| 摘要 |
A hollow track body (21) comprises a plurality of rolling element travel sections (22) formed along the axial direction on the outer surface of a hollow shaft, and is supported by support bodies (31) via multiple rolling elements (40) capable of rolling along the plurality of rolling element travel sections (22). A rack tooth row (25) is formed in the axial direction by arc-shaped sections (21a, 21b) formed between the plurality of rolling element travel sections (22), the tooth base of said rack tooth row (25) penetrating into a hollow portion (21h) of the central shaft. |
