High Efficient Thrust Ball Bearings

Tapered roller bearings are classified into three types:

· Single-row

· Double-row

· Four-row

The main parameters of tapered roller bearings have been optimized, increasing the number of rollers and their effective length. The meticulous design of the rollers and raceways significantly improves geometric contact, stress distribution, and lubricant film formation, enhancing roller motion conditions. Consequently, compared to earlier models of the same size, these bearings offer higher load capacity and extended rated service life.

Double-row tapered roller bearings can withstand combined radial and axial loads (primarily radial) as well as bidirectional axial loads. A spacer is placed between the two inner rings, allowing clearance adjustment and uniform load distribution by varying the spacer thickness. These bearings are suitable for medium to low-speed applications.

Double-direction thrust ball bearings are separable bearings. They consist of:

· One shaft washer with grooves on both sides

· Two housing washers

· Two ball and cage assemblies

These bearings can accommodate bidirectional axial loads but cannot carry any radial load. They provide bidirectional axial positioning for the shaft.

The housing washers and ball-and-cage assemblies are identical to those used in corresponding single-direction bearings.

The basic dimensions of thrust ball bearings listed in the tables comply with ISO 104.

Standard thrust ball bearings are manufactured to P0 tolerance grade. Upon request, bearings with higher precision grades such as P6, P5, or even P4 can be provided. Tolerance values for each grade can be referenced in the standards.

Thrust ball bearings use either stamped steel cages or machined brass cages. The cage material for specific specifications is provided in the table below.

During operation, inertial forces may cause sliding between the balls and raceways, leading to increased temperature and damage to working surfaces. To prevent this, a minimum axial load F_{amin} must be applied:

F_{a min} \geq A \left( \frac{n_{max}}{1000} \right)^2

Where:

· F_{a min}: Minimum axial load (kN)

· A: Minimum load coefficient (provided in bearing dimension tables)

· n_{max}: Maximum operating speed (rpm)

The weight of supported components combined with external forces often exceeds the minimum load. If not, preload must be applied (e.g., using springs).

For single- and double-direction thrust ball bearings:

P_0 = F_a

For single- and double-direction thrust ball bearings:

P = F_a"