Servo drive, especially for adjusting valve, has auxiliary gear wheel directly engaging adjustment spindle thread and driven by it, so that adjustment spindle is protected against twisting

摘要

The drive has a housing containing a drive motor that drives an adjustment spindle (6) via a gearbox containing at least one worm and worm wheel, so that the spindle is coupled to an adjustment element and the drive has an auxiliary gear wheel for detecting the displacement of the adjustment element. The auxiliary gear wheel (4) engages the thread (3) of the adjustment spindle directly and is driven by it, whereby the adjustment spindle is protected against twisting.