 Hello Eurya, Myself Sachin Rathod working as assistant professor in mechanical engineering department from Vulture Institute of Technology, Sallapur. Today we are dealing with the topic rolling contact bearing. So in that we are going to see the rolling contact bearing part one. Just we will see what are the classification of the bearing and the introduction about the bearing in this session. So the learning outcome of this session is at the end of this session the learner will able to identify the rolling contact bearing. So now we will see the introduction about the bearing. The bearing is a mechanical element we are using such kind of the bearing in the machine wherever if I want to support the shaft I have to mount the bearing on the shaft and to reduce the friction we have to use the bearing. So it is called as a mechanical element. The function of the bearing is to guide the relative motion between the two parts such as the shaft and the housing with minimum friction and to supports the load acting on the shaft. So main purpose of this bearing is to reduce the friction and to support the shaft. The friction between the element of the bearing is rolling one. So if you consider this is a roller or the ball it is going the relative motion with respect to the inner race and outer race it should be in the rolling one. So as there is a minimum friction it is called as an anti-friction bearing. See the construction of the bearing. So you can pause this video and think about how the bearing are constructed means how the assembly of the bearings they are done. If you can think about this you will see what are the various elements they are going to use for assembling this rolling bearing or the ball bearing. For that purpose you should know the various elements are used in the bearing. First one is the inner race. So if you are observing this part is nothing but the inner race of the bearing is the first element. Second element the balls or the rollers. So these are the balls which is equally spaced. I will use the different color. These are the balls or the rollers. Currently in this deep groove ball bearing we are observing that the rolling elements as a ball. Next third element is a cage or retainer. So this is a cage. It supports to the ball means the ball positions will not get shifted due to the cage or the retainer and the fourth element is a outer race. So this is a outer race for the ball bearing. So they are the four elements we are going to use to construct the bearing that are inner race, outer race, ball and the cage or retainer. Next is classification of the bearing. So the mainly the bearing are classified into the two types. One is ball bearing and second one is the roller bearing. So if you observe the ball bearing and the roller bearing it is depending upon the point of contact. So in case of the ball bearing here the single point of contact is there. So because of the single point of contact the wear rate is very less and in case of the line contact it is forms one line that is the contact between your the rolling elements and your the inner and outer race. So in this case we are observing the more wear rate but the advantages of the rolling contact bearing is that it sustain the maximum load carrying capacity as compared to the deep groove ball bearing. Next classification of the bearing is radial bearing and the thrust bearing. So as if you are observing this figure, so in this figure depending upon the direction of the load it is going to classified as radial bearing and the roller bearing. So if you observe this, this is the shaft on which we are mount the bearing. So the load acting on the bearing on the shaft will be the perpendicular to the axis of the shaft that is why it is called as radial bearing. This is the second type that is the thrust bearing in which the load is acting parallel to the axis of the shaft here as the bearing is mounted. So this is your the thrust bearing. Next one is the types of the rolling contact bearing. So these are the types of the rolling contact bearing, deep groove ball bearing, cylindrical roller bearing, angular contact bearing, self aligned bearing, spherical roller bearing and taper roller bearing and the thrust ball bearing. So we are going to see one by one in details in the next slide. So first one is a deep groove ball bearing. So the deep groove ball bearing having the high load carrying capacity as compared to the roller bearing, the deep groove ball bearing is having the higher load carrying capacity which is acting in the perpendicular to the axis of the shaft. It takes the load in the radial as well as the axial direction. So this is the advantages of this bearing is that it carries the both load in the radial as well as the axial as compared to your the roller bearing. If you consider your the roller bearing, the roller bearing will sustain only the radial load. Due to the point contact between the ball and the recess, the frictional losses and the results in temperature rises is less in this bearing. So as we discussed in the previous slide, the resultant temperature rises is less in the in the deep groove ball bearing because there is a point contact as compared to your roller bearing. Deep groove ball bearing generates less noise due to the point contact. Definitely as compared to your the roller bearing, here is only the point contact is there. So it generates the less noise. But the disadvantages of the deep groove ball bearing is that if there is a misalignment in the shaft, it will get fail. The next classification is cylindrical roller bearing. When the maximum load carrying capacity required in a given space, the point contact of the ball bearing is replaced by the line contact roller bearing. So if you consider your the previous type of the bearing is the deep groove ball bearing. If the load is maximum then we can replace the deep groove ball bearing to the cylindrical roller bearing because this is having the capacity of the more load sustained. It will sustain the more load and the disadvantages of this bearing is that it will not carry any kind of the axial load. Also the disadvantages is if there is a misalignment in the shaft, it will not sustain that misalignment. Then the next type of the bearing is the angular contact bearing. So if you observe this, it is the grooves are provided to the inner race and the outer race. So this is your the inner race and the outer race on which we are providing the grooves. So in between the grooves we are going to rotate the or we are going to place the balls. The grooves in the inner and the outer race are so shaped that the line of the reactions at the contact between the ball and races makes the angle with the axis of the bearing. Means what? If this is your the axis of the bearing, this balls makes a certain angle. So it carries the maximum load in the axial as well as the radial directions as compared to the deep groove ball bearing. So this is the advantages of this angular contact bearing. Next classification is self aligned bearing. So if you observe this figure in which the self aligned bearing is used, self aligned bearing is nothing but if there is a misalignment in the shaft that misalignment will sustain by this bearing. The application where the misalignment can arises due to the error in the mounting or due to the deflection of the shaft. So at that time we can use the self aligned bearing. Next one is a spherical roller self aligned bearing. So if the load will not sustain by the self aligned bearing, if there is a misalignment in the shaft then we can prefer the spherical roller self aligned bearing. Next one is a taper roller bearing. So in this figure we are observing that the taper is providing to the roller. So it having the capacity to sustain the radial as well as the axial load because if you observe your the deep groove ball bearing and the cylindrical bearing in that the deep groove ball bearing will sustain the radial as well as the axial force but it is having the less capacity to sustain the axial load. And if you consider the roller bearing in that it is having the capacity to sustain the radial load, it will not sustain the axial load. So at that time we can prefer the taper roller bearing. So in this taper roller bearing having the capacity to take the heavy radial as well as the thrust load. But the disadvantage of this bearing is that if we are using only the single taper roller bearing it will having the axial thrust because of that this portion of the bearing will get separated or it will get moves along your the axial direction of the shaft because of that we have to use the two taper roller bearing simultaneously on the shaft to nullify the axial thrust. The taper roller bearing has more rigidity as compared to your the deep groove ball bearing and the cylindrical bearing. The taper roller bearing can easy assembles and the disassembled due to the separable parts. So in the animations you will get the assembly of the taper roller bearing. Next classification is a thrust ball bearing. The thrust ball bearing consists of the two rows of balls running between the two rings the shaft ring and the housing ring. So this is a shaft on which the load is acting along the shaft at that time we can prefer the thrust bearing. The thrust bearing carries the thrust load in only one direction and cannot carries the radial load. So it will not sustain the radial forces. So this is the drawback of this thrust bearing. Then the next one is a needle roller bearing. It has a cylindrical roller that are small in diameter relative to the length. So as compared to your the cylindrical bearing we are already seen in the second slide. So as compared to that the diameter is relatively less as compared to the length. So when it is required or when there is a low load at that time we can prefer the needle roller bearing where the radial only the radial load is going this is my references. Thank you.