Title:
CONSTRUCTION MACHINE
Document Type and Number:
Japanese Patent JP2018151036
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a two-engine type construction machine capable of improving mountability of a hydraulic closed circuit system onto the two-engine type construction machine to attain high energy saving.SOLUTION: A hydraulic closed circuit system further includes a second engine 9b. At least four closed circuit pumps 12a, 12b, 14a, 14b, 16a, 16b, 18a, 18b comprise closed circuit pumps 12a, 14a, 16a, 18a driven by a first engine 9a, and closed circuit pumps 12b, 14b, 16b, 18b driven by the second engine 9b. The at least four closed circuit pumps have a connection structure where, when a plurality of electromagnetic selector valves 43, 45, 47, 49 is selectively switched to a communication position, discharged oil from one of two discharge ports is made confluent at every two pumps on an upstream side of the plurality of electromagnetic selector valves, and then the confluent pressure oil is supplied to the plurality of electromagnetic selector valves.SELECTED DRAWING: Figure 3
Inventors:
HIRAKU KENJI
KUSAMA TAKASHI
AIHARA MITSUO
TAKAHASHI HIROMASA
SHIMIZU JURI
KUSAMA TAKASHI
AIHARA MITSUO
TAKAHASHI HIROMASA
SHIMIZU JURI
Application Number:
JP2017049154A
Publication Date:
September 27, 2018
Filing Date:
March 14, 2017
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACHINERY
International Classes:
F15B11/02; E02F9/22; F15B11/08; F15B11/17
Attorney, Agent or Firm:
Kaichi International Patent Office