US Patent 9175745 Handheld power tool having a planetary gear

In a handheld power tool having a planetary gear, drivable by a motor, for driving a drive shaft in a first or second predefined direction of rotation, the planetary gear being situated in a gear housing and having at least one planetary stage to which an annulus gear situated in the gear housing is assigned, in the area between the annulus gear and the gear housing, at least one sensor element is situated which is designed to enable a detection of a torque which acts in the first or the second direction of rotation and is transferable to the annulus gear via the drive shaft during the operation of the handheld power tool.