| 摘要 |
A plurality of roller shafts (31) are provided on one side of a timing chain (5) for torque transmission and spaced from each other in the longitudinal direction of guide bases (21) opposed to each other. The respective roller shafts (31) rotatably support a plurality of chain guiding rollers (41) in the form of needle roller bearings. The rollers (41) are formed into a cylindrical shape having the same diameter over the entire axial direction such that the rollers (41) are movable in the axial direction relative to the timing chain (5). The rollers (41) are supported so as to be movable in the axial direction of the roller shafts (31). When the rollers (41) and the timing chain (5) move relative to each other in the axial direction and the rollers (41) move relative to the roller shafts (31) in the axial direction, contact portions between the rollers (41) and the roller shafts (31) are displaced in the axial direction, so that radial loads are not locally applied. |
