Ex: The second shaft on a parallel-shaft 25-hp foundry crane speed reducer contains a helical gear with a pitch diameter of 8.08 in. Helical gears transmit components of force in the tangential, radial, and axial directions. The components of the gear force transmitted to the second shaft are shown in Fig. (8) at point A. The bearing reactions at C and D, assuming simple- supports, are also shown. A ball bearing is to be selected for location C to accept the thrust, and a cylindrical roller bearing is to be utilized at location D. The life goal of the speed reducer is 10 kh, with a reliability factor for the ensemble of all four bearings (both shafts) to equal 1 (90%% reliability) with light to moderate impact. (a) Select the roller bearing for location D. (6) Select the ball bearing (angular contact) for location C, assuming the inner ring rotates. Fig.(8)

Ex: The second shaft on a parallel-shaft 25-hp foundry crane speed reducer contains a helical gear with a pitch diameter of 8.08 in. Helical gears transmit components of force in the tangential, radial, and axial directions. The components of the gear force transmitted to the second shaft are shown in Fig. (8) at point A. The bearing reactions at C and D, assuming simple- supports, are also shown. A ball bearing is to be selected for location C to accept the thrust, and a cylindrical roller bearing is to be utilized at location D. The life goal of the speed reducer is 10 kh, with a reliability factor for the ensemble of all four bearings (both shafts) to equal 1 (90%% reliability) with light to moderate impact. (a) Select the roller bearing for location D. (6) Select the ball bearing (angular contact) for location C, assuming the inner ring rotates. Fig.(8)

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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(a) (b) 200 mm (c) A 600 mm B 200 mm с Fig. 3 Fig. 3 shows the layout of a shaft that rotates 500 rev/min and is supported by bearings at O and C. The shaft is carrying two gears at point A and B, in which the pitch diameter of Gears A and B are 500 mm and 250 mm, respectively. The force, PA applied at Gear A is 3.5 kN. The rotating shaft is made from AISI 1030 steel, and the factor of safety is 3. PB PA= 3.5 kN List down 2 assumptions needed in designing the shaft in Fig. 3. Design the minimum allowable diameter for the shaft at its critical location. The bearings at points O and C are required to have a desired life of 25kh at a speed of 500 rev/min. Based on these conditions, select the appropriate bearings for this
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Calculate the angle of twist at point A. A for the following diagrammed problem. There is a 1600 lb-in torque T applied at A. Shaft AB is 12 in. long, and shaft CD is 8 in. long. Gear B has 8 in. diameter, and Gear C has 5 in. diameter. Both shafts have diameter 1 in. Assume that there is no slip between the gears, and that all components are made of steel with shear modulus G-29 × 10° psi. TA = 1600 lb in A 12 in B C 8 in D
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