Patent ID: 11901852
Assignee: ROBERT BOSCH GMBH
Field: Machine tools (Mechanical engineering)
Classification: CPC H  B | IPC B  H

Claim 13:
14. 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:
actuating the drive motor 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 a rotation of the drive shaft of the drive motor during the actuation; and
determining a value of a third variable, representing a transmission backlash, based upon a change in the second variable during the actuation,, wherein:
the hand-held power tool has a reduction gear comprising a pinion and a gearwheel: and
determining the value of the second variable and determining the value of the third variable are each performed multiple times in succession for respective circumferential portions of the gearwheel.