Research Article

Calculation of Unloading Area of Internal Gear Pump and Optimization

Table 1

Internal gear pump parameters.

Name of the parameterParameterValue

Number of teeth13/19
Modulus (mm)m3
Center distance (mm)e9.278
Pressure angle (°)α20
Coefficient of rack cutter tip height1.25
External gear profile shift coefficient0.432
Internal gear profile shift coefficient0.55
Unloading groove boundary distance (mm)2.035
The first solution root radius (mm)32.0
The second solution root radius (mm)33.80