Pressure accumulator

A pressure accumulator for supporting the pressure supply of at least one consumer of an internal combustion engine, the pressure accumulator comprising:

• a housing having a housing cavity having a wall;
• a piston axially displaceable in the housing cavity between a first final position and a second final position and provided with a pressure surface which together with the wall of the housing cavity delimits at least partially a reservoir connectable to the consumer in a fluid-conveying manner;
• an energy store which cooperates with the piston, the piston being displaceable against the force of the energy store from the first final position into the second final position in that the reservoir is acted on by pressure using a pressure medium;
• and
• a lock for locking the piston in the second final position,
• the lock including a locking tube connected to the piston and supported within the housing in an axially shiftable manner, the locking tube being lockable at an end of the housing facing away from the reservoir with the aid of a locking pin.