EP 1172325 A2 20020116 - Control device for hydraulic drive winch
Title (en)
Control device for hydraulic drive winch
Title (de)
Steuervorrichtung für einen hydraulischen Windenantrieb
Title (fr)
Dispositif de commande pour un treuil hydraulique
Publication
Application
Priority
- JP 2000212746 A 20000713
- JP 2001025132 A 20010201
Abstract (en)
A winding-down side pilot port (5b) of a control valve (5) is of a 2-port construction comprising a normal winding-down side port (5b1) having a large pressure receiving area and a free fall side port (5b2) having a small pressure receiving area, wherein in the free fall operation carried out by setting a motor (2) to a small capacity, a pilot pressure of a winding-down side remote control valve (8) is supplied to the free fall side port through a mode switching valve (22). Thereby, a stroke of the control valve (5) can be suppressed so that a speed of a motor (2) does not exceed an allowable speed. Additionally a load holding hydraulic system is disclosed with a hydraulic motor (101) and bidirectional pump (104) in closed circuit. <IMAGE>
IPC 1-7
B66D 1/44; B66D 1/48; B66D 1/08; F15B 13/04; F15B 13/042; F15B 11/042; F15B 11/12
IPC 8 full level
CPC (source: EP)
Designated contracting state (EPC)
FR GB IT NL
DOCDB simple family (publication)
DOCDB simple family (application)
EP 01302982 A 20010329