Patent ID: 7070531

Claim:
A hydromechanical transmission, comprising: a driving source; a planetary gear speed reducer connected to said driving source; a variable displacement hydraulic pump, which is connected to said planetary gear speed reducer, and to which a first part of an output force of said driving source is outputted; an output shaft, which is connected to said planetary gear speed reducer, and to which a second part of the output force of said driving source is outputted; a first variable displacement hydraulic motor which receives pressure oil from said variable displacement hydraulic pump and outputs a driving force to said output shaft; a second variable displacement hydraulic motor which receives pressure oil from said variable displacement hydraulic pump and outputs a driving force to said output shaft; a clutch placed between said second variable displacement hydraulic motor and said output shaft; and a normal clutch and a reverse rotation clutch placed between said planetary gear speed reducer and said first variable displacement hydraulic motor; wherein said variable displacement hydraulic pump comprises a two-way variable displacement pump.