Double row self aligning ball bearing

Product reference: 2205-EB

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Dimensions Basic Load Rating Limiting speed
Dynamic Static Grease
Bearing No. d1 D B rsmin B1 d2 B2 KN rpm
2205 K-2RS-TN + H305 20 52 18 1 29 38 8 12,5 3,45 7000
2206 K-2RS-TN + H306 25 62 20 1 31 45 8 15,7 4,7 5300
2207 K-2RS-TN + H307 30 72 23 1,1 35 52 9 16 5,2 5600
2208 K-2RS-TN + H308 35 80 23 1,1 36 58 10 19 6,5 4800
2209 K-2RS-TN + H309 40 85 23 1,1 39 65 11 22 7,5 4500
2210 K-2RS-TN + H310 45 90 23 1,1 42 70 12 22,9 8,1 4000
2211 K-2RS-TN + H311 50 100 25 1,5 45 75 12 25 9,6 4800
2212 K-2RS-TN + H312 55 110 28 1,5 47 80 13 30 11,2 4300
2213 K-2RS-TN + H313 60 120 31 1,5 50 85 14 32,5 12,5 4000
2215 K-2RS-TN + H315 65 130 31 1,5 55 98 15 42.5 15 4500 
2216 K-2RS-TN + H316 70 140 33 2 59 105 17 45 17.5 4000 
2217 K-2RS-TN + H317 75 150 36 2 63 110 18 55 22 3800 
2218 K-2RS-TN + H318 80 160 40 2 65 120 18 68 25 3600 
2219 K-2RS-TN + H319 85 170 43 2,1 68 125 19 80 30 3400 
2220 K-2RS-TN + H320 90 180 46 2,1 71 130 20 90 35 3200 

WHY SELF-ALIGNING DOUBLE ROW BALL BEARINGS?

Self-Aligning Double Row Ball Bearings

Self-Aligning Double Row Ball Bearings are designed to work in applications where severe misalignment exists whether from mounting or shaft deflection.  The concave raceway of the outer ring in combination with two rows of balls operate over a wide range of contact angles.  Furthermore it aligns itself correctly with the shaft and assembly without causing undue stress on the rest of the bearing assembly.

Standard Self-Aligning Double Row Ball Bearings are produced with straight bores; however, tapered bores are available upon request.  Noteworthy is that the self-aligning ball bearing has the lowest friction of all rolling bearings, which enables it to run cooler even at high speeds.  Furthermore, the design allows for easy mounting and dismounting.

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2-RS SEALS

Both he bearing housing and the bearing it self are sealed.
the bearing insert is lifetime greased.
Greasing is using to drift pollution from the seals and prevent intrusion of water.

Standard is Extreme Bearing using a sealed bearing but when is needing a wider misalignment, a bearing without 2rs seals is recommended

Permissible angular misalignment  = 1,5 degrees

Permissible angular misalignment whitout  2rs seals = 2,5 degrees

Double Row Self-Aligning Ball Bearings 

This design of bearing utilizes two rows of balls, with the inner ring having two deep groove raceways and the outer ring a single continuous spherical raceway. This permits the inner and outer ring to be misaligned relative to each other through a comparatively large angle without imposing moment loads upon the balls. This bearing is frequently used when the inner ring is to be mounted upon an adapter sleeve or when conditions in the machine make it difficult to assure accurate alignment of the inner and outer rings. Due to the small contact angle, the thrust capacity of these bearings is limited.

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Axial loading capacity

Axial load ratio of bearings mounted with adapter sleeves.

When mounting double row spherical roller bearings to a shaft using adapter sleeves the axial load rating depends on the friction between the shaft and the adapter sleeve. For the properly installed bearings the acceptable axial load can be calculated as follows:

Fap   =  0.003  ·  B  ·  d1

Fap = maximum permissible axial loading capacity  [kN]

B    = bearing   width  [mm] 

d1  =  bearing bore diameter [mm]

Minium Load

In order to provide satisfactory operation, double row angular contact ball bearings, like all ball and roller bearings, must always be subjected to a given minimum load, particularly if they are to operate at high speeds or are subjected to high accelerations or rapid changes in the direction of load. Under such conditions the inertia forces of the balls and cages, and the friction in the lubricant, can have a detrimental influence on the rolling conditions in the bearing arrangement and may cause damaging sliding movements to occur between the balls and raceways.
The requisite minimum radial load to be applied to double row angular contact ball bearings can be estimated using

where

Frm

=

minimum radial load [kN]

kr

=

minimum radial load factor (see product table)

ν

=

oil viscosity at operating temperature [mm2/s]

n

=

rotational speed [r/min]

dm

=

mean bearing diameter

= 0,5 (d+D) [mm]

when starting up at low temperatures or when the lubricant is highly viscous, even greater minimum loads may be required. The weight of the components supported by the bearing, together with external forces, generally exceed the requisite minimum load. If this is not the case, the double row angular contact ball bearing must be subjected to an additional radial load.all bearings can be estimated using

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