POWER WRENCH WI TH SWIVELLING GEAR CASING

摘要

A power wrench including a housing (10), a rotation motor (12), a reduction gearing (15,16) connecting the motor (12) to an output shaft (13), and a separate gearing casing (17) which is rotatively and detachably mounted on the housing (10) and supporting the output shaft (13), wherein the reduction gearing (15,16) is divided into a first gearing stage (15) located in the housing (10) and a second gearing stage (16) located in the separate gearing casing (17). The first gearing stage (15) and the second gearing stage (16) are interconnected via an intermediate spindle (22), and the motor (12) is connected to the first gearing stage (15) via a hollow drive a drive shaft (25) surrounding the intermediate spindle (22) and an angle gear (24), and a torque sensing means (31-33) is associated with the first gearing stage (15) in the form of strain gauges (33) mounted on an elastically deformable sleeve (31,32) connecting a ring gear (28) of the first gearing stage (15) to the housing (10).