Title:
HYDRAULIC SYSTEM FOR HYDRAULIC WORKING MACHINE
Document Type and Number:
WIPO Patent Application WO/2012/133104
Kind Code:
A1
Abstract:
[Problem] To provide a hydraulic system for a hydraulic working machine, the hydraulic system being configured so that the influence of the impairment of the responsiveness to the control of the speed of an actuator is reduced to a minimum level to enable the hydraulic system to have satisfactory operability equivalent to the operability of a spool-type flow rate control valve.
[Solution] The present hydraulic system for a hydraulic shovel is configured so that rotational power is inputted from a rotational power generation means (11) into a hydraulic pump (12) to generate hydraulic power and an actuator (14) is operated by the hydraulic power. The hydraulic system is configured so as to comprise a recovery ratio control means for branching a hydraulic oil discharge oil path (20), which is from the actuator (14), into a flow rate control oil path (21) which is an oil path connecting to the spool of a flow rate control valve (19) controlled by lever operation and into a power recovery oil path (22) which is an oil path connecting to a variable displacement motor (23) for converting the hydraulic power of discharged hydraulic oil into reusable energy, the recovery ratio control means controlling the variable displacement motor (23) so that the ratio of the flow rate of the power recovery oil path (22) to the flow rate generated in the flow rate control oil path (21) by the lever operation is a fixed ratio (α) set in advance.
More Like This:
| WO/2018/168236 | HYDRAULIC DRIVE DEVICE FOR WORK MACHINE |
| JP5317517 | Control device for hybrid construction machinery |
| JP3590547 | Fluid pressure actuator control device |
Inventors:
HIGUCHI TAKESHI (JP)
Application Number:
PCT/JP2012/057329
Publication Date:
October 04, 2012
Filing Date:
March 22, 2012
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACHINERY (JP)
HIGUCHI TAKESHI (JP)
HIGUCHI TAKESHI (JP)
International Classes:
F15B21/14; E02F9/22; F15B11/02; F15B11/08
Foreign References:
| JP2006511744A | 2006-04-06 | |||
| JP2002031104A | 2002-01-31 | |||
| JPS5754704A | 1982-04-01 | |||
| JPH11117907A | 1999-04-27 |
Attorney, Agent or Firm:
The Patent Body Corporate TAKEWA INTERNATIONAL PATENT OFFICE (JP)
Patent business corporation Takekazu international patent firm (JP)
Patent business corporation Takekazu international patent firm (JP)
Download PDF:
Claims: