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Tapered roller bearing product information

November 05, 2018

definition

The Tapered Roller Bearing can be separated, and the assembly consisting of the inner ring and the roller and the cage and the outer ring can be respectively mounted by Tapered Roller bearings. Corrected contact lines at the roller and raceway contacts reduce stress concentrations. Tapered roller bearings can withstand large radial and axial loads. Since tapered roller bearings can only transmit one-way axial loads, another tapered Roller Bearing that is symmetrically mounted is required to transmit the axial load in the opposite direction. The largest number of tapered roller bearings are single row tapered roller bearings. In the front wheel hubs of cars, small-sized double-row tapered roller bearings have also been used in recent years. Four-row tapered roller bearings are used in heavy machinery such as large cold and hot rolling mills.

classification

The single row tapered roller bearing has an outer ring, the inner ring and a set of tapered rollers being surrounded by the basket cage into an inner ring assembly. 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°~19°, which can simultaneously bear the combined effect of bearing 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.

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 single-row tapered roller bearings needs to be adjusted by the user during installation; the double-row and four-row tapered roller bearing clearances are given according to user requirements when the product leaves 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, ie a conical inner ring assembly consisting of an inner ring with a roller and 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.

principle

The principle of the vibration of tapered roller bearings needs to utilize the grey system theory, fuzzy set theory and statistical regression theory, and apply the methods of grey correlation analysis, fuzzy set closeness analysis, linear regression analysis and grey fuzzy cluster analysis. The data is processed, etc., in order to reach a conclusion.

Under normal circumstances, the influence of the outer raceway parameters of the tapered roller bearing on the vibration is smaller than the inner raceway parameter, but in some special cases, the outer raceway parameter has more influence on the vibration than the inner raceway parameter; the tapered roller The parameters such as the crown value of the bearing, the mean value of the roughness of the roller ball base surface, and the roughness of the inner raceway have the greatest influence on the bearing vibration. In summary, the vibration of the bearing is affected by most of the parameters of the tapered roller.

installation

Adjust axial clearance

For the axial clearance of the tapered roller bearing, the adjusting nut on the journal, the adjusting washer and the thread in the bearing housing hole can be used, or the pre-tightening spring can be used for adjustment. The size of the axial clearance is related to the arrangement of the bearing when it is installed, the distance between the bearings, and the material of the shaft and the bearing housing, which can be determined according to the working conditions. For high-load and high-speed tapered roller bearings, the influence of temperature rise on axial clearance must be considered when adjusting the clearance, and the amount of clearance reduction caused by temperature rise is estimated, that is, axial clearance It should be adjusted a little bigger. For bearings with low speed and vibration, no clearance installation or preload installation is required. The purpose is to make the roller and the raceway of the tapered roller bearing have good contact, and the load is evenly distributed to prevent the roller and the raceway from being damaged by the vibration shock. After adjustment, the size of the axial clearance is checked with a dial gauge. The method is to first fix the dial gauge to the fuselage or the bearing seat, so that the dial gauge contact bears against the smooth surface of the shaft, and pushes the shaft along the axial direction, and the maximum swing of the needle 銉

Characteristics

The tapered roller bearing is designed such that the inner ring, the raceway surface of the outer ring and the tip of the roller cone converge on a point on the central axis of the bearing, and the radial load acts on the bearing to generate an axial force. Therefore, two bearings must be used either as a pair or as a double-row bearing or a double-row bearing. Combined and double row tapered roller bearings When the radial load acts on a tapered roller bearing, the internal contact angle produces an induced axial load. The induced axial load creates a force that separates the inner and outer rings, so a pair or multi-row tapered roller bearings are often used to counteract this force. Four row tapered roller bearings.

Thrust Ball Bearing Features: Thrust ball bearing is a separate type of bearing. The shaft ring and seat ring can be separated from the cage and steel ball components. The shaft ring is a ferrule that cooperates with the shaft. The seat ring is a ferrule that cooperates with the bearing housing hole, and there is a gap between the shaft; the thrust ball bearing can only bear the axial load, and the one-way thrust ball bearing can only bear With axial load in one direction, the two-way thrust ball bearing can withstand axial loads in both directions.



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