込むことができず、自動車エンジンのプーリ用玉軸受としての使用において軸受寿命の長寿命化を期待することができない。
【０００７】
特開平１１−１６６５４０号公報には、保持器に形成されたポケットの外径側開口縁および内径側開口縁に面取り部を形成してグリースをポケット内に取り込み易くしているが、前記面取り部が各開口縁の保持器回転方向の前後に設けられているため、ボールの回転によって取り込まれたグリースが排出され易く、グリースの保持力が小さいという不都合がある。
【０００８】
この発明の課題は、回転方向性玉軸受の潤滑性を高め、軸受寿命の長寿命化を図ることである。
【０００９】
【課題を解決するための手段】
上記の課題を解決するために、この発明においては、外輪と、内輪と、その両輪間に組込まれたボール、およびそのボールを保持する保持器とから成り、前記外輪と内輪の一方を回転側軌道輪とし、その回転側軌道輪の回転が一方向回転とされた回転方向性玉軸受において、前記保持器が、円環状の基部に、その基部の軸方向一端面で開口するボール収容用の複数のポケットを円周方向に間隔をおいて形成し、各ポケットの開口部にボールの脱落を防止する一対の爪部を設けた冠形とされ、その冠形保持器の内・外の周面のうち、少なくとも前記回転側軌道輪と対向する側の周面に、前記回転側軌道輪と各ボールの接触部入口側にグリース溜りを形成する軸方向のリブを設け、各軸方向のリブが各ポケットのボール回転方向の先行側の開口縁に設けられた構成を採用したのである。
【００１０】
上記のように構成すれば、回転側軌道輪とボールの接触部入口側に多くのグリースを保持させることができると共に、接触部入口の開口を大きくすることができるため、グリースに対するボールの接触面積が拡大される。
【００１１】
また、回転側軌道輪との接触によってボールが転動し、そのボールの押圧によって保持器が回転した場合に、グリース溜りのグリースはリブによって保持器の回転方向に押されることになり、ボールに対してグリースを良好に接触させることができる。
【００１２】
このため、ボールの回転によってボールと回転側軌道輪の接触部およびボールと保持器ポケットの接触部に多くのグリースを取り込むことができ、ボールの転動面および軌道輪の軌道面に膜厚の厚い潤滑油膜を形成することができ、回転方向性玉軸受の潤滑性を高め、軸受寿命の長寿命化を図ることができる。
【００１３】
ここで、ポケットと、これに隣接するポケット間の一対の爪部間に円周方向のリブを設けることにより、保持器の強度を高めることができる。
【００１４】
また、保持器の外周面および内周面のそれぞれにリブを設け、各リブを各ポケットのボール回転方向の先行側とすることにより、外輪とボールの接触部入口側およびボールと内輪の接触部入口側に多くのグリースを保持させることができ、ボールと外・内輪の接触部およびボールとポケットの接触部により多くのグリースを取り込むことができる。
【００１５】
【発明の実施の形態】
以下、この発明の実施の形態を図面に基づいて説明する。図１（Ｉ）、（II）は、この発明に係る回転方向性玉軸受の第１の実施の形態を示す。玉軸受は、外輪１と、内輪２と、その両輪１、２間に組込まれたボール３およびそのボール３を保持する保持器４から成り、前記外輪１の内周面と内輪２の外周面間に形成された空間の軸方向両端部は外輪１の内周面両端部に取付けられたシール５によって閉塞されている。
【００１６】
上記玉軸受における外輪１は回転側軌道輪とされて図１（Ｉ）の矢印方向にのみ回転されるようになっている。外輪１の回転時、その外輪１との接触によってボール３は矢印方向に回転して外輪１の内周面に形成された軌道面１ａおよび内輪２の外周面に設けられた軌道面２ａに沿って転動し、その転動により保持器４も前記外輪１と同方向に回転する。
【００１７】
保持器４は合成樹脂から成る。この保持器４は、図１（Ｉ）、（II）および図２に示すように、玉軸受のピッチ円径より外径がやや大きい円環状の基部６を有し、その基部６の円周方向に前記ボール３を収容する複数のポケット７が等間隔に形成されている。
【００１８】
ポケット７は基部６の軸方向一端面で開口し、その開口部にボール３の脱落を防止する一対の爪部８が設けられている。隣接するポケット７間の一対の爪部８間には円周方向のリブ９が設けられている。図示の例では、リブ９の外表面と基部６の外周面を同一面としているが、リブ９の外表面が基部６の外周面より低くなるように前記外周面との間で保持器半径方向に段差を設けてもよい。
【００１９】
前記基部６の外周面には、各ボール３と外輪１の接触部入口側にグリース溜り１０を形成する軸方向のリブ１１が設けられている。
【００２０】
このように、基部６の外周面に対するリブ１１の形成によって各ボール３と外輪１の接触部入口側にグリース溜り１０を設けることにより、前記接触部入口側に多くのグリースを保持することができると共に、接触部入口の開口を大きくすることができ、グリース溜り１０に保持されたグリースに対するボールの接触面積の増大を図ることができる。
【００２１】
また、外輪１の回転に伴って保持器４が回転すると、軸方向のリブ１１はグリース溜り１０に保持されたグリースを保持器４の周方向に押すことになり、ボール３とグリースの接触が高められることになる。
【００２２】
このため、ボール３の回転によって、ボール３と外輪１の接触部およびボール３とポケット７の接触部に多くのグリースを取り込むことができ、ボール３の転動面および外・内輪１、２の軌道面１ａ、２ａに膜厚の厚い潤滑油膜を形成することができる。したがって、玉軸受の潤滑性を高め、軸受寿命の長寿命化を図ることができる。
