Title:
HYDRAULIC DRIVE DEVICE FOR CONSTRUCTION MACHINERY
Document Type and Number:
WIPO Patent Application WO/2014/073338
Kind Code:
A1
Abstract:
During aerial boom lowering of a boom (131) by a front work machine (130) in which rotation by the tare weight is possible, potential energy is regenerated by working a hydraulic pump/motor (7) as a motor, operating a generator/electric motor (10) as a generator, and performing power generation using pressure oil discharged from the bottom-side chamber (5b) of a boom cylinder (5). When the front work machine (130) is jacking and rotation of the boom (131) by the tare weight is not possible, jacking is performed by operating the generator/electric motor (10) as an electric motor, working the hydraulic pump/motor (7) as a pump, and supplying pressure oil from the bottom-side chamber (5b) of the boom cylinder (5) to the rod-side chamber (5a) of the boom cylinder (5) without supplying pressure oil from the main pump (2) to the rod-side chamber (5a) of the boom cylinder (5).
Inventors:
SATO KENSUKE (JP)
NAKAMURA TSUYOSHI (JP)
ISHIKAWA KOUJI (JP)
NAKAMURA TSUYOSHI (JP)
ISHIKAWA KOUJI (JP)
Application Number:
PCT/JP2013/077995
Publication Date:
May 15, 2014
Filing Date:
October 15, 2013
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACHINERY (JP)
International Classes:
F15B21/14; E02F9/22; F15B11/02; F15B11/028
Domestic Patent References:
| WO2004070211A1 | 2004-08-19 |
Foreign References:
| JP2009299719A | 2009-12-24 | |||
| JP4279837B2 | 2009-06-17 | |||
| JP2010112559A | 2010-05-20 | |||
| JP2009299719A | 2009-12-24 |
Other References:
See also references of EP 2918854A4
Attorney, Agent or Firm:
KASUGA Yuzuru (JP)
Kasuga 讓 (JP)
Kasuga 讓 (JP)
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