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Axial piston unit 01 Bent-axis design, variable, nominal pressure bar, maximum pressure bar. Connector for solenoids see page 33 Without connector without solenoid, only with hydraulic controls; without code DEUTSCH - molded connector, 2 pin — without suppressor diode1.
The correct choise of hydraulic fluid requires knowledge of the operating temperature in relation to the ambient temperature: in an open circuit the reservoir temperature. We recommended that the higher viscosity class be selected in each case.
Note The case drain temperature, which is affected by pressure and speed, can be higher than the reservoir temperature. The temperature difference specified below is to be taken into account when determining the viscosity in the bearing. If the above conditions cannot be maintained due to extreme operating parameters, we recommend flushing the case at port U. The bearing temperature can be reduced by flushing via port U. Finer filtration improves the cleanliness level of the hydraulic fluid, which increases the service life of the axial piston unit.
To ensure the functional reliability of the axial piston unit, a gravimetric analysis of the hydraulic fluid is necessary to determine the amount of solid contaminant and to determine the cleanliness level according to ISO If the above classes cannot be achieved, please contact us.
The service life of the shaft seal is influenced by the speed of the axial piston unit and the case drain pressure case pressure. The mean pressure difference of 2 bar between the case and the ambient pressure may not be enduringly exceeded at normal operating temperature.
For a higher pressure difference at reduced speed, see diagram. The service life of the shaft seal decreases with an increase in the frequency of pressure spikes. The case pressure must be equal to or higher than the ambient pressure.
The case drain chamber is connected to the suction chamber. A case drain line from the case to the reservoir is not required both ports "R" are plugged. For versions with pressure controller or pressure cut-off, a case drain line for discharge from port T1 to the reservoir is absolutely essential. State NBR shaft seal in plain text when ordering. Please contact us. Minimum pressure high-pressure side Minimum pressure at the high-pressure side A or B which is required in order to prevent damage to the axial piston unit.
Minimum pressure Inlet Minimum pressure at suction port S inlet which is required in order to prevent damage to the axial piston unit. The minimum pressure is dependent on the speed and displacement of the axial piston unit see diagram on page 7.
Maximum pressure pmax The maximum pressure corresponds to the maximum operating pressure within the single operating period. The sum of the single operating periods must not exceed the total operating period. Rate of pressure change RA Maximum permissible rate of pressure rise and reduction during a pressure change over the entire pressure range. Time t. Technical data Table of values theoretical values, without efficiency and tolerances; values rounded Size.
Other permissible limit values, with respect to speed variation, reduced angular acceleration as a function of the frequency and the permissible start up angular acceleration lower than the maximum angular acceleration can be found in data sheet RE Determining the operating characteristies Flow.
Maximum permissible axial force during standstill or when the axial piston unit is operating in non-pressurized condition. Recommended position of mating gear is dependent on direction of rotation. Example: Toothed gear drive. The operating pressure acts on a rocker via a measuring piston. An externally adjustable spring force counteracts this, it determines the power setting. If the operating pressure exceeds the set spring force, the control valve is actuated by the rocker, the pump swivels back direction Vg min.
The power controller regulates the displacement of the pump depending on the operating pressure so that a given drive power is not exceeded at constant drive speed. When depressurized, the pump is swiveled to its initial position Vg max by a return spring. LR — Power controller The pressure cut-off corresponds to a pressure control which adjusts the pump displacement back to Vg min, when the pressure setting is reached. This function overrides the power control, i. The pressure cut-off is preset to a specified value at the factory.
Note — The pressure setting for the pressure cut-off must be at least a factor of 5 higher than the beginning of control of the power control. The hydraulic stroke limiter, the displacement of the pump can be continuously varied or limited over the entire allowable range. The displacement is set proportionally by the pilot pressure pSt maximum 40 bar applied at port X1.
The power controller overrides the hydraulic stroke limiter, i. When exceeding the power characteristic with a set flow or operating pressure, the power control overrides and reduces the displacement following the hyperbolic characteristic. A control pressure of 40 bar is required to swivel the pump from its initial position Vg max to Vg min.
The necessary control power is taken from the operating pressure or the external control pressure applied to port Y3. Control from Vg max to Vg min With increasing pilot pressure the pump swivels to a smaller displacement. Initial position without control signal pilot pressure : Vg max. DR — Pressure controller The pressure controller limits the maximum pressure at the pump outlet within the control range of the pump.
The variable pump only moves as much hydraulic fluid as is required by the consumers. If the operating pressure exceeds the setpoint value set at the integral pressure valve, the pump control will shift toward a smaller displacement and the control deviation will decrease.
