hydraulic pump part

hydraulic pump part

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

 3 year year

Product details

I. Core Functional Components (Directly Affect Pump Performance)

1. Piston

• Function: Reciprocates in the cylinder block to achieve oil suction and discharge.

• Material: High-strength steel (e.g., 42CrMo4) or ceramic-coated (wear-resistant).

• Common Issues: Wear-induced leakage, requiring periodic replacement.

2. Cylinder Block (Barrel)

• Function: Houses pistons, forming a sealed volume.

• Key Specifications: Bore precision (H7 grade), surface roughness (Ra≤0.4μm).

• Failure Modes: Eccentric wear or corrosion; inspect coaxiality.

3. Port Plate (Valve Plate)

• Function: Controls oil flow direction for suction/discharge switching.

• Design Types: Flat port plate, spherical port plate (for high-pressure pumps).

• Maintenance: Check seal band wear; regrind if necessary.

4. Swashplate

• Function: Converts rotational motion into piston linear motion (key for variable-displacement pumps).

• Angle Range: Typically 10°–30°, affecting displacement adjustment.

• Fault Symptoms: Stiction causing unstable flow.

5. Variable Displacement Piston

• Function: Adjusts swashplate angle via hydraulic/mechanical means to vary pump displacement.

• Control Methods: Manual, hydraulic servo, or electro-hydraulic proportional control.

II. Seals & Transmission Components (Prevent Leakage & Transmit Power)

1. Seal Kit

• Composition:

• Primary seals: U-cups, V-rings (for high-pressure sealing).

• Guide rings: PTFE-based (prevent metal-to-metal contact).

• Wiper seals: Block external contaminants.

• Replacement Interval: Every 2,000 hours or as recommended by the manufacturer.

2. Bearings

• Types:

• Cylindrical roller bearings (radial load).

• Thrust bearings (axial load, e.g., from swashplate).

• Failure Causes: Insufficient lubrication or overload.

3. Drive Shaft

• Connection: Splined shaft (torque transmission).

• Inspection Items: Keyway wear, dynamic balance (≤G2.5 for high-speed pumps).

4. Ball Joint

• Function: Connects pistons to the swashplate, allowing angular deflection.

• Material: High-chromium steel (e.g., 17-4PH), surface-hardened.

III. Auxiliary Parts (Support Pump Operation & Maintenance)

1. Filters

• Types:

• Suction filters (100μm precision, protect pump from large particles).

• High-pressure filters (10μm precision, protect system components).

• Differential Pressure Alarm: Replace filter element when ΔP≥0.35MPa.

2. Mounting Flange

• Standards: SAE flanges (e.g., SAE J518C, 4-bolt/6-bolt).

• Sealing Methods: O-rings or metal-face seals (e.g., DIN 24336).

3. Port Connectors

• Thread Types: BSPP (British parallel), NPT (American tapered).

• Pressure Rating: Typically ≥35MPa (for high-pressure pump ports).

4. Pressure Sensors

• Range: 0–400bar (select based on pump rated pressure).

• Output Signals: 4-20mA or 0-10V (compatible with PLC systems).

IV. Application Scenarios

1. Construction Machinery(e.g., excavator main pumps)

• Critical Parts: Pistons, port plates, swashplates (withstand high shock loads).

• Maintenance Focus: Regularly check oil cleanliness (NAS 1638 ≤Class 7).

2. Industrial Hydraulic Systems(e.g., injection molding machines)

• Critical Parts: Variable displacement pistons, seal kits (require precise displacement control).

• Fault Diagnosis: If flow is insufficient, inspect variable mechanism for stiction.

3. Marine Steering Gear(High reliability required)

• Critical Parts: Drive shafts, bearings (require corrosion protection).

• Spare Parts Strategy: Stock swashplate assemblies (avoid offshore repair difficulties).

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

 Audited supplier

3 year

Address: Ningbo, China

Main Product: hydraulic motor, gear box , hydraulic pump, hydraulic valve , hydraulic winch, hydraulic system

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