Chapter 7 cotter and knuckle joints machine design. Gib is like a cotter but with two gibgib is like a cotter but with two gib heads at its ends. Cotter joint a cotter joint is used to connect rigidly two coaxial rods or bars which are subjected to axial tensile or compressive forces. This cotter joint is also used to connect circular rods.
These joints are not suitable where the members are under rotation. Socket and spigot cotter joint sleeve and cotter joint. When two jibs are used, the cotter with both sides tapered is provided. A gib and cotter joint is usually used in strap end or big end of a connecting rod as shown in fig. Or they could have a bivariate joint gaussian pdf, or something in between as henning makholm points out. Two random variables x and y are jointly continuous if there exists a nonnegative function fxy. What are the applications of sleeve and cotter joint answers. A cotter joint is a temporary fastening and is used to connect rigidly to coaxial shafts which are subjected to axial tensile or compressive forces. 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. Cotter joint is used to connect two rods subjected to axial tensile or compressive loads. To make the joint, one end of the rod is formed into a ufork, into which, the end of the other rod fits in.
The computeraided design cad files and all associated content posted to this website are created, uploaded, managed and owned by third party users. A joint in timber construction, formed with a steel strap tightly drawn in position by steel clips and wedges explanation of gib andcotter joint. See, a cotter joint can be used anywhere you require two shafts of circular. Cotter joint is used to connect two rods or components which are subjected to tension or compression. Joint pdf calculation example 1 consider random variables x,y with pdf fx,y such that fx. 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. While connecting two rods the gib is inserted first and pushed towards the end of the fork and then the cotter is hammered. 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. 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. What is a cotter joints a cotter is a flag wedge shaped piece of steel. The following are some of the commonly used cotter joints. One end of the rod is forged in the shape of a fork refer fig 22.
Cotter joints, socket and spigot joint, sleeve and cotter joint gib and cotter joint, knuckle joint. Keys, cotter and unit 5 key, cotter and knuckle knuckle. For the love of physics walter lewin may 16, 2011 duration. 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. Instructions the parts and assembly of the cotter joint is.
The ends of the two rods are inserted from opposite sides in a. A cotter joint is a simple and compact connection and is easily assembled and disassembled. Clearances are absolutely required for proper functioning of the joint. The cotter comes in contact with the two rods on opposite sides and leaves clearances on both sides. 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 compressive forces along their axes. Cotter joint cotter and knuckle joints are fasteners used to connect two roads transmitting axial force. Failure of cotter joint may causes accident, so it is necessary to design cotter. A mechanical joint is a section of a machine which is used to connect one or more mechanical part to another. The following are the three commonly used cotter joints types. It is not suitable to connect rotating shafts which transmit torque. Here instead of a socket arrangement, a sleeve is used.
Strap is placed either on one side or on both sides of the main plates. Gib and cotter joint and its design engineers gallery. A lap joint is that in which one plate overlaps the other and the two plates are then riveted together. The subject of this project is the modeling and analysis of cotter joint. Match list i items in joints with list ii type of failure and select the correct. Figure 2 shows the assembly of a gib and cotter joint. The low chamfer angle of the wedge assures tightness of the joint and provides selfbraking, which prevents the wedge from falling out.
A butt joint is that in which the main plates are touching each other and a cover plate i. The end of one rod is forged in the from of a fork or strap. Mainly it is used to connect two rods which are not rotationg and which carry tensile as well as compressive load. Design a socket and spigot cotter joint to connect two steel rods of equal diameter. Mechanical joints may be temporary or permanent, most types are designed to be disassembled. Gib is likely a cotter but with two gib heads at its ends. The factor of safety for rods, spigot end and socket end is assumed as 6 while for cotter.
Cotter joint a detachable joint that is fastened or adjusted by a wedge. This joint is used to join two rods of square or rectangular in cross section. There is no relative angular movement between rods. Ppt cotter joint powerpoint presentation free to view. In the above definition, the domain of fxyx,y is the entire r2. This joint has better strength compared to the socket and spigot cotter joint.
This is the simplest of all cotter joints, used for fastening two circular rods. After keeping the rods butt against each other, a sleeve with slots is placed over them. Gib and cotter joints are used for rods of square or rectangular cross section. In knuckle joint the two views of which are shown in fig. A cotter is a flat wedgedshape piece of rectangular crosssection and its width is tapered from one end to another for an easy adjustment. 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. To make the joint, the rods are enlarged at their ends and slots are cut. Use onensks cotter ors sleeve and cotter joints questsm. The cotter is usually made of mild steel or wrought iron. 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. A gib is used along with the cotter to make this joint. The working of the cotterandsleeve and cotterand gib are shown below. This is the simplest form of cotter joint used for fastening the two circular rods. Gibandcotter joint article about gibandcotter joint.
Material of two rods and cotter is steel 30 c8 s yt 400nmm2, s yc 2 s yt and s sy 0. This type of joint is used for joining two square rods. A key is employed to connect two pieces, like shaft and a gear, in such a way. The gib has projections at the top and bottom ends which act like hooks. However, if we assume a triangular pressure distribution over the rod, as shown in. Sometimes to prevent loosening of cotter, a small set screw is. 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. There are a three types of cotter joint 1 socket and spigot cotter joint 2 sleeve and cotter joint 3 gib and cotter joint. Gib andcotter joint article about gib andcotter joint by the free dictionary.
Slots are provided in the fork and the rod t o accommodate the gib and cotter. What are the practical application of cotter joint. Cotter joint article about cotter joint by the free. It is also used to connect a rod on one side with some machine part like a crosshead or base plate on the. Each rod is subjected to an axial tensile force of 50 kn. Cotter joint is widely used to connect the piston rod and crosshead of a steam. Cotter joint is widely used to connect the piston rod and cross head of the. In fact, the joint pdf given there is zero in the second and fourth quadrants. Cotterjoints and pin joints are used for rods in tensile or compressive load. Joint probability density function joint continuity pdf. A free powerpoint ppt presentation displayed as a flash slide show on id. Following are the some of the applications of cotter joint. 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 used to connect two coaxial rods, which are subjected to either axial tensile force or axial compressive force.
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