The pump driving gear has a first gear axis, and the pump driven gear has a second gear axis.

The inventive transmission allows that several reduction gears are mounted on one transmission arbor.

The first gear axis is parallel to but laterally offset from the pump axis on a first side of the pump axis.

Said double gear set is further rotationally received by a transmission arbor that consists of a mechanically resistant material, for example a ceramic material.

The second gear axis is parallel to but laterally offset from the pump axis on a second side of the pump axis.

A planetary gear (64) meshes with the sun gear (62) for revolving about the central axis (40) while pivoting about a revolving planetary gear axis.

A geared architecture includes at least one gear driven by the turbine section for rotating about a gear axis that is transverse to the fan axis.

At least one of the transmission shafts (9, 11) is mounted as a transmission arbor in the housing in a non-rotational manner.

The pump driving gear has a first gear axis, and the pump driven gear has a second gear axis.

The pinion gear (20) is rotatable about a first axis (B).

The driven wheel of the first fixed axis gear set is connected to the driving wheel of the second fixed axis gear set to form the countershaft.

Respective ring gears of the first and the second planetary gear set are connected to the driving wheel of the first fixed axis gear set and the driven wheel of the second fixed axis gear set, respectively.

Each gearing member is constrained at its axis by a semilunar bearings placed between the gearing member and the inner surface of the housing.

One or more drive gear members are each rotatable mounted on the base and each rotatable about a corresponding drive gear member axis, meshing with the central gear wheel.

A power-transmission device has an input shaft, an output shaft, a gear mechanism and a motor.