Title:
EXCAVATING BUCKET DRIVE EQUIPMENT
Document Type and Number:
Japanese Patent JP2000064755
Kind Code:
A
Abstract:
To provide an excavating bucket drive equipment capable of performing an optimum control for a drive torque acting on a hydraulic motor with a simple circuit configuration.
In a drive circuit of a hydraulic motor 2, provided are an electromagnetic proportional relief valve 8 for controlling a pressure in a pipeline 10 and an electromagnetic proportional relief valve 9 controlling the pressure inside a pipeline 11. Control signals I8, I9 from a controller 20 are output to solenoids 8a, 9a of the electromagnetic proportional relief valves 8, 9 and by this control signal I8, I9, the relief pressure of the electromagnetic proportional relief valves 8, 9 is controlled to a value corresponding to the operation position of a selection switch 21.
Inventors:
KAWARAI TAKESHI
Application Number:
JP23730998A
Publication Date:
February 29, 2000
Filing Date:
August 24, 1998
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACHINERY
International Classes:
E21B3/035; E21B3/02; (IPC1-7): E21B3/02
Attorney, Agent or Firm:
Fuyuki Nagai