Patent ID: 6135643
Filing Date: 2000-10-24
Classification: B60B,F16C

Abstract:
A hub unit bearing assembly which comprises:a hub having one end portion formed with an inner race mount for mounting a first inner race with a first inner raceway defined therein, said hub including,a second inner raceway defined at a portion of the hub on one side of the inner race mount opposite to such one end portion of the hub, anda flange which is securable to a vehicle wheel; anda dual tapered roller bearing including,the first inner race, the first inner race being fixedly mounted on the inner race mount in the hub,a common outer race having a fire defined therein so as to extend radially outwardly,first and second cages made from synthetic resin, each cage having a plurality of pockets defined therein,first and second circumferential rows of rollers retained within the pockets in the first and second cages, respectively, anda first and a second ring-shaped seal, whereinthe first circumferential row of rollers are rollingly positioned between the common outer race and the first inner raceway,the second circumferential row of rollers are rollingly positioned between the common outer race and the second inner raceway,the first and second seals are positioned inside of and adjacent to respective opposite ends of the common outer race with the first seal being mounted between the common outer race and the first inner race and the second seal being mounted between the common outer race and the hub,said inner race has a reduced-diameter end and a large-diameter end opposite to said reduced-diameter end,said reduced-diameter end of said inner race being, when the inner race is mounted on the inner race mount in the hub, positioned immediately next to the second inner raceway, at least said large-diameter end of said inner race being formed with a collar for axially positioning the rollers,at least the second cage is capable of retaining said second circumferential row of rollers in a non-detachable fashion prior to being incorporated in the bearing assembly,said first and second rows of rollers being, after having been mounted in the associated pockets in the first and second cages, inserted in between the first inner raceway and the common outer race and between the second inner raceway and the common outer race, respectively, andsaid second seal is adjacent to the flange of the hub and is assembled with the common outer race prior to assemblage of the hub with the common outer race.