| 摘要 |
A variable-displacement turbine includes a turbine wheel (41), and a turbine housing (12) accommodating a turbine wheel (41) and having an exhaust inlet tubular member (39A) for introducing a stream of exhaust gases from an engine, top and base plates having confronting parallel annular end surfaces, respectively, concentric with the turbine wheel, the top (38) and base plates (36) defining a passage for supplying and guiding the stream of exhaust gases through the exhaust inlet tubular member (39A) to the turbine wheel (41) from its outer periphery, and a vane mechanism disposed annularly in surrounding relation to the turbine wheel (41) and between the annular end surfaces. The vane mechanism includes a plurality of drive shafts (47) rotatably extending through the base plate (36) and disposed at substantially equally spaced angular intervals between the annular end surfaces, the drive shafts (47) being rotatably actuatable by an actuator, and a plurality of movable vanes (45) extending between the annular end surfaces, the movable vanes (45) having base end portions (45A) mounted respectively on the drive shafts (47) in slidable contact with the base plate (36) and wing portions extending respectively from the base end portions and spaced from the base and top plates by distances, the movable vanes (45) being tiltable between the annular end surfaces in response to rotation of the drive shafts (47), respectively, for regulating the stream of exhaust gases. The movable vanes (45) can be tilted unobstructedly even if various members are subjected to thermal strains and/or dimensional errors.
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