Above is a drawing from a patent filed by Daimler-Benz designer, Reinhold Freitag in 1943.
It shows the front of the DB 628 engine which was distinctive in that the first stage supercharger was mounted between the propeller reduction gear and the propeller.
(3) indicates the crankshaft with (5) the crankshaft pinion which drives (6) the reduction gear. To the left of (5) is a cushion drive (14) to protect the large gear (15) from shock. Gear (15) drives gear (16) which is directly connected to the planet cage (18) - this is the step-up gearing for the supercharger impeller (9).
Air is fed to the impeller via an annular duct (25) and the volume and direction of the air is controlled by a ring of variable inlet guide vanes (28).
The propeller blades have their pitch set by the mechanism (40) in the bell chamber under the influence of control rods (41) and (42).
The DB 628 was a derivation of the DB 605 version.