HYDRO-MECHANICAL TRANSMISSION ASSEMBLY FOR A MACHINE

A hydro-mechanical transmission assembly includes a hydrostatic pump-motor assembly having a variable displacement hydrostatic pump. The pump has a primary input shaft configured to be operatively driven by a prime mover. The hydrostatic pump-motor assembly also includes a hydraulic motor fluidly coupled to and operatively driven by the hydrostatic pump. The motor has a primary output shaft that is bi-directionally rotatable with change in displacement of the pump. The primary output shaft is coupled to a secondary input shaft of a multi-speed transmission, wherein the multi-speed transmission includes one of: a counter-shaft transmission system, a multi-stage planetary gear set, and a power-shift transmission system that includes a combination of the counter-shaft transmission system and the multi-stage planetary gear set. This way, a secondary output shaft of the multi-speed transmission is configured to operate with discrete speed ratios in relation to the primary output shaft of the hydraulic motor.