A RECIPROCATING PISTON MECHANISM

摘要

A reciprocating piston mechanism (1) comprises a crankcase (2) and a crankshaft (3) having at least a crankpin (5). The crankshaft (3) is supported by the crankcase (2) and rotatable with respect thereto about a crankshaft axis (6). Furthermore, the mechanism (1) comprises at least a connecting rod (10), a piston (12) and a crank member (7) which is rotatably mounted on the crankpin (5) and comprises at least a bearing portion (8) which is eccentrically disposed with respect to the crankpin (5). The mechanism (1) is also provided with a driving means for rotating the crank member (7) at a rotation frequency with respect to the crankcase (2) which is substantially half of that of the crankshaft (3). The driving means is adapted such that it drives the crank member (7) in the same rotational direction as that of the crankshaft (3).