| 摘要 |
PURPOSE:To enhance strength of a spring member and reliability, by providing a spring member with an annular fixed part, elastic parts extended inwards on one side of longitudinal center axes of armatures, and mounting parts for mounting to the armatures, as one body. CONSTITUTION:A spring member 3 comprises an annular fixed part 3a, elastic parts 3b extended inwards on one side of longitudinal center axes of armatures 2, and mounting parts 3c for mounting to the armatures 2, as one body. The mounting part 3c is jointed to the armature 2 at weld points 14a, 14b. Since the elastic part 3b of the plate form spring member 3 is provided on only one side of the armature 2 at a boundary part between the mounting part 3c and the elastic part 3b, an arcuate part 3d having a large diameter can be provided. The arcuate parts 3d ensure a marked reduction in the stress in the spring member 3. |
