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Patent Searching and Data


Title:
HYDRAULIC CIRCUIT FOR CONSTRUCTION MACHINERY
Document Type and Number:
WIPO Patent Application WO/2013/018271
Kind Code:
A1
Abstract:
A hydraulic circuit for construction machinery, equipped with: multiple hydraulic pumps; a remote control valve; a main circuit having the hydraulic pumps as the hydraulic pressure source and containing multiple hydraulic actuators and multiple control valves; an accumulator circuit containing an accumulator that functions as a pilot hydraulic pressure source of the remote control valve; a distribution valve; and an auxiliary pressure accumulation line. One of the hydraulic pumps is a dual-use pump which also serves as a pressure accumulation source of the accumulator, and the distribution valve is provided in the pump line of the dual-use pump, and has a pressure-accumulation position and a pressure-accumulation-stopped position. The accumulator circuit has a pressure accumulation control valve arranged in series with the distribution valve, and when the pressure accumulation of the accumulator is completed, this pressure accumulation control valve closes and stops the supply of operating oil to the accumulator. The auxiliary pressure accumulation line is provided such that the pressure of the hydraulic pumps other than the dual-use pump is introduced between the distribution valve and the pressure accumulation control valve.

Inventors:
SAOTOME YOSHIMI
Application Number:
PCT/JP2012/004175
Publication Date:
February 07, 2013
Filing Date:
June 27, 2012
Export Citation:
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Assignee:
KOBELCO CONSTR MACH CO LTD (JP)
SAOTOME YOSHIMI
International Classes:
F15B11/02; E02F9/22; F15B11/16
Foreign References:
JPH0566381U1993-09-03
JP2001020903A2001-01-23
JP2002327714A2002-11-15
Attorney, Agent or Firm:
KOTANI, Etsuji et al. (JP)
Etsuji Kotani (JP)
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Claims: