Patent ID: 9566967
Date: 2017-02-14
CPC Classifications: B60T,F16D,F16H,Y10T

Claim:
1. An electric parking brake of a motor vehicle, the electric parking brake comprising: a spindle being displaceable in an axial direction of said spindle; a spindle nut rotatably mounted on said spindle; a support device supporting said spindle nut, said support device having limited resilient flexibility, said support device having at least first and second spring elements being disposed in series with one another in a force transmission chain and being configured to be placed under stress during a transmission of force, and said first spring element having a lower stiffness than said second spring element; said first spring element being configured to be placed under stress under action of a first support force over a first spring travel; a first mechanical engagement device preventing a spring travel beyond said first spring travel and an absorption of force by said first spring element over and above said first support force; said second spring element being formed by a spring module having a second spring; a second mechanical engagement device prestressing said second spring with a second support force for placing said second spring under further stress only when said second support force has been exceeded; a travel sensor indirectly or directly detecting a displacement; a gearing unit including a gearing housing, a driven first shaft and a driving second shaft disposed in said gearing housing, said shafts each having a stationary axis of rotation, a first gearwheel attached to said first shaft and a second gearwheel attached to said second shaft, a third gearwheel through which said first gearwheel and said second gearwheel engage one another, said gearing housing having a displaceable bearing point or at least two spatially offset bearing points, between said first shaft and said second shaft, for said third gearwheel; and an electric motor driving said spindle nut through said gearing unit.