Question

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I Determine the degree of freedom of the mechanism. B) 2 A planetary gear train, in which the numbers of teeth of gears are: Z=3), Z=15, Z=30, n=10001pm, n=70rpm, Determine: -0,0 In the condition of above question, If the module of gear 1 and 2 is given: mlm2 4 mm determine parameters of genr 1 following the diameter of addendum circle, diameter of dedendum circle,diameter of reference circle,diameter of base circle and Center distance of gear 1.2 ha -1 025)

Answer 1

Page 1

Soins- B 5 A 0 6 n = 8 (All the fixed Total number of links in the mechanism, links are treated as single link o) lower pairs (sliding contact) Higher pairs c point or fine contact) 1 - 2 2-3 3-4 4-5 1-4 5-6 5-7 6-7 7-8 6-1 8-1 No. of lower pairs, l= 9, No. of higher pairs, h=2.

Page 2

By Kutzbach criterion, number of degrees of freedom of the above planar mechanism is given by, n = No. of links F-3(n-1) - 24-h es No. of Lower pairs 3 (8-1) -2x9 – 2 ha No. of higher pairs 3 x 7 2x9 - 2 21 - 18-2 t1 1 ( single degree of freedom).

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