1. UFMF88-30-2 Design and Electromechanical systems
Dr Jason Matthews
UFMF
Design and Electromechanical systems
Tutorial 6 – Selection and analysis of bearings

2. Assignment Q&A New understanding? Information missing? 12/9/2018
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3. By the end of today You should have:
finished the bearing selection exercises
investigated the potential bearings in your solution(s)
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4. Example 1
Fr=15kN
Select a ball bearing having an internal diameter of 30mm suitable for the force of 15kN as shown.
We want a life expectancy of 60million revolutions. Considering that a1=a2=a3=1
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5. Example 2
F1=5kN
F2=5kN
Select a ball bearing having an internal diameter of 30mm suitable for two forces of 5kN as shown.
We want a life expectancy of 60million revolutions. Considering that a1=a2=a3=1
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6. Example 3
Fa=15kN
Select a Thrust bearing having an internal diameter of 40mm suitable for the axial force of 15kN as shown.
We want a life expectancy of 50million revolutions,
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7. Example 4
The system has an expected life of 5 years operating 250 days/year and 8 hours/day with the lay shaft rotating at a speed of 588rpm.
Force(N)
Bearing 1
Bearing 2
Vertical
2342
1618
Horizontal
940
1426
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8. The task
Knowing the expected life of the system and the loading applied to 55mm shaft. You are required to find the most appropriate bearings
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9. A thought for the near future: what about your design?
Where are the loads?
What type of bearings?
What type of housing?
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10. What about the motors
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11. What about the motors
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12. Motor Selection Process
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13. Pure torque
Torque(T):- calculated using the angular speed(ω) of the shaft and the power loading (P):
Example:
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