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 based on the radial load. It is often used in double use, reverse installation, the inner and outer races can be installed separately, and the radial and axial clearance can be adjusted during installation and use; The large taper angle mainly bears the combined axial and radial load mainly 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 ability of single row tapered roller bearings to bear axial load depends on the contact angle, that is, the outer ring raceway angle. The larger the angle, the greater the axial load capacity. The most used tapered roller bearings are single row tapered roller bearings. Small-sized double-row tapered roller bearings are used in the front wheel hubs of cars. Four-row tapered roller bearings are used in heavy machines such as large cold and hot rolling mills. Tapered roller bearings are mainly subjected to combined radial and axial loads based on the radial direction. The bearing capacity depends on the raceway angle of the outer ring, the greater the angle The greater the load capacity. This type of bearing is a separable 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 bearings needs to be adjusted by the user during installation; the clearance of double-row and four-row tapered roller bearings has been set at the factory according to user requirements, and no user adjustment is required. The tapered roller bearing has a tapered inner ring and an outer ring raceway, and the tapered rollers are arranged between the two. The projection lines of all cone surfaces converge at the same point on the bearing axis. This design makes tapered roller bearings particularly suitable for bearing compound (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 size of the angle is expressed by the calculation coefficient e; the greater the value of e, the greater the contact angle, and the greater the applicability of the bearing to bear axial load. Tapered roller bearings are usually separated, that is, the tapered inner ring assembly composed of the inner ring with roller and cage assembly can be installed separately from the tapered outer ring (outer ring). Tapered roller bearings are widely used in industries such as automobiles, rolling mills, mining, metallurgy, and plastic machinery. Adjusting the axial clearance For the installation axial clearance of tapered roller bearings, it can be adjusted with the adjusting nut on the journal, adjusting washer and the thread in the bearing seat hole, or using pre-tensioned springs. The size of the axial clearance is related to the arrangement of the bearings, the distance between the bearings, the material of the shaft and the bearing seat, and can be determined according to the working conditions. For tapered roller bearings with high loads and high speeds, when adjusting the clearance, the effect of temperature rise on the axial clearance must be considered, and the reduction in clearance caused by the temperature rise must be estimated, that is, the axial clearance It needs to be adjusted to be larger. For low-speed and vibration-bearing bearings, clearance-free installation or pre-load installation should be adopted. Its purpose is to make the rollers and raceways of tapered roller bearings have good contact, and the load is evenly distributed, and to prevent the rollers and raceways from being damaged by vibration and impact. After adjustment, the size of the axial clearance is checked with a dial indicator. Installation of four-row tapered roller bearings (installation of roller bearings): 1. The fit between the inner ring of the four-row tapered roller bearing and the roll neck is generally with a gap. When installing, first put the bearing into the bearing box, and then put the bearing box into the journal. The outer ring of the two- and four-row tapered roller bearing also adopts a dynamic fit with the bearing box hole. First, install the outer ring A into the bearing box. The word {HotTag} is printed on the outer ring, inner ring, and inner and outer spacers when leaving the factory, and must be installed in the bearing box in the order of the characters and symbols during installation. Can not be interchanged arbitrarily to prevent the change of bearing clearance. 3. After all the parts are installed in the bearing box, the inner ring and the inner spacer ring, the outer ring and the outer spacer ring are axially abutted. 4. Measure the gap width between the end face of the outer ring and the bearing box cover to determine the thickness of the corresponding gasket. Multi-sealed bearings use the post code XRS mark.