Ihi Corporation

Masahiro Tanida

Satoru Ohashi

Shusaku Yamasaki

Norihisa Handa

Takashi Sato

Naoki Seki

Kenji Takamiya

Akihiro Shimamura

Koushi Ishimoto

Motoaki Shito

In an external gear pump, a first bushing of a rotational shaft of a first gear has a second surface facing to a first surface of a pump body. A recess for supplying high-pressure lubricating oil between an inner circumferential surface of the first bushing and an outer circumferential surface of the rotational shaft is opened on the inner circumferential surface within a low pressure range associating with an inlet chamber of fluid. A bushing-side supply passage for supplying the high-pressure lubricating oil to the recess is formed within the first bushing. A bushing-side inlet port of the bushing-side supply passage is opened on the second surface within a high pressure range associating with an outlet chamber of the fluid. A body-side supply passage for supplying the high-pressure lubricating oil to a body-side supply port opened on the first surface is formed within the pump body.

External gear pump

A rotary machine capable of carrying out efficient cooling without increasing costs or deteriorating performance is provided. A motorserving as the rotary machine has a rotorconfigured to be rotatable around a rotary shaft, a statorhaving a stator corearranged around the rotorand a coilattached to the stator coreso that a coil end partprotrudes from each end of the stator core, mold membersandformed at both ends of the stator core, to cover base parts of the coil end parts, and partition partsandattached in contact with the mold membersand, to separate a space Sin which the rotoris arranged from a space Sin which the coil end partsare arranged.

Rotary machine

On an inner circumference side of a stator fixed in an inner housing, a rotor is arranged. The rotor rotates through a bearing with respect to a center shaft that is a stationary shaft fixed to outer housings. Oil introduced into a rotor oil inlet path in the center shaft flows through a communication path and a clearance on an outer circumference of the center shaft into an oil path in the rotor. The oil flowing through the oil path cools a permanent magnet, lubricates the bearing, and is discharged from a rotor oil discharge port to the outside of the inner housing. The oil in the clearance is sealed with a thread seal, i.e., an inner thread formed in an inner face of an end ring and is prevented from flowing toward the bearing.

Growing community of inventors

Tokyo, Japan

Masahiro Tanida