A11V axial piston pump in tandem with a gear pump

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A11V/A10V/A4VG Axial Piston Pump Overview 1. Product Types and Positioning TheA11V, A10V, and A4VGare allswashplate-type axial piston variable displacement pumpsdeveloped by Bosch Rexroth (Germany). They are widely used in hydraulic systems for construction machinery, marine applications, metallurgy, mining, and other high-pressure, high-flow scenarios. While sharing similar design principles, they differ instructural characteristics, performance parameters, andfunctional configurationsto suit specific applications. Below is a detailed comparison covering technical specifications, structural features, applications, and strengths/weaknesses. ------ 2. Key Parameter Comparison 【表格】 Parameter A11V Series A10V Series A4VG Series Pressure Rating 350–450 bar (ultra-high pressure) 280–350 bar (high pressure) 450–500 bar (ultra-high pressure, heavy-duty) Displacement Range 28–260 cm³/rev 18–140 cm³/rev 56–280 cm³/rev Speed Range 600–3000 rpm 600–3000 rpm 600–2500 rpm (optimized for heavy-duty) Variable Control Methods Electro-hydraulic proportional/servo/constant pressure/constant power Electro-hydraulic proportional/constant pressure/load sensing Electro-hydraulic proportional/servo/constant power/remote control Typical Applications Large excavators, rotary drilling rigs Medium-sized cranes, concrete pump trucks Mining dump trucks, shield tunneling machines, large presses Parameter Analysis: • A11V: Designed for ultra-high pressure and large displacement, suitable forhigh-burst, heavy-load conditions(e.g., excavator boom swing, hammer operation). • A10V: Balanceshigh pressure and lightweight design, offering a cost-effective solution formedium-to-large mobile equipment. • A4VG: Heavy-duty reinforced type, optimized forlow-speed, high-torque applications(e.g., mining truck lifting, shield tunneling machine propulsion). ------ 3. Structural Features and Technological Innovations (1) A11V Series • Piston and Cylinder Block: Made ofhigh-strength alloy steel with nitriding treatment, with a piston diameter up to 38mm and cylinder bore of 50mm, ensuring fatigue resistance under ultra-high pressure. • Swashplate Variable Mechanism: Equipped with adual-spring return system, achieving a response time of ≤30ms to meet the rapid start-stop requirements of excavator boom cylinders. • Typical Case: The SANY SY650H excavator (A11VLO260 pump) delivers 260L/min at 450bar, enabling a boom cylinder cycle time of 12 seconds. (2) A10V Series • Lightweight Design: Adopts analuminum alloy housing with integrated control valve block, reducing weight by 15%-20% compared to the A11V, suitable for space-constrained vehicle installations. • Load-Sensing Control: Integrates apressure-flow composite control valveto dynamically adjust displacement based on load demand, reducing system energy consumption by 10%-18%. • Typical Case: The Zoomlion ZTC800V653 crane (A10VSO140 pump) achieves flow distribution on demand during boom extension, avoiding overflow losses through load-sensing control. (3) A4VG Series • Heavy-Duty Reinforced Structure: Features abi-metal cylinder block with floating port plate, with a hard chrome-plated and laser-honed port plate surface, tripling the service life (MTBF ≥10,000h) compared to standard pumps. • Servo Variable System: SupportsCAN bus communicationfor remote parameter adjustment in conjunction with PLC, suitable for automated production lines (e.g., press pressure closed-loop control). • Typical Case: The Northern Heavy Industries Φ12m shield tunneling machine (A4VG280 pump) drives propulsion cylinders at 500bar, achieving 0.1mm-level tunneling precision. ------ 4. Application Scenarios and Selection Recommendations (1) A11V Suitable Scenarios • Heavy-load transient conditions: Such as excavator boom digging, hammer impact. • High dynamic response requirements: Such as rotary drilling rig powerhead start-stop, crane luffing motions. • Selection Key: Prioritize matching withhigh-power-density motors(e.g., IPM permanent magnet synchronous motors) to avoid motor overload. (2) A10V Suitable Scenarios • Medium-to-high pressure continuous conditions: Such as concrete pump truck boom extension, paver travel drive. • Energy-saving sensitive scenarios: Such as sanitation vehicle hydraulic lifting systems, port AGV handling vehicles. • Selection Key: Recommend pairing withload-sensing multi-way valvesto maximize the advantage of on-demand flow distribution. (3) A4VG Suitable Scenarios • Ultra-high pressure, heavy-load conditions: Such as mining truck lifting, shield tunneling machine propulsion, rolling mill press-down. • Automation control requirements: Such as press pressure closed-loop control, injection molding machine holding pressure control. • Selection Key: Requires matching withhigh-torque, low-speed motors(e.g., asynchronous variable frequency motors) and verifying axial load capacity. ------ 5. Performance Strengths and Weaknesses Comparison 【表格】 Indicator A11V Strengths A10V Strengths A4VG Strengths Pressure Capacity Ultra-high pressure (450bar+) High pressure (350bar) Heavy-duty ultra-high pressure (500bar) Response Speed Extremely fast (≤30ms) Fast (≤50ms) Fast (≤40ms) Energy Efficiency Moderate (88%-91% efficiency) High (90%-93% efficiency) High (90%-92% efficiency) Reliability High (MTBF ≥8000h) Relatively high (MTBF ≥7000h) Extremely high (MTBF ≥10,000h) Cost High (15%-20% premium) Moderate Very high (30%-40% premium) Decision Logic: • Cost-sensitive: Prioritize A10V (e.g., medium-sized cranes). • Heavy-load, burst-demand: Prioritize A11V (e.g., mining crushing equipment). • Long-life, heavy-load: Prioritize A4VG (e.g., shield tunneling machines, mining trucks). ------ 6. Analysis of Typical Application Cases (1) SANY SY650H Excavator (A11VLO260 Pump) • Operational Challenge: The boom cylinder needs to build 450bar pressure within 2 seconds, with flow demand surging from 0 to 260L/min. • Solution: The A11VLO260 pump achieves a 30ms response via itsdual-spring variable mechanism, coupled withsecondary pressure compensationin the main valve to ensure shock-free startup of the boom cylinder. • Energy-Saving Effect: Reduces system energy consumption by 22% during idle swing by reducing displacement to 60% viaconstant power control. (2) Zoomlion ZTC800V653 Crane (A10VSO140 Pump) • Operational Challenge: The boom extension must maintain ±0.5° positioning accuracy under 8-level wind conditions, with flow fluctuations ≤3%. • Solution: