| 摘要 |
PURPOSE: A supporting member is provided to enhance the contact with a contacting member and to prevent the member from spinning or being separated. CONSTITUTION: A supporting member comprises a plurality of protrusions(6). The protrusions are formed on the outer circumference of the supporting member when casting the supporting member. At least some of the protrusions have a slender waist shape. The height of the protrusions is 0.3-2.0mm. The number of the protrusions of within 1cm^2 is 5-100. |
