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Patent Searching and Data


Title:
FLOW CONTROL VALVE FOR CONSTRUCTION MACHINE
Document Type and Number:
WIPO Patent Application WO/2016/111391
Kind Code:
A1
Abstract:
The present invention relates to a flow control valve for a construction machine, comprising: a boom valve block connected to a hydraulic pump; a boom spool coupled to the boom valve block so as to be slidably moved, and switched on by the supply of pilot signal pressure in order to carry out a boom-up or boom-down operation, thereby controlling the hydraulic oil supplied from the hydraulic pump to a boom cylinder; a boom-up flow control means for supplying the hydraulic oil from the hydraulic pump to the large chamber of the boom cylinder through the boom spool, when switching on the boom spool in order to carry out the boom-up operation; and a boom-down flow control means for returning a part of the hydraulic oil, which returns from the large chamber of the boom cylinder, to the hydraulic tank through the boom spool only at a predetermined pressure or higher, when the boom spool is switched on in order to carry out the boom-down operation, wherein the part of the hydraulic oil, which returns from the large chamber of the boom cylinder, is directly returned to the hydraulic tank through the boom spool, and the part of the hydraulic oil, which returns from the large chamber of the boom cylinder, is made to join, as regeneration flow, the small chamber side of the boom cylinder.

Inventors:
KANG MIN-HEUK (KR)
KIM JIN-WOOK (KR)
Application Number:
KR2015/000178
Publication Date:
July 14, 2016
Filing Date:
January 08, 2015
Export Citation:
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Assignee:
VOLVO CONSTR EQUIP AB (SE)
KANG MIN-HEUK (KR)
International Classes:
F15B13/02; E02F9/20; E02F9/22
Domestic Patent References:
WO2014014146A12014-01-23
Foreign References:
KR20100075332A2010-07-02
US5862831A1999-01-26
US20090101854A12009-04-23
JPH09210006A1997-08-12
Other References:
See also references of EP 3255284A4
Attorney, Agent or Firm:
YOON, Eui-Seoup (KR)
윤의섭 (KR)
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