HIGH THRUST TURBOCHARGER ROTOR WITH BALL BEARINGS

摘要

An improved turbocharger for railway locomotive sized enginesincludes, in a preferred embodiment, first and second axially spaced ballbearings supporting a rotor with the first bearing being a hybrid ceramic ballbearing mounted to accept both radial and axial loads acting on the shaft atthecompressor end. The first bearing is mounted on a reduced diameter portionof the shaft, providing reduced bearing diameter to acceptably limitcentrifugalloading of ceramic balls in the bearing against a surrounding bearing race.The first bearing has dual rows of ceramic ball bearings mounted to share allaxial thrust loads on the shaft. The second bearing is also a ball bearing.Lubrication of the bearings is preferably by direct impingement on the innerrace to minimize oil churning causing heating and power loss. Additionalfeatures and advantages are disclosed.