Patent ID: 9091179
Filing Date: 2015-07-28
Classification: F01D,F02B,F05D,Y02T

Abstract:
1. A variable geometry turbine comprising a turbine wheel mounted within a housing for rotation about a turbine axis, a gas flow inlet passage upstream of said turbine wheel, and a gas flow control mechanism located within the housing upstream of said turbine wheel and operable to control gas flow through said gas flow inlet passage, the control mechanism comprising a movable member for varying the size of the gas flow inlet passage, the movable member being movable in a direction substantially parallel to the turbine axis, a transmission mechanism for connection between an actuator and the control mechanism. for converting movement applied by the actuator into movement of the movable member, the transmission mechanism comprising a yoke having a shaft that is rotatably supported in at least one support provided in an inner wall of the housing for rotation about a shaft rotation axis, the yoke defining arms that extend outwardly of the shaft and which engage with the movable member such that rotation of the yoke effects movement of the movable member, wherein there is provided at least one recess defined in an inside surface of the housing, the at least one recess extending away from the at least one support and away from the shaft rotation axis, the at least one recess configured to allow passage of an end of the yoke shaft along it during insertion of the yoke into the housing, wherein the arms each have an end distal from the shaft and rotation of the yoke about its shaft causes the ends to describe an arc of a circle, at least one further recess being defined in the inside surface of the housing proximate one of the arcs.