STRUCTURES AND TYPES OF ROLLER BEARINGS

Structure

 

Rolling bearings (abbreviated as bearings hereafter) are usually composed of casing ring (inner rings , outer rings) or tray, rolling bodies and retainer.(Fig 1)
Several rolling bodies are fitted between inner and outer rings with a definite space held by the retainer to avoid any mutual contact so that the bearings can roll very freely and swiftly.
Bearings can be classified into different types such as single-row, double-row and multi-row (triple or quandruple-row etc) according to the numbers of rows of the rolling bodies.

 

 
           Casing ring (inner ring, outer ring) and types
               The part where the rolling bodies roll is called TRAY. The surface is called tray surface. The 
            trays in the ball bearings are also called channels.
                 Generally speaking, the inner rings and the outer rings of the casing must be matched with the 
            shaft and the outer casing.
                 The trays of thrust bearings are called tray rings while the inner and outer rings are called 
            shaft ring and seat ring separately.
         Rolling bodies
            The rolling bodies can be classified into two groups with various types of roller shapes:
    
ball
cylindrical roller
long cylindrical roller
needle 
cone roller
spherical roller
 
(Lw¡Ü3Dw)
(3Dw£¼Lw£¼10Dw,Dw£¾5mm)
(3Dw£¼Lw£¼10Dw,Dw¡Ü5mm)
 
Lw:(mm)
Dw:(mm)
 
        Retainer
                Rolling bodies are surrounded and held by the retainer with definite spaces between the bodies in 
           circulardirection.
                 There are different retainers such as punched , machined , formed  and dowel . To compare with the
           fully-fitted ball (roller ) bearings, this kind of bearings with retainers are more suitable for high-speed
           rotation with less friction force.

Types

 
                  The angles between the load direction and the vertical face of the bearing center line (when the
            load is effected between casing (tray) and rolling bodies) are called contact angles which is expressed
            with ¦Á .  

 Bearings can be classified into two groups according to the different contact angles:
CENTRIPETAL BEARINGS£¨00¡Ü¦Á¡Ü450£©
.......Mainly for radical load
THRUST BEARINGS£¨450£¼¦Á¡Ü900)
......Mainly for axle load
For the classifications of the bearings , please ref to fig 2 and fig 3.
 

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