Mechanics of Materials
11th Edition
ISBN: 9780137605460
Author: Russell C. Hibbeler
Publisher: Pearson Education (US)
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Chapter 11.2, Problem 18P
to safely support the load. The wood has an allowable normal stress of σallow = 1.5 ksi and an allowable shear stress of τallow =150 psi.
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CHAIN DRIVE DESIGN
Initial Input Data:
Application: Garage Door Opener
Drive type: AC Motor
Driven machine Chain and Sprocket to pull the door up
Degrees per Radian:
57.2958 degrees
Sprocket Diameter: D =
1.690 in
Number of strands:
Chain number:
1
40
Service factor:
1.3
Table 7-10
No. of
teeth
Computed Data:
Actual Motor Power Input:
0.000 hp
Sprocket Speed (for sprocket attached to
gear shaft)
Design power:
0.00 rpm
0 hp
11
12 0.06 0.15 0.29 0.56 0.99 1.09 1.61 2.64
TABLE 7-7
Horsepower Ratings-Single Strand Roller Chain No. 40
0.500 inch pitch
10 25 50 100 180 200 300 500 700 900 1000 1:
0.06 0.14 0.27 0.52 0.91 1.00 1.48 2.42 3.34 4.25 4.70 !
3.64 4.64 5.13
13
0.07 0.16 0.31 0.61 1.07 1.19 1.75 2.86 3.95
5.02 5.56
Design Decisions-Chain Type and Teeth Numbers:
14
Chain number:
Use Table 7-7
Chain pitch: p =
in
15
Number of Teeth: N =
Per Table 7-7
16
0.08 0.20 0.39 0.75 1.32 1.46 2.15 3.52
0.07 0.17 0.34 0.66 1.15 1.28 1.88 3.08
0.08 0.19 0.36 0.70 1.24 1.37 2.02 3.30 4.55 5.80…
Input Data:
Torque needed to overcome rolling friction in
rollers, slides and other moving parts, except for
Motor and Worm Gear
the worm gear
T₁ =
Length of travel of door:
Time for door to open or close:
LD =
50 lb-in.
90 in
t=
12.5 seconds
Pitch diameter for chain sprocket:
DPC
1.690 in
Weight of Door:
P =
No. of worm threads:
Nw
=
Worm Pitch diameter:
Dw
Diametral pitch:
Pd
Normal pressure angle:
Degrees per Radian:
Number of gear teeth:
Calculated Data:
Linear velocity of door and chain (in/sec):
Linear velocity of door and chain (ft/min):
Output Speed of Gear and Sprocket:
Upward Force due to Weight of Door:
Фо
=
=
NG=
240 lb
2
1.250 in
12
14.5 degrees
57.2958 degrees
28
Vα=
in/sec
VC=
ft/min
NG =
rpm
FD
lb
Net Upward Force on Door:
Fou
lb
Torque on gear ignoring rolling friction:
TG =
lb-in.
Formula
=
FDU FD-2 x Fo (note: Fo is the Max Operating load of
the extension springs). This is also the initial tension in
the chain.
TG = FDU X DPC/2 This is the also the torque on the…
Q5/A: A car with a track of 1.5 m and a wheelbase of 2.9 m has a steering gear
mechanism of the Ackermann type. The distance between the front stub axle pivots
is 1.3 m. The length of each track arm is 150 mm, and the length of the track rod is
1.2 m. Find the angle turned through by the outer wheel if the angle turned through
by the inner wheel is 30°.
(6 Marks)
Q5/B: Write True on the correct sentences and False on the wrong sentences
listed below:-
1- In automobiles, the power is transmitted from the gearbox to the differential
through bevel gears.
2- The minimum radius circle drawn to the cam profile is called the base circle.
3- The Proell governor, compared to the Porter governor, has less lift at the same
speed.
4- The balancing of rotating and reciprocating parts of an engine is necessary when
it runs at a slow speed.
(6.5 Marks)
***Best of Luck ***
جامعة بابل
UNIVERSITY OF BABYLON
Examiner:
Mohanad R. Hameed
Head of Department:
Dr. Dhyai H. Jawad
Chapter 11 Solutions
Mechanics of Materials
Ch. 11.2 - Determine the minimum dimension a to the nearest...Ch. 11.2 - of the rod to safely support the load. The rod is...Ch. 11.2 - The wood has an allowable normal stress of allow =...Ch. 11.2 - of the beam's cross section to safely support the...Ch. 11.2 - Determine the minimum dimension b to the nearest...Ch. 11.2 - The beam is made of steel having an allowable...Ch. 11.2 - Determine the minimum width of the beam to the...Ch. 11.2 - if P=10 kip.Ch. 11.2 - The beam has an allowable normal stress of allow...Ch. 11.2 - If each beam is to be designed to carry 90 lb/ft...
Ch. 11.2 - Determine its height h so that it simultaneously...Ch. 11.2 - to safely support the load. The wood has an...Ch. 11.2 - and the wood has an allowable normal stress of...Ch. 11.2 - if allow = 30 ksi and allow = 15 ksi. The journal...Ch. 11.2 - if allow = 30 ksi and allow = 15 ksi. The journal...Ch. 11.2 - The tapered beam supports a uniform distributed...Ch. 11.2 - Determine the variation in the depth d of a...Ch. 11.2 - Prob. 41PCh. 11.2 - The pulleys fixed to the shaft are loaded as...Ch. 11.2 - Prob. 43PCh. 11.2 - Prob. 44PCh. 11 - The cantilevered beam has a circular cross...Ch. 11 - Select the lightest-weight wide-flange overhanging...Ch. 11 - Prob. 3RPCh. 11 - Determine the shaft's diameter to the nearest...Ch. 11 - Select the lightest-weight wide-flange beam from...Ch. 11 - The simply supported joist is used in the...Ch. 11 - The simply supported joist is used in the...Ch. 11 - by 4-in. pieces of wood braced as shown. If the...
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