keyscouplingsandseals.pptVIP

Chapter 11 keys, couplings,and seals The big picture, you are the designer 11-1 objectives of this chapter 11-2 keys 11-3 materials for keys 11-4 stress analysis to determine key length 11-5 splines 11-6 other methods of fastening elements to shafts 11-7 couplings 11-8 universal Joints 11-9 retaining rings and other means of axial location 11-10 types of seals 11-11 seal materials Chapter 11 keys, couplings,and seals The big picture, you are the designer 11-1 objectives of this chapter 11-2 keys(键) 11-3 materials for keys 11-4 stress analysis to determine key length 11-5 splines(花键) 11-6 other methods of fastening elements to shafts 11-7 couplings 11-8 universal Joints 11-9 retaining rings and other means of axial location 11-10 types of seals 11-11 seal materials How two or more parts of a machine can be connected for the purpose of locating one part with respect to another. This chapter presents information on commercially available products that accomplish these functions. The generic categories of keys,couplings, and seals actually encompass numerous different designs. A key is used to connect a drive member such as a belt pulley, chain sprocket, or gear to the shaft that carries it. Torque and power are transmitted across the key to or from the shaft. Seals may be difficult to see because they are typically encased in a housing or are covered in some way. Their function is to protect critical elements of a machine from contamination due to dust,dirt, or water or other fluids while allowing rotating or translating machine elements to move to accomplish their desired functions. Seals exclude undesirable materials from the inside of a mechanism, or they hold critical lubrication or cooling fluids inside the housing of the mechanism. 8. Describe several types of flexible couplings. 9. Describe universal joints. 10. Describe retaining rings and other means of locating elements on shafts. 11. Specify suitable seals for shafts and other types of machine elements.