Cotter and knuckle joints understanding engineers gallery. Draw the necessary views connecting the shaft with. Cotter joint has mainly three components spigot, socket and cotter as shown in. Design a knuckle joint to connect two circular mild steel rods which are subjected to. During reassembly, insert a new cotter pin into the ball joint pin hole from the front to the rear. Cotter joint is used when the members are subjected to. As the name suggests, a temporary joint allow easy and quick disassembly of joined components without breaking them. The design of these types of joints are discussed, in detail, in the. Keys, cotter and unit 5 key, cotter and knuckle knuckle. Other than welding, rivet joint and adhesive joint are also permanent joining processes.
Design a knuckle joint to connect two circular mild steel rods which are subjected to a tensile load of 63kn. Jan 09, 2020 a cotter joint, also known as a socket and spigot joint, is a method of temporarily joining two coaxial rods. Distinguish between cotter joint and knuckle joint. Knuckel joint is designed to allow certain motion or angle between two shafts even if they are in action, whereas cotter joit is design to facilitate the aligned shafts. It is usually used in connecting a piston rod to the cross head of a reciprocating steam engine, a piston rod and its extension as a tail or pump rod, strap end of connecting rod. There is always axial or linear line of action of load. Cotter joint for mechanical engineering helps you for every mechanical engineering entrance exam. It is not suitable to connect rotating shafts which transmit torque. Use a puller tool to free the joint then set the knuckle aside. Jan 24, 2021 it is required to design a knuckle joint as shown in fig. Pitch is the distance between two similar points on threads measured.
The knuckle joint assembly consists of the following major components. Design of cotter joint, knuckle joint, levers and offset. Levelii 10 differentiate between a cotter and knuckle joint. A mechanical joint is a section of a machine which is used to connect one or more mechanical part to another. Among temporary joining processes, fasteners, cotter joint, knuckle joints, etc. A gib is used along with the cotter to make this joint. It is also used to connect a rod on one side with some machine part like a crosshead or base plate on the. Following are the three commonly used cotter joints to connect two rods by a cotter.
Pitch is the distance between two similar points on threads measured parallel to the axis of the. Unit 2 design of temporary design of temporary connections. This joint also consists of three parts two rods and pin. Which of the following is a temporary and permanent joint. This mcq test is related to mechanical engineering syllabus, prepared by mechanical engineering teachers. Remove the cotter pin from the knuckle ball joint, then remove the castle nut. The cotter comes in contact with the two rods on opposite sides and leaves clearances on both sides. Applications of knuckle joint in different machines. More information the design procedure for knuckle joint was explained in this article. Practice the drawing methods for sectioning of joints, couplings, bearings, keys. They are a spherical bearing in a socket functioning similarly to the ball and socket design of a human hip and serve as one of the main suspension pivot points connecting the control arms of the vehicle to the steering knuckles.
Gib is likely a cotter but with two gib heads at its ends. Knuckle joint consists of two forks, one attached to tractor and other attached to trailer, both the forks are connected together using pin. The ends of the two rods are inserted from opposite sides in a. Knuckle joint is yet another to join rods to carry axial force.
Jun 22, 2019 1 this joint cannot withstand large compressive loads. If in good condition, the seal can be reused in the new superlift knuckle. Remove the lca ball joint cotter pin and castellated nut. Non of them are permanent joints how could they be. Describe the design procedure of a gib and cotter joint. To create the knuckle joint assembly as a 3d solid model using catia v5 software. The design of these types of joints are discussed, in detail, in the following pages. As a adjective joint is done by two or more people or organisations working together.
One rod is fitted with a spigot, which fits inside a socket on one end of the other rod. This test is rated positive by 85% students preparing for mechanical engineering. Arragement of public open space of palu riverbanks in palu city center area. Such joints are permanent in nature and cannot be dismantled without breaking assembled parts. A cotter joint is temporary joint and used to connect two coaxial rods or bars which are subjected to axial tensile and or compressive forces. These joints are used for different types of connections e. 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 socket end comes in contact with the cotter on the rod end. Cotter and knuckle joints are fasteners used to connect two roads transmitting axial force. Leveli 11 design a spigot and socket joint to connect two rods of 30c8 steel to carry an axial. Knuckle joint is used to connect two rods subjected to axial tensile loads.
As nouns the difference between joint and knuckle is that joint is the point where two components of a structure join, but are still able to rotate while knuckle is any of the joints between the phalanges of the fingers. 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. The knuckle is now held only by the lower ball joint. Analysis of knuckle joint of various materials using cae tools. What is a cotter joints a cotter is a flag wedge shaped piece of steel. 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. Cotter joints are used to connect two rods, subjected to tensile or. Solved difference between universal joint and knuckle. The design of cotterjoint, knuckle joint, levers and offset links is a chapter from the design of machinedom subject. A knuckle joint is a mechanical joint used to connect two rods which are under a tensile load, when there is a requirement of small amount of flexibility, or angular moment is necessary. 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. This contains 10 multiple choice questions for mechanical engineering test.
Cotter joint is used to connect two rods subjected to axial tensile or compressive loads. It may also be used to support the compressive load if the joint is guided. It permits some angular movement between the cylindrical rods in their plane. Diameter and spiral thickness optimization of knuckle. This joint permits angular misalignment of the rods and may take compressive load if it is guided. Disconnect the tierod end ball joint from the knuckle using the ball joint thread protector and the ball joint remover.
