8. Design a two-speed gearbox suitable to transmit 25kW. The input shaft runs at 530rpm and carries two gears, A and B. The 2nd shaft carries two sliding gears, C and D. Gear C meshes with gear A, giving the driven shaft a speed of approximately 315rpm. Gear D meshes with B giving the driven shaft a speed of approximately 215rprn. The distance between the centres of the shafts is approximately 270mm and the teeth are 20 full depth involute. Using a module of 6mm and basic stress of 120MPa for all the gears, apply the Lewis formula and calculate: No of teeth for each gear [30;23;60,67] PCD for each gear [180; 138;360;402)mm True speed of gears C and D [216;27] Correct centre distance between the shafts (270) Width of the tooth material for each gear if [A&C 47mm; B&D:53mm] the basic stress is 120MPa, using the Lewis formula. a) b) c) d) e) f)

8. Design a two-speed gearbox suitable to transmit 25kW. The input shaft runs at 530rpm and carries two gears, A and B. The 2nd shaft carries two sliding gears, C and D. Gear C meshes with gear A, giving the driven shaft a speed of approximately 315rpm. Gear D meshes with B giving the driven shaft a speed of approximately 215rprn. The distance between the centres of the shafts is approximately 270mm and the teeth are 20 full depth involute. Using a module of 6mm and basic stress of 120MPa for all the gears, apply the Lewis formula and calculate: No of teeth for each gear [30;23;60,67] PCD for each gear [180; 138;360;402)mm True speed of gears C and D [216;27] Correct centre distance between the shafts (270) Width of the tooth material for each gear if [A&C 47mm; B&D:53mm] the basic stress is 120MPa, using the Lewis formula. a) b) c) d) e) f)

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Power Transmission Elements

It is defined as the energy transfer from one location to another location. The energy will start moving from the energy generation source to the energy applied position to obtain the work output. From this method, a large amount of electric energy moves from the power station to various electrical substations.

Question

80
Design a two-speed gearbox suitable to transmit
25kW. The input shaft runs at 630rpm and carries
two gears, A and B. The 2nd shaft carries two sliding
gears, C and D. Gear C meshes with gear A, giving
the driven shaft a speed of approximately 315rpm.
Gear D meshes with B giving the driven shaft a speed
of approximately 215rprn. The distance between the
centres of the shafis is approximately 270mm and the
teeth are 20° full depth involute. Using a module of
6mm and basic stress of 120MPa for all the gears,
apply the Lewis formula and calculate:
No of teeth for each gear [30;23;60,67]
PCD for each gear [180; 138,360;402)mm
True speed of gears C and D [216;27]
Correct centre distance between the shafts
(270)
Width of the tooth material for each gear if
[A&C:47mmm; B&D:53mm]
the basic stress is 120MPa, using the Lewis
formula.
a)
b)
d)
e)
f)

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