WORK MACHINE AND HYDRAULIC SYSTEM FOR WORK MACHINE
First Claim
1. A hydraulic system for a work machine, comprising:
- a first hydraulic actuator;
a second hydraulic actuator other than the first hydraulic actuator;
a first control valve to control the first hydraulic actuator;
a second control valve to control the second hydraulic actuator;
a first fluid tube connecting the first hydraulic actuator to the first control valve;
a second fluid tube connecting the second hydraulic actuator to the second control valve;
a level control valve apparatus connected to the first fluid tube and the second fluid tube, the level control valve apparatus being configured to control a leveling operation for the second hydraulic actuator;
an accumulator apparatus connected to the first hydraulic actuator, the accumulator apparatus communicating with the first fluid tube between the level control valve apparatus and the first control valve; and
circuitry configured to control the level control valve apparatus to stop the leveling operation when the accumulator apparatus is in operation.
1 Assignment
0 Petitions
Accused Products
Abstract
A hydraulic system for a work machine includes a first control valve to control a first hydraulic actuator, a second control valve to control a second hydraulic actuator, a first fluid tube connecting the first hydraulic actuator to the first control valve, and a second fluid tube connecting the second hydraulic actuator to the second control valve. A level control valve apparatus is connected to the first fluid tube and the second fluid tube. The level control valve apparatus is configured to control a leveling operation for the second hydraulic actuator. An accumulator apparatus is connected to the first hydraulic actuator. The accumulator apparatus communicates with the first fluid tube between the level control valve apparatus and the first control valve. Circuitry is configured to control the level control valve apparatus to stop the leveling operation when the accumulator apparatus is in operation.
12 Citations
20 Claims
-
1. A hydraulic system for a work machine, comprising:
-
a first hydraulic actuator; a second hydraulic actuator other than the first hydraulic actuator; a first control valve to control the first hydraulic actuator; a second control valve to control the second hydraulic actuator; a first fluid tube connecting the first hydraulic actuator to the first control valve; a second fluid tube connecting the second hydraulic actuator to the second control valve; a level control valve apparatus connected to the first fluid tube and the second fluid tube, the level control valve apparatus being configured to control a leveling operation for the second hydraulic actuator; an accumulator apparatus connected to the first hydraulic actuator, the accumulator apparatus communicating with the first fluid tube between the level control valve apparatus and the first control valve; and circuitry configured to control the level control valve apparatus to stop the leveling operation when the accumulator apparatus is in operation. - View Dependent Claims (2, 3, 9, 13, 17)
-
-
4. A hydraulic system for a work machine, comprising:
-
a first hydraulic actuator; a second hydraulic actuator other than the first hydraulic actuator; a first control valve to control the first hydraulic actuator; a second control valve to control the second hydraulic actuator; a first fluid tube connecting the first hydraulic actuator to the first control valve; a second fluid tube connecting the second hydraulic actuator to the second control valve; a level control valve apparatus connected to the first fluid tube and the second fluid tube, the level control valve apparatus being configured to control a leveling operation for the second hydraulic actuator; an accumulator apparatus connected to the first hydraulic actuator; and a third fluid tube having a first tube end connected to the first hydraulic actuator and a second tube end which is opposite to the first tube end and which is connected to the first fluid tube between the level control valve apparatus and the first control valve. - View Dependent Claims (5, 10, 14, 18)
-
-
6. A hydraulic system for a work machine, comprising:
-
a first hydraulic actuator; a second hydraulic actuator other than the first hydraulic actuator; a first control valve to control the first hydraulic actuator; a second control valve to control the second hydraulic actuator; a first fluid tube connecting the first hydraulic actuator to the first control valve; a second fluid tube connecting the second hydraulic actuator to the second control valve; a level control valve apparatus connected to the first fluid tube and the second fluid tube, the level control valve apparatus being configured to control a leveling operation for the second hydraulic actuator; an accumulator apparatus connected to the first hydraulic actuator and configured to provide an anti-vibration operation to suppress fluctuation of a pressure of the first hydraulic actuator, the accumulator apparatus being configured to switch an operational state between a stopping state to stop the anti-vibration operation, a first operational state to activate both of the leveling operation and the anti-vibration operation, and a second operational state to activate the anti-vibration operation. - View Dependent Claims (11, 15, 19)
-
-
7. A hydraulic system for a work machine, comprising:
-
a first hydraulic actuator having; a first fluid chamber; and a second fluid chamber; a second hydraulic actuator other than the first hydraulic actuator; a first control valve to control the first hydraulic actuator; a second control valve to control the second hydraulic actuator; a first fluid tube connecting the first hydraulic actuator to the first control valve; a second fluid tube connecting the second hydraulic actuator to the second control valve; a level control valve apparatus connected to the first fluid tube and the second fluid tube, the level control valve apparatus being configured to control a leveling operation for the second hydraulic actuator; an accumulator apparatus connected to the first hydraulic actuator and configured to provide an anti-vibration operation to suppress fluctuation of a pressure of the first hydraulic actuator; and a discharge fluid tube connected to the accumulator apparatus, the discharge fluid tube being configured to discharge an operation fluid supplied from the accumulator apparatus, wherein the accumulator apparatus includes; an accumulator; and a ride control valve configured to be switched to; a stopping position to block a connection between the accumulator and the first fluid chamber of the first hydraulic actuator and to block a connection between the discharge fluid tube and the second fluid chamber of the first hydraulic actuator; a first activating position to connect the first fluid chamber to the accumulator and to block the connection between the second fluid chamber and the discharge fluid tube, and thus to activate both of the leveling operation and the anti-vibration operation; and a second activating position to connect the first fluid chamber to the accumulator and to connect the second fluid chamber to the discharge fluid tube, and thus to activate the anti-vibration operation. - View Dependent Claims (12, 16, 20)
-
-
8. A hydraulic system for a work machine, comprising:
-
a first hydraulic actuator; a second hydraulic actuator other than the first hydraulic actuator; and an accumulator apparatus connected to the first hydraulic actuator and configured to provide an anti-vibration operation to suppress fluctuation of a pressure of the first hydraulic actuator, the accumulator apparatus being configured to be switched to; a stopping state to stop the anti-vibration operation; a first activating state to activate both of the second hydraulic actuator and the anti-vibration operation; and a second activating state to activate the anti-vibration operation.
-
Specification