What is journal bearing apparatus?
DESCRIPTION: The apparatus consists of a plain steel shaft encased in a bearing and directly driven by a small electric motor. The bearing is freely supported on the shaft and sealed at motor end. The motor speed is precisely controlled by control unit and sealed at motor end.
How do you inspect a journal bearing?
Bearing inspection
- Verify that the bearing is at room temperature.
- Check the bearing number to verify proper application.
- Check the internal clearance of the bearing.
- Select a feeler gauge blade to match the minimum unmounted clearance given on the chart.
- Insert the feeler blade between two rollers and the outer race.
What is journal bearing in mechanical engineering?
Journal bearing is one in which the load acts perpendicular to the axis of the shaft as shown in Fig. 8.12(a). The load on the bearing acting perpendicular to the shaft axis is known as journal bearing.
What type of oil is used in journal bearing?
Bearings lubricated by a centralized grease dispensing systems typically use a #1, 0 or 00 grade of grease. The apparent viscosity of grease changes with shear (pressure, load and speed) that is, greases are non-Newtonian or thixotropic.
What is LD ratio in bearing?
Length to diameter ratio (L/D) ratio: In the design of bearings the diameter of the shaft is designed by the strength and rigidity criterion not on the bearing capacity. The length to diameter ratio (L/D) affects the performance of the bearing. As the ratio increases, the resulting film pressure increases.
What type of bearing is journal bearing?
Journal bearings are meant to include sleeve, plain, shell and babbitt bearings. The term babbitt actually refers to the layers of softer metals (lead, tin and copper) which form the metal contact surface of the bearing shell.
What is full journal bearing?
When the angle of contact of the bearing with the journal is 360° as shown in Fig (a), then the bearing is called a full journal bearing. This type of bearing is commonly used in industrial machinery to accommodate bearing loads in any radial direction.