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REXROTH variable piston pump
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Description
REXROTH Variable Displacement Piston Pump Specifications & Model Explanation
1. Overview
REXROTH variable displacement piston pumps are high-performance hydraulic components designed for high-pressure, high-efficiency industrial and mobile applications. With adjustable displacement, these pumps can flexibly adapt to varying flow and pressure requirements of hydraulic systems, reducing energy consumption while ensuring stable operation. The mainstream series include A4VSO, A10VSO, and A2FO, covering open-circuit and closed-circuit systems, and are widely used in engineering machinery, machine tools, metallurgy, and other fields.
2. Core Technical Data (Main Series)
|
Parameter
|
A4VSO Series (Open-Circuit)
|
A10VSO Series (Open-Circuit)
|
A2FO Series (Closed-Circuit)
|
|---|---|---|---|
|
Geometric Displacement (Vg)
|
25 – 1000 cm³/rev (sizes: 25, 40, 50, 63, 80, 100, 125, 160, 200, 250, 355, 500, 710, 1000)
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18 – 140 cm³/rev (sizes: 18, 28, 45, 63, 71, 100, 140)
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10 – 160 cm³/rev (sizes: 10, 16, 23, 32, 45, 56, 80, 107, 160)
|
|
Speed Range
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Min: 600 min⁻¹; Max: 2800 min⁻¹ (varies by size)
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Min: 600 min⁻¹; Max: 3000 min⁻¹ (varies by size)
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Min: 1000 min⁻¹; Max: 3000 min⁻¹ (varies by size)
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|
Continuous Operating Pressure (pN)
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350 bar (up to 420 bar for large sizes)
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280 bar (315 bar for size 140)
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400 bar (intermittent: 450 bar)
|
|
Intermittent Operating Pressure (pmax)
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420 bar (10% duty cycle, 10s)
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350 bar (10% duty cycle, 10s)
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450 bar (10% duty cycle, 10s)
|
|
Flow Rate (1500 min⁻¹, 10 bar)
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37.5 – 1500 l/min
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27 – 210 l/min
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15 – 240 l/min
|
|
Minimum Drive Power (≈1 bar)
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2.5 – 80 kW (varies by size)
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1.8 – 17.5 kW (varies by size)
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1.0 – 16 kW (varies by size)
|
|
Weight
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25 – 380 kg (varies by size)
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12 – 55 kg (varies by size)
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8 – 48 kg (varies by size)
|
|
Inlet Pressure
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0.8 – 2.5 bar
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0.8 – 2.5 bar
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1.5 – 3.0 bar (closed-circuit requirement)
|
3. Key Features
-
Adjustable Displacement: Stepless displacement adjustment (0 – 100%) via various control modes, adapting to dynamic system requirements and saving energy.
-
High Pressure & Efficiency: Advanced axial piston structure with precision machining, ensuring high volumetric efficiency (≥95%) and mechanical efficiency (≥90%) even at high pressure.
-
Multiple Control Modes: Support pressure control (DR), flow control (HD), load-sensitive control (LR), electro-hydraulic proportional control (EP), and manual control (M), meeting diverse application needs.
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Long Service Life: Wear-resistant piston and cylinder block, steel-backed bearing bushes, and optimized oil distribution structure, supporting up to 2×10⁶ load cycles at maximum pressure.
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Wide Compatibility: Suitable for open-circuit and closed-circuit hydraulic systems, compatible with REXROTH valves, motors, and other components for integrated system configuration.
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Low Noise: Optimized flow distribution and damping design, reducing operating noise to 65 – 85 dB(A) (varies by size and speed).
4. Hydraulic Fluid & Environmental Requirements
|
Parameter
|
Specification
|
|---|---|
|
Permissible Fluids
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HL/HLP mineral oil (DIN 51524); HEES/HEPR synthetic hydraulic fluids (DIN ISO 15380); HETG fire-resistant hydraulic fluids (DIN 51522)
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|
Operating Temperature
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-20 °C to +90 °C (short-term up to +110 °C)
|
|
Ambient Temperature
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-20 °C to +70 °C
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|
Viscosity Range
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10 – 400 mm²/s; Maximum starting viscosity: 2000 mm²/s
|
|
Fluid Cleanliness
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ISO 4406 (c) 18/16/13 (recommended); Minimum ISO 4406 (c) 20/18/15
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5. Model Code Structure (Main Series)
5.1 A4VSO Series (Open-Circuit)
Standard Ordering Code: A4VSO [Size]-[Control Mode]/[Mounting Type]-[Shaft Type][Seal Type][Optional]
|
Segment
|
Code
|
Meaning
|
|---|---|---|
|
Series
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A4VSO
|
Axial piston pump, variable displacement, open-circuit, swashplate design
|
|
Size
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25, 40, 50, …, 1000
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Geometric displacement (cm³/rev), e.g., 125 = 125 cm³/rev
|
|
Control Mode
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DR/HD/LR/EP/M
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DR: Pressure control; HD: Flow control; LR: Load-sensitive control; EP: Electro-hydraulic proportional control; M: Manual control
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Mounting Type
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30R/31R/32L
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30R: Flange mounting (ISO 3019-2); 31R: Foot mounting; 32L: Special flange mounting
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|
Shaft Type
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PPB/PPA
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PPB: Parallel keyed shaft (ISO 3019-2); PPA: Splined shaft (SAE J744)
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|
Seal Type
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N00/V
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N00: Nitrile rubber (NBR) seal; V: Fluorocarbon rubber (FKM) seal
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Optional
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S/DF
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S: With pressure relief valve; DF: Double flow design
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Example: A4VSO125DR/30R-PPB13N00 (Material No.: R902445154) – A4VSO series, 125 cm³/rev, pressure control, flange mounting, parallel keyed shaft, NBR seal, standard configuration.
