Needle bearings

These bearings are mainly selected for constructions requiring reduced radial dimensions and maximum rigidity and load capacity. They have little resistance for axial forces (except thrusts and combined bearings).

NEEDLE ROLLER AND CAGE ASSEMBLIES

A needle cage comprises an inseparable cage and needles and can be used to design very compact, light, constructions with maximum capacity. The shaft and housing act as a raceway and must be machined in compliance with hardness, geometry and roughness characteristics. The needles are guided precisely, therefore the needle cage can absorb much higher speeds of rotation than contact needles.
Depending on the application, different types of materials and cages are available:

Types Characteristics Suffixes
K Fibre glass reinforced polyamide -T2
K o KJ Welded pressed steel cage -S
GK / GPK In two parts
K Two rows -ZW
KBK For piston pins application
KV For piston pins application -S
PK / GPK For crank pins application
KMJ For crank pins application -S

Inch solutions are also available (PCJ).

DRAWN CUP NEEDLE ROLLER BEARINGS

Compact and light, mainly used in applications with low loads, needle sockets represent a low-cost bearing solution; the outer ring is not machined, but is obtained using precision pressing processes. It must be noted that the geometry of the raceway depends on the geometry of the housing (the low thickness of the outer ring only provides the hardness and roughness necessary for the raceway).
Standard (HK) and heavy (HMK) series, available with or without sealing, with open or closed ends (BK, BMK)
Some dimensions are delivered with 2 rows of needles (-ZW)
Inches versions with cage (DCL, SCE) and contact needle versions (HCK).
NTN drawn cup needle roller bearing offer:

  • simplified adapting thanks to an ideal geometry
  • an improved life cycle: specific treatment of the cage and needles

NEEDLE ROLLER BEARINGS WITH SOLID RINGS

Needle roller bearings with solid rings are mainly used in applications with high loads.

• Inseparable versions: with or without an inner ring
- Series 48, 49, 59 and 69. (Series 49 is also available with simple or double sealing)
- NK series: also deliverable with the inner ring (NK+IR designation)
If the bearing is used without an inner ring, the shaft will act as a raceway and must be machined appropriately

• Separable versions: RNAO and NAO
With these versions, the inner and outer rings and the cage can be separated, opening up more assembly options.

• The inner ringsare delivered separately.
Versions with plunge grinding for seal support surfaces are also available.
These solid rings and needle bearings are also available in inch dimensions. (MR,MI)

NEEDLE AND ROLLER THRUST BEARINGS

Needle or roller thrust bearings are designed to absorb axial forces in one direction only. Support surfaces used as raceways must be ground and hardened.

  • Needle thrust bearings: type AXK11
  • Roller thrust bearings: series 811, 812, 874 and 893

Available with Polyamide cage (-T2), Aluminium alloy cage (-: lightness and enhanced performance when lack of lubricant) or pressed steel cage.


Washers:
- type AS11 washers are thin (1 mm), therefore their support surfaces must be flat and rigid enough
- types WS (centered on the shaft) and GS (centered on the housing) are more rigid

COMBINED BEARINGS

When the application requires resistance to forces combined with substantial rigidity or minimum room, the use of combined bearings can lead to benefits. Depending on the type of bearings, axial forces may be absorbed in one or two directions..

• Uni-directional axial forces
The thrust part may comprise, either:
- a radial contact (NKX) or angular contact (NKIA) ball bearing
- rollers for high axial loads (NKXR)
If the unit must be inseparable, a flange (-Z) is proposed
• Two-way axial forces
Depending on the intensity of the forces, the trust part will consist of needles (AXN) or rollers (ARN)

CAM FOLLOWERS

Cam followers are used for applications requiring guidance with minimum contact with cam and the linear guidance systems. Cam followers applications are very different to bearing applications. The cam followers is not fitted in a housing and its thicker outer ring rolls directly over a surface to provide guidance.
With or without a seal, with an outer ring with a convex or cylindrical profile, all cam followers are proposed:
- contact needle version (KRV-NATV) to accept significant loads
- cage version (KR-NATR) to accept higher speeds
Versions with two 2 rows of contact bearings also exist to increase capacity (NUTR, NUTW et NUKR)
- Stud Type: threaded shaft has a slot head or hex head screwdriver tightening system to simplify the attachment of the roller on the support surface. These rollers may be regreased by the shaft.
- Yoke Type: with or without lateral guidance

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biuro@intervito.com.pl
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