Calculating the basic data

Calculating the constant torque – M_K2 Note: If P_K1 is unknown → P_K1 = P_M

M_K2	Nm	Operating torque on LSS
P_K1	kW	Operating power at HSS
n₂	min^-1	Output speed (LSS)
P_M	kW	Nominal motor power
η		η = f (i; gear unit type) The efficiency of the gear unit is mainly determined by the gearing friction, bearing friction, and churning losses. For the calculation, the following guide values apply for splash and pressure lubrication: X2F.. = 0.976 X3F.. = 0.964 X4F.. = 0.953 X2K.. = 0.978 X3K.. = 0.970 X4K.. = 0.957

Equivalent torque with load spectrum and constant speed n₂ for bearing service life calculation

M_K2	Nm	Operating torque on LSS
		The following figure shows a load example: = time share of the load I, II,...n = load cases Gearing, shaft, and key safety factors must be checked with the greatest torque of the load collective. If single load situations exceed the nominal torque of the gear unit, contact SEW‑EURODRIVE.

Equivalent torque with load spectrum and constant speed n₂ for bearing service life calculation

M_K2

Operating torque on LSS

The following figure shows a load example:

= time share of the load

I, II,...n = load cases

Gearing, shaft, and key safety factors must be checked with the greatest torque of the load collective. If single load situations exceed the nominal torque of the gear unit, contact SEW‑EURODRIVE.

Calculating the gear unit ratio – i

i		Gear unit ratio
n1	min^-1	Input speed (HSS)
n₂	min^-1	Output speed (LSS)