A device contains two bearings is to operate at 300 rev/min, 8 hours per day, 5 days per week for 5 years with a reliability of 0.99. The design load is 2024 N and an application factor of 1.2 is appropriate. Find the catalog rating C10

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A 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.

Q 2. A journal bearing has a shaft diameter of 75.00 mm with a unilateral tolerance of −0.02 mm. The bushing bore has a diameter of 75.10 mm with a unilateral tolerance of 0.06 mm. The bushing is 36 mm long and supports a load of 2 kN. The journal speed is 700 rev/min. For the minimum clearance assembly find the minimum film thickness, the heat loss rate, and the maximum lubricant pressure for SAE 30, SAE 40 and SAE 50 lubricants operating at an average film temperature of 60 °C.

A 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.

A device contains two bearings is to operate at 300 rev/min, 8 hours per day, 5 days per week for 5 years with a reliability of 0.99. The design load is (2006) N and an application factor of 1.2 is appropriate. Find the catalog rating C10            a)For ball bearings         b) For roller bearings  The Weibull parameters are x0=0.02 ,(θ-x0)=4.439 and b=1.483 Use SI units. Take the relations as C10=afFD[xD/x0+(θ-x0)(1-RD)1/b]1/a and xD=LDηD60/LR  Where the subscripts D: desired R: rating f: factor

A ball bearing is subjected to a radial load of 2000 Nat 880 rpm for 40% of the time and to a radial load of 1000 Nat 1760 rpm for the remainder of the time. Expected life is to be 10 years at 6 hours per day. Find the minimum value of the basic rating load C that the bearing must have. Loads are steady. (it is assumed that the bearing has but one row of balls. A working year will be taken as 250 days.)     Ans. C = 15,160 N

2) A shaft is designed with two 6305 bearings. At bearing 1, the radial load is 20 lb, and at Bearing 2, the radial load is 40 lb. What is the expected life of EACH bearing assuming a reliability of 97%? What is the reliability for BOTH bearings together?