GEAR BEARING STRUCTURE FOR EXTERNAL GEAR PUMP

WIPO Patent Application WO/2024/024041

A1

In an external gear pump (P), a pair of gears (G1, G2) are accommodated inside a pump body (B). An intake chamber (2I) is formed on one side of a portion at which the pair of gears (G1, G2) mesh, and a discharge chamber (2O) is formed on the other side. Rotation of the pair of gears (G1, G2) sends a fluid from the intake chamber (2I) to the discharge chamber (2O) along the circumferential direction. A cylindrical bushing (F) that holds the rotation shaft (GS1) of at least one (G1) of the pair of gears (G1, G2) in a rotatable manner is provided, with a lubricating liquid film being formed between the bushing (F) and the rotation shaft (GS1). One end (P3) of the bushing (F) faces fluid on the high-pressure discharge chamber (2O) side, and the other end thereof faces fluid on the low-pressure intake chamber (2I) side. A discharge groove (107) formed in the inner circumferential surface (100) of the bushing (F) has one end which is on the high-pressure side and which is closed, and another end which is on the low-pressure side and which is open. The discharge groove (107) has a length which is not less than half the length of the bushing (F) in the direction of the rotation shaft.

TANIDA MASAHIRO (JP)
UMEKI YASUYOSHI (JP)
SHIMAMURA AKIHIRO (JP)
TAKAMIYA KENJI (JP)

PCT/JP2022/029142

February 01, 2024

July 28, 2022

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IHI CORP (JP)

F04C2/18

WO2020241035A1

2020-12-03

JP2001165062A	2001-06-19
JP2022120971A	2022-08-19

MIYOSHI Hidekazu et al. (JP)

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