To provide an outer tube for steering intermediate shaft, which comprises a solid male shank and a bottomed cylinder-shaped female cylindrical part, has a sufficient strength, and can sufficiently assure an axial direction length of an inner peripheral side engagement part, at low cost.SOLUTION: A solid columnar shank 58 is formed at an end part on one side in an axial direction of a columnar blank 51 by frontward extrusion molding, and a bottomed cylinder-shaped cylindrical part 59 having a bottomed hole 62 is integrally formed on the other side in the axial direction of the shank 58 by backward extrusion molding, thereby obtaining an intermediate blank 53. The cylindrical part 59 is restrained by a restraint die 66, and a punch 65 for formation of an inner peripheral groove, which is located on the other side in the axial direction of the intermediate blank 53, is inserted in the bottomed hole 62 in the state that a die 64 for formation of an outer peripheral groove on one side in the axial direction of the intermediate blank 53, thereby forming an inner peripheral side engagement part 28 on an inner peripheral surface of the cylindrical part 59, and the shank 58 is pushed inside the die 64 for formation of an outer peripheral groove, thereby forming an outer peripheral side engagement part 22 on an outer peripheral surface of the shank 58.SELECTED DRAWING: Figure 8
【課題】中実状の雄軸部と有底円筒状の雌筒部とを備え、十分な強度を有し、かつ、内周側係合部の軸方向長さを十分に確保できるステアリング中間シャフト用アウタチューブを、低コストで提供する。【解決手段】円柱状の素材51の軸方向一方側の端部に、前方押し出し成形により、中実円柱状の軸部58を形成するとともに、後方押し出し成形により、有底孔62を有する有底円筒状の筒部59を、軸部58の軸方向他方側に一体に形成して、中間素材53を得る。筒部59を拘束ダイス66により拘束し、中間素材53の軸方向一方側に外周溝成形用ダイス64を配置した状態で、中間素材53の軸方向他方側に配置した内周溝成形用パンチ65を有底孔62に挿入することで、筒部59の内周面に内周側係合部28を形成し、軸部58を外周溝成形用ダイス64の内側に押し込むことで、軸部58の外周面に外周側係合部22を形成する。【選択図】図8
OUTER TUBE FOR STEERING INTERMEDIATE SHAFT AND METHOD FOR MANUFACTURE THEREOF
ステアリング中間シャフト用アウタチューブ及びその製造方法
2021-03-18
Patent
Electronic Resource
Japanese
IPC: | B62D MOTOR VEHICLES , Motorfahrzeuge / B21J FORGING , Schmieden / B21K MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS , Herstellen von Schmiede- oder Presserzeugnissen aus Metall, z.B. Hufeisen, Nieten, Bolzen oder Rädern / F16C SHAFTS , Wellen / F16F SPRINGS , Federn |
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