Rexroth Replacement Axial Piston Pump A11V145+145: Detailed Overview
I. Product Overview
The Rexroth Replacement Axial Piston Pump A11V145+145 is a high-performance, dual-pump (tandem or parallel configuration) axial piston variable displacement pump designed by Bosch Rexroth for closed-loop hydraulic systems. Featuring two A11V145 pumps, it delivers enhanced flow or pressure output, making it ideal for applications requiring large flow rates or high pressures, such as construction machinery, marine equipment, and mining systems.
II. Technical Features
1. Variable Displacement Control:
• Supports multiple control methods, including constant pressure control (HD), load-sensing control (LS), and electro-proportional control (EP), enabling precise flow and pressure regulation.
• The variable mechanism adjusts the swashplate angle to modify piston stroke, achieving stepless displacement.
2. Pressure Range:
• Rated Pressure: Typically 300 bar (4,350 psi), meeting the demands of most closed-loop hydraulic systems.
• Peak Pressure: Up to 350 bar (5,100 psi), providing short-term overload capability.
3. Speed Range:
• Maximum Speed: Up to 3,000–4,000 rpm (depending on design), ensuring efficient power transmission.
• Minimum Speed: Typically 500 rpm, ensuring stability at low speeds.
4. Efficiency and Reliability:
• High volumetric and mechanical efficiency, reducing energy loss and heat generation.
• Long service life due to premium materials and manufacturing processes.
5. Advantages of Dual-Pump Configuration:
• Delivers higher combined flow (when pumps are in series) or higher pressure (when pumps are in parallel).
• Enhances system redundancy and reliability; if one pump fails, the other can continue operation.
III. Structural Features
1. Rotating Components:
• Includes pistons, cylinder blocks, and port plates for oil intake and discharge.
• Pistons are made of high-quality materials for wear resistance and sealing.
2. Swashplate and Variable Mechanism:
• Adjustable swashplate angle via variable pistons or servo mechanisms to regulate flow.
• Compact and responsive variable mechanism design.
3. Control Valves:
• Features LS valves (load-sensing), DR valves (pressure cutoff), and others for precise pump control and pressure protection.
• High-precision manufacturing ensures control accuracy and reliability.
4. Sealing and Lubrication:
• Uses premium seals to prevent oil leakage.
• Integrated lubrication system ensures adequate lubrication for all moving parts.
IV. Applications
1. Construction Machinery:
• Used in excavators, loaders, and cranes for driving travel, swing, and digging functions.
• The dual-pump design meets the high flow and pressure demands of large construction equipment.
2. Marine Equipment:
• Powers deck machinery and propulsion systems, providing stable and reliable performance.
• Closed-loop design suits the unique requirements of marine hydraulic systems.
3. Mining Equipment:
• Drives cutting and loading operations in roadheaders and coal miners.
• High pressure and large flow output accommodate harsh mining conditions.
4. Industrial Equipment:
• Used in machine tools, injection molding machines, and die-casting machines for automated control and precise operation.
• Variable control capabilities meet precise flow and pressure adjustment needs.
V. Selection and Usage Considerations
1. Selection Criteria:
• Choose based on system requirements for displacement, pressure rating, and control method.
• Consider speed range, efficiency curves, and compatibility of the dual-pump configuration.
2. Usage Precautions:
• System Cleanliness: Ensure hydraulic system cleanliness to prevent contaminants from entering the pump.
• Oil Quality: Regularly inspect oil quality and replace oil and filters promptly.
• Parameter Adjustment: Adjust pump parameters (e.g., pressure cutoff, load-sensing settings) based on operating conditions.
• Maintenance: Periodically check seals, bearings, and other wear parts for timely replacement.
• Avoid Overloading: Do not operate the pump continuously beyond its rated pressure or flow limits.
