Hydrostatic Power Unit To Start An Internal Combustion Engine

A hydrostatic power unit, comprising:

• a variable displacement machine with a continuously variable displacement volume, wherein the variable displacement machine is operable as a pump and a motor and is in a drive connection with an internal combustion engine, wherein the power unit operated as a pump sucks hydraulic fluid via a suction side from a tank and delivers into a delivery line that leads to at least one consumer, and wherein the power unit operated as a motor is a hydraulic starter to start the internal combustion engine, wherein hydraulic fluid from a hydraulic accumulator is supplied to the suction side of the power unit operated as a motor, and
• wherein the power unit includes a spring device configured such that when the internal combustion engine is shut off, a displacement volume control device that controls the displacement volume of the power unit is actuated into a position with a maximum displacement volume, such that when the suction side of the power unit receives hydraulic fluid from the hydraulic accumulator, the internal combustion engine is started by the power unit operating as a motor without a need for an immediately preceding separate adjustment of the displacement volume control device of the power unit.