(57) The disclosure relates to a rotary piston, a piston engine comprising the rotary
piston, and an engine device comprising the piston engine. The rotary piston comprises
a piston body having a triangular vertical cross-section, mutually engaged large and
small planetary gears fixed at the middle of the piston body, and a crankshaft running
through the small planetary gear. The three angles of the triangular cross-section
extend outwards to form protruded ends. The two sides of each protruded end form a
compression groove and a combustion groove, respectively. The piston engine of the
present disclosure comprises a shell, a crankshaft in the shell and two sets of rotary
pistons, wherein the crankshaft has two ends and the two sets of rotary pistons are
positioned symmetrically at the two ends of the crankshaft and separated by a holder
positioned between the two sets of pistons.
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