Pumpvorrichtung und Hydraulisches Kreislaufsystem für Baumaschinen

Details

Veröffentlichungs-Nr.

EP4749141

Anmeldetag

12. Juli 2024

Veröffentlichung

23. Januar 2025

Rechtsraum

EP

IPC

F15B11/17, E02F9/22, F15B11/00

Abstract

In a hydraulic circuit system and the pump device that use a tandem pump having arranged two hydraulic pumps that can independently control the flow rates of a plurality of delivery ports and use a plurality of selector valves, it is made possible to enhance the operability and to enhance the mountability of a pump device by a size reduction and a reduction in hydraulic hoses. To this end, first and second hydraulic pumps 11 and 12 that include four pump elements 11a to 11d and 12a to 12d that can independently control flow rates of hydraulic fluid delivered from delivery ports 45a to 45d and 46a to 46d, and are spaced in the axial direction of a shaft 14 to provide a tandem pump 30 have a port block 13 configured as a shared part and forming openings of the delivery ports 45a to 45d and 46a to 46d at a block surface 13S of the port block 13, and a block surface 13S of the port block 13 is coupled with a manifold block 40 mounting selector valves 41a to 41d and 42a to 42d and having service ports 43 and 44 formed therein.

Anmelder

Firmen

Danfoss Scotland Limited
Hitachi Construction Machinery Co., Ltd.

Land

🇬🇧 Großbritannien