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How does a double – acting axial piston pump work?

by paul•

As a supplier of axial piston pumps, I’m often asked about the inner workings of these remarkable devices, especially the double – acting axial piston pump. In this blog post, I’ll take you through the detailed process of how a double – acting axial piston pump operates, highlighting its key components and the principles behind its functionality. Axial Piston Pump

Understanding the Basics of Axial Piston Pumps

Before delving into the double – acting type, it’s essential to understand the general concept of axial piston pumps. Axial piston pumps are positive – displacement pumps that use pistons arranged parallel to the drive shaft to move fluid. They are widely used in various industrial applications, including hydraulic systems in construction machinery, aerospace equipment, and manufacturing plants, due to their high efficiency, compact design, and ability to handle high pressures.

Key Components of a Double – Acting Axial Piston Pump

A double – acting axial piston pump consists of several critical components, each playing a vital role in its operation:

  1. Drive Shaft: The drive shaft is connected to an external power source, such as an electric motor or an internal combustion engine. It provides the rotational force necessary to drive the pump.
  2. Cylinder Block: The cylinder block is a circular component that contains multiple cylinders arranged in a radial pattern around the drive shaft. Pistons are housed within these cylinders.
  3. Pistons: The pistons are reciprocating elements that move back and forth within the cylinders. In a double – acting pump, each piston is designed to perform work on both its forward and backward strokes, effectively doubling the pumping capacity compared to a single – acting pump.
  4. Swash Plate: The swash plate is an inclined disc that is positioned at an angle to the axis of the drive shaft. As the drive shaft rotates, the cylinder block also rotates, causing the pistons to move in and out of their cylinders due to the interaction with the swash plate. The angle of the swash plate determines the stroke length of the pistons, which in turn affects the pump’s displacement.
  5. Valve Plate: The valve plate is located at the end of the cylinder block. It contains inlet and outlet ports that control the flow of fluid into and out of the cylinders. The valve plate is designed to ensure that the fluid is properly directed during the piston’s strokes.
  6. Slippers: Slippers are attached to the ends of the pistons and slide along the surface of the swash plate. They help to transmit the force from the swash plate to the pistons and reduce friction.

The Working Principle of a Double – Acting Axial Piston Pump

The operation of a double – acting axial piston pump can be divided into two main phases: the suction phase and the discharge phase. Let’s examine each phase in detail:

Suction Phase

  1. Rotation of the Cylinder Block: When the drive shaft starts rotating, it causes the cylinder block to rotate as well. As the cylinder block rotates, the pistons, which are in contact with the swash plate via the slippers, begin to move.
  2. Piston Movement: On one side of the pump, as the piston moves away from the valve plate (outward stroke), the volume inside the cylinder increases. This increase in volume creates a low – pressure area within the cylinder.
  3. Fluid Intake: Due to the low – pressure area, fluid from the reservoir is drawn into the cylinder through the inlet port in the valve plate. The valve plate is designed in such a way that the inlet port is open during this part of the piston’s stroke, allowing the fluid to enter the cylinder smoothly.

Discharge Phase

  1. Continued Rotation: As the cylinder block continues to rotate, the piston on the same side starts moving towards the valve plate (inward stroke). This reduces the volume inside the cylinder, increasing the pressure of the fluid within it.
  2. Fluid Discharge: When the pressure inside the cylinder exceeds the pressure in the outlet port, the fluid is forced out of the cylinder through the outlet port in the valve plate. At the same time, on the other side of the pump, the opposite process occurs. The piston on that side is moving outward, creating a low – pressure area and drawing in fluid, while the piston on the first side is moving inward, discharging fluid.
  3. Continuous Operation: This alternating suction and discharge process occurs simultaneously on both sides of the pump for each piston. As the drive shaft continues to rotate, the pistons keep moving in and out of their cylinders, creating a continuous flow of fluid from the inlet to the outlet of the pump.

