| 摘要 |
PURPOSE: To suppress scattering of lubricant in a labyrinth part and to facilitate processing and assembling by forming lubricant standing part in the normal direction of annular projection parts of annular recessed parts of a fixed part and a turn table. CONSTITUTION: One annular projection part 1C1 with a square shape in section is projectedly formed on a chassis base 1, and an annular expanding part projecting in the central direction of a rotary shaft 3 is formed on its upper end part. On the other hand, the annular expanding part projecting in the central direction of the rotary shaft 3 is formed on a lower surface 4B side on the opposite side of the annular expanding part of the annular recessed part. In such a case, the annular expanding part becomes a nearly diagonal positional relation with the annular expanding part and spatial parts becoming a grease staying part (lubricant staying part) are respectively formed on surfaces along these expanding parts. Thus, a scattering prevention effect equal to or above as usual is obtained, and the assembling is facilitated. |
