AUTOMATIC TRANS...-CLASSRM.+SHOP MANUAL
7th Edition
ISBN: 9781337792158
Author: ERJAVEC
Publisher: CENGAGE L
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Chapter 45, Problem 3SA
To determine
The reason for the recommendation of tire rotation by most manufacturers.
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Explain why on the interval 0<x<1000 mm and 1000<x<2000mm, Mt is equal to positive 160 Nm, but at x= 0mm and x=1000mm Mt is equal to -160 Nm (negative value!). What is the reason for the sign change of Mt?
20
3.
2-233
2520
Тр
Gears
1079
A pair of helical gears consist of a 20 teeth pinion meshing with a 100 teeth gear. The pinion rotates at
Ta
720 r.p.m. The normal pressure angle is 20° while the helix angle is 25°. The face width is 40 mm and
the normal module is 4 mm. The pinion as well as gear are made of steel having ultimate strength of
600 MPa and heat treated to a surface hardness of 300 B.H.N. The service factor and factor of safety
are 1.5 and 2 respectively. Assume that the velocity factor accounts for the dynamic load and calculate
the power transmitting capacity of the gears.
[Ans. 8.6 kW
4. A single stage helical gear reducer is to receive power from a 1440 r.p.m., 25 kW induction motor. The
gear tooth profile is involute full depth with 20° normal pressure angle. The helix angle is 23°,
number of teeth on pinion is 20 and the gear ratio is 3. Both the gears are made of steel with allowable
beam stress of 90 MPa and hardness 250 B.H.N.
(a) Design the gears for 20% overload carrying capacity from standpoint of bending strength and
wear,
(b) If the incremental dynamic load of 8 kN is estimated in tangential plane, what will be the safe
power transmitted by the pair at the same speed?
Chapter 45 Solutions
AUTOMATIC TRANS...-CLASSRM.+SHOP MANUAL
Ch. 45 - List five things that could cause premature...Ch. 45 - Define lateral and radial runout.Ch. 45 - Prob. 3SACh. 45 - Define dynamic and static wheel balance.Ch. 45 - Describe the proper procedure to seal a puncture...Ch. 45 - The rim offset is the vertical distance between...Ch. 45 - Prob. 7SACh. 45 - Explain why a TPMS relearn should be performed...Ch. 45 - A tire that wobbles from side-to-side is said to...Ch. 45 - A front tire has excessive wear on both edges of...
Ch. 45 - All of the following statements are correct...Ch. 45 - All of the following statements are correct...Ch. 45 - Which of the following statements about sidewall...Ch. 45 - All of these statements about improper wheel...Ch. 45 - Prob. 7MCCh. 45 - Technician A says that the front wheel bearings on...Ch. 45 - Technician A says that dynamic wheel imbalance...Ch. 45 - Technician A says that front bearing assembly...Ch. 45 - Technician A says that replacement wheel rims...Ch. 45 - Prob. 5ASRQCh. 45 - While choosing the correct tire for a vehicle:...Ch. 45 - Technician A says that on most vehicles, the...Ch. 45 - Prob. 8ASRQCh. 45 - Prob. 9ASRQCh. 45 - Prob. 10ASRQ
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