Linear motion module of planetary roller shaft pair

Abstract

This utility model relates to a linear transmission mechanism, disclosing a linear motion module for a planetary roller shaft pair, including a nut, a shaft, a cage, and planetary rollers. The cage is fitted onto the shaft, and multiple planetary rollers are mounted on the cage and connected to the shaft. The shaft, carrying the planetary rollers, is threadedly connected to the nut. When the nut rotates, the planetary rollers rotate on their own axis on the cage and revolve around the shaft. The shaft has a plurality of annular concave teeth, and the planetary rollers also have a plurality of annular convex teeth. The annular convex teeth are adapted to the annular concave teeth and rotate around them. The annular convex teeth are also adapted to the internal thread of the nut. In the machining of this motion module, no threads need to be machined on the planetary rollers and the shaft. Its structure is relatively simple, so its machining steps and processes are simpler than those of traditional reverse planetary roller screws, making it easier to machine.

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