Patent ID: 7628088

Claim:
A ball screw mechanism, comprising: a spindle nut that has grooves for accommodating balls which run in the grooves to rotatably support the spindle nut on a ball rolling spindle; a driving wheel that is rotationally locked to the spindle nut so that a rotation imparted to the driving wheel also rotates the spindle nut; a bearing for accommodating the spindle nut, the bearing comprising an outer ring configured to be axially fixed to a housing without the need for an additional ring to axially fix the outer ring to the housing, wherein the outer ring comprises an annular ring having an inner circumference that circumscribes the spindle nut so as to extend over less than half of an axial length of the spindle nut; a bearing running surface formed on the inner circumference of said annular ring, and a radial flange adjoining the annular ring, the radial flange being capable of being fixed to the housing wherein, the driving wheel is configured to be driven by a traction mechanism, and the bearing running surface is arranged axially within the driving wheel.