US 11,306,746 B2 · Hydraulic system for working machine

Abstract

A hydraulic system for a working machine includes a hydraulic actuator having a first fluid chamber and a second fluid chamber, an accumulator, an outputting fluid tube to output an operation fluid, and a switching valve to be switched between a first position and a second position. The first position allows the first fluid chamber and the second fluid chamber to be communicated with the outputting fluid tube and thereby allowing a floating operation. The second position allows the first fluid chamber and the accumulator to be communicated with each other, allows the second fluid chamber and the outputting fluid tube to be communicated with each other, and thereby allows an anti-vibration operation.

Claims12

Dependent claims

A hydraulic system for a working machine, comprising:

a hydraulic actuator;
a float switching valve to perform a floating operation of the hydraulic actuator;
an anti-vibration switching valve to perform an anti-vibration operation of the hydraulic actuator;
a control device to stop the anti-vibration operation performed by the anti-vibration switching valve when the float switching valve performs the floating operation;
a first switch connected to the control device and configured to issue a first command of the floating operation;
and
a second switch connected to the control device and configured to issue a second command of the floating operation,
wherein when the control device receives the second command, the control device initiates the anti-vibration operation by the anti-vibration switching valve;
when the control device receives the first command while the second command is already being received, the control device stops the anti-vibration operation.

6 more elements

A hydraulic system for a working machine, comprising:

a hydraulic actuator;
a float switching valve to perform a floating operation of the hydraulic actuator;
and
an anti-vibration switching valve to perform an anti-vibration operation of the hydraulic actuator;
wherein the float switching valve or the anti-vibration switching valve includes:
a solenoid valve to which the operation fluid serving as a pilot fluid is supplied;
a pressure-receiving portion to receive the pilot fluid from the solenoid valve;
an inner fluid tube to connect the solenoid valve to the pressure-receiving portion;
and
an outputting fluid tube branched from the inner fluid tube, the outputting fluid tube being configured to drain the pilot fluid from the pressure-receiving portion.

7 more elements

A hydraulic system for a working machine, comprising:

a hydraulic actuator;
a float switching valve to perform a floating operation of the hydraulic actuator;
and
an anti-vibration switching valve to perform an anti-vibration operation of the hydraulic actuator,
wherein the float switching valve or the anti-vibration switching valve includes:
a solenoid valve to which pilot fluid is supplied;
a pressure-receiving portion to receive of the pilot fluid from the solenoid valve;
a spool;
and
an outputting port,
wherein the spool includes an outputting portion, and
the outputting portion connects the pressure-receiving portion to the outputting port, and drains the pilot fluid in the pressure-receiving portion through the outputting port.

9 more elements

Dependencies are inferred from the claim text.

Hydraulic system for working machine

Life of this patent

Hydraulic system for working machine

Life of this patent

Abstract

Claims12