The
crankcase [1] comprises two crankshafts [4] and [5] arranged parallel
to one another, one with a long-stroke crank [4], the other with
a short-stroke crank [5]; the two cylinders [2] and [3], provided
respectively with pistons [6] and [8] and connecting rods [7] and
[9], are respectively arranged above one of the two crankshafts
[4] and [5].
The crank of the short-stroke crankshaft [5]
coacts with the connecting rod [9] of the piston [8] in the smaller
cylinder [3] and the crank of long-stroke crankshaft [4] coacts
with the connecting rod [7] of the piston [6] in the larger cylinder
[2].
The two cylinders [2] and [3] are connected
one by one, from one row to the other, through a recess in the cylinder
head [10], so as to form a pair of cylinders [2] and [3] in communication
with each other.
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