Rexroth A10VO series variable piston pump structure description

Create Date: 2024-8-30 12:03:23|Source: Rexroth/Rexroth

A10VO series variable piston pump is one of Rexroth variable piston pumps, A10VO series is Rexroth medium pressure series swash plate axial piston pump, nominal pressure 280bar, used in open hydraulic circuits, the pump is widely used, is used in various fields, including but not limited to gantry planers, broaching machines, hydraulic presses, construction machinery, etc
Rexroth A10VO series variable piston pump structure description
  1. Rexroth A10VSODFR piston pump structure

The A10VO variable pump is mainly composed of a pump body, a swash plate, a return piston, a return spring, a variable piston and a control valve group. The pump is initially in the maximum displacement under the effect of spring force, and when the flow control valve FR or pressure valve DR acts, the variable plunger pushes the swash plate to make corresponding actions to achieve the purpose of variable displacement.

2. Rexroth A10VSODFR working principle of piston pump

At the beginning, the saving valve is closed, when the pump outlet pressure reaches the set pressure of the flow control valve, the flow control valve FR valve spool moves to the left, the hydraulic oil enters the right end of the variable plunger, and the swash plate is pushed down to zero inclination orientation, the displacement of the pump is the smallest at this moment, and the flow rate of the pump only adheres to the variable demand of the pump at this moment.

When the opening of the saving valve increases, the pressure of the B port decreases instantaneously, the flow control valve FR valve spool moves to the right, the right chamber of the variable plunger discharges oil, the swash plate increases the inclination angle under the effect of the reset plunger, the displacement of the pump increases, with the increase of the flow rate, the pressure difference between the two ends of the saving valve tends to be constant under the effect of the pressure compensation valve FR, the pressure difference between the B port and the X port tends to be constant, and the flow control valve FR valve spool also reaches the equilibrium state, when the reconditioning saving port opening or load pressure changes, the FR valve core will act again to regulate the flow of the pump, and then adhere to the balance.

When the system pressure is higher than the set pressure of the DR valve, the valve core of the DR valve moves to the left position, and the pressure of the B port leads to the rodless cavity of the variable piston through the DR valve, and the swash plate is pushed to the direction of zero inclination, and the flow rate of the pump is simply zero, and the flow rate only adheres to the variable demand of the pump

3. Rexroth A10VSODFR pressure and flow adjustment method of piston pump

1) Flow conditioning

The X port is connected to the oil tank to relieve the pressure, and the B port is closed, and the pressure reaches the required pressure by rotating the conditioning screw on the FR of the flow control valve, and the general FR setting value is between 14 Bar and 22 Bar

2) Highest pressure conditioning

Close the flow control valve FR, block the B port, detect and adjust the DR pressure to the required pressure by means of a pressure conditioning screw, but this pressure must be less than the safe pressure of the piston pump 280 bar

3) Used as a constant pressure variable pump

By tightening the bolts of the FR to the bottom, the pressure compensation valve FR is ineffective and can be used as a constant pressure variable pump.

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