Four-point contact bearings are single-row angular contact ball bearings and therefore require significantly less space in an axial direction than double-row designs. The bearings comprise solid outer rings, split inner rings and ball and cage assemblies with brass or polyamide cages.
What are contact bearings?
Angular contact ball bearings have inner and outer ring raceways that are displaced relative to each other in the direction of the bearing axis. This means that these bearings are designed to accommodate combined loads, i.e. simultaneously acting radial and axial loads.
Where are contact bearings used?
Angular contact bearings are ideal for use in gearboxes, pumps, electric motors, and clutches or other high-speed applications. They are commonly used in the Materials Handling, Machine Tool, Steel Mill, and Wind Energy industries.Oct 6, 2014
What is QJ bearing?
Standard SKF four-point contact ball bearings – also called QJ bearings – consist of a single piece outer ring, a radially split inner ring, a ball set and an outer ring guided cage. ... The outer ring is similar to a deep groove ball bearing design, but the raceway geometry cross section is fairly different.Jun 25, 2015
What does V stand for in bearings?
2). In applications where there are axial loads in both directions, the “V-shaped” marking should point in the direction of the heavier of the two loads. Section navigation. Angular contact ball bearings. Product table: Angular contact ball bearings, super-precision.
How do you identify different bearings?
The first digit indicates the width or height series (dimensions B, T or H). The second digit identifies the diameter series (dimension D). The last two digits of the basic designation identify the size code of the bearing bore. The size code multiplied by 5 gives the bore diameter (d) in mm.
How many types of bearings are there in a car?
Here, we'll look at the 6 most popular types: plain bearings, rolling element bearings, jewel bearings, fluid bearings, magnetic bearings, and flexure bearings.
What is contact angle in ball bearing?
The contact angle is defined as the angle between the line joining the points of contact of the ball and the raceways in the radial plane, along which the combined load is transmitted from one raceway to another, and a line perpendicular to the bearing axis (fig. 1).
What are the characteristics of an angular contact bearings?
Angular contact ball bearings are designed to support combined radial and thrust loads or heavy thrust loads depending on the contact angle magnitude. The bearings having large contact angles can support heavier thrust loads. They are suitable for a wide range of applications including high speed machine tool spindles.
Why is angular contact bearing used in pair?
A single row angular contact ball bearing can accommodate axial loading in one direction only. ... To counteract the axial load, these bearings are must be fitted in pairs. Normally three types of pairs are made: face to face, and tandem and back to back. 17.14.
Which is the point contact bearing?
Four point contact bearings are single row, non self-retaining radial ball bearings. They are similar in their structure to single row radial angular contact ball bearings; the raceways on the inner rings are, however, designed such that they can support axial loads in both directions ➤ Figure and ➤ section.
What does angular contact bearing mean?
Definition. Angular contact bearings refer to a type of bearings that support both radial and axial loads. Examples of these bearings are angular contact ball bearings and tapered roller bearings.
What is the difference between angular contact bearing and ball bearing?
The difference between these and deep groove ball bearings is that the bearing cross-section is designed asymmetrically. Angular contact ball bearings are designed to support loads whose line of application is not perpendicular to the bearing axis but rather at a certain angle to the perpendicular axis (contact angle).