| 摘要 |
An improved bearing assembly is provided for axially retaining journal bearings (14,15) in a turbocharger (10). The turbocharger (10) includes a center housing (24) having an elongated bearing bore (28) for receiving an axially spaced pair of journal bearings (14,15) which in turn support a rotatable turbocharger shaft (12). Lubricating oil is supplied through the center housing (24) for passage to the shaft-bearing interface through radially open oil flow ports (36,37) formed in the journal bearings (14,15). A bearing spacer (42) is interposed axially between the journal bearings (14,15) such that the opposite ends of the bearing spacer (42) define a pair of thrust surfaces (52,54) for engaging and locating the axially inboard faces of the journal bearings (14,15). Additional thrust surfaces are formed on thrust members carried by the turbocharger shaft (12) to engage and locate the axially outboard faces of the journal bearings (14,15). The outer diameters of these thrust surfaces are less than the outer diameter of the journal bearings (14,15) to promote substantially unimpeded, axially bidirectional oil flow over and about the journal bearings (14,15). |
