MAE 454 Quiz 6 Soln(1)
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West Virginia University *
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Course
454
Subject
Aerospace Engineering
Date
Dec 6, 2023
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MAE 454 –Quiz 6
October 20, 2023
The quiz is closed book and notes. You are not permitted to work or share your
responses with anyone.
Assume gravity acts vertically down. Place your responses in
the space provided. (100 points)
1. In the
C
10
equation for roller bearings, why would the value of
C
10
be significantly
greater than the radial load (
F
D
) found from the free body diagram analysis? (10 points)
The primary parameters that cause the
C
10
value
to be significantly greater than the
F
D
value are
the relative life
x
D
and reliability
R
D
. The application factor
a
f
also attributes to the
C
10
value.
2. In the
C
10
equation for roller bearings, what does the
a
parameter represent? (10
points)
The slope of the bearing load-life is represented by
a
.
3. What type of roller element bearings is shown? (10 points)
A straight cylindrical bearing.
4. What roller element bearing type(s) can support significant radial and axial or thrust
loads? (10 points)
A tapered roller bearing.
5. Provide two conditions when oil should be used as the lubricant for a roller element
bearing. (20 points)
Speeds are high, temperatures are high (>200 °F), oiltight seals are employed, bearing
is not suitable for grease, a central oil supply is available.
6. How does the bearing inner ring fillet radius affect shaft design? (10 points)
The bearing fillet radius must be greater than the shaft fillet radius at a step. Therefore,
the bearing fillet radius limits the maximum shaft fillet radius. This radius will affect the
stress concentration factor at the shaft step.
7. What is the static load rating value for a 17
mm
bore deep groove ball bearing? Use
the chart below. (10 points)
4.50 kN
8. For a catalog load rating of 49.0
kN
, what minimum bore diameter is available for a
angular contact ball bearing? Use the chart below. (20 points)
60 mm
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