| 摘要 |
PROBLEM TO BE SOLVED: To provide a ball unit capable of reducing its noise, even in a metal unit having durability constituted of metallic large and small balls and a pedestal.SOLUTION: Since a unit of a pedestal 20, a receiving ball 18 and a main ball 12 is formed of a metallic body, the unit is constituted as a metallic unit having durability. The maximum limit value of a load is higher in the metallic unit than in a synthetic resin unit molded of a hard synthetic resin. That is, the metallic unit is hardly deformed since the durability is higher than the synthetic resin unit. A soundproof member 24 in a case 14 is arranged so as to surround the above-mentioned metallic unit. Thus, a sliding sound generated between the receiving balls circulating in rolling is maximally restrained. That is, since generation of the noise in the case is maximally restrained, the noise leaking to the outside of a ball unit is reduced, and the noise generated between the balls in the rolling can be blocked. |
