Title:
HYDRAULIC SYSTEM FOR CONSTRUCTION EQUIPMENT
Document Type and Number:
WIPO Patent Application WO/2017/122836
Kind Code:
A1
Abstract:
The present invention provides a hydraulic system for construction equipment, the system comprising: a first spool installed on a fluid channel that connects a hydraulic pump and an optional device and connects the hydraulic pump and an attachment, the first spool having first and second ports provided on opposite sides thereof, respectively, wherein the first spool connects the fluid channel between the hydraulic pump and the optional device when switched by a first pilot signal pressure applied to the first port, and simultaneously connects the fluid channel between the hydraulic pump and the optional device and the fluid channel between the hydraulic pump and the attachment when switched by a second pilot signal pressure applied to the second port; a poppet installed to open/close a fluid channel connecting the hydraulic pump and the first spool, wherein the poppet controls the amount of hydraulic oil supplied from the hydraulic pump to the optional device when the first spool is switched; a second spool installed on a fluid channel connecting the first spool and the optional device, wherein the second spool controls a hydraulic oil supplied to the optional device through the first spool when switched; and a third spool connected with the first spool and the poppet, wherein the third spool is repeatedly switched to one side or an opposite side according to the magnitude of pressure repeatedly applied to opposite ends thereof, and controls a hydraulic oil supplied from the hydraulic pump to the poppet when switched.
Inventors:
JEON MAN SEUK (KR)
Application Number:
PCT/KR2016/000256
Publication Date:
July 20, 2017
Filing Date:
January 11, 2016
Export Citation:
Assignee:
VOLVO CONSTR EQUIP AB (SE)
JEON MAN SEUK (KR)
JEON MAN SEUK (KR)
International Classes:
E02F9/22; F02D29/04; F15B13/02
Domestic Patent References:
| WO2013002429A1 | 2013-01-03 |
Foreign References:
| KR100800081B1 | 2008-02-01 | |||
| JP2002106507A | 2002-04-10 | |||
| KR20150114949A | 2015-10-13 | |||
| JP2007315514A | 2007-12-06 |
Attorney, Agent or Firm:
KIM, Seon-Min (KR)
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