Pressure accumulator and percussion device

A pressure accumulator for connection to a hydraulic fluid-driven percussion device, wherein the percussion device comprises at least one impact piston that is arranged to carry out a reciprocating motion caused by pressure from hydraulic fluid, whereby said pressure accumulator is arranged in communication with a hydraulic fluid space of the impact piston, said pressure accumulator comprising:

• a space that extends at least partly around said impact piston when said pressure accumulator is mounted on said percussion device, and
• a partition configured to divide the space into two separate pressure chambers so that the pressure chambers are located in an axial direction of the impact piston in relation to each other when said pressure accumulator is mounted on said percussion device, whereby a first of said two separate pressure chambers is intended to be filled with a compressible medium, and a second pressure chamber is in fluid communication with the hydraulic fluid space of the impact piston.