High torque ball spline

High torque ball spline [model]: LBS, LBST, LBF, LBR, and LBH types
High torque ball spline
★ Structure and specialties
The high torque ball spline, as shown in Figure 1, has three rolling surface protrusions evenly arranged at 120 ° on the outer ring of the spline shaft, and is equipped with two rows (a total of six rows) of load-bearing steel balls to clamp it from the left and right sides.
The rolling surface is precision ground into an R-groove shape that is close to the diameter of the ball. When the spline shaft or spline nut is subjected to torque, three rows of steel balls in the same direction as the torque in the six rows of loaded steel balls equally bear the load and automatically determine the center of rotation. When reversing, the load is borne by three rows of steel balls in the opposite direction.
Each steel ball column continuously undergoes a complete cyclic motion through the retainer installed in the spline nut, so even if the spline shaft is pulled out of the spline nut, the steel balls will not fall off.
The clearance in the rotation direction is' zero '
The high torque ball spline applies pre pressure to a single spline nut, making the clearance in the rotation direction zero, thereby improving rigidity.
Like traditional ball splines with circular grooves or Gothic grooves, applying preload does not require twisting the two spline nuts in the circumferential direction before use, making it easy to achieve miniaturization design.
High rigidity and precise positioning
Due to the large contact angle and the ability to apply preload with just one spline nut, the initial displacement is small, allowing for high rigidity and precise positioning accuracy.
Capable of high-speed movement and high-speed rotation
Due to the low friction force, excellent lubricant retention structure, and rigid retainer, even high-speed linear motion can meet long-term usage needs under the action of grease.
In addition, due to the roughly equal radial distance between the loaded steel ball and the unloaded steel ball, even when rotating at high speed, the influence of centrifugal force acting on the steel ball is minimal, allowing for smooth and stable linear motion.
Small design
Unlike traditional ball splines, the outer diameter of the spline nut can be reduced by not allowing unloaded steel balls to circulate around the outer circumference, thus achieving a space saving and compact design.
Steel ball retaining type
Due to the use of a ball retainer, even if the spline shaft is extracted from the spline nut, the steel ball will not fall off.
Can be used as a linear bearing for heavy loads
Due to the processing of the rolling surface of the steel ball into an R groove shape roughly equal to the radius of the steel ball, the contact area of the steel ball is large, and it has strong bearing capacity even for radial loads.
One axis can be used instead of two parallel axes
Since one shaft can withstand loads in both the torque and radial directions, it is possible to replace the previous parallel use of two shafts with one shaft, thus achieving a simple installation and space saving design.
★ Purpose
High torque ball splines are widely used in the frame columns of industrial robots, as well as in robotic arms, automatic loading and unloading machines, conveyors, automatic handling devices, tire forming machines, spot welding machine spindles, high-speed automatic coating guide shafts, riveting machines, wire winding machines, discharge machining machine heads, grinding bed spindle drive shafts, various speed changing devices, precision indexing shafts, etc. It is a highly reliable linear motion system.