Compound Gear Oil Pump CBW/FB-E3

Compound Gear Oil Pump CBW/FB-E3 Full Product Introduction

 

1. Basic Product Overview

 

CBW/FB-E3 compound tandem gear pump is an integrated dual-section combined hydraulic power unit evolved from standard single Hydraulic gear pump, adopting one shared drive shaft to integrate high-pressure main pumping chamber and constant-flow auxiliary pumping chamber into one compact pump body. Differentiated from independent single Hydraulic gear pump that only serves one oil circuit, this compound pump realizes synchronous oil supply for main working loop, steering pilot loop and lubrication auxiliary loop simultaneously, acting as the core power source for compact dual-circuit hydraulic system on loaders, road rollers, agricultural harvesters and sanitation engineering vehicles. It inherits mature external meshing gear precision machining craft of industrial-grade Hydraulic gear pump, optimizing engine compartment piping layout and cutting assembly cost, perfectly matching multi-group hydraulic cylinders and hydraulic motor combined operation requirements.

 

Model Breakdown

 

- CBW: Universal series code for combined compound gear pump

- FB: Structure code (F for flange oil port connection, B for built-in constant flow valve integrated design)

- E: Pressure grade marking, rated working pressure 16MPa, peak pressure up to 20MPa

- 3: Gear modulus specification + standardized E-type 3# mounting flange, matched with SAE involute spline drive shaft for mainstream equipment power take-off interface

Product positioning: Main pump section supplies high-pressure oil for driving actuators; auxiliary pump with built-in constant flow structure provides stable oil for steering priority, pilot control and reducer lubrication circuits.

 

2. Core Technical Parameters

 

Item Specification 

Product Type Tandem Compound Dual-section External Meshing Gear Pump (Upgraded assembly of conventional Hydraulic gear pump) 

Main Pump Displacement Customizable range: 12–50mL/r 

Auxiliary Pump Displacement Customizable range: 6–25mL/r 

Rated Pressure (E grade) 16MPa; Max Peak Pressure 

Rotational Speed Range 800–2800rpm 

Drive Mode SAE involute spline shaft direct PTO drive 

Pump Body Material High-strength die-cast aluminum alloy shell, carburized alloy steel precision ground gears 

Sealing Kit NBR nitrile rubber seals standard; FKM high-temperature resistant seals optional 

Applicable Medium ISO VG46, VG68 anti-wear hydraulic oil 

Operating Temperature -20℃ ~ +85℃ 

Mounting Form E-type 3# standard flange mounting 

Special Configuration Auxiliary pump built-in constant flow valve assembly 

Warranty Period 1 year 

 

3. Structure & Working Principle

 

Composed of front auxiliary pump cavity (with built-in constant flow valve), rear main pump cavity, shared driving shaft, two sets of meshing gear pairs and integrated front/rear end covers. Driven synchronously by engine power take-off shaft, it cooperates with valves and hydraulic motor assemblies inside the whole machine hydraulic system:

 

1. Shared drive shaft rotates to drive two groups of gear pairs simultaneously; negative pressure forms on suction sides of both cavities to draw hydraulic oil from the shared oil tank.

2. Main pump cavity delivers high-pressure hydraulic oil to main working circuit, pushing hydraulic cylinders and hydraulic motor to complete lifting, traveling and compaction heavy-load actions, functioning identically to an independent heavy-duty Hydraulic gear pump.

3. Auxiliary pump equipped with FB constant flow valve automatically stabilizes output flow regardless of rotating speed fluctuation, supplying constant oil for steering system, solenoid pilot control or walking reducer forced lubrication.

4. Two oil outlets are fully independent without mutual interference; surplus oil can bypass back to oil tank for energy saving under idle working condition.

5. Compared with two separate installed Hydraulic gear pump, the integrated compound structure eliminates redundant transmission parts and connecting pipelines, lowering power loss and external leakage risks of the whole hydraulic system.

 

4. Core Product Advantages

 

1. One-shaft dual-pump integrated design replaces two discrete Hydraulic gear pump units, greatly simplifying complex hydraulic system pipeline arrangement and reducing equipment assembly workload and failure points.

2. FB built-in constant flow valve design ensures auxiliary circuit flow stability even under engine variable speed conditions, guaranteeing sensitive steering and stable pilot control performance.

3. Adopts high-precision gear grinding technology from standard Hydraulic gear pump, featuring low flow pulsation and high volumetric efficiency, maintaining stable oil supply during long-duration high-speed continuous operation.

4. Integral aluminum alloy die-cast pump body owns high structural rigidity and excellent heat dissipation, adapting to severe vibration and high-temperature working environments of off-road engineering and agricultural machinery.

5. E3 standardized flange and spline shaft mounting boast strong universality, supporting direct replacement of old compound pumps for equipment renovation with easy spare parts procurement.

6. Dual-circuit independent pressure protection design avoids overpressure damage to delicate pilot and lubrication loops, improving overall operational safety of the complete hydraulic system.

 

5. Typical Application Scenarios

 

1. Loader integrated hydraulic system: Main pump drives boom/bucket cylinders and walking hydraulic motor, constant-flow auxiliary pump supplies steering system priority oil;

2. Asphalt pavers, road rollers: Main pump for compaction vibration and roller hydraulic motor drive, auxiliary pump for hydraulic valve pilot oil supply;

3. Large agricultural harvesters: Main pump for harvesting mechanism hydraulic drive, auxiliary pump for gearbox centralized circulating lubrication;

4. Refitting engineering machinery hydraulic upgrading: Replace two split Hydraulic gear pump to optimize compact engine compartment layout;

5. Small mobile hydraulic stations: Dual-circuit configuration for main actuator driving and auxiliary cooling/filter circulation oil supply.