There are 3 type of gib and cotter joints gib and cotter joints cotter without. Also in our syllabus there is only one cotter joint for joining square or rectangular rods and it is called. Jan 08, 2011 gib and cotter joints are used for rods of square or rectangular cross section. The cotter is usually made of mild steel or wrought iron. After modeling on catia v5r19, we will analyze cotter joint on software named as ansys v15. To understand the type of fits and tolerances used in assembly.
In a gib and cotter joint, the gib and cotter are subjected to ies2006 a single shear only b double shear only c single shear and crushing d double shear and crushing 4. Design of welded joints welding symbols, stresses in fillet and butt 12. 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. The effect of stress concentration due to the slot is neglected. In order to design the cotter joint and find out the dimensions, failures in different parts and at different crosssections are considered. Appropriate slots are cut in the sleeve and in the cylindrical rods. Design of gib and cotter joint for square rods engineers. Match list i items in joints with list ii type of failure and select the correct answer using the codes given below the lists. The design of these types of joints are discussed, in detail, in the following pages.
A cotter is a flat wedge shaped steel piece of rectangular crosssection and its width is tapered either on. Based on each type of failure, one strength equation is written and these equation is used to determine the various dimensions of the cotter joint. Socket and spigot cotter joint sleeve and cotter joint. Cotter joint is used to connect two rods or components which are subjected to tension or compression. Gib and cotter joint creo part design and assembly 3d.
Design of cotter joint a cotter is a rectangular element. The rods may be subjected to a tensile or compressive load. P load on the joint or pull acting on rods, d diameter of the rod, d1 outer diameter of socket,d2 diameter of spigot or inside diameter of socket, d3 outside diameter of spigot collar,d4 diameter of socket collar, t1 thickness of spigot collar, a distance from the end of the slot to end of spigot, c thickness. Following are the three commonly used cotter joints to connect two rods by a cotter. 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. A gib is used along with the cotter to make this joint. Cotter joint uses one or two cotters to connect two rods rigidly transmitting forces and motion, with no rotation of the rods 3.
It is usually used in connecting a piston rod to the crosshead of a reciprocating steam engine, a piston rod and its extension. Sleeve cotter joint pdf the working of the cotter andsleeve and cotter and gib are shown below. Mar 05, 2018 the career today youtube channel provide videos of various mechanical engineering courses, 6th to 12th class subjects and latest job information, career guide, exam strategies etc. In a gib and cotter joint, the gib and cotter are subjected to ies2006 a single shear only b double shear only. Sleeve and cotter joint is a type of joint used to typically connect two similar coaxial cylindrical rods it contains a sleeve and two wedge shaped tapered cotters appropriate slots are cut in the sleeve and in the cylindrical rods the cotters are assembled in 7. Design procedure of cotter joint, socket and spigot joint. 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. Socket and spigot cotter joint the socket and spigot cotter joint is shown in fig. Split nut is a locking device in which a one smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming. Questions on machine design multiple choice questions and.
Unit 3 deals with the design of threaded fasteners, design of bolted joints, knuckle joints, cotter joints, design of welded and riveted joints for structures and theory of bonded joints. Consider a gib and cotter joint for square rods as shown in fig. A knuckle joint is used to connect two rods which are under a tensile load. Sometimes, a sleeve and cotter joint as shown in fig. In this type of joint, a sleeve or muff is used over the two rods and then two cotters one on each rod end are inserted in the holes provided for them in the sleeve and rods. Nov 29, 20 a gib with negativ e matching taper is inserted along with the cotter, thus providing the joint a larger bearing area and a greater holding force between the cotter and the rods to be connected through the cotter, as shown in thereby considerably reducing the tendency of th e cotter to slacken. 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.
Design of joint objective questions ies, ias, gate cotters 1. Design of riveted joints material for rivets, modes of failure, efficiency of joint, design of boiler and tank joints, structural joints. What is a cotter joints a cotter is a flag wedge shaped piece of steel. If the allowable stresses in tension, compression and shear for the socket, rod and cotter be t. In this we will create cotter joint by utilizing part modelling and assembly modelling capabilities of creo parametric 3. Cotter and knuckle joints gib and cotter joint, analysis of knuckle joint. 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. Design of socket and spigot cotter joint linkedin slideshare. Cotter a cotter is a flat wedge shaped piece of rectangular cross section and its width is tapered either on one side or on. Design of various types of riveted joints under different static loading conditions, eccentrically. Split nut is a locking device in which a one smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming b a slot is cut partly in middle of nut and.
