Gear oil pump QXV Series QXV26-008R QXV22-008R66

Product Positioning & Structural Upgrade

• The QXV26-008R belongs to the upgraded QXV26 frame series precision internal gear pump
• It is optimized and upgraded on the basis of the conventional QXV22 model
• Features improved structural rigidity, better oil absorption performance, and stronger continuous operation capability
• Working principle is fundamentally different from swashplate piston pumps and external gear pumps
• Adopts high-precision conjugate internal gear meshing technology
• Enables smooth, low-pulsation, low-turbulence fluid transmission for low-viscosity media

Performance Parameters & Operating Conditions

• Nominal displacement: 7.9cm³/r (8cc/r), ensuring micro-precision small-flow output
• Suitable for quantitative fluid supply scenarios
• Designed for medium and low-pressure working conditions
• Supports long-term stable operation under 50bar rated working pressure
• Temperature adaptability: -30℃ to +160℃
• R-type clockwise rotation design matches global mainstream equipment assembly direction
• Offers flexible installation and strong universality
• Optimized flow channel and gear tooth profile effectively suppress cavitation and flow fluctuation
• Ensures stable flow and pressure output even for ultra-thin fluids prone to leakage and pressure loss

Structural Reliability & Media Adaptability

Integrated modular aluminum alloy structure design

Upgraded reinforced bearings and thickened pump body wall compared with small-frame pumps

Equipped with a customized low-viscosity resistant sealing system

Suitable for thin media such as diesel, aviation kerosene, and hydraulic brake fluid

Effectively solves internal leakage and fast aging issues of ordinary gear pumps

Supports wide-range variable speed drive

Features excellent energy-saving performance and low heat generation

Standardization & Compatibility

Installation flange dimensions, shaft diameter, and oil port positions fully comply with international QXV standards

Ensures 100% plug-and-play interchangeability

No pipeline modification or equipment debugging required

Series Models

Core Product Advantages

1. Upgraded QXV26 Frame Higher Structural Rigidity

Compared with the traditional QXV22 small-frame pump, the Gear oil pump QXV Series QXV26-008R QXV22-008R66 adopts an upgraded 26-series medium frame structure with optimized overall structural size and enlarged stress-bearing area. The thickened integral die-cast aluminum alloy pump body effectively reduces structural deformation and vibration during high-speed operation, greatly improving overall operational stability. The internal bearing installation position is optimized to enhance bearing fit accuracy and load-bearing capacity, avoiding bearing deflection and abnormal wear during long-term continuous operation. This structural upgrade makes the pump more adaptable to complex working conditions with slight vibration and temperature changes, achieving longer service life and more stable output than ordinary small-frame gear pumps.

2. Excellent Low-viscosity Medium Sealing Performance

The QXV26-008R is professionally optimized for low-viscosity thin fluid transmission. Adopting multi-stage composite PTFE and high-temperature resistant rubber sealing components, it effectively adapts to various low-viscosity media including diesel oil, kerosene, brake fluid and water-oil emulsion. The precisely controlled gear matching gap and automatic gap compensation structure suppress internal leakage of thin fluids, maintaining high volumetric efficiency and stable pressure build-up. It solves the industry problems of weak pressure holding capacity, large flow attenuation and easy leakage of ordinary gear pumps when conveying low-viscosity fluids, ensuring continuous and uniform fluid supply for precision hydraulic and fuel systems.

3. Ultra-low Noise & Low Pulsation Operation

Equipped with optimized conjugate internal gear meshing technology, the Gear oil pump QXV Series QXV26-008R QXV22-008R66 realizes seamless smooth meshing without meshing impact and dead volume. The symmetrical flow channel design balances fluid compression and discharge, effectively reducing flow pulsation, hydraulic vibration and operating noise. Compared with external gear pumps, it has obvious advantages in quiet operation and running stability. It can maintain ultra-low noise operation during long-term high-speed working, fully meeting the noise control requirements of automotive supporting systems, industrial precision equipment and indoor automated production lines, avoiding equipment jitter and system instability caused by hydraulic pulsation.

