Variable-volume turbocharger
AssigneeMitsubishi Jidosha Kogya Kabushiki Kaisha
InventorsNorio Nakazawa, Yoshimasa Matsura, Tetsuo Takemoto, Susumu Kohketsu
Life of this patent
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Abstract
A variable-volume turbocharger device comprises at least two exhaust gas passages (A), (B) different in the flow characteristics, divided by a partition wall (20) provided in a turbine housing (18), and two valve members (34a), (34b) which are actuated so as to open and shut the exhaust gas passages (A), (B). The valve members (34a), (34b) each are actuated to open and shut in response to the speed and load of an engine or the likes, whereby either one of the exhaust gas passages (A), (B) or both of them are opened to provide at least three turbine flow characteristics. An exhaust gas turbine (12) can be thereby operated with remarkably good efficiency suitably to the operating state of the engine.
Claims12
A variable-volume turbocharger device comprising a turbine housing having at least first and second exhaust gas passages divided by a partition wall provided in the housing, said first exhaust gas passage having a large flow characteristic and said second exhaust gas pasage having a small flow characteristic, a first valve means operable to open and shut said first exhaust gas passage, and a second valve means operative to open and shut said second exhaust gas passage independently from said first valve means, each of said valve means having a valve member which cooperates with a valve seat to open and shut the corresponding exhaust gas passage, said valve members being arranged so as to open toward the upstream side of the flowing direction of exhaust gas with respect to said valve seats.
Dependencies are inferred from the claim text.