Tapered roller bearings are separate bearings. The inner and outer rings of the bearing have tapered raceways. This type of bearing is divided into different structural types such as 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 bear radial loads and axial loads in one direction. When the bearing is subjected to a radial load, an axial component force will be generated, so another bearing that can withstand the axial force in the opposite direction is needed to balance it. Widely used in automobiles, rolling mills, mining, metallurgy, plastic machinery and other industries.
The ability of single row tapered roller bearings to withstand axial loads depends on the contact angle, that is, the angle of the outer ring raceway. The larger the angle, the greater the axial load capacity. The most commonly used tapered roller bearings are single row tapered roller bearings. In the front wheel hub of the car, small-sized double-row tapered roller bearings are used. Four-row tapered roller bearings are used in heavy machines such as large cold and hot rolling mills.
The type code of tapered roller bearings is 30000, and tapered roller bearings are separate bearings. Under normal circumstances, especially within the size range involved in GB/T307.1-94 "Rolling Bearings Radial Bearing Tolerances", the outer ring and inner components of tapered roller bearings are 100% interchangeable.
The angle of the outer ring and the diameter of the outer raceway have been standardized and specified as the outer dimensions. Changes during design and manufacturing are not allowed. As a result, the outer ring and inner components of tapered roller bearings 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, they have large load-bearing capacity and low limit speed. Tapered roller bearings can withstand axial loads in one direction and can limit the axial displacement of the shaft or housing in one direction.
Single row tapered roller bearings have an outer ring, an inner ring and a set of tapered rollers, which are composed of an inner ring assembly composed of a basket-shaped cage. The outer ring can be separated from the inner ring assembly. According to the ISO tapered roller bearing outline dimension standards, any standard type of tapered roller bearing outer ring or inner ring assembly should be able to achieve international standards 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 rings of the same model, they must comply with the regulations of ISO492 (GB307). The cone angle of the inner ring components, the cone diameter of the components, etc. must also comply with the relevant regulations on interchange.
Usually, the cone angle of the outer ring raceway of a single-row tapered roller bearing is within 10°~19°, and it can withstand the combined effects 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 cone angles have a suffix code of B. The cone angle is between 25° and 29°. They can withstand large axial loads. In addition, single row tapered roller bearings can adjust the clearance during installation.
The outer ring (or inner ring) of double row tapered roller bearings is a whole. The small end faces of the two inner rings (or outer rings) are close to each other, and there is a spacer ring in the middle. The clearance is adjusted by the thickness of the spacer ring. The thickness of the spacer ring 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 bearing is basically the same as that of double-row tapered roller bearings, but it can bear larger radial load than double-row tapered roller bearings and has a slightly lower limit speed. It is mainly used in heavy machinery, such as Rolling mill, etc.
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 personalized new design for the bearing, change the traditional design method of fully sealed bearings, and adopt a new sealing structure type that combines sealing and dustproofing to improve the sealing effect and sealing performance. Compared with open structure bearings, multi-sealed double and four-row tapered roller bearings have a service life increased by 20% to 40%; lubricant consumption is reduced by 80%.
Tapered roller bearings mainly bear combined radial and axial loads, which are mainly radial. The load-bearing capacity of the bearing depends on the raceway angle of the outer ring. The larger the angle, the greater the load-bearing capacity. This type of bearing is a separable bearing and 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 clearance of double-row and four-row tapered roller bearings has been set according to user requirements when the product leaves the factory and does not require user adjustment.
Tapered roller bearings have conical inner and outer 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 carrying combined (radial and axial) loads. The axial load capacity of the bearing is mostly determined by the contact angle α; the larger the α angle, the higher the axial load capacity. The size of the angle is expressed by the calculation coefficient e; the larger the value of e, the larger the contact angle, and the greater the suitability of the bearing for bearing axial loads.
Tapered roller bearings are usually of the separable type, that is, the tapered inner ring assembly consisting of an inner ring with a roller and cage assembly can be installed separately from the tapered outer ring (outer ring).
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