Danfoss Tandem Gear Pump for Side Thrust Device

1. Product Overview

The Danfoss Tandem Gear Pump specifically designed for side thrust devices is a high-performance hydraulic component integrating two gear pump sections into a single robust housing. This integrated design enables the pump to provide two independent hydraulic circuits with a single drive source, making it an ideal core power unit for marine and industrial side thrust systems that require precise and reliable power output. Leveraging Danfoss’ over 100 years of expertise in hydraulic technology, this tandem gear pump delivers exceptional performance even under extreme operating conditions such as high pressure, high vibration, and harsh environmental exposures.

The pump is engineered to perfectly match the operational demands of side thrust devices, ensuring smooth and responsive thrust adjustment. Its compact structure optimizes installation space, while high-quality materials and precision manufacturing guarantee long-term operational stability and minimal maintenance requirements.

2. Working Principle

As a positive-displacement hydraulic pump, the Danfoss Tandem Gear Pump operates based on the meshing rotation of gears. The two gear pump modules share a common drive shaft, which is driven by the prime mover to rotate both sets of gears simultaneously. On the suction side of each pump section, the meshing gears separate to create a vacuum, drawing hydraulic fluid into the pump cavity through the inlet port. The fluid is then trapped in the gaps between the gear teeth and the pump housing, and is conveyed from the suction side to the discharge side as the gears rotate.

On the discharge side, the gears re-mesh, squeezing the trapped fluid and forcing it out through the respective outlet ports of the two pump sections. Each pump section can independently supply hydraulic fluid to different components of the side thrust device, enabling coordinated control of the thrust mechanism. The precise gear clearances and advanced sealing technology ensure minimal internal leakage, maintaining high volumetric efficiency and stable flow output.

3. Core Features

• Integrated Tandem Design: Two pump sections are integrated into one housing, sharing a common drive shaft. This design reduces the number of components, saves installation space, and simplifies the overall hydraulic system layout of the side thrust device compared to using two independent single gear pumps.
• High Reliability & Durability: Constructed with high-grade cast iron housing and precision-engineered gear components, the pump exhibits excellent resistance to wear, corrosion, and high pressure. The adoption of self-lubricating bearings and high-performance Viton oil seals enhances its service life and reliability under harsh operating conditions.
• Efficient Performance: The pump achieves high volumetric efficiency (typically 90-95%) through precise gear machining and advanced axial clearance compensation technology. This ensures efficient fluid transfer, reduces energy consumption, and optimizes the operating cost of the side thrust system.
• Independent Dual Circuits: Each pump section features independent outlet ports (and optional independent inlet ports), allowing for independent control of two hydraulic circuits. This enables flexible matching of flow and pressure requirements for different functional components of the side thrust device, improving system operational flexibility.
• Low Noise Operation: The optimized gear profile design and precision assembly minimize gear meshing noise during operation. This reduces the overall noise level of the side thrust system, enhancing workplace comfort and meeting strict noise emission standards.

4. Technical Specifications

5. Application Fields

This tandem gear pump is specifically tailored for side thrust devices in the following applications:

• Marine vessels: Provides power for ship side thrust systems, enabling precise maneuvering and position control during berthing and low-speed navigation.
• Port machinery: Applied in side thrust devices of port cranes, container handlers, and other equipment to enhance operational stability and positioning accuracy.
• Offshore engineering: Suitable for side thrust systems of offshore platforms, drilling rigs, and other marine engineering equipment, adapting to harsh marine environments.
• Industrial heavy machinery: Used in side thrust devices of large-scale excavators, bulldozers, and other construction machinery to improve operational flexibility and stability.

6. Installation & Maintenance Notes

6.1 Installation Precautions

• Ensure the pump mounting flange and drive shaft are correctly aligned with the prime mover; the coaxiality error should not exceed 0.1 mm to avoid additional axial and radial forces on the pump shaft.
• Verify that the rotation direction of the pump matches the direction indicated on the nameplate; reverse rotation is strictly prohibited as it will cause damage to the pump and system malfunction.
• The suction pipe diameter should be sufficient to ensure the oil flow rate is less than 1.5 m/s, and the suction height should not exceed 0.5 m to prevent cavitation.
• Ensure tight sealing of all pipe connections to avoid air leakage, which can cause noise, vibration, and reduced pump performance.

6.2 Maintenance Requirements

• Maintain the cleanliness of the hydraulic system; the filter accuracy of the return line should not be less than 25 μm to prevent contaminant particles from entering the pump and causing wear.
• Regularly check the oil level, oil quality, and oil temperature of the hydraulic system. Replace the hydraulic oil and filter elements according to the recommended maintenance cycle.
• Periodically inspect the pump for oil leakage, abnormal noise, and vibration. If any abnormalities are detected, stop the operation immediately and perform troubleshooting.
• Avoid overloading the pump beyond the rated pressure and speed limits to prevent premature wear and failure.