Patent ID: 7987829

Claim:
A camshaft adjusting device for changing an angular relationship between a camshaft and an internal combustion engine crankshaft, comprising: a stator and a rotor housed within and adjustable in a circumferential direction relative to the stator by a pressure medium, the rotor connectable to a camshaft and the stator connectable to the crankshaft; a first cover plate and a second cover plate between which the stator and rotor are housed, the first cover and the second cover fixed to the stator; a spring cover plate spaced axially apart and fixed to the first cover plate; an outer spring retainer positioned between the spring cover plate and the first cover plate, the outer spring retainer fixed to the spring cover plate; and a torsion spring positioned between the spring cover plate and the first cover plate, the torsion spring having an inner spring end connected to the rotor and an outer spring end engaged with the outer spring retainer thereby connecting the outer spring end to the spring cover plate, the torsion spring configured to rotate the rotor relative to the stator such that the torsion spring is rotatably fixed to the rotor; and an inner spring retainer positioned between the spring cover plate and the first cover plate and fixed to the rotor, wherein the inner spring end of the torsion spring engages the inner spring retainer thereby connecting the inner spring end to the rotor, and wherein the outer spring retainer is positioned and fixed at an outwardly radial position on an inner wall of the spring cover plate; and the inner spring retainer is positioned at an inwardly radial position and fixed to the rotor by a radial shoulder that extends through the first cover and fixably engages a retaining cavity in the rotor.