【００２３】
また、隣接するポケット７間の一対の爪部８間に円周方向のリブ９を設けることによって保持器４の強度を高めることができ、耐久性に優れた保持器４を得ることができる。
【００２４】
図３（Ｉ）、（II）は、この発明に係る玉軸受の第２の実施の形態を示す。この第２の実施の形態で示される玉軸受と第１の実施形態で示される玉軸受とは保持器の形状が異なり、内輪２を回転側軌道輪としている点で相違している。
【００２５】
第２の実施形態における内輪２は図３（Ｉ）の矢印方向に回転されるようになっており、その内輪２の回転に伴ってボール３は矢印方向に接触回転し、ボール３を保持する保持器１４は内輪２と同方向に回転するようになっている。
【００２６】
保持器１４は、円環状の基部１５を有し、その基部１５の内径は玉軸受のピッチ円径よりやや小径とされている。基部１５には複数のポケット１６が円周方向に等間隔に形成されている。各ポケット１６は基部１５の軸方向一端面で開口し、その開口部にボール３の脱落を防止する一対の爪部１７が設けられ、隣接するポケット１６間の一対の爪部１７間には円周方向のリブ１８が設けられている。
【００２７】
また、基部１５の内周面には、内輪２と各ボール３の接触部入口側にグリース溜り１９を形成する軸方向のリブ２０が各ポケット１６の保持器回転方向の後行側に設けられている。
【００２８】
上記のように、回転側軌道輪である内輪２とボール３の接触部入口側にグリース溜り１９を設けることにより、前記接触部入口に多くのグリースを保持させることができると共に、接触部入口の開口を大きくすることができ、グリースに対するボールの接触面積の増大を図ることができる。
【００２９】
また、内輪２の回転に伴って保持器１４が回転すると、軸方向のリブ２０はグリース溜り１９内のグリースを保持器１４の回転方向に押すことになり、ボール３とグリースの接触を高めることができる。
【００３０】
このため、ボール３の回転によって、内輪２とボール３の接触部およびボール３とポケット１６の接触部に多くのグリースを取り込むことができ、ボール３の転動面および外・内輪１、２の軌道面１ａ、２ａに膜厚の厚い潤滑油膜を形成することができる。
【００３１】
したがって、玉軸受の潤滑性を高め、回転方向性玉軸受の長寿命化を図ることができる。
【００３２】
図４は、この発明に係る玉軸受の第３の実施の形態を示す。この第３の実施形態で示される玉軸受においては、第１の実施形態で示される玉軸受の保持器４の基部６内径を玉軸受のピッチ円径よりやや小径とし、その基部６の内径面に内輪２とボール３の接触部入口側にグリース溜り２１を形成する軸方向のリブ２２を設けている。
【００３３】
上記のように、内輪２とボール３の接触部入口側にグリース溜り２１を設けることにより、外・内輪１、２の軌道面１ａ、２ａおよびボール３の転動面に膜厚のより厚い潤滑油膜を形成することができ、回転方向性玉軸受の長寿命化をより向上させることができる。
【００３４】
【発明の効果】
以上のように、この発明においては、回転側軌道輪とボールの接触部入口側に多くのグリースを保持させることができるため、軌道輪とボールの接触部およびボールと保持器におけるポケットの接触部に多くのグリースを取り込むことができると共に、軌道輪の軌道面およびボールの転動面に膜厚の厚い潤滑油膜を形成することができる。このため、回転方向性玉軸受の潤滑性を高め、軸受寿命の長寿命化を図ることができる。
【図面の簡単な説明】
【図１】（Ｉ）はこの発明に係る回転方向性玉軸受の第１の実施形態を示す縦断正面図、（II）は縦断側面図
【図２】図１に示す玉軸受の保持器を示す斜視図
【図３】（Ｉ）はこの発明に係る回転方向性玉軸受の第２の実施形態を示す縦断正面図、（II）は縦断側面図
【図４】（Ｉ）はこの発明に係る回転方向性玉軸受の第３の実施形態を示す縦断正面図、（II）は縦断側面図
【符号の説明】
１ 外輪
２ 内輪
３ ボール
４ 保持器
６ 基部
７ ポケット
８ 爪部
９ リブ
１０ グリース溜り
１１ リブ
１４ 保持器
１５ 基部
１６ ポケット
１７ 爪部
１８ リブ
１９ グリース溜り
２０ リブ
２１ グリース溜り
２２ リブ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotationally directional ball bearing that rotatably supports a rotating component whose rotational direction is one direction.
[0002]
[Prior art]
Ball bearings that rotatably support pulleys for timing belts and auxiliary belts of automobile engines are unidirectional rotations that depend on the rotation of the crankshaft of the engine. Unlike ball bearings, there is almost no flaking, and the bearing life is dominated by the grease life.
