Title:
FLUID PRESSURE CIRCUIT AND WORK MACHINE
Document Type and Number:
Japanese Patent JP2016205451
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a fluid pressure circuit capable of attaining optimization of each of pump flow rates in respect to various operations of each of the control valves by a simple configuration.SOLUTION: A variable capacity type first pump P1 for supplying hydraulic oil to a turning hydraulic motor 16m is driven by an engine 19. A fixed capacity type second pump P2 supplying hydraulic oil to a stick cylinder 22c is driven by the engine 19 through a stepless transmission 27. A fixed capacity type third pump P3 supplying hydraulic oil to a bucket cylinder 23c is driven by the engine 19 through a stepless transmission 31. A capacity of the first pump P1 and a transmission gear ratio of the stepless transmissions 27, 31 are changed by a controller CT in response to an operating amount of at least any one of the control valves CV1 to CV3 for at least controlling direction of hydraulic fluid supplied to each of the turning hydraulic motor 16m and the cylinders 22c, 23c.SELECTED DRAWING: Figure 1
Inventors:
NAKAJIMA HIDEKI
Application Number:
JP2015084716A
Publication Date:
December 08, 2016
Filing Date:
April 17, 2015
Export Citation:
Assignee:
CATERPILLAR SARL
International Classes:
F15B11/00; E02F9/22; F15B11/02; F15B11/17
Attorney, Agent or Firm:
樺澤 襄
Satoshi Kabazawa
Tetsuya Yamada
Satoshi Kabazawa
Tetsuya Yamada
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