A4VG175 Hydraulic Piston Pump Parts
3 month ago
Product details
I. Overview of A11VLO190 Hydraulic Piston Pump
TheA11VLO190is anaxial piston variable-displacement pumpmanufactured byRexroth, designed for closed-loop hydraulic systems (e.g., construction machinery, industrial vehicles, marine propulsion). Key features include:
• Displacement range: 190 cm³/rev (variable via proportional solenoid or manual control).
• Rated pressure: 350 bar (peak pressure up to 420 bar).
• Control modes:
• LR: Hydraulic remote control.
• DR: Pressure-compensated control.
• EP: Electric proportional control.
• Structural advantages: High power density, low noise, and long service life under high-pressure, high-frequency conditions.
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II. Core Components and Functions
1. Drive and Structural Parts
• Cylinder Block
• Material: High-strength alloy steel (e.g., 17CrNiMo6).
• Function: Supports piston movement and forms sealed oil chambers with the port plate.
• Key parameters:
• Surface hardness: HRC 58-62.
• Flatness tolerance: ≤0.005 mm.
• Common failures: Wear-induced leakage (inspect piston bore diameter; replace if out of tolerance).
• Port Plate
• Material: Copper-based alloy (e.g., ZQSn10-2) or composite.
• Function: Distributes high-pressure and return oil, isolating suction/pressure zones.
• Key parameters:
• Kidney slot angle: 12°-15°.
• Surface roughness: Ra ≤ 0.2 μm.
• Maintenance: Regularly inspect contact surface with the cylinder block; lapping repair if needed.
• Swash Plate
• Material: Ductile iron (QT600-3) or forged steel.
• Function: Converts rotational motion into piston reciprocation via angular adjustment for displacement control.
• Key parameters:
• Maximum tilt angle: 25°.
• Surface hardness: HRC 45-50.
• Failure modes: Wear-induced displacement instability (inspect surface roughness and coating thickness).
2. Piston and Slipper Assembly
• Piston & Slipper Assembly
• Piston material: Carburized steel (e.g., 20CrMnTi).
• Slipper material: Copper-based alloy (coating thickness: 0.03-0.05 mm).
• Function: Transmits motion between pistons and swash plate; slipper reduces friction and prevents metal-to-metal contact.
• Key parameters:
• Piston diameter: 28 mm (tolerance ±0.01 mm).
• Slipper ball radius: R12 mm.
• Common issues: Slipper burnout or piston scratches (replace entire assembly).
• Retainer Plate
• Material: Spring steel (e.g., 65Mn).
• Function: Maintains piston group alignment in the cylinder block to prevent detachment.
• Inspection: Elastic deformation (≤0.5 mm), no cracks.
3. Control and Regulation Components
• Proportional Solenoid
• Function: Adjusts swash plate angle via current signals for stepless displacement control.
• Key parameters:
• Rated current: 0.8 A (corresponds to maximum displacement).
• Response time: ≤50 ms.
• Failures: Solenoid jamming or coil burnout (inspect resistance: standard 10-15 Ω).
• Pressure Compensator
• Function: Maintains stable system pressure to prevent overload.
• Setting pressure: 320 bar (adjustable range: 280-360 bar).
• Maintenance: Regularly clean valve spool and check spring preload.
4. Bearing and Sealing Systems
• Main Bearing
• Type: Double-row tapered roller bearing (e.g., 32022).
• Life requirement: L10 life ≥ 15,000 hours (rated conditions).
• Inspection: Axial clearance (≤0.1 mm), radial clearance (≤0.05 mm).
• Shaft Seal
• Type: Double-lip rubber seal (material: FKM).
• Function: Prevents hydraulic oil leakage and external contamination.
• Key parameters:
• Compression rate: 20%-25%.
• Temperature range: -40°C to +120°C.
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