RAH Tapered Roller Bearings

Tapered Roller Bearings, How Much Do You Learn of This Type Roller Bearings, Follow our Article to learn well of Taper Roller Bearings

Tapered roller bearings belong to the separation of bearings, bearings of the inner and outer rings have tapered raceway. This type of bearing according to the number of columns installed roller is divided into single row, double row and four rows of tapered roller bearings and other different structure type. Single row tapered roller bearings can withstand radial load and single direction axial load. When bearings bear radial load, will produce an axial force, so need another can bear the opposite direction of axial force bearing to balance.

Baic information

Name	Tapered Roller Bearings	Item Type	30000
Description	separate bearing	Related	tolerances for radial bearings of rolling bearings
Type	single, double and four row	Function	combined load

Define
The ability of single row tapered roller bearings to withstand 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 largest amount of tapered roller bearings is single row tapered roller bearings. In the front wheel hub of the car, with a small size double row tapered roller bearings. Four rows of tapered roller bearings are used in large cold and hot rolling mills and other heavy machinery.

Structural characteristics
The type code of tapered roller bearings is 30000, and the tapered roller bearings are separated bearings. In general, especially in GB/T307.1-94 "Tolerances for radial bearings of rolling bearings", the size range of tapered roller bearings is 100 per cent interchangeable between the outer ring and the inner component.

The angle of the outer ring and the dimensions of the outer raceway diameters are standardised in the same way as the external dimensions. It is not allowed to change in the design and manufacture. In order to cause the outer ring of the tapered roller bearings and the inner components of the universal interchangeable in the world.

Tapered roller bearings are mainly used to bear radial load mainly radial and axial joint load. Compared with angular contact ball bearings, they have a large load carrying capacity and low limiting speed. Tapered roller bearings can withstand a direction of the axial load, can limit the shaft or shell a direction of the axial displacement.

Classification
Single row tapered roller bearings have an outer ring, its inner ring and a set of tapered rollers by the basket-shaped keep frame encompassed into an inner ring assembly. The outer ring can be separated from the inner ring assembly, in accordance with the provisions of ISO tapered roller bearing dimensions standard, any one of the standard type of tapered roller bearing outer ring or inner ring assembly should be able to achieve international interchangeability with the same type of outer ring or inner ring assembly. That is, the same type of outer ring in addition to the external dimensions, tolerances need to comply with ISO492 (GB307) regulations, the inner ring components of the cone angle, component diameter of the cone and so on must also comply with the relevant provisions of the swap.

Usually, single row tapered roller bearings outer raceway cone angle between 10 ° ~ 19 °, can simultaneously withstand axial load and radial load of the joint role. 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 larger axial load. In addition, single row tapered roller bearings can adjust the size of the clearance in the installation process.

Double row tapered roller bearings outer ring (or inner ring) is a whole. Two inner ring (or outer ring) small end face is close, there is a spacer in the middle, the clearance is by the thickness of the spacer to adjust, can also use the thickness of the spacer to adjust the double row tapered roller bearings pre-surge.
Four rows of tapered roller bearings, the performance of such bearings and double rows of tapered roller bearings are basically the same, but more than double rows of tapered roller bearings to withstand the radial load is greater, the limit speed is slightly lower, mainly for heavy machinery.

Multi-sealed double, four rows of tapered roller bearings, ZWZ provides long life, multi-sealed double, four rows of tapered roller bearings. Individualised new design of bearings, change the traditional design of fully sealed bearings, using a combination of sealing and dustproof new sealing structure type, improve the sealing effect, improve the sealing performance. Multi-sealed double, four rows tapered roller bearings and open structure bearings compared to life increased by 20% ~ 40%; lubricant consumption reduced by 80%.

Application
Tapered roller bearings mainly bear radial mainly diameter, axial joint load. Bearing capacity depends on the raceway angle of the outer ring, the larger the angle, the greater the bearing capacity.

The larger the angle, the greater the load carrying capacity. This kind of bearing belongs to the separation type bearing, according to the number of columns in the bearing rolling body is divided into single row, double row and four rows of tapered roller bearings. Single row tapered roller bearings clearance to be adjusted by the user in the installation; double and four rows of tapered roller bearings clearance has been in the factory according to the user's requirements given, without user adjustment.

