Patent ID: 9169865
Filing Date: 2015-10-27
Classification: F01D,F02B,F02C,F05D,F16C

Abstract:
1. A thrust bearing device for a supercharger comprising: a turbine wheel and a compressor wheel that are fixed to a rotary shaft; a turbine-side thrust collar and a compressor-side thrust collar that are fixed to the rotary shaft and each having a sliding-contact surface; a thrust bearing that is fixed to a bearing housing, has the two thrust collars coming into sliding contact with sliding-contact surfaces at both sides of the thrust bearing in a thrust direction, and receives a thrust load applied to the rotary shaft, an oil passage that is formed in the two thrust collars or the thrust bearing so that lubricating oil is supplied between respective said sliding-contact surfaces in a radial direction, which is an axis-orthogonal direction, formed between the sliding-contact surfaces of the two thrust collars and the sliding-contact surfaces of the thrust bearing; and a gap that forms a lubricating oil film between the respective sliding-contact surfaces in the radial direction, which is the axis-orthogonal direction, wherein the gap where the lubricating oil film is formed is formed so that the lubricating oil outflow resistance of a radial outer region becomes larger than that of a radial inner region, and wherein at least one surface among the sliding-contact surfaces is configured as an incline so as to approach a facing surface as the inclined surface goes outward in the radial direction, and the gap between the sliding-contact surfaces decreases gradually outward in the radial direction.