Universal Joint

Introduction

A universal joint is a mechanical device that allows one or more rotating shafts to be linked together, allowing the transmission of torque and/or rotary motion. It also allows for transmission of power between two points that are not in line with each other.
Universal joints come in a wide variety of shapes, sizes and configurations to accommodate the infinite amount of applications they can go into. You should always consult a professional before selecting a universal joint.

Parts of a Universal Joint:

The simplest type is known as the Cardan joint or Hooke joint, shown in the figure below.fig1_joints
The joint consists of two yokes, one on each shaft that is connected by a cross-shaped member called the spider. The constant angle between the two shafts is known as the operating angle, although it can also change. Good design calls of operating angles less than 25°. When a universal joint is connected to the both ends of a shaft, it is known as a constant velocity joint.

Advantages of Universal Joint:

  1. Universal coupling is more flexible than knuckle joint.
  2. It facilitates torque transmission between shafts which have angular misalignment.
  3. It is cheap and cost effective.
  4. It is simple to be assembled and dismantled.
  5. Torque transmission efficiency is high.
  6. The joint permits angular displacements.

Applications of Universal Joint:

Universal joint has a wide range of applications. It is used in :
  1. Driveshafts
  2. Automobile propeller shafts
  3. Stone crushers
  4. Tapping machinery
  5. Centrifugal blowers
  6. Centrifugal fans and centrifugal pumps
  7. Belt conveyors
  8. Control mechanisms
  9. Marine equipments
  10. Metal forming machinery
  11. Sockets

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