CBKP Dual External Gear Pump

CBKP Dual External Gear Pump Full Product Introduction 

1. Basic Product Overview

 

The CBKP Dual External Gear Pump is a heavy-duty coaxial integrated dual combined Hydraulic gear pump developed for heavy construction machinery, mining equipment and heavy agricultural machinery, Unlike installing two separate standalone Hydraulic gear pump units, it integrates two sets of external meshing gear assemblies inside one liquid-extruded high-strength aluminum alloy housing, sharing a single main drive shaft. With one power input, it delivers two independent hydraulic oil outputs to serve two separate branches of heavy-load hydraulic system, generally configured as large-displacement main pump for working actuators + small-displacement auxiliary pump for hydraulic steering, pilot valve control or transmission lubrication circuits. It is widely adopted as OEM original fitting and aftermarket replacement spare part for truck cranes, large wheel loaders, heavy dump trucks, road rollers and underground mining haulage vehicles.

 

Model Code Explanation

 

- CBK: Core series code for high-pressure engineering machinery gear pump

- P: Upgraded heavy-duty version with liquid extruded housing, reinforced roller bearings and radial hydraulic balance bushings

- Dual: Two coaxially integrated pump sections, each equipped with independent suction and pressure oil ports without cross-circuit oil leakage

Customizable displacement combinations (32/40/50/63/80/100mL/r mainstream specifications); optional flat key, rectangular spline, SAE involute spline shaft, clockwise/counterclockwise rotation direction.

 

2. Core Technical Parameters

 

Item Specification 

Product Type Coaxial Dual Combined External Meshing Hydraulic gear pump 

Rated Working Pressure Both sections: 20MPa (200bar) 

Instant Peak Pressure Both sections: 25MPa (250bar) 

Rotational Speed Range 700–2400rpm 

Displacement Combination Two sections with independent customizable displacements 

Pump Body Material Liquid extruded high-strength aluminum alloy main housing, cast iron end covers; carburized quenched alloy steel precision gears 

Core Structure Floating side plate axial clearance automatic compensation, radial hydraulic balance bushings, heavy-duty tapered roller bearings + DU self-lubricating composite bearings 

Sealing Kit HNBR oil-resistant seals standard; FKM high-temperature resistant seals optional 

Applicable Hydraulic Medium ISO VG46, VG68 anti-wear hydraulic oil 

Operating Temperature -20℃ ~ +90℃ 

Mounting Form Square SAE standard flange mounting, engine PTO direct drive; reserved auxiliary mounting screw holes at pump tail 

Volumetric Efficiency Single section ≥92% 

Warranty Period 1 year 

 

3. Structure & Working Principle

 

Consists of shared main drive shaft, two groups of driving/driven gear pairs, segmented independent pump cavities, floating compensation side plates, heavy-duty bearings and separated oil inlet/outlet ports for two sections, acting as centralized dual-circuit power core of the whole hydraulic system:

 

1. External power drives the common main shaft to rotate synchronously, two gear groups operate simultaneously; each suction cavity generates negative pressure to draw hydraulic oil from the shared oil tank.

2. Every pump section conveys pressurized hydraulic oil to its exclusive branch pipeline of the hydraulic system: the large-displacement main pump drives boom, bucket and heavy-load walking hydraulic cylinders/motors; the small-displacement auxiliary pump supplies stable flow for hydraulic steering, multi-way valve pilot control and gearbox lubrication loops.

3. Each pump section adopts the mature floating side plate compensation structure of standard single Hydraulic gear pump, which is pressed against gear end faces by system pressure to offset axial wear clearance in real time, minimizing internal leakage and maintaining long-term stable volumetric efficiency.

4. Two hydraulic branches run in parallel with fully isolated oil passages without oil cross-contamination, enabling synchronous execution of main working and auxiliary actions; all return oil converges back to the oil tank to complete full hydraulic circulation.

5. Coaxial integrated design eliminates redundant transmission brackets and couplings, cutting mechanical friction and power loss compared to installing two discrete Hydraulic gear pump units side by side.

 

4. Core Product Advantages

 

1. Liquid extruded aluminum alloy housing features ultra-high structural rigidity, outstanding shock resistance and overload capacity, perfectly adapting to dusty, high-vibration mining and rugged construction site environments.

2. Radial hydraulic balance bushings + heavy-duty roller bearings greatly reduce gear eccentric abrasion, with superior anti-pollution performance to tolerate tiny impurities mixed in on-site hydraulic oil.

3. Independent customization of displacement for two pump sections realizes refined power distribution matching different actuator loads, reducing idle energy consumption and improving overall energy utilization of the hydraulic system.

4. Floating side plate automatic compensation prevents efficiency decline caused by long-hour continuous gear wear, effectively avoiding overall pressure drop of the hydraulic system.

5. Unified square flange mounting interface supports integral plug-and-play replacement during overhaul, no large-scale reconstruction required for the original hydraulic system.

6. Multiple shaft types and rotation directions are compatible with most domestic and imported heavy machinery mainframe installation standards.

 

5. Typical Application Scenarios

 

1. Core dual-circuit oil supply Hydraulic gear pump for truck cranes and large wheel loaders’ integrated hydraulic system: main section for hoisting/loading actions, auxiliary section for hydraulic steering;

2. Hydraulic power assembly for heavy-duty road rollers, asphalt pavers driving vibration motors, walking mechanisms and auxiliary actuators;

3. Heavy underground mining haulage vehicles, bulk material handling special engineering machinery matched hydraulic power unit;

4. Equipment renovation upgrade: replace scattered single pumps to streamline overall hydraulic pipeline layout of old heavy machinery.