Hub-shaft assembly

An assembly comprising:

• a shaft including an enlarged diameter shaft portion having an outer surface and end portions each having a flat surface;
• two hubs that are separate from the shaft and mounted on the enlarged diameter shaft portion, the two hubs being configured so that outer ends of the two hubs are spaced apart from each other, each hub including an inner surface configured to engage the outer surface of the enlarged diameter shaft portion with a light interference fit and end portions each having a flat surface that lies along a common plane with the flat surface of a respective end portion of the enlarged diameter shaft portion, wherein the two hubs each include an opposite-hand helical gear that is indexed/meshed for load sharing with a mating herringbone pinion;
• and
• a first fastening device positioned within a first opening formed in the engaged outer surface of the shaft and the inner surfaces of the two hubs and extending from respective co-planar flat surfaces at the end portions of the enlarged diameter shaft portion and the two hubs along lengths of the shaft and the two hubs, wherein the first fastening device includes a bolt head and a nut bearing on the end surfaces of the hubs and the enlarged diameter shaft portion.