Most shafts serve to transmit torque from an input gear or pulley, through the shaft, to an output gear or pulley. Using press fit between the shaft and the components provides friction that prevents relative rotation between the components and the shaft. Introduction. Shafts and Shaft Components. Shaft rotating member used to transmit power or motion. Axle non rotating member that carries no torque. Slope at bearings and shaft-supported elements. ◦ Shear deflection due to transverse loading of short shafts. Vibration due to natural frequency. Shigley's.
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Shafts and Shaft Components - ppt download
Shafts can carry gears, pulleys and sprockets to transmit rotary motion and power via mating gears, belts and chains. A shaft may simply connect to another via a coupling. A shaft can be stationary and support a rotating member such as the short shafts which support shafts and shaft components non-driven wheels of automobiles, often referred to as spindles.
Machine elements such as gears, pulleys sheavesflywheels, clutches, and sprockets are mounted on the shaft and are used to transmit power from the shafts and shaft components device motor or engine through a machine. Press fit, keys, dowel, pins and splines are used to attach these machine elements on the shaft.
The shaft rotates on rolling contact bearings or bush bearings.
Shafts and Shaft Components
Various types of retaining rings, thrust bearings, grooves and steps in the shaft are used to take up axial loads and locate the rotating elements. Couplings are used to transmit power from drive shaft e. Size and spacing of components as on a general assembly drawingtolerances 2. Material selection shafts and shaft components material treatments 3.
Shaft (mechanical engineering)
Deflection and rigidity bending deflection torsional deflection slope at bearings shear deflection 4. Stress and strength static strength fatigue reliability 5.
Shaft Types Shaft- A rotating member used to transmit power. Axle- A stationary member used as support for rotating elements such as wheels, idler gears, etc. Spindle- A short shaft or axle e.
Stub shaft- A shaft that is integral with a motor, engine or prime mover and is of a size, shape, and projection as to permit easy connection to other shafts Line shaft- A shaft connected to a prime mover and used shafts and shaft components transmit power to one or several machines Jackshaft- Sometimes called countershaft.
Shaft (mechanical engineering) - Wikipedia
Keys and notches can also result in some unique shapes. Hollow Versus Solid Shafts Hollow shafts are lighter than solid shafts of comparable strength but are more expensive to manufacture.
Thusly hollow shafts are primarily only used when weight is critical. For example the propeller shafts on rear wheel drive cars require lightweight shafts in order to handle speeds within the operating range of the vehicle.
Surface hardening usually only used when the shaft is being used as a bearing surface. When steel is above shafts and shaft components recrystallization temperature, it can be shaped and formed easily, and shafts and shaft components steel can be made in much larger sizes.
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Hot rolled steel is typically cheaper than cold rolled steel due to the fact that it is often manufactured without any delays in the process, and therefore the reheating of the shafts and shaft components is not required as it is with cold rolled.
When the steel cools off it will shrink slightly thus giving less control on the size and shape of the finished product when compared to cold rolled. Hot rolled steel is used in situations where precise shapes and tolerances are not required.
Shafts and shaft components process will produce steel with closer dimensional tolerances and a wider range of surface finishes. The term Cold Rolled is mistakenly used on all products, when actually the product name refers to the rolling of flat rolled sheet and coil products.
This process results in higher yield points and has four main advantages: Turning gets rid of surface imperfections. Grinding narrows the original size tolerance range.
Polishing improves surface finish. All cold products provide a superior surface finish, and are superior in tolerance, concentricity, and straightness when compared to hot rolled. Cold finished bars are typically harder to work with than hot rolled due to the increased carbon content.
However, this cannot be said about cold rolled shafts and shaft components and hot rolled sheet. With these two products, the cold rolled product has low carbon content shafts and shaft components it is typically annealed, making it softer than hot rolled sheet.