Work spindle for high bending load and torque measurement by torsion

摘要

A work spindle (12) for high bending load consists of a hollow shaft (44), mounted in bearings (14, 16/18) at an axial distance apart and largely resistant to bending and torsion, and a torsionally elastic central shaft (48). The hollow shaft (44) and the central shaft (48) are connected to one another at the output side end in such a way as to be locked in terms of rotation. The drive moment is introduced via the free end (40) of the central shaft (48). The free end (40) projects out of the hollow shaft (44). Arranged at the unconnected ends of the shafts (44, 48) are means for producing impulse signals related to the angle of rotation, the torsion-dependent phase displacement of which can be used as a measure of the transmitted torque. This design ensures high bending resistance on the one hand and adequate torsional elasticity between the two measuring locations on the other hand, as a result of which the transmitted torque can be continuously recorded with conventional measuring devices.