Heavy duty roller nut assembly for power drive applications

Abstract

A linear displacement device (1) is provided with a lead screw (24) having a helical threaded portion (74) and a roller nut assembly (10). The roller nut assembly (10) includes a housing (50) having openings (52, 54) for receiving the lead screw (24) therethrough. A pair of bearings (56, 58) are supported within said housing (50). The bearings (56, 58) each have an inner race (60), an outer race (62) and a plurality of balls (64) disposed between the inner and outer races (60, 62). A threaded member (66) is supported radially inward of said inner race (60). Threaded member (66) includes a plurality of concentric grooves (72) for engaging the flank (68, 72) of a helical threaded portion (74) of the lead screw (24) and a crest contacting portion (70) for engaging a crest (76) of the helical threaded portion (74) of the lead screw (24). A spring member (68) is provided for preloading the bearing (56, 58).

Dependencies are inferred from the claim text.