The wheel c is fixed if the numbers of teeth on a b c

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Unformatted text preview: h is rigidly connected to the driven shaft. Internal gear B which has 32 teeth is fixed. If the driving shaft runs at 60 r.p.m. clockwise, determine the speed of the driven shaft. What is the direction of rotation of driven shaft with reference to driving shaft? [Ans. 1980 r.p.m. clockwise] Chapter 13 : Gear Trains 14. 15. l 477 Fig. 13.42 Fig. 13.43 A shaft Y is driven by a co-axial shaft X by means of an epicyclic gear train, as shown in Fig. 13.43. The wheel A is keyed to X and E to Y . The wheels B and D are compound and carried on an arm F which can turn freely on the common axes of X and Y . The wheel C is fixed. If the numbers of teeth on A , B , C, D and E are respectively 20, 64, 80, 30 and 50 and the shaft X makes 600 r.p.m., determine the speed in r.p.m. and sense of rotation of the shaft Y . [Ans. 30 r.p.m. in the same sense as shaft X ] An epicyclic bevel gear train, as shown in Fig. 13.44, has fixed gear B meshing with pinion C. The gear E on the driven shaft meshes with the pinion D. The pinions C and D are keyed to a shaft, which revolves in bearings on the arm A . The arm A is keyed to the driving shaft. The number of teeth are : T B = 75, T C = 20, T D = 18, and T E = 70. Find the speed of the driven shaft, if 1. the driving shaft makes 1000 r.p.m., and 2. the gear B turns in the same sense as the driving shaft at 400 r.p.m., the driving shaft still making 1000 r.p.m. [Ans. 421.4 r.p.m. in the same direction as driving shaft] 16. The epicyclic gear train is shown in Fig. 13.45. The wheel D is held stationary by the shaft A and the arm B is rotated at 200 r.p.m. The wheels E (20 teeth) and F (40 teeth) are fixed together and rotate freely on the pin carried by the arm. The wheel G (30 teeth) is rigidly attached to the shaft C. Find the speed of shaft C stating the direction of rotation to that of B. If the gearing transmits 7.5 kW, what will be the torque required to hold the shaft A stationary, neglecting all friction losses? [Ans. 466.7 r.p.m. in opposite directi...
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