Bosch Rexroth AA20VFO AA20VNO variable double hydraulic pump

The key to the A20VFO (with charge pump) and A20VNO (without charge pump) lies in their "back-to-back" design. This configuration houses two independent rotary groups within a single housing. This double pump approach offers significant advantages over using two separate single pumps:

Reduced Footprint: Saves valuable installation space on the prime mover.

Simplified Drive Train: Utilizes a single drive shaft, eliminating the need for complex gearboxes or multiple pump drives.

Optimized Mounting: Typically conforms to SAE J744 or SAE J617 (flywheel housing) standards, ensuring compatibility with industrial combustion engines.

Application Scenarios and System Integration

The strength of the AA20VFO/AA20VNO is its ability to power two distinct hydraulic circuits independently. This is critical in applications where multiple, simultaneous functions are required.

Mobile Machinery: Tracked Vehicles and Drilling Rigs

In tracked excavators or mobile drilling rigs, one side of the pump can be dedicated to the left track drive while the other powers the right track. This allows for precise, independent control of traction (steering) while the engine operates at optimal RPM. Alternatively, one section can power the travel drives while the other supplies the implement circuit (e.g., the slew drive or boom functions), providing high levels of flexibility without needing a complex valve bank to split flow from a single pump.

Industrial Presses and Test Rigs

In industrial settings, the double pump configuration is invaluable for high-pressure test rigs or large presses. One section can provide high flow for rapid approach speeds (low pressure), while the second section can be switched to provide the high-pressure, low-flow requirements for the pressing or holding phase, optimizing energy consumption. The robust construction and high-pressure capacity of 350 bar continuous (400 bar short-term) make it ideal for these demanding scenarios.

Control Options and Expert Considerations

For the engineer, the value of the A20VO series is greatly enhanced by its control options. The documentation refers to the control unit code "LRDU2" among others, indicating the availability of various hydraulic and electronic displacement controls.

Flexible Control: The ability to choose from different control variants allows the system designer to tailor the pump's response to specific machine logic—whether that's load-sensing for fuel efficiency, pressure-cutoff for safety, or electronic proportional control for integration into modern machine control systems (e.g., ISO 11783).

Operational Safety: Given that these pumps generate significant power, the documentation rightly emphasizes safety. The pump and solenoids can reach high surface temperatures, presenting a burn hazard, and all projections, planning, and commissioning must be carried out by trained personnel. Proper design of the suction line is also critical; performance data assumes an absolute inlet pressure of at least 0.8 bar (for mineral oil) to prevent performance degradation and damage from cavitation.

For more information on the AA20VNO/AA20VFO hydraulic pump, please visit https://www.baolilaihydraulic.com/product/.

Specifications

Selection Table

Q1: What is the primary difference between the AA20VFO and AA20VNO?

A1: The distinction lies in the charge (or boost) pump. The AA20VFO variant includes a built-in charge pump, primarily to ensure adequate inlet pressure to the main pump, which is particularly useful in suction-lift applications or with high-viscosity fluids. The AA20VNO omits this charge pump, relying instead on a well-designed, pressurized inlet (such as from a separate feed pump or a pressurized reservoir). The choice depends on the specific system layout and inlet conditions.

Q2: What types of drive shafts are available for this pump?

A2: To suit different engine flywheels or gearbox interfaces, the pump is typically offered with a splined shaft. The options include a splined shaft according to DIN 5480 (metric standard) or an ANSI B92.1a-1976 shaft (American standard), providing global compatibility.

Q3:How to purchase an AA20VNO/AA20VFO hydraulic pump?

A3:You can visit https://www.baolilaihydraulic.com/contact/ to contact us and purchase our products through various methods.

Q4:What is the price and delivery time of the AA20VNO/AA20VFO hydraulic pump?

A4:The specific price and delivery time will be provided based on the specific model you provide.