Characteristics and classification of tapered roller bearings

Tapered roller bearings refer to radial thrust rolling bearings with tapered rollers. There are two types: small cone angle and large cone angle. The small cone angle mainly bears the combined radial and axial load, which is mainly the radial load. It is often used in double use and reverse installation. The inner and outer races can be installed separately. The radial and axial clearance can be adjusted during installation and use; The large taper angle mainly bears the combined axial and radial load based on the axial load. Generally, it is not used to bear pure axial load alone, but can be used to bear pure radial load when configured in pairs (the ends of the same name are installed relative to each other).

 

The type code of the tapered roller bearing is 30000, and the tapered roller bearing is a separable bearing. Under normal circumstances, especially in GB/T307.1-94 "Rolling Bearing Radial Bearing Tolerance", the tapered roller bearing outer ring and inner component can be used interchangeably in 100% of the size range.

The angle of the outer ring and the diameter of the outer raceway are the same as the outer dimensions and have been standardized. It is not allowed to change during design and manufacturing. As a result, the outer ring and inner components of the tapered roller bearing can be interchanged worldwide.

Tapered roller bearings are mainly used to bear combined radial and axial loads, mainly radial loads. Compared with angular contact ball bearings, the bearing capacity is large and the limit speed is low. Tapered roller bearings can withstand axial load in one direction and can limit axial displacement of the shaft or housing in one direction.

 

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

Generally, the tapered angle of the outer ring raceway of a single-row tapered roller bearing is between 10° and 19°, which can bear the combined action of axial load and radial load at the same time. The larger the cone angle, the greater the ability to withstand axial load. Bearings with large taper angle, add B to the rear code, and the taper angle is between 25° and 29°, and it can bear larger axial loads. In addition, single row tapered roller bearings can adjust the size of the clearance during the installation process.

The outer ring (or inner ring) of a double-row tapered roller bearing is a whole. The small end faces of the two inner rings (or outer rings) are similar, 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 type of bearing is basically the same as that of double-row tapered roller bearings, but it bears greater radial load than double-row tapered roller bearings and has a slightly lower limit speed. It is mainly used for heavy machinery.

Multi-sealed double and four-row tapered roller bearings, ZWZ provides long-life, multi-sealed double and four-row tapered roller bearings. Carry out a new and personalized design of the bearing, change the traditional design method of the fully sealed bearing, and adopt a new type of sealing structure that combines sealing and dust prevention to improve the sealing effect and improve the sealing performance. Compared with open structure bearings, multi-sealed double and four-row tapered roller bearings have an increased life span of 20%-40%; lubricant consumption can be reduced by 80%.