roller screws with no recirculation (RV and HRV types), inverted roller screws (RVI type), differential roller screws (RVD type) and screws with recirculating rollers (RVR type). Bearing units are also proposed to equip the different roller screw designs. The RV screw is a high precision, robust,
assembly where the rollers do not recirculate, thus enabling a very stable driving torque. Special gears are designed on the rollers and nut to maintain good kinematics even in the most severe conditions. The internal thread of the nut is identical to that of the screw. To ensure no axial movement occurs between the nut and the rollers, there is a single-start thread with precise angle accuracy between the nut and the rollers. The RVR roller screw is a design which
incorporates recirculating rollers. The rollers are guided within a cage and their motion is controlled by a set of cams. This design combines extremely high positioning accuracy, resolution and stiffness, while capacity ratings are at the highest thanks to a robust thread geometry. This concept is suitable for all applications that need a very high accuracy under small or moderate speeds. The RVI roller screw is an inverted roller
screw. Whilst it is based on the same principle as the RV design and delivers exactly the same level of operational performance, the rollers do not move axially along the shaft and stroke is travelled within a longer nut. This concept follows specific design rules which enable higher capacity ratings with smaller leads,
which consequently reduces the driving torque, optimises compactness and makes a direct guiding of the shaft possible. The RVD roller screw is ideally suited to
high precision applications when high accuracy is required. Its components are specifically designed and adjusted to allow extremely
thin leads down to 0.02mm. Shorter stroke applications are best suited to this type of roller screw. The HRV roller screw is designed for very
high load applications and for extended life. This design provides more contacts in the assembly than the RV type and has a different thread profile. The nuts are also longer than in the standard RV version. The HRV series is suitable for larger diameters and consequently the range is not available in split nut format or with internal preload. Only standard or reduced backlash options are available.
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