tapered roller bearings

Tapered roller bearings are separable bearings, the inner and outer rings of the bearings have tapered raceways. This kind of bearing is divided into single row, double row and four row tapered roller bearings and other different structural types according to the number of columns installed. Single row tapered roller bearings can withstand radial loads and axial loads in a single direction. When the bearing bears a radial load, it will produce an axial force component, so when another bearing that can bear the opposite axial force is needed to balance it. [1]
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Chinese name tapered roller bearing foreign name Tapered Roller Bearings classification single row, double row and four row type code 30000
"Rolling Bearings Tolerances" Introduction Tapered roller bearings refer to radial thrust rolling bearings with 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 dominated by radial loads. It is often used in double and installed in reverse. The inner and outer races can be installed separately. The radial and axial clearances can be adjusted during installation and use. The large cone angle mainly bears axial and radial combined loads dominated by axial loads, and is generally not used alone to bear pure axial loads, it can be used to bear pure radial load when it is configured as a pair (with the same end installed opposite to each other).
Definition The ability of a single row tapered roller bearing to withstand axial load depends on the contact angle, that is, the angle of the outer ring raceway. The greater the angle, the greater the axial load capacity. Tapered roller bearings in the amount of the largest 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-duty machines such as large cold and hot rolling mills.
Structural characteristics of tapered roller bearing type code for 30000, tapered roller bearings for the separation of bearings. Under normal circumstances, especially in GB/T307.1-94 "rolling bearing to the heart bearing tolerance" involved in the size range of tapered roller bearing outer ring and inner assembly is one hundred percent can be commonly used interchangeably.
The angle of the outer ring and the diameter of the outer raceway have been standardized as the outer dimensions. Changes during design and manufacturing are not allowed. To enable universal interchange between the outer ring and the inner assembly of the tapered roller bearing worldwide.
Tapered roller bearings are mainly used to bear radial load mainly radial and axial combined load. Compared with angular contact ball bearings, the bearing capacity is large and the limit speed is low. Tapered roller bearings can withstand axial load in one direction and limit axial displacement of the shaft or housing in one direction. [
Classification Single row tapered roller bearings have an outer ring, its inner ring and a set of tapered rollers by a basket cage package into an inner ring assembly. The outer ring can be separated from the inner ring assembly. According to the ISO tapered roller bearing outline dimension standard, any standard type of tapered roller bearing outer ring or inner ring assembly should be able to achieve international interchange with the same type of outer ring or inner ring assembly. That is, in addition to the external dimensions and tolerances of the same type of outer ring, the cone angle and cone diameter of the inner ring assembly must also comply with the relevant provisions of interchange.
Generally, the taper angle of the outer ring raceway of the single row tapered roller bearing is between 10 ° and 19 °, which 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 withstand axial loads. Large cone angle bearing, rear code plus B, cone angle between 25 ° ~ 29 °, it can withstand large axial load. In addition, single row tapered roller bearings can adjust the size of the clearance during installation.
The outer ring (or inner ring) of the double row tapered roller bearing is a whole. The small end faces of the two inner rings (or outer rings) are similar, 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 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 the radial load is greater than that of double-row tapered roller bearings, and the limit speed is slightly lower. It is mainly used for heavy machinery.
Multi-sealed double and four-row tapered roller bearings, ZWZ provides long-life, multi-sealed double and four-row tapered roller bearings. The new design of the bearing is personalized, the traditional design method of the fully sealed bearing is changed, and the new sealing structure type combining sealing and dustproof is adopted to improve the sealing effect and the sealing performance. Multi-sealed double, four-row tapered roller bearings compared with open structure bearings, life increased by 20% to 40%; lubricant consumption reduced by 80%.
Purpose Tapered roller bearings mainly bear radial-based radial and axial combined loads. The bearing capacity depends on the raceway angle of the outer ring, the greater the angle, the greater the bearing capacity. This kind of bearing is a separation type bearing, according to the number of rolling elements in the bearing is divided into single row, double row and four row tapered roller bearings. Single-row tapered roller bearing clearance needs to be adjusted by the user during installation; double-row and four-row tapered roller bearing clearance has been given according to user requirements when the product leaves the factory and does not need to be adjusted by the user.
Tapered roller bearings
Tapered roller bearings have conical inner and outer ring raceways, and tapered rollers are arranged between the two. The projection lines of all conical surfaces meet at the same point of the bearing axis. This design makes tapered roller bearings particularly suitable for 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 greater the value of e, the greater the contact angle, and the greater the applicability of the bearing to bear the axial load.
