Bearing device for turbocharger, and turbocharger

A bearing device for a turbocharger, the bearing device comprising:

• a rotational shaft having one end side and another end side provided with a compressor wheel and a turbine wheel, respectively;
• a journal bearing device including:
• a compressor-side journal bearing rotatably supporting the rotational shaft;
• and
• a turbine-side journal bearing disposed closer to the turbine wheel than the compressor-side journal bearing and rotatably supporting the rotational shaft;
• a bearing housing including:
• a compressor-side bearing supporting portion having on an inner circumference side thereof a supporting surface supporting the compressor-side journal bearing;
• a turbine-side bearing supporting portion having on an inner circumference side thereof a supporting surface supporting the turbine-side journal bearing, the turbine-side bearing supporting portion being disposed to be separated from the compressor-side bearing supporting portion;
• and
• a bearing housing main body inside which the compressor-side bearing supporting portion and the turbine-side bearing supporting portion are supported, the bearing housing main body including:
• an oil supply hole through which lubricant oil is supplied to the journal bearing device;
• an oil discharge port through which the lubricant oil is discharged to the outside;
• and
• a discharge oil space formed between the compressor-side bearing supporting portion and the turbine-side bearing supporting portion;
• and
• a lubricant oil guide member extending along a circumference direction of the rotational shaft, at an outer circumference side of at least one of the compressor-side bearing supporting portion and the turbine-side bearing supporting portion,
• wherein when a virtual line extending vertically downward from a rotational center of the rotational shaft is defined as a reference line in a state where the oil discharge port is orientated downward, the lubricant oil guide member extends from the reference line along the circumference direction toward each of one side and another side of the reference line over a predetermined angle about the rotational center of the rotational shaft.