Global Patent Index - EP 1319763 A1

EP 1319763 A1 2003-06-18 - Work vehicle with turning upper structure

Title (en)

Work vehicle with turning upper structure

Title (de)

Arbeitsfahrzeug mit drehbarer oberer Struktur

Title (fr)

Véhicule de travail avec structure supérieure tournante

Publication

EP 1319763 A1 (EN)

Application

EP 02027168 A

Priority

JP 2001379672 A

Abstract (en)

The pump discharge volumetric flow of a variable delivery oil pressure pump (12) is rapidly increased when the vehicle's working machine starts working to improve the machine's action efficiency and is slowly increased when the vehicle starts traveling to diminish the shock thereto. An arrangement is thus provided including a torque control valve (21) for controlling the pump discharge volumetric flow of the pump (12), an electromagnetic proportional pressure reducing valve (23) for applying a pilot pressure to the torque control valve (21) and a controller (28) for controlling the current to energize the solenoid (23a) of the electromagnetic proportional pressure reducing valve (23). When a machine control valve (14) is exclusively operated, the controller (28) rapidly changes the current to the solenoid (23a) of the electromagnetic proportional control valve (23) to rapidly increase the pump discharge volumetric flow. And, when the vehicle traveling morion control valve (13) is operated, it slowly changes the energizing current to slowly increase the pump discharge volumetric flow. <IMAGE>

IPC 1-7 (main, further and additional classification)

E02F 9/22

IPC 8 full level (invention and additional information)

E02F 9/20 (2006.01); E02F 9/22 (2006.01); F15B 11/02 (2006.01); F15B 11/04 (2006.01)

CPC (invention and additional information)

E02F 9/2207 (2013.01); E02F 9/2235 (2013.01); E02F 9/2296 (2013.01); F02D 41/021 (2013.01)

Citation (search report)

Designated contracting state (EPC)

GB IT

EPO simple patent family

EP 1319763 A1 20030618; JP 2003184805 A 20030703; JP 3812728 B2 20060823; KR 20030051244 A 20030625

INPADOC legal status


2009-03-04 [18D] APPLICATION DEEMED TO BE WITHDRAWN

- Effective date: 20080906

2004-04-15 [REG DE 8566] DESIGNATED COUNTRY DE NOT LONGER VALID

2004-03-10 [AKX] PAYMENT OF DESIGNATION FEES

- Designated State(s): GB IT

2003-06-18 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20021205

2003-06-18 [AK] DESIGNATED CONTRACTING STATES:

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

2003-06-18 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO:

- Countries: AL LT LV MK RO