Page 2 of THK® rails and bearings by Techno Inc.

previous rfq page next index page home page introduction to the caged balltm concept when rotary ball bearings were originally introduced over 150 years ago they were not equipped with a cage this design resulted in high noise levels short service life and low maximum rotating speed consequently the cage was introduced into the bearing design resulting in low noise levels and high rotating speeds in addition the bearings equipped with the cage demonstrated long service life despite the reduced number of balls vs the full complement type rotary ball bearings with the cage evolved significantly over the years thus allowing for a wide range of applications 2 rails carriages and bearings the same cage concept would clearly work in linear ball bearings except for elliptical path of the balls inside the linear bearings being different from the circular path of the balls inside rotary bearings thus the metal cage employed by the rotary bearings could not have worked for the lm guides thk the first manufacturer in the world to develop the lm guide is also the first to introduce the lm guide that incorporates caged balltm technology this revolutionary lm guide is able to achieve a dramatic improvement in performance over conventional products it delivers long service life and excellent high-speed performance in the same manner as rotary bearings equipped with cage while eliminating maintenance for prolonged periods of time evolution of rotary bearings initial stage of development full complement of balls · · · · reduction of grease life short service life excessive heat generation ball collision noise current design with cage · · · · · excellent grease retention inside the cage extended service life low heat generation elimination of noise caused by metalto-metal contact between the balls smooth operation due to orderly ball movement advantages of caged balltm 1 excellent high-speed performance the use of ball cage eliminates generation of heat caused by friction between balls resulting in excellent high-speed performance 62 www.techno-isel.com

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