公开(公告)号：US20170234211A1

公开(公告)日：2017-08-17

申请号：US15422603

申请日：2017-02-02

Applicant: MAZDA MOTOR CORPORATION

Inventor： Yoshiyuki UEHANE ,  Junji UMEMURA ,  Tomoaki FUJIYAMA ,  Koji HADAMA ,  Makoto MIHARA

IPC: F02B37/18 ,  F01D9/02

CPC classification number: F02B37/183 ,  F01D9/026 ,  F01D17/105 ,  F01D17/148 ,  F01D17/18 ,  F05D2220/40 ,  Y02T10/144

Abstract: Disclosed herein is a technique for providing an engine supercharger of a reduced size allowing an exhaust gas to be introduced smoothly into a turbine scroll. A turbine for use in this supercharger includes: a turbine lead-in route, into which the exhaust gas is introduced; a turbine scroll formed continuously with the turbine lead-in route to allow the exhaust gas to swirl around inside; a turbine wheel to turn on an axis of rotation; a turbine lead-out route; a wastegate passage to bypass the exhaust gas around the turbine scroll; and a wastegate valve. The turbine lead-in route includes a throat portion having a tapered downstream portion. The wastegate passage branches from that throat portion.