INFONeedle bearing is a kind of roller bearing with cylindrical
roller. Compared with its diameter, the roller is thin and long.
This kind of roller is called needle roller. Although the bearing
has a small cross section, it still has a high load bearing
capacity. The needle roller bearing is equipped with thin and long
rollers (roller diameter D ≤ 5mm, L / D ≥ 2.5, l is the roller
length), so the radial structure is compact. When its inner
diameter and load capacity are the same as other types of bearings,
the outer diameter is the smallest. It is especially suitable for
the support structure with limited radial installation size. The
bearing without inner ring or needle roller and cage assembly can
be selected according to different application situations. At this
time, the journal surface and shell hole surface matched with the
bearing are directly used as the inner and outer rolling surfaces
of the bearing. In order to ensure the same load capacity and
running performance as the ring bearing, the hardness, machining
accuracy and surface quality of the shaft or shell hole raceway
surface should be similar to the raceway of the bearing ring. This
kind of bearing can only bear radial load. TYPEExcept as listed in
the standard type, it can be used for general engineering bearings,
such as: open type stamping outer ring needle roller bearing (1),
closed stamping outer ring needle bearing (2), needle roller
bearing with inner ring (3) and needle roller bearing without inner
ring / no inner race without cage needle roller bearing (4), full
needle bearing with cage and cage free (5) Drawn CupThe needle
roller bearing of the stamping outer ring is a needle roller
bearing with thin stamping forming outer ring. The main feature of
the method is that the section height is very low and the load
bearing capacity is high. It is mainly used for the bearing
configuration of compact structure, low price and bearing box hole
can not be used as roller track of needle holder assembly. The
bearing and bearing housing shall be installed in interference fit
mode. If the axial positioning functions such as shoulder and stop
ring can be omitted, the bore in the bearing box can be very simple
and economical. The needle roller bearing of the stamping outer
ring installed at the end of the shaft has two sides open type and
one side closed type. The base end face of the closed stamping
outer ring can bear little axial guiding force. The needle roller
bearing of the stamping outer ring is not attached with the inner
ring generally. In cases where the journal cannot be hardened and
ground, the inner rings listed in the table can be used. The
hardened steel plate outer ring of the needle roller bearing of the
stamping outer ring and the needle holder assembly cannot be
separated. Free space for storing lubricants can extend the
replenishment interval. Bearings are generally designed in single
row. Except for the wide range of bearings 15221622220302538 and
3038, they are equipped with two needle holder assemblies. The
bearing outer ring has a lubricating oil hole. According to the
user's needs, all single row needle roller bearings with shaft
diameter of 7mm or greater can be equipped with outer rings with
lubricating oil holes (code suffix AS1). The needle roller bearing
with oil seal stamping outer ring can provide open end or closed
end stamping outer ring needle bearing (3 to 5) when the oil seal
cannot be installed due to space limitation. These bearings are
equipped with friction oil seals of polyurethane or synthetic
rubber, which are filled with lithium-based grease with good rust
resistance and suitable for operating temperature of -20 to +100
ºC. The inner ring with oil seal bearing is 1mm wider than the
outer ring. This makes the bearing work well and avoid the shaft
from pollution when the bearing has a slight displacement from the
bearing box. The inner ring of the bearing also has lubrication
holes, which can be supplemented by the outer ring or inner ring
according to the needs of bearing configuration. Solid ferruleThe
solid ring needle roller bearing is composed of one or two ferrules
and a needle roller group with cage. According to the application,
it can be divided into bearings with or without inner rings.
Therefore, the solid ring needle roller bearing can meet the
requirements of light weight, small space and high transmission
power. The solid ring needle roller bearing has a small volume and
high bearing capacity. The structure type outer ring double stop
(or double lock ring) with cage needle roller bearing Na, NAV and
NKI type can be installed with inner ring and outer ring (with lock
ring, complete set of needle roller and cage), with high authority
speed, which can be divided into single row and double row. If the
shaft cannot be used as a raceway, such needle roller bearings with
inner rings can be used if it is impossible or economical to grind
the shaft for hardening. The features of Na and NKI bearings w
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