Device for variable adjustment of the control times of gas exchange valves of an internal combustion engine

1. Device for variable adjustment of control times of gas exchange valves of an internal combustion engine, comprising

a hydraulic phase adjustment device, a camshaft, a volume accumulator, a first fastening element constructed separately from the camshaft, and a central screw,

the central screw penetrates the phase adjustment device, and

one end of the central screw contacts an axial side surface of the phase adjustment device and a first thread is constructed on the other end,

an interior of the camshaft has a hollow space in which the first fastening element is mounted fixed in position,

a second thread is constructed on the first fastening element, said second thread interacts with the first thread of the central screw such that a rotationally locked connection is established between the device and the camshaft, and

a volume accumulator with a housing is arranged in the hollow space, and one axial end of the housing contacts a contact surface of the first fastening element.

2. Device according to claim 1 , wherein the contact surface has a conical construction in a direction of the housing.

3. Device according to claim 1 , wherein the first fastening element or the central screw has a pressurized medium channel running in an axial direction, wherein said channel opens into the hollow space on a side of the first fastening element turned away from the phase adjustment device.

4. Device according to claim 3 , the pressurized medium channel is constructed as a borehole within the central screw.

5. Device according to claim 3 , wherein the pressurized medium channel is constructed on an outer lateral surface of the first fastening element.

6. Device according to claim 3 , wherein the pressurized medium channel communicates with the volume accumulator.

7. Device according to claim 3 , wherein the pressurized medium channel communicates with a camshaft bearing point.