In the previous articles, we have discussed the motion of belts and shafts assuming a firm frictional grip between the belts and the shafts. But sometimes, the frictional grip becomes insufficient. This may cause some forward motion of the driver without carrying the belt with it. This may also cause some forward motion of the…
Sometimes the power is transmitted from one shaft to another, through a number of pulleys, as shown in fig. Consider a pulley 1 driving the pulley 2. Since the pulleys 2 and 3 are keyed to the same shaft, therefore the pulley 1 also drives the pulley 3 which, in turn, drives the pulley 4….
The power from one pulley to another may be transmitted by any of the following types of belt drives: 1. Open belt drive. The open belt drive, as shown in Fig. 11.3, is used with shaftsarranged parallel and rotating in the same direction. In this case, the driver A pulls the belt from one side (i.e. lower side RQ) and delivers…
Though there are many types of belts used these days, yet the following are important from the subject point of view: 1. Flat belt. The flat belt, as shown in Fig. (a), is mostly used in the factories andworkshops, where a moderate amount of power is to be transmitted, from one pulley to another when the two…
The belt drives are usually classified into the following three groups: 1. Light drives. These are used to transmit small powers at belt speeds upto about 10 m/s,as in agricultural machines and small machine tools. 2. Medium drives. These are used to transmit medium power at belt speeds over 10 m/sbut up to 22 m/s, as in machine tools….
The v-belts are made of rubber with fabric cords to transmit power and its covered with a protective layer. The cords transmit the force from the driver to the driven pulley, thereby transmit the power. The number of cords are increased based on the force requirements. The rubber layer transmits the force in cord to the side…
Following are the various important factors upon which the selection of a belt drive depends: 1. Speed of the driving and driven shafts, 2. Speed reduction ratio, 3. Power to be transmitted, 4. Centre distance between the shafts, 5. Positive drive requirements, 6. Shafts layout, 7. Space available, and 8. Service conditions.
We have discussed in the previous topics the velocities of various points in the mechanisms. Now we shall discuss the acceleration of points in the mechanisms. The acceleration analysis plays a very important role in the development of machines and mechanisms. Acceleration diagram for a link Consider two points A and B on a rigid link as shown in…
The links in a mechanism are mostly connected by means of pin joints. The rubbing velocity is defined as the algebraic sum between the angular velocities of the two links which are connected by pin joints, multiplied by the radius of the pin. Consider two links OA and OB connected by a pin joint at O as shown in Fig. Let ω1 =…
In this, we shall discuss the relative velocity method for determining the velocity of different points in the mechanism. The study of velocity analysis is very important for determining the acceleration of points in the mechanisms. Kinematics deals with study of relative motion between the various parts of the machines. Kinematics does not involve study…