BEARING STRUCTURE AND TURBOCHARGER

摘要

An oil film damper of a bearing structure is located between facing surfaces of two bearings. The oil film damper includes two protrusions protruding inward in a radial direction from an inner circumferential surface of a main body portion, an oil guiding passage penetrating through from the protrusion to an outer circumferential surface of the main body portion and guiding a lubricating oil from the outer circumference of the main body portion to the bearing, an inclined surface provided on a side opposite to the adjacent surface adjacent to the bearing in the protrusion and having an inner diameter gradually increasing as the diameter is separate from the adjacent surface in the rotation axis direction of the shaft, and an oil discharge hole provided between the two protrusions of the main body portion and discharging the lubricating oil to an outside from an inside of the main body portion.

主权项

1. A bearing structure rotatably supporting a shaft, comprising:
an oil film damper accommodated in a bearing hole formed in a housing and having a cylindrical main body portion; and two bearings held in the main body portion of the oil film damper, the bearings being arranged facing and separated from each other in a rotation axis direction of the shaft, wherein the oil film damper is located between facing surfaces mutually facing each other of the two bearings; and wherein the oil film damper includes: two protrusions protruding inward in a radial direction from an inner circumferential surface of the main body portion and being adjacent to each of the facing surfaces of the two bearings; an oil guiding passage penetrating through from the protrusion to an outer circumferential surface of the main body portion and guiding a lubricating oil from an outer circumference of the main body portion to the bearing; an inclined surface provided on a side opposite to an adjacent surface adjacent to the bearing in the protrusion and having an inner diameter gradually increasing as the diameter is separate from the adjacent surface to a rotation axis direction of the shaft; and an oil discharge hole provided between the two protrusions in the main body portion and discharging the lubricating oil to an outside from an inside of the main body portion.