What Are Our Concerns About Bearings（29）

Q1: What are the models of bolt roller needle roller bearings of Enke bearings?

A:Bolt-type needle roller bearings  

Main structural forms:  

Bearing code structure characteristics  

The KR has a cage suffix “X” denoting a cylindrical outer surface, e.g. KR16 X  

KR..   PP has cage with sealing ring  

KRV is fully loaded with rolling needles  

KRV..  PP fully loaded needle roller with sealing ring  

NUKR is fully loaded with cylindrical rollers  

NUKRE full loaded cylindrical roller with eccentric sleeve  

The CR British system has a cage  

CR ..  UU inch system has cage with sealing ring  

CRV…   British no cage  

CRV…  UU British system without cage with sealing ring  

CRY…  V  

CRY…  VUU  

KRE means with eccentric sleeve, with cage  

KRVE means with eccentric sleeve, full load type  

One, no axial  

Bearing code structure characteristics  

The outer ring of RSTO has no guard edge, cage and arc rolling surface  

RSTO..  X Cylindrical roller without sealing and inner ring  

STO outer ring without retaining edge, cage, arc rolling surface  

STO..  X Double-sided sealing, cylindrical rolling surface without inner ring  

RNA22..  2RS outer ring double guard edge, cage, arc rolling surface  

RNA22..  2RS X Double sided sealed, cylindrical roller with inner ring  

NA22..  2RS outer ring double guard edge, with cage arc rolling surface  

NA22..  2RS X Double sided sealed, cylindrical roller with inner ring  

Two, there is axial  

Bearing code structure characteristics  

NATR has a cage with an inner ring arc or cylindrical surface  

NATR..  PP has a cage with an inner ring arc surface or cylindrical surface  

NATV full – mounted rolling needles have inner ring arc-shaped or cylindrical rolling surface  

NATV..  PP fully loaded rolling needle with inner ring arc or cylindrical rolling surface  

The NUTR full cylindrical roller has an inner ring curved surface  

NUTR..  X full cylindrical roller with inner ring cylindrical roller  

 Model (mm) Unsealed cylindrical outer wheel CF5 CF6 CF8 CF10 CF10-1 CF12 CF12-1 CF16 CF18 CF20 CF20-1 CF24 CF24-1 CF30 CF30-1 CF30-2  

Spherical outer wheel CF5R CF6R CF8R CF10R CF10-1R CF12R CF12-1R CF16R CF18R CF20R CF20-1r CF24R CF24-1R CF30R CF30-1R CF30-2R  

There is a sealed cylindrical outer wheel CF

5UU CF 6UU CF 8UU CF 10UU CF 10-1UU CF 12UU CF

12-1UU CF 16UU CF 18UU CF 20UU CF 20-1UU CF

24UU CF 24-1UU CF 30UU CF 30-1UU CF 30-2UU

Spherical outer wheel CF

5UUR CF 6UUR CF 8UUR CF 10UUR CF 10-1UUR CF

12UUR CF 12-1UUR CF 16UUR CF 18UUR CF

20UUR CF 20-1UUR CF 24UUR CF 24-1UUR CF

30UUR CF 30-1UUR CF 30-2UUR

The bolts of the curve roller as raceway are hardened. To avoid stress concentration, the outer surface of the thick-walled outer ring of the roller is curved. Curve roller with single, double sealing ring, no sealing ring, with sealing ring of various specifications of the model. With sealing ring storage grease space, provide long-term lubrication, and prolong the lubrication interval. The sealing ring is made of N220 or PTFE and operates at temperatures ranging from -30°C to +100°C or -30°C to +180°C, respectively. Close-packed curved roller it can withstand heavy loads but at low speeds and must be relubricated frequently.

The supporting roller has a thick-walled outer ring. With this outer ring, the roller can roll directly on the raceway and can withstand large loads. VG- Supporting roller has pressure roller, eccentric roller, rocker roller. The outer diameter of the roller is cylindrical or spherical. The inclined position can be compensated by using the spherical outer ring.

RSTO and STO type supporting roller

Vg-series supporting roller RSTO type without inner ring, supporting roller can run directly on hardened shaft as raceway. STO type with inner ring, inner ring and outer ring and their matching needle holder assembly can be mounted separately. Because the RSTO and STO type supporting rollers do not have a retaining edge and end face retaining ring, the installation must be axial, its surface is at least after precision machining.

RNA22… 2RS,NA22… Model 2RS supporting roller

The diameter of the roller is the same as STO series. However, they are slightly wider, with a double-sided seal that requires no maintenance and a range of temperatures from -20 ° C to 120 ° C. In mounting RNA22 without inner ring… 2RS series should be careful not to damage the sealing ring when supporting the roller. The outer ring needs the end face.

NATR and NATR… PP type supporting roller

NATR series supporting roller comprises an outer ring, an inner ring, a needle holder assembly and a retaining ring pressed into and fixed on both sides of the inner ring. NATR… The PP series also has an additional seal ring. This kind of supporting roller has large grease storage space and can be used for a long time without adding grease.

NATV and NATV… PP type supporting roller

NATV series supporting rollers and NATR series supporting rollers are basically the same, the only difference is that NATV series is fully loaded needle type. Therefore, it can bear heavy loads at low speeds, but it must be lubricated frequently. NATV… PP series are of sealed structure.

NUTR type supporting roller

NUTR series supporting rollers are double row full roller bearings with outer rings fender. All parts of the bearing are formed by the sealing cover pressed into the outer ring to form a complete unit. The sealing cover and the thrust ring together form an efficient clearance seal. The supporting roller can withstand very heavy loads and, due to the axial orientation of the rolling body, can withstand impact axial loads even at high speeds.

The tolerance

VG- Supporting Roller The size, shape and rotation accuracy of the roller is normally P0. The tolerance of bearing width of NATR, NATV and NUTR is H12, and the tolerance of bearing diameter of curved roller stud is H7.

Adjustable concentric

The supporting roller with cylindrical outer diameter has very little adjustable centrality. It is about 3-4′ at low load and 5-7′ at moderate to high load. The supporting roller with rounded outer diameter has adjustable centrality of 15-20′. When there is a large Angle error, there is significant edge stress according to the size of the load, which will reduce the life of the bearing.

KR and KR… PP type curve roller

In KR, KR… Inside the PP curve roller, the needle roller is provided with a cage, and the outer ring is axial through the retaining ring on the bolt. Suitable for heavy load and medium speed. Because there is more grease storage space inside the bearing, the lubrication cycle is prolonged. KR… PP curve roller with contact sealing structure. The operating temperature is -30℃-100℃.

KR and KR… PP type curve roller

KRV and KRV… KRV and KRV… PP type curve rollers

KRV and KRV… PP curve roller and KR, KR… PP curve rollers have the same structure except that they are fully loaded needle roller bearings. They can withstand heavier loads and lower rotational speeds. Grease must be added frequently.

NUKR curve roller

This series of curve rollers are of double row full – loaded roller construction. A high effect clearance seal is composed of a housing and a guard step with an outer ring that is axially pressed into the outer ring by a rolling body like a circular column roller bearing.

This type of curvilinear roller can withstand exceptionally high loads, as well as impact axial loads due to the axial direction of the roller.

KRE, KRE… PP, KREV, KREV… PP, NUKRE type curve roller

All models of curve rollers can be supplied with eccentric sleeve. The roller can be adjusted through the groove on the bolt face. The high point of eccentric sleeve is indicated at the mark “HSB” on the end face of the bolt. Grease can be added through both ends of the bolt.