Apparatus for controlling an amount of fluid for heavy construction equipment
AssigneeVolvo Construction Equipment Holding Sweden AB
InventorHae Kyun Joung
Life of this patent
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Abstract
A set amount of fluid can be constantly supplied to an actuator and a flow-back of fluid from the actuator can be prevented, even in case of developing variations of a load pressure of the actuator and a pressure of a hydraulic pump, and provided is a control valve for controlling the driving of the actuator connected to the hydraulic pump, a logic check valve mounted in a path between the hydraulic pump and the control valve to be opened and shut, and a logic control valve mounted between the hydraulic pump and the pressure chamber of the logic check valve and for controlling an amount of fluid passing through the upper side of the logic check valve from the hydraulic pump upon switching.
Claims7
An apparatus for controlling an amount of fluid for heavy construction equipment having a hydraulic pump, an actuator connected to the hydraulic pump and driven upon hydraulic fluid supplies, and a control valve installed in a parallel fluid path between the hydraulic pump and the actuator and for controlling starts, stops, and direction switchings of the actuator, comprising:
- a logic control valve for opening and shutting an inlet-side path communicated with the parallel path and an outlet-side path connected to a pressure chamber of the logic check valve upon switching based on a set elastic force of a valve spring and a pressure in a path on a side of the actuator connected to one side of the pressure chamber with respect to a pressure in an inlet-side path connected to the other side of the pressure chamber.
Dependencies are inferred from the claim text.