Patent ID: 11927205
Assignee: KOMATSU LTD.
Field: Civil engineering (Other fields)
Classification: CPC F  E | IPC E  F

Claim 1:
2. The hydraulic system according to claim 1, further comprising:
an arm first bottom oil passage connecting the bottom chamber and the arm first direction switching valve;
an arm second bottom oil passage connecting the bottom chamber and the arm second direction switching valve;
an arm first rod oil passage connecting the rod chamber and the arm first direction switching valve;
an arm second rod oil passage connecting the rod chamber and the arm second direction switching valve;
an arm first pump oil passage connecting the first hydraulic pump and the arm first direction switching valve;
an arm second pump oil passage connecting the second hydraulic pump and the arm second direction switching valve;
an arm first tank oil passage connecting a tank and the arm first direction switching valve; and
an arm second tank oil passage connecting the tank and the arm second direction switching valve,
wherein when the arm first rod oil passage is connected to the arm first tank oil passage, the arm first direction switching valve connects the arm first pump oil passage to the arm first bottom oil passage, and enables oil to be supplied from the arm first rod oil passage to the arm first bottom oil passage through the arm regeneration passage, and
the controller operates the arm second direction switching valve such that the arm second bottom oil passage and the arm second rod oil passage are blocked, respectively, when determining that oil flow through the arm regeneration passage is possible, and operates the arm second direction switching valve such that the arm second bottom oil passage is connected to the arm second pump oil passage and the arm second rod oil passage is connected to the arm second tank oil passage when determining that oil flow through the arm regeneration passage is not possible.