Hydraulic excavator

摘要

There is provided a hydraulic excavator in which occurrence of minute vibrations in a control lever can be suppressed. The hydraulic excavator includes: a first pilot pressure control valve outputting a pilot pressure in accordance with operation of the control lever; an upstream pilot conduit having one end connected to the first pilot pressure control valve; a proportional solenoid valve connected to the other end of the upstream pilot conduit; a downstream pilot conduit having one end connected to the proportional solenoid valve; and a pilot switching valve for a boom having a second pilot port connected to the other end of the downstream pilot conduit, and controlling operation of the boom. A volume of the upstream pilot conduit is larger than a volume of the downstream pilot conduit.

主权项

1. A hydraulic excavator, comprising:
a boom; a control lever operated by an operator; a pilot pressure control valve outputting a pilot pressure in accordance with operation of said control lever; an upstream pilot conduit having one end connected to said pilot pressure control valve; a proportional solenoid valve connected to another end of said upstream pilot conduit; a downstream pilot conduit having one end connected to said proportional solenoid valve; and a pilot switching valve having a boom-lowering pilot port connected to another end of said downstream pilot conduit, and controlling operation of said boom, wherein a volume of said upstream pilot conduit is larger than a volume of said downstream pilot conduit.