| 摘要 |
A telescopic shaft (3) for vehicle steering includes: an inner shaft (10) and a tubular outer shaft (11) fitted with each other; at least three pairs of axial grooves (31,32,33,34,35,36) formed on an outer periphery (26) of the inner shaft (10) and an inner periphery (28) of the outer shaft (11); a rigid coupling element (25) for rigidly connecting the inner shaft (10) and the outer shaft (11) in a circumferential direction (C) of the inner shaft (10) when a relative phase of the inner shaft (10) and the outer shaft (11) with respect to the circumferential direction (C) exceeds a predetermined range; and a plurality of elongate resin rods (41,42,43;41J,42J,43J) as elastic coupling elements (41,42,43;41J,42J,43J) for elastically connecting the inner shaft (10) and the outer shaft (11) in the circumferential direction (C) when the relative phase is in the predetermined range. Each of the plural resin rods (41,42,43;41J,42J,43J) is formed with a groove (50). A section of the groove (50) is shaped like U opening toward the outside in a radial direction (U) of the inner shaft (10). |
