THRUST BEARING DEVICE FOR SUPERCHARGER

摘要

A thrust bearing device is constituted by a turbine-side thrust collar and a compressor-side thrust collar that are fixed to a rotary shaft; and a thrust bearing that is arranged between the thrust collars. The thrust bearing is provided with an oil passage that supplies lubricating oil r to sliding-contact surfaces formed between the thrust bearing and the thrust collars. The outsides of the thrust collars in a radial direction incline toward the thrust bearing side. A gap c between the sliding-contact surfaces is narrowed as the gap goes outward in the radial direction, and establishes a basic region gap (c1)>an outer peripheral end gap (c2). The lubricating oil outflow resistance of a radial outer region of the gap c becomes larger than that of a radial inner region. Therefore, the lubricating oil r can be kept from flowing out from a radial outer outlet.