Tapered roller bearings are separate bearings, and 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 withstand radial loads and axial loads in a single direction. When the bearing is subjected to a radial load, an axial component will be generated, so that another bearing that can withstand the axial force in the opposite direction is needed to balance.

Introduction

A tapered roller bearing is a radial thrust type rolling bearing in which the rolling elements are tapered rollers. There are two kinds of small cone angle and large cone angle. The small cone angle mainly bears radial and axial combined loads mainly based on radial load. It is often used in double 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 cone angle is mainly subjected to axial and radial combined loads mainly based on axial loads. Generally, it is not used alone to withstand pure axial loads. When paired configuration (relatively installed at the same name), it can be used to withstand pure radial loads.

definition

The ability of a single row tapered roller bearing to withstand an axial load depends on the contact angle, ie the outer ring raceway angle, the greater the angle, the greater the axial load capacity. The largest number of tapered roller bearings are single row tapered roller bearings. In the front wheel hub of the car, a small-sized double-row tapered roller bearing is used. Four-row tapered roller bearings are used in heavy machinery such as large cold and hot rolling mills.

Structural features

The type of tapered roller bearing is 30,000, and the tapered roller bearing is a separate bearing. Under normal circumstances, especially in the size range of GB/T307.1-94 "Rolling bearing radial bearing tolerance", the tapered roller bearing outer ring and the inner component are 100% interchangeably usable.

The angle of the outer ring and the outer race diameter have been standardized as the outer dimensions. Changes are not allowed at the time of design and manufacture. So that the outer ring of the tapered roller bearing and the inner component can be universally interchanged worldwide.

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

classification

A single row tapered roller bearing has an outer ring, an inner ring assembly of the inner ring and a set of tapered rollers comprised of a basket cage. The outer ring can be separated from the inner ring assembly. According to the ISO tapered roller bearing external dimensions, 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, the outer ring of the same model must meet the requirements of ISO492 (GB307) in addition to the external dimensions and tolerances. The taper angle of the inner ring assembly and the diameter of the component cone must also comply with the relevant provisions of the interchange.

Generally, the single-row tapered roller bearing outer ring raceway has a cone angle of 10° to 19°, and can simultaneously bear the combined effect of axial load and radial load. The larger the cone angle, the greater the ability to withstand axial loads. Large cone angle bearing, rear code plus B, cone angle between 25 ° ~ 29 °, it 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 the double row tapered roller bearing is a unitary body. The inner rings of the two inner rings (or outer rings) are similar, and the spacers are arranged in the middle. The clearance is adjusted by the thickness of the spacers. The thickness of the spacers can also be used to adjust the pre-interference of the double-row tapered roller bearings.

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 the radial load is larger than that of double-row tapered roller bearings, and the limit speed is slightly lower, mainly used for heavy machinery.

Multi-sealed double and four-row tapered roller bearings,  long-life, multi-sealed double and four-row tapered roller bearings. Personalized new design of the bearing, changing the traditional design method of the fully sealed bearing, adopting a new sealing structure type combining sealing and dustproof, improving the sealing effect and improving the sealing performance. Multi-sealed double and four-row tapered roller bearings have a 20% to 40% increase in life compared to open-frame bearings; lubricant consumption is reduced by 80%.

use

Tapered roller bearings mainly bear radial and axial combined loads. The bearing capacity of the bearing depends on the raceway angle of the outer ring. The larger the angle, the greater the load carrying capacity. This type of bearing is a split type 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 the single-row tapered roller bearing needs to be adjusted by the user during installation; the double-row and four-row tapered roller bearing clearance has been given according to the user's requirements at the time of shipment from the factory, and no user adjustment is required.

Tapered roller bearings have a conical inner ring and an outer ring raceway, and tapered rollers are arranged between the two. 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 the bearing is mostly determined by the contact angle α; the larger the angle α, the higher the axial load capacity. The angle size is expressed by the calculation coefficient e; the larger the e value, the larger the contact angle, and the greater the applicability of the bearing to the axial load.

Tapered roller bearings are usually of a separate type, that is, a conical inner ring assembly consisting of an inner ring with a roller and a cage assembly can be mounted separately from the outer bevel (outer ring).

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