The invention relates to an assembly (1) comprising a first component (2) with an internal toothing (4) and a second component (3) with an external toothing (6), wherein the two components (2, 3) can be connected to one another by a press fit, which is formed between the internal and the external toothing (4, 6), and wherein the internal and the external toothing (4, 6) each comprise a plurality of teeth (5, 7). The teeth (5) of the internal toothing (4) of the first component (2) and/or the teeth (7) of the external toothing (6) of the second component (3) comprise recesses (13, 15) along the tooth flanks (12, 14).

A clutch for a lift fan comprising at least one output shaft lug key positioned in a keyway of at least two output clutch plates and extending axially from one to the other of the two output clutch plates. The output shaft lug key couples the rotation of the output clutch plates to the rotation an output shaft and allows axial movement of the two output clutch plates relative the output shaft lug key. The output shaft has an outer radial surface and an oppositely disposed inner radial surface, and the inner surface of the output shaft lug key extends radially to the seat of the keyway.

A clutch for a lift fan comprises at least one output shaft lug key positioned in a keyway of at least two output clutch plates and extending axially from one to the other of the two output clutch plates. The output shaft lug key couples the rotation of the output clutch plates to the rotation an output shaft and allows axial movement of the two output clutch plates relative the output shaft lug key. The width of an inner surface of the output shaft lug key varies along the axial length as a function of the proximity to a home axial position of each of the output clutch plates when in the disengaged position.