Joints between the piston rod and the cross need of the steam engine. 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. Explain the design process for spigot and socket cotter joint with neat sketch. Design of socket and spigot cotter joint p tensile force acting on rods n d diameter of each rod mm d 1 outside diameter of socket mm d 2 diameter of spigot or inside diameter of socket mm d 3 diameter of spigot collar mm d 4 diameter of socket collar mm a distance from end of slot to the end of spigot on rodb mm b mean width of cotter mm. Cotter joint has mainly three components spigot, socket and cotter as shown in figure 9.
Cotter joint is used to connect two rods subjected to axial tensile or. The compressive load is taken up by the collar on the spigot. Two joints one between plates and other between rods can be easily understood as. Types of cotter joint there are three types 1 socket and spigot cotter joint 2 sleeve cotter joint. Apr 30, 2020 a cotter joint or a cotter, basically a wedge shaped piece made of steel plate. The socket and the spigot are provided with a narrow rectangular slot. Muttagi, slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. The end of the rod which goes into a socket is also called spigot. Design of socket and spigot cotter joint free download as word doc.
To understand the design steps let take a question and solve it step by step. A rectangular hole is made in the socket and spigot. The slots in the socket and the spigot align so that a cotter can be inserted to lock the two rods together. The assembly consists of inserting the spigot end into the socket end and putting the cotter into their common slot. The socket and spigot cotter joint is shown in fig. Failure of spigot in tension across the weakest section. Socket and spigot cotter joint in a socket and spigot cotter joint, one end of the rods say a is provided with a socket type of end as shown in fig. The socket and spigot cotter joint is shown in fig 2. Design a socket and spigot cotter joint to connect two steel rods of equal diameter.
Keys, cotter and unit 5 key, cotter and knuckle knuckle. The spigot is the male part of the cotter joint which has also a rectangular slot on its surface such that the cotter can pass through it. Spigot and socket joint cotter joint rods, having axial tensile or compressive forces are connected by cotter joints. Spigot and socket joint pipes are joined and sealed using either a rolling rubber or a sliding rubber ring respectively. 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. Design procedure the dimensions for a socket and spigot cotter joint may be obtained by considering the various modes of failure 1 failure of the rod in tension the rod may fail in. Design the joint for an axial load of 100 kn which alternately changes from tensile to compressive. The two rods and the cotter is selected as plain carbon steel of grade 30c8 s, 400 nm2.
The spigot is inserted into the socket such that the rectangular slots of both spigot and socket can meet with each other and then the cotter. The allowable stresses for the material used are 50 mpa in tension, 40 mpa in shear and 100 mpa in crushing. It consist of 1 spigot 2 socket cotter application. Material of two rods and cotter is steel 30 c8 s yt 400nmm2, s yc 2 s yt and s sy 0. Spigot fits inside the socket and the cotter is passed through. Socket and spigot cotter joint the socket and spigot cotter joint is shown in fig. Following are the three commonly used cotter joints to connect two rods by a cotter. Construction of a cotter joint used to join two rods a and b as shown below.
Spigot is formed on one of the rods and socket is formed on the other. Compressive stress p socket dia spigot diathickness. Dec 21, 2017 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. Pdf machine elementsi lecture notes meen322 handout to.
Design of cotter joint tap valve bending free 30day. Design of spigot and socket cotter let p load carried by the rods, d diameter of the rods, d1 outside diameter of socket, d2 diameter of spigot or inside diameter of socket, d3 outside diameter of spigot collar, t1 thickness of spigot collar, d4 diameter of socket collar, c thickness of socket collar, b mean width of cotter, t thickness of cotter, l length of cotter, a distance from the end of the slot to the end of rod. Ther are two reasons for assuming a lower fos for the cotter. Design procedure the dimensions for a socket and spigot cotter joint may be obtained by considering the various modes of failure 1 failure of the rod in tension the rod may fail in tension due to the tensile load p. Cotter the taper of usually 1 in 24 is provided for following two taper side reasons.
Each rod is subjected to an axial tensile force of 60 kn. Saravanakumar, ap let p load carried by the rods, d diameter of the rods, d1 outside diameter of socket, d2 diameter of spigot or inside diameter of socket, d3 outside diameter of spigot collar, t1 thicknessof spigotcollar, d4 diameter of socketcollar, cthicknessof socket collar, b mean width of cotter, t thicknessofcotter, l length of cotter, a distance from the end of the slot to the end of rod. Spigot has a collar which rests against the socket end. Socket and spigot cotter joint solid works part design. One rod is fitted with a spigot, which fits inside a socket at the end of the other rod. State the different applications of the cotter joint. 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.
The design of these types of joints are discussed, in detail, in the following pages. Let p load carried by the rods, d diameter of the rods, d 1 outside diameter of socket, d 2 diameter of spigot or inside diameter of socket, d 3 outside diameter of spigot collar, t 1 thickness of spigot collar, d. Design of cotter joint problemsdesign of socket and. Saravanakumar, ap acotter joint isusedto connect rigidly two coaxialrods or bars which are subjected to axial tensile or compressive forces. 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. The cotter made of steel 30c8 s yt 400 nmm 2 and the factor of safety f. A cotter is then driven tightly through a hole in order to make the temporary connection between the two rods. Design of cotter joint a cotter is a rectangular element. Mar 06, 2020 a cotter joint, also known as a socket and spigot joint, is a method of temporarily joining two coaxial rods. Gib and cotter joint socket and spigot cotter joint.
