Nihon Speed K1P Series Micropump | K1P1R11A K1P4R11A K1P7R11A K1P9R11A | High Pressure Gear Pump

The Nihon Speed K1P Series premium industrial-grade high-pressure micro hydraulic gear pumps manufactured by Chengyuan Hydraulic are high-efficiency fluid power components engineered to match the technical metrics of Nihon Speed (Shimadzu group framework). This light-duty aftermarket alternative matrix systematically encompasses critical low-displacement, high-speed single pumps operating across automated machine islands and compact power setups, including the K1P1R11A, K1P2R11A, K1P3R11A, K1P4R11A, K1P6R11A, K1P7R11A, and the high-output K1P9R11A variant.

Operating as the reliable primary energy heart within high-frequency CNC lathe chucks, auxiliary clamping manifolds on small die-casting machinery, and automated workplace positioning jigs, a micro-sized gear pump’s volumetric efficiency under cyclic pressure loading dictates circuit holding capacity and system runtime. Chengyuan guarantees 100% original-place drop-in interchangeability across all assemblies concerning standard 4-bolt square mounting pilots, rectangular alignment flanges, straight cylindrical keyed drive shafts, and side-ported internal threaded layouts. Prior to shipment, every single gear pump matrix undergoes 100% full-capacity simulated pressure, maximum speed, and thermal slip verification tests on automated digital benches, ensuring continuous stability up to 21.0 MPa.

Technical Specifications

• Compatible Brand: Nihon Speed / Shimadzu (Industrial Micro Hydraulic Standard)

• Target Replacement Configurations: K1P1R11A, K1P2R11A, K1P3R11A, K1P4R11A, K1P6R11A, K1P7R11A, K1P9R11A

• Geometric Volumetric Displacement Rating ($cm^3/rev$):

  • K1P1 Variant: 0.9 $cm^3/rev$

  • K1P2 Variant: 1.7 $cm^3/rev$

  • K1P3 Variant: 2.6 $cm^3/rev$

  • K1P4 Variant: 3.5 $cm^3/rev$

  • K1P6 Variant: 5.2 $cm^3/rev$

  • K1P7 Variant: 6.0 $cm^3/rev$

  • K1P9 Variant: 7.8 $cm^3/rev$

• Rated Continuous Operating Pressure: 21.0 MPa (210 bar / 3045 psi)

• Maximum Allowable Peak Pressure: 24.5 MPa (245 bar / 3550 psi)

• Operational Drive Speed Range: 500 rpm – 4000 rpm (High speed electric motor direct-coupled profile)

• Rotation and Shaft Interface Code: The R designation specifies standard Clockwise rotation viewed from the drive shaft end, while the suffix 11A defines the standard 4-bolt square mounting pilot paired with a straight cylindrical keyed shaft.

• Factory Calibrated Volumetric Efficiency: $\ge 93\%$ (verified at 1,800 rpm under full rated load test conditions)

• Total Assembly Structural Weight: Approx. 1.1 kgs to 1.6 kgs (Ultra-compact architecture with high power density ratio)

Key Technical Advantages:

• High-Strength Forged Extruded Aluminum Alloy Housing: The primary K1P shell is sculpted from premium aerospace-grade aluminum alloy, formed under continuous heavy extrusion pressing. This dense metallurgical structure limits housing expansion under 21.0 MPa peak hydraulic shock waves, effectively mitigating volumetric slippage under high temperatures and preventing mechanical casing fatigue.

• Axial Hydrostatic Balance with ‘3’-Shaped Floating Thrust Plates: The inner rotating core implements floating side thrust plates paired with high-pressure, ‘3’-shaped fluoroelastomer sealing tracks. By routing a precise volume of pressurized fluid behind the plates, the plates adjust tightly against the gear faces, maintaining a tight micron-level seal that self-compensates for long-term wear and keeps volumetric efficiency above 93%.

• Case-Hardened Micro-Ground Alloy Steel Integrated Gear Shafts: The integrated drive and driven gears are cut from premium low-carbon alloy steel (such as 20CrMnTi) using micro-precision hobbing, vacuum case-hardened, and finished via fine gear grinding. The tooth profile minimizes fluid trapping pulsations, dropping average noise emission curves to 60 dB(A).

• Heavy-Duty Self-Lubricating DU Bushing Bearing System: The rotating shaft journals are supported by high-capacity imported DU composite bearings (comprising a PTFE friction-reducing layer, a sintered bronze intermediate layer, and a rigid steel backing). Lubricated continuously by the system oil flow, this configuration absorbs radial shear stresses, keeping the shaft concentric at high speeds and protecting the cartridge from uneven wear.

Application Areas:

• High-Precision CNC Machine Tools & Automated Fixtures: Supplying dependable fluid power to hydraulic clamping rams, fast-acting chuck cylinders, and indexing lathe turret locking circuits.

• Compact Low-Noise Hydraulic Power Stations & Mini Power Packs: Serving as the primary low-noise power source for laboratory benches, small pressing jigs, and medical lift equipment.

• Forced Lubrication Circuits in Textile & Packaging Machinery: Supplying continuous pressure loops to high-frequency centralized grease lines and directing forced fluid cooling streams through flexographic printing drive gearboxes.

Expert Maintenance Tips:

• Mandatory Pre-Lubrication and Manual Shaft Rotation Prior to First Start: Because the K1P series features tightly matched running clearances, operating it dry will cause immediate component breakdown. During initial system mounting or following a reservoir oil change, you must pre-fill the pump cavity with clean fluid through the suction or discharge port and rotate the input shaft several turns manually. Jog the motor intermittently during startup. Never run the pump dry, or the aluminum thrust plates will lock and gall against the gear faces within seconds from dry friction heat.

• Zero Shock Impact Tolerances and Concentricity Controls Along the Drive Shaft: When securing the gear pump onto the electric motor adapter bracket, ensure the coupling and parallel key slide home smoothly. Never use a steel hammer or heavy tools to force the shaft coupling into position. Sudden axial impact loads can crack the internal plate alignment pins. Keep alignment concentricity tolerances strictly under $\le 0.05mm$ to protect the front lip seals from leaking under pressure.

• Enforce Clean Fluid Filtration Matrix to Eliminate Internal Scoring: Miniature high-pressure gear components are vulnerable to fine particulate abrasive scraping. Total loop fluid cleanliness must be held at or above ISO 4406 20/18/15, backed by a $\le 100$ mesh inlet suction strainer that is inspected routinely. Allowing debris or oxidized carbon carbon soot to settle in the fluid will score the bushing faces, causing severe pressure drops when hot, accompanied by high-pitched acoustic squealing.