Title:
HYDRAULIC SYSTEM OF WORK MACHINE
Document Type and Number:
Japanese Patent JP2018080575
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a hydraulic system capable of properly operating both of a horizontal operation and ride control.SOLUTION: A hydraulic system is connected to a horizontal control section 41 of a second actuator 17 and a first actuator 14, and includes a ride control device 52 of the first actuator 14 and a discharge oil passage from the ride control device 52. The ride control device 52 includes an accumulator 53, and a ride control valve 54 which is switchable among a stop position at which communication between a first oil chamber of the first actuator 14 and the accumulator 53 is blocked, communication between a second oil chamber of the first actuator 14 and the discharge oil passage is blocked and a damping operation is stopped, a first operation position at which the first oil chamber and the accumulator 53 are communicated with each other, communication between the second oil chamber and the discharge oil passage is blocked and both of the horizontal operation and the damping operation can be operated, and a second operation position at which the first oil chamber and the accumulator 53 are communicated with each other and the second oil chamber and the discharge oil passage are communicated with each other.SELECTED DRAWING: Figure 1
Inventors:
FUKUDA YUJI
Application Number:
JP2017248152A
Publication Date:
May 24, 2018
Filing Date:
December 25, 2017
Export Citation:
Assignee:
KUBOTA KK
International Classes:
E02F9/22; E02F3/43; F15B11/02; F15B11/08; F15B11/16
Domestic Patent References:
| JP2005249039A | 2005-09-15 | |||
| JPH08277548A | 1996-10-22 | |||
| JP2007186942A | 2007-07-26 | |||
| JP2004534188A | 2004-11-11 | |||
| JP2004340313A | 2004-12-02 | |||
| JP2001200801A | 2001-07-27 | |||
| JPH1037902A | 1998-02-13 | |||
| JPH05209422A | 1993-08-20 |
Foreign References:
| US20120251283A1 | 2012-10-04 | |||
| WO2005035883A1 | 2005-04-21 | |||
| US5520499A | 1996-05-28 |
Attorney, Agent or Firm:
Mikio Yasuda