Load Bearing Capacity of a Hydrodynamic Slider Bearing

A hydrodynamic slider bearing is a type of bearing that relies on the formation of a lubricating oil film between the sliding surfaces to support the load and reduce friction. The load bearing capacity of such a bearing is primarily developed due to the presence of a wedge-shaped oil film.

Wedge Shaped Oil Film

When a load is applied to the slider bearing, it causes the two sliding surfaces to separate slightly, forming a small gap. The lubricating oil fills this gap and forms a wedge-shaped film between the surfaces. This film gradually becomes thicker towards the outlet side of the bearing, creating a pressure gradient across the film. The pressure at the inlet side of the bearing is lower than the pressure at the outlet side, creating a hydrodynamic lifting force that supports the load.

Oil Compressibility and Viscosity

While oil compressibility and viscosity do play a role in the functioning of a hydrodynamic slider bearing, they are not the main factors responsible for its load bearing capacity.

Oil compressibility refers to the ability of the lubricating oil to change in volume under the influence of pressure. While it does contribute to the overall behavior of the oil film, its effect on load bearing capacity is relatively small compared to the wedge-shaped oil film.

Oil viscosity, on the other hand, determines the resistance of the oil to flow and is important for maintaining a stable oil film. However, it does not directly contribute to the load bearing capacity of the bearing.

Conclusion

In conclusion, the correct answer is option 'B' - the load bearing capacity of a hydrodynamic slider bearing mainly develops due to the presence of a wedge-shaped oil film. While oil compressibility and viscosity are important factors in the functioning of the bearing, they do not directly contribute to its load bearing capacity.