Patent ID: 8312855

Claim:
Mass-balancing device for a reciprocating-piston internal combustion engine, comprising a first balancing shaft and a second balancing shaft that is arranged in the first balancing shaft coaxial to the first balancing shaft and that rotates in an opposite direction, the first balancing shaft has at least one bearing point for a first roller bearing and the second balancing shaft has at least one bearing point for a second roller bearing, the first and second balancing shafts are supported radially by the first and second roller bearings in the reciprocating-piston internal combustion engine, at least one of the bearing points has a hollow cylindrical construction with an outer lateral surface used as a bearing seat or inner raceway for the first roller bearing and with an inner lateral surface used as a bearing seat or outer raceway for the second roller bearing, such that the first roller bearing and the second roller bearing overlap in an axial direction to a large extent or completely.