Bearing device for turbocharger, and turbocharger

Patent metadata

Field	Value
Publication number	US-10161265-B2
Application number	US-201515546819-A
Country	US
Kind code	B2
Filing date	Sep 10, 2015
Priority date	Sep 10, 2015
Publication date	Dec 25, 2018
Grant date	Dec 25, 2018

Abstract

A bearing device for a turbocharger according to one embodiment of the present invention includes: a rotational shaft; a journal bearing device including a compressor-side journal bearing and a turbine-side journal bearing; a bearing housing including a compressor-side bearing supporting portion, a turbine-side bearing supporting portion, and a bearing housing main body; and a lubricant oil guide member extending along a circumference direction of the rotational shaft, at an outer circumference side of at least one of the compressor-side bearing supporting portion and the turbine-side bearing supporting portion. When a virtual line extending vertically downward from a rotational center CL of the rotational shaft is defined as a reference line VL in a state where an oil discharge port is orientated downward, the lubricant oil guide member extends from the reference line VL along the circumference direction toward each of one side and another side of the reference line VL over a predetermined angle θ about the rotational center CL of the rotational shaft.

First claim

The invention claimed is:

1. A bearing device for a turbocharger, the bearing device comprising:
a rotational shaft having one end side and another end side provided with a compressor wheel and a turbine wheel, respectively;
a journal bearing device including:
a compressor-side journal bearing rotatably supporting the rotational shaft; and
a turbine-side journal bearing disposed closer to the turbine wheel than the compressor-side journal bearing and rotatably supporting the rotational shaft;

a bearing housing including:
a compressor-side bearing supporting portion having on an inner circumference side thereof a supporting surface supporting the compressor-side journal bearing;
a turbine-side bearing supporting portion having on an inner circumference side thereof a supporting surface supporting the turbine-side journal bearing, the turbine-side bearing supporting portion being disposed to be separated from the compressor-side bearing supporting portion; and
a bearing housing main body inside which the compressor-side bearing supporting portion and the turbine-side bearing supporting portion are supported, the bearing housing main body including:
an oil supply hole through which lubricant oil is supplied to the journal bearing device;
an oil discharge port through which the lubricant oil is discharged to the outside; and
a discharge oil space formed between the compressor-side bearing supporting portion and the turbine-side bearing supporting portion; and

a lubricant oil guide member extending along a circumference direction of the rotational shaft, at an outer circumference side of at least one of the compressor-side bearing supporting portion and the turbine-side bearing supporting portion,
wherein when a virtual line extending vertically downward from a rotational center of the rotational shaft is defined as a reference line in a state where the oil discharge port is orientated downward, the lubricant oil guide member extends from the reference line along the circumference direction toward each of one side and another side of the reference line over a predetermined angle about the rotational center of the rotational shaft,
wherein the lubricant oil guide member includes at least one protruding portion protruding from an outer circumference surface of at least one of the compressor-side bearing supporting portion and the turbine-side bearing supporting portion, and
wherein the at least one protruding portion includes:
a first protruding portion; and
a second protruding portion which is formed at a position further separated from the discharge oil space than the first protruding portion and formed to be separated from the first protruding portion.

2. The bearing device for a turbocharger according to claim 1 , wherein the protruding portion is formed, on a side of the discharge oil space, on an end portion of the outer circumference surface of the at least one of the compressor-side bearing supporting portion and the turbine-side bearing supporting portion.

3. The bearing device for a turbocharger according to claim 1 , wherein the protruding portion has a side surface which is, on a side opposite to the discharge oil space, inclined toward the discharge oil space from a base end toward a distal end of the side surface.

4. The bearing device for a turbocharger according to claim 1 , wherein the protruding portion has a side surface which is, on a side of the discharge oil space, inclined toward the discharge oil space from a base end toward a distal end of the side surface.

5. A turbocharger comprising the bearing device for a turbocharger according to claim 1 .

6. A bearing device for a turbocharger, the bearing device comprising:
a rotational shaft having one end side and another end side provided with a compressor wheel and a turbine wheel, respectively;
a journal bearing device including:
a compressor-side journal bearing rotatably supporting the rotational shaft; and
a turbine-side journal bearing disposed closer to the turbine wheel than the compressor-side journal bearing and rotatably supporting the rotational shaft;

a bearing housing including:
a compressor-side bearing supporting portion having on an inner circumference side thereof a supporting surface supporting the compressor-side journal bearing;
a turbine-side bearing supporting portion haying an inner circumference side thereof a supporting surface supporting the turbine-side journal bearing, the turbine-side bearing supporting portion being disposed to be separated from the compressor-side bearing supporting portion; and

a bearing housing main body inside which the compressor-side bearing supporting portion and the turbine-side bearing supporting portion are supported, the bearing housing main body including:
an oil supply hole through which lubricant oil is supplied to the journal bearing device;
an oil discharge port through which the lubricant oil is discharged to the outside; and
a discharge oil space formed between the compressor-side bearing supporting portion and the turbine-side beating supporting portion; and

a lubricant oil guide member extending along a circumference direction of the rotational shaft, at an outer circumference side of at least one of the compressor-side bearing supporting portion and the turbine-side bearing supporting portion,
wherein when a virtual line extending vertically downward from a rotational center of the rotational shaft is defined as a reference line in a state where the oil discharge port is orientated downward, the lubricant oil guide member extends from the reference line along the circumference direction toward each of one side and another side of the reference line over a predetermined angle about the rotational center of the rotational shaft,
wherein the bearing device for a turbocharger further comprising:
a thrust bearing which is disposed closer to the compressor wheel than the compressor-side journal bearing and supports the rotational shaft in a thrust direction; and
an oil deflector including:
a main body portion which is disposed at a position closer to the compressor wheel than the thrust bearing and faces the thrust bearing;
a tongue portion which extends between the compressor-side bearing supporting portion and the oil discharge port from the main body portion toward the compressor wheel; and
a guide portion that extends upwardly from the tongue portion toward the outer circumference surface of the compressor-side bearing supporting portion,

wherein the lubricant oil guide member includes the guide portion.

7. The bearing device for a turbocharger according to claim 6 , wherein the tongue portion includes an opening formed at a position closer to the main body portion than the guide portion.

8. The bearing device for a turbocharger according to claim 6 , wherein a groove portion is formed on the outer circumference surface of the compressor-side bearing supporting portion, and a distal end portion of the guide portion is inserted in the groove portion.

9. The bearing device for a turbocharger according to claim 6 , wherein a protrusion is formed on the outer circumference surface of the compressor-side bearing supporting portion, and the distal end portion of the guide portion comes into contact with a side surface of the protrusion.

10. A turbocharger comprising the bearing device for a turbocharger according to claim 6 .

11. A bearing device for a turbocharger, the bearing device comprising:
a rotational shaft having one end side and another end side provided with a compressor wheel and a turbine wheel respectively;
a journal bearing device including:
a compressor-side journal bearing rotatably supporting the rotationa

Assignees

• Mitsubishi Heavy Ind Engine & Turbocharger Ltd

Inventors

• Isayama Shuichi
• Nambu Takashi
• Futae Takaya
• Kojima Yuya

Classifications

• F01D25/162

  Bearing supports · CPC title

• F16C17/00

  Sliding-contact bearings for exclusively rotary movement (F16C32/06 takes precedence; adjustable bearings F16C23/00, F16C25/00) · CPC title

• F01D25/16

  Arrangement of bearings; Supporting or mounting bearings in casings (bearings per se F16C) · CPC title

• F05D2220/40

  in turbochargers · CPC title

• F04D29/051

  Axial thrust balancing · CPC title