Patent ID: 6190126
Filing Date: 2001-02-20
Classification: F04D

Abstract:
A fan impeller assembly for cooling systems of internal combustion engines, comprising:a cup shaped hub, andadjustable fan blades which are guided rotatably in a peripheral wall of the hub, andan actuating drive operable to adjust the fan blades and situated in the cup-shaped hub, said actuating drive including:an actuating element spring-loaded toward an initial position and acted upon in an opposite direction by a pressure medium,adjusting eccentrics which are situated at a transition between said actuating element and the fan blades and can be acted upon by the actuating element, the actuating element being formed by a concentrically arranged actuating piston which adjoins the cup wall in a sealing manner and is guided by the latter,wherein a piston wall of the actuating piston lies in radial overlap with the fan blades as an actuating ring for receiving actuating stubs of the adjusting eccentrics, andwherein, by a pressure medium acting on the actuating piston, the fan blades can be changed over into a direction of delivery opposite to a direction of delivery in an initial position and, in both of the opposite directions of delivery, are loaded in the directions of the blade position corresponding to the respective direction of delivery.