(57) A free piston engine having a hydraulic powertransmis- sion mechanism. The engine
includes at least one free piston (11a, 11b, 11c, 11d) adapted to reciprocate linearly,
a rotary piston (33a) rotatably mounted on the crank pin of the crankshaft (31) to
rotate about the crank pin and a hydraulic power transmission system (34a, 34b, 34c,
34d, 35). One end face of the or each free piston is exposed to pressure of combustion
gas or compressed gas, whereas the other end face of the same is exposed to hydraulic
pressure. The rotary piston (33a) has the contour of epitrochoidal curve as seen in
the cross-sectional plane. Working hydraulic medium is filled in a space (35) of the
hydraulic system as defined between the other end face of the free piston and the
rotary piston so as to convert linear reciprocable movement of the free piston (11a,
11b, 11c, 11d) to rotational movement of the crankshaft (31).
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