Title:
CONSTRUCTION MACHINERY
Document Type and Number:
WIPO Patent Application WO/2013/121922
Kind Code:
A1
Abstract:
Construction machinery is provided which can significantly reduce fuel consumption through the efficient use of recovered energy. The construction machinery includes: a first hydraulic pump (3) and a second hydraulic pump (9) for discharging hydraulic fluid to operate an actuator (6); a second power source (7) for driving the second hydraulic pump (9); an energy storage means (8) for storing energy to drive the second power source (7); and a hydraulic fluid supply circuit (10) with a hydraulic fluid switching unit (11c) for receiving hydraulic fluid discharged from the first hydraulic pump (3) and hydraulic fluid discharged from the second hydraulic pump (9), and selecting one or both sources of hydraulic fluid to be supplied to the actuator (6). The construction machinery also includes a control device (20) for outputting switching instructions to the hydraulic fluid switching unit (11c) and for outputting drive instructions to the second power source (7) when the drive efficiency of the second hydraulic pump (9) and/or the amount of energy stored in the energy storage means (8) exceeds a predetermined set value.
Inventors:
IMURA SHINYA (JP)
SATAKE HIDETOSHI (JP)
ISHIKAWA KOUJI (JP)
HIJIKATA SEIJI (JP)
KANETA TOMOAKI (JP)
SATAKE HIDETOSHI (JP)
ISHIKAWA KOUJI (JP)
HIJIKATA SEIJI (JP)
KANETA TOMOAKI (JP)
Application Number:
PCT/JP2013/052550
Publication Date:
August 22, 2013
Filing Date:
February 05, 2013
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACHINERY (JP)
International Classes:
F15B11/00; E02F9/20; F15B11/02; F15B21/14
Foreign References:
| JP2000136806A | 2000-05-16 | |||
| JP2011163291A | 2011-08-25 | |||
| JPH05287774A | 1993-11-02 | |||
| JP2011174491A | 2011-09-08 | |||
| JPH0352403U | 1991-05-21 |
Attorney, Agent or Firm:
KASUGA Yuzuru (JP)
Kasuga 讓 (JP)
Kasuga 讓 (JP)
Download PDF:
Claims: