Anti-Friction Bearings (Ball and Roller Bearings)
Anti-Friction Bearings (Ball and Roller Bearings)

– [Jon] Hi, Jon here, in this video we’re going to be looking
at anti-friction bearings. By the end of the video, you’re going to know what an anti-friction bearing is as well as a rolling element bearing, a rolling bearing, and a
rolling contact bearing. You’re also going to know
what the two main categories of bearing are, what the main components of anti-friction bearings are, and how anti-friction bearings work. So let’s start with the basics. There are two main categories of bearings, anti-friction bearings and plain bearings. Now we’ll cover plain
bearings in a different video. Let’s focus on anti-friction bearings. Anti-friction bearings are also known as rolling contact bearings, rolling element bearings,
and rolling bearings. All of these names
refer to the same thing. These are just other names
for an anti-friction bearing. In order to keep things clear, we’re going to call them anti-friction bearings only. There are two main categories of anti-friction bearing, ball and roller. As the name implies, ball bearings use balls as rolling elements. Roller bearings use rollers
as rolling elements. In order to understand the difference between the two main types
of anti-friction bearing, we need to have a look at the construction of an anti-friction bearing. An anti-friction bearing consists of rolling elements, a separator, an inner ring, an outer ring, and sometimes a shield or a seal. You’re now looking at a cross
section of a ball bearing. Let’s take the bearing apart and look at each of its parts individually. This particular bearing uses
balls as the rolling elements. A separator is used to evenly space the rolling elements apart. The separator is also known
as the retainer or cage. Now that the rolling elements
are evenly spaced apart, we can view the final two pieces. The inner ring and the outer ring. One of the reasons that
learning about bearings is so confusing is because many of the components all have several names. An inner ring is also
known as an inner race. On tapered bearings it will
also be known as a cone. The outer ring is also
known as the outer race. On tapered bearings it’s
also called the cup. The separator is also known
as the retainer or cage. To recap, the balls
form the rolling element of a ball bearing for roller
antifriction bearings, the rolling elements may be cylindrical, barrel, tapered, or needle shaped. The separator is used to evenly space the rolling elements apart. The separator is also known
as the cage or retainer. The rolling elements
are sandwiched between an inner ring and an outer ring, also known as an inner race and outer race or for tapered bearings a cone and a cup. Some bearings may be
installed with a metal shield, which protects the bearing to some degree from foreign particle
ingress which may contaminate the lubricant inside the bearing. If the internals of the bearing must be completely
sealed from the outside, then a seal will be used
instead of a shield. Seals are usually manufactured
from rubber or Teflon. Seals completely seal the internal parts of the bearing which prevents foreign particle ingress
and moisture ingress. Sealed bearings are sealed for life. The lubricant housed within
the sealed area is used to lubricate the bearing until the bearing no longer functions or is replaced. Typical lubricants for
anti-friction bearings are grease and oil, grease contains oil although a thickening
agent is added to make the lubricant adhere to the
bearing’s internal surfaces. Thickening agents are usually
soap or non-soap based. When an anti-friction
bearing has no shield and no seal it is classed
as an open bearing. Most anti-friction bearings utilize one stationary ring and one rotating ring. The rotating ring is
usually the inner ring which is connected to a shaft. The stationary ring is
usually the outer ring. As the shaft rotates, the
inner ring also rotates as do the rolling elements. Notice that the movement of the shaft is not transferred to the stationary ring. So you’ve now learned
what the main two types of bearing are, anti-friction
and plain bearings. You also know what the main two categories of anti-friction bearings
are, ball and roller. We’ve discussed all of the main components of anti-friction bearings and how anti-friction bearings work. Please do be aware though
that there are different variations of every kind
of anti-friction bearing. Some anti-friction bearings
do not use an inner ring. Some anti-friction bearings
do not use a separator. If you’d like to learn why that is, then check out our
anti-friction bearings course. In the course we’ll discuss
ball anti-friction bearings as well as cylindrical roller bearings, tapered roller bearings,
needle roller bearings, and barrel roller bearings. The anti-friction bearings course is just one of many engineering courses. And if you’re a student,
you can access all of these engineering courses
for only 1999 a year. If you like this video then
please do like it or share it. It really does help us out and allows us to produce more and more content. And if you’ve got any
questions or comments, then just leave them in
the video description area and we will get back to
you as soon as possible. Thanks very much for your time. (gentle electronic music)

4 thoughts on “Anti-Friction Bearings (Ball and Roller Bearings)”

  1. saVRee 3D says:

    Got a question, comment, or suggestion for a future video? Then leave a comment below!

  2. Kevin Lueddeke says:

    Great presentation!

  3. moonlight uet says:

    Great work Sir . THANKS ALOT

  4. lemehdi leazad says:

    – Absolutely no one :
    – saVRee : BEEERINKSS

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