To obtain a combination seal ring which can hold a magnetic fluid having sufficient density and a volume necessary for securing sealing performance for a long period of time.SOLUTION: Clearances between a slinger 37 and a seal ring 38 constituting a combination seal ring 1a are sealed with a first magnetic fluid seal 39 and a second magnetic fluid seal 40, respectively. The first magnetic fluid seal 39 is formed by holding a first magnetic fluid 60 which is obtained by mixing magnetic powder with a solvent over an entire periphery of a first approximate opposing part 50 by a magnetic force of an annular magnetization part 53, and the second magnetic fluid seal 40 is formed by holding a second magnetic fluid 61 which is obtained by mixing the magnetic powder with the solvent over an entire periphery of a second approximate opposing part 59 by the magnetic force of the annular magnetization part 53. As the solvent constituting the first magnetic fluid 60, there is employed a water-base solvent, and as the solvent constituting the second magnetic fluid 61, there is employed an oil-base solvent.SELECTED DRAWING: Figure 2
【課題】密封性能を確保するのに十分な濃度及び量の磁性流体を、長期間にわたり保持することができる、組み合わせシールリングを実現する。【解決手段】組み合わせシールリング1aを構成するスリンガ37とシールリング38との間部分を、第1の磁性流体シール39及び第2の磁性流体シール40によりそれぞれシールする。第1の磁性流体シール39は、磁性粉末を溶媒に混合してなる第1の磁性流体60を、環状磁化部53の磁力によって、第1の近接対向部50に全周にわたり保持してなり、第2の磁性流体シール40は、磁性粉末を溶媒に混合してなる第2の磁性流体61を、環状磁化部53の磁力によって、第2の近接対向部59に全周にわたり保持してなる。第1の磁性流体60を構成する溶媒として、水系の溶媒を使用し、第2の磁性流体61を構成する溶媒として、油系の溶媒を使用する。【選択図】図2
COMBINATION SEAL RING AND HUB UNIT BEARING
組み合わせシールリング及びハブユニット軸受
2021-05-06
Patent
Electronic Resource
Japanese
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