A4FO22, A4FO28,Fixed Displacement Pump/Motor
3 week ago
Product details
A4FO22 and A4FO28 Fixed Displacement Pumps/Motors: Detailed Overview
I. Product Positioning and Core Features
The A4FO22 and A4FO22 are axial piston fixed displacement pumps from Rexroth's A4FO series, featuring a swashplate design tailored for open-circuit hydraulic systems. Their key characteristics include:
1. Flow Proportional to Speed/Displacement: Output flow is determined by drive speed and pump displacement, ideal for applications requiring stable flow rates.
2. High-Pressure Performance:
• A4FO22/28: Rated pressure of 400 bar, peak pressure of 450 bar, meeting high-load demands.
3. Low Noise and Long Service Life: Optimized design reduces operational noise, while wear-resistant components extend durability.
4. Multi-Pump Compatibility: Supports series or parallel configurations for complex hydraulic systems.
5. Through-Shaft Drive: Enables integration of additional pumps or motors, simplifying system layout.
II. Technical Parameter Comparison
【表格】
Parameter A4FO22 A4FO28
Displacement (cm³/rev) 22 28
Rated Pressure (bar) 400 400
Peak Pressure (bar) 450 450
Max. Speed (rpm) 3,600 3,000
Flow Range (L/min) 79 (at rated speed) 84 (at rated speed)
Power Range (kW) 53 (at rated speed) 56 (at rated speed)
Torque (Nm) 140 178
Weight (kg) 13.5 13.5
III. Typical Applications
1. Construction Machinery:
• Concrete Pump Trucks: Drives hydraulic cylinders for concrete delivery.
• Cranes: Controls lifting, luffing, and slewing motions.
• Excavators: Powers auxiliary hydraulic systems for bucket and boom operations.
2. Industrial Equipment:
• Injection Molding Machines: Provides high-pressure hydraulic power for precise molding.
• Metal Die-Casting Machines: Manages mold opening/closing and product ejection.
3. Other Fields:
• Marine Steering Gear: Supplies stable steering force.
• Wind Turbine Yaw Systems: Drives gearboxes for nacelle orientation adjustments.
IV. Selection Guidelines
1. Flow Requirements:
• For systems requiring ≤79 L/min, prioritize the A4FO22.
• For flows near 84 L/min, the A4FO28 is more suitable.
2. Pressure Matching:
• Both share the same rated pressure, but the A4FO28 delivers higher torque at equivalent speeds, making it ideal for heavy-duty applications.
3. Speed Limitations:
• The A4FO22 supports speeds up to 3,600 rpm (suited for high-speed drives), while the A4FO28 is capped at 3,000 rpm—ensure system speeds do not exceed limits.
4. Installation Space:
• Both have similar weight and dimensions, but the A4FO28’s larger displacement requires verification of installation clearance.
V. Usage Precautions
1. Pre-Startup Oil Filling: The pump housing must be fully filled with hydraulic oil to prevent dry running damage.
2. Low-Speed No-Load Startup: After initial installation or prolonged shutdown, run at low speed without load until system air is purged.
3. Suction Port Pressure: The minimum suction pressure at port S must not fall below 0.8 bar to avoid cavitation.
4. Installation Position:
• If the pump is positioned below the oil tank level, prime the housing via the drain port before startup.
• If installed above the tank level, avoid layouts where the shaft is horizontal with the suction port facing downward.
5. Piping Design:
• Suction or drain lines must maintain a minimum immersion depth of ≥200 mm (relative to the tank’s lowest liquid level).
• Maximum allowable suction line length: ≤800 mm.
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