Pros and cons of welded joint are discussed in the following. Contents 1 pin joint 2 prismatic joint 3 ball joint 4 knuckle joint 5 turnbuckle 6 cotter joint 7 bolted joint 8 screw joint. Sketch two views of a knuckle joint and write the equations showing the strength of joint for the mostprobable modes of failure. What is difference between knuckle joint and cotter joint. It is usually used in connecting a piston rod to the cross head of a reciprocating steam engine. Take care not to damage the seal which is pressfitted into the back side of the knuckle. The term coalescence literally means a process of merging two or more droplets or particles to form a large one.
The cotter can pass through two specially made ends of two coaxial bars which may be circular in. The rods are coaxial and a small amount of angular movement between their axes is permissible. Introduction knuckle joint is a type of mechanical joint used in structures, to connect two intersecting cylindrical rods, whose axes lie on the same plane. Torsional shear stress induced at the outer surface of the shaft or maximum shear stress, nmm2 r radius of the shaft, mm t torque or twisting moment, nmm j second moment of area of the section about its polar axis or polar moment of inertia, mm4 c modulus of rigidity for the shaft material, nmm2. A colour monitor with highest 32 bit colour display and with screen resolution 1024 by 768 pixels. Differentiate between knuckle joint and cotter joint. Within the machine the power from the main shaft is transmitted to the other 2.
Difference between temporary joining and permanent joining. Set the joint in a roasting tin and roast for the calculated cooking time. Question for cotter and knuckle joint 1 free download as word. It is a kind of hinged joint between two rods, often like a ball and socket joint. It is usually used in connecting a piston rod to the cross. Clearances between the cotter and slots in the rod end and socket allows the driven cotter to.
This is the simplest form of cotter joint used for fastening the two circular rods. The cotter passes through slots made in two coaxial parts and thus prevent the relative motion between them. 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. These joints may be subjected to tensile or compressive forces along the axes of the rods. Cotter joint machine design questions and answers sanfoundry. This is used to connect rigidly two rods which transmit motion in the axial direction, without rotation. Cotter joint 10 questions mcq test has questions of mechanical engineering preparation.
Gtu paper analysis new syllabus chapter 1 design against. Mechanical joints may be temporary or permanent, most types are designed to be disassembled. Cotter joint mcq to study with solutions a complete question bank. The cotter used within a cotter joint is typically an elongated wedge, which can be driven into the slots. Cotter joint uses one or two cotters to connect two rods rigidly transmitting forces and motion, with no rotation of the rods 3.
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. Knuckle joint which is practically used to join two bars being pulled apart is similarly a temporary joint. After most railroads converted to semiautomatic janney couplers, the linkandpin survived on forest railways. While simple in principle, the system suffered from a lack of standardisation regarding size and height of the links, and the size and height of the pockets. Clearances are absolutely required for proper functioning of the joint. The cotter is usually made of mild steel or wrought iron. Jan, 2017 in this article, i will discuss on the design procedure for knuckle joint and cotter joint, and at the end of the article, you can download the pdf copy also. A cotter joint is used to connect two coaxial rods, which are subjected to either axial tensile force or axial compressive force. Cotter joint cotter and knuckle joints are fasteners used to connect two roads transmitting axial force. 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. As verbs the difference between joint and knuckle is that joint is to unite by a joint or joints.
Despite presence of many alternative processes, welding offers many advantages over others. The rods connected by this joint are subjected to tensile loads, although if the rods are guided, they may support. The knuckle joint is a type of mechanical joint which is used to connect two rods or bars when a small amount of flexibility or angular moment is necessary. Sep 03, 2016 joint between the piston rod and the tail and pump rod foundation bolt 8. It is also used to connect a rod on one side with some machine part like a crosshead or base plate on the other side. The allowable limits of tensile, shear and crushing strength are 60 nmm2, 40 nmm2 and 75 nmm2. Cotter and knuckle joint part 1 mechanical engineering. Knuckle joints parts and functions mechanical walkins. Ball joints are an important suspension component found on virtually all modern vehicles. A knuckle join t is used to conn ect two rods which are unde r the action of tensile loads. Unit 5 key, cotter and knuckle joints dpg polytechnic.
It is named so because of its freedom to move or rotate around the pin which joins two rods, a motion which naturally exists at finger joints or knee. Ch12 contents contents cotter and knuckle joints c h a. Both of them have their own application on requirements cttor joint is appleid where rigiid motion has to be transmitted with tensilecompression and axial force it has provide flat head dual. 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 knuckle joint is used to connect two rods under tensile load. During transportation variable stresses act on knuckle joint which causes failure of joint. However, if however, if the joint is guided, the rods may support a compressive load. Cotter joint with a gib gib and cotter joints are used for rods of square or rectangular cross section. The dovetail joint, while more difficult to make, is also quite strong. Knuckle joint definition, a joint forming a knuckle. It consist of 1 spigot 2 socket cotter application. A cotter is a flat wedgeshaped piece of steel as shown in figure. Design a cotter joint to connect two mild steel rods.
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