What Are Our Concerns About Bearings（46）

Q1:What are the parameters of tapered roller bearing 30206?

A:Bearing code ：30206  

Size/d = 30  

Size/D = 62  

Size/T = 17.25  

Size/B = 16  

Size/C = 14  

Size material/E = 49.9  

Size/alpha material = 13.8  

Size/rs (min) = 1  

Size/r1s (min) = 1  

Size/r2s (min) = 0.5  

Weight (kg) material = 0.245  

Name:Tapered roller bearing (Type 30000)  

Standard: Extracted from GB/T 297-1994 refer to ISO355-1977  

Unit:(mm)  

Q2:Is there a specific standard for the dimensions of tapered roller bearings?

A:Rolling bearings — Tapered roller bearings — outline dimensions  

• Size range：  

The basic dimensions of ZWZ tapered roller bearings have been listed in the size data table.

single row tapered roller bearings: inner diameter size range: 20mm ~ 1270mm,Outer diameter size range: 40mm ~ 1465mm,width size range: 15mm ~ 240mm,

Double row tapered roller bearings:  Inner diameter size range: 38mm ~ 1560mm,Outer diameter size range: 70mm ~ 1800mm,width size range: 50mm ~ 460 mm,

Four row tapered roller bearings: inner diameter size range: 130mm ~ 1600mm.Outer diameter size range:  200mm~2000mm.width and size range: 150mm to 1150 mm  

• The tolerance： 

ZWZ metric tapered roller bearings have ordinary tolerances, and also provide grade P6X, P6, P5, P4, P2 tolerance products, all in accordance with GB307.1.  ZWZ inch taper roller bearings have ordinary tolerances, CL2, CL3, CL0, CL00 tolerances are also available on request.  Radial clearance ZWZ single row tapered roller bearings have clearance only after installation and can only be determined after adjustment by another bearing positioned in the opposite direction.  

• Cage：  

Tapered roller bearings generally use steel plate stamping, basket cage, but when the size is larger, also use car solid pillar cage.  1. When the bearing outer diameter D≤650mm, the steel plate stamping cage is used, and the rear code of the cage is not marked.  When the bearing outer diameter D>650mm, steel solid pillar cage is used, and the code for the rear cage is not marked  

• Permissible Angle error：  

Equivalent dynamic load P=Fr KN] When Fa/Fr≤ E P=0.4Fr +YFa [KN] When Fa/Fr> E single row tapered roller bearings are used in pairs (the basic external dimensions can be different), the additional axial force caused by radial load must be included in the calculation of the equivalent dynamic load of the bearing.  The additional axial force S of single-row tapered roller bearings can be approximately calculated as follows:  S= Fr/2Y equivalent static load single row tapered roller bearing P0=0.5Fr +Y0Fa KN] If P0<Fr, P0=Fr double row and four row tapered roller bearing P=0Fr +Y1Fa [KN] When Fa/Fr≤ E, P=0.67Fr  + Y2Fa [KN] when the Fa/Fr > e  

• The suffix is defined：  

A: internal structure changes B: increased contact Angle X: External dimensions using international standard CD: double outer rings, with oil holes or groover.  TD: double inner rings with taper holes. 

Q3:What are the characteristics of SKF bearings?

A:SKF ring roller bearing is a new radial roller bearing.  This compact self-aligning roller bearing was developed by SKF and launched in 1995.  Compared with the previous roller bearings, SKF ring roller bearings have a brand new change in both design and structure, making them better application performance and longer service life.

1. Design  

The bearing design is unique, which combines the self-aligning ability of spherical roller bearing and the unrestricted axial displacement ability of cylindrical roller bearing.  It can also have a small cross-sectional area, and usually needle bearings have this feature.  

This kind of bearing has a wide range of applications in radial load.  The bearings are specially used as non-positioning end bearings, and the effect is very ideal, because it combines self-aligning and axial displacement capabilities, opening up a new way to save space, reduce weight and reduce production costs.  It is possible to accurately set the radial internal clearance of the bearing by deliberately causing the relative axial displacement of the inner and outer rings.  

2. Structure:  

SKF ring roller bearings are capable of achieving the same or better performance with smaller and lighter configurations, for example in planetary gearboxes.  They simplify the bearing layout on long shafts with large temperature variations.  Vibration is also reduced when such bearings are used, for example in papermaking machinery and ventilators.  It is a single row bearing with long and slightly coronal symmetrical rollers.  The bearing raceways of the inner and outer rings are concave and symmetrically distributed around the bearing center.  Therefore, the raceway characteristics of inner and outer rings can be well combined, which is beneficial to load distribution of bearings and reduce friction.  The roller in the bearing is self-guided, that is, no matter whether the inner ring is axially displaced and/or misaligned relative to the outer ring, the roller is always in the position where the load is evenly distributed over the length of the roller.  Its load capacity is extremely high, even when angular or axial displacement has to be compensated.  In this way, the bearing layout is very reliable in operation and the service life is prolonged.  

3. Features:  

SKF ring roller bearings are commonly used as non-positioning end bearings in vibration occasions.  They are installed on the shaft by pressing, which can eliminate the friction corrosion that may be caused by the loose shaft fitting clearance, and also form a self-aligning bearing system with excellent performance and reliability.  

SKF ring roller bearings are manufactured according to the “SKF Explorer” performance grade.  SKF Explorer is a new performance class for rolling bearings, representing SKF’s knowledge in application, combined with its expertise in tribology, material development, design and manufacturing.  SKF Explorer class bearings feature very pure and homogeneous steel with only a small amount of inclusions.  

In addition, the surface treatment of all contact surfaces of SKF ring roller bearings (rolling body and raceway) has been improved to improve the effect of lubrication, and reduce vibration and noise.  Therefore, more smooth and lower temperature operation of bearings is produced, and the need for lubrication is thus reduced, and the configuration of bearings, including seals, requires less maintenance.  

Q4:Are there models for cylindrical roller bearings that do not separate inner and outer rings?

A:Yes, cylindrical roller 102 series, inner diameter 45 has 102209 102309