Journal bearing

1. JOURNAL BEARING

2. INTRODUCTION A journal bearing, in its simplest form is a cylindrical bushing made of a suitable material and containing properly machined inside and outside diameters. The journal is usually the part of a shaft or pins that rotates inside the bearing.

3. Simple journal or solid bearing It is simply a block of cast iron with a hole for the shaft providing running fit. An oil hole is drilled at the top for lubrication. The main disadvantage of this type of bearing are There is no provision for wear and adjustment on account of wear. The shaft must be passed into the bearing axially, i.e. endwise. Limited load on shaft and speed of shaft is low .

4. OIL HOLE AXIAL OIL GROOVE

5. Bearing Diagram J ournal bearing - used to support the load on a rotating shaft. Oil inlet – used to insert the oil/lubrication As lubricating oil is fed into the bearing and is dragged by the shaft into the converging gap, the fluid pressure increases and a hydrodynamic lift is created. Axial oil groove have some space to prevent from oil loss.

6. Movement of the bearing

7. VIDEO OF JOURNAL BEARING

8. It handle high load and velocities because metal to metal contact is minimal due to the oil film. The journal bearing is remarkably durable and long lasting The damping effect of the oil film, journal bearing help make engines quiet and smooth running. They require large supply of lubricating oil . Suitable only for relative low temperature and speed. Starting resistance is much greater than running resistance due to slow build up of lubricant film around the bearing surface. ADVANTAGES DISADVANTAGES

9. CONCLUSION Journal bearing are widely use in gasoline and diesel fueled piston engine in motor vehicle and allowed parts to move together smoothly. Journal bearing are considered to be sliding bearing as opposed to rolling bearings such as ball bearings.