SHAANXI FORTUNE INDUSTRIES CO.,LTD. |
K304030 Bearing size 30*40*30 mm Radial Needle Roller and Cage Assemblies K30*40*30 Bearings
A needle roller bearing is a bearing which uses small cylindrical rollers.
They are used to reduce friction of a rotating surface.
Needle bearings have a large surface area that is in contact with
the bearing outer surfaces compared to ball bearings. Additionally
there is less added clearance (difference between the diameter of
the shaft and the diameter of the bearing) so they are much more
compact.
The typical structure consists of a needle cage which orients and
contains the needle rollers, the needle rollers themselves, and an
outer race (sometimes the housing itself).
Radial needle bearings are cylindrical and use rollers parallel to
the axis of the shaft. Thrust needle bearings are flat and use a
radial pattern of needles.
Full complement bearings have solid inner and outer rings and
rib-guided cylindrical rollers. Since these bearings have the
largest possible number of rolling elements, they have extremely
high radial load carrying capacity and are suitable for
particularly compact designs.
Needle bearings are heavily used in automobile components such as
rocker arm pivots, pumps, compressors, and transmissions. The drive
shaft of a rear-wheel drive vehicle typically has at least eight
needle bearings (four in each U joint) and often more if it is
particularly long, or operates on steep slopes.
Additional clarification of needle roller: According to "Marks'
Standard Handbook for Mechanical Engineers", a needle bearing is a
roller bearing with rollers whose length are at least four times
their diameter.
Needle roller bearing K series:
Model No(d*D*Bmm) | Model No(d*D*Bmm) |
K30×35×17 | K20×24×10 |
K30×37×17 | K20×24×13 |
K30×40×30 | K28*40*25 |
K32×38×20 | K20×26×12 |
K35×40×17 | K20×26×20 |
K40×45×13 | K20×28×20 |
K40×45×27 | K22×26×17 |
K40×47×20 | K24×28×10 |
K45×53×20 | K24×28×13 |
K50×55×20 | K24×30×17 |
K50×58×20 | K25×29×17 |
K50×58×25 | K25×30×17 |
K60×65×30 | K25×32×16 |
K60×68×20 | K25×33×24 |
K65×70×20 | K25×35×30 |
K65×70×30 | K28×33×13 |
K70×78×20 | K28×33×17 |
K70×78×30 | K28×33×27 |
K75×81×20 | K08×11×10 |