The SKR Model is faster, generates less noise and has a longer predicted service life than the conventional KR Model LM Actuator by the use of ball cages in the LM Guide units and the Ball Screw unit.
THK - SKR
Caged Ball LM Guide Actuator
Our Products: Linear Motion > Precision Stages > Screw-driven Actuators > Precision Rodless Actuators (Stages)
The SKR Model is faster, generates less noise and has a longer predicted service life than the conventional KR Model LM Actuator by the use of ball cages in the LM Guide units and the Ball Screw unit. It also features a 4-way equal load system and a u-shaped cross section to increase rigidity. Ball cages are used only for the LM guide section of models SKR20 and SKR26 and the ball screws are fitted with QZ lubricators.
The SKR LM guide actuator USES the ball cage technique and is a compact actuator that integrates an LM module and ball nut into the inner part of the LM rail in the form of a u-shaped cross section. In addition, compared with the traditional sk-type, the LM guide wire and the ball screw part using cage ball technology make the skr-type LM guide wire executive mechanism have the characteristics of higher speed, lower noise and longer maintenance free running time.
Early ball bearings were global types without ball retainers. Friction between balls produces noise, making high-speed spinning impossible and shortening life. Twenty years later, a caged ball design was developed. The new design makes high-speed rotations at low noise levels and extends service life, although reducing ball use. It marks a major development in the history of ball bearing.
In the same way, the caged needle structure also significantly improves the quality of the pin - holder. Adopt cage-free, global ball bearing, the ball will contact with each other metal, which will produce bigger noise. In addition, they rotate in opposite directions, causing sliding contact between two adjacent balls to occur at twice the speed of rotation. Serious wear and tear, short service life.
In addition, without a cage, the ball will contact the point, increasing the bearing stress, resulting in a rupture of the oil film. In contrast, the ball in each cage has a wide range of contact with the cage. Therefore, the oil film does not break, low noise, ball can spin at high speed, long service life.