关键词: 行星滚柱丝杠, 直齿轮, 螺纹槽, 有限元分析, 螺距, 接触应力

Abstract: Planetary roller screw pair has an involute spur gear with threaded grooves, which meshes with the internal gear fixed to the nut. Due to the influence of thread grooves, the meshing contact stress on the tooth surface was different from that of a complete spur gear. Taking the spur gear as the research object, modeling was conducted using professional gear design software KissSoft and 3D software. The distribution and variation of contact stress on the tooth surface of gears with threaded grooves were analyzed using finite element simulation software. The research shows that the existence of the thread groove increases the contact stress on the tooth surface of the gear mesh. With the reduction of the thread pitch of the thread groove, the contact stress on the tooth surface shows an upward trend, and the excessive thread pitch will weaken the flexural strength of the gear.

Key words: planetary roller screw, spur gear, threaded groove, finite element analysis ( FEA), pitch, contact stress