In other words, a flywheel controls the speed variations caused by the fluctuation of the engine turning moment during each cycle of operation. The governor automatically controls the supply of working fluid to the engine with the varying load condition and keeps the mean speed within certain limits.Īs discussed above, the flywheel does not maintain a constant speed it simply reduces the fluctuation of speed. On the other hand, when the load decreases, less working fluid is required. when the load on the engine increases, it becomes necessary to increase the supply of working fluid. It regulates the mean speed of an engine when there are variations in the load, e.g. The function of a governor in engine is entirely different from that of a flywheel. The major axis lies in the plane of rotation and provides double the resistance against bending moment.ġ5. The flywheel arms are made of elliptical with major axis twice the minor axis. What are the advantages of having elliptical section of flywheel arm? On what basis the material of flywheel is selected?ġ4. Therefore, the major axis of the arms must be parallel to the tangential force F acting on the flywheel.ġ3. This bending moment lies in the plane of rotation of the flywheel. The arm may be assumed as a cantilever fixed at the hub and carrying the load at the rim end.
The arms may have to carry the full torque load due to high inertia of the flywheel when the energy input to its shaft is cut off. Write done the reason for this arrangement. In a flywheel, the major axis of the elliptical section of the arm is the plane of rotation. It is designed under shear stresses produced due to the combined action of torsion and bending moment.ġ2. Under what consideration the shaft for a flywheel is designed? This results in more strength than circular sectionġ1. This shape helps in more section modulus for the dame weight. Due to centrifugal forces acting on the rim, the flywheel arms will be subjected to - stressesġ0. Coefficient of fluctuation of speed is - of maximum fluctuation of speed and the mean speedĩ. Flywheel does not maintain a constant speed. Governor regulates the mean speed of an engine when there are variations in load by changing the supply of working fluid. What is the difference in the function of governor and a flywheel? It helps the crank shaft to run at uniform speed by performing its primary functionħ. In IC engine or stem engine the energy is developed during the power stroke, no energy is developed during suction, compression and exhaust strokes in 4 stroke engine. It stores energy during idle stroke and releases during working stroke. It decreases the fluctuation of speed due to difference in output and inputĬ. It decreases the variation of speed during each cycle of punching machine.ī.
Use of flywheel in punching machine is due to the following reasons:Ī. Why flywheels are used in punching machines? Small rimmed type flywheels are manufactured with solid web or holes drilled in the web.ĥ. Rimmed type flywheels with arms are preferred because they can store more energy. Solid disc type flywheel is rarely used because they have less capacity of storing energy. Rimmed type with either arms or solid web What are the various types of flywheel?ī.
Shrinkage stresses due to the unequal rate of cooling of casting.Ĥ. Tensile bending stress due to restraint of the armsĬ. Tensile stress due to the centrifugal forceī.