High-stability speed reducer gear

The utility model belongs to the technical field of speed reducer gears, and particularly relates to a high-stability speed reducer gear which comprises a gear body, a concave-convex groove used for positioning connection is formed in an inner ring of the gear body, the gear body is connected with a main shaft in a positioning mode through the concave-convex groove, and an annular protruding block used for limiting the gear body is arranged at the position of the main shaft. The annular groove is in an annular shape and is provided with the first oil holes which are evenly distributed, a loop is formed at the gear teeth of the gear through the first oil holes, the second oil holes and the rectangular groove, lubricating oil can be evenly distributed at the gear teeth better, oil films of the gear teeth of the gear are more stable, and therefore abrasion of the gear is reduced. Through the arrangement of the adjusting block, the adjusting block is driven to slide through the internal thread of the first nut, s