Internal gear pump

Why Internal Gear Pumps Are Best for Hydraulic Systems

Introduction to Hydraulic Systems

Hydraulic systems are integral to various industries, powering machinery and equipment with fluid pressure. They utilise pumps to transfer hydraulic fluid, converting mechanical energy into hydraulic energy.

What Are Internal Gear Pumps?

Internal gear pumps are positive displacement pumps consisting of an outer rotor with internal teeth and an inner rotor with external teeth. As the rotors rotate, fluid is trapped between the teeth and transported from the inlet to the outlet.

How Internal Gear Pumps Work

When the rotors rotate, fluid is drawn into the pump cavity through the inlet port. As the gears mesh, the fluid is carried around the outer periphery and discharged through the outlet port. This continuous cycle results in a smooth and consistent flow of fluid.

Advantages of Internal Gear Pumps for Hydraulic Systems

Efficient Fluid Transfer

Internal gear pumps offer high volumetric efficiency, providing a consistent flow rate regardless of pressure fluctuations. This ensures optimal performance in hydraulic systems.

Compact Design

Due to their compact size and simple construction, internal gear pumps are ideal for installations where space is limited. They can be easily integrated into existing hydraulic systems without requiring extensive modifications.

Low Noise Operation

The meshing of gears in internal gear pumps produces minimal noise compared to other pump types, making them suitable for applications where noise reduction is important, such as in residential areas or noise-sensitive environments.

Versatility in Applications

Internal gear pumps are versatile and can handle a wide range of hydraulic fluids, including oils, fuels, and coolants. This versatility makes them suitable for various industries, from automotive and aerospace to manufacturing and construction.

Types of Hydraulic Systems Suitable for Internal Gear Pumps

Internal gear pumps are commonly used in both open and closed hydraulic systems. They excel in applications where precise control of fluid flow and pressure is required, such as in hydraulic power steering, lifting equipment, and machine tools.

Factors to Consider When Choosing Internal Gear Pumps

When selecting internal gear pumps for hydraulic systems, several factors should be considered:

Flow Rate and Pressure Requirements

The pump’s capacity to deliver the required flow rate and withstand operating pressures is crucial for optimal performance and system efficiency.

Material Compatibility

Selecting materials compatible with the hydraulic fluid and operating conditions is essential to prevent corrosion, wear, and contamination.

Maintenance Needs

Consideration should be given to the ease of maintenance, including access to components for inspection, repair, and replacement.

Comparison with Other Pump Types

While there are various pump types available for hydraulic systems like piston pump, servo pump, hydraulics pump, but internal gear pumps offer distinct advantages, such as higher efficiency, quieter operation, and greater versatility, making them preferred choices in many applications.

Real-World Applications of Internal Gear Pumps in Hydraulic Systems

Case Study: Automotive Industry

In the automotive industry, internal gear pumps are used in power steering systems, transmission systems, and hydraulic braking systems due to their compact size, efficiency, and reliability.

Case Study: Industrial Machinery

Internal gear pumps play a crucial role in industrial machinery, powering hydraulic presses, injection moulding machines, and metalworking equipment with precise fluid control and high reliability.

Case Study: Construction Equipment

In construction equipment, internal gear pumps are utilised in hydraulic excavators, cranes, and concrete pumps, providing the necessary power for lifting, digging, and material handling operations.

Common Misconceptions About Internal Gear Pumps

Despite their numerous benefits, internal gear pumps are sometimes misunderstood. One common misconception is that they are not suitable for high-pressure applications, which is untrue as modern internal gear pumps are capable of handling high pressures with ease.

Maintenance Tips for Internal Gear Pumps

To ensure optimal performance and longevity of internal gear pumps, regular maintenance is essential. This includes monitoring fluid levels, checking for leaks, and lubricating moving parts as per manufacturer recommendations.


In conclusion, internal gear pumps are best suited for hydraulic systems due to their efficient fluid transfer, compact design, low noise operation, and versatility in applications. By understanding their working principles and advantages, industries can leverage internal gear pumps to enhance the performance and reliability of their hydraulic systems.

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