Patent ID: 9138879
Filing Date: 2015-09-22
Classification: B25D,E21B

Abstract:
1. A method for lubricating a rotation mechanism of a drill shank in a rock drilling machine, the method comprising: directing to the rotation mechanism of the drill shank at least part of a flow of a pressure fluid of a hydraulic circuit of a device of the rock drilling machine that performs at least one function, for the purpose of lubricating the rotation mechanism of the drill shank, and circulating the pressure fluid used in lubricating the rotation mechanism of the drill shank back to a hydraulic system of the rock drilling machine, and then to the hydraulic circuit of the device of the rock drilling machine performing at least one function, wherein the pressure fluid used for lubricating the rotation mechanism of the drill shank is returned back to a pressure medium container that is in the hydraulic system of the rock drilling machine, and wherein the device of the rock drilling machine performing at least one function is a rotating device of the rock drilling machine.