Tham khảo tài liệu 'gear geometry and applied theory episode 2 part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Nomenclature 403 parabolic function of transmission errors that is able to absorb the linear functions of transmission errors caused by misalignments. NOMENCLATURE a n a Pk k p p rack profile angle in normal section Fig. rack profile angle in transverse section Fig. helix angle on pitch cylinder k p on cylinder of radius p k p Figs. and ki i p b p lead angle on the pitch cylinder i p on the base cylinder i b and on the cylinder of radius p Figs. and P-1 half of the angular width of the tooth space on the base circle of gear 1 Fig. 9 91 and 92 surface parameter of the screw involute surface Figs. and ộ Ộ1 and Ộ2 92 E p 12 n H l m12 mc N n pn angle of gear rotation Figs. and half of the angular tooth thickness on pitch circle of gear 2 shortest axes distance Fig. normal component of contact force Fig. lead Fig. axial dimension of helical gear Fig. b gear ratio gear contact ratio surface normal surface unit normal circular pitch measured perpendicular to the direction of skew teeth of the rack Fig. c pt Pn and Pt p H 2n q circular pitch in the cross section Fig. c diametral pitches that correspond to pn and pt screw parameter orientation angle of straight contact lines on rack tooth surface Fig. rb ro rpi s St u Wt X 12 v 12 Z 12 Xf vf Zf radius of base cylinder Fig. radius of operating pitch cylinder axode radius of pitch cylinder i Figs. and rack displacement Fig. tooth thickness on the pitch circle in the cross section surface parameter of a screw involute surface space width measured on the pitch circle in cross section components of contact force Figs. and 15 Modified Involute Gears INTRODUCTION Involute gears spur and helical ones are widely used in reducers planetary gear trains transmissions and many other industrial applications. The level of sophistication in the design
