CBG2/2 Dual External Gear Pump

CBG2/2 Dual External Gear Pump Full Product Introduction

 

1. Basic Product Overview

 

CBG2/2 Dual External Gear Pump is a classic medium-high pressure coaxial integrated dual combined hydraulic gear pump, mainstream produced by domestic hydraulic manufacturers (HCHC Changyuan Hydraulic, Wuxi Youli Hydraulic etc.). The marking 2/2 means both front and rear pump sections adopt identical CBG2 frame size series, with unified pressure grade, supporting same or different displacement pairing design. It integrates two sets of external meshing straight gear assemblies inside one high-strength aluminum alloy pump housing, sharing one driving shaft. With single power input, it outputs two fully independent hydraulic oil supplies for dual branches of open-loop hydraulic systems, commonly matched as large-displacement main working pump + small-displacement steering/pilot auxiliary pump. It serves as OEM original fitting and aftermarket replacement spare part for wheel loaders, forklifts, road rollers, agricultural harvesters and light mining machinery.

 

Model Code Explanation

 

- CBG: General series code of medium-high pressure industrial & engineering machinery external gear pump

- 2: Frame No.2 (medium frame standard specification, mainstream displacement range: 32/40/50/63/80/100 mL/r)

- 2/2: Dual pump combination, front pump and rear pump both belong to CBG2 frame series, consistent pressure rating

- Suffix optional: B (square flange mounting), F (flange-type oil ports); shaft options: plain key, rectangular spline, involute spline; rotation: clockwise R / counterclockwise L

 

2. Core Technical Parameters

 

Item Specification 

Product Type Same-frame Coaxial Dual Combined External Meshing Hydraulic Gear Pump 

Rated Working Pressure Both sections: 20MPa 

Instant Peak Pressure Both sections: 25MPa 

Rotational Speed Range 600–2500rpm 

Displacement Combination Customizable pairing: 32/32, 40/32, 50/40, 63/50, 80/63, 100/80 mL/r 

Pump Body Material High-strength die-cast aluminum alloy integral housing, carburized quenched alloy steel precision straight gears 

Core Structure Floating side plate axial clearance auto-compensation, radial hydraulic balance structure, DU composite self-lubricating bearings 

Sealing Assembly HNBR nitrile rubber seals standard; FKM high-temperature seals optional 

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

Operating Temperature -20℃ ~ +90℃ 

Mounting Form Standard square SAE flange mounting, engine PTO direct drive 

Volumetric Efficiency Single section ≥92% 

Warranty Period 1 year 

 

3. Structure & Working Principle

 

Composed of shared main drive shaft, two groups of driving/driven gear pairs, isolated segmented pump cavities, floating compensation side plates, DU bearings and independent inlet/outlet ports for two sections:

 

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

2. Two pump sections deliver pressurized oil to separate hydraulic branches: large-displacement section drives boom, bucket, walking hydraulic cylinders/motors for heavy-load main operation; small-displacement section supplies constant flow for hydraulic steering, multi-way valve pilot control and gearbox lubrication loops.

3. Each pump section is equipped with floating side plate compensation mechanism: system pressure pushes side plates to closely fit gear end faces, automatically offset axial wear clearance, minimize internal leakage and maintain stable efficiency during long continuous operation.

4. Two oil passages are completely isolated without cross oil leakage, realizing synchronous action of main and auxiliary equipment; return oil from two branches converges back to oil tank to complete hydraulic circulation.

5. Coaxial integrated structure eliminates redundant brackets and couplings, reducing mechanical friction loss and installation footprint compared to two separate single pumps installation.

 

4. Core Product Advantages

 

1. CBG2 unified 2/2 same-frame design ensures consistent pressure stability of two circuits, easy to realize synchronous dual actuators or main-auxiliary loop matching, strong versatility for equipment modification.

2. Lightweight high-rigidity aluminum alloy housing reduces whole machine load, compact overall size fits narrow engine compartments of medium-sized mobile machinery, plug-and-play replacement without modifying original mounting structure.

3. Radial hydraulic balance + DU self-lubricating bearings reduce gear eccentric wear, excellent anti-pollution performance tolerating tiny impurities in on-site hydraulic oil.

4. Mature floating side plate compensation technology slows efficiency attenuation after long-hour heavy-load operation, effectively preventing overall hydraulic system pressure drop.

5. Standard square flange installation and multiple shaft types fully interchangeable with domestic mainstream OEM pumps, convenient for after-sales maintenance replacement.

6. Rich displacement combination options support personalized hydraulic system matching for different machinery models.

 

5. Typical Application Scenarios

 

1. Dual-circuit hydraulic power pump for 3–6 ton wheel loaders integrated hydraulic system: main pump for loading mechanism, auxiliary pump for hydraulic steering;

2. Core oil supply component for heavy-duty internal combustion forklifts, mini road rollers and asphalt small pavers;

3. Large combine harvesters, forestry machinery for harvesting execution and walking auxiliary loops;

4. Small underground mining haulage vehicles, sanitation garbage trucks hydraulic power assembly;

5. Old equipment renovation: replace scattered single pumps to simplify overall hydraulic piping layout.