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The RVR Series of roller screws have recirculating rollers. The rollers are guided within a cage and their motion is controlled by a set of cams. The design allows extremely high positional accuracy and resolution whilst maintaining a high load capacity rating.
The RVR Series is ideal for applications that need very high positional accuracy at low to moderate speeds. It is available in single nut configuration, or a double or split nut configuration if internal preload is required.
The RVR satellite roller screws is designed for very fine threads and leads and are used where a high positioning precision is required in association with high stiffness and heavier axial loads. As the rollers are recycled after each of their revolutions, this design is not suitable for high speeds. The main elements of RVR satellite roller screws are the screw, the nut and the rollers which are guided and maintained at the correct distance in a cage. The screw has a single or two start thread with a triangular profile. The angle between the flanks is 90°. The nut has the same internal thread as the screw.
The rollers are not threaded but have grooves perpendicular to the screw axis. The distance between the grooves matches the exposed thread of the screw and nut. The flanks are convex and the angle between them is 90°. When the screw or nut rotates, the rollers are axially displaced in the nut. After a complete revolution, each roller is returned to its initial position by two cams at the end of each nut. They can be recycled this way because there is a groove the length of the nut. The cage pockets are slightly longer than the rollers to enable them to move axially within the nut.