Clamp for measuring verticality and coaxiality of gear assembly

The utility model belongs to the technical field of measurement, and discloses a fixture for measuring verticality and coaxiality of a gear assembly, which comprises a flat plate, a thimble frame, a thimble, a support rod, a vertical gauge stand, a horizontal gauge stand and a dial indicator. A vertical supporting rod is arranged in the center of the flat plate, a sliding groove is formed in the front end of the flat plate, the two ejector pin frames are arranged on the two sides of the sliding groove, the ejector pin frames move or are fixed relative to the sliding groove through knurled nuts and screws, the two ejector pin frames are each provided with an ejector pin in the opposite direction, and the two ejector pins oppositely form a rotating shaft for fixing a gear. The vertical gauge stand and the horizontal gauge stand are detachably installed on the supporting rod, and when the dial gauge is installed on the supporting rod through the vertical gauge stand, the measuring end of the dial gauge makes con