Tapered roller bearings have conical inner ring and outer ring raceway, tapered roller arranged between the two. The projection lines of all tapered surfaces converge at the same point of the bearing axis. This design makes tapered roller bearings particularly suitable for carrying compound (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. Angle size with calculation coefficient e to express; e value is larger, the larger the contact angle, the bearing to withstand axial load applicability is greater.

Tapered roller bearings are usually of the separated type, i.e. the tapered inner ring assembly consisting of an inner ring with rollers and cage assembly can be mounted separately from the tapered outer ring (outer ring).

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

Installation

Adjustment of axial clearance For the axial clearance of the mounting of tapered roller bearings, it can be adjusted by the adjusting nut on the journal, the adjusting spacer and the threads in the bore of the bearing housing, or by the method of preloading the spring. The size of the axial clearance, and bearing installation arrangement, the distance between the bearing, shaft and housing materials, can be determined according to the working conditions.

For high load and high speed tapered roller bearings, adjust the clearance, must consider the temperature rise on the axial clearance, the temperature rise caused by the clearance reduction is estimated, that is to say, the axial clearance should be appropriately adjusted to a larger.

For low speed and bear vibration bearing, should take no clearance installation, or apply preload installation. The purpose is to make the tapered roller bearings roller and raceway to produce good contact, load uniform distribution, to prevent the roller and raceway by vibration impact was destroyed. After adjustment, the size of the axial clearance is checked with a micrometer.

Four rows of tapered roller bearings installation (installation of roller bearings).

First, four rows of tapered roller bearings inner ring and roller neck of the fit is generally with clearance, installation of the bearing into the bearing box, and then the bearing box into the journal.
Second, four rows of tapered roller bearings outer ring and bearing box hole also adopts dynamic fit, first the outer ring A into the bearing box. Factory in the outer ring, inner ring and inner and outer spacer are printed with characters {HotTag} symbols, installation must be in accordance with the order of the character symbols sequentially loaded into the bearing box. Can not be arbitrarily interchanged to prevent changes in bearing clearance.

Third, all parts are loaded into the bearing box, the inner ring and inner spacer, outer ring and outer spacer axial tight.

Fourth, measure the width of the gap between the outer ring end face and the bearing box cover to determine the thickness of the corresponding seal gasket.

Multi-seal bearings are marked with rear code XRS.

Parameter-Size range
The basic dimensions of ZWZ tapered roller bearings are listed in the dimensional data table.

Single row tapered roller bearings.

Inner diameter range: 20mm~1270mm
Outside diameter range: 40mm~1465mm
Width size range: 15mm~240mm

Double row tapered roller bearings

Inside diameter range:38mm~1560mm
Outside diameter range:70mm~1800mm
Width size range:50mm~460mm

Four rows of tapered roller bearings

Inside diameter range:130mm~1600mm
Outside diameter range:200mm~2000mm
Width size range:150mm~1150mm

common difference (of an arithmetic series)
ZWZ metric tapered roller bearings have ordinary grade tolerance, also provide P6X, P6, P5, P4, P2 grade tolerance products, all with GB307.1.

ZWZ inch tapered roller bearings with ordinary grade tolerance, according to the need to also provide CL2, CL3, CL0, CL00 grade tolerance products.

Radial clearance

ZWZ single row tapered roller bearings have clearance only after mounting and can be determined only after having another bearing positioned in the opposite direction for adjustment.

Cage
Tapered roller bearings are generally used steel plate stamping, basket-shaped cage, but when the size is larger, but also used in the car entity pillar cage.

1, when the bearing outer diameter D ≤ 650mm, the steel plate stamping keep frame, keep frame rear code are not signs
2. when the bearing outer diameter D>650mm, the steel entity strut cage, cage rear code 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 external dimensions can be different), the additional axial force caused by the radial load must be taken into account when calculating the equivalent dynamic load of the bearing. Single row tapered roller bearings additional axial force S, can be approximated according to the following formula: S = Fr/2Y

Equivalent static load

Single row tapered roller bearings

P0=0.5Fr +Y0Fa KN]
If P0
Double-row 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:Internal structural change
B:Increased contact angle
X:External dimensions using international standards
CD:Double outer ring with oil holes or grooves.
TD:Double inner ring with taper hole.

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