High Pressure Technology for Hydrostatic Bearing Lubrication

Sleeve bearings are frequently found in mechanical and instrument engineering. Characteristic for these typ of bearings is a slinding movement between the shaft and the bearing which is creating friction between the parts. Friction can be minimized by suitable lubrication.
A hydrostatic slide bearing has an active lubrication circuit. High pressure pumps are creating an oil film between the shaft and the bearing surface before start up and during operation.

URACA pumps are generating realiable the required oil pressure for these bearings.

Our services for your benefit

  • URACA was present in this area from the beginning
  • delivery of the first Morgoil pump as early as 1968
  • close cooperation with engineering companies and customers
  • pump design for high performance applications
  • pressures up to 1,500 bar
  • flow rates of up to 20 l / min
  • over 800 reference customers around the world
  • robust, solid and durable pump technology
  • satisfied customers and long-term partnerships

Mode of operation of the hydrostatic bearing lubrication

In sliding bearings, a sliding movement takes place between shaft and axle. Possible bearing types are plain, unlubricated or grease lubricated plain bearings, hydrodynamic and hydrostatic sliding bearings. The sliding resistance of the bearing is dependent by solid friction, mixed friction or fluid friction.

In hydrodynamik bearings, the oil film between the shaft and the bearing is generated by the rotation of the shaft inside the bearing by a special geometry creating a pumping action inside the bearing. Mixed friction therefore prevails in these phases. Only at higher speed, a complete oil film forms and the friction is reduced.

In hydrostatic bearings external pumps fill the oil pockets of the slide bearings by high pressure with a constant oil flow. This ensures that shaft and bearing don't have direct contact at any time. Due to the constant full lubrication fluid friction is created, which is lower than the solid friction. The sliding bearings work with very little wear and tear and are extremely durable.

Due to the increased complexity of the external lubricant circuit, this type of plain bearing lubrication is used, especially in large machines. The pump technology delivers high, consistent pressure and works reliably over a long period of time.

  • less bearing wear
  • less energy loss
  • low friction even when starting and stopping the machines
  • highest precision of the bearings
  • long shelf lives

Hydrostatic applications confront high-pressure technology with great challenges. The pumps have to generate a pressure of up to 1,500 bar and work very reliably. The flow rate of the lubricant oil with a viscosity of up to 1,000 cSt can be up to 20 liters per minute.

Wherever high concentricity, low wear and high load capacity are required, hydrostatic bearings offer ideal solutions. In mechanical engineering and equipment, sliding bearings are the most commonly used bearing type in addition to anti-friction bearings. In particular, high-precision applications of measuring, testing and machine tool engineering benefit from the advantages of the hydrostatic bearing. Other applications include turbine and generator bearings in power plants.

For hydrostatic bearings, high-pressure pumps supply lubricant to the constant oil film between the moving parts. The bearings are characterized by their longevity and low-wear operation.

URACA has many years of experience in this field and has numerous references worldwide. Do you have any questions about high pressure technology for hydrostatic bearings? Contact the experts of URACA now. We are happy to advise you comprehensively.