Rexroth A2FO Fixed displacement axial piston hydraulic pump

The Rexroth A2FO epitomizes the principle of mechanical elegance through purpose-driven design. As a fixed-displacement axial piston pump, its core operation is defined by a non-adjustable swashplate angle. This singular feature dictates a constant fluid volume output per shaft revolution, making volumetric flow directly proportional to drive speed. The resulting mechanical simplicity eliminates the complex control mechanisms found in variable pumps, thereby establishing a foundation for exceptional durability, predictable performance, and reduced maintenance requirements in continuous-duty applications.

Deconstructing the Mechanism: Core Components and Synergy

The pump’s reliable operation is a product of three precision components forming an integrated kinematic chain.

1. Rotating Group (Cylinder Block & Piston Assembly): This is the pump’s beating heart. An odd number of pistons—typically seven or nine—are housed in precision-machined bores within a cylinder block that rotates with the drive shaft. The odd count is a deliberate design choice that optimizes flow continuity and minimizes pressure pulsation.
2. Fixed Swashplate: This is the static, angled cam that defines the pump’s displacement. As the rotating group turns, the slipper pads at the end of each piston ride against the swashplate’s angled surface. This converts the shaft’s pure rotation into the precise reciprocating stroke of the pistons.
3. Valve Plate (Port Plate): This critical stationary interface manages the hydraulic cycle. It features two kidney-shaped ports that align with the bores in the rotating cylinder block. Its precise timing allows each piston to draw in fluid from the inlet port during its retraction stroke and expel high-pressure fluid to the outlet port during its extension stroke.

Application in Context: Consider a high-inertia gearbox lubrication system for a mining conveyor. The A2FO’s inherently smooth, pulsation-optimized flow ensures a consistent, high-pressure oil film is maintained across bearing surfaces. This predictable performance is non-negotiable for preventing catastrophic adhesive wear under extreme shock loads, where a fluctuating oil supply could lead to rapid component failure.

Performance DNA: Where Robustness Meets Efficiency

Far from a basic component, the A2FO is a refined system engineered for peak operational economy and resilience.

Optimized for Power Density and Energy Economy

Designed to global SAE and DIN/ISO mounting standards, the A2FO achieves a high power-to-size ratio. Its efficiency is a result of meticulous engineering: optimized clearances reduce volumetric losses (internal slippage), while advanced bearing and slipper pad designs minimize mechanical friction. This dual-focus on hydraulic and mechanical efficiency directly translates to lower operational energy costs and reduced thermal stress on the hydraulic system, enabling cooler, more stable continuous operation.

Built for Endurance in Severe-Duty Cycles

The A2FO is engineered to thrive where others falter. Key models are rated for continuous pressures up to 350 bar (~5,075 psi), with a robust construction that tolerates real-world system dynamics. Its inherent tolerance to fluid contamination—within specified ISO cleanliness codes—makes it a stalwart in harsh environments. This durability profile makes it ideal for the constant vibration in a metal stamping press, the abrasive atmospheres of a foundry, or the corrosive, saline conditions encountered in marine hydraulics.

Strategic Deployment: Ideal Application Landscapes

The A2FO’s value proposition is clearest in systems where a constant, unwavering source of hydraulic power is a fundamental requirement.

• Industrial Hydraulic Power Units (HPUs): Serves as the prime mover in fixed-speed HPUs for machine tools, plastics processing equipment, and automated assembly lines.

• Constant-Volume Drives: Powers conveyor systems, roller presses, and mixer drives where motor speed control is managed elsewhere in the circuit.

• Mobile Machinery (Auxiliary Functions): An excellent choice for fan drives, winches, and lubrication pumps on construction and agricultural equipment, where a constant flow from a dedicated power take-off (PTO) is optimal.

• Marine & Offshore Systems: Provides reliable hydraulic power for deck machinery, windlasses, and auxiliary steering systems, prized for its seawater-environment resilience.

• Test and Simulation Rigs: Delivers the precise, repeatable base flow required for material testing machines and component fatigue test stands.

Expert System-Design Perspective: The choice between a fixed and variable displacement pump is a fundamental system design decision. While a pump like the Rexroth A10VG excels in demand-sensing systems requiring adaptive flow and power-limiting control, the A2FO is strategically superior in applications defined by a constant speed-power relationship. Here, its fewer moving parts, absence of complex control valves, and robust construction typically yield a higher Mean Time Between Failures (MTBF). This reliability, coupled with lower initial cost and simplified maintenance, directly reduces the Total Cost of Ownership (TCO) over the asset's lifecycle, making it the intelligent, performance-proven choice for continuous process applications.

For more information on the A2FO hydraulic pump, please visit https://www.baolilaihydraulic.com/.

Specifications

Selection Table

Q1: What is the primary difference between a fixed displacement (A2FO) and a variable displacement axial piston pump?

A1:The core difference is controllability. An A2FO delivers a constant flow per revolution; you must change the pump's drive speed to alter flow. A variable displacement pump can modulate its flow output (via a movable swashplate or compensator) at a constant drive speed, offering on-demand, energy-efficient control.

Q2:What are the critical considerations for specifying and installing an A2FO pump?

A2:Shaft Load:​ Adherence to specified radial and axial shaft load limits is paramount to prevent premature bearing wear.

Case Drain:​ Proper case drain line configuration, with minimal backpressure, is essential for long service life.

Fluid Cleanliness:​ Maintaining the target fluid cleanliness level (e.g., ISO 4406 19/17/14 or better) is the most effective way to maximize its operational lifespan.

Supercharge (Inlet Pressure):​ Ensuring adequate and stable inlet pressure (typically 0.8-1.2 bar absolute minimum) is critical to prevent cavitation and subsequent damage.

Q3:How to purchase an A2FO hydraulic pump?

A3:You can click on the right sidebar or the contact information in the top bar to contact us to purchase. You can do so via email, form, WeChat, WhatsApp, or other methods.

Q4:What is the price and delivery time of the A2FO hydraulic pump?

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