Analysis Of Knuckle Joint

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Meshing of knuckle joint Figure 8.1 meshing of knuckle joint

8.2 Constraints applied on knuckle joint for analysis Figure 8.2 constraints applied on knuckle joint

After studying knuckle joint used in tractor-trailer then after making design and analysis of knuckle joint for stresses and deflection the following conclusions can be drawn:

From the above results and discussion, Knuckle joint was design for 52860 N axial load by theoretical calculation.

From theoretical calculation we applied that load for analysis in NX CAD software and we obtained result for steel and cast iron G25 materials and results are shown in figures.
CHAPTER: 2 TYPES OF MECHANICAL JOINT Normally, Mechanical joints are
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2.1 Temporary (detachable) joint:

2.1.1. Knuckle joint
A knuckle joint is used to connect the two rods which are under the Tensile load, when there is requirement of small amount of flexibility or Angular moment is necessary. There is always axial or linear line of action of load. Figure 2.1 Knuckle joint
The knuckle joint assembly consists of following major components:
1. Single eye.
2. Double eye or fork.
3. Knuckle pin.
4. Collar. And
5. Tapper pin.

At one end of the rod the single eye is formed and double eye is formed at the other end of the rod. Both, single and double eye are connected by a pin inserted through eye. The pin has a head at one end and at other end there is a taper pin or split pin. For gripping purpose the ends of the rod are of octagonal forms. Now, when the two eyes are pulled apart, the pin holds them together .The solid rod portion of the joint in this case is much stronger than the portion through which the pin passes.

The modes of failure are:
1. Shear failure of pin (single
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Cotter joint
A cotter is a pin or wedge passing through a hole to fix parts tightly together. In British usage cotter pin has the same meaning, but in the U.S. it refers to a different fastener. Typical applications are in fixing a crank to its crankshaft, as in a bicycle, or a piston rod to a crosshead, as in a steam engine. Note: the angle of the wedge determines the position of the parts being held, therefore on a bicycle the pedal arms will only be at 180 degrees to each other if the angle of the cotter pin's wedge is the same on both pins. Popular usage

Formerly, it was common to mount bicycle cranks using a cotter, though now usually a more easily maintained arrangement is used such as a square tapered or splined interface. These cotters have a short threaded section at the narrower end of the taper, which is used to hold the cotter in place with a washer and nut.

2.1.4. Revolute Joint

A revolute joint (also called pin joint or hinge joint) is a one-degree-of freedom kinematic pair used in mechanisms. Revolute joints provide single-axis rotation function used in many places such as door hinges, folding mechanisms, and other uni-axial rotation

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