CP0 CP1 CP2 Servo Hydraulic Internal Gear Pump for Injection Molding

The LIC Hydraulic CP0, CP1, and CP2 series high-pressure servo internal gear pumps (including benchmark models like CP0-16-P-10R and CP0-20-P-10R) are engineered specifically for high-frequency response and energy-saving servo-driven hydraulic systems in injection molding machines. In terms of mounting flanges, shaft extensions, port arrangements, and fluid performance, this series offers 100% drop-in interchangeability with global industry standards, such as Germany’s Eckerle EIPH/EIPC series and Japan’s Sumitomo QT series.

To withstand the aggressive dynamic cycling, instantaneous pressure buildup, and prolonged high-pressure holding typical of modern molding processes, every LIC servo gear pump undergoes 100% full-load simulated factory testing. Our pumps are proven to sustain peak volumetric efficiency and an ultra-quiet acoustic footprint even under rapid transient accelerations from 0 to 3000 rpm, delivering a highly reliable, cost-effective substitute for global B2B procurement.

Technical Specifications

Accurate engineering data for models CP0-16-P-10R, CP0-20-P-10R, and their broader families:

• Product Series: CP0 / CP1 / CP2 Series Straight-line Conjugate Internal Gear Pump

• Core Model Codes: CP0-16-P-10R / CP0-20-P-10R

• Nominal Displacement (CP0-16): 16.0 cm³/rev

• Nominal Displacement (CP0-20): 20.0 cm³/rev

• Rated Operating Pressure: 250 bar (25 MPa)

• Maximum Peak Pressure: 300 bar (30 MPa)

• Maximum Continuous Speed: 2500 – 3000 rpm (Optimized for servo-motor dynamics)

• Minimum Stable Speed: 50 rpm (Critical smooth limit under high-pressure holding phase)

• Control Type: Fixed displacement (Paired with external servo drive for closed-loop speed/torque regulation)

• Shaft Rotation: R (Right Hand / Clockwise from shaft end view)

• Recommended Fluid Medium: ISO VG32 or VG46 anti-wear hydraulic oil

• Acoustic Emission: Below 65 dB(A) (Measured at rated pressure and speed)

• Product Weight: Approx. 4.8 kg (CP0 frame) / 5.6 kg (CP1 frame)

Key Technical Advantages

• Automatic Radial and Axial Pressure Compensation: LIC integrates a floating axial compensation plate paired with a radial seal segment design. These internal micro-clearances dynamically tighten via pilot system pressure, drastically reducing internal fluid cross-port leakage. This guarantees a volumetric efficiency above 95% during high-pressure holding phases, keeping system fluid temperatures low.

• Straight-Line Conjugate Tooth Profile: The internal pinion and ring gears utilize an advanced straight-line conjugate profile that ensures seamless, rolling engagement. This eliminates the “trapped oil volume pulsation” common in traditional external gear pumps. By smoothing out fluid ripples at the source, operating noise is reduced by 4-6 dB(A) compared to alternative gear configurations.

• High-Hardness Nitrided Alloy Steel Components: Core internal gear sets are machined from premium alloy steel subjected to high-depth nitriding and ultra-precision grinding. The resulting extreme surface hardness prevents scuffing, galling, and mechanical fatigue during high-dynamic transitions where the motor accelerates from zero to full speed in milliseconds.

• Boundary-Lubrication Resilient Composite Bearings: Prolonged high-pressure holding at extremely low shaft speeds can rupture standard hydrodynamic oil films inside a pump’s bushings. LIC resolves this by deploying heavy-duty composite bushings infused with self-lubricating PTFE layers, ensuring an exceptionally low friction coefficient and preventing metal-to-metal boundary contact.

Application Areas

The CP0 / CP1 / CP2 internal gear pump series excels in high-efficiency, closed-loop servo hydraulic circuits including:

• Servo-Driven Injection Molding Machines: Serving as the precision hydraulic power core for mid-to-small tonnage servo molding systems (e.g., Haitian, Yizumi, Chen Hsong).

• Rubber Vulcanizing & Compression Presses: Meeting the stringent performance requirements for sustained pressure holding combined with low electrical consumption.

• Footwear & Leather Processing Machinery: Integrated into single or multi-pump servo configurations for rapid velocity-pressure profiling.

• Precision Hydraulic Punching & Stamping Presses: Deployed in automated processing gear subjected to severe high-frequency directional flow shocks.

Expert Maintenance Tips

• Mitigate Overheating at Ultra-Low Speeds: During long-cycle pressure holding, if the servo drive runs the pump below 50 rpm under pressures exceeding 200 bar, the hydrodynamic film thins and localized heat accumulates. Optimize drive configurations to maintain a safe minimal RPM or integrate a small bleed-off flush line to refresh the oil inside the housing.

• Strict Cavitation Prevention: Servo motors ramp up speed incredibly fast (0 to thousands of RPM within tens of milliseconds), creating an intense instantaneous vacuum at the pump inlet. Ensure the suction pipe is perfectly sealed, short, and free from restrictive bends. Suction strainers must be cleaned routinely to eliminate the risk of cavitation pits on internal gear stators.

• Maintain Premium Fluid Filtration: The pressure compensation clearances inside conjugate internal gear pumps are tight and vulnerable to abrasive wear. Keep system fluid cleanliness strictly calibrated to ISO 4406 19/16/13 (NAS Class 8) or cleaner, utilizing high-efficiency 10-micron absolute return line filters.