Global patent index - EP 1038070 A1

EP 1038070 A1 2000-09-27 - HYDRAULIC CONTROL MECHANISM FOR A MOBILE MACHINE TOOL, ESPECIALLY A WHEEL LOADER, FOR DAMPING LONGITUDINAL OSCILLATIONS

Title (en)

HYDRAULIC CONTROL MECHANISM FOR A MOBILE MACHINE TOOL, ESPECIALLY A WHEEL LOADER, FOR DAMPING LONGITUDINAL OSCILLATIONS

Title (de)

HYDRAULISCHE STEUERANORDNUNG FÜR EINE MOBILE ARBEITSMASCHINE, INSBESONDERE FÜR EINEN RADLADER, ZUR DÄMPFUNG VON NICKSCHWINGUNGEN

Title (fr)

SYSTEME DE COMMANDE HYDRAULIQUE POUR ENGIN MOBILE, NOTAMMENT POUR CHARGEUSE SUR ROUES, AFIN D'AMORTIR LES OSCILLATIONS DUES AU TANGAGE

Publication

EP 1038070 A1 (DE)

Application

EP 98963493 A

Priority

  • DE 19754828 A
  • EP 9807509 W

Abstract (en)

[origin: DE19754828A1] The invention relates to a hydraulic control mechanism for a mobile machine tool, especially a wheel loader, for damping longitudinal oscillations. The inventive hydraulic control mechanism comprises at least one hydraulic cylinder (12) which helps to move a working tool, a directional control valve (11) for controlling the paths of the hydraulic fluid between a pressure chamber (15) of the hydraulic cylinder (12), a source of hydraulic fluid and a tank (27), and a hydraulic accumulator (21) which can be connected to a source of hydraulic fluid by means of a filling valve (22; 71) located in a filling line (20), whose charge pressure can be increased to a maximum pressure by means of said filling valve (22; 71) and which can be connected to the pressure chamber (15) of the hydraulic cylinder (12) in order to dampen the longitudinal oscillations. The inventive mechanism also has a shut-off valve (22; 75) which can be moved into a through position in which hydraulic fluid can flow through from the hydraulic accumulator (21) to the pressure chamber (15) of the hydraulic cylinder (12) and vice versa, when a first condition is fulfilled. According to the invention, the shut-off valve (22; 75) can also be moved into its shut-off position when the first condition is fulfilled in the event that the charge pressure in the pressure chamber (15) of the hydraulic cylinder (12) or the accumulator pressure reaches a maximum pressure.

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

E02F 9/22

IPC 8 full level (invention and additional information)

E02F 9/22 (2006.01); F15B 1/02 (2006.01); F15B 21/14 (2006.01)

CPC (invention and additional information)

E02F 9/2267 (2013.01); E02F 9/2207 (2013.01); E02F 9/2217 (2013.01); E02F 9/2271 (2013.01); F15B 1/021 (2013.01)

Citation (search report)

See references of WO 9929970A1

Designated contracting state (EPC)

DE FR GB IT SE

EPO simple patent family

DE 19754828 A1 19990624; DE 19754828 C2 19991007; EP 1038070 A1 20000927; JP 2001526335 A 20011218; US 6351944 B1 20020305; WO 9929970 A1 19990617

INPADOC legal status

2004-05-19 [18D] DEEMED TO BE WITHDRAWN

- Ref Legal Event Code: 18D

- Effective date: 20031113

2003-01-08 [RAP1] TRANSFER OF RIGHTS OF AN EP PUBLISHED APPLICATION

- Owner name: BOSCH REXROTH AG

- Ref Legal Event Code: RAP1

2002-07-31 [17Q] FIRST EXAMINATION REPORT

- Ref Legal Event Code: 17Q

- Effective date: 20020614

2000-09-27 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 20000608

2000-09-27 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): DE FR GB IT SE