Page 57 - needle bearings

Technical Data
NTN

11.2.2 Attentive points in using Bearings with Solid Grease
11.2 Bearings with Solid Grease (1) The needle roller bearing dimension to accept
Bearings with Solid Grease means a bearing in which Bearings with Solid Grease differs every each bearing
thermal solidification type grease (mainly composed of type. Feel free to contact NTN for the detail.
lubrication grease and resin) is filled as a lubricant (2) The allowable temperature range is -20˚C to 80˚C, but
material. 60˚C and less for continuous long term running. Fully
Once this thermal solidification type grease (referred to note the operating temperature.
as Bearings with Solid Grease) was heated and cooled (3) Allowable rotational speed Fwŋn value (Fw = inscribed
down (hereinafter referred to "heat treatment"), the paste- circle diameter [mm]) ʷ (n= operating rotational
like grease hardens as much lubricant held unchanged. speed [r/min]) is differs from that in use of general
The Bearings with Solid Grease is solidified after heat grease and lubrication oil.
treatment so that the lubricant does not leak easily even Fully note this matter.
in the case wide amplitude vibration and strong centrifuge Use any needle roller bearings on Fwŋn value =
act on the bearing, thus contributing to prevention of 30,000 and less.
lubricant leak and longer bearing life. (4) For the bearings of the full pack specification,
The spot pack specification in which Bearings with minimum load equivalent to at least around 1% of the
Solid Grease was packed at multiple points on the cage basic dynamic load rating is needed for enabling the
and the full pack specification in which Bearings with rolling elements to run without slipping.
Solid Grease was nearly full-packed in the spacing (5) Bearings with Solid Grease acts as a preventive
volume of bearing are both available for the Bearings with barrier against foreign matter invading from outside,
Solid Grease. Further, the needle roller bearings are all but does not function perfectly as a seal. Therefore,
based on the full pack specification. combined use of Bearings with Solid Grease and
rubber seal is recommended particularly when high
11.2.1 Characteristics of Bearings with Solid Grease sealing performance is required.
(1) Less lubricant leak
Bearings with Solid Grease holds much lubricant 11.2.3 Application examples of Bearings with Solid
internally in bearing because it is solidified after heat Grease bearings
treatment. This lubricant is gradually fed onto the ¡Bearing for the paper feeder of a printing machine
rolling surface by heat generating from the bearing ¡Bearing for the mast roller guide of a forklift
and centrifuge, whereby lubricant leak is minimized. ¡Support bearing for the swing arm of a two-wheeled car
This serves to prevent the peripheral environment ¡Bearing for a machine tool
from being contaminated, comparing with general ¡Guide bearing for the guide unit of a press machine
lubrication greases. ¡Bearing for the link mechanism of an automatic loom
¡Bearing for the conveyor guide of a food packaging
(2) Good lubricating characteristic machine
Even when wide amplitude vibration and strong
centrifuge act on a bearing, lubricant does not leak
easily and, in addition, Bearings with Solid Grease
does not emulsify and flow out easily, because of its
solid type, even in the case of water content inflow to
bearing.
Thus, the lubricating characteristic is more excellent
than general lubrication greases.

(3) Sealing effect
Bearings with Solid Grease acts as a preventive
barrier against foreign matters (water content, dust,
etc.) invading from outside, but does not function
perfectly as a seal. Therefore, use of the contact type
rubber seal (for deep groove ball bearing, bearing
unit) or another seal (for other bearings) is
recommended particularly when high sealing
performance is required.

A-53