32.Design and Fabrication of Experimental Dryer for Studying Agricultural Products
Transcript of 32.Design and Fabrication of Experimental Dryer for Studying Agricultural Products
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Fundamentals of Machine Elements, 3rd ed.
Schmid, Hamrock and Jacobson © 2014 CRC Press
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Spur Inexpensive, simple to design, no thrust load is de-veloped by the gearing, wide variety of manufac-turing options.
Can generate t noise, especially at highspeeds, and are usually restricted to pitch-line ve-locities below 20 m/s (4000 ft/min).
Helical Useful for high speed and high power applications,quiet at high speeds. Often used instead of spur
gears for high speed applications.
Generate a thrust load on a single face, more expen-sive than spur gears.
Bevel High ef y (can be 98% or higher), can transferpower across nonintersecting shafts. Spiral bevelgears transmit loads evenly and are quieter thanstraight bevel.
Shaft alignment is critical, rolling element bearingsare therefore often used with bevel gears. Thislimits power transfer for high speed applications(where a journal bearing is preferable). Can be ex-pensive.
Worm Compact and cost effective designs for large gearratios. Ef y can be as high as 90% or as low as50%, and is lower than for other gear sets.
Wear by abrasion is of higher concern than othergear types, can be expensive. Generate very highthrust loads. Worm cannot be driven by gear; wormmust drive gear.
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Fundamentals of Machine Elements, 3rd ed. Schmid, Hamrock and Jacobson
© 2014 CRC Press
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Fundamentals of Machine Elements, 3rd ed. Schmid, Hamrock and Jacobson
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Fundamentals of Machine Elements, 3rd ed. Schmid, Hamrock and Jacobson
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Fundamentals of Machine Elements, 3rd ed. Schmid, Hamrock and Jacobson
© 2014 CRC Press
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Fundamentals of Machine Elements, 3rd ed. Schmid, Hamrock and Jacobson
© 2014 CRC Press
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Fundamentals of Machine Elements, 3rd ed. Schmid, Hamrock and Jacobson
© 2014 CRC Press
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Fundamentals of Machine Elements, 3rd ed. Schmid, Hamrock and Jacobson
© 2014 CRC Press
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Fundamentals of Machine Elements, 3rd ed. Schmid, Hamrock and Jacobson
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Fundamentals of Machine Elements, 3rd
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© 2014 CRC Press
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100
90
80
70
60
50
40
30
20
10 N u m
b e r o f t e e t h o n g e a r f o r w h i c h
g e o m e t r y f a c t o r i s d e s i r e d
0.16 0.20 0.24 0.28 0.32 0.36 0.40
Geometry factor, Yb
Number of teeth in mate
13 15 20 25 30 35 40 45 50
60
70
80
90
100
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Fundamentals of Machine Elements, 3rd
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© 2014 CRC Press
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Fundamentals of Machine Elements, 3rd
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© 2014 CRC Press
Geometry factor, Y b
100
90
80
70
60
50
40
30
20
10
N u m b e r o f t e e t h o n
g e a r f o r w h i c h
g e o m e t r y f a c t o r i s d e s i r e d
0.16 0.20 0.24 0.28 0.32 0.360.12
Number of teeth in mate
60 80
100
5012 20 30 40
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Fundamentals of Machine Elements, 3rd
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© 2014 CRC Press
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Fundamentals of Machine Elements, 3rd
ed. Schmid, Hamrock and Jacobson
© 2014 CRC Press
Geometry factor, Yb
N u m b e r o f t e e t h i n g e
a r f o r w h i c h
g e o m e t r y f a c t o r i s
d e s i r e d
100
90
80
70
60
50
40
30
20
100.16 0.20 0.24 0.28 0.32 0.36 0.40
Number of teeth in mate
13 15 20 25 30 40 50
60 70 80 90 100
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Fundamentals of Machine Elements, 3rd
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Material Hardness Material Hardness Material factor
Case hardened steel 58 HRC Case hardened steel 60 HRC 0.85
Case hardened steel 55 HRC Case hardened steel 55 HRC 1.00
Flame hardened steel 50 HRC Case hardened steel 55 HRC 1.05
Flame hardened steel 50 HRC Flame hardened steel 50 HRC 1.05Oil hardened steel 375-425 HB Oil hardened steel 375-425 HB 1.20
Heat treated steel 210-300 HB Case hardened steel 55 HRC 1.45
Cast iron – Case hardened steel 55 HRC 1.95
Cast iron – Flame hardened steel 55 HRC 2.00
Cast iron – Annealed steel 160-200 HB 2.10Cast iron – Cast iron – 3.10
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Fundamentals of Machine Elements, 3rd
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Fundamentals of Machine Elements, 3rd
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dg = 2cd − dw
px =πdg
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Fundamentals of Machine Elements, 3rd
ed.
Schmid, Hamrock and Jacobson © 2014 CRC Press
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Fundamentals of Machine Elements, 3rd
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Schmid, Hamrock and Jacobson © 2014 CRC Press
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Fundamentals of Machine Elements, 3rd
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