A turbomachine shaft and journal bearing assembly
AssigneeCummins Inc.
InventorsMichael Burkinshaw, Craig Lancaster, Jason Maxim Hall
Life of this patent
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Abstract
A turbomachine comprising a turbomachine shaft for rotation about an axis and for supporting a turbine wheel at one end of the turbomachine shaft; and a bearing housing having a wall defining a bore in which the turbomachine shaft is received with a substantially annular clearance, the turbomachine shaft being supported for rotation in the bore by at least one journal bearing located within the annular clearance. A surface of the turbomachine shaft which radially underlies the or each journal bearing has a surface roughness (Ra) of less than 0.15 microns and the or each journal bearing comprises a bronze alloy incorporating bismuth in an amount of up to around 6 wt %.
Claims15
A turbomachine comprising:
- a turbomachine shaft for rotation about an axis and for supporting a turbine wheel at one end of the turbomachine shaft;
- and
- a bearing housing defining a bore in which the turbomachine shaft is received with a substantially annular clearance, the turbomachine shaft being supported for rotation in the bore by at least one journal bearing located within the annular clearance;
- wherein a surface of the turbomachine shaft which radially underlies the or each journal bearing has a surface roughness (Ra) of less than 0.15 microns and the or each journal bearing comprises a bronze alloy incorporating bismuth in an amount of up to around 6 wt %.
A shaft and journal bearing assembly comprising:
- a shaft for rotation about an axis;
- and
- at least one journal bearing to be mounted on the shaft;
- wherein a surface of the shaft which will radially underlie the or each journal bearing when mounted on the shaft has a surface roughness (Ra) of less than 0.15 microns and the or each journal bearing comprises a bronze alloy incorporating bismuth in an amount of up to around 6 wt %.
Dependencies are inferred from the claim text.