| 摘要 |
PROBLEM TO BE SOLVED: To provide an automobile ball screw with a compact circulation part and a piece member reliable on fixation to achieve lower cost and superior mass-productivity, wherein the circulation part is arranged in an improved isostatic and free fashion. SOLUTION: The ball screw 1 to be used for an automobile actuator comprises a screw stem 2, a nut 3, and a ball 6 laid between screw grooves 4, 5. The nut 3 has the piece member 7 as a component for circulating the ball 6. The piece member 7 is fitted to a fitting opening 8 formed in the nut 3 through its inside and outside faces. The piece member 7 has a pair of wing portions 10 for engaging with the screw groove 5 of the nut 3 and a pair of caulked portions 11 to be fixed to an outer diameter portion of the nut 3. The piece member 7 is formed of a sintered alloy manufactured in a metal injection molding method. COPYRIGHT: (C)2006,JPO&NCIPI
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