| 摘要 |
PROBLEM TO BE SOLVED: To strengthen a plastic jointing part jointing split pieces to each other against coming-off. SOLUTION: This assembly type crank shaft 1 is integrally assembled by attaching a plurality of split pieces 2A-2I to one another at the plastic jointing parts 3. The plastic jointing part 3 includes an attachment hole part 8 formed on one side of the split pieces 2A-2I adjacent to each other, and an attachment shaft part 6 formed on the other side thereof; serrations comprising ridge parts and valley parts of the attachment shaft part 6 are formed in the outer periphery of the attachment shaft part 6; and the split pieces are plastically jointed to each other by pressing and attaching the attachment shaft part 6 in/to the attachment hole part 8. In the respective split pieces 2A-2I, lateral oil holes 10 and 11 are formed over the insides of the attachment shaft parts 6. In order to make the lateral oil holes 10 and 11 adjacent to each other communicate with each other, vertical oil holes 14 and 15 penetrating the attachment hole part 8 and the attachment shaft part 6 are formed. The vertical oil holes 10 and 11 are larger than the pitch of the valley parts. After machining the lateral oil holes 10 and 11 and the vertical oil holes 14 and 15, the attachment shaft parts 6 are pressed in the attachment hole parts 8 in order to attach the respective split pieces 2A-2I to one another. COPYRIGHT: (C)2009,JPO&INPIT
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