Tapered roller bearing is a kind of radial thrust rolling bearing whose rolling element is tapered roller. There are small cone angle and large cone angle. The small cone angle mainly bears the radial and axial combined load dominated by the radial load. It is often used in pairs and installed in reverse direction. The inner and outer seat rings can be installed separately, and the radial and axial clearance can be adjusted during the installation and use; The large cone angle is mainly used to bear the combined axial and radial load, which is mainly axial load. Generally, it is not used to bear the pure axial load alone, but can bear the pure radial load when it is used as a pair configuration (the same end is installed opposite to each other).
The axial load bearing capacity of single row tapered roller bearing depends on the contact angle, that is, the outer ring raceway angle. The larger the angle is, the greater the axial load capacity is. Single row tapered roller bearing is the most widely used tapered roller bearing. In the front wheel hub of a car, a small size double row tapered roller bearing is used. Four row tapered roller bearings are used in large cold and hot rolling mills and other heavy machines.
The type code of tapered roller bearing is 30000, and the tapered roller bearing is a separate type bearing. In general, especially in GB / t307.1-94 "rolling bearings radial bearing tolerances" involved in the size range of tapered roller bearing outer ring and inner components are 100% interchangeable.
The angle of the outer ring and the diameter of the outer raceway have been standardized as the overall dimensions. It is not allowed to change during design and manufacture. So that the outer ring and inner assembly of tapered roller bearing can be interchanged in the world.
Tapered roller bearing is mainly used to bear radial and axial combined load which is mainly 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.
The single row tapered roller bearing has an outer ring, and its inner ring and a set of tapered rollers are an inner ring assembly enclosed by a basket cage. The outer ring can be separated from the inner ring assembly. According to the requirements of ISO tapered roller bearing dimension standard, the outer ring or inner ring assembly of any standard model of tapered roller bearing should be internationally interchangeable with the outer ring or inner ring assembly of the same model. That is to say, the external dimension and tolerance of the outer ring of the same model shall comply with the provisions of iso492 (gb307), and the cone angle and cone diameter of the inner ring assembly shall also comply with the relevant provisions of interchangeability.
Generally, the taper angle of outer ring raceway of single row tapered roller bearing is 10 °~ nineteen ° It 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 bear the axial load. For bearings with large taper angle, the rear code is added with B, and the taper angle is 25 °~ twenty-nine ° It can bear larger 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 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, and the thickness of the spacer can also be used to adjust the pre interference of double row tapered roller bearings.
Four row tapered roller bearing, the performance of this kind of bearing is basically the same as that of double row tapered roller bearing, but it bears greater radial load than double row tapered roller bearing, and its limit speed is slightly lower, so it is mainly used in heavy machinery.
ZWZ provides long life, multi seal double and four row tapered roller bearings. In order to improve the sealing effect and improve the sealing performance, a new type of sealing structure combining sealing with dust prevention is adopted. Compared with the open structure bearing, the service life of multi seal double row and four row tapered roller bearing is increased by 20% ~ 40%; Lubricant consumption reduced by 80%.
Tapered roller bearings mainly bear the radial and axial combined load. The bearing capacity depends on the raceway angle of the outer ring, and the larger the angle is, the better the bearing capacity is
The greater the load carrying capacity. According to the number of rolling elements in the bearing, it can be divided into single row, double row and four row tapered roller bearings. The clearance of single row tapered roller bearing needs to be adjusted by users 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 it does not need to be adjusted by the user.
Tapered roller bearings have tapered inner ring and outer ring raceways, and tapered rollers are arranged between them. The projection lines of all conical surfaces converge at the same point of the bearing axis. This design makes tapered roller bearings particularly suitable for compound (radial and axial) loads. The axial load capacity of the bearing is mostly determined by the contact angle α It is decided; α The larger the angle, the higher the axial load capacity. The angle is expressed by the calculation coefficient E; The larger the E value is, the larger the contact angle is, and the greater the applicability of bearing to bear axial load is.
Tapered roller bearings are usually separated, that is, the tapered inner ring assembly composed of roller and cage assembly can be installed separately from the tapered outer ring (outer ring).
Tapered roller bearings are widely used in automobile, rolling mill, mining, metallurgy, plastic machinery and other industries.
The basic dimensions of tapered roller bearings are listed in the dimensional data sheet,
Single row tapered roller bearings:
Inner diameter range: 20 mm ~ 1270 mm
Outer diameter range: 40mm ~ 1465mm
Width range: 15mm ~ 240mm
Double row tapered roller bearing:
Inner diameter range: 38mm ~ 1560mm
Outer diameter range: 70mm ~ 1800mm
Width range: 50mm ~ 460mm
Four row tapered roller bearings:
Inner diameter range: 130mm ~ 1600mm
Outer diameter range: 200 mm ~ 2000 mm
Width range: 150 mm ~ 1150 mm