1. Model Code Definition
CBT‑F4/F4
1. CBT: General domestic code for externally meshed high‑pressure gear pump
2. F: Pressure grade, with rated operating pressure of 20 MPa and peak pressure of 25 MPa
3. 4: Gear module No.4; both front and rear pumps adopt the F4 series with the same module
4. /F4: Both front and rear sections are identical F4 series pump bodies, sharing one input shaft with two independent oil outlets
5. Duplex: Twin‑pump structure; one driving shaft actuates two independent pump cartridges, enabling dual‑circuit separate oil supply or combined high/low‑pressure oil supply
2. Key Technical Specifications (Industry Standard)
Pressure Parameters
- Rated operating pressure: 20 MPa
- Maximum instantaneous pressure: 25 MPa
- Allowable vacuum degree at suction port: ≤ 0.06 MPa
Displacement Options (Standard for F4 Series)
Front and rear pumps can be configured with same or different displacements. Common specifications:
F410 / F412.5 / F416 / F420 / F425 / F432 mL/r
Rotational Speed & Efficiency
- Rated speed: 2000 r/min
- Operating speed range: 600–3000 r/min, maintaining high volumetric efficiency at low speeds
- Volumetric efficiency: ≥ 92%; mechanical efficiency: ≥ 90%
Structure & Material
- Pump housing: High‑strength die‑cast aluminum alloy, lightweight with excellent heat dissipation
- Gears: Precisely ground alloy steel for superior wear resistance and fatigue performance
- Internal design: Floating axial clearance compensation, radial pressure balance, DU self‑lubricating bearings for stable long‑term efficiency, low noise and long service life
3. Operating Principle
One input shaft drives two sets of independently meshing gears, forming two separate hydraulic oil chambers:
1. As driving gears rotate, disengaged tooth spaces create vacuum to draw hydraulic oil through the common suction port
2. Oil is conveyed to high‑pressure chambers by gear rotation and pressurized by meshing teeth, delivering high‑pressure oil via two independent discharge ports
3. Suitable for either dual‑circuit equal‑pressure separate supply or combined supply for one high‑pressure main circuit and one low‑pressure auxiliary circuit
4. Mounting & Port Configurations (Model Suffixes)
1. Mounting flange: Type A diamond flange (industry‑standard SAE dimensions)
2. Port connection: L‑thread connection / flange connection
3. Shaft extension: P flat key / H rectangular spline / X involute spline / SAE spline
4. Rotation direction: R clockwise (default, omitted) / L counter‑clockwise
Complete Model Example: CBT‑F420/F416‑AFP‑R
Meaning: Front pump 20 mL/r, rear pump 16 mL/r, diamond flange, flange ports, flat key shaft, clockwise rotation
5. Typical Applications
Widely used in construction machinery and general hydraulic systems:
- Loaders, forklifts, excavators, road rollers, cranes
- Agricultural machinery, sanitation vehicles, mining equipment, small hydraulic power stations
- Hydraulic systems requiring dual independent hydraulic power sources
