Inch tapered roller bearing numbering system

Inch tapered roller bearing numbering system
The new number consists of five parts of letters and numbers:
Part 1 --- Prefix letter
The prefix letter is composed of 1-2 letters and is used to indicate the working condition level of the designed bearing.
EL: Extra Light
LL: plus light
L: light
LM: medium light
M: Medium
HM: medium heavy
H: Heavy
HH: Heavier type
EH: Extra Heavy
T: Dedicated to thrust bearings
The second part --- angle code
The first digit after the prefix letter represents the outer ring contact angle code.
The third part --- basic serial number
The second, third or fourth digits following the prefix letter indicate the corresponding base series.
Part Four --- Part Number
The 5th or 6th digit after the prefix letter, the last two digits, indicates the actual number of the bearing part.
The outer ring number is represented by any number from 10 to 19 (including 10 and 19).
The inner ring number is represented by any number from 30 to 49 in German (including 30 and 49). For any series of bearings, the first inner ring with the smallest section is numbered 49.
Part V --- Suffix
Single tapered roller bearings have an outer ring, and its inner ring and a set of tapered rollers are enclosed by a basket cage to form an inner ring assembly. The outer ring can be separated from the inner ring assembly. According to the ISO tapered roller bearing external dimension standard, any standard type of tapered roller bearing outer ring or inner ring assembly should be able to achieve international compatibility with the same type of outer ring or inner ring assembly. exchange. That is to say, the outer dimensions and tolerances of the same type of outer ring must comply with the provisions of ISO492 (GB307), and the cone angle of the inner ring components, the diameter of the cone of the components, etc. must also comply with the relevant regulations for interchangeability.
Usually, the taper angle of the outer ring raceway of a single row tapered roller bearing is before 10°~19°, which can simultaneously bear the combined action of bearing load and radial load. The larger the cone angle, the greater the ability to withstand axial loads. For bearings with a large cone angle, add B to the post code, and the cone angle is between 25° and 29°, which can withstand large axial loads. In addition, single row tapered roller bearings can adjust the size of the clearance during installation.
The outer ring (or inner ring) of 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 pre-interference of the double row tapered roller bearing can also be adjusted by the thickness of the spacer.
Four row tapered roller bearings
TIMKEN four-row tapered roller bearings are divided into:
Timken TQO (straight hole four-row combination) bearings,
Timken TQOW (with inner ring face lubrication groove TQO) bearings
Timken TQITS (four-row tapered bore combination) bearings
Timken TQITSE (TQIT, with extended inner ring) bearings.
This type of bearing has four rows of rollers, which can withstand extremely large radial loads and bidirectional axial loads, and has a low limit speed. It is widely used in various hot and cold rolling mills. The inner diameter of the bearing and the diameter of the roll adopt a transition fit. The size of the axial clearance has a great relationship with whether the tapered roller bearing can work normally. If the clearance is too small, the temperature rise will be high; if the clearance is large, the bearing will be easily damaged, so special attention should be paid to the three outer rings during installation , two inner rings, two outer spacers, one inner spacer factory typed number, do not install wrong.
The four-row tapered roller bearing is one of the main roll bearings. This type of bearing has a large radial and axial load capacity, and the radial load capacity is about three times that of a single row. It can withstand large bidirectional axial loads, but The limit speed is lower. It can limit the axial displacement of the shaft (or shell) in two directions within the range of the axial clearance of the bearing, so it can be used for bidirectional axial positioning. The diameter and axial clearance of the bearing can be adjusted by changing the thickness of the spacer between the inner and outer rings.
Four-row tapered roller bearings are mainly used for work rolls of hot rolling mills and cold rolling mills, as well as rolls of blanking mills. Due to the requirement of easy loading and unloading, it usually has a clearance fit with the roll neck. Tapered roller bearings generally use steel stamping cages, and when the size is large, pillar cages are used.