A vehicle with a turbocharged engine, including an engine body, an intake passage, an exhaust passage, a turbocharger, and a radiator. The radiator is provided with a cooling unit for cooling an engine coolant, and an upper tank into which the coolant is introduced after cooling the engine body. The turbocharger is provided with a turbine provided to the exhaust passage, a compressor provided to the intake passage, a coupling shaft coupling the turbine to the compressor, and bearings supporting the coupling shaft. The turbine is provided with an impeller for being rotated by introduced exhaust gas, and a turbine casing. The turbocharger is oil-cooled, and cooled by a lubricant. The turbine casing is formed from a sheet metal. The coupling shaft extends horizontally, and a height of an axial center of the shaft is above a height of an upper end of the upper tank of the radiator.

A shut-off member for a turbocharger for an internal combustion engine includes a first channel, a second channel, and a wall that separates the first channel from the second channel. A shut-off member opening is formed in the wall that connects the first channel and the second channel. The shut-off member opening is selectively openable and closable by a shut-off member body. A cooling channel is disposed in the wall and at least partially surrounds the shut-off member opening.

An object is to provide an engine system including an intake bypass device whereby it is possible to expand the operation range of a compressor without causing the output of a turbine to become insufficient. An engine system includes an intake bypass device including a bypass channel connecting a downstream side of a compressor of a turbocharger in an intake channel and an upstream side of a turbine of the turbocharger in an exhaust channel, a bypass valve disposed in the bypass channel and configured to control a flow of compressed intake air in the bypass channel, and a heating unit for heating the compressed intake air flowing through the bypass channel.

A turbocharger rotor shaft assembly and associated turbocharger that includes at least one turbine rotor member having a first face and an opposed second face; and a rotor shaft having a first end and an opposed second end distal from the first end, wherein the rotor shaft is connected to the at least one turbine rotor at a location proximate to the first end and projects outward therefrom, the rotor shaft having an outwardly oriented face and an interior chamber defined therein, the interior chamber having an interior chamber volume. The turbocharger rotor shaft also includes at least one thermal transfer material contained in the interior chamber of the rotor shaft that has a thermal conductivity value that is greater than the thermal conductivity value of the material of construction of the rotor shaft.

There is provided a turbocharger bearing housing having no necessity to use a core and capable of achieving cost reduction. A bearing housing of a turbocharger contains a shaft connecting a turbine and a compressor and turnably supports the shaft. The bearing housing of the turbocharger is divided into a turbine-side housing disposed at a turbine side and a compressor-side housing disposed at a compressor side. The turbine-side housing and the compressor-side housing is subjected to machining to thereby form a cooling water passage for supplying cooling water and a lubricating oil passage for supplying lubricating oil.

A turbocharger includes a turbine housing adapted to be arranged in the middle of an engine exhaust passage, a bearing housing coupled to the turbine housing, a turbine wheel located inside the turbine housing, a rotary shaft that is connected to the turbine wheel and is rotationally supported by the bearing housing, and a cooling water passage that is provided inside the turbine housing. The cooling water passage is located around the turbine wheel. The turbine housing includes a first connection portion joined to the bearing housing, a second connection portion joined to a part of the engine exhaust passage located on a downstream side of the turbine housing, and a heat insulating portion located between the cooling water passage and at least one of the first connection portion and the second connection portion.

In a turbine housing of a twin entry type turbocharger, a first scroll chamber communicating with a first exhaust manifold, and a second scroll chamber communicating with a second exhaust manifold are provided. A surface area of the first exhaust manifold is configured to be larger than a surface area of the second exhaust manifold, and these exhaust manifolds are cooled by a cooling mechanism. In the turbine housing, a first and second cooling water passages are respectively provided to cover the first and second scroll chambers. An internal combustion engine includes a cooling device that causes cooling water to flow into the first and second cooling water passages, and the cooling device is configured so that a temperature of the cooling water that is introduced into the second cooling water passage becomes lower than a temperature of cooling water that is introduced into the first cooling water passage.

A turbine housing includes a scroll passage, a medium passage, an exhaust introduction passage, and a partition wall. The scroll passage extends spirally and is located outside a turbine wheel. The scroll passage includes a spiral beginning and a spiral end. The exhaust introduction passage is connected to the spiral beginning and introduces the exhaust into the scroll passage. The partition wall is located between the spiral end and the exhaust introduction passage and extends in the circumferential direction of the turbine wheel. The medium passage includes a start section that includes an adjacent portion. The adjacent portion is adjacent to the partition wall in the direction of the rotation axis of the turbine wheel. The start section includes an inlet that introduces the cooling medium into the medium passage.

Provided is an electric-assist supercharger configured such that a motor (30) is attached to the end portion of a rotor shaft (15) close to a silencer (26), the rotor shaft (15) being connected to a compressor portion. Such a supercharger includes a suction air introduction path (24) formed in the silencer 26 such that a main suction air flow flows in the radial direction of the silencer (26) toward a connection portion between the silencer (26) and the compressor portion, and a cooling air intake path (40) formed in the silencer (26) in which at least an outlet thereof is on the center axis of the rotor shaft (15).

An impeller back surface cooling structure for cooling a back surface of a compressor impeller of a supercharger includes: a first member facing a back surface of a compressor impeller via a gap; and a second member extending in a circumferential direction of the compressor impeller and forming, between the first member and the second member, a cooling passage through which a cooling medium being a liquid flows.