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US 6,981,478 B2Granted
Electrically driven camshaft adjuster
AssigneeINA-Schaeffler KG
InventorsJens Schäfer, Martin Steigerwald, Jon Heywood
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AssigneeINA-Schaeffler KG
InventorsJens Schäfer, Martin Steigerwald, Jon Heywood
Estimating the term…
A device for electrically adjusting the relative rotation of two shafts, particularly a camshaft (15) in relation to a crankshaft of an internal combustion engine is provided. The adjusting device includes an adjusting gear system which is embodied as a triple-shaft gear mechanism and is provided with a crankshaft-fixed input part, a camshaft-fixed output part, and an adjusting shaft (13) that is connected in a torsion-proof manner to an electric adjusting motor shaft (32) of an electric adjusting motor (3). The adjusting motor (3) is configured as a brushless DC motor having a housing-fixed stator (35) and a permanent magnet rotor (34). A high degree of adjustment accuracy and adjustment speed are provided with minimal space requirements and low power consumption. This is achieved through the use of a double eccentric gear mechanism (2) and a double planetary gear mechanism, which are provided with a speed reduction of up to about 1:250 and low friction, as an adjusting gear system while using a highly inductive permanent magnet rotor for the adjusting motor (3).
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″″).
Dependencies are inferred from the claim text.