Patent ID: 7703426

Claim:
Hydraulic camshaft adjuster for an internal combustion engine comprising: a) a stator, b) a rotor, which has a degree of rotational freedom relative to the stator, c) at least two pressure chambers, which are formed between the stator and rotor and which are separated from each other by a radially oriented vane of the rotor, d) a mechanical spring element, connected between the rotor and the stator, arranged in at least one of the at least two pressure chambers, e) a stop located between the rotor and the stator, which limits a rotational angle of the rotor relative to the stator, before the mechanical spring element moves into a blocking form, and f) a wall of the rotor and/or the stator which defines the pressure chamber has a recess, groove, or bore, with a base thereof on which the mechanical spring element ( 23 ) is supported, and a depth of the recess, groove, or bore or a common depth of two of the recesses, grooves, or bores in the pressure chamber is greater than a minimum height of the mechanical spring element.