| 摘要 |
A linear displacement device (1) is provided with a lead screw (24) having a helical threaded portion (70) 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 spring (94) is disposed between the pair of bearings (56, 58), for biasing the bearings (56, 58) apart. The bearings (56, 58) are provided with a flank engaging portion (66) for engaging the flank (68, 72) of a helical threaded portion (70) of the lead screw (24) and a crest contacting portion (74) for engaging a crest (76) of the helical threaded portion (70) of the lead screw (24). |
