IPN5-64 141 Voith Internal Gear Pump 64.2cc

Product Overview

The Voith IPN5-64 141 is a fixed-displacement internal gear pump from the Voith Turbo IPN low-pressure internal gear pump series.

Voith’s historical G1418 documentation identifies IPN as a low-pressure internal gear pump range and highlights compact dimensions, low operating noise, low flow and pressure pulsation, high volumetric efficiency and high overall efficiency. The design incorporates the Voith Superlip® radial gap compensation principle and volume-optimized involute gearing.

For the specific IPN 5-64 configuration, Voith specifies an actual geometric displacement of 64.2 cm³/rev, a speed range of 400–2500 rpm, 100 bar continuous pressure and 125 bar peak pressure. At 1500 rpm, the published delivery is 96.3 L/min under the stated test conditions.

The suffix 141 provides an important mechanical configuration: 1 indicates clockwise rotation with radial suction, 4 indicates a VDMA two-hole flange, and the final 1 identifies a parallel shaft with keyway connection.

For replacement engineering, displacement alone is not sufficient. Rotation, suction arrangement, flange standard, shaft type, shaft extension and installation dimensions must all be verified.

Technical Specifications

IPN5-64 141

• Manufacturer: Voith Turbo
• Series: IPN
• Product Type: Low-Pressure Internal Gear Pump
• Design: Internal gear pump with radial gap compensation
• Compensation Principle: Voith Superlip®
• Size: IPN 5-64
• Geometric Displacement: 64.2 cm³/rev
• Continuous Pressure: 100 bar / 10 MPa
• Peak Pressure: 125 bar / 12.5 MPa
• Minimum Speed: 400 rpm
• Maximum Speed: 2500 rpm
• Delivery at 1500 rpm: 96.3 L/min
• Rotation: Clockwise
• Suction Arrangement: Radial suction port
• Mounting Flange: VDMA 2-hole flange
• Shaft Type: Parallel shaft with keyway connection
• Input Pressure: 0.8–3 bar absolute
• Short-Time Start-Up Pressure: 0.6–3 bar absolute
• Hydraulic Fluid: HLP mineral oils according to DIN 51524 Part 2 or 3
• Normal Viscosity Range: 10–300 mm²/s
• Maximum Start-Up Viscosity: 2000 mm²/s
• Permissible Fluid Temperature: -20°C to +80°C
• Ambient Temperature: -10°C to +60°C
• Filtration: Minimum β20 ≥ 75; recommended β10 ≥ 100 for longer service life
• Required Cleanliness: NAS Class 8
• Approximate Weight: 11.3 kg
• Permitted Drive-Shaft Input Torque: 295 Nm
• Permitted Secondary-Shaft Torque: 200 Nm
• Control: Fixed displacement; flow changes through drive-speed variation rather than variable pump displacement
• Reference Test Conditions: Mineral oil at 20–40 mm²/s and input pressure of 0.8–3.0 bar.

Peak Pressure Limitation

The 125 bar peak-pressure rating is not a continuous operating pressure. Voith specifies peak pressure for a maximum of 15% of operating time with a maximum cycle time of one minute.

Model Code Interpretation

For IPN5-64 141:

• IPN = Voith IPN internal gear pump series
• 5 = pump size 5
• 64 = nominal size corresponding to 64.2 cm³/rev actual displacement
• 1 = clockwise rotation with radial suction port
• 4 = VDMA two-hole flange
• 1 = parallel shaft with keyway connection

These suffix definitions are based on the historical Voith IPN coding documentation.

Key Technical Advantages

1. Superlip® Radial Gap Compensation

The IPN series uses Voith’s Superlip® radial gap compensation principle to control the internal hydraulic chamber clearance.

From an engineering perspective, radial gap management helps minimize internal leakage and supports volumetric efficiency across changing operating-pressure conditions.

2. Volume-Optimized Involute Gearing

Voith specifies volume-optimized involute gearing for the IPN series. Optimized tooth geometry supports efficient hydraulic displacement and contributes to reduced flow and pressure pulsation.

3. Low Noise and Low Pulsation

Voith lists very low flow and pressure pulsation and low noise levels among the key characteristics of the IPN range.

