Title:
建設機械の油圧回路
Document Type and Number:
Japanese Patent JP7049213
Kind Code:
B2
Abstract:
Each of left and right direction switching valves includes: a pump port connected to a pump; a first compensation port connected to an upstream side of a corresponding pressure compensation valve; a second compensation port connected to a downstream side of the corresponding pressure compensation valve; a pair of supply/discharge ports connected to a corresponding travel motor; and a communication port. The communication ports of the left and right direction switching valves are connected by a communication line. When a spool shifts from a neutral position by the travel operation device, the pump port communicates with the first compensation port and the second compensation port communicates with one of the supply/discharge ports and the communication port. Each direction switching valve is configured wherein a degree of communication between the second compensation port and communication port increases in a shifting amount of the spool from the neutral position.
Inventors:
Seiji Aoki
Yoshiyuki Higashide
Masahiro Ohira
Hideki Nakajima
Yoshiyuki Higashide
Masahiro Ohira
Hideki Nakajima
Application Number:
JP2018151070A
Publication Date:
April 06, 2022
Filing Date:
August 10, 2018
Export Citation:
Assignee:
Kawasaki Heavy Industries, Ltd.
Caterpillar S.A.R.L.
Caterpillar S.A.R.L.
International Classes:
F15B11/16; B62D11/04; E02F9/22; F15B11/05
Domestic Patent References:
| JP2015064024A | ||||
| JP4261923A | ||||
| JP2006336731A |
Foreign References:
| KR1020050066038A | ||||
| US5950429 |
Attorney, Agent or Firm:
Aiko Patent Office, a patent business corporation
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