Advantages of Double – Acting Axial Piston Pumps

Double – acting axial piston pumps offer several advantages over other types of pumps:

  1. High Efficiency: By utilizing both the forward and backward strokes of the pistons, double – acting pumps can deliver a higher flow rate for a given pump size and speed. This results in improved energy efficiency, as the pump can move more fluid with less input power.
  2. Smooth Flow: The continuous and balanced operation of the double – acting design helps to produce a smoother flow of fluid compared to single – acting pumps. This is particularly important in applications where a consistent flow is required, such as in precision hydraulic systems.
  3. Compact Design: Despite their high performance, double – acting axial piston pumps can be designed to be relatively compact. This makes them suitable for applications where space is limited, such as in mobile equipment.
  4. High Pressure Capability: These pumps are capable of generating high pressures, making them suitable for a wide range of industrial applications, including heavy – duty machinery and high – pressure hydraulic systems.

Applications of Double – Acting Axial Piston Pumps

Double – acting axial piston pumps are used in a variety of industries, including:

  1. Construction: In construction equipment such as excavators, loaders, and bulldozers, double – acting axial piston pumps are used to power hydraulic cylinders for lifting, digging, and moving heavy loads.
  2. Aerospace: In aerospace applications, these pumps are used in hydraulic systems for aircraft control surfaces, landing gear, and other critical functions. Their high efficiency and reliability are essential for ensuring the safe operation of aircraft.
  3. Manufacturing: In manufacturing plants, double – acting axial piston pumps are used in hydraulic presses, injection molding machines, and other equipment that require high – pressure fluid power.

Maintenance and Troubleshooting

To ensure the reliable operation of double – acting axial piston pumps, regular maintenance is essential. Here are some key maintenance tips:

  1. Fluid Quality: Use high – quality hydraulic fluid and change it at regular intervals. Contaminated fluid can cause wear and damage to the pump components.
  2. Filter Replacement: Replace the hydraulic filters regularly to prevent dirt and debris from entering the pump.
  3. Inspection of Components: Periodically inspect the pump components, such as the pistons, slippers, and valve plate, for signs of wear or damage. Replace any worn or damaged parts promptly.
  4. Swash Plate Adjustment: Check the angle of the swash plate regularly and adjust it if necessary. Incorrect swash plate angle can affect the pump’s performance.

If you encounter any problems with your double – acting axial piston pump, such as low flow, high noise, or leakage, it’s important to troubleshoot the issue promptly. Common causes of problems include worn components, incorrect fluid viscosity, and air in the system.

Conclusion

In conclusion, double – acting axial piston pumps are highly efficient and versatile devices that play a crucial role in many industrial applications. Their unique design, which utilizes both strokes of the pistons, allows them to deliver high flow rates and pressures in a compact package. As a supplier of axial piston pumps, I understand the importance of these pumps in various industries and am committed to providing high – quality products and excellent customer service.

A17FO Axial Piston Fixed Pump If you’re in the market for a double – acting axial piston pump or need more information about our products, I encourage you to reach out to us. Our team of experts is ready to assist you in selecting the right pump for your specific application and to provide you with all the support you need. Whether you’re a small – scale manufacturer or a large – scale industrial operation, we have the solutions to meet your hydraulic pumping needs.

References

  • "Hydraulic Pumps: Principles, Design, and Applications" by Thomas F. Ivantysyn and Otilia Ivantysynova
  • "Fluid Power with Applications" by Anthony Esposito

Wuhan Xinlaifu Hydraulic Equipment Co., Ltd.
Wuhan Xinlaifu Hydraulic Equipment Co., Ltd. is one of the most professional axial piston pump manufacturers and suppliers in China, featured by high quality OEM&ODM products. Please feel free to buy customized axial piston pump from our factory.
Address: Liansu Industrial Park, No.1, Xincheng 11th Road, Dongxihu District, Wuhan, Hubei, China
E-mail: service@xlf-hydraulic.com
WebSite: https://www.xlf-hydraulic.com/