Ball Screw OFU & DFU
Internal Circulation, Flange, Double Nut Type
OFU & DFU series delivers high accuracy, no clearance and high rigidity. Internal circulation design saves more space, double nut design provides high load-carrying capacity, high stability and long service life.
OFU and DFU type ballscrew is belong to Internal Return Series, and it widely used in industrial area. OFU & DFU series delivers high accuracy, no clearance and high rigidity. Internal circulation design saves more space, double nut design provides high load-carrying capacity, high stability and long service life.
When making selection of series, please take demanded accuracy, intended delivery time, dimensions( the outside diameter of screw, ratio of lead/ the outside diameter of screw) preload and etc into consideration.
(2) Circulation type
Selection of circulation type : Please consider the efficiency of screw nut’s mounting space.
(3) Number of loop circuits
Performance and service life should be considered when selecting number of loop circuits.
(4) Shape of flanges (FLANGE)
Please make selection based on the available space for the installation of nuts.
(5) Oil hole
Oil hoIes are provided for the precision ball screws, please use them during machine assembling and regular furnishing.
A ball screw is a mechanical linear actuator that translates rotational motion to linear motion with little friction. A threaded shaft provides a helical raceway for ball bearings which act as a precision screw. As well as being able to apply or withstand high thrust loads, they can do so with minimum internal friction. They are made to close tolerances and are therefore suitable for use in situations in which high precision is necessary. The ball assembly acts as the nut while the threaded shaft is the screw. In contrast to conventional leadscrews, ballscrews tend to be rather bulky, due to the need to have a mechanism to re-circulate the balls.
Another form of linear actuator based on a rotating rod is the threadless ballscrew, a.k.a. “rolling ring drive”. In this design, three (or more) rolling-ring bearings are arranged symmetrically in a housing surrounding a smooth (thread-less) actuator rod or shaft. The bearings are set at an angle to the rod, and this angle determines the direction and rate of linear motion per revolution of the rod. An advantage of this design over the conventional ballscrew or leadscrew is the practical elimination of backlash and loading caused by preload nuts.