Mitsubishi Heavy Industries Marine Machinery & Equipment Co., Ltd.

Tetsuya Matsuo

Taiyo Shirakawa

Yasuhiro Wada

Yukihiro Iwasa

Isao Tomita

Hironori Honda

Nao Taniguchi

Fumito Hiratani

Masato Yamashita

Taiji Tezuka

Kenji Yagi

An impeller includes: a disk-shaped hub centered on an axis; and a plurality of blades arranged in a circumferential direction and protruding from a surface of the hub facing one side in a direction of the axis. In a cross-sectional view including a blade height direction which is a direction away from the hub toward a tip of each blade, the blade has a recessed surface curved convexly toward a rear side in a rotational direction. In the cross-sectional view, when a distance between an imaginary line connecting a tip-side edge and a hub-side edge of the blade and a midspan of the blade along a direction perpendicular to the imaginary line is defined as a recess amount, the blade has a portion where the recess amount increases from a leading edge side to a trailing edge side.

Impeller and centrifugal compressor

Provided is a bearing structure that can support a rotary shaft with a small number of components. The bearing structure includes: a cylindrical sleeve () provided so as to surround the outer circumference of a rotary shaft () that rotates about a center axis line (CL) and configured to rotate together with the rotary shaft (); thrust collars () provided so as to abut against both ends in the center axis line (CL) direction of the cylindrical sleeve (), respectively, having a larger diameter than the cylindrical sleeve (), and configured to rotate together with the rotary shaft (); and a compressor-side journal bearing () arranged on the outer circumference side of the cylindrical sleeve () and between the thrust collars ().

Bearing structure, turbocharger having the same, and assembly method of turbocharger

A bearing device includes: a bearing housing; a floating metal having a cylindrical shape and disposed in a housing hole of the bearing housing and in which a rotational shaft is inserted; and a positioning pin for positioning the floating metal with respect to the bearing housing, the positioning pin being disposed along a radial direction of the rotational shaft. The positioning pin includes a first oil supply hole formed so as to penetrate the positioning pin and communicating with a first space between an inner peripheral surface of the floating metal and an outer peripheral surface of the rotational shaft, and a second oil supply hole formed inside the positioning pin so as to connect a second space to the first oil supply hole, the second space being disposed between an outer peripheral surface of the floating metal and an inner peripheral surface of the housing hole.

Bearing device and turbocharger

Growing community of inventors

Nagasaki, Japan

Tetsuya Matsuo