Eccentric shaft for an internal combustion engine

An eccentric shaft for a rotary combustion engine having at least one working unit, each working unit comprising a peripheral housing describing an epitrochoidal orbit and a triangular piston mounted on said eccentric shaft and having three tips which contact said epitrochoidal orbit to form three working spaces, said eccentric shaft comprising:

• at least two shaft parts including a front shaft part and a rear shaft part, each shaft part having at least one axial end provided with a mating profile which can mate with the mating profile of another said shaft part at at least one joint site;
• a tie rod received through said shaft parts to positively connect said shaft parts at said at least one joint site, said tie rod and said shaft parts forming a space which can be filled with lubricating oil inside said shaft parts;
• and
• at least one main bearing for journaling said eccentric shaft,
• wherein each said joint site is located under a respective said main bearing and is not sealed, whereby lubricating oil can leak from said space inside said shaft parts to the respective said main bearing through the respective said joint site.