A11VO hydraulic pump

The A11VO hydraulic pump is a swashplate-type axial piston variable displacement pump manufactured by Bosch Rexroth (Germany). Designed specifically for open-loop systems in mobile machinery, it features high pressure, high flow, multiple control options, and a through-shaft drive. It is widely used in heavy-duty equipment such as construction machinery and mining machinery.

First, Core Positioning and Model

1. Brand: Bosch Rexroth (Germany)

2. Type: Open-loop, swashplate-type, variable-displacement axial piston pump

3. Model Series:

A11VO: Base model, supports self-priming or tank pressurization.

A11VLO: Enhanced model, features a built-in makeup pump to improve suction performance at high speeds and high displacement, offering stronger resistance to cavitation.

4. Displacement Specifications (cm³/rev): 40, 60, 75, 95, 130, 145, 190, 260.

Second, Key Technical Parameters

1. Rated Pressure: 350 bar (35 MPa)

2. Peak Pressure: 400 bar (40 MPa)

3. Maximum Speed (rpm):

4. Small displacement (40–145): 2500

5. Large displacement (190–260): 2300

6. Flow rate: Proportional to speed and displacement; infinitely adjustable from 0 to maximum flow.

7. Drive method: 100% through-shaft drive; can be connected in series with gear pumps or piston pumps of the same specification.

Third, Structure and Working Principle

Core Structure: Consists of a main shaft, cylinder block, pistons, slippers, swash plate, distribution plate, and variable mechanism.

Working Principle:

1. The main shaft drives the cylinder block to rotate, causing the pistons to revolve with the cylinder block while performing reciprocating motion.

2. The swash plate angle determines the piston stroke: the larger the angle, the greater the displacement; when the angle is 0, the displacement is 0.

3. The swashplate angle is continuously adjusted via the variable mechanism to achieve continuous, controllable flow.

4. The distribution plate manages the distribution of suction and discharge oil, providing high-pressure output.

Fourth, Main Control Modes

1. LR Constant Power Control: P × Q = constant, prevents engine overload, standard for mobile machinery.

2. DR Constant Pressure Control: Maintains constant system pressure, suitable for pressure-holding and clamping applications.

3. HD Hydraulic Pilot Control: Displacement is adjusted via remote hydraulic signals, suitable for complex operations.

4. EP Electro-Proportional Control: Stepless adjustment via 24V electro-proportional signals, suitable for electronic control/intelligent systems.

5. LRDS Load Sensing + Pressure Shut-off: On-demand oil supply, saving approximately 30% energy, with high-pressure protection.

Fifth, Key Features

1. High Pressure and High Efficiency: 350 bar rated pressure, high volumetric efficiency, and low internal leakage.

2. Flexible Displacement: 0–100% stepless flow adjustment, fast response, and high precision.

3. Multi-Control Compatibility: Optional hydraulic or electrical control, covering constant power, constant pressure, load-sensing, and other operating conditions.

4. Common-Shaft Drive: Multiple pumps can be connected in series, saving installation space and reducing costs.

5. High Reliability: High-precision fit of the three major friction pairs (piston-cylinder, slipper-swashplate, and distribution plate) combined with special surface treatment ensures long service life.

6. Strong Self-Priming Capability: The A11VLO features a makeup pump, providing cavitation resistance and stable operation at high speeds.

Does A11VO need a charge pump

What is the power setting of the A11VO