4. Strong Environmental Adaptability & Easy Maintenance

The QXV26-008R features wide temperature resistance and strong anti-aging performance, stably adapting to -30℃ low temperature cold start and +160℃ high temperature continuous operation. The internal gear pair undergoes vacuum heat treatment and precision grinding, with high surface hardness and wear resistance, resisting long-term fluid erosion and meshing wear. The compact modular integrated structure simplifies internal components, reduces failure points and daily maintenance costs. The detachable assembly design supports quick disassembly, cleaning and replacement of wearing parts, with low later operation cost and high equipment compatibility, suitable for long-cycle uninterrupted industrial and mobile equipment operation.

Model Code Detailed Explanation

Each code of QXV26-008R corresponds to the product frame size, displacement, rotation direction and structural configuration, helping global buyers quickly complete accurate model selection and equipment matching:

QXV: High-performance internal gear pump series, specially developed for low-viscosity thin fluid transmission, featuring low noise and high efficiency;

26: Upgraded 26# medium frame size specification, higher structural rigidity, stronger stability than conventional 22# frame pumps;

008: Nominal displacement 7.9cc/r (8cc/r), micro small-flow precision displacement for quantitative fluid supply;

R: Clockwise rotation (viewed from the shaft extension end), standard universal rotation for global mainstream equipment.

Product Structure & Manufacturing Technology

1. Optimized Conjugate Internal Gear Transmission Structure

The QXV26-008R abandons the traditional external gear impact transmission mode and adopts upgraded high-precision conjugate internal gear pair structure. The optimized logarithmic tooth profile realizes continuous smooth meshing, eliminates fluid dead volume and meshing impact, and reduces flow turbulence and pressure loss. All gear tooth surfaces are processed by micron-level precision grinding and strict heat treatment process, with uniform matching gaps, which can effectively control the internal leakage of low-viscosity thin fluids and maintain stable volumetric efficiency under variable speed working conditions. The symmetrical internal force balance design reduces mechanical vibration and running noise, improving overall operation smoothness.

2. Low-viscosity Dedicated Sealing & Wear-resistant System

Aiming at the physical characteristics of easy leakage and strong permeability of thin fluids, the QXV26-008R is equipped with a professional multi-layer composite sealing system. Imported high-temperature and corrosion-resistant sealing materials are used for shaft seals and end face seals, which can resist long-term erosion of diesel, kerosene and brake fluid, and avoid aging and failure under high-temperature working conditions. The dynamic and static gap compensation structure automatically adapts to thermal expansion and cold contraction of components, ensuring stable sealing performance in alternating temperature environments. The upgraded wear-resistant bearing group ensures sufficient thin-fluid lubrication, preventing dry friction damage and extending the service life of core components.

3. High-rigidity Modular Integrated Process

The QXV26-008R pump body is made of high-strength die-cast aluminum alloy, with lightweight, high rigidity and anti-deformation characteristics. The upgraded 26-frame integral molding process optimizes the internal flow channel layout, reduces fluid resistance and cavitation risk, and improves oil absorption efficiency. Internal components are arranged in a modular manner, which simplifies the transmission structure, reduces mechanical energy loss and failure rate. Strict CNC precision machining and unified assembly standards ensure consistent batch performance of products, with high dimensional accuracy and interchangeability, meeting the strict matching requirements of precision fluid systems.

Application Scope

With its upgraded high-rigidity structure, stable low-viscosity fluid transmission performance, ultra-low noise operation and wide environmental adaptability, the QXV26-008R internal gear pump is widely used in various precision thin-fluid delivery scenarios. It is mainly applicable to automotive brake hydraulic systems, diesel engine fuel supply systems and mobile equipment auxiliary hydraulic stations. It also serves as core fluid supply equipment for industrial precision instruments, automated mechanical lubrication systems, water-oil emulsion conveying and special low-viscosity medium circulation systems. With stable quality, compact structure and strong universality, it is an ideal replacement part for engineering machinery, automobile manufacturing and industrial precision fluid equipment.

As a professional Chinese manufacturer and supplier of QXV series internal gear pumps, Hengmeisi adheres to strict quality control standards. Each QXV26-008R pump undergoes low-viscosity medium sealing test, high-temperature aging test and flow stability calibration before delivery to ensure stable performance and 100% interchangeability with original parts. With factory direct sales advantages, reliable product quality and perfect after-sales service, our products are well received by global customers and widely used in equipment maintenance and supporting procurement of various precision hydraulic systems.