Connect 1-semester Access Card For Shigley's Mechanical Engineering Design
10th Edition
ISBN: 9780077591632
Author: Richard G Budynas; Keith J Nisbett
Publisher: McGraw-Hill Education
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Chapter 12, Problem 6P
To determine
The minimum film thickness for the bearing.
The power loss due to friction.
The percentage of side flow for the minimum clearance assembly.
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A full journal bearing has a journal diameter of 25 mm, with a unilateral tolerance of -0.03 mm. The bushing bore has a diameter of 25.03 mm and a unilateral tolerance of 0.04 mm. The 1/d ratio is 1/2. The load is 1.2 kN and the journal runs at 1100 rev/min. If the average viscos- ity is 55 mPa • s, find the minimum film thickness, the power loss, and the side flow for the minimum clearance assembly.
A pressure-fed bearing has a journal diameter of 75.00 mm with a unilateral tolerance of -0.05 mm. The bushing bore diameter is 75.084 mm with a unilateral tolerance of 0.010 mm.The length of the bushing is 62.00 mm. Its central annular groove is 12.00 mm wide and is fed by SAE 30 oil is 53 °C at 200 kPa supply gauge pressure. The journal speed is 2880 rev/min carrying a load of 30 kN. The sump can dissipate 300 watts per bearing if necessary. For minimum radial clearances, find:
the average temperature.
Given the film temperature is 85 o C
A 25mm radius shaft is forced at 300 mm/s inside a 25.5 mm radius bearing sleeve having a length of 230 mm. the clearance between them is filled with oil (SG = 0.8) having a kinematic viscosity of 0.003 m²/s. what is the force on the shaft exerted by the oil? Select the correct response: 24.7 N 276.4 N 360 N 64.8 N 76.1 N
Chapter 12 Solutions
Connect 1-semester Access Card For Shigley's Mechanical Engineering Design
Ch. 12 - A full journal bearing has a journal diameter of...Ch. 12 - A full journal bearing has a journal diameter of...Ch. 12 - A journal bearing has a journal diameter of 3.000...Ch. 12 - Prob. 4PCh. 12 - Prob. 5PCh. 12 - Prob. 6PCh. 12 - Prob. 7PCh. 12 - Prob. 8PCh. 12 - A full journal bearing is 28 mm long. The shaft...Ch. 12 - A 114114 in sleeve bearing supports a load of 700...
Ch. 12 - A full journal bearing has a shaft diameter of...Ch. 12 - Prob. 12PCh. 12 - Prob. 13PCh. 12 - A natural-circulation pillow-block bearing with...Ch. 12 - An eight-cylinder diesel engine has a front main...Ch. 12 - A pressure-fed bearing has a journal diameter of...Ch. 12 - Design a central annular-groove pressure-fed...Ch. 12 - Repeat design problem Prob. 1218 using the nominal...Ch. 12 - Table 12-1 gives the Seireg and Dandage curve fit...Ch. 12 - For Prob. 1218 a satisfactory design is...Ch. 12 - An Oiles SP 500 alloy brass bushing is 0.75 in...Ch. 12 - Prob. 23P
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- A full journal bearing with a journal of 75 mm diameter and a bearing of 100 mm length is subjected to a radial load of 3000 N at 450 rpm. The visosity of oil is 16.5* 10 kg/m-sec. Radial clearance is 0.03 mm and eccentricity is 0.27 find somerfield number and minimum film thickness.arrow_forwardIt has a full-slide type bearing rotating at a speed of 1975 rpm.A load of 5693 N is applied. SAE 40 oil in bearing at 60C inlet temperatureplanned to be used.Shaft and bushing diameters in bearing with tolerance data 41−0.010 respectively+0.000mmand 41.125−0.000+0.100 mm.Average radial clearance mounting for this bearing with bush length 20.50 mmCalculate the following;a) Bearing characteristic number,b) Minimum lubricant film thickness,c) Eccentricity value,d) coefficient of friction,e) Average oil film temperature andf) Find the Tmax temperature value.arrow_forwardA natural feed journal bearing of diameter 50mm and length 50mm operating at 20rev/s. Carries a load of 2KN. The lubricant used has a viscosity of 20MPa. The radial clearance is 50um. The Sommerfeld number for the bearing?arrow_forward
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