Internal combustion engine with variable compression ratio and variable engine displacement
View Patent ↗A hypocycloidal internal combustion engine containing at least one alternative displacement piston connected through a connecting rod to a crankshaft, which is connected to an epicyclic gear train. In this gear train, the planet gear carrier is connected to the output shaft, and the ring gear can be rotated (in a controlled manner) in relation to the engine block. The present invention allows the control of the compression ratio and engine displacement of the engine by adjusting the angular position of the ring gear, which can be done continuously and instantaneously, even with the engine in operation.
1. A variable compression ratio internal combustion engine comprising:
a cylinder, a piston, a connecting rod, a ring gear, a planet gear, an endless screw and a crankshaft;
wherein said ring gear comprises a plurality of internal teeth and a plurality of external teeth;
the piston, connected by the connecting rod to the planet gear, which, in turn, is connected to the crankshaft, the planet gear is configured to engage the plurality of internal teeth of the ring gear and to travel around an inside of the ring gear, the plurality of external teeth of the ring gear is configured to engage the endless screw; wherein the endless screw is configured to rotate the ring gear in a controlled manner through a plurality of angular positions, β;
said piston is configured to travel inside said cylinder between a top dead center position and a bottom dead center position as the crankshaft rotates; and
said endless screw alters the angular position of the ring gear, which, in turn, alters an angular position of the planet gear when the piston is at said top dead center position and at said bottom dead center position as follows:
to allow the piston reach its maximum top dead center position, the planet gear can be at β=0 when the crankshaft is at β=0 and to allow the piston to reach its minimum bottom dead center position, the planet gear can be at β=180 when the crankshaft is at β=180, and
to restrict the piston from reaching its maximum top dead center position, the planet gear can be positioned at β>0 when the crankshaft is at β=0 and to restrict the piston from reaching its minimum bottom dead center position, the ring gear can be positioned at β>180 when the crankshaft is at β=180;
wherein this variable positioning of the ring gear via the endless screw allows for the compression ratio to be continuously varied in response to engine operating conditions.