# US 10,480,576 B2 · Bearing device and exhaust turbine turbocharger

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- Number: US 10,480,576 B2
- Document ID: US10480576B2
- Status: Granted
- Kind: B2
- Application number: 16/078,243
- Filed: 2016-03-01
- Published: 2019-02-14
- Granted: 2019-11-19
- Earliest claimed: 2016-03-01
- Assignees: Mitsubishi Heavy Industries Engine & Turbocharger, Ltd.
- Applicants: Mitsubishi Heavy Industries Engine & Turbocharger, Ltd.
- Inventors: Yuya Kojima; Tatsuya Ishizaki; Yosuke Dammoto; Yoji Akiyama
- Web page: https://patentgrep.com/patent/US10480576B2

## CPC

- F16C 33/1045: {Details of supply of the liquid to the bearing}
- F01M 1/18: Indicating or safety devices (concerning lubricant level F01M11/06, F01M11/12)
- F16C 33/106: {Details of distribution or circulation inside the bearings, e.g. details of the bearing surfaces to affect flow or pressure of the liquid}
- F01D 25/164: {Flexible supports; Vibration damping means associated with the bearing}
- F01D 25/166: {Sliding contact bearing (gas bearings F01D25/22)}
- F01D 25/186: {for sliding contact bearing}
- F01M 2011/0033: {with special means for guiding the return of oil into the sump}
- F01M 2011/021: {for lubricating auxiliaries, e.g. pumps or turbo chargers}
- F05D 2220/40: in turbochargers
- F05D 2250/15: spiral
- F05D 2250/73: asymmetric
- F05D 2260/609: Deoiling or demisting
- F16C 17/02: for radial load only
- F16C 17/18: with floating brasses or brushing, rotatable at a reduced speed {(F16C17/03, F16C17/06 take precedence)}
- F16C 17/26: Systems consisting of a plurality of sliding-contact bearings
- F16C 2360/24: Turbochargers
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F01M: LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS

## Abstract

The present invention improves the drainability of lubricating oil. The present invention comprises: a rotating shaft (14); a journal bearing that is provided to the rotating shaft (14) and rotationally supports the rotating shaft (14); a bearing housing part that houses the journal bearing; and a drain oil space chamber (47) that acts as an oil drainage passage that communicates with the bearing housing part, is provided along the periphery of the rotating shaft (14), and is formed to open downward. Within a region that is in and above a horizontal plane H that passes through the center of the rotating shaft (14), the smallest cross-sectional area of the oil drainage passage in a radial-direction cross-section thereof is on the anterior side in the rotational direction of the rotating shaft (14) with respect to a vertical plane P that passes though the center (O) of the rotating shaft (14), and the largest cross-sectional area of the oil drainage passage in the radial-direction cross-section is on the posterior side in the rotational direction of the rotating shaft (14) with respect to the vertical plane that passes through the center (O) of the rotating shaft (14).

## Claims

### Claim 1

A bearing device comprising:
a rotating shaft;
a journal bearing which is provided on the rotating shaft and rotatably supports the rotating shaft;
a bearing accommodation portion in which the journal bearing is accommodated; and
an oil discharge passage which is provided along a periphery of the rotating shaft on an outer peripheral portion of a boss portion of a turbine disk fixed to the rotating shaft and has an opened lower portion,
wherein the journal bearing is rotatably supported by the bearing accommodation portion using a lubricating oil supplied to a portion between an outer peripheral surface of the journal bearing and an inner surface of the bearing accommodation portion and rotatably supports the rotating shaft by the lubricating oil supplied to a portion between an inner peripheral surface of the journal bearing and an outer peripheral surface of the rotating shaft, and a side surface portion of the journal bearing faces a facing portion of the boss portion with a gap in the bearing accommodation portion,
wherein the lubricating oil reaches the oil discharge passage to communicate with the bearing accommodation portion between the side surface portion of the journal bearing and the facing portion of the boss on the outer peripheral portion of the boss, and in a region above a horizontal plane passing through a center of the rotating shaft, the oil discharge passage has the minimum cross-sectional area in a radial cross section on an anterior side in a rotation direction of the rotating shaft based on a vertical plane passing through the center of the rotating shaft and has the maximum cross-sectional area in the radial cross section on a posterior side in the rotation direction of the rotating shaft based on the vertical plane passing through the center of the rotating shaft,
wherein the oil discharge passage is formed to be continuously enlarging from the minimum cross-sectional area to the maximum cross-sectional area with the vertical plane passing through the center of the rotating shaft as a boundary.

### Claim 2 (depends on 1)

The bearing device according to claim 1,
wherein in the oil discharge passage, a cross-sectional area in the radial cross section is changed in an extension direction of the rotating shaft.

### Claim 3 (depends on 1)

An exhaust turbine turbocharger comprising:
a turbine;
a compressor;
and
the bearing device according to claim 1.