Exploring the Structure of single-Row cylindrical Roller Bearings

For single row CRB, rollers are   always guided by solid rib. Ring with rib, cylindrical roller and cage are   separable to another ring. This is convenient for installation and   un-installation especially two rings are interference fitting per load   situation. Single row CRB is ok for heavy radial load and high speed.

NU Structure: 

NU outer ring has two solid rib and inner ring doesn’t have. The shaft can move   bi-direction axially against housing. So this NU is for non-fixed end   bearing. 

N structure:

inner   ring has two solid ribs and outer ring doesn’t have. The shaft can move bi-direction axially   against housing. So it is for non-fixed end bearing. 

NJ structure: 

Outer   ring has two solid ribs and inner ring has one. So this is for one direction   axial positioning.

NUP structure:

outer   ring has two solid ribs, inner ring has one solid rib and one non-integrated   rib with loose fit. This is ok for fixed end bearing, and can position the   shaft in two direction axially.

NUB structure:

outer   ring has two solid ribs, inner ring doesn’t have ribs but two sides protrudes to outer ring. The   shaft can move bi-direction axially against housing. This for non-fixed end   bearing.

NB structure: 

inner   ring has two solid ribs, outer ring doesn’t have ribs but both sides protrude. The shaft can   move bi-direction axially against housing. This for non-fixed end bearing.

NJP structure: 

outer   ring has two solid ribs, inner ring has one loose fit rib ring. This is for   one direction shaft positioning. 

NJF structure:

inner   ring and outer ring both has one solid rib. This is for one direction shaft   positioning.

NF structure:

inner   ring has two solid ribs and outer ring has one. This is for one direction   shaft positioning.

NFP structure: 

same   like NF structure, but outer ring has one loose fit rib ring not integrated   rib.

NP structure:

inner   ring has two solid ribs and outer ring has one solid rib and loose fit rib   ring. This is for both direction shaft positioning axially.

RNU structure: if the shaft can be   quenched and ground, then it is better to use RNU bearing outer ring has two   solid ribs together with roller and cage. Without inner ring, bigger shaft   diameter is possible and increase rigidity, moreover the shaft displacement   against housing is only limited by the raceway width. If raceway made with   right dimension and shape accuracy, then we can see good running accuracy.   RNU can be offered with special requirement.

RN Structure: RN has no outer ring.   This structure is for high load capability and limited space if housing can   be quenched and ground to work as raceway. One typical application is   planetary gear support. RN can be offered with special requirement.

Retaining Ring: HJ retaining ring is designed to position NU and NJ type CRB. We will   use this retaining ring for heavy load application, but not NUP type CRB   because full width inner ring of NU and NJ type CRB can offer more steady   support than narrower NUP type.

NU+HJ structure: we can use NU and HJ to position shaft in one direction, and corresponds   to NJ type. It is not permitted to install two HJ retaining ring at both   sides of inner ring because this will possible cause roller gets stuck.

NJ+HJ structure: NJ and HJ type together can act   as positioning bearing for shaft positioning in both direction axially.

Full complement single row CRB

This   kind of with full complement bearing rollers are guided by ribs. Full   complement CRB has very high load capability and rigidity because fill in as   more as possible rollers.  Limited to kinematics situation, their limit   speed is not as high as cage bearing. It is for half-positioning bearing. It   is designed inner ring with two ribs, outer ring with single rib and flat   retaining ring and full complement rollers. The distance bearing can move   axially decided by the gap between roller end and retaining ring.

Disc type cage CRB

This   brass disc type cage avoids roller contact. This design is in between full   complement bearing and caged bearing design. Roller guided by outer ring   stiff rib. Inner ring is separable, and can install inner ring and outer ring   respectively. It can be used as half-positioning bearing. Outer ring is   radial split, and will be connected by ring-like snap ring during   installation. Inner ring is with sing rib. Roller is longer and bigger, then   increase load capability dramatically. Cage is disc type with unique design   and thinking compare with traditional disc type cage.

Split single row CRB: according to requirement,   design split bearing for fixed end and non-fixed end. This will be used with   housing and have advantage from installation and seal.