Patent ID: 8015955

Claim:
A variable stroke characteristic engine in which a piston ( 11 ) and a crankshaft ( 30 ) are linked to a control shaft ( 65 ) via a variable stroke link mechanism (LV), and the variable stroke link mechanism (LV) is operated by an actuator (AC) that drives the control shaft ( 65 ) to thus make the stroke travel of the piston ( 11 ) variable, characterized in that at least part of a housing (HU) of the actuator (AC) is formed as part of an engine main body ( 1 ), and said part of the engine main body ( 1 ) forming at least part of the housing (HU) of the actuator (AC) is a bearing member ( 54 ) that is fixed to the engine main body ( 1 ) and rotatably supports the crankshaft ( 30 ).