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

Claim 5:
6. The hydraulic system according to claim 5, further comprising:
a boom first bottom oil passage connecting the bottom chamber of the boom hydraulic cylinder and the boom first direction switching valve;
a boom second bottom oil passage connecting the bottom chamber of the boom hydraulic cylinder and the boom second direction switching valve;
a boom first rod oil passage connecting the rod chamber of the boom hydraulic cylinder and the boom first direction switching valve;
a boom second rod oil passage connecting the rod chamber of the boom hydraulic cylinder and the boom second direction switching valve;
a boom second pump oil passage connecting the second hydraulic pump and the boom second direction switching valve;
a boom first tank oil passage connecting the tank and the boom first direction switching valve; and
a boom second tank oil passage connecting the tank and the boom second direction switching valve,
wherein when the boom first bottom oil passage is connected to the boom first tank oil passage, the boom first direction switching valve enables oil to be supplied from the boom first bottom oil passage to the boom first rod oil passage through the boom regeneration passage, and
the controller operates the boom second direction switching valve such that the boom second bottom oil passage and the boom second rod oil passage are blocked, respectively, when determining that oil flow through the boom regeneration passage is possible, and operates the boom second direction switching valve such that the boom second rod oil passage is connected to the boom second pump oil passage and the boom second bottom oil passage is connected to the boom second tank oil passage when determining that oil flow through the boom regeneration passage is not possible.