Eckerle Shimadzu HGP Series Gear Pump HGP-1A HGP-4A

The industrial and mobile-grade HGP Series High-Pressure External Hydraulic Gear Pumps (focusing heavily on premium global B2B high-frequency configurations including HGP-1A-F1R, HGP-1A-F2R, HGP-1A-F3R, HGP-1A-F4R, HGP-1A-F5R, HGP-1A-F6R, HGP-1A-F8R, and the large-capacity HGP-4A-F50R), engineered by Chengyuan Hydraulic, are high-efficiency, low-noise power components. Tailored for machine tool hydraulic units, injection molding auxiliary clamping circuits, materials handling lifts, and customized hydraulic power packs (HPUs), these pumps leverage a classic three-piece high-strength aluminum/cast-iron architecture to deliver reliable fluid power delivery up to $25\text{ MPa}$.

Complying rigidly with international SAE and standard industrial mounting matrices, Chengyuan’s HGP gear pumps provide 100% direct drop-in interchangeability with global market standards (such as Shimadzu HGP design metrics). From the rhombic two-bolt mounting flanges, specialized drive shafts (Straight Keyed, Splined, or Tang Drive) to standard pipe thread or flange connection configurations, these units install flawlessly into existing layouts. Machine OEM integration engineers and global distributors can execute fluid power maintenance updates without structural modification or line reconfiguration, ensuring reduced total life-cycle costs.

As the core driving pump in miniature to mid-sized hydraulic systems, external gear pumps are continually exposed to high continuous pressures, rapid cycle operations, and thermal degradation of the oil medium. Any degradation of the axial sealing clearance or齿顶 tooth edge micro-scoring will lead to a collapse in volumetric efficiency, causing system pressure drop and halting operations. To prevent failures in the field, 100% of Chengyuan’s HGP-1A and HGP-4A pumps undergo 100% strict dynamic test bench evaluation under full working pressure. Each unit is qualified at pressures up to $21-25\text{ MPa}$ to ensure high volumetric conversion, low internal case bypass, and reliable acoustic control boundaries.

Technical Specifications

• Product Classification: External Hydraulic Gear Pump

• Frame Sizing Designation: HGP Series (Frame sizes 1A and 4A available)

• Geometric Displacement Profiles (ml/rev):

  • HGP-1A-F1R: $1.1\text{ ml/rev}$

  • HGP-1A-F2R: $2.1\text{ ml/rev}$

  • HGP-1A-F3R: $3.3\text{ ml/rev}$

  • HGP-1A-F4R: $4.1\text{ ml/rev}$

  • HGP-1A-F5R: $5.1\text{ ml/rev}$

  • HGP-1A-F6R: $6.1\text{ ml/rev}$

  • HGP-1A-F8R: $7.8\text{ ml/rev}$

  • HGP-4A-F50R: $50.3\text{ ml/rev}$

• System Pressure Operational Limits:

  • HGP-1A Frame Range: Nominal Continuous Pressure of $21.0\text{ MPa}$ (210 bar); Peak Transient Pressure up to $25.0\text{ MPa}$ (250 bar).

  • HGP-4A Frame Range: Nominal Continuous Pressure of $17.5\text{ MPa}$ (175 bar); Peak Transient Pressure up to $21.0\text{ MPa}$ (210 bar).

• Permissible Rotational Boundaries (rpm):

  • HGP-1A Series Range: Minimum speed $600\text{ rpm}$; Maximum speed up to $3500\text{ rpm}$.

  • HGP-4A Series Range: Minimum speed $500\text{ rpm}$; Maximum speed up to $2500\text{ rpm}$.

• Technical Coding Identifiers Deconstruction:

  • Model Reference: HGP-1A-F8R

    • HGP-1A: Denotes compact size 1A frame series with a 2-bolt diamond flange mounting configuration.

    • F: Flange connection style (alternative G or PT thread connection types available).

    • 8: Calibrated to $7.8\text{ ml/rev}$ output capacity.

    • R: Clockwise (Right-Handed) rotation looking from the front of the shaft end.

  • Model Reference: HGP-4A-F50R

    • HGP-4A: High-volume frame size 4A series casing.

    • 50: Calibrated to $50.3\text{ ml/rev}$ output capacity.

    • R: Clockwise (Right-Handed) rotation configuration.

• Drive Shaft Profiles: Straight Keyed, Multi-Tooth Involute Spline, or Tang Drive Couplings.

• Volumetric Efficiency Performance: Rated at $\ge 93\%$ under nominal operation.

Key Technical Advantages

• Axially Pressure-Balanced Floating Thrust Plates: Features advanced thrust plates loaded dynamically by an internal hydrostatic feedback pocket. This mechanism forces the plates against the gear faces during operation, eliminating axial gap expansion due to thermal growth or mechanical wear, ensuring high volumetric efficiency under continuous $21\text{ MPa}$ loading.

• Precision-Ground Involute Gear Profiles: The driving and driven gear sets are forged from specialized high-tensile alloy steel, through-hardened, and CNC-ground to micro-tolerances. The modified involute geometry minimizes oil entrapment shock pulses between teeth, lowering active operating noise by 6-8 dB compared to standard gear pumps.

• High-Tensile Extruded Aluminum Alloy Casting Casing: The HGP-1A body is extruded from aviation-grade high-density aluminum alloy. This metal structure boasts excellent fatigue life and yield resistance, preventing internal casing deformation or stress cracking under high-frequency hydraulic shock pulses.

• Composite Self-Lubricating DU Journal Bearings: Equipped with steel-backed journal sleeves lined with a composite matrix of PTFE and sintered bronze. These bushings support high radial loads and maintain a reliable low-friction fluid film, extending drive shaft service life under high continuous load pressures.

Application Areas

The high-pressure HGP-1A and HGP-4A series gear pumps are integrated into compact hydraulic architectures across multiple sectors:

• Industrial Machine Tools & Automation Lines: Powering tool clamping mechanisms, scissor lift platforms, and quick-fill sub-circuits for metal forming brakes.

• Material Handling & Warehouse Logistics: Primary lift pumps for hydraulic forklifts, tail lifts, and industrial dock levelers.

• Environmental & Municipal Utility Fleet Vehicles: Actuating waste compactor cylinders and sweeping disc motor circuits on municipal vehicles.

Expert Maintenance Tips

• The Pump Must Be Manually Pre-Filled with Clean Hydraulic Oil Through the Suction Port Prior to Start-Up: Running the unit dry, even for a few seconds during initial start-up, will destroy the component. Without a lubricating oil film, the gear faces will immediately score and gall against the thrust plates, causing terminal mechanical failure.

• Do Not Use an Iron Hammer to Strike the Shaft End When Mounting Couplings: Heavy axial impacts applied directly to the drive shaft can damage the alignment of the internal floating thrust plates and rupture the internal backup seals, causing internal cross-port leakage or mechanical binding upon startup.

• Ensure Proper Reservoir Fluid Levels and Install a 100-Mesh Suction Strainer to Prevent Air Ingress: Gear pumps are sensitive to cavitation and fine particulate wear. If fluid levels drop or air enters a loose suction line, the resulting air bubbles will implode violently within the gear teeth, eroding the internal casing walls and destroying the shaft oil seal.