By taking a planetary roller screw as the research object

the influence of contact angle and helix angle on axial elastic deformation are considered

and the axial elastic deformation of screw pair are calculated with finite element method.It is concluded that the results of finite element calculation and the theoretical calculation are approximate

and the maximal error is 4.85%.The effects of contact angle and helix angle on axial elastic deformation are analyzed under different axial load.Results show that the Hertz contact deformation is the main deformation of axial elastic deformation.Besides

the variation trend of elastic deformation is the same as that of the von Miese stress

the axial elastic deformation will be decreased duo to the increase of contact angle and helix angle

therefore

moderate contact angle and helix angle are favorable to promote transmission accuracy of planetary roller screw.