FLOATING BUSH BEARING DEVICE, AND TURBOCHARGER PROVIDED WITH SAID BEARING DEVICE

• Main Authors: FUTAE, Takaya, HAYASHI, Noriyuki, SUZUKI, Hiroshi, NISHIOKA, Tadasuke, NAMBU, Takashi
• Format: Patent
• Language: English; French; German
• Published: 16.05.2018
• Subjects: BEARINGS; BLASTING; COMBUSTION ENGINES; COMBUSTION ENGINES IN GENERAL; ELEMENTS OR CRANKSHAFT MECHANISMS; ENGINEERING ELEMENTS AND UNITS; FLEXIBLE SHAFTS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; INTERNAL-COMBUSTION PISTON ENGINES; LIGHTING; MECHANICAL ENGINEERING; ROTARY BODIES OTHER THAN GEARING ELEMENTS; SHAFTS; THERMAL INSULATION IN GENERAL; WEAPONS

An object is to provide a floating bush bearing device (130) including a circumferential groove (110) over the entire circumference of an outer peripheral surface of a floating bush while ensuring that a pressing force is applied by lubricant oil to the floating bush to reduce oscillation, as well as a turbocharger provided with the bearing device. A floating bush bearing device includes: a rotary shaft disposed rotatably inside a bearing hole of a casing; a floating bush surrounding the rotary shaft; an oil-feed hole of lubricant oil having an opening on an inner peripheral surface of the bearing hole; a plurality of communication holes formed on the floating bush, each extending between an inner peripheral surface and an outer peripheral surface of the floating bush, and disposed at intervals in a circumferential direction of the floating bush; and a circumferential groove formed on the outer peripheral surface of the floating bush and extending over an entire circumference of the outer peripheral surface of the floating bush, the circumferential groove passing through openings of the plurality of communication holes or facing the openings of the plurality of communication holes. The circumferential groove has a cross-sectional area which varies in accordance with a circumferential position.