Free piston engine has engine piston driven by staged hydraulic piston, section of which with lesser diameter is arranged in work cylinder and section with greater diameter in compression cylinder

摘要

The free piston engine has an engine piston (6) driven by a staged hydraulic piston (8), the section of which with the lesser diameter is arranged in a work cylinder (14) and the section with the greater diameter in a compression cylinder (18). The compression stroke is activated with pressure medium from an accumulator (30) via a start valve (32). Pressure medium can be sucked into the work cylinder from a low pressure accumulator (24). During the expansion stroke, the pressure medium in one of the cylinders is used for charging a pressure medium accumulator. The pressure medium accumulator is of the high pressure type (30), connectable to both the work cylinder and the compression cylinder.