Title:
HYDRAULIC DRIVE SYSTEM FOR CONSTRUCTION MACHINERY
Document Type and Number:
WIPO Patent Application WO/2016/092808
Kind Code:
A1
Abstract:
A hydraulic drive system for construction machinery, comprising: a pump that supplies hydraulic oil to a boom cylinder and a rotating hydraulic motor; a regenerative hydraulic motor coupled to the pump and having guided thereto hydraulic oil that has been discharged from the boom cylinder during lowering of the boom and/or hydraulic oil that has been discharged from the rotating hydraulic motor during rotation deceleration; an engine that drives the pump; an alternator attached to the engine and that, when power is supplied thereto, is capable of rotating an output shaft of the engine; a condenser connected to the alternator; a power converter interposed between the alternator and the condenser; and a control device that switches the power converter between a servo ON state and a servo OFF state and, when the power converter has been switched to the servo ON state, controls the power converter by using either a charge mode or a discharge mode.
Inventors:
KONDO AKIHIRO
YUDATE YOJI
KATO TAKEHISA
YUDATE YOJI
KATO TAKEHISA
Application Number:
PCT/JP2015/006069
Publication Date:
June 16, 2016
Filing Date:
December 07, 2015
Export Citation:
Assignee:
KAWASAKI HEAVY IND LTD (JP)
International Classes:
F15B21/14; E02F9/20
Foreign References:
| JP2012193551A | 2012-10-11 | |||
| JP2011202458A | 2011-10-13 | |||
| JP2001197785A | 2001-07-19 |
Attorney, Agent or Firm:
PATENT CORPORATE BODY ARCO PATENT OFFICE (JP)
Patent business corporation Owner old patent firm (JP)
Patent business corporation Owner old patent firm (JP)
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