Bearing structure for turbochargers

DE112019004994B4Active Publication Date: 2026-07-02IHI CORP
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Patent Information

Authority / Receiving Office
DE · DE
Patent Type
Patents
Current Assignee / Owner
IHI CORP
Filing Date
2019-08-09
Publication Date
2026-07-02

AI Technical Summary

Technical Problem

Exhaust gas leaks through the clearance between the shaft and the bearing member due to reduced urging force of the spring member caused by high temperatures, which is a common issue in turbine housings where exhaust gas temperatures exceed 500°C.

Method used

A bearing structure is designed with a rotary member having radial extension portions and a bearing member with mating surfaces arranged in the axial direction, allowing the bearing member to move axially while being restricted, forming a longer flow path for exhaust gas to prevent leakage.

Benefits of technology

The design effectively prevents exhaust gas leakage by increasing pressure loss and reducing the amount of gas that escapes from the interior to the exterior, while also minimizing wear and noise by allowing the bearing member to float and adjust to pressure changes.

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Abstract

Bearing structure (200) comprising: a rotary component (RMb) having a shaft section (137a, 137e) and a plurality of extension sections (39c, 137b, 137d) extending radially outward from the shaft section (137a, 137e) and separated from one another in an axial direction of the shaft section (137a, 137e); a large-diameter section (137c) having a diameter larger than the diameter of the shaft section (137a, 137e), and having extension sections (39c, 137b, 137d) on each of the sides in the axial direction, the large-diameter section (137c) being enclosed in the rotary component (RMb);a bearing component (145) comprising a plurality of main bodies (145a, 145b) through which the shaft section (137a, 137e) is inserted, wherein the plurality of main bodies (145a, 145b) is arranged on each of the one side and the other side in the axial direction with respect to the large diameter section (137c), wherein the plurality of main bodies (145a, 145b) has a plurality of counter surfaces (45da, 45e, 45e) facing the plurality of extension sections (39c, 137b, 137d) in the axial direction;and a turbine housing (5) in which a through-hole (5b) is formed, wherein the bearing component (145) is arranged in the through-hole (5b), wherein the bearing component (145) has a pair of counter surfaces (45e, 45e) arranged such that they face each other in the axial direction, and the plurality of main bodies (145a, 145b) includes a first main body (145b) which floats in the through-hole (5b), wherein the first main body (145b) has a first flange (45d) which faces a curved inner surface of the turbine housing (5) in the axial direction.
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