Die-cast diffuser for a turbocharger

摘要

A compressor housing of an exhaust-gas turbocharger is formed as a pressure-die-cast housing to achieve cost reduction in relation to permanent-mold-cast housings. Since it is not possible in a pressure-die-cast housing to realize round transitions of the spiral in the direction of the housing rear side because this would prevent removal from a mold, the bearing-housing-side diffuser wall is formed as a separate component.

主权项

1. An exhaust-gas turbocharger (1) having
a turbine (2), and a compressor (3) which has a metal compressor housing (10) having an inlet, said compressor housing (10) being fastened to a bearing housing (4) and having a compressor spiral (13) having an inner wall (15) on the compressor inlet side and a diffuser wall (14) on the bearing housing side,wherein
the compressor housing (10) is formed as a pressure-die-cast housing, the bearing-housing-side diffuser wall (14) is formed as a separate component connected to the compressor housing (10) and which has an internal rounding (16) in a transition region transitioning to the inner wall (15) of the compressor housing spiral (13), the bearing-housing-side diffuser wall (14) is a plastic injection-molded part, and the plastic injection-molded part has a side facing the bearing housing, wherein the side facing the bearing housing is completely backed by a metal wall (18, 18a) which is a structural component of the compressor housing or a structural component of the bearing housing.