US Patent 10920857 Twin countershaft transmission with spline

A transmission includes a countershaft, a splitter section having an input shaft and a clutch that couples the input shaft to the countershaft, a main transmission assembly having a main shaft and a main transmission clutch, the main shaft coupled to the countershaft via the main transmission clutch, a range gear assembly having a an annulus gear, a sun gear, a planet gear, and center shaft that provides output from the transmission, and a spline joint that couples the main shaft to the center shaft and in operation transfers torque through and reduces eccentric loads between the main shaft and the center shaft that occur due to axial misalignment.