描述

Rexroth Hydraulic Pump Axial Piston Pump A11vo A10vso A10vo100 A10vso45 140 A10vso28 A4vg A4vso

Defining the 32 Series: A Profile in Balanced Performance

The “32 series” designation classifies this model within a standardized frame size and performance family. The “45” denotes its nominal displacement of 45 cubic centimeters per revolution at maximum swashplate angle. Positioned as a versatile mid-range unit, it delivers a robust performance envelope, handling continuous operating pressures up to 280 bar and rotational speeds to 2800 rpm. This balance of power, flow, and physical size makes it a universally adaptable solution for demanding industrial applications.

Intelligent Control

The true sophistication of the A10VSO45 is realized through its selection of integrated control regulators, transforming it from a simple pump into an adaptive, system-aware component.

Pressure Compensation (DR/DRE Type)

The most widely applied version, the A10VSO 45 DR/DRE, features a built-in pressure compensator (pressure cut-off). It functions on a load-sensing principle: the pump delivers flow to maintain a set pressure differential above the load requirement. When actuator demand ceases and system pressure reaches the compensator’s preset limit, the mechanism automatically de-strokes the pump to a near-zero flow “standby” mode. This drastically reduces power consumption and heat generation at holding periods, establishing it as a cornerstone of energy-conscious hydraulic system design.

Power Limiting Regulation (LR/LRG Type)

Engineered for power-constrained applications, the constant power or “horsepower-limiter” (LR/LRG) control protects the prime mover. It continuously adjusts the pump’s displacement to maintain a constant product of pressure and flow (Power ≈ P x Q), ensuring the hydraulic power demand never exceeds the available input power from the electric motor or engine. This is critical for mobile machinery and systems with fixed or fragile power sources.

Electro-Proportional Control (DFE/DFR Type)

Representing the modern evolution of the platform, these variants integrate an electro-proportional directional valve for displacement control. Pump output is commanded via an analog current signal (e.g., 0-20 mA), enabling direct, programmable interface with PLCs and industrial controllers. This allows for sophisticated, software-defined control of flow and pressure profiles, facilitating advanced automation, motion sequences, and integration into Industry 4.0 architectures.

Real-World Deployments

Scenario 1: High-Efficiency Injection Molding

In a 500-ton plastic injection molding machine, an A10VSO 45 DRE pump is the hydraulic heart. During rapid, low-pressure phases like mold close and open, the pump operates at high displacement for maximum speed. As the cycle transitions to high-pressure clamping and injection, the pressure compensator seamlessly reduces displacement, maintaining tonnage with minimal flow. This dynamic matching of output to demand can reduce energy consumption by over 50% compared to fixed-pump systems reliant on constant relief valve dumping.

Scenario 2: Smart, Servo-Hybrid Press Brake

Within a servo-hybrid press brake, an A10VSO 45 DFE pump, governed by the machine’s CNC, works in concert with a variable-speed servo motor. The electronic control enables precise, real-time modulation of flow for the bending cylinder. This creates optimized ram velocity and force profiles, enhancing part accuracy and repeatability while achieving 40-70% energy savings through the elimination of unloaded cycling and parasitic losses.

Critical Selection and Integration Parameters

• Volumetric & Mechanical Efficiency: The pump’s high volumetric efficiency (low internal leakage) is key to its energy-saving performance. System designers must evaluate efficiency maps across the intended pressure and speed range to optimize total lifecycle cost.

• Acoustic Performance: Advanced noise-dampening features, including optimized port timing and pressure ripple suppression, result in exceptionally low operational sound levels, a vital factor for occupational health and modern machinery standards.

• Fluid Compatibility & System Cleanliness: While optimized for mineral oils, validated compatibility with HFD fire-resistant fluids and biodegradable EALs is essential for specialized applications. Adherence to the required ISO 4406 19/17/14 cleanliness level is non-negotiable for achieving the pump’s published service life and reliability.