| 摘要 |
A cast aluminum base frame of a moveable guide for a timing chain in an internal combustion engine is produced in a die in which the parting line PL between die parts P1 and P2 is located so that the shoe-engaging surface 121 and the pivot shaft-receiving hole 122a of the base frame are each formed by continuous surfaces of die parts P1 and P2, without the presence of oppositely pitched drafts. This is achieved by employing a die having a die part P2 which has a continuous face against which all of the shoe engaging surface 121 of the base frame is cast and a die part P1 which has a protruding portion against which all of the pivot receiving hole 122a is cast. |
