Turbine supercharger and two-stage supercharging system

Patent metadata

Field	Value
Publication number	US-10697377-B2
Application number	US-201515550663-A
Country	US
Kind code	B2
Filing date	Mar 30, 2015
Priority date	Mar 30, 2015
Publication date	Jun 30, 2020
Grant date	Jun 30, 2020

Abstract

A turbine supercharger includes: a turbine; a turbine housing which houses the turbine; and a turbine bypass valve for controlling a flow rate of exhaust gas to be supplied to the turbine. The turbine housing includes, inside the turbine housing: a scroll flow passage for guiding the exhaust gas to the turbine; an outlet flow passage for discharging the exhaust gas supplied to the turbine to outside of the turbine housing; and a bypass flow passage bypassing the turbine and connecting the scroll flow passage and the outlet flow passage. The turbine bypass valve includes: a valve rod; a valve body having a flat plate shape and being configured to revolve about the valve rod; and a valve housing having a cylindrical shape and defining a part of the bypass flow passage inside the valve housing. The valve housing is fixed to an inner peripheral wall surface of the bypass flow passage, inside the turbine housing.

First claim

The invention claimed is:

1. A turbine supercharger, comprising:
a turbine;
a turbine housing which houses the turbine; and
a turbine bypass valve for controlling a flow rate of exhaust gas to be supplied to the turbine,
wherein the turbine housing includes, inside the turbine housing:
a scroll flow passage for guiding the exhaust gas to the turbine;
an outlet flow passage for discharging the exhaust gas supplied to the rbine to outside of the turbine housing; and
a bypass flow passage bypassing the turbine and connectinghe scroll flow passage and the outlet flow passage,

wherein the turbine bypass valve comprises
a valve rod;
a valve body having a flat plate shape and being configured to revolve about the valve rod; and
a valve housing having a cylindrical shape and defining a part of the bypass flow passage inside the valve housing, the valve housing including:
a valve seat surface being formed on an peripheral surface of the valve housing, extending along a direction intersecting with an axial direction of the bypass flow passage, and being configured to make contact with an outer peripheral portion of the valve body in a fully-closed state in which an opening degree of the valve body is zero degree, the valve seat surface including an upstream valve seat surface being oriented upstream in a flow direction of the exhaust gas and a downstream valve seat, surface being oriented downstream in the flow direction of the exhaust gas; and
a flow passage surface being formed on the inner peripheral surface of the valve housing, extending along the axial direction of the bypass, flow passage, and defining a passage region through which the exhaust gas passes between the flow passage surface and the outer peripheral portion of the valve body in a valve-open state in which the opening degree of the valve body is greater than zero degree, and

wherein the valve housing includes a seating portion having a cylindrical shape and including the inner peripheral surface on which the valve seat surface and the flow passage surface are formed integrally,
wherein a flat surface and a step portion extending inward from an upstream end of the flat surface are formed on the inner peripheral wall surface of the bypass flow passage,
wherein the seating portion is configured such that an end surface of the seating portion and the step portion are in contact while the seating portion is fixed to the flat surface,
wherein an inclined surface extending outward from upstream toward downstream is formed on the inner peripheral wall surface of the bypass flow passage, at a position upstream of the step portion, the inclined surface forming a width increasing; portion increasing an inner cross section and
wherein, provided that, when the valve body transitions from the fully-closed state to the valve-open state, a first side is a side at which the outer peripheral portion of the valve body rotates toward a downstream side of the bypass flow passage and a second side is a side at which the outer peripheral portion of the valve body rotates toward an upstream side of the bypass flow passage,
the outer peripheral portion of the valve body disposed on the second side is configured to pass through the width increasing portion.

2. An engine device including a two-stage supercharging system, comprising:
an engine;
an exhaust manifold into which exhaust gas discharged from the engine is introduced;
an exhaust system through which the exhaust gas discharged from the exhaust manifold flows;
a high-pressure stage supercharger having a high-pressure stage turbine configured to be driven by the exhaust gas discharged from the exhaust manifold; and
a low-pressure stage supercharger comprising a low-pressure stage turbine which is disposed downstream of the high-pressure stage supercharger in the exhaust system and which is configured to be driven by the exhaust gas discharged from the high-pressure stage supercharger,
wherein the high-pressure stage supercharger comprises the turbine supercharger according to claim 1 .

3. An engine device including a two-stage supercharging system, comprising:
an engine;
an exhaust manifold into which exhaust gas discharged from the engine is introduced;
an exhaust system through which the exhaust gas discharged from the exhaust manifold flows;
a high-pressure stage supercharger having a high-pressure stage turbine configured to be driven by the exhaust gas discharged from the exhaust manifold; and
a low-pressure stage supercharger comprising a low-pressure stage turbine which is disposed downstream of the high-pressure stage supercharger in the exhaust system and which is configured to be driven by the exhaust gas discharged from the high-pressure stage supercharger,
wherein the high-pressure stage supercharger comprises the turbine supercharger according to claim 1 , and
wherein the low-pressure stage supercharger comprises the turbine supercharger according to claim 1 .

Assignees

• Mitsubishi Heavy Ind Engine & Turbocharger Ltd

Inventors

• An Byeongil
• Suzuki Hiroshi

Classifications

• F02B37/013 Primary

  with exhaust-driven pumps arranged in series · CPC title

• Y02T10/12

  Improving ICE efficiencies · CPC title

• F02B37/183

  Arrangements of bypass valves or actuators therefor · CPC title

• F02D9/10

  having pivotally-mounted flaps · CPC title

• F02D9/04

  concerning exhaust conduits (throttle valves, or arrangements thereof in conduits F02D9/08) · CPC title