The load is usually acting axially, but it changes its direction and hence the cotter joint must be designed to carry both the tensile and compressive loads. Aim design and drawing of cotter joint function a cotter joint is. The assembly and dismantling of parts of the cotter joint is quick and simple. Cotter joint a cotter joint is used to connect rigidly two coaxial rods or bars. Inside diameter of the socket joint and outer diameter of the socket collar are 50 and 100 mm respectively. Cotter joints can be quickly assembled as well as disassembled.
Cotter joint has mainly three components spigot, socket and cotter as shown in figure 2. This is used to connect rigidly two rods which transmit motion in the axial direction, without rotation. On the basis of strength, the material of the two rods and the cotter is selected as plain carbon steel of grade 30c8 syt400mpa step 2. Design a spigot and socket type cotter joint to transmit. This video explains design procedure of socket and spigot type of the cotter joint. A knuckle joint is used to connect two rods that are under a tensile load. The factor of safety for rods, spigot end and socket end.
Cotter joint piston tension physics free 30day trial. Design of cotter joint problemsdesign of socket and spigot. 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 without rotation. This joint gets tightened and adjusted by means of cotter s wedge action. Design procedure of cotter joint, socket and spigot joint. May 09, 2017 cotter joint a cotter joint is used to connect rigidly two coaxial rods or bars which are subjected to axial tensile or compressive forces.
It is required to design a cotter joint shown in figure 1 to connect two steel rods of equal diameter. Cotter joint has mainly three components spigot, socket and cotter as. Types of cotter joints following are the three commonly used cotter joints to connect two rods by a cotter. Cotter joint the cotter joint offers the following advantages. The two views of sleeve cotter joint are drawn in figure 5. Design of cotter joint bending strength of materials.
Design procedure of cotter joint, socket and spigot joint design. Gib and cotter joint socket and spigot cotter joint p load carried by the rods, d diameter of the rods, d 1 outside diameter of socket, d 2 diameter of spigot or inside diameter of socket, d 3 outside diameter of spigot collar, t 1 thickness of spigot collar, d 4 diameter of socket collar, c thickness of socket collar, b mean width of cotter, t thickness of cotter, i length of cotter, a distance from. It is required to design a cotter joint to connect two steel rods of equal diameter. Design procedure of socket and spigot cotter joint, cotter. These joints may be subjected to tensile or compressive.
It is the female part of the joint, it also has a rectangular slot for passing the cotter through it. Problem 3 two rod ends of a pump are joined by means of a cotter and spigot and socket at the ends. Spigot fits inside the socket and the cotter is passed through both the socket and the spigot. The various design equations for cotter joints design were put. Socket and spigot cotter joint and its design engineers. Rods may be of different cross sections like circular or square. Design of socket and spigot joint bending mechanics. When the cotter is hammered, the rods are drawn together and tightened. The design of these types of joints are discussed, in detail. The spigot is inserted into the socket such that the rectangular slots of both spigot and socket can meet with each other and then the cotter pin is inserted into it for fixing it firmly. Thickness of plate is required more in welding than in riveting. Cotter joint can be used to connect two rods for torque transmission purpose. Design a socket and spigot type cotter joint to sustain an axial load of 100 kn. The permissible stresses for the rods, spigot end and socket end are.
Mohammad afazal, university polytechnic, jmi, new delhi 110025 university polytechnic mechanical engineering section mohammad afazal, university polytechnic, jmi, new delhi 110025 cotter joint. Failure of spigot in tension across the weakest section or slot. Let p load carried by the rods, d diameter of the rods, d1 outside diameter of socket, d2 diameter of spigot or inside diameter of socket. 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 des. In a socket and spigot cotter joints, one end of the rods is provided with a socket type of end and the other end of the rod is inserted into a socket the end of the rod which goes in to a. These joints may be subjected to tensile or compressive forces along the axes of the rods. Design procedure of socket and spigot cotter joint, cotter joint design procedure, machine designlink design of machine element video. Design a cotter joint subjected to a tensile load of 35 kn and a compressive load of 40 kn.
The computeraided design cad files and all associated content posted to this website are created, uploaded, managed and owned by third party users. Cotter is used to connect rigidly two rods which transmit motion in the axial direction. The internal diameter of the sleeve match with the external diameter of the rod and the slot matches with the cotter. It is required to design a cotter joint shown in f. Each rod is subjected to an axial tensile force of. Design of socket and spigot cotter joint bending strength of. The fos for the rods, spigot end and socket end is assumed as 6, while for cotter, it is 4. Each rod is subjected to an axial tensile force of 50 kn. Design of machine membersi f the usual proportions of the gib. Gib and cotter joint socket and spigot cotter joint p load carried by the rods, d diameter of the rods, d 1 outside diameter of socket, d 2 diameter of spigot or inside diameter of socket, d 3 outside diameter of spigot collar, t 1 thickness of spigot collar, d 4 diameter of socket collar, c thickness of socket collar, b mean width of cotter, t thickness of cotter, i length of cotter, a distance from the end of the slot to the end of rod, t permissible tensile. Apr 30, 2020 numericals on the design of cotter joint. Cotter joint is never used to connect two rods for torque transmission purpose. The material selected for the joint has the following design stresses 80 mpa in tension, 60 mpa in shear and 150 mpa in compression.
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