Importance of tapered roller bearings in mechanical products

Tapered roller bearings are separate bearings. Both the inner and outer rings of the bearing have tapered raceways. This type of bearing is divided into single, double and four-row tapered roller bearings according to the number of rollers installed. Single-row tapered roller bearings can support radial loads and axial loads in one direction. When the bearing is subjected to a radial load, an axial component will be generated, so another bearing that can withstand the axial force in the opposite direction is needed to be balanced.

Tapered roller bearings mainly bear radial and axial combined loads. Bearing bearing capacity depends on the raceway angle of the outer ring. The larger the angle, the larger the bearing capacity. This type of bearing is a separate bearing, which is divided into single row, double row and four row tapered roller bearings according to the number of rows of rolling elements in the bearing. The clearance of single-row tapered roller bearings needs to be adjusted by the user during installation; the clearances of double-row and four-row tapered roller bearings have been given according to user requirements when the product leaves the factory, and do not need to be adjusted by users.

Tapered roller bearings have tapered inner and outer ring raceways with tapered rollers arranged between them. The projection lines of all conical surfaces converge at the same point on the bearing axis. This design makes tapered roller bearings particularly suitable for bearing composite (radial and axial) loads. The axial load capacity of a bearing is mostly determined by the contact angle α; the larger the angle α, the higher the axial load capacity. The angle is expressed by the calculation coefficient e; the larger the value of e, the larger the contact angle, and the greater the applicability of the bearing to the axial load.

Tapered roller bearings are usually separated, that is, a tapered inner ring assembly composed of an inner ring with a roller and a cage assembly can be installed separately from the tapered outer ring (outer ring).

The single-row tapered roller bearing has an outer ring, an inner ring and a set of tapered rollers, which is an inner ring component formed by a basket-shaped cage. The outer ring can be separated from the inner ring component. According to the ISO standard for external dimensions of tapered roller bearings, the outer ring or inner ring component of any standard tapered roller bearing should be able to achieve internationality with the outer ring or inner ring component of the same model. exchange. That is to say, in addition to the outer dimensions and tolerances of the same model, the outside diameter and tolerances must meet the requirements of ISO492 (GB307), and the cone angle of the inner ring components and the diameter of the component cones must also meet the relevant regulations for interchange.

Generally, the tapered angle of the outer ring raceway of a single-row tapered roller bearing is 10 ° ~ 19 °, and it can simultaneously bear the combined action of axial load and radial load. The larger the cone angle, the greater the ability to withstand axial loads. Bearings with a large tapered angle, with a post code plus B, with a tapered angle between 25 ° and 29 °, can withstand large axial loads. In addition, single-row tapered roller bearings can adjust the amount of clearance during installation.

The outer ring (or inner ring) of a double-row tapered roller bearing is a whole. The two small inner end faces of the inner ring (or outer ring) are close to each other and there is a spacer in the middle. The clearance is adjusted by the thickness of the spacer. The thickness of the spacer can also be used to adjust the pre-interference of the double-row tapered roller bearing.

Four-row tapered roller bearings. The performance of this kind of bearings is basically the same as double-row tapered roller bearings, but it has a larger radial load and a lower limit speed than double-row tapered roller bearings. Rolling mill, etc.