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
KATO TAKEHISA
Application Number:
PCT/JP2018/033617
Publication Date:
March 21, 2019
Filing Date:
September 11, 2018
Export Citation:
Assignee:
KAWASAKI HEAVY IND LTD (JP)
International Classes:
F15B21/14; E02F9/22
Foreign References:
| JP2016080009A | 2016-05-16 | |||
| JP2016148392A | 2016-08-18 | |||
| JP2008075365A | 2008-04-03 | |||
| JPS61254722A | 1986-11-12 | |||
| JP2013245787A | 2013-12-09 | |||
| US20170241445A1 | 2017-08-24 |
Attorney, Agent or Firm:
PATENT CORPORATE BODY ARCO PATENT OFFICE (JP)
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