A TURBOMACHINE SHAFT AND JOURNAL BEARING ASSEMBLY

摘要

A turbomachine comprising a turbomachine shaft (4) for rotation about an axis (4a) and for supporting a turbine wheel (5) at one end of the turbomachine shaft; and a bearing housing (3) 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 (26a, 26b) located within the annular clearance. A surface (36a, 36b) 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%.