A4VG A4VSG A4VTG Variable Displacement Piston Pump
2 month ago
Product details
A4VG / A4VSG / A4VTG Variable Displacement Axial Piston Pump
Brand: Bosch Rexroth (Germany)
Three classic Rexroth swash-plate piston pumps, differentiated by circuit type & application
1. A4VG (Closed-circuit Main Pump)
Basic Parameter
- Displacement: 28/40/56/71/90/125/180/250 cc/rev
- Rated pressure: 400 bar; Peak intermittent pressure: 450 bar
- Circuit: Closed loop hydrostatic transmission, built-in charge pump as standard
Control Options
NV(no control), DG(hyd direct), HD/HW(hyd servo), EP(electric proportional), DA(speed-related control)
Key Features
1. Stepless displacement adjustment; swash plate crosses neutral for smooth flow reversal
2. Dual built-in high-pressure relief valves for overload protection & charge replenishing
3. Integral pressure cut-off valve, compact monoblock housing
Application
Concrete mixer truck walking drive, paver, road roller, wheel loader, track-type mobile machinery closed hydraulic system
2. A4VSG (Open-circuit Main Pump)
Basic Parameter
- Displacement:40/71/125/180/250/355/500 cc/rev
- Rated:350 bar; Peak:400 bar; Open circuit design
Control Types
DR(constant pressure), LR(hyperbola constant power), FR(flow control), EO(electric proportional), MA(manual)
Key Features
Through-drive shaft for tandem composite pump assembly, superior suction performance, low noise, high power-weight ratio
Application
Excavator main pump, truck crane, concrete pump truck main hydraulic system, metallurgy & mining stationary hydraulic equipment
3. A4VTG (Special Mixer Truck Closed Pump)
Basic Parameter
- Standard size:71/90 cc/rev exclusively
- Rated:400 bar, Max speed:3050~3300rpm
Key Features
Customized version derived from A4VG, optimized for mixer drum drive, reinforced bearing & charge pump structure, anti-overload design for mixer harsh working condition
Application
Concrete transit mixer truck only, dedicated hydraulic drive for mixing drum rotation
I. A4VG Variable Displacement Piston Pump
1. Structural Features
• Swashplate-type axial piston design: Utilizes a swashplate paired with pistons for efficient hydraulic conversion.
• Closed-circuit hydrostatic transmission: Suitable for closed hydraulic systems requiring continuous pressure and flow.
• Modular design: Includes a rotating assembly (main shaft, cylinder block, pistons, port plate, etc.), swashplate section, housing, rear cover (integrated safety valve, cutoff valve, makeup relief valve, etc.), makeup pump, and control section (variable piston, control valve, etc.).
2. Functional Characteristics
• Flow and displacement: Flow is proportional to drive speed and displacement, with infinitely variable adjustment to meet diverse operating conditions.
• Flow direction: Smooth reversal of liquid flow direction is achieved by tilting the swashplate past the neutral position, enabling forward/reverse pump operation.
• Variable control: Offers multiple control methods, including manual (HW), electro-proportional (EP), hydraulic (HD), etc., for easy integration with various control and regulation systems.
• Safety protection: Safety valves are installed at both A and B high-pressure ports for system protection; these valves also integrate makeup functions to prevent system cavitation.
• Makeup and pressure cutoff: Built-in auxiliary pump serves as both makeup and control pump, with makeup pressure limited by an internal relief valve; all models feature an internal pressure cutoff valve to limit system operating pressure.
3. Applications
• Widely used in concrete pump trucks, heavy-duty hydraulic platform trucks, hydraulic power units, and other closed hydraulic system applications.
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II. A4VSG Variable Displacement Piston Pump
1. Structural Features
• Similar to A4VG: Also adopts a swashplate-type axial piston design but offers a wider range of displacement options.
• No built-in auxiliary pump: Unlike A4VG, the A4VSG pump does not include an auxiliary pump; external makeup oil and control oil supply are required.
2. Functional Characteristics
• High efficiency and energy savings: By drawing control oil from the main pump circuit, the A4VSG can theoretically achieve all variable modes of open-circuit pumps, such as constant power and constant pressure control for energy efficiency.
• Large displacement and high pressure: Provides multiple displacement options with high nominal pressure ratings to meet large-flow, high-pressure hydraulic system demands.
3. Applications
• Suitable for large-flow hydraulic systems requiring advanced variable modes and energy efficiency, such as mining roadheaders, shearers, and construction machinery.
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III. A4VTG Variable Displacement Piston Pump
1. Structural Features
• Specialized design: The A4VTG is a dedicated pump for concrete mixer trucks, with limited displacement options.
2. Functional Characteristics
• Variable modes: Primarily features mechanical and electro-proportional control methods to meet the specific requirements of concrete mixer trucks.
• Displacement options: Only available in 71 mL/r and 90 mL/r displacements, optimized for the operating conditions of concrete mixer trucks.
3. Applications
• Mainly used in concrete mixer trucks and other specialized applications.
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