5.2 A10VSO Series (Open-Circuit)
Standard Ordering Code: A10VSO [Size]-[Control Mode]/[Mounting Type]-[Shaft Type][Seal Type][Optional]
|
Segment
|
Code
|
Meaning
|
|---|---|---|
|
Series
|
A10VSO
|
Axial piston pump, variable displacement, open-circuit, compact swashplate design
|
|
Size
|
18, 28, …, 140
|
Geometric displacement (cm³/rev), e.g., 71 = 71 cm³/rev
|
|
Control Mode
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DR/HD/LR/EP/M
|
Same as A4VSO series
|
|
Mounting Type
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31R/32L/35V
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31R: Foot mounting; 32L: Flange mounting; 35V: Vertical mounting
|
|
Shaft Type
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PPB/PPA
|
Same as A4VSO series
|
|
Seal Type
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N00/V
|
Same as A4VSO series
|
Example: A10VSO71DR/31R-PPB12N00 (Material No.: R902445160) – A10VSO series, 71 cm³/rev, pressure control, foot mounting, parallel keyed shaft, NBR seal.
5.3 A2FO Series (Closed-Circuit)
Standard Ordering Code: A2FO [Size]-[Control Mode]/[Mounting Type]-[Shaft Type][Seal Type]
|
Segment
|
Code
|
Meaning
|
|---|---|---|
|
Series
|
A2FO
|
Axial piston pump, variable displacement, closed-circuit, swashplate design (for hydrostatic transmission)
|
|
Size
|
10, 16, …, 160
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Geometric displacement (cm³/rev), e.g., 56 = 56 cm³/rev
|
|
Control Mode
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63/64/65
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63: Manual control; 64: Hydraulic control; 65: Electro-hydraulic proportional control
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|
Mounting Type
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32/34
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32: Flange mounting; 34: Foot mounting
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|
Shaft Type
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F/FA
|
F: Parallel keyed shaft; FA: Splined shaft
|
|
Seal Type
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V
|
FKM (fluorocarbon) seal (standard for closed-circuit)
|
Example: A2FO56/63R-VAB010 (Material No.: R902445172) – A2FO series, 56 cm³/rev, manual control, flange mounting, parallel keyed shaft, FKM seal.
6. Key Dimensions (Unit: mm, Typical Models)
6.1 A4VSO 125
|
Dimension
|
Value (±0.5)
|
Description
|
|---|---|---|
|
a
|
280
|
Overall length (flange to shaft end)
|
|
b
|
180
|
Flange width
|
|
d
|
45
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Shaft diameter (PPB type)
|
|
M
|
M16×1.5
|
Mounting thread
|
6.2 A10VSO 71
|
Dimension
|
Value (±0.5)
|
Description
|
|---|---|---|
|
a
|
210
|
Overall length (flange to shaft end)
|
|
b
|
140
|
Flange width
|
|
d
|
35
|
Shaft diameter (PPB type)
|
|
M
|
M12×1.25
|
Mounting thread
|
7. Material Specifications
|
Component
|
Material
|
|---|---|
|
Housing & Flange
|
High-strength cast iron (GG25) or aluminum alloy (for small sizes)
|
|
Cylinder Block & Piston
|
High-strength alloy steel (heat-treated)
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|
Swashplate & Valve Plate
|
Wear-resistant alloy steel with hard chrome plating
|
|
Shaft
|
Nickel-chromium alloy steel (quenched and tempered)
|
|
Bearings
|
Steel-backed copper-tin alloy or roller bearings
|
|
Seals
|
NBR/FKM rubber (depending on seal type)
|
8. Applications
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Industrial Applications: Machine tools, plastic injection molding machines, metallurgical equipment, hydraulic presses, power units, and open/closed-circuit hydraulic systems requiring variable flow and high pressure.
-
Mobile Applications: Construction machinery (excavators, loaders), agricultural machinery, mining equipment, and mobile hydraulic systems with energy-saving requirements.
9. Important Notes
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Displacement adjustment must be performed under rated pressure to avoid mechanical damage; over-adjustment is strictly prohibited.
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The drive shaft must be precisely aligned with the motor shaft (coaxiality ≤0.1 mm) to prevent radial/axial forces on the pump shaft.
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System-side pressure relief valves and filters must be installed to ensure fluid cleanliness and protect the pump from overpressure.
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Regular maintenance (oil change, filter replacement) is required; hydraulic oil should be replaced every 2000 operating hours.
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Avoid operating the pump at low speed and high pressure for a long time, as this may reduce service life and increase noise.
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Seals should be inspected and replaced every 3 – 5 years, or earlier if leakage is detected.
Source: Bosch Rexroth RE 10232 (09.2015) & Official Product Specifications.
Hydraulic pump manufacturer
Additional information
| Color |
Beige ,Black |
|---|---|
| Thickness |
0.39" |
| Diameter |
1.58" |
| Strap size |
Unisex |
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