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Title:
HYDRAULIC DRIVE CIRCUIT AND SERVO SYSTEM
Document Type and Number:
Japanese Patent JP2001124003
Kind Code:
A
Abstract:

To provide a hydraulic drive servo system capable of realizing both of slow speed and highly accurate servo control for accurate machining and rapid feed control for reducing cycle time.

A movable cylinder 10-1 in a cylinder mechanism 10 is hydraulically driven to drive a driven body connected there to This circuit includes a first hydraulic circuit for performing the driven feed body accurate feed motion in a low speed range through a small capacity servo valve 11 capable of changing over a drive direction normally and revesely and a second hydraulic circuit for performing the driven body motion in a high speed range including a first valve means comprising large capacity valves 15 and 16 for normal drive direction and a second valve means comprising large capacity valves 17 and 18 for reverse drive direction. The circuit is connected the first and second hydraulic circuits being parallel with each other between a hydraulic pressure source and the cylinder mechanism and provided with a controller 20, which controls the first and second valve means and a servo valve according to the signals, position commands PC and speed commands SC sent form a position detecting sensor 19.


Inventors:
OURA MASAHIDE
Application Number:
JP1999000300514
Publication Date:
May 08, 2001
Filing Date:
October 22, 1999
Export Citation:
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Assignee:
SUMITOMO HEAVY INDUSTRIES
International Classes:
F15B9/09; F15B11/04; (IPC1-7): F15B9/09; F15B11/04
Attorney, Agent or Firm:
後藤 洋介 (外1名)