However, if we assume a triangular pressure distribution over the rod, as shown in. A mechanical joint is a section of a machine which is used to connect one or more mechanical part to another. A cotter is a flat wedgeshaped piece of steel as shown in figure. Sleeve type cotter joint to connect two shafts 25 mm eehand orthographic views of. Cotter joint piston tension physics free 30day trial. A key joint is used to transmit a positive drive bw two rotating parts whereas a cotter joint is used to transmit axial pull or push bw to rods and they do not rotate.
The knuckle joint assembly consists of the following major components. Cotter joint is widely used to connect the piston rod and cross head of the steam engine, so as a joint between the piston rod and the. Appropriate slots are cut in the sleeve and in the cylindrical rods. The cotter is usually made of mild steel or wrought iron. Chapter 7 cotter and knuckle joints machine design. This is used to connect rigidly two rods which transmit motion in the axial direction, without rotation. The factor of safety for rods, spigot end and socket end is assumed as 6 while for cotter. Cotter joint a cotter joint is used to connect rigidly two coaxial rods or bars which are subjected to axial tensile or compressive forces. Clevis fork joints with circlip or snapon securing collar, din 751 series jw winco knuckle joints oilfree bushings pressfit.
Ppt knuckle joint powerpoint presentation free to view. Failure of cotter joint may causes accident, so it is necessary to design cotter joint to withstand under tension without failure the effective design of mechanical device. This is used to connect rigidly two rods which transmit motion in the axial direction. Cotter and knuckle joints understanding engineers gallery.
What is the defference between key and cotter answers. Knuckle joints cylinder mounting components misumi. Mar 01, 2016 video lecture on design procedure of knuckle joint from design of cotter joint, knuckle joint,levers and offset links chapter of design of machine for mechanical engineering students. The maximum permissible stresses are 55 mpa in tension. Cotter joint cotter and knuckle joints are fasteners used to connect two roads transmitting axial force. Nov 07, 2009 cotter joint a cotter joint is used to connect rigidly two coaxial rods or bars which are subjected to axial tensile or compressive forces. Sleeve and cotter joint is a type of joint used to typically connect two similar coaxial cylindrical rods. Take factor of safety as 4 for tension, 6 for shear and 3 for crushing based on the tensile yield strength. It contains a sleeve and two wedge shaped tapered cotters. Video lecture on design procedure of cotter joint, socket and spigot joint from design of cotter joint, knuckle joint,levers and offset links chapter of design of machine for mechanical. There is always axial or linear line of action of load. This document is highly rated by mechanical engineering students and has been viewed 1593 times.
A knuckle joint is used to connect two rods which are under a tensile load. Following are the some of the applications of cotter joint. Aug 31, 2016 when there is a requirement of a small amount of flexibility or angular moment, knuckle joint is used. A typical knuckle joint, its components and working principle. Jul, 2017 chapter 7 cotter and knuckle joints machine design, mechanical engineering mechanical engineering notes edurev notes for mechanical engineering is made by best teachers who have written some of the best books of mechanical engineering. Ch12 contents contents cotter and knuckle joints c h a.
Cotter pin joints, teddy bear supplies, christie bears ltd. The material used for spigot end, socket end and the cotter is c 40 steel. In this joint, one end of the rod is formed into an eye and the other into a fork double eye. Keys, cotter and unit 5 key, cotter and knuckle knuckle.
Mohair bear making supplies limited cotter t pin joints. A gib is used along with the cotter to make this joint. Cut section of socket and spigot joint 3272012 2 hareesha n g, dsce, blore78. Like the concept on the cotter pin nice job 22 jul 2011 11. Clevis fork joints plain fork type, gn71752 series, inch jw winco knuckle joints toolless unit.
Mainly it is used to connect two rods which are not rotationg and which carry tensile as well as compressive load. Design of knuckle joint a knuckle joint is used to connect two rods which are under the action of tensile load, when small amount of flexibility or angular moment is necessary. A double riveted joint is that in which there are two rows. Gib and cotter joints are used for rods of square or rectangular cross section. Design of various types of riveted joints under different static loading conditions, eccentrically loaded riveted joints. Cotter joints, socket and spigot joint, sleeve and cotter joint gib and cotter joint, knuckle joint. This joint cannot sustain compressive force because of possible rotation about the pin. Basically, cotter joint is used in which there is no angular displacement between two rod o the other hand the knuckle joint is used in which there is necessity of angular displacement for e. These joints may be subjected to tensile or compressive forces along the axes of the rods. In this article, i am going to publish the detailed design procedure for knuckle joint. Mar 01, 2016 video lecture on design procedure of cotter joint, socket and spigot joint from design of cotter joint, knuckle joint,levers and offset links chapter of design of machine for mechanical. For making the joint, the eye end of the rod is aligned into the fork end of the other and then the pin is inserted through the holes. Design of temporary unit 2 design of temporary connections connections structure 2.