Note — On versions with DR controller, a case drain line from port T1 to the reservoir is essential. Zero stroke operation The standard pump unit is designed for intermittent, constantpressure operation.
In the case of longer zero-stroke operation, the bearings should be flushed by way of the flushing port U. Flow port. DR — Pressure controller DRG — Pressure controller remotely controlled A separate sequence valve with port plate provides the pressure control functionality.
The valve is mounted away from the pump, whereby the length of the line should not exceed 5 m. The valve is supplied with high pressure from port A1 of the pump. The control power of the valve is returned to the pump via port X3 which retards the pump down to Vg min. Care should be taken that the ports T on the sequence valve and T1 on the pump are connected to the reservoir cooler.
Note — On versions with DRG controller, a case drain line from port T1 to the reservoir is essential. The flow of the pump depends here on the cross section of the external sensing orifice 1 fitted between the pump and the consumer. Below the setting for the pressure control and within the control range of the pump, the flow is independent of load pressure. The sensing orifice is usually a separately mounted loadsensing directional valve control block.
The position of the directional valve piston determines the opening cross section of the sensing orifice and thus the flow of the pump.
The load sensing controller is a flow control option that operates as a function of the load pressure to regulate the pump displacement to match the consumer flow requirement. The pressure controller overrides the load sensing controller, i. A control pressure of 40 bar is required to swivel the pump from its initial position Vg min to Vg max. The controller can stick in an undefined position by internal contamination contaminated hydraulic fluid, abrasion or residual contamination from system components.
As a result, the control will no longer respond correctly to the operator's commands. Check whether the application on your machine requires additional safety measures, in order to bring the driven actuator into a controlled and safe position e. HD — Proportional control hydraulic HD. G — Hydraulic control with pressure cut-off, remotely controlled A separate sequence valve with port plate provides the pressure cut-off functionality.
By way of port X3 the control power of the pump is transmitted to the valve and into the reservoir at port A of the port plate of the sequence valve whereby the pump is retarded to Vg min, if the target pressure value is exceeded. Please state the pressure cut-off setting in plain text when ordering. Note — Port A of the sequence valve must be connected to the reservoir cooler. Sequence valve and port plate must be ordered separately. R X1. EP — Proportional control electric The proportional electric control provides infinite adjustment of the displacement, proportional to the control current applied to the solenoid.
Adjustment from Vg min to Vg max positive control With increasing control current the pump swivels to a higher displacement. Characteristic EP2 positive control. Dimensions size 28 LR — Power controller Note: All versions of the controller are illustrated for clockwise direction of rotation View Y. Center bore according to DIN thread according to DIN 13 Observe the general instructions on page 36 for the maximum tightening torques.
Momentary pressure spikes may occur depending on the application. Keep this in mind when selecting measuring devices and fittings. Only dimensions according to SAE J, metric fastening thread is a deviation from standard. The spot face can be deeper than specified in the appropriate standard. Proportional control hydraulic, positive control and variants with pressure cut-off, remotely controlled.
Proportional control electric, positive control and variants with pressure cut-off, remotely controlled. Dimensions size 55 LR — Power controller Note: All versions of the controller are illustrated for clockwise direction of rotation View Y. Proportional control electric, positive control and variants with pressure cut-off, remotely controlled Dimensions size 80 LR — Power controller Note: All versions of the controller are illustrated for clockwise direction of rotation View Y.
Dimensions size LR — Power controller Note: All versions of the controller are illustrated for clockwise direction of rotation View Y. This can be supplied by Bosch Rexroth on request.
To do this, proceed as follows: 1. Loosen the mounting nut 1 of the solenoid.
Bosch Rexroth A7VO Axial Piston Pump – Series 63
It has a bent axis tapered piston transmission and is designed for open circuit hydrostatic drives in mobile and industrial applications. Flow is proportional to the drive speed and displacement. By adjusting the bent axis, the flow can be changed seamlessly. Contact us for further technical details and multiple pump configuration options. This is a system generated translation and as such will not be fully accurate.
Rexroth Axial Piston Variable Pump A7VO
Axial piston unit 01 Bent-axis design, variable, nominal pressure bar, maximum pressure bar. Connector for solenoids see page 33 Without connector without solenoid, only with hydraulic controls; without code DEUTSCH - molded connector, 2 pin — without suppressor diode1. The correct choise of hydraulic fluid requires knowledge of the operating temperature in relation to the ambient temperature: in an open circuit the reservoir temperature. We recommended that the higher viscosity class be selected in each case.