[0003]
Ball bearings usually hold a ball assembled between an outer ring and an inner ring with a cage, and grease held between the outer ring and the inner ring causes a contact portion between the ball and the outer / inner ring by rotation of the ball. In addition, each contact portion is lubricated by being taken into a contact portion of a pocket formed in the ball and the cage.
[0004]
Here, the thickness of the lubricating oil film formed on the rolling surface of the ball and the raceway surface of the outer / inner ring depends on the amount of grease existing on the entrance side of the contact portion between the ball and the raceway surface. By increasing the number, it is possible to form a thick lubricating oil film on the ball rolling surface and the raceway surfaces of the outer and inner rings, thereby improving the bearing life.
[0005]
[Problems to be solved by the invention]
By the way, in the conventionally known ball bearings, in the ball bearing in which the cage is made of synthetic resin, the outer circumferential surface and the inner circumferential surface of the cage are the outer ring inner circumferential surface and the outer ring in order to ensure the strength of the cage. The diameter is close to the outer peripheral surface of the inner ring. For this reason, the space formed in the outer peripheral surface of the outer ring and the outer peripheral surface of the cage and the outer peripheral surface of the inner ring and the inner peripheral surface of the cage is small, and a large amount of grease cannot be held.
[0006]
Therefore, a large amount of grease cannot be taken into the contact portion between the ball and the outer / inner ring and the contact portion between the ball and the pocket of the cage, and the bearing life is expected to be extended when used as a ball bearing for an automobile engine pulley. Can not do it.
[0007]
In Japanese Patent Laid-Open No. 11-166540, chamfered portions are formed on the outer diameter side opening edge and the inner diameter side opening edge of the pocket formed in the cage so that grease can be easily taken into the pocket. Is provided before and after each opening edge in the cage rotation direction, the grease taken in by the rotation of the ball is easily discharged, and there is a disadvantage that the holding force of the grease is small.
