| 摘要 |
<p>A carriage comprising two spaced apart, adjacent and at least substantially parallel surfaces (2, 3), co-axial recesses (21) in said surfaces defining outer bearing races and which contain a ring of balls (23), and a rotary element (124, 224, 324, 424, 524) having an axis of rotational symmetry; which element being entirely supported by said balls against radial loads and wherein said element has portions (143, 343, 443) defining inner bearing races for said balls and a portion defining a surface (141, 241) for running along a track.</p> |
