Hydro dynamic bearing

Hydrodynamic Bearings Advantages

Hydrodynamic bearings are used for larger, faster and stronger rotating equipment that requires stronger support for the rotating parts. These include steam turbine, gas turbines, marine shafts, pumps and motor that run on speed higher than 3000 RPM, or machinery running over 500 HP. Hydrodynamic bearings provide support for turbomachinery with a longer life time than ball bearing or roller bearings from the lubrication that prevents contact between the rotating parts of the bearings. In addition, hydrodynamic bearings can operate through the critical speed while maintaining optimum stability and suppress vibration while reducing noise.

Applications of Hydrodynamic Bearings

Applications of our hydrodynamic bearings include gas turbines, steam turbines, generators, heavy machinery rotary shafts with high speed requirements, hydroelectric turbines, large and heavy pumps, compressors, large engines, and etc.

Hydro Static Bearing

Hydro static lubrication is essentially a form of hydrodynamic lubrication in which the metal surfaces are separated by a complete film of oil, but instead of being self-generated, the separating pressure is supplied by an external oil pump as shown in the fig below.

Hydro static lubrication depends on the inlet pressure of lube oil and clearance between the metal surfaces, whereas in hydrodynamic lubrication it depends on the relative speed between the surfaces, oil viscosity, load on the surfaces, and clearance between the moving surfaces.

Hydro static bearings require an external pressurized supply system and some type of flow restrictor. Also, under dynamic motions, hydro static bearings may display a pneumatic hammer effect due to fluid compressibility. However, and most importantly, the load and static stiffness of a hydro static bearing are independent of fluid viscosity; thus making this bearing type very attractive for application with non-viscous fluids, including gases and cryogenics.

Over View

Bearings:

Bearings are primarily a load carrying member either with point contact or with line contact.

Classification:

   Based on Friction:

               ·    Friction Bearing

             ·    Anti-Friction Bearing

                                                            Ball Bearing

                                                            Roller Bearing

                                                            Needle Bearing

Based on type of Friction:

                ·    Sliding Friction

          ·    Rolling Friction

Based on Action of Fluid film   (Lubrication):

                ·    Hydro Static

          ·    Hydro Dynamic

Based on Load:

                ·    Axial Load

         ·    Radial Load

         ·    Combined Load

About me

  

I am being a Mechanical engineer with 40 years of experience in maintenance of production line and Power plant machines. During my services, I had come across many different kinds of problems and breakdowns which leads to partial or total shutdown of the plant. A suitable & safe method had to be adopted to fix the deficiency and put back the machine into operational. 

In my entire tenure, I had taken up many challenging tasks and successfully solved the issue. To expedite the maintenance, it is very much essential to understand the technology of machine. 

The idea of this website is to share my experience with young generation of Mechanical Engineers. 

Here is a moral story of an Old man's Experience.

A giant ship engine failed. The ship’s owners tried one expert after another, but none of them could figure but how to fix the engine.

Then they brought in an old man who had been fixing ships since he was a young. He carried a large bag of tools with him, and when he arrived, he immediately went to work. He inspected the engine very carefully, top to bottom.

Two of the ship’s owners were there, watching this man, hoping he would know what to do. After looking things over, the old man reached into his bag and pulled out a small hammer. He gently tapped something. Instantly, the engine lurched into life. He carefully put his hammer away. The engine was fixed!

A week later, the owners received a bill from the old man for ten thousand dollars.

“What?!” the owners exclaimed. “He hardly did anything!”

So they wrote the old man a note saying, “Please send us an itemized bill.

The man sent a bill that read:

Tapping with a hammer………………….. $ 2.00

Knowing where to tap…………………….. $ 9,998.00

Effort is important, but knowing where to make an effort makes all the difference!

Good Luck