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Super Precision Bearing

JTEKT continually offers the best technologies, quality, and services, through inspiration from the market and putting efforts into research and technical developments

JTEKT continually offers the best technologies, quality, and services, through inspiration from the market and putting efforts into research and technical developments. We offer a wide range of Koyo super precision ball bearings which are being used for the most demanding applications such as machine tools and ball screw shafts.

Our super precision ball bearings are well known for their high accuracy, speed and performance and are available in the following types:

  • Angular contact ball bearings
  • Cylindrical ball bearings
  • Tapered roller bearings
  • Support bearings for precision ball screws
  • Support bearing units for precision ball screws

Bearing 3D
FAQ

What is an angular contact ball bearing?

An angular contact ball bearing uses axially asymmetric races. An axial load passes in a straight line through the bearing, whereas a radial load takes an oblique path that tends to want to separate the races axially. So the angle of contact on the inner race is the same as that on the outer race. Angular contact bearings better support "combined loads" (loading in both the radial and axial directions) and the contact angle of the bearing should be matched to the relative proportions of each. The larger the contact angle (typically in the range 10 to 45 degrees), the higher the axial load supported, but the lower the radial load. In high speed applications, such as turbines, jet engines, and dentistry equipment, the centrifugal forces generated by the balls changes the contact angle at the inner and outer race. Ceramics such as silicon nitride are now regularly used in such applications due to their low density (40% of steel). These materials significantly reduce centrifugal force and function well in high temperature environments. They also tend to wear in a similar way to bearing steel—rather than cracking or shattering like glass or porcelain.

Most bicycles use angular-contact bearings in the headsets because the forces on these bearings are in both the radial and axial direction.

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