A shaft is supported by two bearings A and B as shown in Figure 4. The...
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A shaft is supported by two bearings A and B as shown in Figure 4. The shaft is subjected to radial loads and axial loads at C. The axial loads may act in either direction. // ✓ HOUSING C B Figure 4: Shaft supported by two bearings SHAFT (a) Make a neat sketch, showing modifications to the shaft and housing, to provide appropriate constraint for the bearings. (b) Verify your modifications by sketching load paths for the following cases: (i) Radial force acting at C (ii) Axial force on shaft, acting from left to right, at C (iii) Axial force on shaft, acting from right to left, at C (c) The shaft is subjected to relatively high temperatures, which cause it to expand faster than the housing. Is this bearing arrangement suitable? What features make it suitable or unsuitable? Bearings A and B are separated by 100mm (between centre lines). A proposed modification to the shaft results in the load application point C being 25 mm from B's centre line. The applied loads are radial force PR = 16kN and axial force P₁ = 2kN. (d) Calculate the bearing reaction forces and thus indicate the radial and axial forces exerted on bearings A and B. (e) The shaft is expected to run for 6 months at a speed of 1200 rpm. The desired reliability is 93%. Using tables from the NSK bearing catalogue, specify bearings for A and B. You may assume an initial shaft diameter of 30mm, but may adjust this as required. A shaft is supported by two bearings A and B as shown in Figure 4. The shaft is subjected to radial loads and axial loads at C. The axial loads may act in either direction. // ✓ HOUSING C B Figure 4: Shaft supported by two bearings SHAFT (a) Make a neat sketch, showing modifications to the shaft and housing, to provide appropriate constraint for the bearings. (b) Verify your modifications by sketching load paths for the following cases: (i) Radial force acting at C (ii) Axial force on shaft, acting from left to right, at C (iii) Axial force on shaft, acting from right to left, at C (c) The shaft is subjected to relatively high temperatures, which cause it to expand faster than the housing. Is this bearing arrangement suitable? What features make it suitable or unsuitable? Bearings A and B are separated by 100mm (between centre lines). A proposed modification to the shaft results in the load application point C being 25 mm from B's centre line. The applied loads are radial force PR = 16kN and axial force P₁ = 2kN. (d) Calculate the bearing reaction forces and thus indicate the radial and axial forces exerted on bearings A and B. (e) The shaft is expected to run for 6 months at a speed of 1200 rpm. The desired reliability is 93%. Using tables from the NSK bearing catalogue, specify bearings for A and B. You may assume an initial shaft diameter of 30mm, but may adjust this as required.
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a Modifications to the shaft and housing to provide appropriate constraint for the bearings To ensure proper constraint of the shaft in the bearings the shaft must be constrained in both radial and ax... View the full answer
Related Book For
Income Tax Fundamentals 2013
ISBN: 9781285586618
31st Edition
Authors: Gerald E. Whittenburg, Martha Altus Buller, Steven L Gill
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