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Unformatted text preview: is 600 mm. If one shaft runs at 120 r.p.m. and the other at 360 r.p.m., find the number of teeth on each
wheel, if the module is 8 mm. Also determine the exact distance apart of the shafts.
[Ans. 114, 38 ; 608 mm]
In a reverted gear train, as shown in Fig. 13.32, two shafts A and B are
in the same straight line and are geared together through an intermediate parallel shaft C. The gears connecting the shafts A and C have a
module of 2 mm and those connecting the shafts C and B have a
module of 4.5 mm. The speed of shaft A is to be about but greater than
12 times the speed of shaft B , and the ratio at each reduction is same.
Find suitable number of teeth for gears. The number of teeth of each
gear is to be a minimum but not less than 16. Also find the exact
velocity ratio and the distance of shaft C from A and B .
[Ans. 36, 126, 16, 56 ; 12.25 ; 162 mm]
Fig. 13.32
In an epicyclic gear train, as shown in Fig.13.33, the number of teeth
on wheels A , B and C are 48, 24 and 50 respectively. If the arm rotates at 400 r.p.m., clockwise,
find : 1. Speed of wheel C when A is fixed, and 2. Speed of wheel A when C is fixed.
[Ans. 16 r.p.m. (clockwise) ; 16.67 (anticlockwise)] Fig. 13.33 Fig. 13.34 Chapter 13 : Gear Trains
5. 6. 475 In an epicyclic gear train, as shown in Fig. 13.34, the wheel C is keyed to the shaft B and wheel F is
keyed to shaft A . The wheels D and E rotate together on a pin fixed to the arm G. The number of teeth
on wheels C, D, E and F are 35, 65, 32 and 68 respectively.
If the shaft A rotates at 60 r.p.m. and the shaft B rotates at 28 r.p.m. in the opposite direction, find
the speed and direction of rotation of arm G. [Ans. 90 r.p.m., in the same direction as shaft A ]
An epicyclic gear train, as shown in Fig. 13.35, is composed of a fixed annular wheel A having 150
teeth. The wheel A is meshing with wheel B which drives wheel D through an idle wheel C, D being
concentric with A . The wheels B and C are carried on an arm which revolves clockwise at 100 r.p.m.
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This note was uploaded on 02/13/2014 for the course MIE 301 taught by Professor Celghorn during the Fall '08 term at University of Toronto Toronto.
 Fall '08
 CELGHORN

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