Heat and Mass Transfer: Fundamentals and Applications
5th Edition
ISBN: 9780073398181
Author: Yunus A. Cengel Dr., Afshin J. Ghajar
Publisher: McGraw-Hill Education
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cast-iron roller
FIGURE P11-3
Shaft Design for Problems 11-17
Chapter 11
BEARINGS AND LUBRICATION
677
gear
key
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assume bearings act
as simple supports
11-18 Problem 7-18 determined the half-width of the contact patch for a 1.575-in-dia steel
cylinder, 9.843 in long, rolled against a flat aluminum plate with 900 lb of force to be
0.0064 in. If the cylinder rolls at 800 rpm, determine its lubrication condition with ISO
VG 1000 oil at 200°F. R₁ = 64 μin (cylinder); R₁ = 32 μin (plate).
11-19 The shaft shown in Figure P11-4 was designed in Problem 10-19. For the data in the
row(s) assigned from Table P11-1, and the corresponding diameter of shaft found in
Problem 10-19, design suitable bearings to support the load for at least 5E8 cycles at
1200 rpm. State all assumptions.
(a)
(b)
Using hydrodynamically lubricated bronze sleeve bearings with ON = 40,
1/ d=0.80, and a clearance ratio of 0.002 5.
Using deep-groove ball bearings for a 10% failure rate.
*11-20 Problem 7-20 determined the…
Calculate the shear force at the point D on the beam below. Take F=19 and remember that
this quantity is to be used to calculate both forces and lengths.
15F
A
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"II-1 The shaft shown in Figure P11-I was designed in Problem 10-1. For the data in the
row(s) assigned from Table P11-1, and the corresponding diameter of shaft found in
Problem 10-1, design suitable bearings to support the load for at least 7E7 cycles at
1500 rpm. State all assumptions.
(a)
Using hydrodynamically lubricated bronze sleeve bearings with Ox = 20,
1/d=1.25, and a clearance ratio of 0.001 5.
assume bearings act
as simple supports
FIGURE P11-1
Shaft Design for Problem 11-1
11-2 The shaft shown in Figure P11-2 was designed in Problem 10-2. For the data in the
row(s) assigned from Table P11-1, and the corresponding diameter of shaft found in
Problem 10-2, design suitable bearings to support the load for at least 3E8 cycles at
2.500 rpm. State all assumptions.
(a)
Using hydrodynamically lubricated bronze sleeve bearings with ON=30,
1/d=1.0, and a clearance ratio of 0.002.
FIGURE P11-2
Shaft Design for Problem 11-2
Table P11-1 Data for Problems
assume bearings act
as simple…
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