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Patent Searching and Data


Title:
HYDRAULIC DRIVE SYSTEM FOR CONSTRUCTION MACHINE
Document Type and Number:
WIPO Patent Application WO/2019/054366
Kind Code:
A1
Abstract:
This hydraulic drive system for a construction machine comprises: a bidirectionally tiltable pump connected to a turning motor; a regulator that adjusts the tilting angle of the bidirectionally tiltable pump; a main pump coupled to the bidirectionally tiltable pump; and a control device that controls the regulator such that the tilting angle of the bidirectionally tiltable pump decreases in accordance with a decrease in a turning operation signal outputted from a turning operation device when a turning deceleration operation is executed, and that switches a switching valve to a pressure accumulation position so as to bring an accumulator into communication with a discharge line of the main pump when a pressure accumulation condition, which includes solo execution of the turning deceleration operation, is satisfied, switches the switching valve to a pressure release position so as to bring the accumulator into communication with an intake line of the main pump when a pressure release condition is satisfied, and switches the switching valve to a neutral position when neither the pressure accumulation condition nor the pressure release condition is satisfied.

Inventors:
KONDO, Akihiro
KATO, Takehisa
Application Number:
JP2018/033617
Publication Date:
March 21, 2019
Filing Date:
September 11, 2018
Export Citation:
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Assignee:
KAWASAKI JUKOGYO KABUSHIKI KAISHA (1-1 Higashikawasaki-cho 3-chome, Chuo-ku Kobe-sh, Hyogo 70, 〒6508670, JP)
International Classes:
E02F9/22; F15B21/14
Foreign References:
JP2016080009A2016-05-16
JP2016148392A2016-08-18
JP2008075365A2008-04-03
JPS61254722A1986-11-12
JP2013245787A2013-12-09
US20170241445A12017-08-24
Attorney, Agent or Firm:
PATENT CORPORATE BODY ARCO PATENT OFFICE (3rd Fl, Bo-eki Bldg. 123-1, Higashimachi, Chuo-ku, Kobe-sh, Hyogo 31, 〒6500031, JP)
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