Hydraulic Piston Pump Parts

2 month ago

5 0 

3 year

Product details

1. Cylinder Block

• Function: Serves as the core structural component of the pump, housing multiple piston chambers internally. It facilitates the intake and discharge of hydraulic oil through the reciprocating motion of pistons.

• Role:

• Forms sealed working chambers, directly participating in hydraulic energy conversion.

• Supports critical components like pistons and valve plates. Its machining precision impacts the pump's volumetric efficiency and pressure stability.

• Typically made of high-strength cast iron or ductile iron, requiring quenching treatment to enhance wear resistance.

2. Piston

• Function: Executes reciprocating motion within the cylinder block, altering the working volume to intake and pressurize hydraulic oil.

• Role:

• Directly involved in energy conversion, with its sealing performance determining pump efficiency.

• Piston rings utilize PTFE composite materials, reducing friction coefficients below 0.05.

• Surface chromium plating (0.03-0.05mm thickness) improves corrosion and wear resistance.

3. Valve Plate (L/RH)

• Function: Controls the intake/discharge directions of hydraulic oil, with precision oil channel designs accommodating both clockwise and counterclockwise rotations.

• Role:

• Left-hand/right-hand (L/RH) versions cater to different rotational direction requirements.

• Constructed from wear-resistant alloy steel (e.g., ASTM A536 65-45-12), with surface hardness reaching HRC58-62.

• Oil channel angle errors must be within ±0.1° to ensure volumetric efficiency.

4. Retainer Plate

• Function: Maintains the positional relationship between pistons and the valve plate, preserving pump chamber sealing.

• Role:

• Prevents hydraulic oil leakage, with flatness requirements within 0.005mm.

• Often made of high-strength aluminum alloy (e.g., 7075-T6) to reduce weight while ensuring rigidity.

5. Swash Plate

• Function: Adjusts the piston stroke by varying its angle, thereby controlling pump displacement.

• Role:

• Angle adjustment range typically 0°-30°, corresponding to displacement ratios up to 1:5.

• Constructed from carburized and quenched steel (carburized layer depth 1.2-1.5mm), with surface hardness HRC58-62.

• Modern designs integrate load-sensing capabilities for ±5% automatic flow compensation.

6. Support

• Function: Supports piston motion, minimizing friction from lateral forces.

• Role:

• Employs copper-based self-lubricating bearings, achieving friction coefficients as low as 0.08.

• Surface coatings (0.01-0.02mm thickness) enhance wear resistance and anti-seizure properties.

7. Coil Spring

• Function: Provides preload to ensure tight contact between pistons and the valve plate.

• Role:

• Spring stiffness coefficients must match pump operating pressures (typically 5-15N/mm).

• Fatigue life exceeds 10⁶ cycles, utilizing chromium-silicon alloy steel (e.g., ASTM A401).

8. Spacer

• Function: Adjusts axial clearances between components, compensating for machining tolerances.

• Role:

• Thickness tolerances must be within ±0.01mm.

• Constructed from stainless steel or copper alloy to prevent high-temperature deformation.

9. Press Pin

• Function: Connects pistons to connecting rods, transmitting power.

• Role:

• Made of 20CrMnTi carburized steel, with surface hardness HRC58-63.

• Clearance fits controlled within 0.01-0.03mm to prevent fretting wear.

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

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3 year

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

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