Patent ID: 7694748

Claim:
A rock breaking machine comprising: a body; an impact device inside the body for generating impact pulses in a tool that is connectable to the rock breaking machine; bearing members for supporting the tool onto the body of the rock breaking machine; a lubricating system for lubricating the bearing members, the lubricating system comprising at least one lubricant channel, and at least one lubricating device for feeding lubricant along the lubricant channel to the bearing members of the tool; the lubricating device comprising at least one lubricant container and a transfer device for feeding lubricant, the lubricant container being arranged inside the body of the rock breaking machine and being enclosed therein, and wherein the volume of the lubricant container is divided into a pressure space and a lubricant space by a dividing member, which is arranged to affect the volumes of the pressure space and lubricant space; the pressure space is connected to a pressure medium channel, which allows pressurization of the pressure space by feeding pressure medium therein; lubricant is storable in the lubricant space; the pressure of the pressure medium acting in the pressure space is arranged to pressurize the lubricant in the lubricant space by means of the dividing member; and the lubricant space is connected to a transfer device, which is arranged to control the feed of lubricant from the lubricant space into the lubricant channel, and wherein the transfer device is arranged to feed lubricant at the moment the impact device stops generating impact pulses; the transfer device comprises a feed element, which is arranged to receive a predetermined lubricant portion from the lubricant container and is arranged to feed the predetermined lubricant portion into the lubricant channel; the transfer device further comprises a control valve for controlling the operation of the feed element and including a first control position and a second control position, in which both control positions the flow of lubricant through the control valve is allowed, said control valve being moved between the first and second control positions by the pressure of the feed space and lubricant space; and when the control valve is in the first control position it controls the loading of the predetermined lubricant portion into the feed element and when it is in the second control position it controls feeding of the predetermined lubricant portion into the lubricant channel.