Patent ID: 6981478

Claim:
Adjusting device for electrically adjusting the relative position of the angle of rotation of a camshaft ( 15 , 15 ′) in relation to a crankshaft of an internal-combustion engine, comprising an adjusting gear mechanism, which is formed as a triple-shaft gear mechanism and which has a crankshaft-fixed driving part, a camshaft-fixed driven part, and an adjusting shaft ( 13 , 13 ′, 13 ″) connected in a torsion-proof manner to an adjusting motor shaft ( 32 , 32 ′, 32 ″) of an electric adjusting motor ( 3 to 3 ′″″), wherein the adjusting motor ( 3 to 3 ′″″) is formed as a brushless DC motor with a housing-fixed stator ( 35 ) and a permanent magnet rotor ( 34 to 34 ″″), the adjusting gear mechanism includes one of a double eccentric gear mechanism ( 2 , 2 ′, 2 ″) and a double planetary gear mechanism ( 74 ), which exhibit a speed reduction of up to about 1:250 and low friction, and the adjusting motors ( 3 to 3 ′″″) includes highly inductive permanent magnet rotors ( 34 to 34 ″″).