Design procedure for sleeve and cotter joint youtube. Sleeve and cotter joint and its design engineers gallery. Now, let us learn more about the sleeve and cotter joint rzqordghgiurpzzz vwxglhvwrgd\ frp. Sometimes to prevent loosening of cotter, a small set screw is used through the rod jamming against the cotter. Jun 03, 2017 a cotter joint b bolted joint c kunckle joint d universal coupling e gib and cotter joint. Rods may be of different cross sections like circular or square. Cotter and knuckle joints understanding engineers gallery. Autocad mechanical practice drawings pdf free download autocad exercise book. Aug 31, 2014 a cotter joint b bolted joint c kunckle joint d universal coupling e gib and cotter joint. The computeraided design cad files and all associated content posted to this website are created, uploaded, managed and owned by third party users. Sleeve and cotter joint is a type of joint used to typically connect two similar coaxial cylindrical rods. Gib and cotter joint creo part design and assembly. The use of gib and cotter enables the parallel holes to be used. This joint is used to join two rods of square or rectangular in cross section.
All components of the joint are assumed to be of the same material. Consider a gib and cotter joint for strap end or big end of a connecting rod as shown in fig. Most mechanical joints are designed to allow relative movement of these mechanical parts of the machine in one degree of freedom, and restrict. In this article, i am going to publish the detailed design procedure for knuckle joint. Chapter 4f design of socket and spigot cotter joint. Design of socket and spigot cotter joint part number name of part 1 shaft or rod 2 socket 3 spigot 4 cotter 5 socket collar 6 spigot collar mr. Match list i with list ii and select the correct answer using the code given below. In a sleeve and cotter joint, the cut slots are always made a little bit wider than the width of the cotters in order to promote wedging action of the cotters over the slots. Chapter 7 cotter and knuckle joints machine design. When two jibs are used, the cotter with both sides tapered is provided. Cotter joint is widely used to connect the piston rod and crosshead of a steam engine, as a joint between the piston rod and the tailor pump rod, foundation bolt etc.
Knuckle joint only sectional front view is in our syllabus. After the design of cotter joint, the modeling of cotter joint is done by using catia v5r20. When there is a requirement of a small amount of flexibility or angular moment, knuckle joint is used. Each cad and any associated text, image or data is in no way sponsored by or affiliated with any company, organization or realworld item, product, or good it may purport to portray. Machine designi 19 cotter joint a cotter joint is a temporary fastening and is used to connect rigidly two coaxial rods or bars which are subjected to axial tensile or compressive forces and not in rotation. Some of the parts are a bit more challenging than others, but none of them are meant to be difficult. Split nut is a locking device in which a one smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming b a slot is cut partly in middle of nut and then slot reduced. A cotter is a flat wedgeshaped piece of steel which is used to connect rigidly two rods which transmit motion in the axial direction tensile or compressive forces without rotation. Cotter joint a cotter joint is used to connect rigidly two coaxial rods or bars which are subjected to axial tensile or compressive forces.
Permissible shear stress for the cotter material, and. In order to find out various dimensions of the parts of a cotter joint, failures in different parts and at different xsections are considered. Design of cotter joint bending strength of materials. See all design to learn to design and assemble the parts in diff ways and methods. Cotter joint has mainly three components spigot, socket and cotter as shown in figure 9. Mechanical joints may be temporary or permanent, most types are designed to be disassembled. The shear plane in case of bolts should a be across. Rods, having axial tensile or compressive forces are connected by cotter joints. Gib is likely a cotter but with two gib heads at its ends.
It is not used for connecting shafts that rotate and transmit torque. The gib increases the tearing area of the cotter and prevents slackening of the joint besides holding the jaws of the strap or fork from opening wide when the cotter is inserted. The end of one rod is forged in the from of a fork or strap. Gib and cotter joint and its design engineers gallery. Gib and cotter joint design procedure for the spigot and cotter joint. Design of cotter joint free download as powerpoint presentation. The material used is carbo n steel fo r which the fo llow ing a llowable s tresses.
A gib and cotter joint is usually used in strap end or big end of a connecting rod. 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. Types of cotter joint there are three types 1 socket and spigot cotter joint 2 sleeve cotter joint 3 gib cotter joint. Anuj gupta introduction a cotter joint is a temporary fastening and is used to connect rigidly two coaxial rods or bars which are subjected to axial tensile or compressive forces. A backing ring is used inside the pipe joint when making a a butt weld b fillet weld c sleeve weld d socket weld e tube weld. Autocad mechanical practice drawings pdf free download. Gib and cotter joint for strap end of a connecting rod. Design of cotter joint problems design of socket and. What are the practical application of cotter joint. Design an d draw a cotter joint to support a load varying from 30 n in compression to 30 kn in tension.
Design of gib and cotter joint for strap end of a connecting. A mechanical joint is a section of a machine which is used to connect one or more mechanical part to another. Gib and cotter joint autodesk inventor part design and. Design of gib and cotter joint for square rods design of a gib and cotter joint for strap end of a connecting rod. This joint is useful to fasten connecting rod of a steam engine or marine engine. A textbook of machine design khurmi gupta bdd uthm studocu. It contains a sleeve and two wedge shaped tapered cotters. Sleeve cotter joint pdf the working of the cotter and sleeve and cotter and gib are shown below.
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