4. The figure below shows a countershaft with helical gear (B), bevel gear (D), and two supporting bearings (A and C). Loads acting on the bevel gear are known. Forces on the helical gears can be determined. Shaft dimensions are known. Bearing A takes both thrust and radial loads, while bearing C takes only radial loads. The shaft rotates at 1800 rpm and the bearings are to have a life of 10000 hours. a. Find the forces at the bearings A and C. b. Select suitable bearings (60 series deep groove ball bearings) for this shaft. 450 mm y 400 mm 350 mm Forces act at 225-mm rad. Fz = 0.4 Fy Fy Fx = 0.3 Fy Fy = 1.6 kN Fz = 4.8 kN Fx = 1.2 kN Forces act at 175-mm rad.
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The forces on the helical gear (B) and bevel gear (D) are given, and we need to resolve these forces into their radial and axial components to understand how they affect the bearings. Given forces: - F (acting on B) = 4.8 kN (radial) - F (acting on D) = 1.6 kN Show more…
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The shaft shown in the figure is driven by a gear at the right keyway, drives a fan at the left keyway, and is supported by two deep-groove ball bearings. The shaft is made from AISI 1020 cold-drawn steel. At steady speed, the gear transmits a radial load of 230 lbf and a tangential load of 633 lbf at a pitch diameter of 8 inches. (a) Determine fatigue factors of safety at any potentially critical locations using the DE-Gerber failure criterion. (b) Check that all deflections satisfy the suggested minimums for bearings and gears.
Adi S.
A = 415 mm, B = 0.85A mm, C = 0.75B mm, D = 1.75A mm, E = 1.95A mm, F = 3.95 kN, G = 1.95F kN, N = 1.85 rpm PROBLEM: You are a design engineer at Best Gear company. You will design a shaft that carries two gears and rotates at N rpm, as shown in the figure. The shaft has been supported at a point with appropriate bearings. Given: A = 415 mm B = 0.85A mm C = 0.75B mm D = 1.75A mm E = 1.95A mm F = 3.95 kN G = 1.95F kN N = 1.85 rpm Calculate and draw the overall layout of the shaft with related material and dimensions, considering infinite life and deflections. Take a factor of safety: Minimum. Calculate and select appropriate bearings for the shaft that you have designed. Please select/assume/find other necessary parameters or information which are not given in the questions. Please solve the homework and write it in your own handwriting. Submit it on the website as one PDF file.
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