Thrust bearings are used for carrying loads in axial direction. They are also referred to as axial bearings. Like radial bearings, a thrust bearing contains two race rings, a set of rolling elements, and, frequently a cage for retaining the rolling elements. A major distinction between an axial (thrust) bearing and a radial bearing is the arrangement of bearing race rings. In an axial bearing, the two race rings are arranged side-by-side in a parallel configuration along the axial direction. The rolling elements are sandwiched between the two race rings. According to the geometric...

Needle rollerbearing

Balls can be made of stainless steel, glass, acetal, ceramic, or polypropylene. In addition, the balls and races can be made of the same material or different materials. Typically, precision bearings for aerospace, aircraft and aviation use SAE 52100, 440C or 440C modified steel, CREN high nitrogen stainless steel, or M50. Hybrid bearings with ceramic elements for higher speeds and extended wear life are also used in demanding applications.

Angular contact ball bearings have inner and outer raceways that are displaced relative to each other in the direction of the bearing axis. This enables them to accommodate combined radial and axial loads.

Ball bearing

Ball bearings with precision levels less than ABEC 1 are considered to be unground bearings. Applications include ceiling fans, hoists, and trailer jacks – just to name a few. Semi-ground bearings are also available, but precision bearings meet at least ABEC level 3 . Precision bearings are more challenging to produce, but they support high accuracy, high rigidity, and high speeds.

Precision ball bearings include both angular contact bearings and deep groove bearings. Therefore, the definition of a precision bearing involves manufacturing. A ball bearing’s ABEC rating describes the level of manufacturing tolerances, or acceptable part-to-part variations. Bearings with lower ABEC ratings are less precise and bearings with higher ABEC ratings are more precise.

ballbearing中文

Department of Materials Science and Engineering and Center for Surface Engineering and Tribology, Northwestern University, Evanston, IL, USA

Bearing

Thrust bearings are designed and used to carry axial loads. They are also called axial bearings. These bearings include thrust ball bearings, thrust cylindrical roller bearings, thrust needle bearings, thrust tapered roller bearings, and thrust spherical roller bearings.

Schatz Bearing is ball bearing supplier that designs and manufactures products in an ISO 9001:2015 and AS9100 Rev. D certified facility in Poughkeepsie, New York (USA). We are also ITAR registered and can supply you with bearings that meet Boeing standards or MIL-SPEC standards.

Rollingbearing

Department of Mechanical Engineering and Center for Surface Engineering and Tribology, Northwestern University, Evanston, IL, USA

Thrustbearing

A ball bearing is a mechanical assembly that carries loads, reduces friction, supports positioning, and facilitates rotational and/or oscillatory motion. It is more than just than just a single BB-shaped ball.  Ball bearings can be manufactured with a higher or lower level of precision and are used in a variety of applications. Precision bearings are required by the aerospace, military and defense, medical, and semiconductor industries.

X. Ai, C.A. Moyer. Rolling element bearings. In: Bhushan, B. (ed.) Modern Tribology Handbook, vol. 2. CRC Press, Boca Raton (2001)

There are many different types of ball bearings, including various subtypes. The following is a partial list with some brief definitions and use cases.

Rolling elementbearing

Ball bearings have two ring-shaped races, or raceways, that hold the individual balls and transmit loads through them. These races provide a fixed path on which balls can roll and glide while generating little friction. Each race has a grooved surface, and some are grooved more deeply than others. The outer race contacts the outside of the balls, the inner race contacts the inside of the balls, and the balls remain between these two races.

Deep groove ball bearings can support heavy loads while offering both axial and radial support. The term “groove” refers to the depth of the raceway into which the balls fit.

Full complement bearings don’t have a cage. Instead, both rings have filling slots to allow the maximum number of balls to be installed in the bearings. This results in a much higher load-carrying capacity, but there are tradeoffs. For example, full complement bearings are used only in applications that have radial loads. In other words, they can’t support thrust or moment loads. Typically, full complement bearings are used in slower speed applications.

Ai, X. (2013). Thrust Bearings. In: Wang, Q.J., Chung, YW. (eds) Encyclopedia of Tribology. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-92897-5_333

A ball bearing retainer (also called a cage) is a separator that maintains the balls’ radial spacing from each other. Retainers can also provide lubrication by serving as a reservoir for oils or supplying a solid film. There are several common types of cages, including special cages for aircraft bearings. Prior to assembly, the retainers are cleaned carefully and then lubricated. With some precision bearings, military-grade greases are required.

In addition to materials of construction, ball bearings are specified by dimensions, rated speed, dynamic axial load, and dynamic radial load. Bore diameter, outside diameter, cross section and overall width are key dimensional specifications. With standard ball bearings, the cross section increases in proportion to the bore diameter. With thin section bearings, however, the cross-section dimension does not. In other words, the cross-section size remains the same even when the bore diameter increases.