A rock drill comprising at least: a frame; a percussion member for generating impact pulses; an axial shank provided on the front side of the percussion member in the direction of the impact and comprising an impact surface for receiving said impact pulses; and further comprising an axial sleeve provided within the frame and comprising a first pressure surface facing towards the shank provided in a first pressure space defined between the axial sleeve and the surrounding frame and a second pressure surface facing away from the shank provided in a second pressure space also defined between the axial sleeve and the surrounding frame, wherein the first pressure space is provided in an axial direction on the side of the shank in relation to the axial sleeve and the second pressure space is provided in an axial direction on the side of the axial sleeve opposite to that of the shank, and wherein pressure medium fed to said first pressure space acts on the first pressure surface for moving the axial sleeve with respect to the frame in one axial direction away from the shank and wherein pressure medium fed to said second pressure space acts on the second pressure surface for moving axial sleeve with respect to the frame in the opposite axial direction of the impact, and a first channel provided in the axial sleeve, which first channel provides a connection between the first pressure space and the second pressure space in at least one position of the axial sleeve in the frame; and a second pressure channel connected to the second pressure space, which second pressure channel is connected to an external pressure source; wherein a pressure accumulator is connected to the first pressure space and flow of the pressure medium outwards from the first pressure space is throttled. a frame; a percussion member for generating impact pulses; an axial shank provided on the front side of the percussion member in the direction of the impact and comprising an impact surface for receiving said impact pulses; and further comprising an axial sleeve provided within the frame and comprising a first pressure surface facing towards the shank provided in a first pressure space defined between the axial sleeve and the surrounding frame and a second pressure surface facing away from the shank provided in a second pressure space also defined between the axial sleeve and the surrounding frame, wherein the first pressure space is provided in an axial direction on the side of the shank in relation to the axial sleeve and the second pressure space is provided in an axial direction on the side of the axial sleeve opposite to that of the shank, and wherein pressure medium fed to said first pressure space acts on the first pressure surface for moving the axial sleeve with respect to the frame in one axial direction away from the shank and wherein pressure medium fed to said second pressure space acts on the second pressure surface for moving axial sleeve with respect to the frame in the opposite axial direction of the impact, and a first channel provided in the axial sleeve, which first channel provides a connection between the first pressure space and the second pressure space in at least one position of the axial sleeve in the frame; and a second pressure channel connected to the second pressure space, which second pressure channel is connected to an external pressure source; wherein a pressure accumulator is connected to the first pressure space and flow of the pressure medium outwards from the first pressure space is throttled.