Global Patent Index - EP 2024647 A1

EP 2024647 A1 2009-02-18 - HYDROSTATIC DRIVE HAVING VOLUMETRIC FLOW COMPENSATION

Title (en)

HYDROSTATIC DRIVE HAVING VOLUMETRIC FLOW COMPENSATION

Title (de)

HYDROSTATISCHER ANTRIEB MIT VOLUMENSTROMAUSGLEICH

Title (fr)

MECANISME D'ENTRAINEMENT HYDROSTATIQUE AVEC EQUILIBRAGE DES VOLUMES

Publication

EP 2024647 A1 (DE)

Application

EP 07725766 A

Priority

  • EP 2007004886 W
  • DE 102006025987 A

Abstract (en)

[origin: WO2007140947A1] The invention relates to a hydrostatic drive having a first and a second hydraulic pump (11, 12) and a double-action hydraulic cylinder (2). The double-action hydraulic cylinder (2) has a first working chamber (7) and a second working chamber (8). The first working chamber (7) is delimited by a first piston face area (4) of a working piston (3) and the second working chamber (8) is delimited by a second piston face area (5) of the working piston (3). The first working chamber (7) is connected to a first connection (13) of the first hydraulic pump (11) and a first connection (14) of the second hydraulic pump (12). The second working chamber (8) is connected to a second connection (16) of the second hydraulic pump (12). A second connection (15) of the first hydraulic pump (11) is connected to a pressure-medium reservoir. The ratio of the first piston face area (4) to the second piston face area (5) differs from the ratio of the overall delivery volume of the two hydraulic pumps (11, 12) to the delivery volume of the second hydraulic pump (12). A removal valve (45) for removing pressure medium is provided for volumetric flow compensation.

IPC 8 full level (invention and additional information)

F15B 7/00 (2006.01)

CPC (invention and additional information)

F15B 7/006 (2013.01)

Citation (search report)

See references of WO 2007140947A1

Designated contracting state (EPC)

AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR

Designated extension state (EPC)

AL BA HR MK RS

EPO simple patent family

WO 2007140947 A1 20071213; CN 101341342 A 20090107; CN 101341342 B 20110518; EP 2024647 A1 20090218; JP 2009539043 A 20091112; KR 20090014137 A 20090206; US 2009064676 A1 20090312; US 8033107 B2 20111011

INPADOC legal status


2010-09-29 [18D] APPLICATION DEEMED TO BE WITHDRAWN

- Effective date: 20100407

2009-12-16 [DAX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT (TO ANY COUNTRY) (DELETED)

2009-07-01 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20090528

2009-03-18 [RIN1] INVENTOR CHANGED BEFORE GRANT

- Inventor name: TIKKANEN, SEPPO

2009-02-18 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20080123

2009-02-18 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR

2009-02-18 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO:

- Countries: AL BA HR MK RS