The cotter is usually made of mild steel or wrought iron. 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. With autodesk gallery, you can view and present 3d model and file easily online. In order to design the cotter joint and find out the dimensions, failures in different parts and at different crosssections are considered. Knuckle joint is used to connect two rods subjected to axial tensile loads. Design procedure of cotter joint, socket and spigot joint design. Design cotter joint free download as powerpoint presentation. Chapter 7 cotter and knuckle joints machine design. The maximum permissible stresses are 55 mpa in tension. Design of various types of riveted joints under different static loading conditions, eccentrically loaded riveted joints.
It is not suitable to connect rotating shafts which transmit torque. Autocad mechanical practice drawings pdf free download autocad exercise book. Sleeve and cotter joint and its design engineers gallery. Mechanical joints may be temporary or permanent, most types are designed to be disassembled. Joint between piston rod and crosshead of steam engine 2. 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. 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. 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. Apr 29, 2020 chapter 7 cotter and knuckle joints machine design, mechanical engineering mechanical engineering notes edurev is made by best teachers of mechanical engineering. Our single packs will be sufficient for 1 bear 5 joints our 10 joint packs will be sufficient for two bears our. 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.
After the design of cotter joint, the modeling of cotter joint is done by using 3d software. In order to find out various dimensions of the parts of a cotter joint, failures in different parts and at different xsections are considered. 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. As seen in the assembly the knuckle joint has main four parts. Cotter is flat wedge shape piece of rectangular cs and width is tapered either one side or both side from one end to another for an easy adjustment. 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. All the parts of the joint are made of the same material with the permissible stresses, 55 mpa in tension, 70 mpa compression and 40 mpa in shear. Following are the three commonly used cotter joints to connect two rods by a cotter.
Cotter joint is used to connect two rods or components which are subjected to tension or compression. Axes of the shafts to be joined should lie in the same plane and may coincide or intersect. Mohair bear making supplies limited cotter t pin joints. If the allowable stresses in tension, compression and shear for the socket, rod and cotter be t. These machine design1 quick revision notes will help you prepare on the exam day and score good marks. It is not at all suitable to connect rotating shafts which transmit torque. Free body diagram of forces acting on three components of the cotter joint socket, cotter and spigot are shown in figure 9. 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. Autocad mechanical practice drawings pdf free download. Before going into detailed steps to design the dimensions of the knuckle joint, it is essential to get oriented with all its components and their functions. Jan, 2017 in this article,design procedure for knuckle joint and cotter joint were explained in a detailed manner with the help of videos. A knuckle joint design procedure before going into detailed steps to design the dimensions of the knuckle joint, it is essential to get oriented with all its components and their functions. Hello mechanical engineering students, i am sharing the machine design1 pdf class lecture notes, ebook, book as per the mechanical engineering second year course syllabus.
Here is the diagram showing the exploded view of knuckle 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. The function of rivets in a joint is to make a connection that. The computeraided design cad files and all associated content posted to this website are created. A mechanical joint is a section of a machine which is used to connect one or more mechanical part to another. A design procedure of cotter joint cotter joint introduction before going into detailed steps to design and find dimensions of cotter joint, it is necessary to understand clearly the various components, their functions and assembly of cotter joint. In this project we use theoretical method for finding dimensions of cotter joint.
In cotter joint clearance is also provided between cotter and slots to allow driven cotter to draw two parts together cotter is tapered a to withstand back movement due to impact load b due to taper shape, it is easy to remove cotter and dismantle the joint c. Design a cotter joint of socket and spigot type, which may be subjected to a pill or push of 30 kn. It may also be used to support the compressive load if the joint is guided. Take ultimate shear stress half that of ultimate tensile stress and ultimate crushing stress double that of ultimate tensile stress.
The taper varies from 1 in 48 to 1 in 24 and it may be increased to 1 in 8 if locking is provided. Cotter joint a cotter joint is used to connect rigidly two coaxial rods or bars which are subjected to axial tensile or compressive forces. The official platform from autodesk for designers and engineers to share and download 3d models, rendering pictures, cad files, cad model and other related materials. 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. Some of the parts are a bit more challenging than others, but none of them are meant to be difficult.
Cotter joint is used to connect two rods subjected to compressive or axial tensile loads. 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. Video lecture on design procedure of cotter joint, socket and spigot joint from design of cotter joint, knuckle joint,levers and offset links. Department of mechanical engineering, spit piludara. 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. Design of cotter joint bending strength of materials. After modeling on catia, we will analyze cotter joint on software named as ansys v15. An approach to design of cotter joint using genetic. What is a cotter joints a cotter is a flag wedge shaped piece of steel.
Very high tightening force due to wedge action, which prevents loosening of parts in service. 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. Joints between the piston rod and the cross need of the steam engine. The end of the rod which goes into a socket is also called spigot. The computeraided design cad files and all associated content posted to this website are created, uploaded, managed and owned by third party users. Cotter joint uses one or two cotters to connect two rods rigidly transmitting forces and motion, with no rotation of the rods 3.
What are the practical application of cotter joint. Chapter 4edesign of rivets for eccentrically loaded joints. This document is highly rated by mechanical engineering students and has been viewed 1586 times. Design procedure for sleeve and cotter joint the career. Design of cotter joint free download as powerpoint presentation. Design of cotter joint socket and spigot joint it is used to connect two coaxial rods under the action of axial tensile or compressive loads. Cotter joint is used to connect two rods subjected to axial tensile or compressive loads.
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