Needle roller bearing

Needle roller bearings are roller bearings with particularly low profile. The rolling elements resemble needles (hence the term needle bearing ), is thin and long cylindrical rollers. Needle roller bearings are commonly used because of their low space requirement in transmissions.

Types

• Needle roller and cage: a body cage with rolling bodies without outer casing
• Needle roller bearings with inner ring: only require a simple continuous wave
• Needle roller bearings without inner ring: require a hardened bearing surface on the shaft

All types are both single row (that is, with a series rolling elements ) as well as running multiple rows. In addition, there are both radial and thrust bearings and tapered roller bearings (eg in the bicycle headset ). You can only forces acting in one axis. Must both axial and radial forces are taken, two bearings are required. Further, there are combined Nadel-/Axialrillenkugellager support for axial and radial forces. Have needle roller thrust bearing due to the different scope of the two -way Wälzkörperenden a higher sliding portion (higher friction), which has an adverse effect on the wear behavior.

Compared with standard ball bearing

The advantage of needle bearing is in its low installation height and high load capacity. This is due to the as opposed to ball bearings enlarged contact surface.

A disadvantage of the needle bearing acts from that by the small size, the maximum speed is lower than the other rolling bearing types. It is also sensitive to the "wrong" - not acting in the direction of loading - Forces.

Are standardized needle bearings DIN 616 to 618 you have similarity with the cylindrical roller bearings (DIN 5412 ), but are not historically emerged from this. Needle roller bearings are therefore not be described as cylindrical roller bearings.

• Storage (technology)
• Standard part