Spindle drive
AssigneeStabilus GmbH
InventorsTimo Frieb-Preis, Michael Kleinmann
Life of this patent
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Abstract
A spindle drive for a movable component includes a threaded spindle, which can be driven in rotation about a rotational axis by a reversible drive. A spindle nut is mounted nonrotatably on the spindle. By means of the spindle nut, a transmission element connected to the movable component can be driven axially with respect to the spindle axis. The spindle nut can be connected to and disconnected from the transmission element by a connecting device. A nut position sensor detects the position of the spindle nut and a component sensor detects the axial position of the transmission element. If it is concluded that there is plausibility between the signals of the nut position sensor and the component sensor, the spindle nut can be connected to the transmission element by the connecting device.
Claims14
A spindle drive for a movable component, comprising:
- a threaded spindle;
- a reversible drive connected to said threaded spindle and configured to rotate said threaded spindle about a spindle axis of rotation;
- a spindle nut mounted non-rotatably on said threaded spindle such that said spindle nut moves axially relative to said spindle axis when said threaded spindle is rotated;
- a transmission element connectable to the movable component;
- a connecting device configured to move between a connected position, in which said spindle nut is connected to said transmission element so that said transmission element moves axially with said spindle nut, and a disconnected position, in which said spindle nut is disconnected from said transmission element;
- a nut position sensor configured to generate a first signal corresponding to a current axial position of said spindle nut and a component sensor configured to generate a second signal corresponding to a current position of said transmission element;
- and
- a control unit receiving said first and second signals and determining whether there is plausibility between the first and second signals, said connecting device being actuatable to move to said connected position only if it is determined that there is plausibility between said first and second signals,
- wherein said spindle nut has a radial driver arm and said transmission element has a claw, said radial driver arm being pivoted between a connecting position and a disconnecting position around said spindle axis when said connecting device is moved between said connected and disconnected positions, where a free end of said driver arm engages in said claw of said transmission element in the connecting position and said driver arm is disengaged from said claw of said transmission element in the disconnecting position.
Dependencies are inferred from the claim text.