TAILIEUCHUNG - Manual Gearbox Design Part 9

Tham khảo tài liệu 'manual gearbox design part 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Crown wheel and pinion designs 111 Table cont. Formula Description no. Formula Result Axial thrust 67 of wheel Pa2 Pa2 334 _ sinỗp pj tana- 22 cos ệr tan ir X cos 5j 2 3 Radial force a Main direction of rotation and hand of spiral are the same . anticlockwise and left-hand respectively Radial force 68 of pinion Radial force 69 of wheel Pri Pa2 Ph 151 P 2 P t Pr2 458 b Direction of rotation clockwise hand of spiral to the left Radial force 68 of pinion Radial force 69 of wheel P 1 P 2 Ph 334 Pr2 p il Pr2 356 Strength of teeth see Table Table Material of pinion and wheel 16 . 5 - case hardened Formula Description no. Formula Result Circumferential speed 73 . X 7Ĩ X n r r s 60000 Static breaking strength bB - 12 000 kg cm2 Profile correction 60 factor xm xm hkt hakm-m 112 Manual Gearbox Design Table coni. Formula Description no. Formula Result Tooth shape y taken from y factor for Figure r page 99 Bending stress 72 bB PM 2478kg according to Lewis formula Breaking safety 74 c _ 0 1 p. ruM s Breaking safety factor empirical for stationary gears use value Sb 3 to 5 depending on life required. 6 Oerlikon cycloid spiral bevel gear calculations Design features Both of the gear pair members . the crown wheel and pinion are obtained by development on two complementary crown gears which leads to a constant tooth depth for the full facewidth and mathematically exact calculations. The longitudinal tooth curve is the result of continuous and synchronized rotary motion of the cutter and the workpiece the curve is part of an epicycloid. The normal module is greatest at the reference point and decreases slightly towards both ends of the tooth because of the coincidence of the instantaneous centre and the radius of curvature centre of the epicycloid. The centre of the tooth bearing is exactly determined by the selection of the reference cone distance. The length of the tooth bearings can be influenced within wide limits .

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