CBXZ-C Compound Gear Pump

CBXZ-C Compound Gear Pump Full Product Introduction

 

1. Basic Product Overview

 

The CBXZ-C Compound Gear Pump is an integrated tandem dual-section Hydraulic gear pump with a shared input drive shaft, developed based on mature external meshing gear processing technology. Different from a single independent Hydraulic gear pump that only feeds one oil circuit, this compound structure integrates a high-pressure main pumping section and a low-pressure auxiliary pumping section in one compact pump housing. It acts as a multi-functional power supply component in compact and integrated hydraulic system of loaders, agricultural machinery, sanitation vehicles and small engineering machinery. The main pump delivers high-pressure hydraulic oil for working actuators, while the auxiliary pump supplies pilot oil, steering power or lubricating oil for gearboxes. It simplifies pipeline arrangement of the whole hydraulic system and cuts installation space, realizing one-shaft driving dual oil output for diversified hydraulic demands.

 

Model Interpretation

 

- CBXZ: Series code for tandem compound gear pump

- C: Pressure grade designation, representing medium-high pressure structural configuration, with reinforced gear and bearing assembly for heavy-load continuous operation

The pump features two independent oil outlets without mutual interference, widely customized with different displacements for matched main and auxiliary circuits.

 

2. Core Technical Parameters

 

Item Specification 

Product Type Tandem Compound Dual-circuit Hydraulic gear pump 

Rated Pressure Main pump: 16MPa; Auxiliary pump: 6MPa 

Peak Pressure Main pump: 20MPa; Auxiliary pump: 9MPa 

Rotational Speed Range 700–2400rpm 

Main & Auxiliary Displacement Multiple combined specifications customizable on request 

Pump Body Material Die-cast aluminum alloy housing, carburized quenched alloy steel gears 

Sealing Assembly NBR oil-resistant seals as standard; FKM high-temperature seals optional 

Applicable Medium ISO VG46, VG68 anti-wear hydraulic oil 

Operating Temperature -20℃ ~ +85℃ 

Mounting Type Standard flange mounting, engine PTO direct drive 

Warranty Period 1 year 

 

3. Structure & Working Principle

 

This compound unit consists of a shared driving shaft, two groups of external meshing gear pairs, front and rear pump cavities, integrated end covers and independent oil port assemblies. It is driven synchronously by the engine power take-off and works collaboratively with valves and actuators inside the complete hydraulic system:

 

1. The shared drive shaft rotates to drive two sets of gear pairs simultaneously, creating negative pressure at both suction ports to draw hydraulic oil from a common oil tank.

2. The main pumping chamber operates as a standard heavy-duty Hydraulic gear pump, outputting high-pressure oil to drive hydraulic cylinders and hydraulic motors for lifting, pushing and walking working actions.

3. The auxiliary pumping chamber provides steady low-pressure flow for steering assistance, solenoid valve pilot control or reducer circulating lubrication.

4. Two oil circuits operate separately without cross-flow; excess oil can bypass back to the tank under idle conditions to reduce energy consumption.

5. Compared with installing two separate Hydraulic gear pump units, the integrated compound design reduces connecting pipelines and leakage points, improving overall operational stability of the hydraulic system.

 

4. Core Product Advantages

 

1. Integrated one-shaft dual-pump design replaces two discrete Hydraulic gear pump units, greatly simplifying complicated piping layout of the hydraulic system and lowering assembly and maintenance costs.

2. Reasonable pressure gradient matching between main and auxiliary pumps realizes rational power distribution, avoiding idle power waste of the main power unit.

3. Adopts precision gear grinding technology of conventional industrial Hydraulic gear pump, featuring low flow pulsation and high volumetric efficiency, adapting to long-time continuous vibration working conditions.

4. Reinforced C-grade structural design enhances anti-overload capacity, effectively resisting instantaneous pressure surges to protect downstream components of the hydraulic system.

5. Standardized mounting dimensions support direct replacement of old compound pumps for equipment renovation, with easy spare parts procurement and strong universality.

6. Compact overall structure fits narrow engine compartments of small and medium machinery, with good heat dissipation to prevent hydraulic oil high-temperature deterioration.

 

5. Typical Application Scenarios

 

1. Small wheel loaders integrated hydraulic system: Main pump drives bucket and boom cylinders, auxiliary pump supplies steering power oil;

2. Large harvesters, agricultural engineering machinery: Main pump for harvesting mechanism drive, auxiliary pump for transmission box lubrication;

3. Road sweepers and small road maintenance equipment: Dual-circuit supply for working actuators and pilot control loops;

4. Hydraulic system upgrading modification: Replace split dual Hydraulic gear pump to optimize equipment internal layout.