Manav Rachna International Institute of Research and Studies
School of Engineering & Technology
Mechanical Engineering
Subject Name: Machine Design Tutorial number: 05
Subject Code: BME-DS-604 Class / Semester: 6ME
Max. Marks : 10 Time Allowed: One Week
Unit-5 Bearings
Q.1 A taper roller bearing has a dynamic load capacity of 26 kN. The desired [CO-3 ,L-4]
life for 90% of the bearings is 8000 h and the speed is 300 rpm. Calculate
the equivalent radial load that the bearing can carry.
Q.2 A single-row deep groove ball bearing is subjected to a radial force of 8 [CO-4 ,L-4]
kN and a thrust force of 3 kN. The shaft rotates at 1200 rpm. The expected
life L10h of the bearing is 20 000 h. The minimum acceptable diameter of
the shaft is 75 mm. Select a suitable ball bearing for this application.
Q.3 A transmission shaft rotating at 720 rpm and transmitting power from the [CO-4 ,L-4]
pulley P to the spur gear G is shown in Fig. 15.8(a). The belt tensions and
the gear tooth forces are as follows: P1 = 498 N, P2 = 166 N, Pt = 497 N
Pr = 181 N. The weight of the pulley is 100 N. The diameter of the shaft at
bearings B1 and B2 is 10 mm and 20 mm respectively. The load factor is
2.5 and the expected life for 90% of the bearings is 8000 h. Select single
row deep groove ball bearings at B1 and B2.
Q.4 A single-row deep groove ball bearing is subjected to a 30 second work [CO-3 ,L-4]
cycle that consists of the following two parts:
The static and dynamic load capacities of the ball bearing are 50 and 68 kN
respectively. Calculate the expected life of the bearing in hours.
Prepared By: Approved By:
Dr. Nitin Kumar Waghmare Dr. Manoj Nayak
Course Coordinator (HOD, ME)
