RTL series 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. Because RSTO and STO type yoke type track rollers have no retaining edges and the end retaining
        rings, axial guiding is needed in fitting . the guiding surface must be precisely machined at least.

               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℃?20℃. 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 series roller contains outer ring, inner ring , needle retainer assembly and the retaining rings which 
        are pressed 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 series yoke type track roller is basically the same as NATR series.The only difference is that NATV is
        full complement needle roller type. Therefore it can sustain heavier load under low speed. Frequent lubricating sh-
        ould be noticed. NATV...PP is a series with sealing ring structure.

　　　　　　　　NUTR series yoke type track roller is double 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 , together 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.

　　　　　　　　In common cases, the precision of the  dimensions , shape and the rotation of this yoke type track roller is
　　　　 Po grade. The outer diameter tolerance of the yoke type track roller with an arc outer diameter is 0/-0.05mm　, the
　　　　 width tolerance of NATR, NATV , NUTR bearings is h12.

　　　　　　　　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.

             When the yoke type 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 rollers will 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 combin-
         ation of the shaft is required, the recommended shaft tolerances are as follows:

                In KR , KR..PP curve rollers , the rolling needles are guided by the retainer while the outer ring is 
          guided by the retaining ring shaft on the stud . These rollers are suitable for heave load and middle speed
          revolution.The lubricating can last a long period due to the bigger grease storage space inside the bearing.
          KR...PP curve roller is of contacting sealing structure. The operational temperature is -30℃-100℃.

             This series curve rollers are of double lines full - roller structure . Like all cylindrical roller bearings ,
       they are composed of outer ring cages pressed in the rolling bodies axle guidance and the retaining edge steps which
       forms highly effective gap sealing.
             Especially heavy load can be borne by these rollers and also they can sustain the axile load impact due to the
      ile guidance by the rollers.

          Curve rollers of all these types can be supplied with eccentric sleeve . The rollers can be adjusted by adjusting
      he stud end face.The top of the eccentric sleeve is situated at the place where RTL is marked. Lubricating grease can
      be made through the both ends of the stud.

        The dimensional tolerance and rotation precision of the standard bearing out ring is PO grade which is not appli-
      cable to the arc shaped surface with tolerance  0/-0.05mm. The diameter tolerance of the stud is h7. 

         When mounting the curve rollers,attention must be given to the combination between the stud and hole.There should
    be no gaps. The tolerances of the combinative hole are recommended as H7. There must be a small chamfered angle in the
    combinative hole on the shaft to achieve the best support face.Anti-loosen measures must be taken for the clamping st-
    ud. No hammer striking on the retaining edge of the stud is permitted in fitting.The groove on the top of the stud and
    be used to tighten the rollers with suitable tools or to adjust the positions of the eccentric sleeves . The oil holes
    on the stud tray should be located in the non load area which is marked on the top of the stud retaining edge with "RTL"