Repeat design problem Prob. 12–18 using the nominal bushing bore B as one decision variable and the radial clearance c as the other. Again, Trumpler’s criteria to be used.
12–18 Design a central annular-groove pressure-fed bearing with an l′/d ratio of 0.5, using SAE grade 20 oil, the lubricant supplied at 30 psig. The exterior oil cooler can maintain the sump temperature at 120°F for heat dissipation rates up to 1500 Btu/h. The load to be carried is 900 lbf at 3000 rev/min. The groove width is
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Shigley's Mechanical Engineering Design (McGraw-Hill Series in Mechanical Engineering)
- A propeller shaft rotating at constant speed is subjected to variable loads.Ball bearing supporting the shaft are subject to variable radial loads as follows;16KN for 40 percent of the time,2KN for 10 percent of the time,4KN for 20percent of the time and no load for the remaining time of the cycle.The total life expected for bearing is 3×10^6 revolution at a liability of 94 percent.select the bearing by calculating; a)Net dynamic load for the bearing b)load rating of the bearing from the manufacturers cataloguearrow_forward15.)A full journal bearing has a journal diameter of 4.000in. with a unilateral tolerance of -0.004in. The bushing bore has a diameter of 4.004in and unilateral tolerance of +0.004in. the bearing is 3in long. The journal load is 3000 lbf and it runs at a speed of 400 rpm. What is the load per projected bearing area 9P) in psi? Choose answer below 75 100 125 250 16.)For the bearing in problem #15, if the lubricant average viscosity is 9 ureym, what is the Sommerfield number (assuming minimum clearance) Choose answer below Between 0.6 and 0.7 Between 0.5 and 0.6 Between 0.3 and 0.4 Between 0.2 and 0.3arrow_forwardSelect a doubler row deep groove ball bearing for a radial load of 5000 N and an axial load of 6000 N, operating at a speed of 1600 r.p.m. for an average life of 8 years at 20 hours per week. Assume W /C0 = 0.50arrow_forward
- b) Design a single row deep groove ball bearing with basic dynamic load rating of 33 KN to be used in a turbine to carry a radial load of 1584 N. The expected life of the bearing is 5591 hours at 529 rpm. Take k=3 for all types of ball bearings. Take the value of the shock load factor as 1.8. The radial and axial load factors are 1.3 and 1.6 respectively and the rotational factor is 1. Calculate: i) Expected life of bearings in millions of revolutions ii) Design equivalent dynamic load in N iii) Basic equivalent dynamic load in N iv) Axial load acting on the bearing in Narrow_forwardA power screw assembly with single acme threads is to be used to raise a load of 3000 lbf at an axial displacement rate of 2.5 in/s. The steel screw has a nominal diameter of 2 inches and its threads are oil lubricated. The screw is paired with a bronze nut; axial support is provided by a thrust collar with a bronze thrust washer that is secured to the frame. The mean radius of the collar is 1.1 inches. A gear motor is utilized to drive the power screw assembly. a. What is the minimum power requirement for the motor? b. Do you expect the power screw assembly to be self-locking? c. Calculate the efficiency of the screw assembly.arrow_forwardPressure vessel having 20in diameter is under a repeated load with a maximum pressure of 350psi per cycle. The vessel is made of AISIC1095. Determine its thickness.arrow_forward
- Answer this ASAP plz A double row angular contact ball bearing is used in the engine compressor to accept radial loads of 6000 N and axial loads of 3000 N, operating at 2400 rpm for an average life of 7 years at 8 hours per day. Assume that the shock load is light. Select the appropriate bearing number. Note: the equivalent dynamic load is the dynamic equivalent radial load times the service factor.arrow_forwardA connecting rod for an I.C. engine running at 1800 r.p.m. and developing a maximum pressure of 3.15 MPa. The diameter of the piston is 100 mm; mass of the reciprocating parts per cylinder 2.25 kg; length of connecting rod 380 mm; stroke of piston 190 mm and compression ratio 6:1. Take a factor of safety of 6 for the design. Take length to diameter ratio for big end bearing as 1.3 and small end bearing as 2 and the corresponding bearing pressures as 10 MPa and 15 MPa. The density of material of the rod may be taken as 8000 kg/m³ and the allowable stress in the bolts as 60 MPa and in cap as 80 MPa. The rod is to be of I-section for which you can choose your own proportions. Calculate the dimension of I- section of the connecting rod.arrow_forwardA single row deep groove ball bearing is operating at a speed of 2000rpm acted upon by a radial load of 10kn and thrust load of 8kn. The bearing is subjected to light shock load and outer ring is rotating. Determine the life rating of the bearingarrow_forward
- Select an angular contact ball bearing to carry a radial load of (336+01)lbat a shaft speed of 1800 rpm for 5500 hours. Anapplicationfactorof1.2isappropriate. Use a reliability of 96%.arrow_forwardQuestion No.13: A multiple disc clutch has three discs on the driving shaft and two on the driven shaft, providing four pairs of contact surfaces. The outer diameter of the contact surfaces is 250mm and inner diameter is 150mm. Determine the maximum axial intensity of pressure between the discs for transmitting 18.75kW at 500 rpm. Assume uniform wear and coefficient of friction as 0.3.arrow_forward-Two shafts made of plain carbon steel are connected by a rigid protective type flange coupling. The shafts are running at 500 r.p.m. and transmit 25 kW power. Design the coupling completely for overload capacity 25 percent in excess of mean transmitted torque capacity. Assume the following permissible stresses for the coupling components : Shaft — Permissible tensile stress = 60 MPq; Permissible shear stress = 35 MPa Keys — Rectangular formed end sunk key having permissible compressive strength = 60 MPa Bolts — Six numbers made of steel having permissible shear stress = 28 MPa Flanges — Cast iron having permissible shear stress =12 MDA~arrow_forward
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