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Thrust hydrostatic bearing

Thrust hydrostatic bearing is a bearing device that relies on an external fluid supply system to form fluid pressure. It separates the bearing surface from the load contact area through a fluid film to achieve low friction, high load, and high precision operation.

Application scenarios
Machining equipment: CNC machine tools, grinders, lathe spindles.

Energy equipment: turbines, water turbines, wind turbines.

Precision instruments: astronomical telescopes, high-precision measuring equipment.

Industrial machinery: large water pumps, compressor thrust bearings.

Advantages and characteristics
Low friction: Liquid film isolation, significantly reducing wear.

High load: can withstand heavy loads and run smoothly.

High precision: uniform liquid film, small operating error.

Long life: non-contact design, reduced loss.

Good heat dissipation: fluid circulation takes away heat and the temperature is stable.

Запитване сега

Thrust hydrostatic bearing overview

Thrust hydrostatic bearings use an external pressure supply system (usually hydraulic oil or water-based medium) to deliver high-pressure fluid to form a stable oil film between friction pairs to achieve effective load transfer. This structure is designed for high-precision, heavy-load and low-friction working conditions.

Thrust hydrostatic bearings

Thrust   Hydrostatic Bearing Model Comparison Table
Brand/Manufacturer Модел Load Capacity   (kN) Speed Range (rpm) Fluid Film   Thickness (μm) Lubricant   Requirement Operating Temp.   Range (°C) Typical   Applications
SKF HTSF-1000 50   – 500 10   – 3,000 10   – 30 ISO   VG 32/46 Hydraulic Oil -20   to 120 Heavy-duty   machine tools, turbines
NSK THP-80A 30   – 300 50   – 5,000 5   – 25 Deionized   Water / Synthetic Oil 0   to 80 Precision   grinders, metrology equipment
THK HPSF-200 100   – 1,000 5   – 2,500 15   – 50 ISO   VG 68 Hydraulic Oil -30   to 150 Marine   propulsion, compressors
Rexroth HDB-500 200   – 2,000 1   – 1,500 20   – 60 High-Viscosity   Grease -10   to 100 Wind   turbine shafts, heavy machinery
Mitsubishi FSB-150 80   – 800 20   – 4,000 10   – 40 Water-Glycol   Mixture 5   to 70 Industrial   robots, CNC machines
Schaeffler HYDRA-300 150   – 1,500 10   – 3,500 12   – 45 ISO   VG 22/32 Hydraulic Oil -40   to 130 Aerospace,   high-precision instruments
Key Parameter Explanations
Load Capacity: Maximum axial load (static/dynamic) the bearing can   support.

Speed Range: Recommended operating RPM; excessive speed may cause film   rupture.

Fluid Film Thickness: Lubricant layer thickness affecting precision and   stability.

Lubricant Requirement: Common options include hydraulic oil, water-based   fluids, or specialty lubricants (filtration required).

Temperature Range: Ambient limits; high-temperature applications may need   cooling systems.
Selection Guidelines
High-Precision Applications (e.g., optical instruments): Choose models with   thin film thickness (5–20 μm) and low vibration (e.g., NSK THP series).

Heavy Load & Low Speed (e.g., marine bearings): Prioritize high load   capacity (>1000 kN) and low-speed models (e.g., THK HPSF-200).

High-Temperature Environments (e.g., turbines): Opt for high-temperature   lubricants (e.g., Schaeffler HYDRA series).

For detailed datasheets or custom specifications, please provide specific   requirements (load, speed, lubricant, etc.).

Main application areas

According to the usage scenarios and structural characteristics, Thrust hydrostatic bearing can be divided into the following categories:

Industrial processing equipment
CNC machining center (CNC)

Precision grinder and lathe spindle unit

Energy power device
Steam turbine and gas turbine

Core components of wind turbine

Hydraulic generator bearings

Thrust hydrostatic bearings for Hydroelectric enerator

Scientific research and testing instruments
Astronomical observation equipment

Thrust hydrostatic bearings for Astronomical Telescope

Precision experimental instruments

Transportation system
Ship power transmission mechanism

Key components of rail transit

Fluid machinery components
Large pump thrust components

Industrial compressor core bearings

Main brands:
SKF Thrust hydrostatic bearings
NSK Thrust hydrostatic bearings
FAG Thrust hydrostatic bearings
INA Thrust hydrostatic bearings
KOYO Thrust hydrostatic bearings
NACHI Thrust hydrostatic bearings
NTN Thrust hydrostatic bearings
TIMEKN Thrust hydrostatic bearings

Core performance advantages

Precision operation characteristics
The uniform fluid film layer can effectively compensate for the deformation of the working surface and ensure the operation accuracy.

Excellent load-bearing characteristics
The fluid lubrication mechanism avoids direct metal contact, and has both low friction coefficient and high load capacity.

Extremely long service life
The non-contact design greatly reduces mechanical wear and extends the service life.

Excellent thermal stability
The circulating fluid can take away heat in time to maintain the temperature balance of the system.

Wide environmental adaptability
The moisture-resistant and high-pressure characteristics enable it to maintain stable performance under harsh working conditions.

FAQ

What is the core difference between static pressure bearings and dynamic pressure bearings?

Static pressure type: Depends on the external pressure supply system, and the speed independence makes it particularly suitable for low-speed and heavy-load scenarios.

Dynamic pressure type: It needs to rely on the rotation of the shaft system to establish oil film pressure, which is more suitable for high-speed working conditions.

Media selection criteria?
It is recommended to use pure fluids with stable viscosity (such as special hydraulic oil or deionized water), and a filtering device must be equipped to ensure the cleanliness of the media.

Daily maintenance points?

Regularly monitor the working status of the pressure supply system

Replace failed filter elements and deteriorated media in time

Adaptability to high temperature environments?
By selecting high temperature resistant medium and integrating cooling unit, the requirements of high temperature working conditions can be met.

Economic analysis?
Although the initial investment is high, the comprehensive economic benefits are significant due to the ultra-long service life and extremely low maintenance cost.

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