THK SSR20-XWSS THK LINEAR GUIDEWAY CARRIAGE
- Weight (g): 237,00
SSR series, Caged Ball LM Guide
Ball Cage Effect, Compact, Radial Type
Balls roll in four rows of raceways precision-ground on an LM rail and an LM block, and ball cages and endplates incorporated in the LM block allow the balls to circulate. Use of the ball cage eliminates friction between balls and increases grease retention, thus to achieve low noise, high speed and long-term maintenance-free operation.
Ball Cage Effect
The early forms of ball bearing were full-ball types without ball cages. Friction between balls caused loud noise, made high-speed rotation impossible and shortened the service life. Twenty years later, a Caged Ball design was developed for ball bearing. The new design enabled high-speed rotation at a low noise level, and extended the service life despite the reduced number of balls used. It marked a major development in the history of ball bearing.
Similarly, the quality of needle bearing was significantly improved by the caged needle structure. With cage-less, full-ball types of ball bearing, balls make metallic contact with one another and produce loud noise. In addition, they rotate in opposite directions, causing the sliding contact between two adjacent balls to occur at a speed twice the ball-spinning rate. It results in severe wear and shortens the service life.
In addition, without a cage, balls make point contact to increase bearing stress, thus facilitating breakage of the oil film. In contrast, each caged ball contacts the cage over a wide area. Therefore, the oil film does not break, the noise level is low and balls can rotate at a high speed, resulting in a long service life.
– Long Service Life and Long-term
– Maintenance-free Operation
– Superbly High Speed
– Low Noise, Acceptable Running Sound
– Smooth Motion
– Low Particle Generation