Track roller bearings consist of a thick-walled heavy-duty outer ring that is designed in arc shape to avoid edge stress. They can be used as pressure rollers , eccentric rollers or rocker arm rollers as well as for simple linear guidance. ZL has developed ZL-400 series of non-standard yoke type roller bearings for using on fork lift trucks. Other special designs for applications with particular requirements are also available. Series DescriptionRSTO Yoke type track rollers without axial guidance, outer ring without ribs, without inner ring,STO Yoke type track rollers without axial guidance, outer ring without ribs, with inner ring RNA22...2RS Yoke type track rollers without axial guidance, sealed on both sides, without inner ring NA22...2RS Yoke type track rollers without axial guidance, sealed on both sides, with inner ringNATR Yoke type track rollers with axial guidance by washers, gap seals, with inner ringNATV Yoke type track rollers with axial guidance by washers, full complement of needle rollers , gap seals, with inner ring NUTR...ZK Yoke type track rollers with axial guidance by the rolling elements, full complement, gap seals, with inner ring, outer ring with taperNUTR...XK Yoke type track rollers with axial guidance by the rolling elements, full complement, gap seals, with inner ring, with a cylindrical outside surfaceZL-40 Non-standard, special designed yoke type track roller bearings developed by ZL Size Range: 8mm - 50mm bore Features and Benefits of Track Roller Bearings Specially designed to withstand heavy rolling or shock loads on track type and cam controlled equipment for automotive, industrial and airframe applications Constructed from balls, rollers or an economical sector pin design Materials such as carbon steel, high alloy steel, stainless, aluminum, engineered polymers Inch or metric dimensions
Threaded, non-threaded or eccentric shafts Screwdriver slot, hexagonal socket or hexagonal shaft mountings Cylindrical or crowned outer ring profile Lubrication to accommodate varying temperature extremes Sealed or un-sealed designs and multiple coatings, platings and post treatments available for different manufacturing environments

Track rollers (also known as cam followers) are characterized thick-walled outer rings that run directly on a track . The thick outer rings permit high load-carrying capability while minimized both distribution and bending stresses. Sealed designs with internal thrust washers help extend service life under conditions of infrequent lubrication.

RSTO RSTO..X
RNA22..2RS
NATR..PP NATV..PP
NUTR
CRY...V,CRY...VUU

KR..PP KRV..PP KRE..PP KRVE..PP NUKR NUKRE
CR...R,CR,CR...UUR,CR...UU

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
NATR - PP
Plain retaining ring,axial guiding, yoke type track rollers

NATV
NATV - PP
Plain retaining ring,axial guiding, yoke type track rollers
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

ENKE 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.

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??￡-120??.When fitting the yoke type track rollers without inner rings (RNA22...2RS)series,noice 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 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 and NATV...PP type yoke type track rollers

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

NUTR type yoke type track rollers

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.

Tolerance

In common cases,the precision of the dimensions,shape and the rotation of this yoke type track roller is P0 grade.The outer diameter tolerance of the yoke type track roller with an arc outer diameter is 0￡ˉ-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'which with middle and heavy load,it is 5-7'.The yoke type track 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.

curve roller is composed of a stud used as the tray of a group of rollers and a thick wall outer ring .The shoulder of the stud and the surface retaining ring on the stud form the guiding faces on the two sides of the outer ring.When the curve rollers are running on the plain tray or cam wheel,the inner stress on the rollers will increase due to the deformation of the outer ring.Therefore the rated load should be selected as curve roller column in this operational case.

Structure

KR
Curve rollers radically guided by the retaining edge and ring

KR - PP
Curve rollers with sealing ring

KRE
Curve rollers with eccentric sleeve

KRE - PP
Curve rollers with eccentric sleeve and retaining sleeve

KRV
Curve rollers radically guided by the retaining edge and ring,Full complement needle roller type

KRV - PP
Curve rollers with sealing ring

KRVE
Curve rollers with eccentric sleeve

KRVE - PP
Curve rollers with eccentric sleeve and retaining sleeve

NUKR
Curve rollers axile guided by rolling bodies,full roller type

NUKRE
Curve rollers with eccentric sleeve

CR
Inch series curve rollers

KR and KR...PP type curve rollers

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??.

KR and KR...PP type curve rollers

KRV,KRV...PP curve rollers have the same structures as KR,KR...PP type but they are filled with needle bearings.They can be used to bear heavier load and run with lower speed.They should be lubricated very often.

NUKR type curve rollers

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 axile guidance by the rollers.

KRE,KRE...PP,KREV,KREV...PP,NUKRE type curve rollers

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

NNTR

NNTR 38110-2LS, ,NNTR 50130-2LS ,NNTR 50140-2LS ,NNTR 55140-2LS ,NNTR 60130-2LS ,NNTR 60150-2LS ,NNTR 60160-2LS ,NNTR 60165-2LS ,NNTR 65150-2LS ,NNTR 65160-2LS ,NNTR 70180-2LS ,NNTR 70190-2LS ,NNTR 80200-2LS ,NNTR 80210-2LS ,NNTR 80230-2LS ,NNTR 90220-2LS ,NNTR 90240-2LS ,NNTR 100210-2LS ,NNTR 100215-2LS ,NNTR 100240-2LS