Hydrostatic Power Unit To Start An Internal Combustion Engine

摘要

A variable displacement hydrostatic power unit (7) is connected with an internal combustion engine (2). The power unit (7) operates as a pump to deliver hydraulic fluid to at least one consumer (V) and operates as a motor as a hydraulic starter for the internal combustion engine (2). Hydraulic fluid from a hydraulic accumulator (25) is supplied to the power unit (7) operated as a motor. The power unit (7) includes a spring device (55) which, when the internal combustion engine (2) is shut off, actuates a displacement volume control device (50) into a position with the maximum displacement volume. When the power unit (7) is actuated with hydraulic fluid from the hydraulic accumulator (25), the internal combustion engine (7) is immediately started by the power unit (7) without the need for an immediately preceding adjustment of the displacement volume control device (50) of the power unit (7).

主权项

1. 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.