Tapered roller bearings are usually separated, that is, the tapered inner ring assembly composed of the inner ring with rollers and the cage assembly can be installed separately from the tapered outer ring (outer ring).
Tapered roller bearings are widely used in automobiles, rolling mills, mining, metallurgy, plastic machinery and other industries.
The following information is provided by the fast and easy automatic selection.
Adjusting the axial clearance For the installation axial clearance of tapered roller bearings, the adjusting nut on the journal, the adjusting washer and the thread in the bearing seat hole can be used, or the pre-tightening spring can be used to adjust. The size of the axial clearance is related to the arrangement of the bearing installation, the distance between the bearings, and the material of the shaft and the bearing seat, and can be determined according to the working conditions.
For high load and high speed tapered roller bearings, when adjusting the clearance, the effect of temperature rise on the axial clearance must be considered, and the amount of clearance reduction caused by temperature rise is estimated, that is, the axial clearance should be appropriately adjusted to be larger.
For bearings with low speed and bearing vibration, they should be installed without clearance or with preload. Its purpose is to make the roller and the raceway of the tapered roller bearing have good contact, the load is evenly distributed, and the roller and the raceway are prevented from being damaged by vibration and impact. After adjustment, the size of the axial clearance is checked with a dial gauge.
Installation of four-row tapered roller bearings (mounting roller bearings):
1. four-row tapered roller bearing inner ring with the roll neck is generally with clearance, the installation of the bearing into the bearing box, and then the bearing box into the journal.
2. four-row tapered roller bearing outer ring and bearing box hole also use dynamic fit, first put the outer ring A into the bearing box. When leaving the factory, the outer ring, inner ring and inner and outer spacer rings are printed with the character {HotTag} symbol, which must be installed in the bearing box according to the sequence of character symbols. It cannot be arbitrarily interchanged to prevent the change of bearing clearance.
3. all parts are loaded into the bearing box, the inner ring and inner spacer ring, outer ring and outer spacer ring axial close.
4. measure the width of the gap between the end face of the outer ring and the bearing housing cover plate to determine the thickness of the corresponding sealing gasket.
Post code XRS mark for multi-sealed bearings. [3]
Parameter size range
The basic dimensions of ZWZ tapered roller bearings are listed in the dimension data sheet,
single row tapered roller bearings:
Inner diameter size range: 20mm ~ 1270mm
Outer diameter size range: 40mm ~ 1465mm
Width size range: 15mm ~ 240mm
double row tapered roller bearings:
Inner diameter size range: 38mm ~ 1560mm
Outer diameter size range: 70mm ~ 1800mm
Width size range: 50mm ~ 460mm
four row tapered roller bearings:
Inner diameter size range: 130mm ~ 1600mm
Outer diameter size range: 200mm ~ 2000mm
Width size range: 150mm ~ 1150mm
Tolerance
ZWZ metric tapered roller bearings have ordinary tolerances and also provide P6X, P6, P5, P4 and P2 tolerance products, all of which are in line with GB307.1.
ZWZ inch tapered roller bearings with ordinary tolerances, according to the need to provide CL2, CL3, CL0, CL00 class tolerance products.
Radial clearance
ZWZ single row tapered roller bearings only have clearance after installation, and can be determined after adjustment with another bearing positioned in the opposite direction.
Cage
Tapered roller bearings are generally stamped with steel plates and basket-shaped cages, but when the size is large, they are also used to make solid pillar cages.
1. When the bearing outer diameter D≤ 650mm, the steel plate stamping cage is adopted, and the rear code of the cage is not marked
2. When the bearing outer diameter D>650mm, the steel solid pillar cage is adopted, and the rear code of the cage is not marked
Allowable error
equivalent dynamic load
P = Fr KN] when Fa/Fr ≤ e
P = 0.4Fr + YFa [KN] when Fa/Fr>e
When single row tapered roller bearings are used in pairs (the basic dimensions can be different), the additional axial force caused by the radial load must be included in the calculation of the equivalent dynamic load of the bearing. The additional axial force S of a single row tapered roller bearing can be approximately calculated as follows: S = Fr/2Y
equivalent static load
Single row tapered roller bearings
P0=0.5Fr +Y0Fa KN]
P0 = Fr if P0<Fr
Double and four-row tapered roller bearings
P = 0Fr + Y1Fa [KN] when Fa/Fr ≤ e
P = 0.67Fr + Y2Fa [KN] when Fa/Fr>e
suffix definition
A: Changes in internal structure
B: Increased contact angle
X: international standards are adopted for external dimensions
CD: Double outer ring, with oil hole or oil groove.
TD: Double inner ring with tapered hole.