High-rigidity and high-precision spindle structure of spiral bevel gear grinding machine

The invention discloses a high-rigidity and high-precision spindle structure of a spiral bevel gear grinding machine. A spindle flange (3) is in interference fit and location with a grinding wheel spindle (1) by adopting a cylindrical surface and is fastened on the grinding wheel spindle (1) by eight M8 bolts. A grinding wheel transitional plate component (4) is interference fit and location with the grinding wheel spindle (1) by adopting a cone surface and is fastened on the spindle flange (3). The grinding wheel transitional plate component (4) is mounted on the grinding wheel spindle (1) through a fastening screw (6) and twelve M8 bolts. The invention is the high-rigidity and high-precision spindle structure of a spiral bevel gear grinding machine with enough connection intensity and a high-rigidity and high-location precision grinding head when grinding, thus improving the rigidity of the grinding wheel spindle, making the machining accuracy more stable and improving the overall performance of a machine tool.