Work vehicle

A work vehicle comprising a transmission case, installed in a traveling machine body, that includes:

• a main transmission input shaft configured to receive a driving force transmitted from an engine;
• a main transmission output shaft fit on the main transmission input shaft in a relatively rotatable manner,
• wherein the main transmission input shaft is provided with a hydraulic pump unit, a cylinder block, and a hydraulic motor unit, forming a hydraulic mechanical transmission and being arranged in series, wherein the hydraulic motor unit is configured to transmit shifted driving force to the main transmission output shaft, and
• wherein the transmission case includes:
• a planetary gear mechanism configured to combine the driving force from the engine and the shifted driving force to the main transmission output shaft to generate a combined driving force;
• a transmission shaft configured to receive the shifted driving force via the main transmission output shaft and the combined driving force via the planetary gear mechanism;
• a forward traveling low speed clutch configured to connect and disconnect transmission of the driving force from the main transmission output shaft to the transmission shaft;
• and
• a forward traveling high speed clutch configured to connect and disconnect transmission of the driving force from the planetary gear mechanism to the transmission shaft, wherein:
• the transmission case further includes an input counter shaft through which the driving force form the engine is transmitted to the main transmission input shaft,
• the input counter shaft, the main transmission input shaft, the main transmission output shaft, and the transmission shaft are arranged in parallel with each other,
• the input counter shaft is provided with the planetary gear mechanism, and
• the transmission shaft is provided with the forward traveling low speed clutch and the forward traveling high speed clutch.