[0008]
An object of the present invention is to improve the lubricity of a rotationally directional ball bearing and to extend the life of the bearing.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention comprises an outer ring, an inner ring, a ball assembled between the two rings, and a cage for holding the ball. In a rotationally directional ball bearing that is a bearing ring and whose rotation side bearing ring rotates in one direction, the cage is formed in an annular base for accommodating a ball that opens at one end surface in the axial direction of the base. formed at intervals a plurality of pockets in a circumferential direction, is a Kanmurigata having a pair of claws to prevent the dropping of the ball into the opening of each pocket, the inner and outer peripheral of the snap cage An axial rib for forming a grease reservoir on the contact side entrance side of the rotating side bearing ring and each ball is provided on at least a peripheral surface of the surface facing the rotating side bearing ring, and each axial direction rib is provided . Is the opening edge of the leading side in the ball rotation direction of each pocket It was adopted provided configuration.
[0010]
If configured as described above, a large amount of grease can be held at the contact portion entrance side of the rotating side race and the ball, and the opening of the contact portion entrance can be increased, so that the contact area of the ball with the grease can be increased. Is enlarged.
[0011]
In addition, when the ball rolls due to contact with the rotating raceway and the cage rotates by pressing the ball, the grease in the grease reservoir is pushed in the direction of rotation of the cage by the rib, On the other hand, the grease can be satisfactorily contacted.
[0012]
Therefore, a large amount of grease can be taken into the contact portion between the ball and the rotating raceway and the contact portion between the ball and the cage pocket by the rotation of the ball. A thick lubricating oil film can be formed, the lubricity of the rotationally directional ball bearing can be improved, and the life of the bearing can be extended.
[0013]
Here, the intensity | strength of a holder | retainer can be raised by providing the circumferential rib between a pair of nail | claw parts between a pocket and the pocket adjacent to this.
[0014]
Also, ribs are provided on each of the outer peripheral surface and inner peripheral surface of the cage, and each rib is set to the leading side of each pocket in the ball rotation direction, so that the outer ring and ball contact portion entrance side and the ball and inner ring contact portion are provided. A large amount of grease can be held on the inlet side, and a large amount of grease can be taken into the contact portion between the ball and the outer / inner ring and the contact portion between the ball and the pocket.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. 1 (I) and (II) show a first embodiment of a rotationally directional ball bearing according to the present invention. The ball bearing is composed of an outer ring 1, an inner ring 2, a ball 3 incorporated between the two wheels 1 and 2, and a cage 4 that holds the ball 3, and the inner peripheral surface of the outer ring 1 and the outer peripheral surface of the inner ring 2. Both ends in the axial direction of the space formed therebetween are closed by seals 5 attached to both ends of the inner peripheral surface of the outer ring 1.
[0016]
The outer ring 1 in the ball bearing is a rotating raceway and is rotated only in the direction of the arrow in FIG. When the outer ring 1 rotates, the ball 3 rotates in the direction of the arrow by contact with the outer ring 1, along the track surface 1 a formed on the inner peripheral surface of the outer ring 1 and the track surface 2 a provided on the outer peripheral surface of the inner ring 2. The cage 4 also rotates in the same direction as the outer ring 1 due to the rolling.
[0017]
The cage 4 is made of a synthetic resin. As shown in FIGS. 1 (I), (II) and FIG. 2, the cage 4 has an annular base 6 whose outer diameter is slightly larger than the pitch diameter of the ball bearing, and the circumference of the base 6 A plurality of pockets 7 for accommodating the balls 3 in the direction are formed at equal intervals.
[0018]
The pocket 7 is opened at one end surface in the axial direction of the base portion 6, and a pair of claw portions 8 for preventing the ball 3 from dropping off is provided in the opening portion. Between the pair of claw portions 8 between the adjacent pockets 7, circumferential ribs 9 are provided. In the illustrated example, the outer surface of the rib 9 and the outer peripheral surface of the base portion 6 are the same surface. However, the outer surface of the rib 9 is lower than the outer peripheral surface of the base portion 6, and the radial direction between the outer peripheral surface and the outer peripheral surface. A step may be provided.
[0019]
An axial rib 11 is provided on the outer peripheral surface of the base portion 6 to form a grease reservoir 10 on the contact portion entrance side of each ball 3 and the outer ring 1.
