Ishikawajima-harima Heavy Industries Co., Ltd.

Ihi Corporation

Ishikawajima-harima Jukogyo Kabushiki Kaisha

Nobuo Takei

Shigeru Takabe

Takashi Kobayashi

Takahiro Kobayashi

Atsushi Mori

Nobuyuki Ikeya

A bearing device includes a turbine-side bearingand a compressor-side bearingeach of which is a floating-bush type sliding bearing. A gap (turbine-side inner peripheral clearance TI) between the turbine-side bearingand a rotating shaftis set to be larger than a gap (compressor-side inner peripheral clearance CI) between the compressor-side bearingand the rotating shaft. In the bearing structure, unstable vibration including self-excited vibration can be suppressed.

Bearing structure of rotating machine, rotating machine, method of manufacturing bearing structure, and method of manufacturing rotating machine

A method of connecting an aluminum part with a steel part using a friction welding technique. The aluminum part is heat treated such as T6 treatment to raise its hardness. After that, the aluminum part is friction welded to the steel part. The steel part may also be heat treated to lower its hardness instead of or in addition to hardening of the aluminum part. A third part which has an intermediate hardness may be placed between the aluminum part and the steel part, and the aluminum part may be coupled with the steel part via the third part.

Method of connecting steel part with aluminum part and product made by

A seal arrangement for an engine-driven supercharger to prevent burning and abnormal wear of an rubber-made oil seal fitted on a shaft of a rotor of the supercharger. The supercharger includes a housing, a rotor chamber is formed in the housing and the rotor is rotatably placed in the rotor chamber. A shaft chamber is formed next to the rotor chamber. The rotor shaft projects from the rotor chamber into the shaft chamber in a longitudinal direction of the rotor. A bearing is provided inside the shaft chamber for supporting the rotor shaft at a free end of the rotor shaft. A lubrication oil is fed to the bearing. The supercharger sucks external air into the rotor chamber by making the rotor chamber pressure negative and rotates the rotor for compressing the air in the rotor chamber. The oil seal is fitted on the rotor shaft between the bearing and the rotor chamber for defining an oil chamber in the shaft chamber between the oil seal and the bearing. An air chamber is defined in the shaft chamber between the oil seal and the rotor chamber. An air passage extends from the air chamber to the outside so that positive or negative pressure of the air leaking to the air chamber from the rotor chamber is lowered or raised when the air enters the air chamber which communicates with the outside via the first air passage.

Seal arrangement for engine-driven supercharger

A seal device for a Lysholm compressor has a carbon seal ring and a metal maintaining ring arranged peripherally of a shaft of a male or female rotor, the seal ring being pressed against the maintaining ring to achieve sealing. Square root of a sum of square of surface roughness of the seal ring and square of surface roughness of the maintaining ring is in the range of 0.8 to 2.5 Z, which prevents occurrence of blisters on a surface of the seal ring and leaked oil amount can be within the leakage permissible level.

Growing community of inventors

Urayasu, Japan

Nobuo Takei