EP 1832686 A1 20070912 - Hydraulic lock
Title (en)
Hydraulic lock
Title (de)
Hydraulische Verriegelungsvorrichtung
Title (fr)
Dispositif de verrouillage hydraulique.
Publication
Application
Priority
CN 06250185 U 20060306
Abstract (en)
A hydraulically-controlled lock apparatus for a hydraulic excavator is disclosed. The apparatus includes a first main pump (6), a second main pump (5), a main control valve (8), a first travel motor (1), a second travel motor (2), and a hydraulic fluid reservoir (4). The hydraulic circuits from the first main pump (6) and the said second main pump (5) to the main control valve (8) are connected respectively to the two entrances of a hydraulic unloading valve. The exit of the hydraulic unloading valve is connected to the hydraulic fluid reservoir (4). The hydraulic unloading valve is a logic unloading valve (3), or a 2/2 way unloading valve (9), or a pilot hydraulically-controlled unloading valve (10). The hydraulically-controlled lock apparatus disclosed by the present invention while effectively reducing the loss of fluid return pressure of the hydraulically manipulating valve, features simple structure, easy manipulation, reliable operation, and a high price to performance ratio.
IPC 8 full level
E02F 9/22 (2006.01)
CPC (source: EP)
E02F 9/2253 (2013.01); E02F 9/226 (2013.01); E02F 9/2292 (2013.01)
Citation (search report)
- [X] US 2001036413 A1 20011101 - MCFADDEN DAN C [US], et al
- [Y] US 2003037465 A1 20030227 - TOJI YUTAKA [JP], et al
- [Y] US 5251440 A 19931012 - BONG-DONG HOANG [KR], et al
- [A] EP 0928849 A2 19990714 - HITACHI CONSTRUCTION MACHINERY [JP]
- [A] US 6038859 A 20000321 - MANGANO ALAIN [FR], et al
- [A] PATENT ABSTRACTS OF JAPAN vol. 014, no. 514 (M - 1046) 13 November 1990 (1990-11-13)
- [A] PATENT ABSTRACTS OF JAPAN vol. 2000, no. 23 10 February 2001 (2001-02-10)
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 NL PL PT RO SE SI SK TR
Designated extension state (EPC)
AL BA HR MK YU
DOCDB simple family (publication)
DOCDB simple family (application)
EP 06118421 A 20060803