Patent ID: 8628247
Filing Date: 2014-01-14
Classification: F01D,F05D,F16C

Abstract:
1. A bearing structure of a turbocharger, comprising: a rotor shaft; a bearing housing in which a bearing hole is formed; and a bearing member of a semi-floating type, formed in a generally cylindrical shape, arranged in the bearing hole and supporting the rotor shaft in a rotatable state, wherein the bearing member has a first bearing portion and a second bearing portion spaced at a predetermined interval in an axial direction of the rotor shaft, in an inner periphery thereof, wherein a region between the first bearing portion and the second bearing portion in the inner periphery of the bearing member, and an outer periphery of the rotor shaft constitute an oil passage for supply of lubricant oil to inside surfaces of the first and second bearing portions, wherein a through hole for supply of the lubricant oil to the oil passage is formed in the bearing member, and wherein an oil groove configured to suppress whirl vibration and closed in part is formed in each of the inside surfaces of the first and second bearing portions, wherein a first end of each of the oil grooves is open at the oil passage and an opposite second end of each of the oil grooves is closed, so that a length of each of the oil grooves, respectively, is less than a length of the inside surfaces of the first and second bearing portions, respectively, as measured along the axial direction of the rotor shaft.