These characteristics are valuable for presses, plastic-processing systems, conveying machinery and industrial hydraulic power units where hydraulic excitation and mechanical noise must be controlled.

4. High Volumetric Efficiency

The combination of radial gap compensation and optimized internal gearing is intended to reduce leakage losses. Voith explicitly identifies high volumetric efficiency and high overall efficiency as IPN product characteristics.

5. 64.2 cm³/rev Medium-Large Displacement

The IPN5-64 provides 64.2 cm³/rev geometric displacement.

At 1500 rpm:

64.2 × 1500 ÷ 1000 = 96.3 L/min

This agrees with the published Voith delivery value at 1500 rpm. Actual delivered flow depends on volumetric efficiency, operating pressure, oil viscosity and inlet conditions.

6. Wide Hydraulic-Fluid Viscosity Range

Voith specifies a normal viscosity range of 10–300 mm²/s and a maximum permissible start-up viscosity of 2000 mm²/s.

This provides flexibility across different hydraulic temperatures and starting conditions, although final fluid selection should always follow the host-machine requirements.

7. Multi-Pump Capability

Voith states that IPN pumps can be combined into dual-flow or multi-flow pump assemblies, and they can also be combined with other Voith internal gear pump series for broader hydraulic applications.

Application Areas

Voith’s IPN documentation identifies applications including:

• Plastic-processing machinery
• Sheet-metal processing equipment
• Hydraulic presses
• Conveying equipment
• Lifting equipment
• Shipbuilding systems
• Municipal vehicles
• Power-plant auxiliary equipment
• Special-purpose machinery
• Industrial hydraulic power units

The published IPN documentation specifically references plastics processing, sheet-metal processing, presses, conveying and lifting equipment, shipbuilding, municipal vehicles, power plants and special machine building.

With 64.2 cm³/rev displacement and a maximum speed of 2500 rpm, the IPN5-64 is suited to medium-to-high flow industrial hydraulic circuits rather than ultra-high-pressure applications.

Expert Maintenance Tips

1. Prime and Vent Before Commissioning

Before startup, ensure the pump cavity and suction circuit are filled with hydraulic fluid.

Voith’s documentation identifies a threaded plug that can be used for filling or venting depending on pump orientation. The M10×1 plug is specified to be tightened to 10 Nm during pumping operation.

2. Maintain Correct Inlet Pressure

Maintain the normal suction-side absolute pressure within 0.8–3 bar, with only brief startup operation permitted at approximately 0.6–3 bar absolute.

Excessive suction-line restriction can increase cavitation risk, noise and flow loss.

3. Respect the Peak-Pressure Duty Cycle

The 125 bar peak pressure is a short-duration limit rather than a continuous operating pressure. Voith specifies that peak pressure may apply for no more than 15% of operating time with a maximum one-minute cycle time.

4. Check Shaft Alignment

The 141 suffix identifies a parallel keyed shaft. Coupling alignment must be controlled carefully to avoid excessive radial or axial loading on the shaft and bearing system.

5. Verify the VDMA Two-Hole Flange

The middle digit 4 in 141 identifies the VDMA two-hole mounting flange. Replacement pumps should be checked for locating diameter, bolt-hole pattern, shaft extension and mounting depth instead of relying on general external dimensions alone.

6. Maintain Hydraulic Cleanliness

Voith specifies a minimum filtration performance of β20 ≥ 75 and recommends β10 ≥ 100 for longer service life, with hydraulic-fluid cleanliness around NAS Class 8.

Contamination can increase wear at the gear, bearing and compensation interfaces, ultimately increasing internal leakage and reducing volumetric efficiency.

7. Verify the Complete Replacement Configuration

Before replacing an IPN5-64 141, verify:

• 64.2 cm³/rev displacement
• Clockwise rotation
• Radial suction connection
• VDMA two-hole flange
• Parallel keyed shaft
• Shaft extension
• Suction-port dimensions
• Pressure-port dimensions
• Installation envelope
• Actual operating speed
• Continuous operating pressure

A direct replacement should never be claimed from the IPN5-64 designation alone.

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