Shigley's Mechanical Engineering Design (McGraw-Hill Series in Mechanical Engineering)
10th Edition
ISBN: 9780073398204
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 shaft journal diameter of 25 mm with a unilateral tolerance of -0.01 mm.
The bushing bore has a diameter of 25.04 mm with a unilateral tolerance of 0.03 mm. The /d ratio is
unity. The bushing load is 1.25 kN, and the journal rotates at 1200 rev/min.
Analyze the minimum clearance assembly if the average viscosity is 50 mPa s to find the minimum
oil film thickness, the power loss, and the percentage of side flow.
QUESTION 2
A pressure-fed bearing has a joumal diameter of 55.00 mm with a umilateral tolerance of -0.05 mm. The bushing bore diameter is 50.084 mm with a unilateral tolerance of 0.10 mm. The length of the
bushmg is 55 mm. Its central annular groove is 5 mm wide and is fed by SAE 30 oil is 55°C at 200 kPa supply gauge pressure. The journal speed is 2880 rev/min carrying a load of 10 EN. The sump ca
dissipate 300 watts per bearing if necessary. For minimum radial clearances, find the minimum film thickness and average temperature. Given the film temperature is 85° c
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QUE STION 3
A pressure-fed bearing has a journal diameter of 63.00 mm with a unilateral tolerance of -0.05 mm. The bushing bore diameter is 63 084 mm with a unilateral
tolerance of 0.010 mm.
The length of the bushıng is 58.00 mm. Its central annular groove is 8.00 mm wide and is fed by SAE 30 oil is 55°C at 195 kPa supply gauge presaure. The
journal speed is 2880 revimin carrying a load of 20 kN. The sump can dissipate 300 watts per bearing if necessary. For minimum radial clearances, find
the average temperature
Given the film temperature is 95°C
Chapter 12 Solutions
Shigley's Mechanical Engineering Design (McGraw-Hill Series in Mechanical Engineering)
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 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 Carrow_forwardA circumferential-groove pressure-fed bearing is lubricated with SAE grade 20 oil sup- plied at a gauge pressure of 30 psi. The journal diameter d; is 1.750 in, with a unilateral tolerance of -0.002 in. The central circumferential bushing has a diameter d of 1.753 in, with a unilateral tolerance of +0.004 in. The l' /d ratio of the two “half-bearings" that constitute the complete pressure-fed bearing is 1/2. The journal angular speed is 3000 rev/min, or 50 rev/s, and the radial steady load is 900 lbf. The external sump is maintained at 120°F as long as the necessary heat transfer does not exceed 800 Btu/h. (a) Find the steady-state average film temperature.arrow_forwardA pressure-fed bearing has a journal diameter of 59.00 mm with a unilateral tolerance of -0.05 mm. The bushing bore diameter is 50.084 mm with a unilateral tolerance of 0.10 mm. The length of the bushing is 55 mm. Its central annular groove is 5 mm wide and is fed by SAE 30 oil is 55°C at 200 kPa supply gauge pressure. The journal speed is 2880 rev/min carrying a load of 10 kN. The sump can dissipate 300 watts per bearing if necessary. For minimum radial clearances, find the minimum film thickness and average temperature. Given the film temperature is 85 ° Carrow_forward
- A lightly loaded full journal bearing has journal diameter of 25 mm, bush bore of 25.05 mm and bush length of 10 mm. If rotational speed of journal is 1000rpm and average viscosity of liquid lubricant is 0.01 Pa s, Determine power loss?arrow_forward68. A full journal bearing with a journal of 75 mm diameter and a bearing of 75 mm length is subjected to a radial load of 2500 N at 400 rev/min. The lubricant is SAE 30 at 75°C having a viscosity of 16.5 x 103 kg/ms. Radial clearance is 0.03 mm. Eccentricity of the bearing is 0.27. Find the Sommerfeld number and the minimum film thickness.arrow_forwardCompute for the Break Mean Effective Pressure with the following information: Given: Bhp = 1000 Stroke = 5 inches Bore = 5.5 inches Rpm = 2700 Number of cylinders = 8 *Show complete solution. Thank you.arrow_forward
- A fix inclined-plane thrust bearing is designed to carry a total normal load of50kN 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°C (μd = 29 cP). Determine the minimum film thickness assuming that the change in oil is negligible.arrow_forwardA full journal bearing is 28 mm long. The shaft journal has a diameter of 58 mm with a unilateral tolerance of -0.012 mm. The bushing bore has a diameter of 58.05 mm with a unilateral tolerance of 0.012 mm. The load is 3.4 kN and the journal speed is 320 rev/min. For the minimum clearance assembly find the minimum oil-film thickness, the power loss, and the side flow if the operating temperature is 65 °C and SAE 40 lubricating oil is used.arrow_forwardA lightly loaded full journal bearing has journal diameter of 50 mm, bush bore of 50.05 mm and bush length of 20 mm. If rotational speed of journal is 1200 rpm and average viscosity of liquid lubricant is 0.03 Pa s, the power loss (in W) will bearrow_forward
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