Gear oil pump QX Series QX51-100/53-050R

1. Product Description

Hengmeisi Gear oil pump QX Series QX51-100/53-050R– China factory direct.

320 bar continuous (350 bar peak), 94% volumetric efficiency, >90% total efficiency. Ultra-low pulsation (≤0.2 MPa), high contamination resistance, quiet operation. Engineered for precision control and long-term reliability in demanding hydraulic systems.

2. Integrated Product Advantages

2.1 Internal Gear vs. External Gear Pump Designs

Unlike conventional external gear pumps that suffer from gear meshing losses and higher noise levels, the QX51-100/53-050R uses an advanced internal gear profile design. This eliminates vane friction and gear-to-gear wear, enabling higher pressure capacity, lower noise (up to 20dB reduction), and significantly longer service life. The result is a more efficient, quieter, and durable solution for critical hydraulic systems.

2.2 Ultra-Low Noise & Low Pulsation Operation

The precision-machined internal gear set ensures near-silent operation, even at maximum pressure and speed. With a flow pulsation as low as 0.2MPa, the pump delivers exceptionally smooth fluid power, which is essential for precision machine tools, continuous casting lines, and applications where vibration and noise must be minimized.

2.3 Premium Materials for Extreme Durability

Gear & Housing: High-strength alloy steel, precision ground and heat-treated for maximum wear resistance and pressure-bearing capacity.

Bearings: Heavy-duty tapered roller bearings designed to handle high radial and axial loads, supporting continuous operation at 3000 r/min.

Seals: High-performance FKM seals, rated for -30°C to +120°C, ensuring leak-free performance at maximum operating pressure.

2.4 Built-in Contamination Resistance

An optimized internal filtration path protects critical components from hydraulic oil impurities. This feature significantly reduces the risk of blockages and wear, ensuring long-term reliability in harsh environments with less-than-perfect fluid quality.

3. Model Code Explanation: QX51-100/53-050R

The model code QX51-100/53-050R follows a clear, industry-standard coding logic, making it easy for purchasers to identify key specifications without specialized hydraulic knowledge:

QX: Series identifier for high-pressure internal gear pumps, distinguishing from vane pumps and external gear pump series.

51: Series variant, indicating high-pressure continuous-duty construction.

100: Rated displacement of the primary stage (100 cm³/rev), suitable for medium-to-high flow hydraulic systems.

53: Secondary stage series designation, optimized for high-efficiency operation.

050: Rated displacement of the secondary stage (50 cm³/rev), enabling combined flow and pressure configurations.

R: Standard rotation direction (right-hand clockwise when viewed from the drive shaft end).

As the core model of the QX51 series, the QX51-100/53-050R is specially optimized for high-pressure, low-noise, and long-life scenarios. It is widely favored by global purchasers in heavy machinery, metallurgy, and marine supporting fields.

4. Product Structure

1. Core Architecture: Internal Gear & Crescent StructureThe heart of the pump is the internal gear and crescent assembly, which creates a continuous, pulsation-free flow path. This design eliminates the noise and wear associated with external gear pumps.

2. Dual-Stage Design: Combined 100/50 cm³/rev DisplacementThe dual-stage configuration allows the pump to deliver both high flow (at low pressure) and high pressure (at reduced flow), making it versatile for different hydraulic system requirements.

3.Material Upgrades:

Gears & Housing: High-grade alloy steel, precision machined and heat-treated for superior strength and wear resistance.

Bearings: Heavy-duty roller bearings, pre-lubricated for long service life.

Seals & O-rings: High-temperature and high-pressure resistant materials for reliable performance in extreme conditions.

4. Integrated Filtration & Pressure Compensation:The pump features built-in pressure compensation to automatically adjust for wear, maintaining consistent performance over time. The internal contamination control system prevents debris from damaging critical components.

5. Application Scenarios

The QX51-100/53-050R Internal Gear Pump is widely used in a variety of demanding applications:

Heavy Construction Equipment: Hydraulic excavators, wheel loaders, and mobile cranes requiring reliable power in harsh conditions.

Metallurgical Machinery: Continuous casting lines, rolling mills, and hydraulic presses where consistent pressure and low noise are critical.

High-Pressure Hydraulic Power Units: Industrial and mobile applications requiring high efficiency and low pulsation.

Marine Hydraulic Systems: Deck machinery, winches, and steering systems requiring leak-free, long-life performance.

High-End CNC Machine Tools: Precision machining centers and forging presses requiring smooth, vibration-free fluid power.

6. Hengmeisi Advantage

As a China-based manufacturer and direct factory supplier, Hengmeisi offers the QX51-100/53-050R with:

Factory-direct pricing without middleman markup

12-month warranty on all products

Fast lead times for standard and customized configurations

Professional technical support for application-specific recommendations