| 摘要 |
An electrical adjusting device for changing an angle of rotation of a camshaft ( 3 ) relative to a crankshaft of an internal-combustion engine is provided. The device includes an adjusting gear unit ( 1 ), which is formed as a triple-shaft gear unit, including an input part ( 4 ) that is fixed to the crankshaft, an output part ( 5 ) that is fixed to the camshaft, and an adjusting shaft ( 6 ), which is connected in a torsion-proof manner to an electric adjusting motor ( 2 ) having a permanent magnet rotor and a stator ( 8 ) fixed to the housing. A stationary gear ratio ( 10 ), the value of which defines the adjusting gear unit ( 1 ) as a positive or negative gear unit and deter-mines whether a direction of adjustment of the camshaft ( 3, 65, 69 ) is into an advanced or retarded base position, is located between the input part ( 4 ) and the output part ( 5 ) when the adjusting shaft is at rest. Due to the configuration of the adjusting gear unit ( 1 ), stationary gear ratios are provided, through which an advanced and a retarded base position of the camshaft ( 3, 65, 69 ) can be reached exclusively through braking of the adjusting shaft ( 6 ) when the adjusting gear unit ( 1 ) is rotating, and the braking of the adjusting shaft ( 6 ) is carried out through short-circuit braking of the adjusting motor ( 2 ).
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