Pdf a textbook of machine design keys and coupling ahmed. Detailed design procedure of a typical rigid flange coupling. Aug 12, 2018 here if the material of the key is as same as the shaft material then. To fulfill their essential role in a boats propulsion system, they must be prop erly selected and installed. The allowable shear stresses of the shaft, key and bolt materials are 60 mpa,50 mpa and 25 mpa respectively. Pdf design of a protected type flange coupling using. Securing the joint made with the help pressure fits, screws and pins. Design a clamp coupling to transmit 30 kw at 100 r. Skf is the world leader in the design, development and manufacture of high performance rolling bearings, plain bearings, bearing units and housings.
Flange with female pilot flange with male pilot f m hub b, design. Skf shaft couplings the following table shows typical character istics for various coupling types. Shaft design asme shaft equations design of shaft for torsional rigidity standard sizes of shafts bending and torsional moments prof. The shear modulus of the shaft material may be taken as 84gpa. Video lecture on problem on design of key from design of shafts, keys and couplings chapter of design of machine for mechanical. Keys and coupling keys a key is a piece of metal inserted between shaft and hub to connect these together in order to prevent relative motion between them types of keys 1. Design a rigid coupling for two shafts on the basis of torque, allowable shear stress in flange, in bolts connecting two flanges and in hub of the coupling. Find bending moments from gears, pulleys, or sprockets that are transmitting loads to or from other devices. Keys are used to transmit torque from a rotating machine element to the shaft.
The power produced from an engine of automobile can be transferred to the drive wheel by power transmission system. The most adjustable vertical pump coupling is also the easiest to install. Pdf design of a protected type flange coupling using python. The coupling key is usually made into two parts length of the key in each shaft l l23. Design for key the length of the coupling key n length of the sleeve i. How to read desigh data book for design of shaft,keys. The power is delivered to the shaft by some tangential force and the resultant torque or. Components such as gears are mounted on shafts using keys. If the design shearing stress is 5000 psi, the safe length is. The severe failure due to shearing of bolts head, key head, nuts and other. In designing a key, forces due to fit of the key are. Design of split muff coupling formulae design of shaft.
Woodruff keys work well near shaft shoulders and on tapered shafts. Use them in light duty applications to connect gears and other components to shafts. Coupling corporation of america quill shaft designs. The design equations used for the design of protected type flange coupling has been provided in steps below. Design a typical rigid flange coupling for connecting a motor and a centrifugal pump shafts. A keyway is a slot or recess in a shaft and hub of the pulley to accommodate a key.
Design of key for shaft in machine design extrudesign. The strength o f the members in flange coupling are should be go od enough for app lied load7. Keys and coupling introduction a key is a piece of mild steel inserted between the shaft and hub or boss of the. The shearing and crushing stresses for the key material are 42 mp and 70 mpa. Clamp or splitmuff or compression coupling, and flange coupling. Design the rectangular key for a shaft of 50 mm diameter.
Torque being transmitted no load t fd2 or f td2 this is the force chapter 11 keys, couplings and seals rjm 31604 the key must react. A key is a piece of mild steel inserted between the 18. Frictional shaft hubconnection sc bore diameter df or dm 025 hub b, type. Following types of rigid coupling are important from the subject point of view. Keys and coupling introduction a key is a piece of mild steel. Flanged coupling flanged couplings are the standard forms of couplings, widely used. Coupling design rfk coupling size of smaller coupling half 0050 type tbo material of the hub. We have discussed how the design of the key should be to transmit the full power of the shaft. Friction will help transmit torque and provide resistance to axial motion of the hub relative to the shaft. In a flanged coupling flanges are fitted or provided at the ends of the shafts the flanges are fastened together by means of a number of bolts and nuts. It is always inserted parallel to the axis of the shaft. Coupling design requirement, types, design of sleeve coupling. Coupling corporation of america quill shaft designs background a quill shaft, by definition, is a thin, solid shaft which is strategically designed and carefully machined so that it carries the same torque that a larger shaft would handle by operating at higher stress levels.
Keys, shafts and couplings free download as powerpoint presentation. Shaft keys and coupling mcq, mcqs on shaft keys and coupling, multiple choice questions on shaft key and coupling, shaft keys and coupling multiple choice question, shaft keys and coupling objective questions, quiz on shaft keys and coupling, mcq on shaft keys and coupling, shaft keys coupling quiz, shear force and bending moment diagram objectives questions,test series on sfd and bmd. Problem on design of key design of machine youtube. Sleeve coupling hollow cylinder which is fitted over the ends of the two shafts to be connected and is then keyed there to by a sunk key. The allowable shear stress for the shaft and key is 40 mpa and the number of bolts connecting the two halves are six. Page 4 of 18 in a shaft based system, the shaft and key are considered the fixed members of the system. The diameter of hub is usually taken as twice the diameter of shaft and length from 2 to 2. B specified minimum tensile strength of the material nmm2. Coupling corporation of america vertical clamp coupling. To provide for connection of shaft of units those are manufactured separately. The shafts that are connected by coupling should be easy enough to assemble and dismantle for the purpose of repair and alterations.
