GEAR2000 Help - Profiles - CYCLOIDAL lobes compressor pump

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Cycloidal lobes compressor pump

Geometric elements of the inner rotor are known CYCLOIDAL curves and the profile is self-built by the data provided in INPUT.

The inner rotor is made of a portion of Epicycloid and a portion of Hypocycloid.

Epicycloid and Hypocycloid generation rolls can have different diameters.

The fundamental features are defined by the value of

Nominal diameter of reference circle (DC₁),  Eccentricity (e)

and internal Rotor lobes number  (N).

External and Internal diameter of internal rotor are calculated from input data.

Envelope generation of 3 lobes INNER ROTOR profile starting from an 4 lobes EXTERNAL ROTOR.

Envelope generation of 3 lobes INNER  ROTOR profile (red) starting from an 2 lobes EXTERNAL ROTOR (purple).

 

 

Calc : Calculation step [DEG] ( suggest =  0.5 ).

Dist : Minimum distance between points calculated with Calc value (suggested 0.2 mm).

J_{MAX  :}  Max coupling backlash; this value allows to define the Offset value applicable to profile:

Off = ( J_MAX - ( Si.min - Se.max ) /2 ) * K * (-1)

            Si.min = Lover deviation of external diam. (Internal Rotor)

            Se.max = Upper deviation of internal diam. (External Rotor)

            K = Backlash coefficient management,  is a user parameter that aims to ensure the
            presence of a minimum clearance even when Iy is made with the minimum deviation
            value (must be > 1 and is suggested = 1.1).

DC₁ : Nominal diameter of reference circle reduced by the mean tolerance value (Si.min+Se.max)/2.

P_R : Ratio between rollers diameters ( P_R=RollR₁ / RollR₂  must be > 1 )

GEAR2000 Help