[0020]
In this manner, by forming the rib 11 on the outer peripheral surface of the base portion 6 and providing the grease reservoir 10 on the contact portion entrance side of each ball 3 and the outer ring 1, a large amount of grease can be held on the contact portion entrance side. At the same time, the opening at the contact portion entrance can be enlarged, and the contact area of the ball with the grease held in the grease reservoir 10 can be increased.
[0021]
Further, when the cage 4 rotates with the rotation of the outer ring 1, the axial rib 11 pushes the grease held in the grease reservoir 10 in the circumferential direction of the cage 4, and the contact between the balls 3 and the grease is made. Will be enhanced.
[0022]
Therefore, a lot of grease can be taken into the contact portion between the ball 3 and the outer ring 1 and the contact portion between the ball 3 and the pocket 7 by the rotation of the ball 3. A thick lubricating oil film can be formed on the raceway surfaces 1a and 2a. Therefore, the lubricity of the ball bearing can be improved and the bearing life can be extended.
[0023]
Moreover, the intensity | strength of the holder | retainer 4 can be raised by providing the circumferential rib 9 between a pair of nail | claw part 8 between the adjacent pockets 7, and the holder | retainer 4 excellent in durability can be obtained.
[0024]
3 (I) and (II) show a second embodiment of the ball bearing according to the present invention. The ball bearing shown in the second embodiment and the ball bearing shown in the first embodiment are different from each other in that the shape of the cage is different and the inner ring 2 is a rotating side race.
[0025]
The inner ring 2 in the second embodiment is rotated in the direction of the arrow in FIG. 3I, and the ball 3 rotates in contact with the direction of the arrow as the inner ring 2 rotates to hold the ball 3. The cage 14 rotates in the same direction as the inner ring 2.
[0026]
The cage 14 has an annular base portion 15, and the inner diameter of the base portion 15 is slightly smaller than the pitch circle diameter of the ball bearing. A plurality of pockets 16 are formed in the base portion 15 at equal intervals in the circumferential direction. Each pocket 16 is opened at one end surface in the axial direction of the base portion 15, and a pair of claw portions 17 for preventing the ball 3 from dropping off is provided in the opening portion, and a circle between a pair of claw portions 17 between adjacent pockets 16 is provided. Circumferential ribs 18 are provided.
[0027]
Further, on the inner peripheral surface of the base portion 15, an axial rib 20 that forms a grease reservoir 19 on the contact portion entrance side of the inner ring 2 and each ball 3 is provided on the downstream side in the cage rotation direction of each pocket 16. ing.
[0028]
As described above, by providing the grease reservoir 19 on the contact portion entrance side of the inner ring 2 and the ball 3 which are the rotating side races, a large amount of grease can be held at the contact portion entrance, and the contact portion entrance The opening can be enlarged, and the contact area of the ball with the grease can be increased.
[0029]
Further, when the cage 14 rotates with the rotation of the inner ring 2, the axial rib 20 pushes the grease in the grease reservoir 19 in the rotation direction of the cage 14, thereby increasing the contact between the balls 3 and the grease. Can do.
[0030]
Therefore, a lot of grease can be taken into the contact portion between the inner ring 2 and the ball 3 and the contact portion between the ball 3 and the pocket 16 by the rotation of the ball 3. A thick lubricating oil film can be formed on the raceway surfaces 1a and 2a.
[0031]
Therefore, the lubricity of the ball bearing can be improved and the life of the rotationally directional ball bearing can be extended.
[0032]
FIG. 4 shows a third embodiment of the ball bearing according to the present invention. In the ball bearing shown in the third embodiment, the inner diameter of the base 6 of the cage 4 of the ball bearing shown in the first embodiment is made slightly smaller than the pitch circle diameter of the ball bearing, and the inner diameter surface of the base 6 Further, an axial rib 22 for forming a grease reservoir 21 is provided on the contact portion entrance side of the inner ring 2 and the ball 3.
[0033]
As described above, by providing the grease reservoir 21 on the contact portion entrance side of the inner ring 2 and the ball 3, the thicker lubrication is provided on the raceway surfaces 1a, 2a of the outer / inner rings 1, 2 and the rolling surface of the ball 3. An oil film can be formed, and the life extension of the rotationally directional ball bearing can be further improved.
