Inner ring

from Wikipedia, the free encyclopedia

The inner ring is the component of a rolling bearing that sits directly on the shaft .

Inner rings for standard bearings are only available in common bore diameters. The last 2 digits of the abbreviation indicate the inside diameter (d). From d = 20 mm, the following applies: The last two digits of the abbreviation multiplied by 5 result in the inner diameter. Example: a deep groove ball bearing 6205 has an inner ring with the diameter "05" * 5 = 25 mm.

The standard deep groove ball bearing has grooves milled into the outside of the inner ring to accommodate the bearing balls . This is good and cheap for many applications. It can absorb radial forces ("from above"), achieve very high speeds and, to a limited extent, also withstand sufficiently high axial forces ("from the left and right, via the shaft"). Larger deep groove ball bearings can be axially loaded up to half of the radial, static load rating ; the value is given in the manufacturer's bearing tables.

The inner ring is modified to cover special requirements.

This article or section needs to be revised. Details should be given on the talk page. Please help to improve it , and then remove this flag.

  • Angular contact ball bearings and spindle bearings have, among other things, a specially shaped inner ring. In this way, they can absorb very high axial loads on one side.
  • Cylindrical roller bearings have an inner ring that can be removed on one side, on both sides or not at all , depending on their use as a fixed or floating bearing . For this purpose, shelves are attached to the outer sides of the inner ring, which prevent it from being pulled out to the left or right.
  • Extra-wide inner rings are z. B. intended for radial insert ball bearings .
  • Vibrating sieve bearings have specially hardened inner rings that are extremely resistant to vibrations.

Some roller bearings can do without an inner ring, for example cylindrical roller bearings with the abbreviation RNU .. or needle roller bearings RNA. Here the rolling elements run directly on the shaft , which has to be specially machined (hardened, ground). These bearings without an inner ring are often used due to a lack of space, particularly in vintage car transmissions and engines.

In the case of tapered roller bearings, the inner ring (cup) can often be purchased individually, especially for large bearings.