Tapered roller bearing belongs to separate bearing, and the inner and outer rings of the bearing have tapered raceways. This type of bearing is divided into single row, double row and four row tapered roller bearings according to the number of rows of rollers installed. Single row tapered roller bearings can withstand radial load and axial load in a single direction. When the bearing bears radial load, an axial component will be generated. Therefore, tapered roller bearing refers to the radial thrust rolling bearing with tapered roller as the rolling element. There are small cone angle and large cone angle. The small cone angle mainly bears the combined radial and axial load dominated by radial load, which is often used in double and installed in reverse. The inner and outer seat rings can be installed separately, and the radial and axial clearance can be adjusted during installation and use; The large cone angle mainly bears the combined axial and radial load dominated by axial load. Generally, it is not used to bear the pure axial load alone. It can be used to bear the pure radial load when it is used as a pair configuration (opposite installation at the same end).

The ability of single row tapered roller bearing to bear axial load depends on the contact angle, that is, the outer race raceway angle. The greater the angle, the greater the axial load capacity. Single row tapered roller bearings are the most used tapered roller bearings. A small size double row tapered roller bearing is used in the front wheel hub of a car. Four row tapered roller bearings are used in heavy machines such as large cold and hot rolling mills.

The type code of tapered roller bearing is 30000, and the tapered roller bearing is a separate bearing. In general, especially in GB / T307 The outer ring and inner components of tapered roller bearings within the size range involved in 1-94 tolerances for radial bearings of rolling bearings can be used interchangeably.

The angle of the outer ring and the diameter of the outer raceway are the same as the overall dimensions and are standardized. It is not allowed to change during design and manufacturing. So that the outer ring and inner components of tapered roller bearing can be interchanged all over the world.

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

Single row tapered roller bearing has an outer ring, and its inner ring and a group of tapered rollers are an inner ring assembly composed of basket cage. The outer ring can be separated from the inner ring assembly. According to the provisions of ISO tapered roller bearing overall dimension standard, the outer ring or inner ring assembly of any standard model of tapered roller bearing shall be able to realize international exchange with the outer ring or inner ring assembly of the same model. That is, for the outer ring of the same model, except that the external dimension and tolerance shall comply with the provisions of iso492 (gb307), the cone angle and cone diameter of the inner ring assembly must also comply with the relevant provisions of interchangeability.

Generally, the taper angle of the outer race of single row tapered roller bearing is between 10 ° ~ 19 °, which can bear the combined action of axial load and radial load at the same time. The greater the cone angle, the greater the ability to bear axial load. For the bearing with large cone angle, the post code plus B, and the cone angle is between 25 ° ~ 29 °, it can bear large axial load. In addition, the single row tapered roller bearings can adjust the clearance size during the installation process.

The outer ring (or inner ring) of double row tapered roller bearing is a whole. The small end faces of the two inner rings (or outer rings) are close, 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 bearing

The performance of this bearing is basically the same as that of double row tapered roller bearing, but it bears greater radial load and lower limit speed than double row tapered roller bearing. It is mainly used in heavy machinery.

Multi seal double and four row tapered roller bearings. ZWZ provides long-life, multi seal double and four row tapered roller bearings. Carry out personalized new design for the bearing, change the traditional design method of fully sealed bearing, and adopt a new sealing structure combining sealing and dust prevention to improve the sealing effect and sealing performance. Compared with the open structure bearing, the service life of multi seal double and four row tapered roller bearing is increased by 20% ~ 40%; Reduce lubricant consumption by 80%.

Tapered roller bearings mainly bear radial and axial combined loads. The bearing capacity depends on the raceway angle of the outer ring. The greater the angle, the greater the bearing capacity. This kind 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 bearing needs to be adjusted by the user during installation; The clearance of double row and four row tapered roller bearings has been given according to the user's requirements when the products leave the factory and does not need to be adjusted by the user.

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

The outer ring is usually separated from the cone-shaped roller bearing assembly with the inner ring.

Tapered roller bearings are widely used in automobile, rolling mill, mining, metallurgy, plastic machinery and other industries.

Another bearing that can bear the axial force in the opposite direction is needed to balance.