Tham khảo tài liệu 'manual gearbox design part 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 126 Manual Gearbox Design Figure a-c Graphs for cutter spindle tilt a c o b c l 30 c c 3 where Rm mean cone distance Zp no. of teeth - crown gear fim spiral angle at mean cone distance 16 Maximum whole tooth depth. Figures a b and c are used for the determination of the tilt of the cutter spindle. Tilting becomes necessary for very flat ring gears to avoid interference of the returning teeth. ôk is the maximum outer cone angle of the ring gear that can still be cut. To find the maximum tooth depth admissible enter ỏk2 ô2 pitch cone angle and determine as abscissa the relationship rb h where rb is the cutter designation and h the tooth depth. Oerlikon cycloid spiral bevel gear calculations 127 At the intersection with the corresponding curve of the angle X rb spiral angle X cutter designation results from the cutter and h are found in the same manner. This is carried out in Figures a b and c giving the following tilt angles c o C l 30 and c 3 . If tooth depth h in Figure a is larger than h then tilting of the cutter spindle becomes necessary. The amount of tilting depends on whether h is smaller than h in Figure b c l 30 or Figure c c 3 although if stub teeth are used the next smaller angle of tilt can possibly be used. 17 Tooth depth h hk hf where hk addendum mp hf dedendum 128 Manual Gearbox Design Figure cont. 18 Cutter tilt C sin-1C see calculation 16 J pressure angle - cutter tilt a c using a for cutters En 19 Auxiliary value kb see Figure page 123 20 Auxiliary value _ 2 fc X XCOS p i .ị where kb auxiliary value see calculation 19 Rp reference cone distance Rị inner cone distance Pp spiral .
