Four-row tapered roller bearings, TQI design

Type TQIT bearings have a tapered bore that is matched and continuous through the inner races. This allows for an interference fit on the backup rolls of high-speed mills, where a loose inner race fit of a straight bore bearing could cause excessive neck wear. The indirect mounting of the bearing pairs increases the overall effective spread of the bearing, providing optimum stability and roll rigidity. Design Attributes: Two tapered-bore single cones, one tapered-bore double cone, four single cups and three cup spacers. Front faces of single cones and both faces of double cone are extended to contact each other. Tapered cone bores are matched for continuous taper through the cones. Lubrication delivered through three cup spacers. Preset, matched assemblies, serial numbered to assure correct installation.

  • Size range: ID 123.022 mm to 1004.633 mm (4.8434 in. to 39.5525 in.) OD 174.625 mm to 2032.000 mm (6.8750 mm to 80.0000 in.)
  • Applications: Roll necks of high-speed rolling mills

Depending on their design, four-row tapered roller bearings provide the following main features and benefits:

Long service life.

The four-cup design (four separate outer rings) provides optimal load distribution over all four rows of rollers.

Enhanced operational reliability

Optimized surface finish on the contact surfaces of the rollers and raceways supports the formation of a hydrodynamic lubricant film.


Improved wear resistance

In particular, FV bearings are made of extremely clean and homogenous steel and undergo a unique heat treatment, which improve the resistance to wear.


Improved sealing performance with less leakage and less frictional heat

The optimized seal design ensures high protection against external contamination but keeps friction and frictional heat low. This seal design also provides a better retention of lubricant, minimizes environmental impact and reduces maintenance costs.

Equal load carrying capacity for sealed and open bearings

The optimized and compact seal design enables identical internal design.

Total bearing interchangeability

Bearings with and without intermediate rings as well as open and sealed bearings are available with identical external dimensions. This allows total bearing interchangeability of current standard design bearings with those without intermediate rings and/or with optimized seal design.

Separable mounting and simpler inspection

Optimized designs without intermediate rings enable to dismount and separate the cage and roller assemblies and seals. This facilitates mounting, dismounting and also maintenance inspection routines.

Axial space-saving and cost-effective solution for roll necks

The roll necks can be relatively short, no separate axial bearings are required and identically designed chocks can be used on both sides of the roll.

Simple axial location on roll necks

Tighter inner ring width tolerances facilitate the tolerancing and dimensioning of surrounding components. 

Keyword: Roll neck bearings, Rolling mill bearings, Four row tapered roller bearing


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Principal dimensions [mm]Basic load ratingsFatigue load limitDesignationDesign

dynamicstatic


dDBTC[kN]C0[kN]Pu[kN]BEARING CODE
287.5440330.328441808500720BT4B 332997/HA1TQIT
287.5440330.328441808500735BT4B 332997 B/HA1TQINT
320422.275290261.42430808150680BT4B 332716/HA1TQIT
333.375469.9366.712328.612457011400930BT4B 328083/HA1TQI
368.294523.875411.162366.7125830150001160BT4B 334056 B/HA1TQI
368.3523.875411.162366.7125830150001160BT4B 334011TQI
384.175546.1437.96384.1756440166001290BT4B 334048/HA1TQI
391.071550428.625384.1756440166001290BT4B 328305/HA1TQIT
400540295330484012500980BT4-8050/HA1TQI
400540330295484012500980332297TQI
406.4590.55434.9753816930166001270BT4B 328923/HA1TQI
406.445565.201409.575365.1256050156001180BT4B 332813 B/HA1C425TQI
415.925590.55479.96419.17210193001430BT4B 334047/HA1TQI
419.1590.55469.9419.17210193001460BT4B 328203/HA1TQIT
431.8571.5366.713320.6754950140001060331999TQI
4505953883525500163001220BT4-8053/HA1TQI
453.39635496.888446.0888250220001600BT4B 332822/HA1TQIT
482.6615.95355.6317.55120153001120BT4B 328268/HA1TQI
482.6647.7436.5401.6387210200001460BT4-8052/HA1TQI
488.95679.45533.4479.4259350255001830BT4B 332760/HA1TQIT
5106554053626270190001370BT4B 328732/HA1TQI
530.225736.6579.438519.11211200310002160BT4B 332933/HA1TQIT
555.233761.873692.15536.57511700320002200BT4B 334125/HA1TQITE
581.025812.8641.35571.512100320002160BT4B 332658/HA4TQIT
604.838787.4420.688369.8888420232001660BT4B 328045/HA1TQIT
644.525857.25590.55523.87512100365002400BT4B 332934/HA1TQIT
669.925933.45725.488649.28817200490003150BT4B 332928/HA1TQIT
744.5381035.05812.8727.07520500585003600BT4B 332943/HA4TQIT.1
749.3990.665057715100455002850BT4B 332596/HA4TQIT.1
770104080065018300530003250BT4B 334099/HA4TQITE.1
777.8751079.5844.55755.6522000630003800BT4B 332956/HA4TQIT.1
863.61130.3717.55644.52519800620003750BT4B 332571/HA4TQIT.1
872.7691181.1714.375628.6520900570003550BT4B 332786/HA4TQIT.1
872.8471181.1714.375628.6520900570003550BT4B 328956/HA4TQIT.1
879.4751219.2933.45838.228100815004800BT4B 328074/HA4TQIT.1
8891219.2880784.22527000780004550BT4B 332602/HA4TQIT.1
896.903126476668022900640003800BT4B 334081/HA4TQIT.1
1004.6341308.1812.8730.2524600765004400BT4B 332720/HA4TQIT.1


附加内容-产品描述。

附加内容-产品描述。

附加内容-产品描述。