In this article, i am going to present a detailed design procedure for knuckle joint and cotter joint. Mechanical joints may be temporary or permanent, most types are designed to be disassembled. Each rod is subjected to an axial tensile force of 50 kn. May 16, 2020 chapter 7 cotter and knuckle joints machine design, mechanical engineering mechanical engineering notes edurev is made by best teachers of mechanical engineering. Gib is likely a cotter but with two gib heads at its ends. A cotter is a flat wedge shaped piece of rectangular cross section and its width is tapered either on one side or on both sides from one end to another for an easy adjustment. A hinged joint in which a pin fastens the ends of two rods, one of which has an eye that fits between the two perforated projections of the other. Most mechanical joints are designed to allow relative movement of these mechanical parts of the machine in one degree of freedom, and restrict movement in one or more others. Gib is like a cotter but with two gibgib is like a cotter but with two gib heads at its ends. Clearances between the cotter and slots in the rod end and socket allows the driven cotter to draw together the two parts of the joint until the. The cotter passes through slots made in two coaxial parts and thus prevent the relative motion between them.
Cotter joints a cotter is a flat wedgeshaped piece of steel this is used to connect rigidly two rods which transmit motion in the axial direction, without rotation. Dimensions can be determined using these empirical relations and the strength equations can be then used as a check. Cotter joint is widely used to connect the piston rod and cross head of the steam engine, so as a joint between the piston rod and the tailor pump rod, foundation bolt etc. It has socket end,spigot end and cotter as main parts. When the cotter is inserted into the slot, the central portion of cotter comes in contact with spigot and the spigot gets pushed into the socket till the collar of the spigot comes in contact with the collar of socket. The subject of this project is the modeling and analysis of cotter joint. A hinged joint in which a pin fastens the ends of two rods, one of which has an eye. A cotter is a flat wedgeshaped piece of steel as shown in figure4. A knuckle joint is understood to be a hinged joint in which projection in one part enters the recess of the other part and two are held together by passing a pin through coaxial holes in two parts. Christie bears limited office 5, pyle enterprise centre, village farm industrial estate, village farm road, pyle, bridgend, cf33 6bl tel. The design of these types of joints are discussed, in detail, in the. A hinged joint in which a pin fastens the ends of two rods. Gib and cotter joint for rectangular rodsgib and cotter joint for rectangular rods one bar end is made in the form of a strap a gib is used along with the cotter.
In this we will create knuckle joint by utilizing part modelling and assembly modelling capabilities of creo parametric 3. Cotter and knuckle joint part 1 mechanical engineering. When there is a requirement of a small amount of flexibility or angular moment, knuckle joint is used. Knuckle joint a knuckle joint is a pin joint used to fasten two circular rods. The knuckle joint is a type of joint which is used in steering system in between the steering rod and pinion of the steering gear, as the line of the action axis of both the mechanical parts are intersecting and lies in different planes, so it is. A knuckle joint is used to connect the two rods which are under the tensile load when there is requirement of a small amount of flexibility or when angular movement is necessary.
Cotter joint is used to connect two rods subjected to axial tensile or compressive loads. The construction of cotter joint, used to connect two rods subjected to tensile force p is shown in the figure. Design procedure of knuckle joint design of machine youtube. A cotter joint is used to connect two coaxial rods, which are subjected to either axial tensile force or axial compressive force. Online catalogue teddy bear joints cotter pin joints.
Material of two rods and cotter is steel 30 c8 s yt 400nmm2, s yc 2 s yt and s sy 0. Following are the three commonly used cotter joints to connect two rods by a cotter. Some standard proportions for dimensions of the knuckle joint are taken as. It is also used to connect a rod on one side with some machine part like a crosshead or base plate on the. Design a socket and spigot cotter joint to connect two steel rods of equal diameter. A cotter joint is a temporary fastening and is used to connect rigidly two co axial rods or bars which are subjected to axial tensile or compressive force. When the cotter is inserted into the slot, the central portion of cotter comes in contact with spigot and the spigot gets pushed into the socket till the collar.
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