ISB single row tapered roller bearings have tapered raceways on the inner ring and also the outer ring, between which the tapered rollers roll (Fig. 1). The constructional design of ISB® single row tapered roller bearings makes them particularly suited to withstand combined radial and axial loads. The tapered roller bearings are usually separable, in other words the inner ring and the rollers and cage form a unit that can be fitted separately from the outer ring.
Cuscinetti ad una corona di rulli conici appaiati
In systems in which the load capacity of just one tapered roller bearing is not enough or when the shaft must be bound axially in both directions with a certain positive or negative axial clearance, the bearings described in the “single row tapered roller bearings” section can be used, which are available as paired sets (Fig.2) and arranged in “X” design.
The paired sets are an economic solution used to resolve a variety of problems and offer many advantages: • Simplified assembly
• Exact positioning of the shaft in the axial direction
• High axial and radial load capacity
• Simplified maintenance; the lubricant can be added through the annular groove and the lubrication holes of the intermediate shim
The overall dimensions of the metric ISB® single row tapered roller bearings comply with ISO 355:1997. ISB® single row tapered roller bearings in inches comply with standards ANSI/ABMA 19.2 - 1994.
ISB single row tapered roller bearings are able to tolerate just a very slight angular misalignment (a few arc minutes).
The inner rings with respective rollers and cage assembly and the outer rings of ISB® single row tapered roller bearings with the same designation are interchangeable. The total abutment width tolerance B of a bearing will not be exceeded if the cones and cups are interchanged. ISB® single row tapered roller bearings (both metric and in inches) are manufactured in the Normal precision class.
In the case of ISB single row tapered roller bearings, the internal clearance can only be obtained after assembly and it is indeed determined by the adjustment of the bearing itself against a second bearing, which provides location in the opposite direction.
• For standard applications, ISB single row tapered roller bearings have a pressed sheet steel cage (Fig. 3a). • For special applications, they are supplied with pressed cage made of polyamide 6.6 (Fig. 3b). This specific type of bearing can work at temperatures up to + 120°C, with the exception of some synthetic oil and synthetic oil-based grease.
Minimum load ISB single row tapered roller bearings must always be subjected to a given minimum load, especially if they work at high speeds. In this case, the forces of inertia of the rollers and cages and the friction of the lubricant may have a detrimental effect on the rolling conditions within the bearing and could cause harmful contact between rollers and raceways.
B Greater contact angle than standard version
J Pressed window-type sheet steel cage, centred on the rollers. The figure after J stands for a different cage design
P6 Greater dimensional and rotation precision, compliant with tolerance class 6 of standard ISO
TN9 Injection moulded snap-type cage made of polyamide 6.6 with fibreglass reinforcement, centred on the balls
X Overall dimensions modified to comply with ISO standards
DF Paired bearings arranged in “X” design