INA needle roller bearings with ribs

INA needle roller bearings with ribs are ready-to-fit units. The outer ring and needle roller and cage assembly form a self-retaining unit. The needle roller and cage assembly is guided by the ribs on the outer ring. The outer ring has a lubrication groove and at least one lubrication hole. There is no relubrication facility in types NK with Fw ≦ 10 mm and NKI with d ≦ 7 mm. These INA bearings are predominantly of a single row design, type RNA69 is of a double row design above an enveloping circle diameter Fw = 40 mm and is therefore fitted with two needle roller and cage assemblies. The bearings are available:

• with or without an inner ring
• in a single or double row design
• as open or sealed versions

INA needle roller bearings with ribs, without inner ring

INA needle roller bearings with ribs on the outer ring and without an inner ring are available in the following types and dimension series:

• NK, NKS, RNA48, RNA49, RNA69 (single row)
• RNA69..-ZW (double row)
• RNA49..-RSR, RNA49..-2RSR (sealed on one or both sides)

For bearing arrangements with particularly compact radial dimensions
There bearings without an inner ring are highly suitable for bearing arrangements with particularly compact radial dimensions, if the shaft raceway can be hardened and ground. If no inner ring is used, the shaft can be designed to a greater thickness and thus with increased rigidity.

Length compensation (axial displacement facility)
Radial needle roller bearings are used as non-locating bearings, i. e. when the shaft must allow axial length compensation relative to the housing. For bearings without an inner ring, the axial displacement facility of the shaft is dependent on the width of the shaft raceway.

INA needle roller bearings with ribs, with inner ring

INA needle roller bearings with ribs on the outer ring and with an inner ring are available in the following types and dimension series:

• NKI, NKIS, NA48, NA49, NA69 (single row)
• NA69..-ZW (double row)
• NA49..-RSR, NA49..-2RSR (sealed on one or both sides)

These INA bearings with an inner ring are used if the shaft cannot be configured as a rolling bearing raceway. The bearings are of a single row design, NA69 is of a double row design from d ≧ 32 mm.

Axial displacement of the inner ring
For bearings with an inner ring, the axial displacement of the shaft relative to the housing occurs during rotational motion, without constraint in the bearing, between the needle rollers and the inner ring raceway without ribs. The maximum axial displacement s is given in the INA needle roller bearing tables. Where larger displacements occur, the standard ring can be replaced by a wider inner ring IR. Inner rings

Replacement of inner rings
In the case of the standard bearings, the inner rings are matched to the enveloping circle tolerance F6 and can be interchanged with each other (mixed use) within the same accuracy class.

Sffixes

Suffixes for available for designs: refer to the table below,