Automotive Technology: Principles, Diagnosis, And Service (6th Edition) (halderman Automotive Series)
6th Edition
ISBN: 9780135257272
Author: James D. Halderman
Publisher: PEARSON
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Textbook Question
Chapter 32, Problem 1RQ
How is the camshaft driven by the crankshaft?
Expert Solution & Answer
To determine
Identify how the camshaft is driven by the crankshaft.
Explanation of Solution
In an engine, the opening and closing of the valves are timed and the actuating mechanism for the fuel pumps and injectors are controlled by the camshaft. The camshaft is driven by the crankshaft through a belt or chain drive. In a four stroke engine, the speed of the camshaft is half of the crankshaft and for a two stroke engine; the speed is the same for both.
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6/86 The connecting rod AB of a certain internal-combustion engine weighs 1.2 lb with mass center at G
and has a radius of gyration about G of 1.12 in. The piston and piston pin A together weigh 1.80 lb. The
engine is running at a constant speed of 3000 rev/min, so that the angular velocity of the crank is
3000(2)/60 = 100л rad/sec. Neglect the weights of the components and the force exerted by the gas in
the cylinder compared with the dynamic forces generated and calculate the magnitude of the force on the
piston pin A for the crank angle 0 = 90°. (Suggestion: Use the alternative moment relation, Eq. 6/3, with B
as the moment center.)
Answer
A = 347 lb
3"
1.3"
B
1.7"
PROBLEM 6/86
6/85 In a study of head injury against the instrument panel of a car during sudden or crash stops where
lap belts without shoulder straps or airbags are used, the segmented human model shown in the figure is
analyzed. The hip joint O is assumed to remain fixed relative to the car, and the torso above the hip is
treated as a rigid body of mass m freely pivoted at O. The center of mass of the torso is at G with the initial
position of OG taken as vertical. The radius of gyration of the torso about O is ko. If the car is brought to a
sudden stop with a constant deceleration a, determine the speed v relative to the car with which the
model's head strikes the instrument panel. Substitute the values m = 50 kg, 7 = 450 mm, r = 800 mm, ko
= 550 mm, 0 = 45°, and a = 10g and compute v.
Answer
v = 11.73 m/s
PROBLEM 6/85
Chapter 32 Solutions
Automotive Technology: Principles, Diagnosis, And Service (6th Edition) (halderman Automotive Series)
Ch. 32 - How is the camshaft driven by the crankshaft?Ch. 32 - What drives the high-pressure fuel pump on a GDI...Ch. 32 - What is meant by an interference engine?Ch. 32 - How does variable valve timing help improve engine...Ch. 32 - The camshaft makes __________ for every revolution...Ch. 32 - A DOHC V-6 has how many camshafts? a. 4 b. 2 c. 3...Ch. 32 - Which timing chain type is also called a silent...Ch. 32 - Many technicians always use new pushrods because...Ch. 32 - Hydraulic valve lifters can make a ticking noise...Ch. 32 - Hydraulic lifters or hydraulic lash adjusters...
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