The straight line (14) of the path passes through the center O of the output shaft and interconnects the top dead center TDC and the bottom dead center BDC of the path.

Each piston (72) is displaceable along the radial axis between a Top Dead Center (TDC) and a Bottom Dead Center (BDC), the piston (72) being biased into the BDC.

The hot steam pushes the piston (12) towards the bottom dead center (BDC).

The straight line (14) of the path passes through the center O of the output shaft and interconnects the top dead center TDC and the bottom dead center BDC of the path.

bottom dead centre of a piston

Cylinders of an internal combustion engine are provided with an exhaust port that is opened when the piston approaches bottom dead center.

The ECU (50) controls the timing so that the air intake valve (25) is closed at timing before BDC (timing at which the piston is at the bottom dead center).

When the piston arrive at the lower dead point, it stays there for a while due to the cooperation between a lower dead point stopping wheel and a lower dead point stopping channel.

As each cylinder rotates to top-dead-center, an opposite cylinder rotates to bottom-dead-center.

The piston (2) oscillates in the cylinder (1) between a top dead centre (OT1) and a bottom dead centre (UT1).

The respective pistons (10) oscillate in a number of cylinders (11) between a top dead centre (OT) and a bottom dead centre (UT).

At any time, both pistons (56, 60) are moving either towards top dead center or towards bottom dead center.

The piston (14) is moved between a bottom dead center position and a top dead center position during a compression stroke.

The piston stroke is the distance between its high dead point and its low dead center.

A toggle joint drive mechanism simply formed, applicable to a bicycle, and capable of eliminating the top dead center and bottom dead center of a crank.