Abstract: An improved driving linkage device for adjusting a variable nozzle mechanism in a supercharger turbine or a variable diffuser mechanism in a compressor. The driving linkage device is provided with a driving ring for driving a variable nozzle mechanism in a supercharger turbine or a variable diffuser mechanism in a compressor, one or more sets of adjusting links, each set consisting of three levers connected in a U-shape and having two opposed ones coupled to the driving ring and a fulcrum for supporting the lever not coupled to the driving ring. One end of one adjusting link is coupled to an actuator to achieve the adjustment of a variable nozzle mechanism in a supercharger or of a variable diffuser mechanism in a compressor.

Abstract: A diffuser device disposed in a passageway between an air outlet of an impeller and a swirl chamber within a casing in a centrifugal compressor, is formed as divided into a diffuser disc capable of being fixed to a casing and a plurality of blades adapted to be arranged along the circumferential direction of the diffuser disc, and the respective diffuser blades have their one ends fitted in fitting bores drilled in the diffuser disc as arrayed along the circumferential direction as many as the diffuser blades so as to be freely rotatable about the axes of the fitting bores, whereby a blade angle is made variable. Also, a method for assembing such a diffuser device in a desired adjusted condition and a ganged drive mechanism for the diffuser blades for bringing the blade angles of the plurality of diffuser blades simultaneously into a desired adjusted condition are disclosed.

Abstract: In an exhaust gas turbine supercharger, a gas inlet casing is formed in a double cylindrical structure that can be divided into separate inner and outer cylindrical casing sections which are slidably fitted to each other in their axial direction, and a turbine nozzle is supported from the inner casing section. This improved structure of the exhaust gas turbine supercharger facilitates dismantling of the turbine nozzle for its cleaning or replacement.