A4VG175 hydraulic Charge pump
5 month ago
Product details
I. Product Overview
The A4VG175 is a swashplate-type axial piston variable displacement pump manufactured by Rexroth, designed forclosed-loop hydrostatic transmission systems. It is widely used in construction machinery, concrete pump trucks, heavy-duty hydraulic platform vehicles, and other mobile equipment. In addition to functioning as a main pump, it integrates acharge pumpto replenish hydraulic fluid in the closed loop, maintaining stable system pressure and preventing cavitation and air ingestion.
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II. Functions of the Charge Pump
1. Hydraulic Fluid Replenishment
In closed-loop systems, hydraulic fluid is continuously circulated, leading to losses due to leakage or high-temperature evaporation. The charge pump draws in low-pressure fluid, pressurizes it, and injects it back into the system to ensure the loop remains fully filled.
2. System Pressure Maintenance
The charge pump provides a steady replenishment pressure, preventing system pressure from dropping too low, which could cause sluggish actuator performance or failure.
3. Cooling and Filtration
The fluid drawn by the charge pump typically passes through a filter, removing contaminants and impurities. Additionally, fluid circulation helps dissipate heat, reducing system temperature.
4. Prevention of Air Ingestion and Cavitation
During high-speed or heavy-load operations, the main pump’s suction port may experience fluid shortage, leading to air ingestion and cavitation. The charge pump ensures continuous fluid supply, mitigating these issues.
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III. Technical Features of the A4VG175 Charge Pump
1. Built-in Design
The charge pump is typically integrated within the main pump housing, offering a compact structure that reduces installation space and minimizes piping connections, enhancing system reliability.
2. Variable Displacement Control
The charge pump’s output can be adjusted to meet varying replenishment demands under different operating conditions.
3. High-Pressure Relief Protection
A high-pressure relief valve is installed at the charge pump outlet. When system pressure exceeds the set limit, the valve opens to prevent damage to the pump and system components due to overpressure.
4. High Charge Pressure
The charge pump provides elevated replenishment pressure to ensure effective fluid supply under heavy-load or high-speed conditions. Meanwhile, the built-in relief valve limits the maximum charge pressure to prevent system overpressure.
5. Corrosion and Wear Resistance
Critical components such as pistons and cylinders are made from high-strength, corrosion-resistant materials, ensuring long-term reliable operation in harsh environments.
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IV. Applications
The A4VG175 hydraulic charge pump is widely used in the following fields:
1. Construction Machinery
• Excavators, loaders, and road rollers for driving swing mechanisms and travel devices.
2. Concrete Pump Trucks
• Serves as the main pump for concrete delivery while the charge pump ensures stable system pressure.
3. Heavy-Duty Hydraulic Platform Vehicles
• Powers vehicle travel and steering systems, with the charge pump guaranteeing reliable closed-loop operation.
4. Other Mobile Equipment
• Agricultural machinery, mining equipment, and other applications requiring closed-loop hydrostatic transmission.
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