Patent ID: 9139110
Filing Date: 2015-09-22
Classification: B60N,F16H,Y10T

Abstract:
1. A spindle drive for longitudinally adjusting a motor vehicle seat comprising an adjustment rail being longitudinally adjustable relative to a body mounted rail and an adjusting mechanism including a spindle comprising an external thread, a driving worm comprising a first external toothing and connected to a driving device and a spindle nut comprising a second external toothing and an internal toothing, the second external toothing of the spindle nut engaging with the first external toothing of the driving worm and the internal toothing of the spindle nut engaging with the external thread of the spindle, wherein the spindle nut is formed by a hybrid spindle nut comprising a functional part arranged in the force flux between the driving worm and the spindle and at least one strengthening part deflecting crash forces from the adjustment rail into the spindle, the functional part and the at least one strengthening part being connected such that the functional part and the at least one strengthening part are rotated together when driving the spindle nut by the driving worm, wherein the adjusting mechanism comprises a housing having at least one bearing opening forming a bearing for the spindle nut, and wherein the at least one strengthening part comprises a cylindrical projection axially protruding out of the functional part and being received within the at least one bearing opening of the housing, and an internal toothing, wherein the tooth flanks thereof are spaced apart from the tooth flanks of the external thread of the spindle such that during normal operation only the internal toothing of the functional part engages with the external thread of the spindle.