Posts Tagged ‘types of bearings’

Types Of Bearings And How They Work

Friday, February 2nd, 2018

Bearings enable metal machinery parts to move smoothly and quietly, without the friction that can lead to the wearing out of these parts.

Without the use of bearings, we would be required to regularly replace parts when they get worn out. That would increase downtime, costs for parts, and efficiency.

In a nutshell, bearings make for less effort, easier movement, and reduced friction.

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Cost Considerations of Bearings

Friday, October 25th, 2013

When you deeply investigate and look into it, among the hindrances to rapid expansion of the market of ceramic bearings was the high cost of ceramics relative to steel. Truth be told, not too long ago, the price ratio between the two was more than 1000:1.

The price of steel balls has been constant, but the cost of ceramic balls has pretty much been plummeting. The reasons include enhancements in the manufacturing process and higher volumes.

The main costs linked to hydrostatic bearings are those of the fluid supply system, the expenses that come with machining every oil supply hole, and the cost of machining long straight rails or very round bores. The main cost in the air bearings are those of machining every air supply passage and machining long straight rails or very round bores with close tolerance.

Magnetic bearings may be the most expensive type of bearing there is.  Nevertheless, considering the problem they solve, effective system costs could be low compared to design solutions that make use of other bearings.

About Cylindrical Roller Bearings

Friday, August 16th, 2013

Cylindrical roller bearings come with rollers that give a modified line contact with the cylindrical inner and outer ring raceways, while the rollers are guided by ground ribs on either the inner or outer ring.

The cylindrical shape makes it possible for the the inner ring to have axial movement that is relative to the outer ring. This becomes particularly significant when dealing with thermal expansion, in which two of the rings should be press-fitted.

In this particular bearing type, the cylindrical rollers are in linear contact with the raceways. They possess a high radial load capacity and they’re ideal for high speeds.

There is a variety of types designated as NU, NJ, NUP, N, NF (for single-row bearings), NNU, and NN (for double-row bearings in accordance with the design or absence of side ribs). The outer and inner rings of every type is separable.

There are some cylindrical roller bearings that come with no ribs on both the inner and outer ring. That being said, the rings are able to move axially relative to one another. They could be used as free-end bearings.

Cylindrical roller bearings, where either the inner or outer rings possesses two ribs, and the other ring possesses one, can take some axial load in one direction. Double-row cylindrical roller bearings have high radial rigidity, and they’re mainly used for precision machine tools.

Generally, pressed steel or machined brass cages are utilized, but there are cases in which molded polyamide cages are employed.

Depending on the existence of ribs on their rings, Cylindrical Roller Bearings are categorized in these types:

Types NU, N, NNU, and NN are ideal for free-end bearings. Types NJ and NF are able to sustain limited axial loads in one direction. And you can use types NH and NUP as fixed-end bearings.

NH-type cylindrical roller bearings have the NJ-type cylindrical roller bearings and HJ-type L-shaped thrust collars. The inner ring loose rib of an NUP-type cylindrical roller bearing must be mounted in order for the marked side to be on the outside.

Ball Bearings

Friday, February 15th, 2013

A ball bearing refers to a specific type of rolling element bearing that uses balls, which is responsible for keeping the moving parts of a bearing separated. Such tools aid in minimizing the rotational friction, as well as the radial and axial loads. It is possible for ball bearings to achieve such with the help of at least two races, which have the balls and shift the loads through the balls. In some cases, one of the races is fastened into place.

The balls rotate as one of those races rotates. Considering the balls are rolling, they have a relatively lower coefficient of friction. The thing that lets them have a lower load capacity for their size is the small surface of the balls between the races. The production costs of ball bearings are quite inexpensive, making them the most affordable type of bearing.

Various types of ball bearing mechanisms are available in the market today, and they have their own different applications. Here is some of the terminology:

  • • Aircraft bearings: These are bearings that are utilized within the aircraft industry.
  • • Airframe bearings: This type of bearing is built for use in the control systems and surfaces of aircraft.
  • • Angular contact bearing: are designed such that there is an angle between the races and the balls when the bearing is in operation.
  • • Anti-friction bearing: A term used to describe bearing that makes use of rolling motion to support a load and reduce friction.
  • • Ball bearing: A bearing using balls as the rolling element. It is a specific type of anti-friction bearing that come with metal balls, giving rolling motion and lessening friction between moving parts.
  • • Ball cage: This refers to a device that partly surrounds the balls and travels with them.
  • • Ball complement: It is the number of balls utilized in a ball bearing.
  • • Cone: Inner ring of tapered roller bearing.
  • • Double row bearing: A type of roller-element bearing consisting of a double-row of rolling elements.

There are also many different uses for ball bearings, some of the common purposes are:

  • • Automobile wheels
  • • Bicycle wheels
  • • Dental equipment
  • • Machine tools including drills, lathes, milling machines, and others
  • • Washing machine drums

Come back to this site regularly to learn more about bearings.