Patent ID: 7914264
Filing Date: 2011-03-29
Classification: F01P,F04D,F16D

Abstract:
1. A controllable drive suitable for use in a coolant pump, comprising: a rotatably mounted shaft; a pump housing with a throat; a coupling bearing located at a radial distance from the shaft; a driven member which is rotationally fixedly mounted on the shaft; a driving member which comprises a coupling housing and which is mounted so as to be rotatable relative to the shaft and to form a coupling region between the driving member and the driven member for holding a viscous fluid, wherein the coupling housing includes a coupling cover and a coupling base body; a fluid reservoir communicating with the coupling region via at least one first flow path and at least one second flow path for the viscous fluid; and an actuation device for controlling at least one of said flow paths, wherein the actuation device is arranged within a fluid chamber whose boundary comprises the coupling cover, the coupling base body, the throat of the pump housing, and the coupling bearing; wherein the actuation device forms a portion of a wall of the fluid chamber; wherein the actuation device is located at a smaller radial distance from the shaft than the coupling bearing; wherein the actuation device comprises an actuator having a magnetic coil and an axially moveable armature which can be acted on by the magnetic coil; wherein the controllable drive is configured such that there is no wall or solid material between the armature and the magnetic coil.