US 11,901,852 B2
Procedure for detecting a transmission backlash in a power tool, in particular a hand-held power tool, and power tool
Hardy Schmid, Stuttgart (DE); Axel Kuhnle, Freiberg (DE); Hagen Philipp Keinath, Stuttgart (DE); Matthias Tauber, Duernau (DE); and Sebastian Maier, Bietigheim-Bissingen (DE)
Assigned to Robert Bosch GmbH, Stuttgart (DE)
Filed by Robert Bosch GmbH, Stuttgart (DE)
Filed on Sep. 29, 2021, as Appl. No. 17/488,615.
Claims priority of application No. 10 2020 212 427.2 (DE), filed on Oct. 1, 2020.
Prior Publication US 2022/0105617 A1, Apr. 7, 2022
Int. Cl. B25D 16/00 (2006.01); H02P 6/16 (2016.01)
CPC H02P 6/16 (2013.01) [B25D 2211/068 (2013.01); B25D 2216/0084 (2013.01); B25D 2250/095 (2013.01); B25D 2250/221 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method for detecting a transmission backlash in a hand-held power tool, the hand-held power tool comprising a drive motor that has a drive shaft, a tool spindle, and a transmission that, in respect of drive, connects the drive shaft to the tool spindle, the method comprising:
automatically rotating the drive shaft of the drive motor in one of a clockwise and a counter clock-wise direction upon at least one of switching on the hand-held power tool and following changing of a battery pack at least until a value of a first variable, representing a drag torque, is at least approximately constant;
monitoring a second variable which is associated with the rotation of the drive shaft of the drive motor during the rotation in the one of the clockwise and the counter clock-wise direction; and
determining a value of a third variable, representing a transmission backlash, based upon a change in the second variable during the rotation in the one of the clockwise and the counter clock-wise direction.