US 6,981,478 B2
Electrically driven camshaft adjuster
Jens Schäfer, Herzogenaurach (Germany); Martin Steigerwald, Erlangen (Germany); and Jon Heywood, Pettstadt (Germany)
Assigned to INA-Schaeffler KG, Herzogenaurach (Germany)
Filed on Apr. 12, 2005, as Appl. No. 11/104,135.
Application 11/104135 is a continuation of application No. PCT/EP03/11286, filed on Oct. 11, 2003.
Claims priority of application No. 102 48 355 (DE), filed on Oct. 17, 2002.
Prior Publication US 2005/0199201 A1, Sep. 15, 2005
Int. Cl. F01L 1/34 (2006.01)
U.S. Cl. 123—90.17 26 Claims
OG exemplary drawing
 
1. 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″″).