Abstract: A hybrid exhaust gas turbocharger is provided, which is capable of preventing the supercharger from being damaged due to a rotary shaft being moved to a large extent in an axial direction by vibration generated from the internal combustion engine and a rotary portion in contact with a stationary portion in the supercharger when the supercharger is mounted on an internal combustion engine. A restraint mechanism (35) including a thrust collar (41) attached to a shaft end of a rotary shaft (19a) of a generator positioned on a side opposite to a flexible coupling and two thrust bearings (42) disposed to oppose both end surfaces forming a flange portion (44) of the thrust collar (41) is accommodated in a recess (51) formed on a front surface side of a shell housing positioned on a side opposite to the casing.

Abstract: A hybrid exhaust gas turbocharger is provided, which is capable of preventing the supercharger from being damaged due to a rotary shaft being moved to a large extent in an axial direction by vibration generated from the internal combustion engine and a rotary portion in contact with a stationary portion in the supercharger when the supercharger is mounted on an internal combustion engine. A restraint mechanism (35) including a thrust collar (41) attached to a shaft end of a rotary shaft (19a) of a generator positioned on a side opposite to a flexible coupling and two thrust bearings (42) disposed to oppose both end surfaces forming a flange portion (44) of the thrust collar (41) is accommodated in a recess (51) formed on a front surface side of a shell housing positioned on a side opposite to the casing.

Abstract: A centrifugal compressor has a plurality of seals arranged at the back of an impeller for sealing the impeller outlet and form an annular space defined at the back of the impeller. The annular space is fed with a cold gas under a higher pressure than that of the air discharged at the impeller outlet. Thus, the back of the impeller is cooled down.

Abstract: A method and an apparatus for controlling a rolling mill which dampens a snake motion of a material being rolled is disclosed. According to this method and apparatus, an amount corresponding to the snake motion of the material being rolled is detected, and the value thus detected is added to a value corresponding to a differentiated value of said detected value. A control operation is applied to the material being rolled to thereby control the snake motion of the material.