Title:
HYDRAULIC CIRCUIT OF CONSTRUCTION MACHINE
Document Type and Number:
Japanese Patent JP2023183040
Kind Code:
A
Abstract:
To provide a hydraulic circuit which can suppress an excessive rise of a temperature of working fluid and can prevent damage of an oil cooler.SOLUTION: A hydraulic circuit 2 includes a control valve 8 for controlling supply of working fluid from a hydraulic pump 4 to a work tool 6, a first return pipe line 20 connecting the control valve 8 and a working fluid tank 12, an oil cooler 24 disposed in the first return pipe line 20, a second return pipe line 26 branched from the first return pipe line 20 and extending to the working fluid tank 12 without passing through the oil cooler 24, a third return pipe line 30 branched from a pipe line 18 and extending to the first return pipe line 20 through a solenoid on-off valve 32, a controller 36 opening the control valve 8 and the solenoid on-off valve 32 on the basis of a signal output from an operation device 34, and a working fluid temperature sensor 38. The controller 36 reduces an amount of the working fluid passing through the oil cooler 24 when the temperature detected by the temperature sensor 38 is lower than a prescribed value.SELECTED DRAWING: Figure 2
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Inventors:
KONISHI ISAO
MAEDA HIROSHI
MINAMIURA HIRONAO
MIYAMORI KAZUYA
KATO YOSHITAKA
MAEDA HIROSHI
MINAMIURA HIRONAO
MIYAMORI KAZUYA
KATO YOSHITAKA
Application Number:
JP2022096413A
Publication Date:
December 27, 2023
Filing Date:
June 15, 2022
Export Citation:
Assignee:
CATERPILLAR SARL
International Classes:
F15B21/045
Attorney, Agent or Firm:
Atago Patent Attorneys Office
Sachiko Okunuki
Tsuyoshi Tsukano
Yoshifumi Kaneko
Sachiko Okunuki
Tsuyoshi Tsukano
Yoshifumi Kaneko