Estimate the life of this bearing with 90% reliability.
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- A bearing is subjected to a radial force of 8kN and a thrust force of 3 kN. Thevalues of X and Y factors are 0.56 and 1.5 respectively. The shaft rotates at 1200RPM. The diameter of the shaft is 75mm and Bearing no. 6315 (C= 112000N) isselected for this application. Estimate the life of this bearing with 90% reliability. Show the given, required, schematic diagram and solution. Also show the formulas being use.A shaft is loaded in bending and torsion such that Ma = 62 N · m, Ta = 48 N · m, Mm = 54 N · m, and Tm = 25 N · m. For the shaft, Su = 700 MPa and Sy = 560 MPa, and a fully corrected endurance limit of Se = 210 MPa is assumed. Let Kf = 2.2 and Kfs = 1.8. With a design factor of 2.0 determine the minimum acceptable diameter of the shaft in mm using the DE-Goodman criterion.A bearing is subjected to a radial force of 8kN and a thrust force of 3 kN. Thevalues of X and Y factors are 0.56 and 1.5 respectively. The shaft rotates at 1200 RPM. The diameter of the shaft is 75mm and Bearing no. 6315 (C= 112000N) is selected for this application. Estimate the life of this bearing with 90% reliability.
- A V-belt drive transmits 20kW from an electric motor running at 1440rpm to the main shaft of a roving machine. The motor and main shaft pulleys have 300 & 600 rpm respectively. The coefficient of friction between belt and pulley is 0.25. The centre distance between the shafts is 1000mm. The top width, thickness, section angle and density of belt and permissible tension on the belt are 22mm, 14mm and 40deg, 0.97gcm-2 and 600N respectively. How many belts are needed? Calculate the length of a belt neededA bearing is subjected to a radial force of 8kN and a thrust force of 3 kN. The values of X and Y factors are 0.56 and 1.5 respectively. The shaft rotates at 1200 RPM. The diameter of the shaft is 75mm and Bearing no. 6315 (C= 112000N) is selected for this application. Estimate the life of this bearing with 90% reliability. Follow the methodologies in solving the problem; Given : Required: Schematic Diagram: Solution:A Solid steel shaft running at 600rpm is supported on bearings 600mm apart. The shaft receives 40kW through a 400mm diameter pulley weighing 400N located 300mm to the right of left bearing by a vertical flat belt drive. The power is transmitted from the shaft through another pulley of diameter 600mm weighing 600N located 200mm to the right of right bearing. The belt drives are at right angles to each other and ratio of belt tensions is 3. Determine the size of the shaft necessary, if the allowable shear stress in the shaft material is 40MPa and the loads are steady.
- Determine the thermal shock resistance for a tool steel with the following properties: tensile strength σ = 2000MPa, thermal conductivity k = 51.9 W/m℃, elastic modulus E = 200 000 MPa, and thermal expansion coefficient α = 12.1 m/m℃.A fix inclined-plane thrust bearing is designed to carry a total normal load of 50kN at optimum capacity with the following specifications: ro = 100mm, ri = 50mm, N = 3600 rpm, l/b = 1, b = 40mm, hi – h0 = 25 μm and SAE 20 oil is used with an inlet temperature of 55℃ (μd = 29 cP). Determine the minimum film thickness assuming that the change in oil is negligible.An industrial fan running at 600 rpm is driven by a 25kW, 960rpm, induction motor using an open belt drive. The pulley is mounted on the motor shaft of 270mm diameter. Center distance between the two shafts is 1.45 meters and coefficient of friction is 0.35. Assume thickness of belt equal to 6.5 mm and an allowable stress of 2.86MPa for belt material. Calculate the following: a) Angle of lap for both pulleys; b) Length of the belt; and c) Width of the belt (disregard standard size).A bushed pin type flexible coupling is used to transmit 10 kW power at 720 rpm. The design torque is 150% of rated torque. The keys have square cross-section. The permissible stresses are: For shaft and key material, τ = 66.67 N/mm2 , σc = 200 N/mm2 ; For pin material, τ = 35 N/mm2 , σt = 133 N/mm2 ; For flange material τ = 16.67 N/mm2 . The permissible bearing pressure for rubber bushes is 1 N/mm2. The number of bushes is 4. Design the bushed pin flexible coupling. Explain Axle, Spindle, Counter shaft and line-shaft with their examples .
- A bushed pin type flexible coupling is used to transmit 10 kW power at 720 rpm. The design torque is 150% of rated torque. The keys have square cross-section. The permissible stresses are: For shaft and key material, τ = 66.67 N/mm2, σc = 200 N/mm2; For pin material, τ = 35 N/mm2, σt = 133 N/mm2; For flange material τ = 16.67 N/mm2. The permissible bearing pressure for rubber bushes is 1 N/mm2. The number of bushes is 4. Design the bushed pin flexible coupling.The disc clutch of an automobile is carried on a 2-inch 6-splined shaft and not to slide under load. The nominal dimensions are as follows: b = 0.25 D; t = 0.075 D and d = 0.85 D. The hub length of 150 % of shaft diameter. Determine the total horsepower transmitted at 3,600 rpm, if the yield strength of the shaft is 1,400 psiA certain application requires a ball bearing with the inner ring rotating, with a design life of LD = 15 kh at a speed of nD = 480 rev/min. The radial load is Fr = 1.4 kN, the axial load Fa = 0.4 kN, and an application factor of af = 1.2 is appropriate. The reliability goal, R = 0.99. a) Determine the multiple of rating life required, xD, and the catalog rating C10FR, where FR is the calculated bearing load in [kN] with which we enter a bearing table. Specify a 02-series angular contact ball bearing from Table 11–2, b) Estimate the reliability (R) and multiple of rating-life (XD) in use.