Patent ID: 7375606
Filing Date: 2008-05-20
Classification: F02N,H01H

Abstract:
1. An electromagnetic contactor for an electric staffer motor, said electromagnetic contactor comprising: connection terminals configured to connect to the battery and to the electric motor, a movable core, a main stationary core, an axial air gap provided between the movable core and the main stationary core, a tubular coil to produce a magnetic current in the air gap provided between the movable core and the main stationary core during excitation, a magnetic circuit provided with a case constructed with magnetic frame attached to the stationary core, an insulating cap enclosing the contacts of the electric power circuit and having connection terminals intended for connection to the battery and the electric motor, said case being composed of a metal bell-shaped housing, an internal ferrule made of magnetic material surrounding the coil, and a washer acting as an additional stationary core through which the movable core passes, and arranged opposite the main stationary core, wherein the metal housing of the case comprises an annular rib extending continuously opposite the cylindrical periphery of the main stationary core, said annular rib having an internal diameter respectively greater than that of the ferrule and smaller than that of the housing, so as to ensure the locking of the different parts of the case, and wherein an outer periphery of the main stationary core is in close contact with the inside periphery of an innermost internal diameter of the annular rib.