Bearing device for turbocharger
AssigneeIshikawajima-Harima Jukogyo Kabushiki Kaisha
InventorsKazuya Miyashita, Nobuyuki Ikeya
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Abstract
A bearing device for a turbocharger wherein a bearing casing is interposed between a turbine casing and a compressor casing; disposed within a bearing housing of the bearing casing are a ball bearing on the side of the turbine and a ball bearing on the side of the compressor both of which is supported by a one-piece oil film damper which is floating; and a pin is loosely fitted into the oil film damper and the bearing housing so as to prevent the rotation of the oil film damper.
Claims12
A turbocharger comprising:
- a turbine casing, a compressor casing, a bearing casing interposed between said turbine and compressor casings, a turbine ball bearing unit adjacent to said turbine casing, and a compressor ball bearing unit adjacent to said compressor casing, a turbine shaft supported by said bearing units, a one-piece monolithic oil film damper mounted in said bearing casing to be interposed between said bearing casing and said ball bearing units, said oil film damper being spaced from said bearing casing to define a gap with said bearing casing for essentially the entire length of said oil film damper and engaging both of said ball bearing units, means for injecting oil into said gap for floatingly mounting said oil film damper in said bearing casing, and a pin loosely connecting said oil film damper to said bearing casing to prevent rotation of said oil film damper relative to said bearing casing, said pin being received in a slot defined in said oil film damper and in a slot defined in said bearing casing to allow said oil film damper to float with respect to said bearing casing.
A turbocharger according to claim 13 wherein said oil injecting means includes an oil discharge port in communication with an oil outlet of said bearing housing.
A turbocharger according to claim 13 wherein said one-piece oil film damper is provided with at least either a small hole formed for effecting jet lubrication of said ball bearing with part of an oil film formed between said oil film damper and said bearing housing or clearances for subjecting said ball bearings to mist lubrication.
Dependencies are inferred from the claim text.