SLS bearing

Explanation for Yoke Type Track Roller

YOKE TYPE TRACK ROLLERS
Yoke type track rollers with thick wall outer ring can roll directly on the tray under
heavy load.It includes pressure roller, eccentric roller,rocking arm roller. The roller
diameter is of ball shape or cylinder ball shape. With the ball shape , the inclining
position resulted during the fitting can be compensated.

Structure

RSTO	No retaining edge in outer ring, yoke type track rollers without inner ring
STO	No retaining edge in outer ring , yoke type track rollers with inner ring
RNA22...2RS	Double face sealed, yoke type track rollers without inner ring
NA22...2RS	Double face sealed, yoke type track rollers with inner ring
NATR	Plain retaining ring, axial guiding, yoke type track rollers
NATR...PP
NATV	Plain retaining ring,axial guiding,yoke type track rollers,
NATV...PP	full complement needle roller type
NUTR	Rolling body guiding, yoke type track rollers , full roller type
CRY	Inch system, plain retaining ring, axial guiding, yoke type track rollers

RSTO and STO type yoke type track rollers

Yoke type track rollers RSTO type, without inner ring,can directly run on the quenched shaft. STO type has inner

rings, its inner ring , outer ring and the combinative needle roller retainer assembly can be fitted separately. Bec-

ause RSTO and STO type yoke type track rollers have no retaining edges and the end retaining rings,axial guid-

ing is needed in fitting.The guiding surface must be precisely machined at least.

RNA22...2RS, NA22...2RS type yoke type track rollers

The diameter of such rollers is the same as STO series rollers but a little wider . Its double face sealed structure

ensures no maintenance requested. The operational temperature range is -20^oC-20^oC. When fitting the yoke type

track rollers without inner rings(RNA22..2RS)series,notice no damage to the sealing rings should occur.The outer

ring needs end face guidance.

NATR and NATR..PP type yoke type track rollers

NATR series roller contains outer ring , inner ring , needle retainer assembly and the retaining rings which are pr-

essed and fixed by the two sides of inner ring.NATR...PP series has an additional sealing ring. This kind of yoke

type track rollers have huge lubricant storage space , so they can be used for long period without re-grease.

NATV and NATV...PP type yoke type track rollers

NATVseriesyoketype track roller is basically the same as NATR series . The only difference is that NATV is

full complement needleroller type . Therefore it cansustain heavier load under low speed . Frequent lubricating

should be noticed. NATV...PP is a series with sealing ring structure.

NUTR type yoke type track rollers

NUTR series yoke type track roller isdouble row full roller bearing with retaining edge guiding outer ring . All the

parts of the bearing are pressed into the sealing cage of outer ring forming a complete unit, the sealing cage , to-

gether with the thrust retaining ring form an efficient gap sealing. Very heavy load can be used on this yoke type

track rollers.Even with very high speed, it can bear impact axle load due to its axle guidance of its rolling bodies.

THE TOLERANCE OF Yoke Type Track Roller

Incommon cases , theprecision of the dimensions , shape and the rotation of this yoke type track roller is Po

grade . The outer diameter toleranceofthe yoke type track roller with an arc outer diameter is 0/-0.05mm , the

width tolerance of NATR, NATV , NUTR bearings is h12.

Center adjustability

The yoke type track roller with diameter of cylindrical shape have very small center adjustability . With low load,

the center adjustability is 3-4'while with middle and heavy load,it is 5-7' The yoke type track rollers with diameter

of arc shape have a center adjustability of 15-20' For bigger angle variation, the edge effect will increase with the

different loads. This will decrease the life of the bearing.

Application and mounting

Whenthe yoketype track rollers are fitted into a bearing cage in combination as the rolling bearings , the load

selection will be in the "basic rated load" When the outer ring is directly supported on the tray,the radical load of

the yoke type track rollerswill cause the elastic deformation of the outer ring . Thus the load distribution will be

changed, the peak load will be increase while the dynamic and stable load capacity will decrease, At this time,

selection of "being as yoke type track rollers"column will be suitable.

In general cases ,the load on the yoke type track rollers inner ring is partial load .So no tight combination of the

shaft is required, the recommended shaft tolerances are as follows:

In fitting yoke type track rollers, the oil hole must be situated in the non-load area.