Cylindrical roller thrust bearings

Product Description

NEWORLD cylindrical roller thrust bearings are designed to accommodate heavy axial loads and impact loads. They must not be subjected to any radial load. The bearings are very stiff and require little axial space. (fig. 1)

Features and benefits

●  Separable design

    Shaft washer, housing washer, cylindrical roller and cage thrust assembly can be mounted separately.

●  Extended bearing service life

    To prevent stress peaks, the roller ends are relieved slightly to modify the line contact between the 

    raceway and rollers.

Designs and variants

NEWORLD supplies cylindrical roller thrust bearings in different series (fig. 2):

●  811 and 812 series bearings with one row of rollers 

They are mainly used in applications where thrust ball bearings do not have sufficient load carrying capacity.

●  893 and 894 series bearings with two rows of rollers

Bearing designs

Single direction bearings

As standard, cylindrical roller thrust bearings are available as single direction bearings and can accommodate axial loads in one direction only.

Double direction bearings

   ●  can accommodate axial loads in both directions

   ●  can be created by combining two cylindrical roller and cage thrust assemblies and two bearing 

       washers with an intermediate washer

Depending on the design, an intermediate washer can be shaft or housing centred (fig. 3).

Intermediate washers must have the same surface finish and hardness as bearing washers. NEWORLD does not supply intermediate washers, but provides material specifications and dimensional data on request.

Cylindrical roller and cage thrust assemblies

  ●  are identified by the prefix K (fig. 4)

  ●  can accommodate axial loads in one direction only

  ●  can be combined with washers in the WS, GS and LS series

  ●  can be used without washers in applications where:

      ◌  adjacent components can serve as raceways

      ◌  bearing arrangements with a low axial section height are required

Bearing washer

NEWORLD can also supply the components of cylindrical roller thrust bearings separately. ( fig. 5 ) 

Shaft washers

  ●  are identified by the prefix WS

  ●  are made of hardened carbon chromium bearing steel

  ●  have a precision-ground raceway surface

  ●  have a ground bore

Housing washers

  ●  are identified by the prefix GS

  ●  are made of hardened carbon chromium bearing steel

  ●  have a precision-ground raceway surface

  ●  have a ground outside surface

NEWORLD recommends using both of these washers in high-speed applications where accurate centring of the bearing washers is required.

LS series universal washers

  ●  can be used as both shaft or housing washers for roller and cage assemblies in the K 811 series

  ●  are used for applications where accurate centring of the bearing washers is not necessary

  ●  are used where low speeds are involved

For additional information about LS series washers, refer to Needle roller thrust bearings.

Cages

Cages

NEWORLD cylindrical roller thrust bearings are fitted with one of the cages shown in table 1.

When used at high temperatures, some lubricants can have a detrimental effect on polyamide cages. 

●  Used in applications with heavy axial loads and no radial load

●  High shock load resistance

●  Often used in the differential, due to high stiffness and small axial dimensions

●  Bearing components can be mounted individually

●  Custom designs available

Temperature limits

The permissible operating temperature for cylindrical roller thrust bearings can be limited by:

●  the dimensional stability of the bearing washers and rollers

●  the cage

●  the lubricant

Where temperatures outside the permissible range are expected, contact NEWORLD.

Bearing washers and rollers

The bearings are heat stabilized up to at least 120 °C (250 °F).

Cages

Brass cages can be used at the same operating temperatures as the bearing washers and rollers.

Permissible speed

The speed ratings in the data table indicate:

●   the reference speed, which enables a quick assessment of the speed capabilities from a thermal frame 

     of reference

●   the limiting speed, which is a mechanical limit that should not be exceeded unless the bearing design 

     and the application are adapted for higher speeds

Design considerations

Abutment dimensions

Abutment dimensions should fulfill the following:

  ●   Support surfaces in housings and on shafts should be at right angles to the shaft axis and provide 

       uninterrupted support over the entire washer face.

  ●   The abutment diameter on the shaft should be ≥ da min and in the housing ≤ Da max (fig. 6). Values 

       for da min and Da max are listed in the data table.

  ●  Shafts and housings should be manufactured to suitable tolerance classes (table 4) to provide 

      satisfactory radial guidance for the individual thrust bearing components.

      ◌    Housing centred washers require a radial gap between the shaft and washer bore.

      ◌    Shaft centred washers require a radial gap between the washer and the housing bore.

Cylindrical roller and cage thrust assemblies are generally centred radially by the shaft to reduce the circumferential speed at which the cage slides against the guiding surface. This is particularly important for higher-speed applications. The guiding surface should be ground.

Raceways on shafts and in housings

●   should have the same hardness, surface finish and axial run-out as a bearing washer, if the load 

     carrying capacity of a cylindrical roller and cage thrust assembly is to be fully exploited

●   should be designed using the dimensions Ea and Eb , which take radial displacement of the roller set 

     into consideration

Application

Application:

●  Aggregate

●  Machine Tool

●  Metals, Oil

●  Power Generation

●  Cone crushers

● Crane hooks

● Oil well swivels

● Extruders

● pulverizer drives

● Rolling machine tool spindles & tables

● Drilling rig hydraulic heads

● Gear boxes

● Pre-heater fans 

● Mill roll necks