[0034]
【The invention's effect】
As described above, in the present invention, since a large amount of grease can be held on the entrance side of the contact portion between the rotating side race and the ball, the contact portion between the race and the ball and the contact portion of the pocket in the ball and the cage In addition, a large amount of grease can be taken in, and a thick lubricating oil film can be formed on the raceway surface of the race and the rolling surface of the ball. For this reason, the lubricity of the rotationally directional ball bearing can be improved and the bearing life can be extended.
[Brief description of the drawings]
FIG. 1 (I) is a longitudinal front view showing a first embodiment of a rotationally directional ball bearing according to the present invention, and (II) is a longitudinal side view. FIG. 2 is a view of the ball bearing retainer shown in FIG. FIG. 3 (I) is a longitudinal front view showing a second embodiment of a rotationally directional ball bearing according to the present invention, (II) is a longitudinal side view [FIG. 4] (I) is according to the present invention. A longitudinal front view showing a third embodiment of such a rotationally directional ball bearing, (II) is a longitudinal side view.
1 outer ring 2 inner ring 3 ball 4 cage 6 base 7 pocket 8 claw 9 rib 10 grease reservoir 11 rib 14 cage 15 base 16 pocket 17 claw 18 rib 19 grease reservoir 20 rib 21 grease reservoir 22 rib

Claims (1)

外輪と、内輪と、その両輪間に組込まれたボール、およびそのボールを保持する保持器とから成り、前記外輪と内輪の一方を回転側軌道輪とし、その回転側軌道輪の回転が一方向回転とされた回転方向性玉軸受において、前記保持器が、円環状の基部に、その基部の軸方向一端面で開口するボール収容用の複数のポケットを円周方向に間隔をおいて形成し、各ポケットの開口部にボールの脱落を防止する一対の爪部を設けた冠形とされ、その冠形保持器の内・外の周面のうち、少なくとも前記回転側軌道輪と対向する側の周面に、前記回転側軌道輪と各ボールの接触部入口側にグリース溜りを形成する軸方向のリブを設け、各軸方向のリブが各ポケットのボール回転方向の先行側の開口縁に設けられた回転方向性玉軸受。It consists of an outer ring, an inner ring, a ball assembled between the two rings, and a cage for holding the ball. One of the outer ring and the inner ring is a rotating raceway, and the rotation of the rotating raceway is unidirectional. In the rotationally directional ball bearing that is rotated, the cage is formed with a plurality of ball receiving pockets that are open at one end surface in the axial direction of the base portion at intervals in the circumferential direction. The crown is provided with a pair of claws for preventing the balls from falling off at the opening of each pocket , and at least the side of the inner and outer peripheral surfaces of the crown-shaped cage that faces the rotating raceway An axial rib for forming a grease reservoir is provided on the contact surface of the rotation side raceway and each ball on the peripheral surface of the ball, and each axial rib is formed at the opening edge of the leading side of each pocket in the ball rotation direction. Provided rotational direction ball bearing.
JP2000271681A 2000-09-07 2000-09-07 Directional ball bearing Expired - Fee Related JP4136298B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000271681A JP4136298B2 (en) 2000-09-07 2000-09-07 Directional ball bearing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000271681A JP4136298B2 (en) 2000-09-07 2000-09-07 Directional ball bearing

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Publication Number Publication Date
JP2002081450A JP2002081450A (en) 2002-03-22
JP4136298B2 true JP4136298B2 (en) 2008-08-20

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Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2911934B1 (en) * 2007-01-26 2009-09-18 Skf Ab CAGE FOR BALL BEARING
JP5030650B2 (en) * 2007-04-11 2012-09-19 Ｎｔｎ株式会社 Rolling bearing
JP5131068B2 (en) * 2008-07-17 2013-01-30 株式会社ジェイテクト Crown type cage
DE102013209288A1 (en) * 2013-05-21 2014-11-27 Schaeffler Technologies Gmbh & Co. Kg Rolling element bearing with cage
DE102013209642A1 (en) * 2013-05-24 2014-11-27 Schaeffler Technologies Gmbh & Co. Kg Rolling bearings with accumulation contour sections
IT202000021943A1 (en) * 2020-09-18 2022-03-18 Skf Ab BEARING CAGE AND BEARING

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