|
 Roller
or needle roller which look common
is very important for vehicles on
speed so that its quality is crucial
for its performance.
Since founded in the
beginning of 1992, Tongda has been
considering high quality and new
technology as key to development of
enterprise. The company has passed
ISO-9002 certification issued by
Shanghai Quality System Auditing
Center upon requirements of modern
quality management.
During the past
several years, Tongda had
concentrated on R&D of high-precise
turbine error detector of
cylindrical roller type TDW-135,
which approved by national
authority. Technical index of
rollers & needle rollers type
TDF-310 has reached international
level and has been successfully
applied to detect error and sort
rollers & needle rollers of bearings
on high-precision sorter of vehicle.
The enterprise could
provide various high-precision
needle roller series G2, G3,
cylindrical roller series II, III
and bearing roller type III, kinds
of overall crowned, relieved end,
variant-curvature cylindrical roller
and needle roller according to user
requirements.
Tongda owns enough
technology strength to take
manufacturing and process of various
rollers & needle rollers, such as
straight generatrix type, overall
crowned type, arc slope type,
relieved end type and advanced
variant crowned rollers & needle
rollers.
 The
drawing indicates stress
distribution under condition of
light load, medium load and
eccentric load when generatrix of
roller & needle roller appears in
different curve.
Apparently, the
concentration of stress per relieved
end curve improves effectively
because of round transition between
arc slope and straight generatrix.
So the lifespan of this roller &
needle roller will extend a lot. In
recent years, the company has
developed roller & needle roller
with logarithm curve generatrix
(variant crowned type) whose
precision index of each technology
equals to international advanced
level. The experts indicate that the
lifespan of variant crowned roller &
needle roller could be increased by
several times because of evener
stress distribution, normally 2 to 3
times longer.
The surface process
of high-precision cylindrical roller
& needle roller adopts crowned
super-precision technology. The
roughness of surface will decrease
and round deviation will be improved
and cross net remained will make
surface reserve oil film for coating
after super-precision treatment so
as to reduce noise and vibration of
bearing for longer lifespan and to
improve performance.
Bearing assembly
factory could select production
according to requirement of
designer, or consult with our
professional engineers and
technologists of technique
department then choose suitable
rollers & needle rollers as well.
|
Light Load |
Medium Load |
Eccentric Load |
Working Section |
|
niedrige last |
hohe last |
hohe last +
schiefstellung |
 |
Straight
Generatrix |
 |
Overall Crowned
Type |
 |
Arc Slope Type |
 |
Relieved End Type |
|
