KR

Technical characteristics

VEO  cam followers have an internal design very similar to that of a needle or cylindrical roller bearing.They are characterized by a thick walled outer ring that enables them to accommodate

shock loads while reducingdistortion and bending stresses.The outside running surface is crowned as standard.

However,cam   followers   with   cylindrical(flat) running surfaces are available for certain appli- cations.Instead of an inner ring,cam followers have a solid stud(pin)that is threaded so that the

cam follower can be quickly and easily attached to appropriate machine components by means of a hexagonal nut.

Axial guidance for the outer ring is provided by an integral flange at the head ofthe stud and a flange ring pressed onto the stud,or by the roller complement.

Cam followers are pre-greased ready-to-mount units that are suitable for all types of cam drives, tracks and conveyor systems.

VEO cam followers are available in three different  designs:

·KR design

·NUKR design 

·PWKR design

All three designs of cam followers have the same main dimensions.The differences arein their in-ternal design,which make them suitable for va- rious operating conditions.

All designs are available with a concentric seat or aneccentric collar,which is shrunk onto the stud, enables less stringent manufacturing tolerances to be specified for associated

components.The values  for  the  adjustable  eccentricity  are  listed in the product tables.

Tolerances

VEO  supplies  cam  followers  to  normal,PN,tole- rances inaccordance with  ISO standards.Excep- tions are :

· the tolerance of the outside diameter running surface with modified profile (0/-0,050 mm)

· the stud shank diameter tolerance (h7)

· the  eccentric  collar  diameter  tolerance(h9)

Internal radial clearance

VEO supplies cam followers with a radial internal clearance as specified for corresponding needle   roller   bearings   and   cylindrical   roller   bearings   with C2 radial internal clearance.

Load carrying capacity

Compared  to  a  typical  rollingbearing,where  the outer ring is fully supported in a housing,a cam follower has only a small contact area between its outside running surface and the track.

The actual contact area dependson the applied radial  load  and  whether  the  running  surface  is crowned  or  flat.The  deformation  of  the   outer ring,caused   by   this   limited  

contact,alters   the force  distribution  in  the  bearing,which  affects load carrying capacity.The basic load ratings lis- ted in the product tables take this into account.

The ability to accommodate dynamic loads de- pends on the  requisite  life,butit  is  alsoimpor- tant to consider the strength of the outer ring, therefore,the value of the  maximum dynamic

radial load F should not beexceeded.

The permissible static load for a cam follower is determined by the smaller of the values Foand C 。.If requirements for smooth running are below normal,the static load may exceed C,but

should never exceed the maximum permissible static ra- dial load F

Abutment and fillet dimensions

The bearing inner ring must contact adjacent surfaces with their side faces only.The radius of inner ring corners must not touch the fillet radius of shaft shoulder.

Therefore,the  largest  fillet  radius(rg)must  be smaller than the minimum fillet dimension of the Support roller inner rings(rs)as listed in the pro-duct tables.