Uchida Rexroth Pump A8VO Series A8VO55 A8VO80 A8VO107 A8VO120 A8VO140 A8VO160 A8VO200 Hydraulic Piston Pump

• Pump for direct mounting on the flywheel case in diesel engines
• Compact unit
• Power take-off for mounting gear pumps and axial piston pumps in parallel to the main pumps
• Long service life
• Load-sensing control
• Integrated auxiliary pump with pressure relief valve, optionally with additional pressure reducing valve
• High power density
• Hydraulic stroke limitation
• Individual power controller with power override and hydraulic coupling
• Bent-axis design

1) These values are valid at an absolute pressure of 1 bar in suction port S and for the optimum viscosity range νopt
2) Please note limitation of technical data (Vg < Vg max or p < pnom)

Control device

LA0, LA1 - Individual Power Controller

On the variable double pump with individual power controller LA0/LA1, the two rotary groups are not mechanically coupled,
i.e. each rotary group is fitted with a separate power controller.
The power controller controls the displacement of the pump depending on the operating pressure so that a defined input power is not exceeded.
The power setting is adjusted individually for each control and can be different; each pump can be set to 100% input power.
The hyperbolic power characteristic is approximated using two measuring springs. The operating pressure acts on the measuring surfaces of a differential piston against the measuring springs and an externally adjustable spring force, which determines the power setting.
If the sum of the hydraulic forces exceeds the spring forces, control fluid is supplied to the control piston, which swivels the pump back to reduce the flow.
When not under pressure, the pump is swiveled back to its initial position at Vg max by a return spring.

EP Electric Control with Proportional Solenoids

With the electric control with proportional solenoid, the pump displacement is adjusted proportionally and steplessly to the current by means of the magnetic force.
Control from Vg min to Vg max
With increasing control current the pump swivels to a larger displacement.
Initial position without control signal (control current): Vg min
The required control pressure is taken either from the operating pressure or from the externally applied control pressure at port Y3.
To ensure the control even at low operating pressure < 30 bar, the port Y3 must be supplied with an external control pressure of approx. 30 bar.

A8VO