tailieunhanh - shi20396 chương 13

From Ex. 13-1, a 16-tooth spur pinion meshes with a 40-tooth gear, mG = 40/16 = . Equations (13-10) through (13-13) apply. | Chapter 13 13-1 dP 17 8 in N2 1120 dG dP in G N3 P 544 Ng PdG 8 35 teeth Ans. C 2 in Ans. 13-2 nG 1600 15 60 400 rev min Ans. p n m 3n mm Ans. C 3 15 60 2 mm Ans. 13-3 NG 20 56 teeth Ans. dG NGm 56 4 224 mm Ans. dP NPm 20 4 80 mm Ans. C 224 80 2 152 mm Ans. 13-4 Mesh a 1 P 1 3 in Ans. b P 3 in Ans. c b a in Ans. p n P n 3 in Ans. t p 2 2 in Ans. Pinion Base-Circle d1 N1 P 21 3 7 in d1b 7 cos 20 in Ans. Gear Base-Circle d2 N2 P 28 3 in d2b cos 20 in Ans. Base pitch pb pc cos 0 n 3 cos 20 in Ans. Contact Ratio mc Lab pb Ans. See the next page for a drawing of the gears and the arc lengths. 334 Solutions Manual Instructor s Solution Manual to Accompany Mechanical Engineering Design 13-5 a Ao in Ans. b y tan-1 14 32 Ans. r tan-1 32 14 Ans. c dp 14 6 in dG 32 6 in Ans. d From Table 13-3 in and 10 P 10 6 a F in Ans. 13-6 a Pn n 5 in pt pn cos cos30 in px pt tan tan30 in Chapter 13 335 b pnb pn cos n cos 20 in Ans. c Pt Pn cos 5 cos 30 teeth in fa tan-1 tan n cos tan-1 tan20 cos30 Ans. d Table 13-4 a 1 5 in Ans. b 5 in Ans. 17 dp ---------- in Ans. P 5 cos 30 34 dG ---------- in Ans. G 5 cos 30 13-7 G 20 n Pn 10 teeth in a pn n 10 in Ans. ------- in cos 20 pn Pt ------7 cos ty Ans. pt Px 7 tan ty ------ in tan 20 Ans. b Pt Pn cos 10 cos 20 teeth in _1 tan fa tan Ans. cos 20 c a 1 10 in Ans. b 10 in Ans. 19 dP ------------ in Ans. P 10 cos 20 57 dG ------------ in Ans. G 10 cos 20