Crank arm for crank shaft of reciprocating internal combustion engine, has reinforcing rib running parallel to plane, which is spanned through bearing axis and connecting rod axis, where reinforcing rib cuts connecting rod axis

摘要

The arm (4) has a reinforcing rib (5) formed on a side (S2) of the arm and running parallel to a plane (E), which is spanned through a bearing axis (A1) and a connecting rod axis (A2). The reinforcing rib cuts the connecting rod axis, and the side of the arm faces away from another side of the arm. The reinforcing rib extends from a peripheral edge (10) of the arm to a region in which a main bearing pin (2) connectable with the arm. A cross section of the reinforcing rib is formed in square shape. A transverse rib (6) is provided at the reinforcing rib and runs transverse to the plane.