Abstract: A balance shaft for balancing forces of inertia and/or moments of inertia of a reciprocating-piston internal combustion engine, including: at least one elongate main body; at least one bearing seat disposed on the elongate main body, for the mounting of a radial bearing, wherein in the center point of the bearing seat is provided the rotational axis of the balance shaft. On the elongate main body is provided at least one unbalance portion the center of mass of which lies outside the rotational axis of the balance shaft. On the at least one unbalance portion substantially no material is provided in the region of the rotational axis of the balance shaft. A method for producing such a balance shaft is also provided.

Abstract: An integral workpiece which has a duct located within a region which extends, for example in an annular manner, and formed about an axis of the workpiece. The workpiece has a form-fitting connection by which, when viewed in a cross section extending through the axis, the duct is closed. The form-fitting connection enables, in comparison with known manufacturing methods, particularly simple manufacturing of the workpiece. In particular, no welding or screwing is required for closing the duct.

Abstract: An integral workpiece which has a duct located within a region which extends, for example in an annular manner, and formed about an axis of the workpiece. The workpiece has a form-fitting connection by which, when viewed in a cross section extending through the axis, the duct is closed. The form-fitting connection enables, in comparison with known manufacturing methods, particularly simple manufacturing of the workpiece. In particular, no welding or screwing is required for closing the duct.