Gear grinding clamp for unthreaded hole parts

The utility model discloses a gear grinding fixture for unthreaded hole parts, which comprises a fixture body and a live center, the fixture body is fixedly mounted on a machine tool base of a gear grinding machine, the live center is fixedly mounted on a machine tool tailstock of the gear grinding machine, a first conical surface is arranged on the outer wall of the top of the fixture body, and a second conical surface is arranged on the outer wall of the top of the fixture body. A second conical surface is arranged on the tip head of the live tip, and the taper of the first conical surface is the same as that of the second conical surface. According to the utility model, the first conical surface and the second conical surface are respectively arranged on the clamp body and the live center, so that the clamping of the gear grinding process of unthreaded hole type parts with the inner hole size within a certain range can be met, and the technical problem of poorer universality of a precision hydraulic gear g