Torque breaking tool for sector gear shaft

The utility model discloses a sector gear shaft destroying torque tool which comprises a base, a first clamping piece, a second clamping piece and a driving piece, an arc-shaped inner gear ring is arranged on the base and used for being matched with a sector gear at the lower end of a sector gear shaft to be tested, two first planes parallel to each other are arranged on the side face of the upper end of the sector gear shaft, and two second planes parallel to each other are arranged on the driving piece. The opposite sides of the first clamping piece and the second clamping piece are respectively provided with a second plane, and the inner sides of the upper portions of the first clamping piece and the second clamping piece are provided with bayonets used for being matched with a twisting shear head. The first clamping piece and the second clamping piece can adapt to the sector gear shafts with different sizes, and can ensure that the first clamping piece and the second clamping piece are in surface-to-surfa