Hydraulic drive system and construction machine
AssigneeNabtesco Corporation
InventorEtsuro Komori
Life of this patent
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Abstract
The hydraulic drive system includes a hydraulic pump, a plurality of variable displacement actuators, and a control unit. The hydraulic pump discharges a hydraulic fluid. The variable displacement actuators each receive a pressure of the hydraulic fluid discharged from the hydraulic pump to operate corresponding one of a plurality of drive parts. The control unit controls displacement varying parts of the variable displacement actuators. The control unit controls the displacement varying parts of the variable displacement actuators, based on sensed pressures in fluid inflow parts of the variable displacement actuators in operation, such that the pressures in the fluid inflow parts of the variable displacement actuators in operation approach a common target pressure.
Claims6
A hydraulic drive system, comprising:
- a hydraulic pump configured to discharge a hydraulic fluid;
- a plurality of variable displacement actuators each configured to receive a pressure of the hydraulic fluid discharged from the hydraulic pump to operate a corresponding one of a plurality of drive parts;
- and
- a control unit configured to control respective displacement varying parts of the plurality of variable displacement actuators,
- wherein the control unit is configured to:
- acquire a common target pressure that is predetermined and common to the plurality of variable displacement actuators, and
- control the displacement varying parts of the variable displacement actuators, based on sensed pressures in fluid inflow parts of the variable displacement actuators in operation among the plurality of variable displacement actuators, such that the pressures in the fluid inflow parts of the variable displacement actuators in operation approach the acquired common target pressure that is common to the plurality of variable displacement actuators.
A construction machine, comprising:
- a plurality of drive parts;
- and
- a hydraulic drive system configured to receive a pressure of a hydraulic fluid to operate the plurality of drive parts,
- wherein the hydraulic drive system includes:
- a hydraulic pump configured to discharge the hydraulic fluid;
- a plurality of variable displacement actuators each configured to receive a pressure of the hydraulic fluid discharged from the hydraulic pump to operate a corresponding one of the plurality of drive parts;
- and
- a control unit configured to control respective displacement varying parts of the plurality of variable displacement actuators,
- wherein the control unit is configured to:
- acquire a common target pressure that is predetermined and common to the plurality of variable displacement actuators, and
- control the displacement varying parts of the variable displacement actuators, based on sensed pressures in fluid inflow parts of the variable displacement actuators in operation among the plurality of variable displacement actuators, such that the pressures in the fluid inflow parts of the variable displacement actuators in operation approach the acquired common target pressure that is common to the plurality of variable displacement actuators.
Dependencies are inferred from the claim text.