Turbomachine Front Structure With Upstream Reduction Gear Layout

The patent relocates the reduction gear from the traditional axial position within the primary channel to a radial position in the inter-vein compartment. This dimensional change allows the reduction gear to be positioned outside the primary flow path, eliminating geometric constraints on the primary channel while maintaining the large fan diameter needed for high dilution rate. The force transmission path is reconfigured to pass through the inter-vein compartment structure rather than through the primary channel geometry.

The reduction gear is extracted from the primary channel and relocated to the inter-vein compartment. This separation removes the constraint that the reduction gear imposed on the primary channel's internal diameter. The primary channel can now be sized optimally for aerodynamic performance without having to accommodate the reduction gear, reducing overall turbomachine mass while maintaining the speed reduction function.

The inter-vein compartment structure serves as an intermediary force transmission path. Instead of the primary channel structure having to transmit forces from the reduction gear, the forces are transmitted through the inter-vein compartment's structural elements (such as the diaphragm and support structures) that are already present for other functional purposes. This eliminates the need for additional structural reinforcements in the primary channel, reducing overall structural mass.