Patent ID: 6543994
Filing Date: 2003-04-08
Classification: F01D,F02B,F02C,F05D,Y02T

Abstract:
A variable-capacity turbocharger which controls an opening degree of nozzle vanes, comprising:a turbine provided in a housing, said turbine being free to rotate on a turbine shaft; a nozzle unit comprising a plurality of nozzle vanes arranged around said turbine in said housing; a link plate which is provided in said housing and which is freely rotatable around said turbine, said link plate being connected to said nozzle vanes by a plurality of levers and operable to move said nozzle vanes between open and closed positions; and an actuator which is outside of said housing and which is connected to said link plate through a transmission mechanism; wherein said nozzle unit further comprises: a mounting plate fixed to said housing and a side plate provided in a recess in said housing such that said side plate is movable in said recess, said nozzle vanes extending from said mounting plate toward said side plate; a spring plate pushing said side plate toward said mounting plate within said recess and absorbing thermal deformation of said side plate, wherein said recess limits movement of said side plate due to thermal deformation in a radial direction of said turbine while allowing movement of said side plate in an axial direction of said turbine; and a support bolt arranged to limit movement of said side plate toward said mounting plate in a direction parallel to said turbine.