Rock drilling machine and use thereof for hindering occurrence and spreading of cavitation bubbles

Rock drilling machine (10) comprising a piston that is arranged to move back and forth in a chamber (12a, 12b) when the rock drilling machine (10) is in use, a cavitation-sensitive component (14), and an oil channel that is arranged to extend between the chamber (12a, 12b) and said cavitation-sensitive component (14), wherein said oil channel comprises a series of restrictions (18) and spaces (20) for restricting oil flow through said oil channel during decreasing pressure in the chamber (12a, 12b) to hinder the spreading of cavitation bubbles through said oil channel and to isolate the cavitation-sensitive component from cavitation damage without components having movable parts, said series of restrictions and spaces including at least one space for collecting oil flowing through said oil channel, said at least one space being disposed between two restrictions having decreased cross sectional areas.