US 10,767,346 B2 · Work machine

Abstract

A work machine includes a hydraulic actuator configured to be driven via hydraulic oil. A control valve has a first pilot port and is connected to the hydraulic actuator to control the hydraulic actuator. The hydraulic actuator is configured to move in a first mode when a first pilot pressure is applied to the first pilot port. A first pilot valve is connected to the first pilot port of the control valve via the first pilot oil supply pipe to control applying the first pilot pressure to the first pilot port. The hydraulic oil is configured to be drained via a drain pipe. The drain pipe and the first pilot oil supply pipe are provided in a heat exchanger to exchange heat between the hydraulic oil in the drain pipe and the hydraulic oil in the first pilot oil supply pipe via the heat exchanger.

Claims22

Dependent claims

A work machine comprising:

a hydraulic actuator configured to be driven via hydraulic oil;
a control valve having a first pilot port and connected to the hydraulic actuator to control the hydraulic actuator, the hydraulic actuator being configured to move in a first mode when a first pilot pressure is applied to the first pilot port;
a first pilot oil supply pipe;
a first pilot valve connected to the first pilot port of the control valve via the first pilot oil supply pipe to control applying the first pilot pressure to the first pilot port;
a drain pipe via which the hydraulic oil is configured to be drained;
and
a heat exchanger in which the drain pipe and the first pilot oil supply pipe are provided to exchange heat between the hydraulic oil in the drain pipe and the hydraulic oil in the first pilot oil supply pipe via the heat exchanger.

4 more elements

Dependencies are inferred from the claim text.

Work machine

Life of this patent

Work machine

Life of this patent

Abstract

Claims22