Design the section of kennedys key for heavy torque transmission on the basis of allowable shear and bearing stresses in key. Whether the need is an elastomeric or metallic design, dodge can provide a coupling with the potential to increase torque capacity, accommodate shaft misalignment, extend life, and put an end to unexpected downtime. The user enters the number of rotations of shaft in rpm 3 fos. Pdf design and failure analysis of flange coupling with. It is used to connect two shafts which are perfectly aligned. Using the patented anderson clamp hub design, it eliminates all keys and clamshells while allowing the user to easily change the position on the shaft, as well. As shown by the last equation in the box, key stress equals shaft stress when the key or hub length is 1. Design and make a neat dimensioned sketch of a muff coupling which is used to connect two steel shafts transmitting 40 kw at 350 r. Design tapered keys designed to be inserted from the end of the shaft after the hub is in position. Keys are used as temporary fastenings and are subjected to considerable crushing and shearing stresses. Design for key the length of the coupling key length of the sleeve i. To provide for misalignment of the shaft or to introduce mechanical flexibility. The connecting shaft is loaded primarily in torsion. The severe failure due to shearing of bolts head, key head, nuts and other projecting parts may cause accidents.
Video lecture on keys and its function from design of shafts, keys and couplings chapter of design of machine for mechanical engineering. Design of shafts, keys and couplings, design the diameter of a shaft on the basis of equivalent twistingbending moment and al. The material for the shafts and key is plain carbon steel for which allowable shear and crushing stresses may be taken. University of northern iowa midwests top public university.
The flange coupling body is made of gray cast iron c. Mptac6m2009 faq on metric bores and keyways in couplings mechanical power transmission association 5672 strand ct. The hub bore and key tolerances are adjusted to create the proper fit with the shaft. Preferred solution for coupling hubs and hollow shaft gearboxes series c600 keyless rigid couplings product specifications on pages 3031 costeffective shaft to shaft keyless coupling high torque and bending moment capacity preferred solution for torquearm mounted hydraulic drives available with stepped bore upon request. In this coupling two flanges are keyed at the end of each shaft by means of sunk keys. Machine design objectives after studying this unit, you should be able to describe types of shafts, take decisions to select the materials for shaft, estimate shaft diameters in different segments along length, and design couplings for shafts.
A key is a piece of mild steel inserted between the shaft and hub or boss of the pulley to connect these together in order to prevent relative motion between them. The permissible tensile stress for the bolts is 70 mpa. Key is used to transmit torque between shaft and the component mounted on the shaft. To download our notes please visit on my website link given below, dont forget to subscribe my channel or like it for engineering notes. The taper will impart a compressive contact pressure between the hub and the shaft. Sunk keys half in the keyway of the shaft and half in the key way of hub. Shaft design objectives compute forces acting on shafts from gears, pulleys, and sprockets. The keys in the coupling are designed in the normal manner and its depth is selected on the basis of shaft diameter which is calculated for transmission of torque. Flange with female pilot flange with male pilot f m hub a, design.
Shaft couplings are divided into two main groups as follows. The shaft used on the test is made of alloy steel type ss with max tensile stress of 723. Metric standard parallel keyway and key sizes shaft diameter mm keyway mm key mm from to width w depth h width w depth t 6 8 2 1. Keys and couplings free download as powerpoint presentation. This document mainly consists of the complete design of keys and couplings. Design and analysis of bushed pin flexible coupling. Shaft couplings are used in machinery for several purposes 1. Key is a machine element which is used to connect the transmission shaft to rotating machine elements like pulley, gear, sprocket or flywheel. Semifloating shaft couplings a reference for the usage of these couplings is shown in the left illustraion. The diameter, dp, of the tailshaft can be determined by the following formula 1. Keys and couplings mechanical engineering mechanics. Determine torque in shafts from gears, pulleys, sprockets, clutches, and couplings. Pdf a textbook of machine design keys and coupling.
For this reason it is place d at the end of a s haft. The dodge coupling product line can offer a solution to almost any customer need. Compare combined stresses to suitable allowable stresses. Coupling design requirement, types, design of sleeve. The forces acting on a key for a clockwise torque being transmitted from a shaft to a hub are shown in fig. Ppt includes the concept, theory bits and design procedures of shaft, keys and couplings which is helpful to diploma mechanical students of. In this case, the shaft of the coupling is supported with a single bearing, arranged as closely as possible to the outer sprocket or pulley. To be used in determining which coupling type or style. The user enters the factor of safety for shaft, key and bolt 4 fos2. Shaft a shaft is a rotating machine element which is used to transmit power from one place to another. Design of solid and hollow shafts based on strength, rigidity and critical speed keys, keyways and splines. The rectangular key is designed for a shaft of 50 mm diameter, width of key, 4 d w, w 12. Mcq on shaft keys and coupling mechanical engineering. Keys and coupling introduction a key is a piece of mild steel inserted between the shaft and hub or boss of the pulley to connect these together in order to prevent relative motion between them.
But modern couplings, particularly those made from alloy. August 15, 2007 3 standard diameters of shafts 5 to 8 14 3 to 5 18. Shaft must sustain a combination of bending and shaft must sustain a combination of bending and torsional loads. S t d 4 t l c d 2t f august 15, 2007 10 example problem 151. The material for the shafts and key is plain carbon steel for which allowable shear and crushing stresses may be taken as 40 mpa and 80 mpa respectively. A48 with maximum shear and tensile strength 50000 nmm2 2, 151. A rigid coupling is used when two shafts are perfectly aligned. A 4 inches shaft using a flat key whose width is 1 inch is transmitting a torque of 63000 inlb. Coupling design requirement, types, design of sleeve coupling design of coupling.
These keys have a rounded shape that makes them easy to remove when parts need to be taken apart frequently. Keys and couplings agricultural and biological engineering. Shafts are mounted in bearings and transmit power through devices such as gears, pulleys, cams and clutches. Bushed pin flexible in order to prevent relative motion between them. Design of flan ge coupling includes the design of hubs, flanges, key and bolts 4. The slot for gib head key must have an open end to permit assembly.
927 130 313 1274 1220 906 23 1178 1043 388 990 1037 987 1179 1775 40 132 1328 1135 302 547 1573 1160 761 1494 314 1252 1155