JP2000337393A5

JP2000337393A5 -

Info

Publication number: JP2000337393A5
Application number: JP1999152028A
Authority: JP
Filing date: 1999-05-31
Publication date: 2006-07-06

Description

上述の様に構成する本発明の転がり軸受のシール構造によれば、玉軸受を構成する複数個の転動体５、５が存在する内部空間１４が、この玉軸受の軸方向両端部に設けた１対のシールリング８、８により外部から密封される。即ち、これら各シールリング８、８の弾性材１０を構成する２本のシールリップ１１ａ、１１ｂのうち、一方のシールリップ１１ａ、１１ａの先端縁を、上記内輪４の外周面両端部に形成した各テーパ面１３、１３に摺接させている。これと共に、上記２本のシールリップ１１ａ、１１ｂのうち、他方のシールリップ１１ｂ、１１ｂの先端縁を、上記内輪４の外周面で、上記一方のシールリップ１１ａ、１１ａが摺接する部分から軸方向内側にずれた部分に、微小隙間を介して近接対向させて、この部分にラビリンスシールを設けている。従って、本発明の場合、上記内部空間１４を、上記２本のシールリップ１１ａ、１１ｂにより、シールリップ１１ａ、１１ｂによる摺動抵抗を大きくする事なく、十分に密封できる。 According to the sealing structure of the rolling bearing of the present invention configured as described above, internal spaces 14 in which a plurality of rolling elements 5 and 5 constituting the ball bearing exist are provided at both ends in the axial direction of the ball bearing. It is sealed from the outside by a pair of sealing rings 8 and 8. That is, of the two seal lips 11a and 11b constituting the elastic material 10 of each of the seal rings 8 and 8, the tip edges of one of the seal lips 11a and 11a are formed on both ends of the outer peripheral surface of the inner ring 4. It is in sliding contact with each of the tapered surfaces 13 and 13. At the same time, of the two seal lips 11a and 11b, the tip edges of the other seal lips 11b and 11b are axially in contact with the outer peripheral surface of the inner ring 4 from the portion where the one seal lips 11a and 11a are in sliding contact with each other. A labyrinth seal is provided in this portion so as to face each other in close proximity to the portion shifted inward through a minute gap. Therefore, in the case of the present invention, the internal space 14 can be sufficiently sealed by the two seal lips 11a and 11b without increasing the sliding resistance due to the seal lips 11a and 11b.