Rotation unit, rock drilling unit and method for rock drilling

摘要

The invention relates to a rotation unit, rock drilling unit and method for rock drilling. The rotation unit comprises a main shaft (17) that is rotated around its longitudinal axis by means of a rotating motor (16). The main shaft is supported to a body (23) of the rotation device (7) slidingly in the axial direction. This slide property is utilized when connection threads of drilling equipment (9) and drilling components (10) comprised by it are connected.